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Sample records for balloon kyphoplasty performed

  1. Combined CT and fluoroscopic guidance of balloon kyphoplasty versus fluoroscopy-only procedures

    Energy Technology Data Exchange (ETDEWEB)

    Amoretti, Nicolas; Marcy, Pierre-Yves; Lesbats-Jacquot, Virginie; Fonquerne, Marie-Eve; Hericord, Olivier; Maratos, Yvonne [Centre Hospitalier Universitaire de Nice, Service de Radiologie, Nice (France); Hovorka, Istvan [Centre Hospitalier Universitaire de Nice, Spine Surgery Department, Nice (France); Roux, Christian; Euller-Ziegler, Liana [Centre Hospitalier Universitaire de Nice, Rheumatology Department, Nice (France)

    2009-07-15

    To evaluate the performance of combined (computed tomography (CT) and fluoroscopic) guidance of balloon kyphoplasty in comparison to fluoroscopic guidance alone. Forty-one kyphoplasties were performed between January 2005 and March 2006 according to two different protocols. Study group 1 consisted of 20 consecutive patients with 20 balloon kyphoplasty procedures under dual guidance (CT scan and fluoroscopy) for osteoporotic or traumatic vertebral fractures. Study group 2 consisted of 21 consecutive patients in whom kyphoplasty was performed with fluoroscopy alone. Visualization of the pedicles, the final of the balloon position, and cement distribution were evaluated(1 - poor, 2 - intermediate, 3 - good). Combined use of CT and fluoroscopy (group 1) was superior in identifying the pedicles (100% versus 66.7%, p = 0.009) and balloon placement (100% versus 71.4%, p = 0.02) but not in monitoring of cement distribution within the vertebral body (100% versus 90.5%, p = 0.49). The difference between the two groups was more pronounced in the thoracic spine than in the lumbar spine. CT/fluoroscopic guidance of kyphoplasty combines safe CT-guided insertion of the osteointroducers and balloons as well as fluoroscopic real-time monitoring of polymethylmethacrylate injection. (orig.)

  2. Refracture of osteoporotic vertebral body after treatment by balloon kyphoplasty

    Science.gov (United States)

    Li, Xigong; Lu, Yang; Lin, Xiangjin

    2017-01-01

    Abstract Rationale: Balloon kyphoplasty is a widely accepted treatment of osteoporotic vertebral compression fractures (OVCFs) with good results and a low risk for complications. A refracture of previously treated vertebra is a relatively rare condition. Patient concerns: We reported our 3 cases and reviewed all relevant literatures of 11 cases with refracture of osteoporotic vertebral body after kyphoplasty. Diagnoses: Follow-up radiographs or magnetic resonance imaging examination confirmed refractures of previously treated vertebrae after kyphoplasty. Interventions: One patient with 1 refracture of osteoporotic vertebral body after kyphoplasty was treated conservatively, but the other 2 patients were treated surgically because of multiple vertebral fractures or neurological deficits. Outcomes: The average age of the patients was 76.8 years (range, 63–86 years). All the patients had severe osteoporosis with a mean T-score of −3.46 (range −5.0 to −3.0). The sites of refractures are in the lumbar and thoracolumbar regions. Severe osteoporosis, the presence of intravertebral cleft, and a solid lump injection pattern of polymethylmethacrylate would result in insufficient strengthening effects of cement augmentation and therefore increased the likelihood of refractures of the kyphoplasty vertibrae. Lessons: Patients with OVCFs and intravertebral cleft who did not obtain complete pain-relief at the treated vertebral level after kyphoplasty should be strictly followed up. Early finding of this condition and rapid intervention might contribute to avoiding the occurrence of the cemented vertebral refracture after kyphoplasty. Conservative treatments such as back brace and antiosteoporotic medications were strongly recommended. PMID:29245267

  3. [MDCT after balloon kyphoplasty: analysis of vertebral body architecture one year after treatment of osteoporotic fractures].

    Science.gov (United States)

    Röhrl, B; Sadick, M; Brocker, K; Brade, J; Voggenreiter, G; Obertacke, U; Düber, C

    2006-08-01

    To evaluate the value of MDCT in the monitoring of vertebral body architecture after balloon kyphoplasty and observe morphological changes of the vertebral body. During a period of 26 months, 66 osteoporotic fractures of the vertebral bodies were treated with percutanous balloon kyphoplasty. The height of the vertebral body, width of spinal space, sagittal indices, kyphosis und COBB angle, and cement leakage were evaluated by computed tomography before and after treatment and in a long-term follow up. Statistical analysis was performed by calculating quantitative constant parameters of descriptive key data. In addition, parametric and distribution-free procedures were performed for all questions. After kyphoplasty, the treated vertebral bodies showed a significant gain in the height of the leading edge (0.15 cm; p architecture after treatment with balloon kyphoplasty. Morphological changes in the vertebral bodies, and complications such as pallacos leakage and progression of osteoprosis can be accurately documented. The significant increase in the vertebral body height after treatment is closely correlated with a gain in the sagittal index and reduced kyphosis and COBB angle.

  4. Lateral wedging of the cemented vertebra after balloon kyphoplasty: a case report

    OpenAIRE

    Wang, Heng; Sun, Zhenzhong; Nitesh, Joshi; Yang, Huilin; Jiang, Weimin

    2015-01-01

    Balloon kyphoplasty has been shown to be safe in treatment of vertebral compression fractures refractory to conservative management. However, few reports have focused on lateral wedging of cemented vertebra after kyphoplasty. A 72-year-old woman with a T12 osteoporotic compression fracture underwent kyphoplasty using polymethylmethacrylate (PMMA) via a bipedicular approach. The patient felt pain free, whereas she did not receive anti-osteoporosis treatment after the surgery. The abnormal spat...

  5. Venous air embolism in consecutive balloon kyphoplasties visualised on CT imaging

    Energy Technology Data Exchange (ETDEWEB)

    Tins, Bernhard J.; Cassar-Pullicino, Victor N.; Lalam, Radhesh; Haddaway, Mike [Robert Jones and Agnes Hunt Orthopaedic Hospital, Department of Radiology, Oswestry, Shropshire (United Kingdom)

    2012-09-15

    We noted a large amount of intravenous gas during balloon kyphoplasty on CT imaging. Formal assessment to understand the extent, possible causes and implications was undertaken. Ten consecutive cases of balloon kyphoplasty were performed under general anaesthesia in the prone position, on a single vertebral level using a two-step technique under combined fluoroscopic and CT guidance. CT of the affected vertebra was performed before, after, and intermittently during the procedure. In 2 cases delayed CT was carried out in the supine position. Gas was seen on CT imaging, but not on conventional fluoroscopy. The gas is most likely to be air introduced during the procedure and was seen in the epidural and paravertebral venous plexus, posterior intercostal veins, renal veins, IVC and azygos vein. The average measured volume of gas seen on the post-procedure CT imaging was 1.07 mL, range 0.16-3.97 mL. There was no correlation of the measured amount of gas to the procedure duration or location, the use of a curette or the injected cement volume. Delayed CT in the supine position no longer showed air in the local venous system. Balloon kyphoplasty is associated with the fluoroscopically invisible introduction of air into the vertebral and paravertebral veins and deep systemic veins and is likely to be much more extensive than identified on CT imaging. There is potential for serious air embolism in kyphoplasty and if there is a sudden deterioration in patient condition during the procedure the possibility of this complication needs to be considered. (orig.)

  6. MDCT after balloon kyphoplasty: analysis of vertebral body architecture one year after treatment of osteoporotic fractures

    International Nuclear Information System (INIS)

    Roehrl, B.; Dueber, C.; Sadick, M.; Brocker, K.; Voggenreiter, G.; Obertacke, U.; Brade, J.

    2006-01-01

    Purpose: to evaluate the value of MDCT in the monitoring of vertebral body architecture after balloon kyphoplasty and observe morphological changes of the vertebral body. Material and methods: during a period of 26 months, 66 osteoporotic fractures of the vertebral bodies were treated with percutanous balloon kyphoplasty. The height of the vertebral body, width of spinal space, sagittal indices, kyphosis und COBB angle, and cement leakage were evaluated by computed tomography before and after treatment and in a long-term follow up. Statistical analysis was performed by calculating quantitative constant parameters of descriptive key data. In addition, parametric and distribution-free procedures were performed for all questions. Results: after kyphoplasty, the treated vertebral bodies showed a significant gain in the height of the leading edge (0.15 cm; p < 0.0001) and in the central part of the vertebral body (0.17 cm; p < 0.0001). The height of the trailing edge did not change significantly. A corresponding gain in the sagittal index was found. The index remained stable during follow-up. Treated vertebral bodies as well as untreated references showed a comparable loss of height over the period of one year. The shape of the vertebral bodies remained stable. In comparison to these findings, treated vertebral bodies showed a reduced loss of height. A significant change in kyphosis und the COBB angle was noted. In total, pallacos leakage was detected in 71% of cases. Conclusion: MDCT is an accurate method for evaluating vertebral body architecture after treatment with balloon kyphoplasty. (orig.)

  7. Balloon kyphoplasty for aged osteoporotic vertebral compressive fractures using instruments made in China

    International Nuclear Information System (INIS)

    Sun Gang; Jin Peng; Yi Yuhai; Xie Zhiyong; Zhang Kangli; Zhang Xuping

    2006-01-01

    Objective: To evaluated the efficacy and safety of balloon kyphoplasty in treatment of painful osteoporosis vertebral compressive fractures using instruments made in China. Methods: Sixteen cases of painful osteoporotic vertebral compressive fractures, involved 19 vertebrae. Under X-ray fluoroscopy monitoring, the inflatable balloon were inserted into the fractured vertebral body via transpedieular route bilaterally. The balloon was inflated with injected contrast agent, restored vertebral height and formed a cavity within vertebral body. The cavity was than filled with bone cement in toothpaste period. The postoperative symptoms and the radiographic finding of vertebral height were observed. Results: Balloon kyphoplasty was successful in all 16 cases with dramatic pain relief within 48 hours after the procedure. No clinical complication was found. The posttreatment mean anterior and mid portion of the vertebral body heights were (10.7±3.5) mm and (5.4±2.7) mm respectively, while that of the pretreatment were (14.8±4.1) mm and (10.4±4.4) mm, respectively (t=3.96, 5.37; P<0.01). Before the procedure, the mean Kyphosis was (22.4±5.8) degree, after the procedure, the mean kyphosis was measured (12.1± 5.3) degree (t=5.93, P<0.01). Leakage of a small quantity of bone cement occurred at one level. Conclusion: kyphoplasty using instruments made in China for painful osteoporotic vertebral compressive fractures was effective and safe. (authors)

  8. Optimal patient positioning for ligamentotaxis during balloon kyphoplasty of the thoracolumbar and lumbar spine.

    LENUS (Irish Health Repository)

    Cawley, D T

    2011-06-01

    Percutaneous balloon kyphoplasty aims to restore vertebral height, correct angular deformity and stabilize the spine in the setting of vertebral compression fractures. The patient is positioned prone with supports under the iliac crests and upper thorax to allow gravity to extend the spine. In the treatment of lumbar fractures, we evaluated patient positioning with the contribution of hip extension to increase anterior ligamentotaxis, thus facilitating restoration of vertebral height. Our positioning technique created a mean anterior height increase from 72% to 78% of the average height of the cranial and caudal vertebrae (p=0.037). Balloon inflation did not significantly further increase anterior or posterior vertebral height, or Cobb angle.

  9. Is balloon kyphoplasty better than percutaneous vertebroplasty for osteoporotic vertebral biconcave-shaped fractures?

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    Gan, Minfeng; Zou, Jun; Song, Dawei; Zhu, Xuesong; Wang, Genlin; Yang, Huilin

    2014-10-01

    Osteoporotic vertebral biconcave-shaped fractures are not commonly seen in clinical practice. Some articles have been published showing the outcome of vertebroplasty (PV) and balloon kyphoplasty (BKP), but few comparative studies have been performed. To compare the effect and safety of PV and BKP in treating osteoporotic vertebral biconcave-shaped fractures. In this retrospective comparative study, 38 patients with osteoporotic vertebral biconcave-shaped fractures were treated by PV, and 41 patients were treated by BKP from May 2005 to July 2011. The heights of the compromised vertebral body and the kyphotic angles were measured. Visual analogue scale (VAS) and Oswestry Disability Index (ODI) were used to evaluate pain and functional activity, respectively. The occurrence of refracture and cement leakage were determined, and the costs were recorded. The mean VAS and ODI scores significantly improved for both procedures at postsurgical measurements (P osteoporotic vertebral fractures in the PV group and two in the BKP group during the follow-up period. The mean cost in the BKP group (6200 ± 122.1 USD) was higher than the PV group (2100 ± 112.5 USD) (P osteoporotic vertebral biconcave-shaped fractures. BKP had a significant advantage over PV in terms of the restoration of the middle vertebral height and fewer cement leakages than PV. © The Foundation Acta Radiologica 2013 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

  10. Treatment of pathologic spinal fractures with combined radiofrequency ablation and balloon kyphoplasty

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    Tzanakakis George

    2009-11-01

    Full Text Available Abstract Background In oncologic patients with metastatic spinal disease, the ideal treatment should be well tolerated, relieve the pain, and preserve or restore the neurological function. The combination of fluoroscopic guided radiofrequency ablation (RFA and kyphoplasty may fulfill these criteria. Methods We describe three pathological vertebral fractures treated with a combination of fluoroscopic guided RFA and kyphoplasty in one session: a 62-year-old man suffering from a painful L4 pathological fracture due to a plasmocytoma, a 68-year-old man with a T12 pathological fracture from metastatic hepatocellular carcinoma, and a 71-year-old man with a Th12 and L1 pathological fracture from multiple myeloma. Results The choice of patients was carried out according to the classification of Tomita. Visual analog score (VAS and Oswestry disability index (ODI were used for the evaluation of the functional outcomes. The treatment was successful in all patients and no complications were reported. The mean follow-up was 6 months. Marked pain relief and functional restoration was observed. Conclusion In our experience the treatment of pathologic spinal fractures with combined radiofrequency ablation and balloon kyphoplasty is safe and effective for immediate pain relief in painful spinal lesions in neurologically intact patients.

  11. Balloon Kyphoplasty for Refractory Vertebral Compression Fractures in a Growing Child With Duchenne Muscular Dystrophy With Five-Year Follow-Up: Case Report and Review of Literature.

    Science.gov (United States)

    Duncan, Jan William; Bailey, Richard Anthony

    2014-03-01

    Presentation of previously unreported results and 5-year follow-up of balloon kyphoplasty used to treat an 8-year-old patient with refractory vertebral compression fractures resulting from 3 years of corticosteroid treatment for Duchenne muscular dystrophy. Long-term corticosteroid treatment in patients with DMD has been used to try and improve muscle strength, prolong ambulation, and lower the prevalence of scoliosis. However, these patients have an increased risk of osteoporosis and vertebral fractures. The patient was an 8-year-old boy with Duchenne muscular dystrophy who had received corticosteroid treatment for 3 years, with refractory vertebral compression fractures at T11, L1, and L3. Balloon kyphoplasty was performed at the 3 vertebral bodies using careful technique. The patient achieved immediate pain relief after the procedure. The height of the treated vertebrae remained stable without further collapse over a 5-year follow-up period. At 5-year follow-up, the patient developed 2 new vertebral compression fractures at T12 and L2 adjacent to the treated vertebrae. The treatment also did not affect the growth of the treated vertebrae or the patient's overall growth. Because the procedure resulted in rapid stabilization of the treated vertebrae, effective analgesia, and no effect on the growth of the treated vertebrae over a 5-year follow-up period, balloon kyphoplasty was a good therapeutic option for this pediatric patient. Copyright © 2014 Scoliosis Research Society. Published by Elsevier Inc. All rights reserved.

  12. Does Balloon Kyphoplasty Deliver More Cement Safely into Osteoporotic Vertebrae with Compression Fractures Compared with Vertebroplasty? A Study in Vertebral Analogues

    Science.gov (United States)

    Abduljabbar, Fahad H.; Al-jurayyan, Abdulaziz; Alqahtani, Saad; Sardar, Zeeshan M.; Saluja, Rajeet Singh; Ouellet, Jean; Weber, Michael; Steffen, Thomas; Beckman, Lorne; Jarzem, Peter

    2015-01-01

    Study Design A biomechanical and radiographic study using vertebral analogues. Objectives Kyphoplasty and vertebroplasty are widely used techniques to alleviate pain in fractures secondary to osteoporosis. However, cement leakage toward vital structures like the spinal cord can be a major source of morbidity and even mortality. We define safe cement injection as the volume of the cement injected into a vertebra before the cement leakage occurs. Our objective is to compare the amount of cement that can be safely injected into an osteoporotic vertebra with simulated compression fracture using either vertebroplasty or balloon kyphoplasty techniques. Methods Forty artificial vertebral analogues made of polyurethane with osteoporotic cancellous matrix representing the L3 vertebrae were used for this study and were divided into four groups of 10 vertebrae each. The four groups tested were: low-viscosity cement injected using vertebroplasty, high-viscosity cement injected using vertebroplasty, low-viscosity cement injected using balloon kyphoplasty, and high-viscosity cement injected using balloon kyphoplasty. The procedures were performed under fluoroscopic guidance. The injection was stopped when the cement started protruding from the created vascular channel in the osteoporotic vertebral fracture model. The main outcome measured was the volume of the cement injected safely into a vertebra before leakage through the posterior vascular channel. Results The highest volume of the cement injected was in the vertebroplasty group using high-viscosity cement, which was almost twice the injected volume in the other three groups. One-way analysis of variance comparing the four groups showed a statistically significant difference (p osteoporotic vertebrae with compression fractures. PMID:26225279

  13. Balloon kyphoplasty in malignant spinal fractures: a systematic review and meta-analysis

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    Saz-Parkinson Zuleika

    2009-09-01

    Full Text Available Abstract Background Spinal fractures are a common source of morbidity in cancer patients. Balloon Kyphoplasty (BKP is a minimally invasive procedure designed to stabilize fractures and correct vertebral deformities. We performed a meta-analysis to determine the efficacy and safety of BKP for spinal fractures in cancer patients. Methods We searched several electronic databases up to September 2008 and the reference lists of relevant publications for studies reporting on BKP in patients with spinal fractures secondary to osteolytic metastasis and multiple myeloma. Outcomes sought included pain relief, functional capacity, quality of life, vertebral height, kyphotic angle and adverse events. Studies were assessed for methodological bias, and estimates of effect were calculated using a random-effects model. Potential reasons for heterogeneity were explored. Results The literature search revealed seven relevant studies published from 2003 to 2008, none of which were randomized trials. Analysis of those studies indicated that BKP resulted in less pain and better functional outcomes, and that these effects were maintained up to 2 years post-procedure. While BKP also improved early vertebral height loss and spinal deformity, these effects were not long-term. No serious procedure-related complications were described. Clinically asymptomatic cement leakage occurred in 6% of all treated levels, and new vertebral fractures in 10% of patients. While there is a lack of studies comparing BKP to other interventions, some data suggested that BKP provided similar pain relief as vertebroplasty and a lower cement leakage rate. Conclusion It appears that there is level III evidence showing BKP is a well-tolerated, relatively safe and effective technique that provides early pain relief and improved functional outcomes in patients with painful neoplastic spinal fractures. BKP also provided long-term benefits in terms of pain and disability. However, the methodological

  14. Current concepts of percutaneous balloon kyphoplasty for the treatment of osteoporotic vertebral compression fractures: evidence-based review.

    Science.gov (United States)

    Hsieh, Ming-Kai; Chen, Lih-Huei; Chen, Wen-Jer

    2013-01-01

    Vertebral compression fractures constitute a major health care problem, not only because of their high incidence but also due to both direct and indirect consequences on health-related quality of life and health care expenditures. The mainstay of management for symptomatic vertebral compression fractures is targeted medical therapy, including analgesics, bed rest, external fixation, and rehabilitation. However, anti-inflammatory drugs and certain types of analgesics can be poorly tolerated by elderly patients, and surgical fixation often fails due to the poor quality of osteoporotic bone. Balloon kyphoplasty and vertebroplasty are two minimally invasive percutaneous surgical approaches that have recently been developed for the management of symptomatic vertebral compression fractures. The purpose of this study was to perform a comprehensive review of the literature and conduct a meta-analysis to compare clinical outcomes of pain relief and function, radiographic outcomes of the restoration of anterior vertebral height and kyphotic angles, and subsequent complications associated with these two techniques.

  15. Current concepts of percutaneous balloon kyphoplasty for the treatment of osteoporotic vertebral compression fractures: Evidence-based review

    Directory of Open Access Journals (Sweden)

    Ming-Kai Hsieh

    2013-08-01

    Full Text Available Vertebral compression fractures constitute a major health care problem, not only because of their high incidence but also due to both direct and indirect consequences on health-related quality of life and health care expenditures. The mainstay of management for symptomatic vertebral compression fractures is targeted medical therapy, including analgesics, bed rest, external fixation, and rehabilitation. However, anti-inflammatory drugs and certain types of analgesics can be poorly tolerated by elderly patients, and surgical fixation often fails due to the poor quality of osteoporotic bone. Balloon kyphoplasty and vertebroplasty are two minimally invasive percutaneous surgical approaches that have recently been developed for the management of symptomatic vertebral compression fractures. The purpose of this study was to perform a comprehensive review of the literature and conduct a meta-analysis to compare clinical outcomes of pain relief and function, radiographic outcomes of the restoration of anterior vertebral height and kyphotic angles, and subsequent complications associated with these two techniques.

  16. Minimum cement volume required in vertebral body augmentation--A biomechanical study comparing the permanent SpineJack device and balloon kyphoplasty in traumatic fracture.

    Science.gov (United States)

    Rotter, Robert; Schmitt, Lena; Gierer, Philip; Schmitz, Klaus-Peter; Noriega, David; Mittlmeier, Thomas; Meeder, Peter-J; Martin, Heiner

    2015-08-01

    Minimally invasive treatment of vertebral fractures is basically characterized by cement augmentation. Using the combination of a permanent implant plus cement, it is now conceivable that the amount of cement can be reduced and so this augmentation could be an attractive opportunity for use in traumatic fractures in young and middle-aged patients. The objective of this study was to determine the smallest volume of cement necessary to stabilize fractured vertebrae comparing the SpineJack system to the gold standard, balloon kyphoplasty. 36 fresh frozen human cadaveric vertebral bodies (T11-L3) were utilized. After creating typical compression wedge fractures (AO A1.2.1), the vertebral bodies were reduced by SpineJack (n=18) or kyphoplasty (n=18) under preload (100N). Subsequently, different amounts of bone cement (10%, 16% or 30% of the vertebral body volume) were inserted. Finally, static and dynamic biomechanical tests were performed. Following augmentation and fatigue tests, vertebrae treated with SpineJack did not show any significant loss of intraoperative height gain, in contrast to kyphoplasty. In the 10% and 16%-group the height restoration expressed as a percentage of the initial height was significantly increased with the SpineJack (>300%). Intraoperative SpineJack could preserve the maximum height gain (mean 1% height loss) better than kyphoplasty (mean 16% height loss). In traumatic wedge fractures it is possible to reduce the amount of cement to 10% of the vertebral body volume when SpineJack is used without compromising the reposition height after reduction, in contrast to kyphoplasty that needs a 30% cement volume. Copyright © 2015 Elsevier Ltd. All rights reserved.

  17. Bone cements for percutaneous vertebroplasty and balloon kyphoplasty: Current status and future developments

    Directory of Open Access Journals (Sweden)

    Zhiwei He

    2015-01-01

    Full Text Available Osteoporotic vertebral compression fractures (OVCFs have gradually evolved into a serious health care problem globally. In order to reduce the morbidity of OVCF patients and improve their life quality, two minimally invasive surgery procedures, vertebroplasty (VP and balloon kyphoplasty (BKP, have been developed. Both VP and BKP require the injection of bone cement into the vertebrae of patients to stabilize fractured vertebra. As such, bone cement as the filling material plays an essential role in the effectiveness of these treatments. In this review article, we summarize the bone cements that are currently available in the market and those still under development. Two major categories of bone cements, nondegradable acrylic bone cements (ABCs and degradable calcium phosphate cements (CPCs, are introduced in detail. We also provide our perspectives on the future development of bone cements for VP and BKP.

  18. Comparison of radiological and clinical results of balloon kyphoplasty according to anterior height loss in the osteoporotic vertebral fracture.

    Science.gov (United States)

    Lee, Jae Hyup; Lee, Dong-Oh; Lee, Ji-Ho; Lee, Hyeong-Seok

    2014-10-01

    Percutaneous kyphoplasty is effective for pain reduction and vertebral height restoration in patients with osteoporotic vertebral fractures. However, in cases of severely collapsed fractures involving the loss of more than 70% of the vertebral height, kyphoplasty is technically difficult to perform and the outcomes remain unknown. To compare the vertebral height restoration rate, kyphotic angle, and clinical results of patients who underwent kyphoplasty according to the degree of anterior vertebral height loss. In addition, to determine the feasibility and effects of kyphoplasty on severely collapsed osteoporotic vertebral fractures. A retrospective study. A total of 129 patients (145 vertebrae) who underwent kyphoplasty for osteoporotic painful vertebral fracture and followed up for more than 1 year between September 2005 and August 2012 were recruited for the analysis. The patients' kyphotic angle, anterior vertebral height, and anterior vertebral height restoration ratio 1 year after surgery were compared. Pre- and postoperative pain around the fractured vertebra and the radiological and clinical results according to bone mineral density (BMD) were also compared. Patients were divided into three groups for comparison, according to radiographic findings. Patients with an anterior height compression ratio more than 70% at the time of fracture comprised Group I, patients with a compression ratio of 50-70% comprised Group II, and those with a compression ratio of 30-50% comprised Group III. Group I showed a greater extent of anterior height restoration immediately after surgery compared with the other groups, which noticeably decreased over time. All three groups showed significant restoration of the anterior vertebral height between pre- and postoperative values. The anterior vertebral height 1 year after surgery did not differ between Group I and Group II but was significantly higher in Group III. There was no correlation between the BMD and restoration or

  19. Safety and clinical performance of kyphoplasty and SpineJack(®) procedures in the treatment of osteoporotic vertebral compression fractures: a pilot, monocentric, investigator-initiated study.

    Science.gov (United States)

    Noriega, D C; Ramajo, R H; Lite, I S; Toribio, B; Corredera, R; Ardura, F; Krüger, A

    2016-06-01

    Clinical performance and safety of two percutaneous vertebral cement augmentation (VA) procedures (SpineJack® and Kyphx Xpander® balloon) were compared in patients with osteoporotic compression fractures. Both techniques were safe, efficient, and led to a rapid and marked improvement in clinical signs; nevertheless, SpineJack showed better restoration of vertebral heights and angles, maintained over time. In patients with osteoporotic vertebral compression fractures (VCFs), both SpineJack® (SJ) and balloon kyphoplasty (BKP) led to a rapid and marked improvement in clinical signs. This pilot, monocentric, investigator-initiated, prospective study aimed to compare two percutaneous vertebral augmentation procedures in the painful osteoporotic VCF treatment. Thirty patients were randomized to receive SJ (n = 15) or BKP (n = 15). Analgesic consumption, back pain intensity (visual analog scale (VAS)), and Oswestry Disability Index (ODI) scores were recorded preoperatively, at 5 days and 1, 3, 6, and 12 months post-surgery. Quality of life (EQ-VAS score) was evaluated at 1, 3, 6, and 12 months. Spine X-rays were taken 48 h prior to procedure and 5 days and 6 and 12 months after. SpineJack® led to a significantly shorter intervention period (23 vs 32 min; p SpineJack® procedure has a higher potential for vertebral body height restoration and maintenance over time.

  20. Performance of the EUSO-Balloon electronics

    International Nuclear Information System (INIS)

    Barrillon, P.; Dagoret, S.; Miyamoto, H.; Moretto, C.; Bacholle, S.; Blaksley, C; Gorodetzky, P.; Jung, A.; Prévôt, G.; Prat, P.; Bayer, J.; Blin, S.; Taille, C. De La; Cafagna, F.; Fornaro, C.; Karczmarczyk, J.; Tanco, G. Medina; Osteria, G.; Perfetto, F.; Park, I.

    2016-01-01

    The 24th of August 2014, the EUSO-Balloon instrument went for a night flight for several hours, 40 km above Timmins (Canada) balloon launching site, concretizing the hard work of an important part of the JEM-EUSO collaboration started 3 years before. This instrument consists of a telescope made of two lenses and a complex electronic chain divided in two main sub-systems: the PDM (Photo Detector Module) and the DP (Data Processor). Each of them is made of several innovative elements developed and tested in a short time. This paper presents their performances before and during the flight

  1. Kyphoplasty for Intractable Pain Due to Glucocorticosteroid-induced Osteoporotic Vertebra Fracture of a 9-Year-Old Patient With Systemic Lupus Erythematosus: 8-Year Follow-up.

    Science.gov (United States)

    Kanatli, Ulunay; Ataoğlu, Baybars; Özer, Mustafa; Şenköylü, Alpaslan; Çetinkaya, Mehmet

    2015-09-01

    The incidence of glucocorticoid-induced osteoporosis is approximately 50% in patients treated for >6 months, and in the long-term usage fracture risk is approximately 34%. The awareness of pediatric vertebral fractures due to glucocorticoid-induced osteoporosis is increasing. Although most of these fractures are asymptomatic, a small number of children may have severe pain. In this case report we are presenting long-term result of a 9-year-old patient with intractable pain due to glucocorticoid-induced osteoporotic vertebral fracture managed by kyphoplasty. Case report. Case report of a 9-year-old girl who had L3 vertebral fracture due to glucocorticoid-induced osteoporosis treated by kyphoplasty. The patient was a 9-year-old girl with severe back pain, and lupus nephritis. Glucocorticoid-induced L3 vertebral fracture was detected and the case was resistant to conservative treatment. Seeing this, we have performed balloon kyphoplasty procedure to L3 vertebrae. No complication and pain was observed after the operation although L3 vertebral height could not restored. On the 8-year control, L3 vertebral height was almost totally restored with a compression index of 10% without any clinical problem. To the best of the authors' knowledge, the patient sample of this case report is the first and the youngest patient who was treated with kyphoplasty for vertebral compression fracture intractable pain due to glucocorticoid-induced osteoporosis, mentioned in literature. During the 8-year follow-up, no adverse effect was reported that was related to kyphoplasty procedure. This case report indicates that kyphoplasty can be an alternative method for selective pediatric intractable painful vertebral glucocorticoid-induced osteoporotic fractures, but it should be performed after careful consideration in pediatric group. We do not advise routine usage of kyphoplasty for pediatric vertebral fractures.

  2. Cement leakage as a possible complication of balloon kyphoplasty--is there a difference between osteoporotic compression fractures (AO type A1) and incomplete burst fractures (AO type A3.1)?

    Science.gov (United States)

    Walter, Jan; Haciyakupoglu, Ersin; Waschke, Albrecht; Kalff, Rolf; Ewald, Christian

    2012-02-01

    Besides the treatment of osteoporotic vertebral compression fractures of AO type A1, balloon kyphoplasty (BKP) is seen as a therapeutic option even in the treatment of incomplete osteoporotic burst fractures (AO type A3.1). However, due to involvement of the posterior vertebral body wall, the risk of cement leakages is considered to be higher. This study focuses on the frequency and pattern of cement leakages in AO type A3.1 fractures compared with osteoporotic compression fractures (AO type A1). Retrospective cohort analysis was done of all patients (n = 138) treated by BKP for osteoporotic vertebral fractures (n = 173) between January 2007 and December 2010 in our department. Cement extravasations into three pre-defined anatomical compartments were evaluated on postoperative CT scans of the augmented vertebral bodies, with even minor cement detections beyond the vertebral body's wall being strictly inidicated as leakages. The frequency of cement leakages in relation to the fracture type was statistically analyzed using Pearson's chi-square test. Clinical and radiological follow-up was done 6 weeks, 3 and 6 months postoperatively. The overall cement leakage rate of BKP in 173 treated osteoporotic vertebral fractures was 30.6%. Cement extravasations were detected in 20.3% of A1.1, 30.5% of A1.2, 37.8% of A1.3, and 39.0% of A3.1 fractures, respectively. There was no statistically significant difference in the leakage rate between A3.1 and all A1 fractures (28.0%; p > 0.05), but between A3.1 and A1.1 fractures (p AO type A3.1 and all A1 fractures, subgroup analysis revealed a statistically significant higher risk of cement extrusions in A3.1 compared to A1.1 fractures. None of the affected patients showed new neurological deficits due to cement extravasations. Still, balloon kyphoplasty can be considered a safe procedure, even in the treatment of painful osteoporotic vertebral fractures of AO type A3.1.

  3. Percutaneous vertebroplasty and kyphoplasty; Perkutane Vertebroplastie und Kyphoplastie

    Energy Technology Data Exchange (ETDEWEB)

    Wetzel, S.G. [Basel Univ. (Switzerland). Abt. fuer Neuroradiologie; Wilhelm, K.E. [Radiologische Universitaetsklinik Bonn (Germany)

    2006-09-15

    With percutaneous vertebroplasty, a minimal invasive method, bone cement is injected under radiological control into a vertebra. The technique was first applied for treatment of aggressive hemangiomas. Today, osteoporotic compression fractures and other vertebral pathologies that cause pain - foremost metastasis - are the main indications for PVP. Kyphoplasty (KP) is closely related to PVP; with this technique expandable balloons are introduced into a vertebra and the cavity is then filled with bone cement. Apart from pain treatment and stabilisation of the vertebra, the aim of the method is to restore and correct a local kyphosis. In this article the indications for both PVP and KP are discussed and the value of an interdisciplinary discussion that takes alternative therapeutic methods into account is stressed. Additionally, the technical aspects and the potential complications of the methods are explained. Finally, the therapeutic results of PVP and KP are reviewed in light of published results and our own experiences. (orig.)

  4. Kyphoplasty for severe osteoporotic vertebral compression fractures

    International Nuclear Information System (INIS)

    Bao Zhaohua; Wang Genlin; Yang Huilin; Meng Bin; Chen Kangwu; Jiang Weimin

    2010-01-01

    Objective: To evaluate the clininal efficacy of kyphoplasty for severe osteoporotic vertebral compression fractures. Methods: Forty-five patients with severe osteoporotic compressive fractures were treated by kyphoplasty from Jan 2005 to Jan 2009. The compressive rate of the fractured vertebral bodies was more than 75%. According to the morphology of the vertebral compression fracture bodies the unilateral or bilateral balloon kyphoplasty were selected. The anterior vertebral height was measured on a standing lateral radiograph at pre-operative, post-operative (one day after operation) and final follow-up time. A visual analog scale(VAS) and the Oswestry disability index (ODI) were chosen to evaluate pain status and functional activity. Results: The mean follow-up was for 21.7 months (in range from 18 to 48 months). The anterior vertebral body height of fracture vertebra was restored from preoperative (18.7 ± 3.1)% to postoperative (51.4 ± 2.3)%, the follow-up period (50.2 ± 2.7)%. There was a significant improvement between preoperative and postoperative values (P 0.05). The VAS was 8.1 ± 1.4 at preoperative, 2.6 ± 0.9 at postoperative, 2.1 ± 0.5 at final follow-up time; and the ODI was preoperative 91.1 ± 2.3, postoperative 30.7 ± 7.1, follow-up period 26.1 ± 5.1. There was statistically significant improvement in the VAS and ODI in the post-operative assessment compared with the pre-operative assessment (P 0.05). Asymptomatic cement leakage occurred in three cases. New vertebral fracture occurred in one case. Conclusion: The study suggests that balloon kyphoplasty is a safe and effective procedure in the treatment of severe osteoporotic vertebral compression fractures. (authors)

  5. Development of a Novel Method for Intraoperative Radiotherapy During Kyphoplasty for Spinal Metastases (Kypho-IORT)

    Energy Technology Data Exchange (ETDEWEB)

    Schneider, Frank, E-mail: frank.schneider@umm.de [Department of Radiation Oncology, University Medical Center Mannheim, University of Heidelberg (Germany); Greineck, Fabian; Clausen, Sven; Mai, Sabine [Department of Radiation Oncology, University Medical Center Mannheim, University of Heidelberg (Germany); Obertacke, Udo [Department of Orthopaedics and Trauma Surgery, University Medical Center Mannheim, University of Heidelberg (Germany); Reis, Tina; Wenz, Frederik [Department of Radiation Oncology, University Medical Center Mannheim, University of Heidelberg (Germany)

    2011-11-15

    Purpose: Approximately 30% of patients with cancer receive bone metastases, of which 50% are in the spine. Approximately 20% present with unstable lesions requiring surgical intervention, followed by fractionated radiotherapy over 2-4 weeks to prevent early regrowth. Because of the limited survival time of patients with metastatic cancer, novel treatment concepts shortening the overall treatment time or hospitalization are desirable. In this study, we established a novel approach for intraoperative radiotherapy during kyphoplasty (Kypho-IORT), a method that combines stabilizing surgery and radiotherapy within one visit, after estimating the percentage of eligible patients for this treatment. Methods and Materials: To estimate the percentage of eligible patients, 53 planning CTs (897 vertebrae) of patients with spinal metastases were evaluated. The number of infiltrated vertebrae were counted and classified in groups eligible or not eligible for Kypho-IORT. The Kypho-IORT was performed in a donated body during a standard balloon kyphoplasty using the INTRABEAM system and specially designed applicators. A single dose of 10 Gy (in 10 mm) was delivered over 4 min to the vertebra. This was verified using two ionization chambers and a Monte Carlo simulation. Results: The estimation of eligible patients resulted in 34% of the evaluated patients, and thus 34% of patients with instable spinal metastases are suitable for Kypho-IORT. This study shows also that, using the approach presented here, it is possible to perform an IORT during kyphoplasty with an additional 15 min operation time. The measurement in the donated body resulted in a maximum dose of 3.8 Gy in the spinal cord. However, the Monte Carlo depth dose simulation in bone tissue showed 68% less dose to the prescription depth. Conclusion: We present for the first time a system using an x-ray source that can be used for single-dose IORT during kyphoplasty. The described Kypho-IORT can decrease the overall treatment

  6. Risk Factors for Cement Leakage After Vertebroplasty or Kyphoplasty: A Meta-Analysis of Published Evidence.

    Science.gov (United States)

    Zhan, Yi; Jiang, Jianzhong; Liao, Haifen; Tan, Haitao; Yang, Keqin

    2017-05-01

    Cement leakage is the most common complication of vertebroplasty and kyphoplasty. So far, the reported risk factors remain conflicting because of limited data and lack of uniform measurement and evaluation. Here, we performed a systematic review and meta-analysis of potential risk factors for cement leakage after vertebroplasty or kyphoplasty. Relevant literature was retrieved using PubMed, EMBASE, Cochrane Controlled Trial Register, and MEDLINE with no language restriction, supplemented by a hand search of the reference lists of selected articles. A fixed-effects model was used if homogeneity existed among included studies; otherwise, a random-effects model was used. The results were presented with weighted mean difference for continuous outcomes and odds ratio (OR) for dichotomous outcomes with a 95% confidence interval (CI). Twenty-two studies consisting of 2872 patients with 4187 vertebrae were included in the meta-analysis. The incidences of cement leakage for percutaneous vertebroplasty and percutaneous balloon kyphoplasty were 54.7% and 18.4%, respectively. The significant risk factors for new vertebral compression fractures were intravertebral cleft (OR, 1.40; 95% CI, 1.09-1.78; P risk factors. The results of this meta-analysis suggest that patients with intravertebral cleft, cortical disruption, low cement viscosity, and high volume of injected cement may be at high risk for cement leakage after vertebroplasty or kyphoplasty. Rigorous patient selection and individual therapeutic strategy irrespective of age, sex and fracture type, operation level, and surgical approach may reduce the occurrence of cement leakage. Given the inherent limitation of the meta-analysis, more large sample-sized randomized controlled trials are needed to further validate the present findings. Copyright © 2017 Elsevier Inc. All rights reserved.

  7. Vertebroplasty and Kyphoplasty

    Science.gov (United States)

    ... may discuss with your doctor any changes or side effects you have experienced since your procedure or treatment. top of page What are the benefits vs. risks? Benefits Vertebroplasty and kyphoplasty can increase a patient's functional abilities and allow return to the previous level ...

  8. Alternative analyses for handling incomplete follow-up in the intention-to-treat analysis: the randomized controlled trial of balloon kyphoplasty versus non-surgical care for vertebral compression fracture (FREE

    Directory of Open Access Journals (Sweden)

    Ranstam Jonas

    2012-03-01

    Full Text Available Abstract Background Clinical trial participants may be temporarily absent or withdraw from trials, leading to missing data. In intention-to-treat (ITT analyses, several approaches are used for handling the missing information - complete case (CC analysis, mixed-effects model (MM analysis, last observation carried forward (LOCF and multiple imputation (MI. This report discusses the consequences of applying the CC, LOCF and MI for the ITT analysis of published data (analysed using the MM method from the Fracture Reduction Evaluation (FREE trial. Methods The FREE trial was a randomised, non-blinded study comparing balloon kyphoplasty with non-surgical care for the treatment of patients with acute painful vertebral fractures. Patients were randomised to treatment (1:1 ratio, and stratified for gender, fracture aetiology, use of bisphosphonates and use of systemic steroids at the time of enrolment. Six outcome measures - Short-form 36 physical component summary (SF-36 PCS scale, EuroQol 5-Dimension Questionnaire (EQ-5D, Roland-Morris Disability (RMD score, back pain, number of days with restricted activity in last 2 weeks, and number of days in bed in last 2 weeks - were analysed using four methods for dealing with missing data: CC, LOCF, MM and MI analyses. Results There were no missing data in baseline covariates values, and only a few missing baseline values in outcome variables. The overall missing-response level increased during follow-up (1 month: 14.5%; 24 months: 28%, corresponding to a mean of 19% missing data during the entire period. Overall patterns of missing response across time were similar for each treatment group. Almost half of all randomised patients were not available for a CC analysis, a maximum of 4% were not included in the LOCF analysis, and all randomised patients were included in the MM and MI analyses. Improved estimates of treatment effect were observed with LOCF, MM and MI compared with CC; only MM provided improved

  9. Sensor System for Super-Pressure Balloon Performance Modeling Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Long-duration balloon flights are an exciting new area of scientific ballooning, enabled by the development of large super-pressure balloons. As these balloons...

  10. Kyphoplasty for the treatment of incomplete osteoporotic burst fractures

    Science.gov (United States)

    Zettl, Ralph; Ziring, Ewgeni; Mann, Dieter; Schnabel, Michael; Ruchholtz, Steffen

    2010-01-01

    Kyphoplasty has become a standard procedure in the treatment of painful osteoporotic compression fractures. According to current guidelines, involvement of the posterior wall of the vertebral body is a relative contraindication. From February 2002 until January 2008, 97 patients with at least one AO classification A 3.1 fracture were treated by kyphoplasty. There was a structured follow-up for the medium-term evaluation of the patients’ outcome. Ninety-seven patients (68 of whom were females and 29 of whom were males) with involvement of the vertebra’s posterior margin averaging 76.1 ± 12.36 (59–98) years were treated by kyphoplasty. The fractures of 75 patients were caused by falls from little height, 5 patients had suffered traffic accidents and in the case of 17 patients, no type of trauma was remembered. According to the AO classification, there were 109 A 3.1.1 and one A3.1.3 injuries. Prior to surgery, all patients were neurologically without pathological findings. Seventy-nine fractures were accompanied by a narrowing of the spinal canal [average of 15% (10–40)]. Overall, 134 vertebras were treated by Balloon kyphoplasty (81 × 1 segment, 22 × 2 segments, 3 × 3 segments). In 47.4% of the patients, cement leakage was observed after surgery. All patients with cement extravasation, however, were clinically unremarkable. Using the visual analog scale, patients stated that prior to surgery their pain averaged 8.1, whereas after surgery it significantly decreased and averaged 1.6 (p osteoporotic vertebral fractures with partial inclusion of the posterior wall of the vertebral body, kyphoplasty is an effective procedure with few complications. PMID:20135334

  11. Kypho-IORT - a novel approach of intraoperative radiotherapy during kyphoplasty for vertebral metastases

    Directory of Open Access Journals (Sweden)

    Schmidt René

    2010-02-01

    Full Text Available Abstract Background Instable and painful vertebral metastases in patients with progressive visceral metastases present a common therapeutic dilemma. We developed a novel approach to deliver intraoperative radiotherapy (IORT during kyphoplasty and report the first treated case. Methods/Results 60 year old patient with metastasizing breast cancer under chemotherapy presented with a newly diagnosed painful metastasis in the 12th thoracic vertebra. Under general anaesthesia, a bipedicular approach into the vertebra was chosen with insertion of specially designed metallic sleeves to guide the electron drift tube of the miniature X-ray generator (INTRABEAM, Carl Zeiss Surgical, Oberkochen, Germany. This was inserted with a novel sheet designed for this approach protecting the drift tube. A radiation dose of 8 Gy in 5 mm distance (50 kV X-rays was delivered. The kyphoplasty balloons (KyphX, Kyphon Inc, Sunnyvale were inflated after IORT and polymethylmethacrylate cement was injected. The whole procedure lasted less than 90 minutes. Conclusion In conclusion, this novel, minimally invasive procedure can be performed in standard operating rooms and may become a valuable option for patients with vertebral metastases providing immediate stability and local control. A phase I/II study is under way to establish the optimal dose prescription.

  12. Vertebroplasty and Kyphoplasty Can Restore Normal Spine Mechanics following Osteoporotic Vertebral Fracture

    Science.gov (United States)

    Luo, Jin; Adams, Michael A.; Dolan, Patricia

    2010-01-01

    Osteoporotic vertebral fractures often lead to pain and disability. They can be successfully treated, and possibly prevented, by injecting cement into the vertebral body, a procedure known as vertebroplasty. Kyphoplasty is similar, except that an inflatable balloon is used to restore vertebral body height before cement is injected. These techniques are growing rapidly in popularity, and a great deal of recent research, reviewed in this paper, has examined their ability to restore normal mechanical function to fractured vertebrae. Fracture reduces the height and stiffness of a vertebral body, causing the spine to assume a kyphotic deformity, and transferring load bearing to the neural arch. Vertebroplasty and kyphoplasty are equally able to restore vertebral stiffness, and restore load sharing towards normal values, although kyphoplasty is better at restoring vertebral body height. Future research should optimise these techniques to individual patients in order to maximise their beneficial effects, while minimising the problems of cement leakage and adjacent level fracture. PMID:20981329

  13. Kyphoplasty: indications, contraindications and technique; Chifoplastica: indicazioni, controindicazioni e tecnica

    Energy Technology Data Exchange (ETDEWEB)

    Masala, Salvatore; Fiori, Roberto; Massari, Francesco; Simonetti, Giovanni [Tor Vergata Univ., Roma (Italy). Dipartimento di diagnostica per immagini e radiologia interventistica

    2005-07-15

    Purpose. Percutaneous Kyphoplasty is an emerging Interventional Radiology technique consisting in injecting polymethylmethacrylate (PMMA) into collapsed vertebral bodies under fluoroscopic guidance, after compaction of the cancellous bone with two dedicated balloon catheters. The purpose of our study was to assess the indications, contraindications, technique and results of our initial study. Materials and methods. Between January and May 2003 we treated 11 patients (5 men, 6 women) with vertebral collapse occurred up to three months earlier and osteoporosis or myeloma (mean age: 68.9), with pain refractory to medical therapy. All patients underwent treatment on a single vertebra (1 D7; 1 D8; 2 D12; 3 L1; 3 L2; 1 l4). Patient selection was based on clinical and instrumental criteria: conventional radiography, CT and MR were performed on all patients before the procedure. The Visual Analogue scale (VAS) for pain assessment was used to evaluate the post-procedure results. Results. All patients showed an increase in the height of the collapsed vertebral body, associated with partial or complete pain relief (VAS score decreasing from a pre-treatment score of 8 to a score of 2 after treatment). No complications related to the procedure were recorded. Conclusions. The indications for kyphoplasty include recent vertebral compression fractures due to osteoporosis, myeloma, metastasis and vertebral angioma with intractable pain and with no neurological symptoms. The main contraindications are coagulation disorders, unstable fractures or complete vertebral collapse (vertebra plana). Kyphoplasty proved to be a safe and effective method for the treatment of intractable pain due to vertebral collapse that allows for shorter hospital stays and an immediate improvement in the patient's quality of life. [Italian] Scopo. La Chifoplastica percutanea e una nuova ed emergente metodica di Radiologia Interventistica che consiste nella somministrazione di Polimetilmetacrilato (PMMA

  14. Kyphoplasty for osteoporotic vertebral fractures with posterior wall injury.

    Science.gov (United States)

    Abdelgawaad, Ahmed Shawky; Ezzati, Ali; Govindasamy, Ramachandran; Krajnovic, Branko; Elnady, Belal; Said, Galal Zaki

    2017-11-14

    Cement augmentation techniques are standard treatments for osteoporotic vertebral fractures. Compared with vertebroplasty, kyphoplasty is associated with lower rates of cement leak and better deformity correction; however, posterior wall fractures are relative, but not absolute; contraindications for both techniques and hence treatment practices vary among spine centers. The primary aim of this study was to assess our center's incidence of posterior cement leakage in osteoporotic vertebral fractures with posterior wall injury treated by balloon kyphoplasty (BKP). Secondarily, physiological results, pain relief, complication rates, and non-posterior cement leakage were also evaluated. This is a prospective cohort study done in a high-volume spine center in Germany. Eighty-two patients with 98 osteoporotic vertebral fractures with posterior wall cortical injury were studied from 2012 to 2016. The following were the outcome measures: (1) physiological measures: standing plain x-rays (anteroposterior and lateral views), with the following parameters evaluated: cement leak behind the posterior vertebral body border, Cobb angle for local sagittal deformity, vertebral wedge angle, and anterior vertebral height; (2) cement volume injected in each vertebra; and (3) self-report measures: visual analog scale (VAS). All patients underwent BKP using a bipedicular approach. Preoperative clinical and neurologic evaluations were done. Radiological evaluations included plain x-rays, computed tomography scans and magnetic resonance imaging. The average follow-up period was 18 months. No cement leakage into the spinal canal occurred in any of the patients. Asymptomatic leakage into other sites was seen in 22 vertebrae (22.45%). There was significant improvement in the Cobb angle, the vertebral wedge angle, and the anterior vertebral height in all cases. The mean preoperative VAS was 8.1, and this improved to 2.3 on the third postoperative day. Balloon kyphoplasty is a viable option

  15. Significantly reduced radiation exposure to operators during kyphoplasty and vertebroplasty procedures: methods and techniques.

    Science.gov (United States)

    Ortiz, A O; Natarajan, V; Gregorius, D R; Pollack, S

    2006-05-01

    Vertebroplasty and kyphoplasty can be associated with significant radiation exposure to the operator. We compared the exposure levels to an operator performing vertebral fracture augmentation with vertebroplasty and kyphoplasty, to assess a cement injection and a monitoring technique designed to reduce this exposure. A neuroradiologist performed 189 consecutive vertebral augmentation procedures in 135 patients with osteoporotic compression fractures by using a bilateral approach with biplane pulse fluoroscopy at 7.5 pulses/second. Cement delivery was performed with intermittent fluoroscopy with kyphoplasty and vertebroplasty by using syringes or continuous fluoroscopic monitoring with a cement delivery system (CDS). Data collection included time and operator exposure parameters. A total of 87 kyphoplasty procedures, 82 vertebroplasty procedures with a CDS (VP-CDS), and 20 vertebroplasty procedures with syringes (VP-S) were safely performed. Mean fluoroscopy time for device positioning was 4.3 minutes for each procedure type. Mean fluoroscopy time (minutes) for cement delivery was significantly different for the 3 procedure types; 2.1 for kyphoplasty, 3.7 for VP-CDS, and 1.5 for VP-S (P exposure rates (microsieverts/minute) were 0.8 for kyphoplasty, 1.1 for VP-CDS, and 0.3 for VP-S during device-positioning and 1.7 for kyphoplasty, 2.9 for VP-CDS, and 0.2 for VP-S during cement injection (P technique and intermittent fluoroscopy with kyphoplasty and vertebroplasty with syringes results in a significantly lower operator exposure rate compared with vertebroplasty with a CDS.

  16. The early stage adjacent disc degeneration after percutaneous vertebroplasty and kyphoplasty in the treatment of osteoporotic VCFs.

    Directory of Open Access Journals (Sweden)

    Jun Qian

    Full Text Available BACKGROUND: The purpose of this paper is to determine the early incidence of disc de- generation adjacent to the vertebral body of osteoporotic fracture treated with percutaneous vertebroplasty or balloon kyphoplasty and whether adjacent disc degeneration is accelerated by this two procedures. METHODS: 182 patients with painful vertebral compression fractures were treated. A total of 97 patients were enrolled in this prospective study. 97 patients with a mean age of 65.3 years were classified into control group and surgical treatment group of non-random. 35 patients were in control group and 62 patients who were performed percutaneous vertebroplasty or balloon kyphoplasty in treatment group. X-ray and Magnetic resonance imaging were done at the first and final visit. The grade of disc degeneration above the fractured vertebral was confirmed by evaluation of bony oedema in the fat suppressed sequences and T2-weighted image of magnetic resonance imaging. The height of degenerative disc was measured on X-ray film. RESULTS: All patients were followed up two years after the first visit and the follow-up rate was 90.7% (88/97. The incidence of degeneration of adjacent disc above the fractured vertebral was 29.0% (9/31 in control group and 52.6% (30/57 in treatment group. It presented a statistically significant difference between two groups about the incidence of adjacent disc degeneration (P=0.033. The percentage of adjacent disc height reduction in control group was 13.5% and 17.6% in treatment group. Statistically significant difference of VAS score and ODI was not found between the first evaluation postoperatively and the final follow-up in treatment group (P>0.05. CONCLUSIONS: Disc degeneration adjacent to the fractured vertebral is accelerated by VP and BK procedures in the early stage, but clinical outcomes has not been weakened even in the presence of accelerated disc degeneration.

  17. Kyphoplasty - Vertebroplasty. A critical assessment; Kyphoplastie - Vertebroplastie. Eine kritische Standortbestimmung

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    Kasperk, C. [Medizinische Universitaetsklinik Heidelberg, Sektion Osteologie, Heidelberg (Germany)

    2015-10-15

    Painful vertebral compression fractures. Analgesia. Osteoplastic procedures, such as kyphoplasty and vertebroplasty. Anamnestic and radiological associations of clinical complaints with the radiomorphological findings of vertebral compression fractures are required for an adequate consideration to assess whether an osteoplastic procedure should be carried out. A computed tomography (CT) scan allows a reliable judgement whether an osteoplastic procedure is technically feasible and promising to improve the local vertebral fracture-associated pain. Prospective controlled trials have demonstrated a satisfactory improvement of back pain associated with vertebral fractures and parameters of quality of life by osteoplastic interventions. No prospective, truly sham-controlled blind trials are currently available which demonstrate an advantage of osteoplastic interventions compared to standard pain treatment; however, the currently published prospective controlled trials show a satisfactory pain reduction by osteoplastic interventions, such as kyphoplasty and vertebroplasty. Painful vertebral fractures and progressive loss of vertebral height of compression fractures should be evaluated in an interdisciplinary team consisting of radiologists, spinal surgeons and internists to assess whether an osteoplastic procedure is technically feasible and promising to improve local pain and immobility associated with vertebral fractures. (orig.) [German] Schmerzhafte Wirbelkoerpersinterungsfraktur. Schmerztherapie. Osteoplastische Verfahren wie die Kyphoplastie und die Vertebroplastie. Anamnestische und bildgebende (moeglichst CT) Assoziation der klinischen Beschwerden (Hauptschmerzbereich) mit dem radiologischen Befund eines eingebrochenen Wirbelkoerpers. Das CT gestattet am zuverlaessigsten eine Beurteilung der technischen Durchfuehrbarkeit eines osteoplastischen Verfahrens bei einer Wirbelkoerpersinterungsfraktur. Kontrollierte prospektive Studien belegen die schmerzreduzierende

  18. Complication of cemented vertebra after kyphoplasty in osteoporotic compression fracture.

    Science.gov (United States)

    Lee, Jung Hee; Jeong, Bi O

    2012-11-01

    The reported case is of a postmenopausal woman with kyphoplasty for an L1 osteoporotic compression fractures (OCF) presenting with progressive kyphosis and paraparesis that developed with no history of other traumas. Serial radiographs and computed tomography were performed, followed by magnetic resonance (MR) imaging. On serial radiographs, local kyphosis and neurologic deficit progressed with collapse of the cemented vertebra. MR scan and histologic examination diagnosed avascular necrosis (AVN). The symptoms resolved after posterior vertebral column resection of the collapsed cemented vertebral body and correction of the deformity. Although kyphoplasty is a simple and safe procedure for the management of pain in OCFs, careful follow-up is required as collapse of the cemented vertebra may be an AVN of the cemented vertebra and lead to neurologic deficit over time.

  19. Primary pyogenic spondylitis following kyphoplasty: a case report

    Directory of Open Access Journals (Sweden)

    Heyse Thomas J

    2011-03-01

    Full Text Available Abstract Introduction Only ten cases of primary pyogenic spondylitis following vertebroplasty have been reported in the literature. To the best of our knowledge, we present the first reported case of primary pyogenic spondylitis and spondylodiscitis caused by kyphoplasty. Case presentation A 72-year old Caucasian man with an osteoporotic compression fracture of the first lumbar vertebra after kyphoplasty developed sensory incomplete paraplegia below the first lumbar vertebra. This was caused by myelon compression following pyogenic spondylitis with a psoas abscess. Computed tomography guided aspiration of the abscess cavity yielded group C Streptococcus. The psoas abscess was percutaneously drained and laminectomy and posterior instrumentation with an internal fixator from the eleventh thoracic vertebra to the fourth lumbar vertebra was performed. In a second operation, corpectomy of the first lumbar vertebra with cement removal and fusion from the twelfth thoracic vertebra to the second lumbar vertebra with a titanium cage was performed. Six weeks postoperatively, the patient was pain free with no neurologic deficits or signs of infection. Conclusion Pyogenic spondylitis is an extremely rare complication after kyphoplasty. When these patients develop recurrent back pain postoperatively, the diagnosis of pyogenic spondylitis must be considered.

  20. Vertebral Augmentation Involving Vertebroplasty or Kyphoplasty for Cancer-Related Vertebral Compression Fractures: An Economic Analysis

    Science.gov (United States)

    2016-01-01

    Background Untreated vertebral compression fractures can have serious clinical consequences and impose a considerable impact on patients' quality of life and on caregivers. Since non-surgical management of these fractures has limited effectiveness, vertebral augmentation procedures are gaining acceptance in clinical practice for pain control and fracture stabilization. The objective of this analysis was to determine the cost-effectiveness and budgetary impact of kyphoplasty or vertebroplasty compared with non-surgical management for the treatment of vertebral compression fractures in patients with cancer. Methods We performed a systematic review of health economic studies to identify relevant studies that compare the cost-effectiveness of kyphoplasty or vertebroplasty with non-surgical management for the treatment of vertebral compression fractures in adults with cancer. We also performed a primary cost-effectiveness analysis to assess the clinical benefits and costs of kyphoplasty or vertebroplasty compared with non-surgical management in the same population. We developed a Markov model to forecast benefits and harms of treatments, and corresponding quality-adjusted life years and costs. Clinical data and utility data were derived from published sources, while costing data were derived using Ontario administrative sources. We performed sensitivity analyses to examine the robustness of the results. In addition, a 1-year budget impact analysis was performed using data from Ontario administrative sources. Two scenarios were explored: (a) an increase in the total number of vertebral augmentation procedures performed among patients with cancer in Ontario, maintaining the current proportion of kyphoplasty versus vertebroplasty; and (b) no increase in the total number of vertebral augmentation procedures performed among patients with cancer in Ontario but an increase in the proportion of kyphoplasties versus vertebroplasties. Results The base case considered each of

  1. Comparison of effectiveness of kyphoplasty and vertebroplasty in patients with osteoporotic vertebra fractures.

    Science.gov (United States)

    Ateş, Ahmet; Gemalmaz, Halil Can; Deveci, Mehmet Ali; Şimşek, Sezai Aykın; Çetin, Engin; Şenköylü, Alpaslan

    2016-12-01

    The aim of this study was to compare the functional and radiological outcomes of vertebroplasty and kyphoplasty in patients with osteoporotic vertebra fractures. The files of the patients who underwent vertebroplasty or kyphoplasty for osteoporotic vertebrae fractures were retrieved from the archives. Forty-three patients with complete follow-up data were included in the study group. The patients were evaluated for radiological outcomes in terms of local kyphosis angle, wedging index, compression ratio, visual analog pain scale (VAS) and Oswestry Disability Index (ODI). In the study group, kyphoplasty was performed on 24 vertebrae of 22 patients (17 females, 5 males; mean age: 73 years) whereas vertebroplasty was applied on 24 vertebrae of 21 (16 females, 5 males; mean age: 74.7 years) patients. The mean follow-up time was 26 months. When the VAS and ODI values of the groups were analyzed, both groups showed statistically significant progress after the operation. Radiological data showed that the kyphoplasty group showed statistically significant improvement in the sagittal index values whereas the vertebroplasty group did not. The overall complication ratio was 4%. Both vertebroplasty and kyphoplasty are effective treatment methods for functional recovery and pain relief in osteoporotic fractures of the vertebra. Although radiological outcomes of the kyphoplasty seem to be better, this does not have any clinical relevance. We suggest vertebroplasty over kyphoplasty since it is an easier method to manage. Level III, Therapeutic study. Copyright © 2016 Turkish Association of Orthopaedics and Traumatology. Production and hosting by Elsevier B.V. All rights reserved.

  2. The Role of Minimally Invasive Vertebral Body Stent on Reduction of the Deflation Effect After Kyphoplasty: A Biomechanical Study.

    Science.gov (United States)

    Wang, Dalin; Zheng, Shengnai; Liu, An; Xu, Jie; Du, Xiaotao; Wang, Yijin; Wang, Liming

    2018-03-15

    Biomechanical investigation using cadaver spines. The aim of the present study was to assess the magnitude of the deflation effect after balloon kyphoplasty (BKP) or use of minimally invasive vertebral body stent (MIVBS) in in vitro biomechanical condition. BKP is a well-established minimally invasive treatment option for osteoporotic vertebral compression fractures. However, this technique can lead to a secondary height loss-known as the "deflation effect"-causing intrasegmental kyphosis and an overall alignment failure. The study was conducted on 24 human cadaveric vertebral bodies (T12-L5). After creating a compression fracture model, the fractured vertebral bodies were reduced by BKP (n = 12) or by MIVBS (n = 12) and then augmented with polymethyl methacrylate bone cement. Each step of the procedure was performed under fluoroscopic guidance and the results were analyzed quantitatively. Finally, the strength and stiffness of augmented vertebral bodies were measured by biomechanical tests. Complete initial reduction of the fractured vertebral body height was achieved by both systems. Secondary loss of reduction after balloon deflation was significantly greater in the BKP group (2.36 ± 0.63 mm vs. 0.34 ± 0.43 mm in the MIVBS group; P deflation effect after BKP can be significantly decreased with the use of the MIVBS technique. N/A.

  3. A device for performing automated balloon catheter inflation ischemia studies.

    Science.gov (United States)

    Leavesley, Silas J; Ledkins, Whitley; Rocic, Petra

    2014-01-01

    Coronary collateral growth (arteriogenesis) is a physiological adaptive response to transient and repetitive occlusion of major coronary arteries in which small arterioles (native collaterals) with minimal to no blood flow remodel into larger conduit arteries capable of supplying adequate perfusion to tissue distal to the site of occlusion. The ability to reliably and reproducibly mimic transient, repetitive coronary artery occlusion (ischemia) in animal models is critical to the development of therapies to restore coronary collateral development in type II diabetes and the metabolic syndrome. Current animal models for repetitive coronary artery occlusion implement a pneumatic occluder (balloon) that is secured onto the surface of the heart with the suture, which is inflated manually, via a catheter connected to syringe, to effect occlusion of the left anterior descending coronary artery (LAD). This method, although effective, presents complications in terms of reproducibility and practicality. To address these limitations, we have designed a device for automated, transient inflation of balloon catheters in coronary artery occlusion models. This device allows repeated, consistent inflation (to either specified pressure or volume) and the capability for implementing very complex, month-long protocols. This system has significantly increased the reproducibility of coronary collateral growth studies in our laboratory, resulting in a significant decrease in the numbers of animals needed to complete each study while relieving laboratory personnel from the burden of extra working hours and enabling us to continue studies over periods when we previously could not. In this paper, we present all details necessary for construction and operation of the inflator. In addition, all of the components for this device are commercially available and economical (Table S1). It is our hope that the adoption of automated balloon catheter inflation protocols will improve the experimental

  4. A device for performing automated balloon catheter inflation ischemia studies.

    Directory of Open Access Journals (Sweden)

    Silas J Leavesley

    Full Text Available Coronary collateral growth (arteriogenesis is a physiological adaptive response to transient and repetitive occlusion of major coronary arteries in which small arterioles (native collaterals with minimal to no blood flow remodel into larger conduit arteries capable of supplying adequate perfusion to tissue distal to the site of occlusion. The ability to reliably and reproducibly mimic transient, repetitive coronary artery occlusion (ischemia in animal models is critical to the development of therapies to restore coronary collateral development in type II diabetes and the metabolic syndrome. Current animal models for repetitive coronary artery occlusion implement a pneumatic occluder (balloon that is secured onto the surface of the heart with the suture, which is inflated manually, via a catheter connected to syringe, to effect occlusion of the left anterior descending coronary artery (LAD. This method, although effective, presents complications in terms of reproducibility and practicality. To address these limitations, we have designed a device for automated, transient inflation of balloon catheters in coronary artery occlusion models. This device allows repeated, consistent inflation (to either specified pressure or volume and the capability for implementing very complex, month-long protocols. This system has significantly increased the reproducibility of coronary collateral growth studies in our laboratory, resulting in a significant decrease in the numbers of animals needed to complete each study while relieving laboratory personnel from the burden of extra working hours and enabling us to continue studies over periods when we previously could not. In this paper, we present all details necessary for construction and operation of the inflator. In addition, all of the components for this device are commercially available and economical (Table S1. It is our hope that the adoption of automated balloon catheter inflation protocols will improve the

  5. The vertebral biomechanic previous and after kyphoplasty.

    Science.gov (United States)

    Pesce, V; Piazzolla, Andrea; Moretti, L; Carlucci, S; Parato, C; Maxy, P; Moretti, B

    2013-10-01

    The biomechanical understanding of increasing anterior column load with progressing kyphosis leading to subsequent vertebral compression fracture (VCF) established the basic rationale for kyphoplasty. The lumbar spine can support an effort of 500 kg in the axis of the vertebral body, and a bending moment of 20 Nm in flexion. Consequently, if this effort is forward deviated of only 10 cm, the acceptable effort will be reduced to 20 kg so it is important to restore the vertebral anterior wall after a VCF: the authors describe the biomechanical modifications in the spine after kyphoplasty.

  6. Prophylactic adjacent-segment vertebroplasty following kyphoplasty for a single osteoporotic vertebral fracture and the risk of adjacent fractures: a retrospective study and clinical experience.

    Science.gov (United States)

    Eichler, Martin C; Spross, Christian; Ewers, Alexander; Mayer, Ryan; Külling, Fabrice A

    2016-10-01

    OBJECTIVE This study investigated the benefit of prophylactic vertebroplasty of the adjacent vertebrae in single-segment osteoporotic vertebral body fractures treated with kyphoplasty. METHODS All patients treated with kyphoplasty for osteoporotic single-segment fractures between January 2007 and August 2012 were included in this retrospective study. The patients received either kyphoplasty alone (kyphoplasty group) or kyphoplasty with additional vertebroplasty of the adjacent segment (vertebroplasty group). The segmental kyphosis with the rate of adjacent-segment fractures (ASFs) and remote fractures were studied on plain lateral radiographs preoperatively, postoperatively, at 3 months, and at final follow-up. RESULTS Thirty-seven (82%) of a possible 45 patients were included for the analysis, with a mean follow-up of 16 months (range 3-54 months). The study population included 31 women, and the mean age of the total patient population was 72 years old (range 53-86 years). In 21 patients (57%), the fracture was in the thoracolumbar junction. Eighteen patients were treated with additional vertebroplasty and 19 with kyphoplasty only. The segmental kyphosis increased in both groups at final follow-up. A fracture through the primary treated vertebra (kyphoplasty) was found in 4 (22%) of the vertebroplasty group and in 3 (16%) of the kyphoplasty group (p = 0.6). An ASF was found in 50% (n = 9) of the vertebroplasty group and in 16% (n = 3) of the kyphoplasty group (p = 0.03). Remote fractures occurred in 1 patient in each group (p = 1.0). CONCLUSIONS Prophylactic vertebroplasty of the adjacent vertebra in patients with single-segment osteoporotic fractures as performed in this study did not decrease the rate of adjacent fractures. Based on these retrospective data, the possible benefits of prophylactic vertebroplasty do not compensate for the possible risks of an additional cement augmentation.

  7. Vertebral Augmentation Involving Vertebroplasty or Kyphoplasty for Cancer-Related Vertebral Compression Fractures: A Systematic Review

    Science.gov (United States)

    Pron, Gaylene; Holubowich, Corinne; Kaulback, Kellee

    2016-01-01

    Background Cancers that metastasize to the spine and primary cancers such as multiple myeloma can result in vertebral compression fractures or instability. Conservative strategies, including bed rest, bracing, and analgesic use, can be ineffective, resulting in continued pain and progressive functional disability limiting mobility and self-care. Surgery is not usually an option for cancer patients in advanced disease states because of their poor medical health or functional status and limited life expectancy. The objectives of this review were to evaluate the effectiveness and safety of percutaneous image-guided vertebral augmentation techniques, vertebroplasty and kyphoplasty, for palliation of cancer-related vertebral compression fractures. Methods We performed a systematic literature search for studies on vertebral augmentation of cancer-related vertebral compression fractures published from January 1, 2000, to October 2014; abstracts were screened by a single reviewer. For those studies meeting the eligibility criteria, full-text articles were obtained. Owing to the heterogeneity of the clinical reports, we performed a narrative synthesis based on an analytical framework constructed for the type of cancer-related vertebral fractures and the diversity of the vertebral augmentation interventions. Results The evidence review identified 3,391 citations, of which 111 clinical reports (4,235 patients) evaluated the effectiveness of vertebroplasty (78 reports, 2,545 patients) or kyphoplasty (33 reports, 1,690 patients) for patients with mixed primary spinal metastatic cancers, multiple myeloma, or hemangiomas. Overall the mean pain intensity scores often reported within 48 hours of vertebral augmentation (kyphoplasty or vertebroplasty), were significantly reduced. Analgesic use, although variably reported, usually involved parallel decreases, particularly in opioids, and mean pain-related disability scores were also significantly improved. In a randomized controlled

  8. Case report: Treatment by radiofrequency kyphoplasty of an 85-year-old woman with a traumatic osteoporotic fracture of the first lumbar vertebra

    Directory of Open Access Journals (Sweden)

    Heck P

    2011-01-01

    Full Text Available A 85-year old female patient had an A1.2-fracture of the L1 after a fall on the lower back. The fracture was treated with radio frequency kyphoplasty on the following day. Without complications during the course, the patient could be dismissed free of pain on the second day post-op. After 3 month follow-up the patient was painless in the area of the lumbar spine and without functional restrictions. The X-ray examination showed neither changes in the location of L1 nor adjacent fractures. The indication was put by request of the patient divergent to the guidelines. The discussion about the benefits of treatment with balloon kyphoplasty versus medicinal pain treatment is still controversial. There are no studies on RF-Kyphoplasty and its advantages over the mentioned procedures. However, all cases being published so far including this case out of a series of positive cases lead to the assumption that RF-Kyphoplasty is at least equivalent to established procedures, if not better. However, further studies are required.

  9. Evolution of bone mineral density after percutaneous kyphoplasty in fresh osteoporotic vertebral body fractures and adjacent vertebrae along with sagittal spine alignment.

    Science.gov (United States)

    Korovessis, Panagiotis; Zacharatos, Spyridon; Repantis, Thomas; Michael, Andreas; Karachalios, Dionysios

    2008-06-01

    Prospective controlled cohort study of 27 adult osteoporotic patients who underwent kyphoplasty for fresh osteoporotic spinal fractures. To define the evolution of vertebral bone mineral density (BMD) at kyphoplasty and adjacent levels along with sagittal spinal alignment to contribute to the etiology of adjacent vertebral fractures after augmentation. Osteoporotic compression fractures can be effectively treated with methylmethacrylate vertebral augmentation. However, to the authors' knowledge the effect of vertebral augmentation on the vertebral endplate BMD of the augmented and adjacent nonaugmented levels has not as yet been described. Twenty-seven consecutive selected patients (9 men, 18 women), with an average age of 72+/-9 years underwent 1, 2, or 3-level percutaneous kyphoplasty for painful fresh osteoporotic vertebral fractures at the thoracolumbar spine. All patients were radiologically examined with plain roentgenograms, computed tomography, and magnetic resonance imaging. Lateral dual energy x-ray absorptiometry in the augmented and on the adjacent vertebrae (1 level above and below kyphoplasty) was used to measure BMD preoperatively to the last postoperative observation in the subchondral bone of the vertebral endplates. Anthropometric data, sagittal global balance (plumbline), and segmental spine reconstruction (vertebral body height, Gardner kyphotic angle) were recorded and analyzed. The patients were followed for at least 2 years. Kyphoplasty was performed between T12 and L5. A total of 48 vertebral bodies were augmented. Thirteen patients received 1 level and the remaining 14 received 2 or 3-level kyphoplasty. No significant changes in the sagittal spinal balance were shown postoperatively. Gardner kyphotic angle and posterior vertebral body height improved postoperatively, however, insignificantly. Significant [analysis of variance (ANOVA), P=0.008] increase of anterior vertebral body height in the fractured vertebra was achieved postoperatively

  10. Performance of the high-altitude balloon experiment Roto-lok drive gimbal systems

    Science.gov (United States)

    Schulthess, Marcus R.; Ardaman, Andrew A.; Baugh, Steven; Carson, Donald G.

    1994-07-01

    This paper presents and discusses laboratory performance measurements of a Roto-Lok drive system for the HABE azimuth and elevation gimbals. The HABE system is a 7,000 lb acquisition tracking and pointing (ATP) balloon-launched vehicle. The primary azimuth and elevation drive systems are zero-backlash torque multipliers referred to by the trade name Roto-Lok rotary drive and designed by Sagebrush Technology, Inc. The Roto-Lok used in the azimuth gimbal has a limited 320 deg of angular travel; therefore, it is supplemented with a secondary drive element to provide unlimited travel. This secondary drive is used to counteract the gross angles resulting from the freely rotating nature of the untethered balloon system. The Roto-Lok drive is used for the fine tracking and pointing of the gimbals. Both the azimuth and elevation Rota-Lok drives are tandem drives with an end-to-end ratio of 72:1. Performance specifications developed from the mission requirements are compared against the actual system performance measurements. The entire gimbaled azimuth and elevation systems are required to point in inertial space to less than 250 (mu) rad RMS over the band DC to 100 Hz for each axis. Performance measurements better than the specification were measured. The primary gimbal base-motion disturbances, however, are due to the motor cogging torque or torque ripple. A brief discussion of the measurement methods and the control system used to drive the gimbals is presented. Several system anomalies, such as the structural compliance between the drive element and the inertial rate sensors and the coarse gear backlash, are discussed in terms of their impact on the gimbal control system.

  11. Development and performance of the advanced hard x-ray telescope for the balloon experiment

    Science.gov (United States)

    Miyazawa, Takuya; Shibata, Ryo; Ogasaka, Yasushi; Fukaya, Yoshihiro; Naitou, Masataka; Iwahara, Tomonaga; Shimoda, Kenta; Tamura, Keisuke; Furuzawa, Akihiro; Kunieda, Hideyo; Yamashita, Koujun; Yokoi, Shin; Yoshii, Takuma; Watanabe, Naoya; Namba, Yoshiharu

    2006-06-01

    Imaging observation in the hard X-ray band of 10 - 100 keV is one of the important subjects in X-ray astronomy. Though SUMIT balloon-borne experiment, we have developed thin-foil-nested hard X-ray telescope employing depth-graded Pt/C multilayer (multilayer-supermirror). We have improved production process of the replica reflector and telescope optics compared with InFOCμS-2004 telescope. The new telescope was measured at synchrotron radiation facility, SPring-8. The image quality and throughtput were estimated to be 2.06 arcmin (half power diameter) and 85 % at 30 keV, respectively. These values were about 24 % and 30 % improvement compared to InFOCμS-2004, respectively. Limiting factors of its performance are also investigated. Based on such an investigation we are now continuously developing hard X-ray telescope for SUMIT 2006 flight.

  12. Kyphoplasty for osteoporotic fractures with spinal canal compromise

    International Nuclear Information System (INIS)

    Gan Minfeng; Yang Huilin; Zou Jun; Wang Genlin; Mei Xin; Zhou Feng; Chen Liang; Jiang Weimin

    2010-01-01

    Objective: To explore the feasibility and clinical outcome of kyphoplasty in the treatment of osteoporotic fractures with canal compromise. Methods: A total of 16 patients with osteoporotic fractures with canal compromise without neurological deficit were attempted to be treated by kyphoplasty. During kyphoplasty, modified techniques including staged bone cement injection and dynamic fluoroscopic monitoring were used. Pain was measured using the self-reporting Visual Analogue pain Scale (VAS) preoperatively, postoperatively and in the final follow-up. Disability was measured using the Oswestry Disability questionnaire (ODI) preoperatively, postoperatively and in the final follow-up. The height of the compromised vertebral body, the kyphotic angle and the spinal canal compromise were measured preoperatively, postoperatively and in the final follow-up. Results: Operations were completed smoothly, with the exception of one patient with less cement leakage but without clinical symptom occurred. Relief of pain was achieved after kyphoplasty. The mean VAS score of these patients decreased from 8.1 ± 1.2 pre-operatively to 2.7 ± 0.6 post-operatively (P 0.05). In the final follow-up, the spinal canal compromise was (14.4 ± 3.1)%. Conclusion: Kyphoplasty is a relatively safe and effective method for the treatment of osteoporotic fractures with canal compromise without neurological deficit. (authors)

  13. THE TREATMENT OF OSTEOPOROTIC VERTEBRAL FRACTURES USING KYPHOPLASTY

    Directory of Open Access Journals (Sweden)

    G. M. Kavalersky

    2010-01-01

    Full Text Available In article results of treatment of 20 patients more senior 60 years with osteoporotic fractures of thoracolumbar spine. To all patients has been executed percutaneous kyphoplasty. In process kyphoplasty restoration of ventral departments of the broken vertebra on 15+6.2 % is reached. Correction of a local kyphosis angle is reached in limits 5-10e (7,3+2,5e. Recourse of a painful syndrome with 7,1+1,9 to 2,1+1,7 on a visual analogue scale is noted. In the remote period it is noted increases in a painful syndrome, increase of a local kyphosis angle and deformations of a body of a vertebra. Thus, percutaneous kyphoplasty, being a minimally invasive astabilisation technique, allows to restore strengthening characteristics of bodies of vertebras, to increase height ventral departments of bodies, correction of the biomechanical infringements resulting fracture thereby is reached.

  14. Kyphoplasty and vertebroplasty for spinal trauma; Kyphoplastie und Vertebroplastie bei Wirbelsaeulentraumata

    Energy Technology Data Exchange (ETDEWEB)

    Ahlhelm, F. [Kantonsspital Baden AG, Abteilung fuer Neuroradiologie, Institut fuer Radiologie, Baden (Switzerland); Omidi, R. [Kantonsspital Baden AG, Interventionelle Radiologie, Institut fuer Radiologie, Baden (Switzerland)

    2016-08-15

    Minimally invasive treatment of spinal fractures. Conservative treatment versus spinal surgery. Minimally invasive stabilization techniques, such as percutaneous (assisted) cementoplasty have been introduced as new procedures. Magnetic resonance imaging (MRI), X-rays and computed tomography (CT) are the imaging techniques of first choice. The most important questions concern recent fractures, instability and indications for minimally invasive treatment. Vertebroplasty and kyphoplasty are established methods for the treatment of patients with osteoporosis. Cementoplasty techniques are promising treatment options for traumatic spinal injuries. The application of the techniques should best be carried out in individual cases within the framework of prospective controlled studies. (orig.) [German] Minimal-invasive Behandlung von Wirbelsaeulentraumata. Konservative Behandlung vs. Wirbelsaeulenchirurgie. Als neue Verfahren wurden minimal-invasive Stabilisationstechniken, z. B. perkutane (assistierte) Zementoplastien eingefuehrt. Roentgen, MRT und CT sind die bildgebenden Verfahren der ersten Wahl. Die wichtigsten Fragestellungen sind: Frische Fraktur? Instabilitaet? Indikation fuer minimal-invasive Behandlung ?Vertebroplastie und Kyphoplastie sind bei Osteoporosepatienten etabliert. Bei Wirbelsaeulentraumata sind Zementoplastietechniken vielversprechende Therapieoptionen. Die Anwendung der Techniken sollte im individuellen Fall am besten im Rahmen prospektiver kontrollierter Studien erfolgen. (orig.)

  15. Complications and safety aspects of kyphoplasty for osteoporotic vertebral fractures: a prospective follow-up study in 102 consecutive patients

    Directory of Open Access Journals (Sweden)

    Kayser Ralph

    2008-01-01

    Full Text Available Abstract Background Kyphoplasty represents an established minimal-invasive method for correction and augmentation of osteoporotic vertebral fractures. Reliable data on perioperative and postoperative complications are lacking in the literature. The present study was designed to evaluate the incidence and patterns of perioperative complications in order to determine the safety of this procedure for patients undergoing kyphoplasty. Patients and Methods We prospectively enrolled 102 consecutive patients (82 women and 20 men; mean age 69 with 135 operatively treated fractured vertebrae who underwent a kyphoplasty between January 2004 to June 2006. Clinical and radiological follow-up was performed for up 6 months after surgery. Results Preoperative pain levels, as determined by the visual analogous scale (VAS were 7.5 +/- 1.3. Postoperative pain levels were significantly reduced at day 1 after surgery (VAS 2.3 +/- 2.2 and at 6-month follow-up (VAS 1.4 +/- 0.9. Fresh vertebral fractures at adjacent levels were detected radiographically in 8 patients within 6 months. Two patients had a loss of reduction with subsequent sintering of the operated vertebrae and secondary spinal stenosis. Accidental cement extravasation was detected in 7 patients in the intraoperative radiographs. One patient developed a postoperative infected spondylitis at the operated level, which was treated by anterior corporectomy and 360 degrees fusion. Another patient developed a superficial wound infection which required surgical revision. Postoperative bleeding resulting in a subcutaneous haematoma evacuation was seen in one patient. Conclusion The data from the present study imply that percutaneous kyphoplasty can be associated with severe intra- and postoperative complications. This minimal-invasive surgical procedure should therefore be performed exclusively by spine surgeons who have the capability of managing perioperative complications.

  16. A comparison of two new technologies for percutaneous vertebral augmentation: confidence vertebroplasty vs. sky kyphoplasty.

    Science.gov (United States)

    Folman, Yoram; Shabat, Shay

    2011-07-01

    Cement vertebroplasty has been performed for over a decade to treat painful osteoporotic vertebral compression fractures (OVCFs). Kyphoplasty is considered a further step in the evolution of vertebral augmentation. To evaluate the efficiency and safety of two systems to treat OVCF: Confidence Vertebroplasty (CV) compared to Sky Kyphoplasty (SK). This prospective study included 45 patients with OVCF. Fourteen were treated with CV and 31 with SK. An imaging evaluation using a compression ratio (height of anterior vs. posterior wall) and local kyphotic deformity (Cobb angle) was performed prior to the procedure and 12 months later. Evaluation of pain was carried out using a visual analogue scale. The mean compression repair was 12% in the CV group compared to 25% in the SK group. Mean kyphotic deformity restoration achieved using CV was 41% compared to 67% using SK. In both groups the pain severity was equally reduced by a mean of 43%. The SK system is technically superior in restoring the vertebral height and repairing the kyphotic deformity, an advantage that was not manifested in pain relief - the most important variable. Both systems have a high level of safety. The cost-benefit balance clearly favors the CV system.

  17. Patient radiation exposure during different kyphoplasty techniques.

    Science.gov (United States)

    Panizza, Denis; Barbieri, Massimo; Parisoli, Francesco; Moro, Luca

    2014-01-01

    The scope of this study was to quantify patient radiation exposure during two different techniques of kyphoplasty (KP), which differ by a cement delivery method, in order to assess whether or not one of the two used methods can reduce the patient dose. Twenty patients were examined for this investigation. One X-ray fluoroscopy unit was used for localization, navigation and monitoring of cement delivery. The patient biometric data, the setting of the fluoroscope, the exposure time and the kerma-area product (KAP) were monitored in all the procedures for anteroposterior (AP) and lateral (LL) fluoroscopic projections in order to assess the range of radiation doses imparted to the patient. Theoretical entrance skin dose (ESD) and effective dose (E) were calculated from intraoperatively measured KAP. An average ET per procedure was 1.5±0.5 min for the manual injection technique (study A) and 1.4±0.4 min for the distance delivery technique (study B) in the AP plane, while 3.2±0.7 and 5.1±0.6 min in the lateral plane, respectively. ESD was estimated as an average of 0.10±0.06 Gy for study A and 0.13±0.13 Gy for study B in the AP or/and 0.59±0.46 and 1.05±0.36 Gy in the lateral view, respectively. The cumulative mean E was 1.9±1.0 mSv procedure(-1) for study A and 3.6±0.9 mSv procedure(-1) for study B. Patient radiation exposure and associated effective dose from KP may be considerable. The technique of distance cement delivery appears to be slower than the manual injection technique and it requires a more protracted fluoroscopic control in the lateral projection, so that this system entails a higher amount of dose to the patient.

  18. Patient radiation exposure during different kyphoplasty techniques

    International Nuclear Information System (INIS)

    Panizza, D.; Barbieri, M.; Parisoli, F.; Moro, L.

    2014-01-01

    The scope of this study was to quantify patient radiation exposure during two different techniques of kyphoplasty (KP), which differ by a cement delivery method, in order to assess whether or not one of the two used methods can reduce the patient dose. Twenty patients were examined for this investigation. One X-ray fluoroscopy unit was used for localization, navigation and monitoring of cement delivery. The patient bio-metric data, the setting of the fluoroscope, the exposure time and the kerma-area product (KAP) were monitored in all the procedures for anteroposterior (AP) and lateral (LL) fluoroscopic projections in order to assess the range of radiation doses imparted to the patient. Theoretical entrance skin dose (ESD) and effective dose (E) were calculated from intraoperatively measured KAP. An average ET per procedure was 1.5±0.5 min for the manual injection technique (study A) and 1.4±0.4 min for the distance delivery technique (study B) in the AP plane, while 3.2±0.7 and 5.1±0.6 min in the lateral plane, respectively. ESD was estimated as an average of 0.10±0.06 Gy for study A and 0.13±0.13 Gy for study B in the AP or/and 0.59±0.46 and 1.05±0.36 Gy in the lateral view, respectively. The cumulative mean E was 1.9±1.0 mSv procedure -1 for study A and 3.6±0.9 mSv procedure -1 for study B. Patient radiation exposure and associated effective dose from KP may be considerable. The technique of distance cement delivery appears to be slower than the manual injection technique and it requires a more protracted fluoroscopic control in the lateral projection, so that this system entails a higher amount of dose to the patient. (authors)

  19. Die gezielte physiotherapeutische Nachbehandlung nach Kyphoplastie - moderne Aspekte und Konzepte

    Directory of Open Access Journals (Sweden)

    Becker S

    2004-01-01

    Full Text Available Die minimal-invasive Therapie osteoporotischer Wirbelfrakturen mit Kyphoplastie beeinflußt die Statik der Wirbelsäule, welche einen entscheidenden Einfluß auf das Gleichgewicht des Patienten hat. Eine neue operative Behandlungsmethode erfordert eine entsprechend adaptierte moderne physiotherapeutische Nachbehandlung. In diesem Artikel werden mehrere moderne Konzepte der Nachbehandlung vorgestellt, um die Wiedereingliederung der kyphoplastierten Patienten in ihr Umfeld zu erleichtern und das allgemeine Sturzrisiko zu mindern.

  20. Performance of the transition radiation detector flown on the NMSU/WIZARD TS93 balloon-borne instrument

    Energy Technology Data Exchange (ETDEWEB)

    Aversa, F.; Barbiellini, G.; Boezio, M. [Trieste Univ. (Italy). Dip. di Fisica]|[INFN, Trieste (Italy); Basini, G.; Brancaccio, F.M. [INFN, Laboratori nazionali di Frascati, Frascati, Rome (Italy); Bellotti, R. [Bari Univ. (Italy). Dip. di Fisica]|[INFN, Bari (Italy); Bidoli, V. [Rome Univ. `Tor Vergata` (Italy). Dip. di Fisica]|[INFN, Sezione Univ. `Tor Vergata` Rome (Italy); Bocciolini, M. [Florence Univ. (Italy). Dip. di Fisica]|[INFN, Florence (Italy); Bronzini, F. [Rome Univ. `La Sapienza` (Italy). Dip. di Fisica]|[INFN, Sezione Univ. `La Sapienza` Rome (Italy)

    1995-09-01

    It is built and tested a transition radiation detector (TRD) to discriminate positrons from protons in the balloon flight TS 93 experiment. It is presented the TRD performance using flight data obtaining a proton-positron rejection factor of the order of 10{sup -3}. During the 24 hour flight, the data in the momentum range 4-50 GeV/c are collected. Using the TRD together with the Silicon calorimeter, it is achieved an overall rejection factor of about 10{sup -5} of positron against the proton background over the entire momentum range.

  1. Mars Solar Balloon Lander, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — The Mars Solar Balloon Lander (MSBL) is a novel concept which utilizes the capability of solar-heated hot air balloons to perform soft landings of scientific...

  2. Vertebroplasty and Kyphoplasty in the Treatment of Osteoporotic Vertebral Compression Fractures

    Directory of Open Access Journals (Sweden)

    Işıl Taş

    2004-12-01

    Full Text Available In our study which is carried out to detect the effect of kyphoplasty over acute vertebral fractures, 8 patients; presenting with 6 osteoporotic, 1 tumoral, 1 traumatic acute vertebra fractures underwent kyphoplasty procedure at a total of 12 levels. No postoperative complications were detected, and as achieved, in the 6 th and 12 th month follow up periods, no adjacent vertebral fracture was observed with X ray imaging. With this small series, kyphoplasty has been shown to have affirmative effects in the treatment of acute vertebral fractures with respect to the visual analogue scale, Qualeffo-41 questionnaire and morphometric vertebral height measurements.

  3. Performance of the CAPRICE98 balloon-borne gas-RICH detector

    CERN Document Server

    Bergström, D; Carlson, P J; Francke, T; Grinstein, S; Weber, N; Suffert, Martin; Hof, M; Kremer, J; Menn, W; Simon, M; Stephens, S A; Ambriola, M; Bellotti, R; Cafagna, F; Castellano, M G; Ciacio, F; Circella, M; De Marzo, C; Finetti, N; Papini, P; Piccardi, S; Spillantini, P; Bartalucci, S; Ricci, M; Bidoli, V; Casolino, M; De Pascale, M P; Morselli, A; Picozza, P; Sparvoli, R; Barbiellini, Guido; Schiavon, R P; Vacchi, A; Zampa, N; Mitchell, J W; Ormes, J F; Streitmatter, R E; Bravar, U; Stochaj, S J

    2001-01-01

    A RICH counter using a gas radiator of C/sub 4/F/sub 10/ and a photosensitive MWPC with pad readout has been developed, tested in particle beam at CERN and used in the CAPRICE98 balloon-borne experiment. The MWPC was operated with a TMAE and ethane mixture at atmospheric pressure and used a cathode pad plane to give an unambiguous image of the Cherenkov light. The induced signals in the pad plane were read our using the AMPLEX chip and CRAMS. The good efficiency of the Cherenkov light collection, the efficient detection of the weak signal from single UV photons together with a low noise level in the electronics of the RICH detector, resulted in a large number of detected photoelectrons per event. For beta approximately=1 charge one particles, an average of 12 photoelectrons per event were detected. The reconstructed Cherenkov angle of 50 mrad for a beta approximately=1 particle had a resolution of 1.2 mrad (rms). The RICH was flown with the CAPRICE98 magnetic spectrometer and was the first RICH counter ever u...

  4. Status of the NASA Balloon Program

    Science.gov (United States)

    Needleman, H. C.; Nock, R. S.; Bawcom, D. W.

    1993-01-01

    The NASA Balloon Program (BP) is examined in an overview of design philosophy, R&D activities, flight testing, and the development of a long-duration balloon for Antarctic use. The Balloon Recovery Program was developed to qualify the use of existing films and to design improved materials and seals. Balloon flights are described for studying the supernova SN1987a, and systems were developed to enhance balloon campaigns including mobile launch vehicles and tracking/data-acquisition systems. The technical approach to long-duration ballooning is reviewed which allows the use of payloads of up to 1350 kg for two to three weeks. The BP is responsible for the development of several candidate polyethylene balloon films as well as design/performance standards for candidate balloons. Specific progress is noted in reliability and in R&D with respect to optimization of structural design, resin blending, and extrusion.

  5. The Antarctic Impulsive Transient Antenna ultra-high energy neutrino detector: Design, performance, and sensitivity for 2006-2007 balloon flight

    Energy Technology Data Exchange (ETDEWEB)

    Gorham, P. W. [Univ. of Hawaii, Manoa, HI (United States); Allison, P. [Univ. of Hawaii, Manoa, HI (United States); Barwick, S. W. [Univ. of California, Irvine, CA (United States); Beatty, J. J. [The Ohio State Univ., Columbus, OH (United States); Besson, D. Z. [Univ. of Kansas, Lawrence, KS (United States); Binns, W. R. [Washington Univ., St. Louis, MO (United States); Chen, C. [SLAC National Accelerator Lab., Menlo Park, CA (United States); Chen, P. [SLAC National Accelerator Lab., Menlo Park, CA (United States); NASA Goddard Space Flight Center, Greenbelt, MD (United States); Clem, J. M. [Univ. of Delaware, Newark, DE (United States); Connolly, A. [Univ. College London, London (United Kingdom); Dowkontt, P. F. [Washington Univ., St. Louis, MO (United States); DuVernois, M. A. [Univ. of Minnesota, Minneapolis, MN (United States); Field, R. C. [SLAC National Accelerator Lab., Menlo Park, CA (United States); Goldstein, D. [Univ. of California, Irvine, CA (United States); Goodhue, A. [Univ. of California, Los Angeles, CA (United States); Hast, C. [SLAC National Accelerator Lab., Menlo Park, CA (United States); Hebert, C. L. [Univ. of Hawaii, Manoa, HI (United States); Hoover, S. [Univ. of California, Los Angeles, CA (United States); Israel, M. H. [Washington Univ., St. Louis, MO (United States); Learned, J. G. [Univ. of Hawaii, Manoa, HI (United States). et al.

    2009-05-23

    In this article, we present a comprehensive report on the experimental details of the Antarctic Impulsive Transient Antenna (ANITA) long-duration balloon payload, including the design philosophy and realization, physics simulations, performance of the instrument during its first Antarctic flight completed in January of 2007, and expectations for the limiting neutrino detection sensitivity.

  6. Is kyphoplasty better than vertebroplasty at restoring form and function after severe vertebral wedge fractures?

    Science.gov (United States)

    Landham, Priyan R; Baker-Rand, Holly L A; Gilbert, Samuel J; Pollintine, Phillip; Annesley-Williams, Deborah J; Adams, Michael A; Dolan, Patricia

    2015-04-01

    The vertebral augmentation procedures, vertebroplasty and kyphoplasty, can relieve pain and facilitate mobilization of patients with osteoporotic vertebral fractures. Kyphoplasty also aims to restore vertebral body height before cement injection and so may be advantageous for more severe fractures. The purpose of this study was to compare the ability of vertebroplasty and kyphoplasty to restore vertebral height, shape, and mechanical function after severe vertebral wedge fractures. This is a biomechanical and radiographic study using human cadaveric spines. Seventeen pairs of thoracolumbar "motion segments" from cadavers aged 70-98 years were injured, in a two-stage process involving flexion and compression, to create severe anterior wedge fractures. One of each pair underwent vertebroplasty and the other kyphoplasty. Specimens were then compressed at 1 kN for 1 hour to allow consolidation. Radiographs were taken before and after injury, after treatment, and after consolidation. At these same time points, motion segment compressive stiffness was assessed, and intervertebral disc "stress profiles" were obtained to characterize the distribution of compressive stress on the vertebral body and neural arch. On average, injury reduced anterior vertebral body height by 34%, increased its anterior wedge angle from 5.0° to 11.4°, reduced intradiscal (nucleus) pressure and motion segment stiffness by 96% and 44%, respectively, and increased neural arch load bearing by 57%. Kyphoplasty caused 97% of the anterior height loss to be regained immediately, although this reduced to 79% after consolidation. Equivalent gains after vertebroplasty were significantly lower: 59% and 47%, respectively (pconsolidation, but these mechanical effects were similar for kyphoplasty and vertebroplasty. After severe vertebral wedge fractures, vertebroplasty and kyphoplasty were equally effective in restoring mechanical function. However, kyphoplasty was better able to restore vertebral height

  7. Comparison of effectiveness of kyphoplasty and vertebroplasty in patients with osteoporotic vertebra fractures

    OpenAIRE

    Ahmet Ateş; Halil Can Gemalmaz; Mehmet Ali Deveci; Sezai Aykın Şimşek; Engin Çetin; Alpaslan Şenköylü

    2016-01-01

    Objective: The aim of this study was to compare the functional and radiological outcomes of vertebroplasty and kyphoplasty in patients with osteoporotic vertebra fractures. Methods: The files of the patients who underwent vertebroplasty or kyphoplasty for osteoporotic vertebrae fractures were retrieved from the archives. Forty-three patients with complete follow-up data were included in the study group. The patients were evaluated for radiological outcomes in terms of local kyphosis angle,...

  8. Die Kyphoplastie als Revisionseingriff bei Auslockerung eines Fixateurs interne bei Osteoporose

    Directory of Open Access Journals (Sweden)

    Becker S

    2004-01-01

    Full Text Available Kyphoplastie ist eine moderne minimal-invasive Methode zur Stabilisation von osteoporotischen Wirbelfrakturen. Bei einigen osteoporotischen Patienten kann aber eine offene Stabilisation mit Fixateur interne notwendig werden. Aufgrund des osteoporotischen Knochens sind diese Eingriffe mit einem hohen Schraubenauslockerungsrisiko behaftet. Wir demonstrieren diesbezüglich 3 verschiedene Techniken zur Stabilisierung einer osteoporotischen Wirbelsäule nach Schraubenausbruch: die transpedikuläre Kyphoplastie nach Schraubenentfernung, die kyphoplastische Schraubenaugmentationsmethode und die kyphoplastische Abstützungsmethode.

  9. Die minimalinvasive chirurgische Versorgung osteoporotischer Wirbelfrakturen mit Vertebroplastie und Kyphoplastie

    Directory of Open Access Journals (Sweden)

    Becker S

    2004-01-01

    Full Text Available Osteoporotische Wirbeleinbrüche sind eine bekannte Komplikation mit weitreichenden Konsequenzen, die letztendlich eine der Schenkelhalsfraktur ähnliche Mortalität aufweist. Deshalb sind frühestmögliche Therapien notwendig. In den letzten Jahren haben sich hier zwei minimal-invasive Therapieformen, die Vertebroplastie und die Kyphoplastie, etabliert. Durch diese risikoarmen Eingriffe können nicht nur Schmerzen deutlich vermindert werden, sondern auch eine Frühmobilisation der Patienten erreicht werden, was entscheidend die Prognose nach Wirbelfraktur verbessert. Dieser Artikel zeigt Vor- und Nachteile beider Techniken und berichtet über die erfreulich guten Resultate. Entscheidend für ein optimales postoperatives Resultat sind jedoch frühe Diagnosestellung und Intervention.

  10. Postoperative change in sagittal balance after Kyphoplasty for the treatment of osteoporotic vertebral compression fracture.

    Science.gov (United States)

    Yokoyama, Kunio; Kawanishi, Masahiro; Yamada, Makoto; Tanaka, Hidekazu; Ito, Yutaka; Kawabata, Shinji; Kuroiwa, Toshihiko

    2015-04-01

    The influence of vertebral cement augmentation on spinal sagittal balance is unknown. The present study aimed to analyze the changes in total spinal alignment after Kyphoplasty in VCF patients. The study involved 21 VCF patients who underwent Kyphoplasty. In all patients, lateral radiographs of the entire spine were taken preoperatively and 1 month after surgery, to measure the pelvic incidence (PI), sacral slope (SS), pelvic tilt (PT), lumbar lordosis (LL), sagittal vertical axis (SVA), and spinosacral angle (SSA). These parameters were compared between VCF patients and 30 healthy volunteers. In VCF patients, the parameters were compared before and after Kyphoplasty. In VCF patients, preoperative SVA was 7.00 ± 3.9 cm, showing a significant shift to anterior sagittal balance as compared to the healthy group (1.45 ± 2.7 cm) (P vertebra (r = 0.792, P < 0.01). VAS score decreased from 7.98 ± 1.8 before Kyphoplasty to 2.38 ± 2.3 postoperatively (P < 0.0001). Total spinal alignment is shifted to anterior sagittal balance in VCF patients. Kyphoplasty plays a role not only in reducing pain associated with fractures but also in improving sagittal imbalance in the treatment of painful vertebral compression fracture.

  11. Balloon dilatation of iatrogenic urethral strictures

    International Nuclear Information System (INIS)

    Acunas, B.; Acunas, G.; Gokmen, E.; Celik, L.

    1988-01-01

    Balloon dilatation of the urethra was performed in five patients with iatrogenic urethral strictures. The urethral strictures were successfully negotiated and dilated in all patients. Redilatation became necessary in a period ranging from 3 to 10 months. The authors believe that balloon dilatation of the urethra can be safely and successfully performed; the procedure produces minimal trauma and immediate relief of symptoms. (orig.)

  12. Kyphoplasty combined with intraoperative radiotherapy (Kypho-IORT). Alternative therapy for patients with oligometastatic spinal metastases; Kyphoplastie kombiniert mit intraoperativer Radiotherapie (Kypho-IORT). Therapiealternative fuer den oligometastasierten Patienten mit Wirbelsaeulenmetastasen

    Energy Technology Data Exchange (ETDEWEB)

    Bludau, F.; Obertacke, U. [Universitaetsklinikum Mannheim, Med. Fakultaet Mannheim der Universitaet Heidelberg, Orthopaedisch-Unfallchirurgisches Zentrum, Mannheim (Germany); Reis, T.; Schneider, F.; Clausen, S.; Wenz, F. [Universitaetsklinikum Mannheim, Med. Fakultaet Mannheim der Universitaet Heidelberg, Klinik fuer Strahlentherapie und Radioonkologie, Mannheim (Germany)

    2015-10-15

    Due to a more effective systemic therapy the survival of patients suffering from malignant tumors has been significantly improved but a longer life span is often associated with a higher incidence of osseous metastases. The majority of these metastases are localized in the spine causing pain, instability and neurological impairments. The interdisciplinary management of spinal metastases previously consisted of stabilization followed by fractionated external body radiation therapy. A reduction in procedural severity and morbidity as well as consideration of self-sufficiency and hospitalization time are important target parameters for these palliative patients. Kyphoplasty combined with intraoperative radiotherapy (Kypho-IORT) is one of several modern treatment options, which involves a minimally invasive procedure with local high-dose transpedicular irradiation of the spine with low-energy (50 kV) X-rays. Immediately following irradiation, stabilization of the spine is carried out using kyphoplasty via the same access route so that a single stage procedure with excellent pain reduction and good local tumor control can be achieved. This article presents clinical data for this procedure and the different fields of indications are critically reviewed and compared to other therapy options. Methodological improvements and options for further individualization of therapy are demonstrated. The Kypho-IORT procedure is a safe, feasible and beneficial modern treatment option for instant stabilization and local tumor control in patients with spinal metastases. More than 100 operations have been successfully performed so that the method can be deemed suitable for inclusion in the clinical routine. A phase II dose escalation study has now been completed and submitted for publication and a 2-arm non-inferiority trial (phase III study) for comparison with conventional irradiation is in progress. (orig.) [German] Durch verbesserte onkologische Therapie kommt es nicht nur zu einer

  13. Theoretical and actual performance of a long duration superpressure balloon made from a biaxially oriented nylon-6-film

    Science.gov (United States)

    Lew, T.; Seely, L.; Rai, R.

    1994-02-01

    This paper summarizes the information gained during Winzen's program to develop a practical long duration superpressure balloon capable of carrying a 22.7 kilogram payload at 36.6 kilometers for a over a year. The material used for this Superpressure Stratospheric Vehicle (SSV) is biaxially oriented nylon-6. An allowable design stress as a function of temperature has been developed. A cold temperature creep model for the nylon-6 has been developed. Permeability of nylon-6 to helium has been measured and the results indicate that this material is an excellent gas barrier, especially at cold temperatures. The transmissivity and reflectivity of this biaxially oriented nylon-6 has also been measured. A balloon prototype made with a pressure sensitive adhesive tape has been fabricated and successfully flown.

  14. VVER ballooning experiments

    International Nuclear Information System (INIS)

    Gyoeri, Cs.; Hozer, Z.; Maroti, L.; Matus, L.

    1998-01-01

    A series of ballooning experiments was performed at the KFKI-AEKI in order to compare the mechanical behaviour and strength of Zircaloy-4 and Zr1%Nb claddings. The effects of temperature, oxidation and iodine absorption on deformation and burst pressure was investigated in almost 100 biaxial tests. Numerical post-test analyses have also been performed with the stand-alone fuel module of the French CATHARE code and the US fuel behaviour code FRAP-T6. Comparing the experimental and the analytical results, relevant differences of high temperature strength due to different α-β phase transition temperature were revealed between the investigated cladding materials. (author)

  15. Current trends of balloon laryngoplasty in Thailand.

    Science.gov (United States)

    Moungthong, Greetha; Bunbanjerdsuk, Sacarin; Wright, Nida; Sathavornmanee, Thanakrit; Setabutr, Dhave

    2017-06-01

    To describe the current trend in balloon laryngoplasty usage and experience by practicing otolaryngologists in Thailand. Anonymous 11 question online and paper survey of otolaryngologists on their current balloon laryngoplasty practices. Current practices and experience in balloon laryngoplasty were queried with multiple choice and open-ended questions. Laser use is the most commonly utilized instrument to treat airway stenosis in Thailand. 86% of respondents do not have experience with balloon dilatation; yet, almost half (47.6%) report they perform a minimum of five airway surgeries per year. Most respondents had been in practice for less than 6 years (41%) and reported that they did not have exposure to balloon use during residency training. The largest barrier reported for the use of balloon instrumentation in the airway is inexperience (44.4%) followed by cost (38.3%), yet most feel that treatment in airway stenosis could benefit by usage of balloons (95.5%). Most otolaryngologists in Thailand do not have experience with the use of balloon dilatation and lack of exposure remains the largest barrier to its use. Otolaryngologists in Thailand feel that increased usage of balloons in the airway could improve airway stenosis treatment in the country.

  16. Correlating coating characteristics with the performance of drug-coated balloons--a comparative in vitro investigation of own established hydrogel- and ionic liquid-based coating matrices.

    Directory of Open Access Journals (Sweden)

    Sebastian Kaule

    Full Text Available Drug-coated balloons (DCB, which have emerged as a therapeutic alternative to drug-eluting stents in percutaneous cardiovascular intervention, are well described with regard to clinical efficacy and safety within a number of clinical studies. In vitro studies elucidating the correlation between coating additive and DCB performance are however rare but considered important for the understanding of DCB requirements and the improvement of established DCB. In this regard, we examined three different DCB-systems, which were developed in former studies based on the ionic liquid cetylpyridinium salicylate, the body-own hydrogel hyaluronic acid and the pharmaceutically well-established hydrogel polyvinylpyrrolidone, considering coating morphology, coating thickness, drug-loss, drug-transfer to the vessel wall, residual drug-concentration on the balloon surface and entire drug-load during simulated use in an in vitro vessel model. Moreover, we investigated particle release of the different DCB during simulated use and determined the influence of the three coatings on the mechanical behavior of the balloon catheter. We could show that coating characteristics can be indeed correlated with the performance of DCB. For instance, paclitaxel incorporation in the matrix can reduce the drug wash-off and benefit a high drug transfer. Additionally, a thin coating with a smooth surface and high but delayed solubility can reduce drug wash-off and decrease particle burden. As a result, we suggest that it is very important to characterize DCB in terms of mentioned properties in vitro in addition to their clinical efficacy in order to better understand their function and provide more data for the clinicians to improve the tool of DCB in coronary angioplasty.

  17. Correlating Coating Characteristics with the Performance of Drug-Coated Balloons – A Comparative In Vitro Investigation of Own Established Hydrogel- and Ionic Liquid-Based Coating Matrices

    Science.gov (United States)

    Kaule, Sebastian; Minrath, Ingo; Stein, Florian; Kragl, Udo; Schmidt, Wolfram; Schmitz, Klaus-Peter; Sternberg, Katrin; Petersen, Svea

    2015-01-01

    Drug-coated balloons (DCB), which have emerged as a therapeutic alternative to drug-eluting stents in percutaneous cardiovascular intervention, are well described with regard to clinical efficacy and safety within a number of clinical studies. In vitro studies elucidating the correlation between coating additive and DCB performance are however rare but considered important for the understanding of DCB requirements and the improvement of established DCB. In this regard, we examined three different DCB-systems, which were developed in former studies based on the ionic liquid cetylpyridinium salicylate, the body-own hydrogel hyaluronic acid and the pharmaceutically well-established hydrogel polyvinylpyrrolidone, considering coating morphology, coating thickness, drug-loss, drug-transfer to the vessel wall, residual drug-concentration on the balloon surface and entire drug-load during simulated use in an in vitro vessel model. Moreover, we investigated particle release of the different DCB during simulated use and determined the influence of the three coatings on the mechanical behavior of the balloon catheter. We could show that coating characteristics can be indeed correlated with the performance of DCB. For instance, paclitaxel incorporation in the matrix can reduce the drug wash-off and benefit a high drug transfer. Additionally, a thin coating with a smooth surface and high but delayed solubility can reduce drug wash-off and decrease particle burden. As a result, we suggest that it is very important to characterize DCB in terms of mentioned properties in vitro in addition to their clinical efficacy in order to better understand their function and provide more data for the clinicians to improve the tool of DCB in coronary angioplasty. PMID:25734818

  18. Structure variations of pumpkin balloon

    Science.gov (United States)

    Yajima, N.; Izutsu, N.; Honda, H.

    2004-01-01

    A lobed pumpkin balloon by 3-D gore design concept is recognized as a basic form for a super-pressure balloon. This paper deals with extensions of this design concept for other large pressurized membrane structures, such as a stratospheric airship and a balloon of which volume is controllable. The structural modifications are performed by means of additional ropes, belts or a strut. When the original pumpkin shape is modified by these systems, the superior characteristics of the 3-D gore design, incorporating large bulges with a small local radius and unidirectional film tension, should be maintained. Improved design methods which are adequate for the above subjects will be discussed in detail. Application for ground structures are also mentioned.

  19. [Coronary angioplasty using double balloon in artery of large calibre (hugging balloons)].

    Science.gov (United States)

    Centemero, M P; Cano, M N; Maldonado, G; de Almeida, J D; Sousa, A G; Sousa, J E

    1993-07-01

    In this case report the transluminal coronary angioplasty was performed in a oversized right coronary artery with a severe lesion with thrombus inside, using the Hugging balloon technique (two dilatation balloon catheters used simultaneously). This technique achieved minimal residual lesion and had a favorable clinical outcome of the patient.

  20. Cancer risk coefficient for patient undergoing kyphoplasty surgery using Monte Carlo method

    Science.gov (United States)

    Santos, Felipe A.; Santos, William S.; Galeano, Diego C.; Cavalcante, Fernanda R.; Silva, Ademir X.; Souza, Susana O.; Júnior, Albérico B. Carvalho

    2017-11-01

    Kyphoplasty surgery is widely used for pain relief in patients with vertebral compression fracture (VCF). For this surgery, an X-ray emitter that provides real-time imaging is employed to guide the medical instruments and the surgical cement used to fill and strengthen the vertebra. Equivalent and effective doses related to high temporal resolution equipment has been studied to assess the damage and more recently cancer risk. For this study, a virtual scenario was prepared using MCNPX code and a pair of UF family simulators. Two projections with seven tube voltages for each one were simulated. The organ in the abdominal region were those who had higher cancer risk because they receive the primary beam. The risk of lethal cancer is on average 20% higher in AP projection than in LL projection. This study aims at estimating the risk of cancer in organs and the risk of lethal cancer for patient submitted to kyphoplasty surgery.

  1. Balloon Command-Control

    Science.gov (United States)

    1977-01-07

    Continuo on reverse side Ii nocosom7’ and identify by block numnber) P cientific Balloons; Balloon flights; Telemetry; Balloon Control; plight Termination... improvements in the ground station which should result in a truly simplified operation. The final modification to the decoder board which appears... improve the sweep range nnd sweep rate, however, the wave shape is still not as good as achieved using an exter..al sine wave oscillator manually

  2. Percutaneous kyphoplasty and pedicle screw fixation for the management of thoraco-lumbar burst fractures

    OpenAIRE

    Fuentes, Stéphane; Blondel, Benjamin; Metellus, Philippe; Gaudart, Jean; Adetchessi, Tarek; Dufour, Henry

    2010-01-01

    The study design includes prospective evaluation of percutaneous osteosynthesis associated with cement kyphoplasty on 18 patients. The objective of the study is to assess the efficacy of a percutaneous method of treating burst vertebral fractures in patients without neurological deficits. Even if burst fractures are frequent, no therapeutic agreement is available at the moment. We report in this study the results at 2 years with a percutaneous approach for the treatment of burst fractures. 18...

  3. First experience using navigation-guided radiofrequency kyphoplasty for sacroplasty in sacral insufficiency fractures

    Energy Technology Data Exchange (ETDEWEB)

    Klingler, J.H.; Kluge, P.; Sircar, R.; Kogias, E.; Scholz, C.; Krueger, M.T.; Scheiwe, C.; Hubbe, U. [Freiburg Univ. Medical Center, Freiburg (Germany). Dept. of Neurosurgery

    2013-08-15

    Purpose: To evaluate the efficacy and safety of navigation-guided radiofrequency kyphoplasty for sacroplasty in patients with sacral insufficiency fractures. Methods: In this single-center retrospective observational study, four consecutive patients with sacral insufficiency fractures were treated with navigation-guided radiofrequency kyphoplasty for sacroplasty between April 2010 and May 2012. Symptom characteristics, pain duration and pain intensity were recorded for each patient. Cement extravasation was evaluated in thin-sliced and triplanar reconstructed CT scans of the sacrum. Results: Four female patients with painful sacral insufficiency fractures and extensive osteopenic areas significantly improved from an average pre-treatment VAS score of 8.3 {+-} 0.5 to 2.3 {+-} 1.0 (p < 0.001) on the first postoperative day and to 1.3 {+-} 1.9 (p < 0.004) at follow-up (mean, 20.1 weeks). Slight cement extravasations were observed without evidence of being symptomatic. No major complications or procedure-related morbidity were noted. Conclusion: From the limited experience in four patients, navigation-guided radiofrequency kyphoplasty appears to be a safe and effective treatment option for sacral insufficiency fractures even though asymptomatic cement extravasation was noted. The use of navigation based on intraoperative 3 D images simplifies the positioning of the navigated bone needles via the long axis approach. The radiofrequency kyphoplasty system provides the possibility to administer a sufficient amount of bone cement with a well-defined viscosity over the entire period of the procedure leading to high security and low cement extravasation. Sacroplasty provides rapid and enduring pain relief and facilitates prompt mobilization. (orig.)

  4. Weather Balloon Ascent Rate

    Science.gov (United States)

    Denny, Mark

    2016-05-01

    The physics of a weather balloon is analyzed. The surprising aspect of the motion of these balloons is that they ascend to great altitudes (typically 35 km) at a more or less constant rate. Such behavior is not surprising near the ground—say for a helium-filled party balloon rising from street level to the top of the Empire State building—but it is unexpected for a balloon that rises to altitudes where the air is rarefied. We show from elementary physical laws why the ascent rate is approximately constant.

  5. Pain and functional outcome after vertebroplasty and kyphoplasty. A comparative study

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz Santiago, Fernando, E-mail: ferusan@ono.co [Department of Radiology, Hospital of Traumatology (Ciudad Sanitaria Virgen de las Nieves), Carretera de Jaen SN, 18014 Granada (Spain); Perez Abela, Antonio [Department of Traumatology, Hospital of Traumatology (Ciudad Sanitaria Virgen de las Nieves), Carretera de Jaen SN, 18014 Granada (Spain); Guzman Alvarez, Luis [Department of Radiology, Hospital of Traumatology (Ciudad Sanitaria Virgen de las Nieves), Carretera de Jaen SN, 18014 Granada Spain (Spain); Alvarez Osuna, Rosa Maria [Department of Traumatology, Hospital of Traumatology (Ciudad Sanitaria Virgen de las Nieves), Carretera de Jaen SN, 18014 Granada (Spain); Mar Castellano Garcia, Maria del [Department of Radiology, Hospital of Traumatology (Ciudad Sanitaria Virgen de las Nieves), Carretera de Jaen SN, 18014 Granada (Spain)

    2010-08-15

    Purpose: The aim of this study was to compare the effectiveness of percutaneous vertebroplasty and kyphoplasty to treat pain from non-neoplastic vertebral fractures and improve functional outcomes. Materials and methods: We compared 30 patients treated by vertebroplasty for non-neoplastic vertebral fractures with 30 patients treated by kyphoplasty for the same condition. Pain was measured with a visual analogue scale (VAS) and functional outcome with the Oswestry disability index (ODI). Baseline data were compared with measurements on the day after the procedure (for pain alone) and at 1 month, 6 months, and 1 year. Results: The VAS pain score was reduced by 4-5 points on the day after either type of treatment, a statistically significant improvement. The global ODI was significantly improved (by 13-18 points) at 1 month after either procedure. These improvements persisted at 6 months and 1 year. No significant differences in functional outcome were observed between the techniques. Conclusion: Vertebroplasty and kyphoplasty obtain similar improvements in pain and functional outcomes in these patients. The choice of technique must therefore depend on other factors. An initial improvement with either technique is a good predictor of long-term improvement.

  6. Calibration and performance studies of the balloon-borne hard X-ray polarimeter PoGO+

    Science.gov (United States)

    Chauvin, M.; Friis, M.; Jackson, M.; Kawano, T.; Kiss, M.; Mikhalev, V.; Ohashi, N.; Stana, T.; Takahashi, H.; Pearce, M.

    2017-07-01

    Polarimetric observations of celestial sources in the hard X-ray band stand to provide new information on emission mechanisms and source geometries. PoGO+ is a Compton scattering polarimeter (20-150 keV) optimised for the observation of the Crab (pulsar and wind nebula) and Cygnus X-1 (black hole binary), from a stratospheric balloon-borne platform launched from the Esrange Space Centre in summer 2016. Prior to flight, the response of the polarimeter has been studied with polarised and unpolarised X-rays allowing a Geant4-based simulation model to be validated. The expected modulation factor for Crab observations is found to be MCrab = (41.75 ± 0.85) % , resulting in an expected Minimum Detectable Polarisation (MDP) of 7.3% for a 7 day flight. This will allow a measurement of the Crab polarisation parameters with at least 5 σ statistical significance assuming a polarisation fraction ∼ 20 % - a significant improvement over the PoGOLite Pathfinder mission which flew in 2013 and from which the PoGO+ design is developed.

  7. Stability of pedicle screws after kyphoplasty augmentation: an experimental study to compare transpedicular screw fixation in soft and cured kyphoplasty cement.

    Science.gov (United States)

    Linhardt, Oliver; Lüring, Christian; Matussek, Jan; Hamberger, Corinna; Plitz, Wolfgang; Grifka, Joachim

    2006-04-01

    The goal of this cadaver study was to compare the stability of pedicle screws after implantation in soft or cured kyphoplasty cement. Pedicle screws were inserted in a total of 30 thoracolumbar vertebrae of 10 different human specimens: 10 screws were implanted in nonaugmented vertebrae (group 1), each 10 screws were placed in soft (group 2) and cured (group 3) cement. Pedicle screws were than evaluated for biomechanical axial pullout resistance. Mean axial pullout strength was 232 N (range 60-600 N) in group 1, 452 N (range 60-1125 N) in group 2 and 367 N (range 112-840 N) in group 3. The paired Student t-test demonstrated a significant difference between pullout strength of groups 1 and 2 (P = 0.0300). Between pullout strength of groups 1 and 3 and between groups 2 and 3 no significant difference was seen. We achieved a 1.9 times higher pullout strength with kyphoplasty augmentation of osteoporotic vertebrae compared with the pullout strength of nonaugmented vertebrae. Implantation of pedicle screws in cured cement is a sufficient method. With this method we found a 1.6 times higher pullout strength then in nonaugmented vertebrae.

  8. In vitro analysis of balloon cuffing phenomenon: inherent biophysical properties of catheter material or mechanics of catheter balloon deflation?

    Science.gov (United States)

    Chung, Eric; So, Karina

    2012-06-01

    To investigates the different methods of balloon deflation, types of urinary catheters and exposure to urine media in catheter balloon cuffing. Bardex®, Bard-Lubri-Sil®, Argyle®, Releen® and Biocath® were tested in sterile and E.Coli inoculated urine at 0, 14 and 28 days. Catheter deflation was performed with active deflation; passive deflation; passive auto-deflation; and excision of the balloon inflow channel. Balloon cuffing was assessed objectively by running the deflated balloon over a plate of agar and subjectively by 3 independent observers. Bardex®, Argyle® and Biocath® showed greater degree of catheter balloon cuffing (p deflation was the worst method (p 0.05). Linear regression model analysis confirmed time as the most significant factor. The duration of catheters exposure, different deflation methods and types of catheters tested contributed significantly to catheter balloon cuffing (p < 0.01).

  9. Advanced Li batteries for terrestrial balloons, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — For future advanced terrestrial balloon missions, NASA requires energy dense and power dense energy storage solutions significantly exceeding the performance of...

  10. The Japanese Balloon Program

    Science.gov (United States)

    Nishimura, J.

    The Japanese scientific ballooning program has been organized by ISAS since the institute was founded in mid 1960s. Since then, the balloon group of ISAS has been engaged in the development of the balloon technologies and scientific observations in collaboration with scientists and engineers in other universities and organizations. Here, I describe several subjects of recent activities, the details of some items will also be reported in the separate papers in this meeting.Preparation of a new mobile receiving station.Balloons of made of the EVAL (Ethylene-Vinyl-Alcohol) films. EVAL film has specific Infra-red absorption bands, and is expected to be useful for saving the ballast for a long duration flight.A high altitude balloon with thin polyethylene films achieving at an altitude of above 50km. Further improvement of this type of balloons is continued by inventing how to extrude thin films less than 5 microns of thickness.Recent achievement of Antarctica Flights under the collaboration of ISAS and National Polar Institute.Other new efforts to long duration flights such as satellite link boomerang balloon systems and others.New balloon borne scientific instrumentation for observations of high energy electrons and Anti-protons in cosmic-rays.

  11. Clefting in pumpkin balloons

    Science.gov (United States)

    Baginski, F.; Schur, W.

    NASA's effort to develop a large payload, high altitude, long duration balloon, the Ultra Long Duration Balloon, focuses on a pumpkin shape super-pressure design. It has been observed that a pumpkin balloon may be unable to pressurize into the desired cyclically symmetric equilibrium configuration, settling into a distorted, undesired stable state instead. Hoop stress considerations in the pumpkin design leads to choosing the lowest possible bulge radius, while robust deployment is favored by a large bulge radius. Some qualitative understanding of design aspects on undesired equilibria in pumpkin balloons has been obtained via small-scale balloon testing. Poorly deploying balloons have clefts, but most gores away from the cleft deploy uniformly. In this paper, we present models for pumpkin balloons with clefts. Long term success of the pumpkin balloon for NASA requires a thorough understanding of the phenomenon of multiple stable equilibria and means for quantitative assessment of measures that prevent their occurrence. This paper attempts to determine numerical thresholds of design parameters that distinguish between properly deploying designs and improperly deploying designs by analytically investigating designs in the vicinity of criticality. Design elements which may trigger the onset undesired equilibria and remedial measures that ensure deployment are discussed.

  12. Modified Hydrogen Balloon Explosion.

    Science.gov (United States)

    Lawrence, Stephen S.

    1995-01-01

    Describes the technique of exploding an oxygen-hydrogen balloon using two balloons and having students observe the formation of water droplets. Suggests that the Socratic Method can be used to start discussions related to stochiometry, states of matter, and gas laws. (DDR)

  13. Revision of the failed pedicle screw in osteoporotic lumbar spine: biomechanical comparison of kyphoplasty versus transpedicular polymethylmethacrylate augmentation.

    Science.gov (United States)

    Derinçek, Alihan; Türker, Mehmet; Cinar, Murat; Cetik, Ozgür; Kalaycioğlu, Bariş

    2012-01-01

    In this study, we aimed to compare of kyphoplasty versus transpedicular polymethylmethacrylate (PMMA) augmentation biomechanically in the revision of the failed pedicle screw in osteoporotic lumbar spine. Bone mineral density (BMD) of lumbar vertebrae collected from four bovines were measured. Each vertebra was decalcified with hydrochloric acid solution to obtain osteoporotic specimens. Primary polyaxial pedicle screws were inserted into the pedicles and pulled out until they failed. The pullout strength results of all specimens were recorded. Revision pedicle screws were randomly inserted into the same pedicles by either pedicle hole PMMA augmented (group 1) or kyphoplasty (Xvoid™) PMMA augmented pedicle screws (group 2). The pullout strength results of all specimens were re-recorded. The mean BMD significantly decreased from 1.686 ± 227.9 g/cm(2) to 1.432 ± 157.1 g/cm(2) following decalcification (posteoporotic bone, kyphoplasty augmented pedicle screw seems to be more effective method increasing the pullout strength.

  14. Left ventricular apical ballooning syndrome

    International Nuclear Information System (INIS)

    Rahman, N.; Tai, J.; Soofi, A.

    2007-01-01

    The transient left ventricular apical ballooning syndrome, also known as Takotsubo cardiomyopathy, is characterized by transient left ventricular dysfunction in the absence of obstructive epicardial coronary disease. Although the syndrome has been reported in Japan since 1990, it is rare in other regions. Rapid recognition of the syndrome can modify the diagnostic and therapeutic attitude i.e. avoiding thrombolysis and performing catheterization in the acute phase. (author)

  15. Deployment Instabilities of Lobed-Pumpkin Balloon

    Science.gov (United States)

    Nakashino, Kyoichi

    A lobed-pumpkin balloon, currently being developed in ISAS/JAXA as well as in NASA, is a promising vehicle for long duration scientific observations in the stratosphere. Recent ground and flight experiments, however, have revealed that the balloon has deployment instabilities under certain conditions. In order to overcome the instability problems, a next generation SPB called 'tawara' type balloon has been proposed, in which an additional cylindrical part is appended to the standard lobed-pumpkin balloon. The present study investigates the deployment stability of tawara type SPB in comparison to that of standard lobed-pumpkin SPB through eigenvalue analysis on the basis of finite element methods. Our numerical results show that tawara type SPB enjoys excellent deployment performance over the standard lobed-pumpkin SPBs.

  16. Comparison of percutaneous vertebroplasty and percutaneous kyphoplasty for the management of Kümmell's disease: A retrospective study.

    Science.gov (United States)

    Zhang, Guang-Quan; Gao, Yan-Zheng; Chen, Shu-Lian; Ding, Shuai; Gao, Kun; Wang, Hong-Qiang

    2015-01-01

    Post traumatic osteonecrosis of a vertebral body occurring in a delayed fashion was first described by the German doctor Kümmell in 1895. Several studies have reported percutaneous vertebroplasty (PVP), or percutaneous kyphoplasty (PKP) for Kümmell's disease achieves good outcomes. However, it is unknown whether a technique is superior for the treatment of this disease. The objective of the study is to compare the efficacy of PVP and PKP for the treatment of Kümmell's disease. A retrospective review was conducted for 73 patients with Kümmell's disease. PVP was performed in 38 patients and PKP in 35 patients. Visual analogue score (VAS) was used to evaluate pain. The anterior vertebral height was measured. The operative time, the incidence of cement leakage and the costs were recorded. In both PVP group and PKP group, the VAS and anterior vertebral height significantly improved at 1-day postoperatively (P 0.05). Between the PVP and PKP groups, there were no significant differences in VAS and the anterior vertebral height at 1-day postoperatively and at the final followup (P > 0.05). The operating time and expense in the PKP group were higher than the PVP group (P pain relief and restoration of vertebral height to PKP for the treatment of Kümmell's disease. PKP has a significant advantage over PVP in term of the fewer cement leakages.

  17. PEBS - Positron Electron Balloon Spectrometer

    CERN Document Server

    von Doetinchem, P.; Kirn, T.; Yearwood, G.Roper; Schael, S.

    2007-01-01

    The best measurement of the cosmic ray positron flux available today was performed by the HEAT balloon experiment more than 10 years ago. Given the limitations in weight and power consumption for balloon experiments, a novel approach was needed to design a detector which could increase the existing data by more than a factor of 100. Using silicon photomultipliers for the readout of a scintillating fiber tracker and of an imaging electromagnetic calorimeter, the PEBS detector features a large geometrical acceptance of 2500 cm^2 sr for positrons, a total weight of 1500 kg and a power consumption of 600 W. The experiment is intended to measure cosmic ray particle spectra for a period of up to 20 days at an altitude of 40 km circulating the North or South Pole. A full Geant 4 simulation of the detector concept has been developed and key elements have been verified in a testbeam in October 2006 at CERN.

  18. Kyphoplasty via unilateral extrapedicular approach for the treatment of osteoporotic thoracic compression fractures

    International Nuclear Information System (INIS)

    Zhou Feng; Yang Huilin; Gan Minfeng; Zou Jun; Jiang Weimin; Chen Liang; Tang Tiansi

    2010-01-01

    Objective: To explore the feasibility and safety of kyphoplasty via unilateral extrapedicular approach for the treatment of osteoporotic thoracic compression fractures. Methods: A total of 16 patients with painful osteoporotic thoracci fractures were treated by kyphoplasty via unilateral extrapedicular approach. Pain was measured using the self-reporting visual analogue scale (VAS) preoperatively, postoperatively and in the final follow-up. Disability was measured using the Oswestry disability index (ODI) preoperatively, postoperatively and in the final follow-up. The height of the compromised vertebral body, the kyphotic angle were measured preoperatively, postoperatively and in the final follow-up. Results: Operations were completed smoothly, with the exception of 1 patients with less cement leakage but there was no clinical symptom occurred. The other one had intercostal neuralgia. Relief of pain was achieved in 24 hours post-operation. The mean operation time was 31minutes and the mean fluoroscopic time was 19.1. And the mean VAS score of these patients decreased from 8.2 ± 1.1 pre-operatively to 2.6 ± 0.8 post-operatively (P<0.05), and it improved further to 2.8 ± 1.1 in the final follow-up. The ODI score varied from 69.2 ± 1.2 pre-operatively to 32.2 ± 1.1 post-operatively (P<0.05). Improvement was maintained in the final follow-up. Comparing the height of anterior vertebrae (Ha), the height of midline vertebrae (Hm) and the kyphotic angle between pre-and post-operation there was no statistical significant difference. Conclusion: Kyphoplasty via unilateral extrapedicular approach for the treatment of osteoporotic thoracic compression fractures is effective. It can help reducing the radiation exposure. (authors)

  19. Ballooning stability of JET discharges

    International Nuclear Information System (INIS)

    Huysmans, G.T.A.; Goedbloed, J.P.; Galvao, R.M.O.; Lazzaro, E.; Smeulders, P.

    1989-01-01

    Conditions under which ballooning modes are expected to be excited have recently been obtained in two different types of discharges in JET. In the first type, extremely large pressure gradients have been produced in the plasma core through pellet injections in the current rise phase followed by strong additional heating. In the second type, the total pressure of the discharge is approaching the Troyon limit. The stability of these discharges with respect to the ideal MHD ballooning modes has been studied with the stability code HBT. The equilibria are reconstructed with the IDENTC code using the external magnetic measurements and the experimental pressure profile. The results show that the evaluated high beta discharge is unstable in the central region of the plasma. This instability is related to the low shear and not to a large pressure gradient, as expected at the Troyon limit. In the pellet discharges the regions with the large pressure gradients are unstable to ballooning modes at the time of the beta decay, which ends the period of enhanced performance. The maximum pressure gradient in these discharges is limited by the boundary of the first region of stability. The observed phenomena at the beta decay are similar to those observed at the beta limit in DIII-D and TFTR. (author)

  20. Gondola development for CNES stratospheric balloons

    Science.gov (United States)

    Vargas, A.; Audoubert, J.; Cau, M.; Evrard, J.; Verdier, N.

    (over the line of sight) than with dedicated RF system, which requires balloon visibility from the ground station. For long duration flights (3 months) of Infra Red Montgolfieres, a house keeping gondola has been developed, using the Inmarsat C standard to have communication all around the world (up to N or S 80 ° latitude) with an automatic switching between the 4 geostationnary Inmarsat satellites. After validation flights performed from Bauru / Brazil. (2000 & 2001) and Kiruna/Sweden (2002), the first operational flights took place from Bauru in February 2003 during ENVISAT validation campaign. The next flights will be realized in the framework of the Hibiscus campaign planned in February 2004 in Bauru.. The Balloon Division was involved in the Franco / Japanese HSFD II project which consists to drop a mock-up of the Japanese HOPE-X space shuttle from a stratospheric balloon to validate its flight from the altitude of 30 km. We developed a specific gondola as a service module for the HOPE-X shuttle, providing power and GPS radio-frequency signal during the balloon flight phase, telemetry end remote control radio frequency links and separation system with pyrotechnic cutters for the drop of the shuttle. A successful flight was performed at Kiruna in July 2003. Concerning gondola with pointing system, the study of a big g-ray telescope (8 m of focal length), started by the end of 2002. For this 1 ton gondola, the telescope stabilization system will be based on control moment gyro (CMG). The CMG system has been designed and will be manufactured and validated during 2004. The first flight of this g-ray gondola is planned for 2006. The progress, status and future plans concerning these gondola developments will be presented.

  1. An Overview of Current and Future Stratospheric Balloon Mission Capabilities

    Science.gov (United States)

    Smith, Michael

    The modern stratospheric balloon has been used for a variety of missions since the late 1940's. Capabilities of these vehicles to carry larger payloads, fly to higher altitudes, and fly for longer periods of time have increased dramatically over this time. In addition to these basic performance metrics, reliability statistics for balloons have reached unprecedented levels in recent years. Balloon technology developed in the United States in the last decade has the potential to open a new era in economical space science using balloons. As always, the advantage of the balloon platform is the fact that missions can be carried out at a fraction of the cost and schedule of orbital missions. A secondary advantage is the fact that instruments can be re-flown numerous times while upgrading sensor and data processing technologies from year to year. New mission capabilities now have the potential for enabling ground breaking observations using balloons as the primary platform as opposed to a stepping stone to eventual orbital observatories. The limit of very high altitude balloon missions will be explored with respect to the current state of the art of balloon materials and fabrication. The same technological enablers will also be applied to possibilities for long duration missions at mid latitudes with payloads of several tons. The balloon types and their corresponding mission profiles will be presented in a performance matrix that will be useful for potential scientific users in planning future research programs.

  2. Is lead shielding of patients necessary during fluoroscopic procedures? A study based on kyphoplasty

    Energy Technology Data Exchange (ETDEWEB)

    Smith, Joshua R.; Marsh, Rebecca M.; Silosky, Michael S. [University of Colorado School of Medicine, Department of Radiology, Aurora, CO (United States)

    2018-01-15

    To determine the benefits, risks, and limitations associated with wrapping a patient with lead shielding during fluoroscopy-guided kyphoplasty procedures as a way to reduce operator radiation exposure. An anthropomorphic phantom was used to mimic a patient undergoing a kyphoplasty procedure under fluoroscopic guidance. Radiation measurements of the air kerma rate (AKR) were made at several locations and under various experimental conditions. First, AKR was measured at various angles along the horizontal plane of the phantom and at varying distances from the phantom, both with and without a lead apron wrapped around the lower portion of the phantom (referred to here as phantom shielding). Second, the effect of an operator's apron was simulated by suspending a lead apron between the phantom and the measurement device. AKR was measured for the four shielding conditions - phantom shielding only, operator apron only, both phantom shielding and operator apron, and no shielding. Third, AKR measurements were made at various heights and with varying C-arm angle. At all locations, the phantom shielding provided no substantial protection beyond that provided by an operator's own lead apron. Phantom shielding did not reduce AKR at a height comparable to that of an operator's head. Previous reports of using patient shielding to reduce operator exposure fail to consider the role of an operator's own lead apron in radiation protection. For an operator wearing appropriate personal lead apparel, patient shielding provides no substantial reduction in operator dose. (orig.)

  3. Launching Garbage-Bag Balloons.

    Science.gov (United States)

    Kim, Hy

    1997-01-01

    Presents a modification of a procedure for making and launching hot air balloons made out of garbage bags. Student instructions for balloon construction, launching instructions, and scale diagrams are included. (DDR)

  4. Venus Altitude Cycling Balloon Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The ISTAR Group ( IG) and team mate Thin Red Line Aerospace (TRLA) propose a Venus altitude cycling balloon (Venus ACB), an innovative superpressure balloon...

  5. Therapeutic balloon-assisted enteroscopy

    NARCIS (Netherlands)

    H. Aktas (Huseyin); P.B.F. Mensink (Peter)

    2009-01-01

    textabstractSince the introduction of the first balloon-based enteroscopic technique in 2001, therapeutic balloon-assisted enteroscopy (BAE) using either the single or double balloon enteroscopy technique (respectively SBE and DBE) has evolved rapidly. Argon plasma coagulation (APC), polypectomy,

  6. Simulation of stratospheric balloon environment

    International Nuclear Information System (INIS)

    Sable, C.

    1974-01-01

    The behavior of materials used for the construction of stratospheric balloons is studied at DERTS by means of irradiations performed in reals time and simulating the exact flight environment. Two chambers were designed in the laboratory and are described together with the experimental procedure. In order to reduce cost and save time, it is worth accelerating the simulation when only a preliminary evaluation of the sample's properties is required. For this reason, a systematic study was undertaken in order to evaluate the respective effects of different parameters on the material degradation. The results of this study are given [fr

  7. High-definition transcranial direct current stimulation (HD-tDCS) of left dorsolateral prefrontal cortex affects performance in Balloon Analogue Risk Task (BART).

    Science.gov (United States)

    Guo, Heng; Zhang, Zhuoran; Da, Shu; Sheng, Xiaotian; Zhang, Xichao

    2018-02-01

    Studies on risk preferences have long been of great concern and have examined the neural basis underlying risk-based decision making. However, studies using conventional transcranial direct current stimulation (tDCS) revealed that bilateral stimulation could change risk propensity with limited evidence of precisely focalized unilateral high-definition transcranial direct current stimulation (HD-tDCS). The aim of this experiment was to investigate the effect of HD-tDCS focalizing the left dorsal lateral prefrontal cortex (DLPFC) on risk-taking behavior during the Balloon Analogue Risk Task (BART). This study was designed as a between-subject, single-blind, sham-controlled experiment. University students were randomly assigned to three groups: the anodal group (F3 anode, AF3, F1, F5, FC3 returned), the cathodal group (F3 cathodal, AF3, F1, F5, FC3 returned) and the sham group. Subsequently, 1.5-mA 20-min HD-tDCS was applied during the BART, and the Positive Affect and Negative Affect Scale (PANAS), the Sensation Seeking Scale-5 (SSS-5), and the Behavioral Inhibition System and Behavioral Approach System scale (BIS/BAS) were measured as control variables. The cathodal group earned less total money than the sham group, and no significant difference was observed between the anodal group and the sham group. These results showed that, to some extent, focalized unilateral cathodal HD-tDCS on left DLPFC could change performance during risky tasks and diminish risky decision making. Further studies are needed to investigate the dose effect and electrode distribution of HD-tDCS during risky tasks and examine synchronous brain activity to show the neural basis.

  8. Comparison of percutaneous vertebroplasty and percutaneous kyphoplasty for the management of Kümmell's disease: A retrospective study

    Directory of Open Access Journals (Sweden)

    Guang-Quan Zhang

    2015-01-01

    Full Text Available Background: Post traumatic osteonecrosis of a vertebral body occurring in a delayed fashion was first described by the German doctor Kümmell in 1895. Several studies have reported percutaneous vertebroplasty (PVP, or percutaneous kyphoplasty (PKP for Kümmell's disease achieves good outcomes. However, it is unknown whether a technique is superior for the treatment of this disease. The objective of the study is to compare the efficacy of PVP and PKP for the treatment of Kümmell's disease. Materials and Methods: A retrospective review was conducted for 73 patients with Kümmell's disease. PVP was performed in 38 patients and PKP in 35 patients. Visual analogue score (VAS was used to evaluate pain. The anterior vertebral height was measured. The operative time, the incidence of cement leakage and the costs were recorded. Results: In both PVP group and PKP group, the VAS and anterior vertebral height significantly improved at 1-day postoperatively (P 0.05. Between the PVP and PKP groups, there were no significant differences in VAS and the anterior vertebral height at 1-day postoperatively and at the final followup (P > 0.05. The operating time and expense in the PKP group were higher than the PVP group (P < 0.001. Cement leakages in the PKP group were fewer than PVP group (P < 0.05. Conclusions: PVP is a faster, less expensive option that still provides a comparable pain relief and restoration of vertebral height to PKP for the treatment of Kümmell's disease. PKP has a significant advantage over PVP in term of the fewer cement leakages.

  9. Adjustable continence balloons

    DEFF Research Database (Denmark)

    Kjær, Line; Fode, Mikkel; Nørgaard, Nis

    2012-01-01

    . Fourteen patients (12%) ended up with an artificial sphincter or a urethral sling. Sixty patients (63%) experienced no discomfort and 58 (61%) reported being dry or markedly improved. Overall, 50 patients (53%) reported being very or predominantly satisfied. Conclusions. Adjustable continence balloons seem...

  10. Via póstero-lateral unilateral para cifoplastia percutánea con balón Acesso póstero-lateral unilateral para cifoplastia percutânea com balão Posterolateral unilateral approach for percutaneous baloon kyphoplasty

    Directory of Open Access Journals (Sweden)

    Daniel Oscar Ricciardi

    2013-01-01

    Full Text Available Esta experiencia ha sido realizada en el Hospital Alvarez de Buenos Aires, Argentina en pacientes tratados por el Equipo de Columna Vertebral. El autor ha modificado el método original de punción descrito por Valls y Ottolenghi, lo que permite ubicar al paciente en decúbito lateral y prescinde del instrumental descrito originalmente, como spider y guía que se utilizaban con equipos de rayos X convencionales. El presente trabajo pretende describir en detalle la técnica aplicada para efectuar la cifoplastía con balón en vértebras torácicas y lumbares por vía póstero-lateral extrapedicular unilateral bajo anestesia local infiltrativa.Esta experiência foi realizada no Hospital Alvarez de Buenos Aires, Argentina, em pacientes tratados pela Equipe de Coluna Vertebral, que tenho a honra de liderar. O autor modificou o método original de punção descrito por Valls e Ottolenghi, o que permite colocar o paciente em decúbito lateral prescindindo da instrumentação originalmente descrita, tal como spider e fio-guia que eram utilizados com equipamento de raios-X convencional. Este trabalho tem como objetivo descrever em detalhes a técnica utilizada para realizar cifoplastia com balão em vértebras torácicas e lombares por acesso póstero-lateral extrapedicular unilateral com anestesia local por infiltração.This experiment was performed at the Hospital Alvarez from Buenos Aires, Argentina, in patients treated by the Spine Team, which I have the honor to lead. The author modified the original puncture method described by Valls and Ottolenghi, which allows accommodating the patient in the lateral position dispensing the instrumentation originally described like spider and guide wires that were used with X-ray conventional. This paper aims to describe in detail the technique used to perform balloon kyphoplasty for thoracic and lumbar vertebrae by posterolateral extrapedicular unilateral approach with local anesthesia by infiltration.

  11. How to Prevent Leaving 'Needle Cast' or 'Cement Tail' in Vertebroplasty and Kyphoplasty

    International Nuclear Information System (INIS)

    Yang, Hui Lin; Sun, Zhi Yong; Zhang, Hong Tao; Zhu, Xiao Yu; Chen, Kang Wu; Qian, Zhong Lai

    2012-01-01

    Nowadays, percutaneous vertebroplasty, or its evolution kyphoplasty, is a valid therapeutic option for the management of severe back pain, caused by vertebral compression fractures (1). They are minimally invasive, radiologically guided interventional procedures, which involve the injection of polymethylmethacrylate (PMMA) into the fractured vertebral body. The injection process was monitored continuously, under a fluoroscopic control in the lateral plane (2). Ideally, the injection should be completed in 5 to 6 minutes and before the PMMA becomes too viscous to allow reinsertion of the stylus. This is not always possible, but is preferred to avoid the risk of leaving a 'needle castor a 'cement tail', within the soft tissues, as the needle is removed with the adherent cement (Fig. 1). In the event that the reinsertion cannot be achieved, great care should be taken to dislodge the adherent PMMA cement before extracting the needle from the vertebral body (3).

  12. Kyphoplastie als palliative Therapieoption bei pathologischen Frakturen der Brust- und Lendenwirbelsäule

    Directory of Open Access Journals (Sweden)

    Hartwig E

    2004-01-01

    Full Text Available Bedingt durch Fortschritte in der Behandlung von Tumoren hat sich die Lebenserwartung von Krebspatienten deutlich verbessert. Jedoch steigt hiermit auch die Inzidenz von Knochenmetastasen. Mit wenigen Ausnahmen, die primären Knochentumoren betreffend, ist die Art der Behandlung dieser Läsionen in der Regel palliativ. Durch operatives Intervenieren muß bei diesen Patienten ein maximaler palliativer Effekt bei minimaler Morbidität und Mortalität erzielt werden. Die vorwiegenden Ziele sind Schmerzreduktion unter Erhalt der Stabilität und Funktion. Durch die Kyphoplastie wurden Zementierungsverfahren an der Wirbelsäule auch für pathologische Frakturen auf dem Boden metastatischer Manifestationen elegibel. In einer telefonischen Evaluation von 10 Patienten konnte die Wertigkeit des Verfahrens in der palliativen Situation bei Patienten mit Wirbelsäulenmetastasen gezeigt werden.

  13. Scientific ballooning in the 20 th century; a historical perspective

    Science.gov (United States)

    Nishimura, J.

    Hess discovered the cosmic rays in 1912. Using a manned balloon, he found the altitude variation of the radiation. After this discovery, many balloon experiments were performed to explore the most mysterious radiation coming from outside of the earth during the 1920's to the 1930's. At the end of the 1940's, balloon systems were revolutionized by the use of new plastic films and telemetry systems. At almost the same time, highly sensitive nuclear emulsions were developed. Balloon exposures of emulsions brought us new discoveries of the heavy primaries in cosmic rays. Extensive studies with nuclear emulsions discovered high-energy phenomena and new particles between the end of 1940's to the 1960's. At the same time, in various countries, experiments with more sophisticated electronic devices were begun together with ingenious work on balloon technology. Inventions were made in the areas of designing, manufacturing, materials, telemetry systems for balloons and long duration flight systems etc. Several permanent launching stations were established in various countries in the 1960's Here, I review the development of essential technologies in scientific ballooning, and their value in contributing to the growth of space physics. As the future prospect, I stress the point that scientific ballooning is indispensable and a most cost-effective way to explore space astrophysics and Earth science, in addition to the preparation of satellite and the space station experiments.

  14. A Systematic Review of the Level of Evidence in Economic Evaluations of Medical Devices: The Example of Vertebroplasty and Kyphoplasty.

    Directory of Open Access Journals (Sweden)

    Nicolas Martelli

    Full Text Available Economic evaluations are far less frequently reported for medical devices than for drugs. In addition, little is known about the quality of existing economic evaluations, particularly for innovative devices, such as those used in vertebroplasty and kyphoplasty.To assess the level of evidence provided by the available economic evaluations for vertebroplasty and kyphoplasty.A systematic review of articles in English or French listed in the MEDLINE, PASCAL, COCHRANE and National Health Service Economic Evaluation databases, with limits on publication date (up to the date of the review, March 2014.We included only economic evaluations of vertebroplasty or kyphoplasty. Editorial and methodological articles were excluded.Data were extracted from articles by two authors working independently and using two analysis grids to measure the quality of economic evaluations.Twenty-one studies met our inclusion criteria. All were published between 2008 and 2014. Eighteen (86% were full economic evaluations. Cost-effectiveness analysis (CEA was the most frequent type of economic evaluation, and was present in 11 (52% studies. Only three CEAs complied fully with the British Medical Journal checklist. The quality of the data sources used in the 21 studies was high, but the CEAs conforming to methodological guidelines did not use high-quality data sources for all components of the analysis.This systematic review shows that the level of evidence in economic evaluations of vertebroplasty and kyphoplasty is low, despite the recent publication of a large number of studies. This finding highlights the challenges to be faced to improve the quality of economic evaluations of medical devices.

  15. A Survey of Titan Balloon Concepts and Technology Status

    Science.gov (United States)

    Hall, Jeffery L.

    2011-01-01

    This paper surveys the options for, and technology status of, balloon vehicles to explore Saturn's moon Titan. A significant amount of Titan balloon concept thinking and technology development has been performed in recent years, particularly following the spectacular results from the descent and landing of the Huygens probe and remote sensing observations by the Cassini spacecraft. There is widespread recognition that a balloon vehicle on the next Titan mission could provide an outstanding and unmatched capability for in situ exploration on a global scale. The rich variety of revealed science targets has combined with a highly favorable Titan flight environment to yield a wide diversity of proposed balloon concepts. The paper presents a conceptual framework for thinking about balloon vehicle design choices and uses it to analyze various Titan options. The result is a list of recommended Titan balloon vehicle concepts that could perform a variety of science missions, along with their projected performance metrics. Recent technology developments for these balloon concepts are discussed to provide context for an assessment of outstanding risk areas and technological maturity. The paper concludes with suggestions for technology investments needed to achieve flight readiness.

  16. Extrapedicular Infiltration Anesthesia as an Improved Method of Local Anesthesia for Unipedicular Percutaneous Vertebroplasty or Percutaneous Kyphoplasty

    Directory of Open Access Journals (Sweden)

    Liehua Liu

    2016-01-01

    Full Text Available Aim. This report introduces extrapedicular infiltration anesthesia as an improved method of local anesthesia for unipedicular percutaneous vertebroplasty or percutaneous kyphoplasty. Method. From March 2015 to March 2016, 44 patients (11 males and 33 females with osteoporotic vertebral compression fractures with a mean age of 71.4±8.8 years (range: 60 to 89 received percutaneous vertebroplasty or percutaneous kyphoplasty. 24 patients were managed with conventional local infiltration anesthesia (CLIA and 20 patients with both CLIA and extrapedicular infiltration anesthesia (EPIA. Patients evaluated intraoperative pain by means of the visual analogue score and were monitored during the procedure for additional sedative analgesia needs and for adverse nerve root effects. Results. VAS of CLIA + EPIA and CLIA group was 2.5±0.7 and 4.3±1.0, respectively, and there was significant difference (P=0.001. In CLIA group, 1 patient required additional sedative analgesia, but in CLIA + EPIA group, no patients required that. In the two groups, no adverse nerve root effects were noted. Summary. Extrapedicular infiltration anesthesia provided good local anesthetic effects without significant complications. This method deserves further consideration for use in unipedicular percutaneous vertebroplasty and percutaneous kyphoplasty.

  17. Retrograde prostatic urethroplasty with balloon catheter

    International Nuclear Information System (INIS)

    Castaneda, F.; Reddy, P.; Hulbert, J.; Letourneau, J.G.; Hunter, D.W.; Castaneda-Zuniga, W.R.; Amplatz, K.

    1987-01-01

    The authors performed retrograde prostatic urethroplasty in 18 patients using a 25-mm urethroplasty balloon catheter. The procedure was performed on an outpatient basis under local anesthesia. Voiding cystourethrography, retrograde urethrography, rectal US, and MRE imaging were performed before and immediately after the procedure and at 2 weeks and 3, 6, 12, and 18 months. Long-term results at 18 months and possible clinical implications are discussed

  18. Development of Venus Balloon Seismology Missions Through Earth Analog Experiments

    Science.gov (United States)

    Krishnamoorthy, S.; Komjathy, A.; Cutts, J. A.; Pauken, M. T.; Garcia, R. F.; Mimoun, D.; Jackson, J. M.; Kedar, S.; Smrekar, S. E.; Hall, J. L.

    2017-11-01

    The study of a planet’s seismic activity is central to the understanding of its internal structure. We discuss advances made through Earth analog testing for performing remote seismology on Venus using balloons floated in the mid-atmosphere.

  19. Balloon valvuloplasty for severe mitral valve stenosis in pregnancy

    African Journals Online (AJOL)

    . Commerford, B. Levetan. Balloon Valvuloplasties for severe mitral stenosis were performed on 11 ... 140 patients each year with cardiac disease - an incidence of 0.5%. ... Department of Medicine, Groote Schuur Hospital and University of.

  20. Cleft formation in pumpkin balloons

    Science.gov (United States)

    Baginski, Frank E.; Brakke, Kenneth A.; Schur, Willi W.

    NASA’s development of a large payload, high altitude, long duration balloon, the Ultra Long Duration Balloon, centers on a pumpkin shape super-pressure design. Under certain circumstances, it has been observed that a pumpkin balloon may be unable to pressurize into the desired cyclically symmetric equilibrium configuration, settling into a distorted, undesired state instead. Success of the pumpkin balloon for NASA requires a thorough understanding of the phenomenon of multiple stable equilibria and developing of means for the quantitative assessment of design measures that prevent the occurrence of undesired equilibrium. In this paper, we will use the concept of stability to classify cyclically symmetric equilibrium states at full inflation and pressurization. Our mathematical model for a strained equilibrium balloon, when applied to a shape that mimics the Phase IV-A balloon of Flight 517, predicts instability at float. Launched in Spring 2003, this pumpkin balloon failed to deploy properly. Observations on pumpkin shape type super-pressure balloons that date back to the 1980s suggest that within a narrowly defined design class of pumpkin shape super-pressure balloons where individual designs are fully described by the number of gores ng and by a single measure of the bulging gore shape, the designs tend to become more vulnerable with the growing number of gores and with the diminishing size of the bulge radius rB Weight efficiency considerations favor a small bulge radius, while robust deployment into the desired cyclically symmetrical configuration becomes more likely with an increased bulge radius. In an effort to quantify this dependency, we will explore the stability of a family of balloon shapes parametrized by (ng, rB) which includes a design that is very similar, but not identical, to the balloon of Flight 517. In addition, we carry out a number of simulations that demonstrate other aspects related to multiple equilibria of pumpkin balloons.

  1. Treatment of tuberculous bronchostenosis: balloon bronchoplasty

    International Nuclear Information System (INIS)

    Ahn, Joong Mo; Im, Jung Gi; Han, Joon Koo; Park, Jae Hyung

    1993-01-01

    The purpose of this study is to evaluate the efficacy of the balloon bronchoplasty in the treatment of the tuberculous bronchostenosis. Balloon bronchoplasty was performed in thirteen patients with stenosis of the left main bronchus (two with combined left upper and lower lobar bronchostenosis) using a inflatable balloon catheter under a fluoroscopic guide. We analysed the changes in the severity of dyspnea and wheezing, serial FEV1/FVC as a parameter of the airflow obstruction, and bronchial diameter and lung volume on chest radiographs. The extent of pulmonary tuberculosis was correlated with the improvement of FEV1/ FVC. There was an improvement of dyspnea in 69% (9/13), decrease of wheezing in 69% (9/13), significant increase of FEV1/FVC in 18% (2/11). The increase of the bronchial diameter and lung volume were seen in 84% (11/13) and 53% (7/13), respectively. The significant increase of FEV1/FVC was seen in 28% (2/7) of the patients with lung involvement of tuberculous less than one third of left upper lobe, whereas there was no increase in those of more than one third. The was no complication except transient leukocytosis, fever and blood-tinged sputum. In conclusion, balloon bronchoplasty is effective in the treatment of medically intractable tuberculous bronchostenosis, and can be considered as an initial method of treatment

  2. An investigation of electrostatically deposited radionuclides on latex balloons

    International Nuclear Information System (INIS)

    Price, T.; Caly, A.

    2012-01-01

    Use of Canadian Nuclear Society (CNS) education material for a community science education event to promote science awareness, science culture and literacy (Science Rendezvous 2011) lead to investigation of observed phenomena. Experiments are done on balloons that are electrostatically charged then left to collect particulate. Alpha spectroscopy was performed to identify alpha emitting radioisotopes present on the balloons. The time dependent behaviour of the activity was investigated. Additionally, the Alpha activity of the balloon was compared to Beta activity. The grounds for further investigations are proposed. (author)

  3. Aerodynamics of a Party Balloon

    Science.gov (United States)

    Cross, Rod

    2007-01-01

    It is well-known that a party balloon can be made to fly erratically across a room, but it can also be used for quantitative measurements of other aspects of aerodynamics. Since a balloon is light and has a large surface area, even relatively weak aerodynamic forces can be readily demonstrated or measured in the classroom. Accurate measurements…

  4. Mechanical induction of bi-directional orientation of primary porcine bladder smooth muscle cells in tubular fibrin-poly(vinylidene fluoride) scaffolds for ureteral and urethral repair using cyclic and focal balloon catheter stimulation.

    Science.gov (United States)

    Seifarth, Volker; Grosse, Joachim O; Gossmann, Matthias; Janke, Heinz Peter; Arndt, Patrick; Koch, Sabine; Epple, Matthias; Artmann, Gerhard M; Artmann, Aysegül Temiz

    2017-09-01

    To restore damaged organ function or to investigate organ mechanisms, it is necessary to prepare replicates that follow the biological role model as faithfully as possible. The interdisciplinary field of tissue engineering has great potential in regenerative medicine and might overcome negative side effects in the replacement of damaged organs. In particular, tubular organ structures of the genitourinary tract, such as the ureter and urethra, are challenging because of their complexity and special milieu that gives rise to incrustation, inflammation and stricture formation. Tubular biohybrids were prepared from primary porcine smooth muscle cells embedded in a fibrin gel with a stabilising poly(vinylidene fluoride) mesh. A mechanotransduction was performed automatically with a balloon kyphoplasty catheter. Diffusion of urea and creatinine, as well as the bursting pressure, were measured. Light and electron microscopy were used to visualise cellular distribution and orientation. Histological evaluation revealed a uniform cellular distribution in the fibrin gel. Mechanical stimulation with a stretch of 20% leads to a circumferential orientation of smooth muscle cells inside the matrix and a longitudinal alignment on the outer surface of the tubular structure. Urea and creatinine permeability and bursting pressure showed a non-statistically significant trend towards stimulated tissue constructs. In this proof of concept study, an innovative technique of intraluminal pressure for mechanical stimulation of tubular biohybrids prepared from autologous cells and a composite material induce bi-directional orientation of smooth muscle cells by locally and cyclically applied mechanical tension. Such geometrically driven patterns of cell growth within a scaffold may represent a key stage in the future tissue engineering of implantable ureter replacements that will allow the active transportation of urine from the renal pelvis into the bladder.

  5. Percutaneous treatment of extrahepatic bile duct stones assisted by balloon sphincteroplasty and occlusion balloon

    Energy Technology Data Exchange (ETDEWEB)

    Park, Yong Sung; Kim, Ji Hyung; Choi, Young Woo; Lee, Tae Hee; Hwang, Cheol Mog; Cho, Young Jun; Kim, Keum Won [Konyang University Hospital, Daejeon (Korea, Republic of)

    2005-12-15

    To describe the technical feasibility and usefulness of extrahepatic biliary stone removal by balloon sphincteroplasty and occlusion balloon pushing. Fifteen patients with extrahepatic bile duct stones were included in this study. Endoscopic stone removal was not successful in 13 patients, and two patients refused the procedure due to endoscopy phobia. At first, all patients underwent percutaneous transhepatic biliary drainage (PTBD). A few days later, through the PTBD route, balloon assisted dilatation for common bile duct (CBD) sphincter was performed, and then the stones were pushed into the duodenum using an 11.5 mm occlusion balloon. Success rate, reason for failure, and complications associated with the procedure were evaluated. Eight patients had one stone, five patients had two stones, and two patients had more than five stones. The procedure was successful in 13 patients (13/15). In 12 of the patients, all stones were removed in the first trial. In one patients, residual stones were discovered on follow-up cholangiography, and were subsequently removed in the second trial. Technical failure occurred in two patients. Both of these patients had severely dilated CBD and multiple stones with various sizes. Ten patients complained of pain in the right upper quadrant and epigastrium of the abdomen immediately following the procedure, but there were no significant procedure-related complications such as bleeding or pancreatitis. Percutaneous extrahepatic biliary stone removal by balloon sphincteroplasty and subsequent stone pushing with occlusion balloon is an effective, safe, and technically feasible procedure which can be used as an alternative method in patients when endoscopic extrahepatic biliary stone removal was not successful.

  6. Percutaneous treatment of extrahepatic bile duct stones assisted by balloon sphincteroplasty and occlusion balloon

    International Nuclear Information System (INIS)

    Park, Yong Sung; Kim, Ji Hyung; Choi, Young Woo; Lee, Tae Hee; Hwang, Cheol Mog; Cho, Young Jun; Kim, Keum Won

    2005-01-01

    To describe the technical feasibility and usefulness of extrahepatic biliary stone removal by balloon sphincteroplasty and occlusion balloon pushing. Fifteen patients with extrahepatic bile duct stones were included in this study. Endoscopic stone removal was not successful in 13 patients, and two patients refused the procedure due to endoscopy phobia. At first, all patients underwent percutaneous transhepatic biliary drainage (PTBD). A few days later, through the PTBD route, balloon assisted dilatation for common bile duct (CBD) sphincter was performed, and then the stones were pushed into the duodenum using an 11.5 mm occlusion balloon. Success rate, reason for failure, and complications associated with the procedure were evaluated. Eight patients had one stone, five patients had two stones, and two patients had more than five stones. The procedure was successful in 13 patients (13/15). In 12 of the patients, all stones were removed in the first trial. In one patients, residual stones were discovered on follow-up cholangiography, and were subsequently removed in the second trial. Technical failure occurred in two patients. Both of these patients had severely dilated CBD and multiple stones with various sizes. Ten patients complained of pain in the right upper quadrant and epigastrium of the abdomen immediately following the procedure, but there were no significant procedure-related complications such as bleeding or pancreatitis. Percutaneous extrahepatic biliary stone removal by balloon sphincteroplasty and subsequent stone pushing with occlusion balloon is an effective, safe, and technically feasible procedure which can be used as an alternative method in patients when endoscopic extrahepatic biliary stone removal was not successful

  7. Spinal tuberculosis of the lumbar spine after percutaneous vertebral augmentation (vertebroplasty or kyphoplasty).

    Science.gov (United States)

    Zou, Ming-Xiang; Wang, Xiao-Bin; Li, Jing; Lv, Guo-Hua; Deng, You-Wen

    2015-06-01

    Spinal tuberculosis occurring after percutaneous vertebral augmentation has rarely been described. To date, only two such cases have been documented in the literature. Vertebral augmentation may reactivate a quiescent tuberculous lesion and promote the infective process in elderly patients with or without immunosuppression, thereby resulting in poor outcomes. The purposes of this study were to present two cases in which spinal tuberculosis occurred after vertebroplasty or kyphoplasty, to highlight the clinical features and need for early diagnosis of this pathology, and to postulate probable reasons for this association. This study is based on a clinical case series and literature review. In this report, we review the clinical histories of two old women undergoing vertebral augmentation with subsequent spinal tuberculosis. The first patient responded favorably to conservative treatment with multidrug antitubercular therapy and spinal braces. The second patient underwent surgical debridement through a posterior approach alone, without instrumentation, combined with adjuvant chemotherapy. By 1 year after treatment, both patients had experienced almost complete recovery and continued to be seen for follow-up visits. Suspicion should be high, and magnetic resonance imaging is warranted in cases with deteriorating clinical symptoms and signs of acute infection after vertebral augmentation. We propose obtaining exhaustive microbiologic and histologic evidence via needle biopsy or open surgery in a timely fashion to establish an accurate diagnosis because tubercular spondylitis occurring in such a situation may progress rapidly. Copyright © 2015 Elsevier Inc. All rights reserved.

  8. Air Force Cambridge Research Laboratories balloon operations

    Science.gov (United States)

    Danaher, T. J.

    1974-01-01

    The establishment and functions of the AFCRL balloon operations facility are discussed. The types of research work conducted by the facility are defined. The facilities which support the balloon programs are described. The free balloon and tethered balloon capabilities are analyzed.

  9. 21 CFR 874.4100 - Epistaxis balloon.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Epistaxis balloon. 874.4100 Section 874.4100 Food... DEVICES EAR, NOSE, AND THROAT DEVICES Surgical Devices § 874.4100 Epistaxis balloon. (a) Identification. An epistaxis balloon is a device consisting of an inflatable balloon intended to control internal...

  10. Endoscopic Papillary Balloon Dilation with Large Balloon after Limited Sphincterotomy for Retrieval of Choledocholithiasis

    Science.gov (United States)

    Bang, Seungmin; Kim, Myoung Hwan; Park, Jeong Youp; Park, Seung Woo; Song, Si Young

    2006-01-01

    Endoscopic papillary balloon dilation (EBD) for choledocholithiasis is known to be comparable to endoscopic sphincterotomy (EST) especially in cases of small stones. With larger stones, EBD with conventional balloon, which have a diameter of 6-8 mm, was reported as less effective for extraction of stones. We evaluated the efficacy and complications of EBD with large balloons (10-15 mm) after limited EST for retrieval of choledocholithiasis. From February 2005, we have performed EBD with limited EST for retrieval of common bile duct (CBD) stones. The patients who admitted with hyperamylasemia and gallstone pancreatitis were excluded. In cases without CBD dilation, EPBD with 12 mm for 40 seconds was performed. And in cases with CBD dilation, we dilated the sphincters with 15 mm sized balloon for 40 seconds. Total 22 patients (11 of male) were performed EBD with limited EST for retrieval of CBD stones. The median diameter of the stones was 10 mm (5-25 mm). Ten cases had multiple stones and 6 cases periampullary diverticuli. Successful stone removal in the initial session of ERCP with EBD was accomplished in 16 patients (72.7%). And complete retrieval of bile duct stones was achieved in all patients with repeated ERCP. In the aspect of complications, any episodes of perforation, bleeding was not developed. Only one case of mild grade of post-procedural pancreatitis was noted. However, post-procedural hyperamylasemia was developed in 16 cases (68.2%). EBD with larger balloon seems to be a feasible and safe alternative technique for conventional EST in CBD stone extraction. PMID:17191309

  11. US Air Force Balloon Observations

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Worksheets containing pilot balloon data computed from releases at Air Force stations in the western United States. Elevation and azimuth angles are used to compute...

  12. US Daily Pilot Balloon Observations

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Pilot Balloon observational forms for the United States. Taken by Weather Bureau and U.S. Army observers. Period of record 1918-1960. Records scanned from the NCDC...

  13. Retrieving Balloon Data in Flight

    Data.gov (United States)

    National Aeronautics and Space Administration — NASA's Ultra Long Duration Balloon (ULDB) program will soon make flights lasting up to 100 days. Some flights may generate high data rates and retrieving this data...

  14. US Monthly Pilot Balloon Observations

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Monthly winds aloft summary forms summarizing Pilot Balloon observational data for the United States. Generally labeled as Form 1114, and then transitioning to Form...

  15. Superpressure Tow Balloon for Extending Durations and Modifying Trajectories of High Altitude Balloon Systems Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The proposed innovation involves the concept of using a Superpressure Tow Balloon (STB) with existing NASA high altitude balloon designs to form a tandem balloon...

  16. Stability of Balloon-Retention Gastrostomy Tubes with Different Concentrations of Contrast Material: In Vitro Study

    International Nuclear Information System (INIS)

    Lopera, Jorge E.; Alvarez, Alex; Trimmer, Clayton; Josephs, Shellie; Anderson, Matthew; Dolmatch, Bart

    2009-01-01

    The purpose of this study was to determine the performance of two balloon-retention-type gastrostomy tubes when the balloons are inflated with two types of contrast materials at different concentrations. Two commonly used balloon-retention-type tubes (MIC and Tri-Funnel) were inflated to the manufacturer's recommended volumes (4 and 20 cm 3 , respectively) with normal saline or normal saline plus different concentrations of contrast material. Five tubes of each brand were inflated with normal saline and 0%, 25%, 50%, 75%, and 100% contrast material dilutions, using either nonionic hyperosmolar contrast, or nonionic iso-osmolar contrast. The tubes were submerged in a glass basin containing a solution with a pH of 4. Every week the tubes were visually inspected to determine the integrity of the balloons, and the diameter of the balloons was measured with a caliper. The tests were repeated every week for a total of 12 weeks. The MIC balloons deflated slightly faster over time than the Tri-Funnel balloons. The Tri-Funnel balloons remained relatively stable over the study period for the different concentrations of contrast materials. The deflation rates of the MIC balloons were proportionally related to the concentration of saline and inversely related to the concentration of the contrast material. At high contrast material concentrations, solidification of the balloons was observed. In conclusion, this in vitro study confirms that the use of diluted amounts of nonionic contrast materials is safe for inflating the balloons of two types of balloon-retention feeding tubes. High concentrations of contrast could result in solidification of the balloons and should be avoided.

  17. Overview of the Scientific Balloon Activity in Sweden

    Science.gov (United States)

    Abrahamsson, Mattias; Kemi, Stig; Lockowandt, Christian; Andersson, Kent

    SSC, formerly known as Swedish Space Corporation, is a Swedish state-owned company working in several different space related fields, including scientific stratospheric balloon launches. Esrange Space Centre (Esrange in short) located in the north of Sweden is the launch facility of SSC, where both sounding rocket launches and stratospheric balloon launches are conducted. At Esrange there are also facilities for satellite communication, including one of the largest civilian satellite data reception stations in the world. Stratospheric balloons have been launched from Esrange since 1974, when the first flights were performed together with the French space agency CNES. These balloon flights have normally flown eastward either only over Sweden or into Finland. Some flights have also had permission to fly into Russia, as far as the Ural Mountains. Normal flight times are from 4 to 12 hours. These eastward flights are conducted during the winter months (September to May). Long duration flights have been flown from ESC since 2005, when NASA flew the BLAST payload from Sweden to north Canada. The prevailing westerly wind pattern is very advantageous for trans-Atlantic flights during summer (late May to late July). The long flight times are very beneficial for astronomical payloads, such as telescopes that need long observation times. In 2013 two such payloads were flown, the first called SUNRISE was a German/US solar telescope, and the other called PoGOLite with a Swedish gamma-ray telescope. In 14 days PoGOLite, which had permission to fly over Russia, made an almost complete circumpolar flight. Typical scientific balloon payload fields include atmospheric research, including research on ozone depletion, astronomical and cosmological research, and research in technical fields such as aerodynamics. University students from all over Europe are involved in flights from Esrange under a Swedish/German programme called BEXUS. Two stratospheric balloons are flown with student

  18. Pioneering Space Research with Balloons

    Science.gov (United States)

    Jones, W. V.

    NASA s Scientific Ballooning Planning Team has concluded that ballooning enables significant scientific discoveries while providing test beds for space instruments and training for young scientists Circumpolar flights around Antarctica have been spectacularly successful with fight durations up to 42 days Demand for participation in this Long-Duration Balloon LDB program a partnership with the U S National Science Foundation Office of Polar Programs is greater than the current capacity of two flights per campaign Given appropriate international agreements LDB flights in the Northern Hemisphere would be competitive with Antarctic flights and super-pressure balloons would allow comparable flights at any latitude The Balloon Planning Team made several recommendations for LDB flights provide a reliable funding source for sophisticated payloads extend the Antarctic capability to three flights per year and develop a comparable capability in the Arctic provide aircraft for intact-payload recovery develop a modest trajectory modification capability to enable longer flights and enhance super-pressure balloons to carry 1-ton payloads to 38 km Implementation of these recommendations would facilitate frequent access to near-space for cutting-edge research and technology development for a wide range of investigations

  19. [Analysis of clinical effects of percutaneous vertebroplasty and percutaneous kyphoplasty in treating osteoporotic vertebral compression fracture].

    Science.gov (United States)

    Wu, Yao; Wang, Feng; Zhou, Jian-Qiang; Liu, Cai-Yun; Wu, Rui-Xing

    2014-05-01

    To explore the clinical outcomes of percutaneous vertebroplasty (PVP) and percutaneous kyphoplasty (PKP) in treating osteoporotic vertebral compression fracture (OVCF). From January 2007 to February 2010, the data of 40 patients with osteoporotic vertebral compression fracture underwent treatment were retrospectively analyzed. Of them,20 patients were treated with PVP (PVP group), there were 8 males and 12 females with an average age of (66.37 +/- 2.34) years old (54 to 81); 20 patients were treated with PKP (PKP group), there were 11 males and 9 females with an average of (65.12 +/- 3.21) years old (56 to 79). Postoperative at 1 week, 12 weeks, 1 year, pain and daily life function were respectively assessed by visual analogue scale (VAS) and Barthel index (BI); and anterior height of responsibility vertebra, Cobb angle were measured by X-rays. In PVP group, 1 case complicated with bone cement leakage without clinical symptoms and no operation to treat. No postoperative infection and deep vein thrombosis were found between two groups. All patients were followed up more than 1 year, pain and daily life function has obviously improved than preoperative (P 0.05); there was no significant difference between two groups (P > 0.05). In PVP group, there was no significant difference in anterior height of responsibility vertebra, Cobb angle before and after operation;and in PKP group, postoperative data has obviously improved than preoperative (P 0.05); there was no significant difference between two groups at 1 week, 12 weeks, 1 year after operation. Both the methods can obviously relieve pain and completely or partly recover daily life function in treating OVCF. But PKP has advantages of recovery of anterior height of responsibility vertebra and correction of Cobb angle, especially for serious compression.

  20. Pregnancy-associated osteoporosis with eight fractures in the vertebral column treated with kyphoplasty and bracing: a case report.

    Science.gov (United States)

    Bonacker, J; Janousek, M; Kröber, M

    2014-02-01

    Pregnancy-associated osteoporosis is a rare condition, which imposes multiple symptoms in the musculoskeletal system. Common complaints announced by patients are severe pain in the lower back, hips and the joints of the lower extremities with a reduced and less mobility status in general. Most of the patients' problems occur in the last trimester of pregnancy or postpartum and are often not diagnosed as side effects of osteoporosis but as problems associated with pregnancy. Although vertebral fractures are rare complications of pregnancy-associated osteoporosis, they should be always considered in women presenting with an acute pain syndrome in peripregnancy period. This case presents a 40-year-old primagravid woman who developed pain in hips and severe pain in the lower back causing an immobilization diagnosed with a pregnancy-associated osteoporosis with eight compression fractures in the thoracic and lumbar spine. Because of sagittal imbalance of the spine, she was treated with kyphoplasty at the four lumbar fractures and with bracing for the upper, thoracic ones, additional to the conservative anti-osteoporotic therapy. The authors discuss pregnancy-associated osteoporosis and its clinical presentation, as well as the indications of kyphoplasty, spinal alignment and the risk of single conservative treatment.

  1. Use of Cutting Balloon in the Treatment of Urethral Stricture: A Novel Technique

    International Nuclear Information System (INIS)

    Yildirim, Erkan; Cicek, Tufan; Istanbulluoglu, Okan; Ozturk, Bulent

    2009-01-01

    The peripheral cutting balloon has been used to treat various nonvascular strictures as well as vascular stenosis. In this article, we describe for the first time the use of the cutting balloon in the treatment of patients with urethral stricture. Four patients with bulbar urethral stricture were included in the study. All strictures were successfully dilated with the cutting balloon, and patients were free of symptoms at 6-month follow-up. Cutting-balloon dilatation is a safe, easy-to-perform, and effective treatment for patients with tight urethral strictures.

  2. Hybrid cutting balloon dilatation for treatment of cor triatriatum sinister in a cat.

    Science.gov (United States)

    Stern, Joshua A; Tou, Sandra P; Barker, Piers C A; Hill, Kevin D; Lodge, Andrew J; Mathews, Kyle G; Keene, Bruce W

    2013-09-01

    A hybrid surgical approach and balloon dilatation were performed successfully in a cat with cor triatriatum sinister and clinical signs of congestive heart failure. Left lateral thoracotomy was used to access the heart and cutting balloon followed by standard balloon dilatation were utilized to dilate the perforation in the anomalous left atrial membrane. Clinical signs resolved completely after dilation of the anomalous left atrial membrane. Based upon the outcome of this case, balloon dilatation appears to be a viable treatment option for cats affected with cor triatriatum sinister. Published by Elsevier B.V.

  3. Balloon sheaths for gastrointestinal guidance and access: a preliminary phantom study

    Energy Technology Data Exchange (ETDEWEB)

    He, Xu; Shin, Ji Hoon; Kim, Hyo Cheol; Woo, Cheol Woong; Woo, Sung Ha; Choi, Won Chan; Kim, Jong Gyu; Lim, Jin Oh; Kim, Tae Hyung; Yoon, Chang Jin; Song, Ho Young [Univerisyt of Ulsan College of Medicine, Seoul (Korea, Republic of); Kang, Wee Chang [Daejeon University, Daejeon (Korea, Republic of)

    2005-09-15

    We wanted to evaluate the feasibility and usefulness of a newly designed balloon sheath for gastrointestinal guidance and access by conducting a phantom study. The newly designed balloon sheath consisted of an introducer sheath and a supporting balloon. A coil catheter was advanced over a guide wire into two gastroduodenal phantoms (one was with stricture and one was without stricture); group I was without a balloon sheath, group II was with a deflated balloon sheath, and groups III and IV were with an inflated balloon and with the balloon in the fundus and body, respectively. Each test was performed for 2 minutes and it was repeated 10 times in each group by two researchers, and the positions reached by the catheter tip were recorded. Both researchers had better performances with both phantoms in order of group IV, III, II and I. In group IV, both researchers advanced the catheter tip through the fourth duodenal segment in both the phantoms. In group I, however, the catheter tip never reached the third duodenal segment in both the phantoms by both the researchers. The numeric values for the four study groups were significantly different for both the phantoms ({rho} < 0.001). A significant difference was also found between group III and IV for both phantoms ({rho} < 0.001). The balloon sheath seems to be feasible for clinical use, and it has good clinical potential for gastrointestinal guidance and access, particularly when the inflated balloon is placed in the gastric body.

  4. Balloon sheaths for gastrointestinal guidance and access: a preliminary phantom study

    International Nuclear Information System (INIS)

    He, Xu; Shin, Ji Hoon; Kim, Hyo Cheol; Woo, Cheol Woong; Woo, Sung Ha; Choi, Won Chan; Kim, Jong Gyu; Lim, Jin Oh; Kim, Tae Hyung; Yoon, Chang Jin; Song, Ho Young; Kang, Wee Chang

    2005-01-01

    We wanted to evaluate the feasibility and usefulness of a newly designed balloon sheath for gastrointestinal guidance and access by conducting a phantom study. The newly designed balloon sheath consisted of an introducer sheath and a supporting balloon. A coil catheter was advanced over a guide wire into two gastroduodenal phantoms (one was with stricture and one was without stricture); group I was without a balloon sheath, group II was with a deflated balloon sheath, and groups III and IV were with an inflated balloon and with the balloon in the fundus and body, respectively. Each test was performed for 2 minutes and it was repeated 10 times in each group by two researchers, and the positions reached by the catheter tip were recorded. Both researchers had better performances with both phantoms in order of group IV, III, II and I. In group IV, both researchers advanced the catheter tip through the fourth duodenal segment in both the phantoms. In group I, however, the catheter tip never reached the third duodenal segment in both the phantoms by both the researchers. The numeric values for the four study groups were significantly different for both the phantoms (ρ < 0.001). A significant difference was also found between group III and IV for both phantoms (ρ < 0.001). The balloon sheath seems to be feasible for clinical use, and it has good clinical potential for gastrointestinal guidance and access, particularly when the inflated balloon is placed in the gastric body

  5. Usefulness of cutting balloon angioplasty for the treatment of congenital heart defects.

    Science.gov (United States)

    Kusa, Jacek; Mazurak, Magdalena; Skierska, Agnieszka; Szydlowski, Leslaw; Czesniewicz, Pawel; Manka, Lukasz

    2017-11-13

    Patients with complex congenital heart defects may have different hemodynamic problems which require a variety of interventional procedures including angioplasty which involves using high-pressure balloons. After failure of conventional balloon angioplasty cutting balloon angioplasty is the next treatment option available. The purpose of this study was to evaluate the safety and efficacy of cutting balloon angioplasty in children with different types of congenital heart defects. Cutting balloon angioplasty was performed in 28 children with different congenital heart defects. The indication for cutting balloon angioplasty was: pulmonary artery stenosis in 17 patients, creating or dilatation of interatrial communication in 10 patients, and stenosis of left subclavian artery in 1 patient. In the pulmonary arteries group there was a significant decrease in systolic blood pressure (SBP) in the proximal part of the artery from the average 74.33 ± 20.4 mm Hg to 55 ± 16.7 mm Hg (p cutting balloon angioplasty was performed after an unsuccessful classic Rashkind procedure. After cutting balloon angioplasty there was a significant widening of the interatrial communication. Cutting balloon angioplasty is a feasible and effective treatment option indifferent congenital heart defects.

  6. Retrograde transurethral balloon dilation of the prostate

    International Nuclear Information System (INIS)

    Castaneda, F.; Reddy, P.; Wasserman, N.F.; Lund, G.; Hulbert, J.; Hunter, D.; Castaneda-Zuniga, W.R.; Amplatz, K.

    1986-01-01

    A series of patients with documented benign prostatic hypertrophy evaluated by urodynamic studies, voiding cystourethrography, retrograde urethrography, and MR imaging underwent dilation performed using a retrograde transurethral approach with 25-mm balloon dilators inflated at a pressure of 3-4 atm for 10 minutes. Immediately after the procedure, retrograde and voiding cystourethrography as well as MR imaging were performed. A Foley catheter was left in place for 24 hours. Complete relief of symptoms has occurred in all of the patients during the follow-up period. No significant complications other than transient hematuria resulted from the procedure. Results of the comparison studies and of MR imaging are discussed

  7. [The relationship between angle of puncture and distribution of bone cement of unilateral percutaneous kyphoplasty for the treatment of thoracolumbar compression fractures].

    Science.gov (United States)

    Wang, Xiang-fu; Fan, You-fu; Shi, Rui-fang; Deng, Qiang; Li, Zhong-feng

    2015-08-01

    To explore the relationship of bone cement distribution and the puncture angle in the treatment of thoracolumbar compression fractures with unilateral percutaneous kyphoplasty (PKP). The clinical data of 37 patients with thoracolumbar osteoporotic compression fractures underwent PKP between January 2013 to March 2014 were retrospectively analyzed, all punctures were performed unilaterally. There were 6 males, aged from 65 to 78 years old with an average of (71.83 ± 6.15) years; and 31 females, aged from 57 to 89 years old with an average of (71.06 ± 7.89) years. Imaging data were analyzed and puncture angle and puncture point were measured before operation. According to the measured data, the puncture were performeds during the operation. Distribution area of bone cement were calculated by X-rays data after operation. The effect of bone cement distribution on suitable puncture angle was analyzed; VAS score was used to evaluate the clinical effects. The puncture angle of thoracic vertebrae in T8-T12 was from 28° to 33° with an average 30.4°; and the puncture angle of lumbar vertebrae in L1-L5 was from 28° to 35° with an average of 31.3°. Postoperative X-rays showed the area ratios of bilateral bone cement was 0.97 ± 0.15. Bilateral diffuse area were basic equal. Postoperative VAS score decreased significantly (1.89 ± 1.29 vs 7.03 ± 1.42). Through measure imaging data before operation with PKP,the puncture point and entry point can be confirmed. According the measured data to puncture during operation, unilateral puncture can reach the distribution effect of the bilateral puncture in the treatment of thoracolumbar compression fractures.

  8. Cerebral ischemia associated with PercuSurge balloon occlusion balloon during carotid stenting: Incidence and possible mechanisms.

    Science.gov (United States)

    Chaer, Rabih A; Trocciola, Susan; DeRubertis, Brian; Lin, Stephanie C; Kent, K Craig; Faries, Peter L

    2006-05-01

    Interruption of antegrade cerebral perfusion results in transient neurologic intolerance in some patients undergoing carotid angioplasty and stenting (CAS). This study sought to evaluate factors that contributed to the development of cerebral ischemia during PercuSurge balloon occlusion and techniques used to allow successful completion of the CAS procedure. The PercuSurge occlusion balloon was used in 43 of 165 patients treated with CAS for high-grade stenosis (mean stenosis, 90%). All 43 patients were at increased risk for endarterectomy (7 restenosis, 3 irradiation, 3 contralateral occlusion, and 30 Goldman class II-III); 20% were symptomatic. Symptoms of cerebral hypoperfusion during temporary occlusion of the internal carotid artery occurred in 10 of 43 and included dysarthria (7/10), agitation (6/10), decreased level of consciousness (5/10), and focal hemispheric deficit (3/10). An incomplete circle of Willis or contralateral carotid artery occlusion, or both, was present in 8 of 10 patients. Symptoms resulting from PercuSurge balloon occlusion were managed by balloon deflation with or without evacuation of blood from the internal carotid artery using the Export catheter. All symptoms resolved completely without deficit after deflation of the occlusion balloon. The development of neurologic symptoms after initial PercuSurge balloon inflation and occluded internal carotid artery flow was associated with a decrease in the mean Glasgow Coma Scale (GCS) from 15 to 10 (range, 9 to 14); the GCS returned to normal after occlusion balloon deflation and remained normal during subsequent reinflation. The mean time to spontaneous recovery of full neurologic function was 8 minutes (range, 4 to 15 minutes). No thrombotic or embolic events were present on cerebral angiography or computed tomography scan. Balloon reinflation was performed after a mean reperfusion interval of 10 minutes after full neurologic recovery (range, 4 to 20 minutes). The mean subsequent procedure

  9. Acoustic Detection from Aerial Balloon Platform

    National Research Council Canada - National Science Library

    Reiff, C; Pham, T; Scanlon, M; Noble, J; Van Landuyt, A; Petek, J; Ratches, J

    2004-01-01

    ... such as unmanned aerial vehicles (UAVs) and balloons. Our most immediate collaboration focuses on the use of acoustic sensors on small balloons and/or aerostats at several elevations and on the ground with the primary goals...

  10. Ileal Varices Treated with Balloon-Occluded Retrograde Transvenous Obliteration.

    Science.gov (United States)

    Sato, Takahiro; Yamazaki, Katsu; Toyota, Jouji; Karino, Yoshiyasu; Ohmura, Takumi; Akaike, Jun

    2009-04-01

    A 55-year-old man with hepatitis B virus antigen-positive liver cirrhosis was admitted to our hospital with anal bleeding. Colonoscopy revealed blood retention in the entire colon, but no bleeding lesion was found. Computed tomography images showed that vessels in the ileum were connected to the right testicular vein, and we suspected ileal varices to be the most probable cause of bleeding. We immediately performed double balloon enteroscopy, but failed to find any site of bleeding owing to the difficulty of fiberscope insertion with sever adhesion. Using a balloon catheter during retrograde transvenous venography, we found ileal varices communicating with the right testicular vein (efferent vein) with the superior mesenteric vein branch as the afferent vein of these varices. We performed balloon occluded retrograde transvenous obliteration by way of the efferent vein of the varices and have detected no further bleeding in this patient one year after treatment.

  11. Complications of balloon packing in epistaxis

    NARCIS (Netherlands)

    Vermeeren, Lenka; Derks, Wynia; Fokkens, Wytske; Menger, Dirk Jan

    2015-01-01

    Although balloon packing appears to be efficient to control epistaxis, severe local complications can occur. We describe four patients with local lesions after balloon packing. Prolonged balloon packing can cause damage to nasal mucosa, septum and alar skin (nasal mucosa, the cartilaginous skeleton

  12. Complex Coronary Interventions with the Novel Mozec™ CTO Balloon: The MOZART Registry.

    Science.gov (United States)

    Lupi, Alessandro; Rognoni, Andrea; Schaffer, Alon; Secco, Gioel G; Bongo, Angelo S

    2015-01-01

    Mozec™ CTO is a novel semicompliant rapid-exchange PTCA balloon catheter with specific features dedicated to treat complex coronary lesions like chronic total occlusions (CTOs). However, no data have been reported about the performance of this device in an all-comers population with complex coronary lesions. We evaluated the safety and success rate of Mozec™ CTO balloon in 41 consecutive patients with chronic stable angina and complex coronary lesions (15 severe calcified coronary stenoses, 15 bifurcation lesions with planned two-stent intervention, and 11 CTOs). Safety was assessed reporting the balloon burst rate after inflation exceeding the rated burst pressure (RBP) according to the manufacturer's reference table. Success was defined as the possibility to advance the device further the target lesion. The Mozec™ CTO balloon showed an excellent performance with a 93.3% success in crossing tight and severely calcified lesions (14/15 pts), a 93.3% success in engaging jailed side branches after stent deployment across bifurcations (14/15 pts), and a 90.9% success in crossing CTO lesions (10/11 pts). The burst rate at RBP of the Mozec™ CTO balloon was 6.7% (1/15 balloons) in the tight and severely calcified lesions, 6.7% (1/15 balloons) when dilating jailed vessels, and 9.1% (1/11 balloons) in CTOs. The novel Mozec™ CTO balloon dilatation catheter showed promising results when employed to treat complex lesions in an all-comers population. Further studies should clarify if this kind of balloon might reduce the need of more costly devices like over-the-wire balloons and microcatheters for complex lesions treatment.

  13. Advances in the Remote Monitoring of Balloon Flights

    Science.gov (United States)

    Breeding, S.

    At the National Scientific Balloon Facility (NSBF), we must staff the Long Duration Balloon (LDB) control center 24 hours a day during LDB flights. This requires three daily shifts of two operators (balloon control and tdrss scheduling). In addition to this we also have one engineer on-call as LDB Lead to resolve technical issues and one manager on-call for flight management. These on-call periods are typically 48 to 72 hours in length. In the past the on-call staff had to travel to the LDB control center in order to monitor the status of a flight in any detail. This becomes problematic as flight durations push out beyond 20 to 30 day lengths, as these staff members are not available for business travel during these periods. This paper describes recent advances which allow for the remote monitoring of scientific balloon flight ground station computer displays. This allows balloon flight managers and lead engineers to check flight status and performance from any location with a network or telephone connection. This capability frees key personnel from the NSBF base during flights. It also allows other interested parties to check on the flight status at their convenience.

  14. Time-dependent strains and stresses in a pumpkin balloon

    Science.gov (United States)

    Gerngross, T.; Xu, Y.; Pellegrino, S.

    This paper presents a study of pumpkin-shaped superpressure balloons consisting of gores made from a thin polymeric film attached to high stiffness meridional tendons This type of design is being used for the NASA ULDB balloons The gore film shows considerable time-dependent stress relaxation whereas the behaviour of the tendons is essentially time-independent Upon inflation and pressurization the instantaneous i e linear-elastic strain and stress distributions in the film show significantly higher values in the meridional direction However over time and due to the biaxial visco-elastic stress relaxation of the the gore material the em hoop strains increase and the em meridional stresses decrease whereas the em remaining strain and stress components remain substantially unchanged These results are important for a correct assessment of the structural integrity of a pumpkin balloon in a long-duration mission both in terms of the material performance and the overall stability of the shape of the balloon An experimental investigation of the time dependence of the biaxial strain distribution in the film of a 4 m diameter 48 gore pumpkin balloon is presented The inflated shape of selected gores has been measured using photogrammetry and the time variation in strain components at some particular points of these gores has been measured under constant pressure and temperature The results show good correlation with a numerical study using the ABAQUS finite-element package that includes a widely used model of

  15. Simulating clefts in pumpkin balloons

    Science.gov (United States)

    Baginski, Frank; Brakke, Kenneth

    2010-02-01

    The geometry of a large axisymmetric balloon with positive differential pressure, such as a sphere, leads to very high film stresses. These stresses can be significantly reduced by using a tendon re-enforced lobed pumpkin-like shape. A number of schemes have been proposed to achieve a cyclically symmetric pumpkin shape, including the constant bulge angle (CBA) design, the constant bulge radius (CBR) design, CBA/CBR hybrids, and NASA’s recent constant stress (CS) design. Utilizing a hybrid CBA/CBR pumpkin design, Flight 555-NT in June 2006 formed an S-cleft and was unable to fully deploy. In order to better understand the S-cleft phenomenon, a series of inflation tests involving four 27-m diameter 200-gore pumpkin balloons were conducted in 2007. One of the test vehicles was a 1/3-scale mockup of the Flight 555-NT balloon. Using an inflation procedure intended to mimic ascent, the 1/3-scale mockup developed an S-cleft feature strikingly similar to the one observed in Flight 555-NT. Our analysis of the 1/3-scale mockup found it to be unstable. We compute asymmetric equilibrium configurations of this balloon, including shapes with an S-cleft feature.

  16. Stability of the pumpkin balloon

    Science.gov (United States)

    Baginski, Frank

    A large axisymmetric balloon with positive differential pressure, e.g., a sphere, leads to high film stresses. These can be significantly reduced by using a lobed pumpkin-like shape re-enforced with tendons. A number of schemes have been proposed to achieve a cyclically symmetric pumpkin-shape at full inflation, including the constant bulge angle (CBA) design and the constant bulge radius (CBR) design. The authors and others have carried out stability studies of CBA and CBR designs and found instabilities under various conditions. While stability seems to be a good indicator of deployment problems for large balloons under normal ascent conditions, one cannot conclude that a stable design will deploy reliably. Nevertheless, stability analysis allows one to quantify certain deployment characteristics. Ongoing research by NASA's Balloon Program Office utilizes a new design approach developed by Rodger Farley, NASA/GSFC, that takes into account film and tendon strain. We refer to such a balloon as a constant stress (CS) pumpkin design. In June 2006, the Flight 555-NT balloon (based on a hybrid CBR/CBA design) developed an S-cleft and did not deploy. In order to understand the S-cleft phenomena and study a number of aspects related to the CS-design, a series of inflation tests were conducted at TCOM, Elizabeth City, NC in 2007. The test vehicles were 27 meter diameter pumpkins distinguished by their respective equatorial bulge angles (BA). For example, BA98 indicates an equatorial bulge angle of 98° . BA90, BA55, and BA00 are similarly defined. BA98 was essentially a one-third scale version of of the Flight 555 balloon (i.e., 12 micron film instead of 38.1 micron, mini-tendons, etc.). BA90 and BA55 were Farley CS-designs. BA00 was derived from the BA55 design so that a flat chord spanned adjacent tendons. In this paper, we will carry out stability studies of BA98, BA90, BA55, and BA00. We discuss the deployment problem of pumpkin balloons in light of 2007 inflation

  17. The German scientific balloon and sounding rocket programme

    International Nuclear Information System (INIS)

    Dahl, A.F.

    1980-01-01

    This report contains information on sounding rocket projects in the scientific field of astronomy, aeronomy, magnetosphere, and material science under microgravity. The scientific balloon projects are performed with emphasis on astronomical research. By means of tables it is attempted to give a survey, as complete as possible, of the projects the time since the last symposium in Ajaccio, Corsica, and of preparations and plans for the future until 1983. The scientific balloon and sounding rocket projects form a small successful part of the German space research programme. (Auth.)

  18. Planetary Science with Balloon-Borne Telescopes

    Science.gov (United States)

    Kremic, Tibor; Cheng, Andy; Hibbitts, Karl; Young, Eliot

    2015-01-01

    The National Aeronautics and Space Administration (NASA) and the planetary science community have recently been exploring the potential contributions of stratospheric balloons to the planetary science field. A study that was recently concluded explored the roughly 200 or so science questions raised in the Planetary Decadal Survey report and found that about 45 of those questions are suited to stratospheric balloon based observations. In September of 2014, a stratospheric balloon mission called BOPPS (which stands for Balloon Observation Platform for Planetary Science) was flown out of Fort Sumner, New Mexico. The mission had two main objectives, first, to observe a number of planetary targets including one or more Oort cloud comets and second, to demonstrate the applicability and performance of the platform, instruments, and subsystems for making scientific measurements in support planetary science objectives. BOPPS carried two science instruments, BIRC and UVVis. BIRC is a cryogenic infrared multispectral imager which can image in the.6-5 m range using an HgCdTe detector. Narrow band filters were used to allow detection of water and CO2 emission features of the observed targets. The UVVis is an imager with the science range of 300 to 600 nm. A main feature of the UVVis instrument is the incorporation of a guide camera and a Fine Steering Mirror (FSM) system to reduce image jitter to less than 100 milliarcseconds. The BIRC instrument was used to image targets including Oort cloud comets Siding Spring and Jacques, and the dwarf planet 1 Ceres. BOPPS achieved the first ever earth based CO2 observation of a comet and the first images of water and CO2 of an Oort cloud comet (Jacques). It also made the first ever measurement of 1Ceres at 2.73 m to refine the shape of the infrared water absorption feature on that body. The UVVis instrument, mounted on its own optics bench, demonstrated the capability for image correction both from atmospheric disturbances as well as some

  19. Scientific ballooning: Past, present and future

    Science.gov (United States)

    Jones, W. Vernon

    2013-02-01

    Balloons have been used for scientific research since they were invented in France more than 200 years ago. Cosmic rays were discovered 100 years ago with an experiment flown on a manned balloon. A major change in balloon design occurred in 1950 with the introduction of the socalled natural shape balloon with integral load tapes. This basic design has been used with more or less continuously improved materials for scientific balloon flights for the past half century, including long-duration balloon (LDB) flights around Antarctica for the past two decades. The U.S. National Aeronautics and Space Administration (NASA) is currently developing a super-pressure balloon that would enable extended duration missions above 99.5% of the Earth's atmosphere at any latitude. Ultra-long-duration balloon (ULDB) flights enabled by constant-volume balloons should result in an even greater sea change in scientific ballooning than the inauguration of long-duration balloon (LDB) flights in Antarctica during the 1990-91 austral summer.

  20. Balloon atrial septostomy under echocardiographic guide: case series

    Directory of Open Access Journals (Sweden)

    SM Meraji

    2012-12-01

    Full Text Available Background: Balloon atrial septostomy is an emergent procedure in pediatric cardiology. Nowadays, most patients in need of the procedure have acceptable outcomes after surgical repair. Thus, it is important to perform this procedure as safe as possible. By performing early arterial switch operation and prostaglandin infusion, the rate of balloon atrial septostomy has markedly decreased. However, not all centers performing early arterial switch repairs have abandoned atrial septostomy, even in patients who respond favorably to prostaglandin infusion.Case presentation: In total, eight 1- to 15-day old term neonates admitted in Shahid Rajaee Heart Center in Tehran, Iran from October 2009 to February 2011, with congenital heart diseases were scheduled for balloon atrial septostomy. In six cases the procedure was done exclusively under echocardiographic guidance and in two cases with the help of fluoroscopy. Success was defined as the creation of an atrial septal defect with a diameter equal to or more than 5 mm and ample mobility of its margins.Results: Male sex was predominant (87% and the mean age of the neonates was six days. The diagnosis in all cases was simple transposition of great arteries. The procedure was successful in all patients with any cardiovascular complication.Conclusion: Balloon atrial septostomy is an emergent procedure that can be done safely and effectively under echocardiographic guidance. According to the feasibility of this technique it could be performed fast, safe and effective at bedside, avoiding patient transportation to hemodynamic laboratory or referral center.

  1. Balloon valvuloplasty for severe mitral valve stenosis in pregnancy ...

    African Journals Online (AJOL)

    Balloon valvuloplasties for severe mitral stenosis were performed on 11 pregnant patients with excellent resutts and no complications. The mitral valve area was increased from a mean of 0.9 cnr to 2.1 cnr. There was no clinically significant mitral regurgitation. The pregnancies proceeded normally to delivery at or near tenn, ...

  2. Reduction of the domino effect in osteoporotic vertebral compression fractures through short-segment fixation with intravertebral expandable pillars compared to percutaneous kyphoplasty: a case control study

    OpenAIRE

    Hsieh, Jui-Yang; Wu, Chung-Ding; Wang, Ting-Ming; Chen, Hsuan-Yu; Farn, Chui-Jia; Chen, Po-Quang

    2013-01-01

    Background Osteoporotic vertebral compression fracture is the leading cause of disability and morbidity in elderly people. Treatment of this condition remains a challenge. Osteoporotic vertebral compression fractures can be managed with various approaches, but each has limitations. In this study, we compared the clinical outcomes obtained using short-segment fixation with intravertebral expandable pillars (I-VEP) to those obtained with percutaneous kyphoplasty in patients who had suffered ver...

  3. Impact of contrast agent viscosity on coronary balloon deflation times: bench testing results.

    Science.gov (United States)

    Mogabgab, Owen; Patel, Vishal G; Michael, Tesfaldet T; Kotsia, Anna; Christopoulos, George; Banerjee, Subhash; Brilakis, Emmanouil S

    2014-04-01

    To assess the impact of viscosity on angioplasty balloon deflation times. Lower contrast viscosity could result in more rapid coronary balloon deflation times. We performed a bench comparison of coronary balloon deflation times using 2 contrast agents with different viscosity (ioxaglate and iodixanol), 3 contrast dilutions, and 2 inflation syringe filling volumes. Ten identical pairs of coronary angioplasty balloons were used to conduct each comparison after balloon inflation to 12 atmospheres. Simultaneous deflations were performed under cineangiography. The time to full contrast extraction and the area of contrast remaining after 5 seconds of deflation (quantified by opaque pixel count) were compared between groups. The mean time to full contrast extraction during balloon deflation was 8.3 ± 2.5 seconds for ioxaglate (lower viscosity) versus 10.1 ± 2.9 seconds for iodixanol (higher viscosity) (17.4% decrease, P = 0.005), with a 35.6% (P = 0.004) reduction in contrast area at 5 seconds. Compared to 1:1 ioxaglate-saline mixture, 1:2 and 1:3 ioxaglate/saline mixes resulted in 26.7% (P deflation time, respectively, but at the expense of decreased balloon opacity. Filling the inflation syringe with 5 versus 15 ml of contrast/saline solution was associated with 7.5% decrease in balloon deflation time (P = 0.005), but no difference in contrast area at 5 seconds (P = 0.749). Use of a lower viscosity contrast agent and higher contrast dilution significantly reduced coronary balloon deflation times, whereas use of lower syringe filling volume had a modest effect. Rapid coronary balloon deflation could improve the safety of interventional procedures. © 2014 Wiley Periodicals, Inc.

  4. Development of scientific ballooning in Japan

    Science.gov (United States)

    Nishimura, Jun

    On the occasion of the 50th Anniversary Celebration of COSPAR of this year of 2008, it is worthwhile to summarize the results of the Scientific ballooning in early days in connection with the recent developments in various countries. Nishina Laboratories, Riken, had started the observations of cosmic rays with rubber balloons as early as 1942. However it was interrupted soon by the war II. After the war, new research group started in collaboration with several universities with nuclear emulsions put on the rubber balloons in 1950, and then soon after the group manufactured by themselves and launched the first plastic balloon in 1953. Based on additional technologies during a few years developed by these group, the Institute of Nuclear Study, INS, the University of Tokyo, organized the large campaign of 14 emulsion chambers and a pellicle stack with 8 plastic balloons in 1956. It is to be noted that the project was one of the largest in the world standard in those days. By the experience of this campaign, the importance of the balloon technologies was more recognized, and INS organized the group to study the balloon technologies, and had established some developments. The systematic study of scientific ballooning has started, when the scientific ballooning laboratory was founded in 1965, in the new Institute of ISAS, the University of Tokyo. The permanent balloon base of "Sanriku Balloon Center" was founded in 1971. This group has expended all efforts for the scientific ballooning, launching 10-20 balloons in each year with new inventions such as the studies of; Technologies to manufacture the reliable plastic balloons, New Balloon materials, New instrumentations for scientific ballooning, Systems of long duration flights including Antarctica flights, International collaboratiom, etc. Up to now almost 600 plastic balloons were launched during past 50 years. Then the scientific balloonings have played important and indispensable roles for the development of space

  5. Underexpansion and Ad Hoc Post-dilation in Selected Patients Undergoing Balloon-Expandable Transcatheter Aortic Valve Replacement

    DEFF Research Database (Denmark)

    Barbanti, Marco; Leipsic, Jonathon; Binder, Ronald

    2014-01-01

    To assess the clinical outcomes and hemodynamic performance associated with a strategy of underexpanding balloon-expandable THVs when excessive oversizing is a concern.......To assess the clinical outcomes and hemodynamic performance associated with a strategy of underexpanding balloon-expandable THVs when excessive oversizing is a concern....

  6. Viscoelastic behaviour of pumpkin balloons

    Science.gov (United States)

    Gerngross, T.; Xu, Y.; Pellegrino, S.

    2008-11-01

    The lobes of the NASA ULDB pumpkin-shaped super-pressure balloons are made of a thin polymeric film that shows considerable time-dependent behaviour. A nonlinear viscoelastic model based on experimental measurements has been recently established for this film. This paper presents a simulation of the viscoelastic behaviour of ULDB balloons with the finite element software ABAQUS. First, the standard viscoelastic modelling capabilities available in ABAQUS are examined, but are found of limited accuracy even for the case of simple uniaxial creep tests on ULDB films. Then, a nonlinear viscoelastic constitutive model is implemented by means of a user-defined subroutine. This approach is verified by means of biaxial creep experiments on pressurized cylinders and is found to be accurate provided that the film anisotropy is also included in the model. A preliminary set of predictions for a single lobe of a ULDB is presented at the end of the paper. It indicates that time-dependent effects in a balloon structure can lead to significant stress redistribution and large increases in the transverse strains in the lobes.

  7. Efficacy of Intrauterine Bakri Balloon Tamponade in Cesarean Section for Placenta Previa Patients.

    Directory of Open Access Journals (Sweden)

    Hee Young Cho

    Full Text Available The aims of this study were to analyze the predictive factors for the use of intrauterine balloon insertion and to evaluate the efficacy and factors affecting failure of uterine tamponade with a Bakri balloon during cesarean section for abnormal placentation.We reviewed the medical records of 137 patients who underwent elective cesarean section for placenta previa between July 2009 and March 2014. Cesarean section and Bakri balloon insertion were performed by a single qualified surgeon. The Bakri balloon was applied when blood loss during cesarean delivery exceeded 1,000 mL.Sixty-four patients (46.7% required uterine balloon tamponade during cesarean section due to postpartum bleeding from the lower uterine segment, of whom 50 (78.1% had placenta previa totalis. The overall success rate was 75% (48/64 for placenta previa patients. Previous cesarean section history, anterior placenta, peripartum platelet count, and disseminated intravascular coagulopathy all significantly differed according to balloon success or failure (all p<0.05. The drainage amount over 1 hour was 500 mL (20-1200 mL in the balloon failure group and 60 mL (5-500 mL in the balloon success group (p<0.01.Intrauterine tamponade with a Bakri balloon is an adequate adjunct management for postpartum hemorrhage following cesarean section for placenta previa to preserve the uterus. This method is simple to apply, non-invasive, and inexpensive. However, possible factors related to failure of Bakri balloon tamponade for placenta previa patients such as prior cesarean section history, anterior placentation, thrombocytopenia, presence of DIC at the time of catheter insertion, and catheter drainage volume more than 500 mL within 1 hour of catheter placement should be recognized, and the next-line management should be prepared in advance.

  8. Titan Balloon Convection Model, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — This innovative research effort is directed at determining, quantitatively, the convective heat transfer coefficients applicable to a Montgolfiere balloon operating...

  9. Detecting Seismic Infrasound Signals on Balloon Platforms

    Science.gov (United States)

    Krishnamoorthy, S.; Komjathy, A.; Cutts, J. A.; Pauken, M.; Garcia, R.; Mimoun, D.; Jackson, J. M.; Kedar, S.; Smrekar, S. E.; Hall, J. L.

    2017-12-01

    The determination of the interior structure of a planet requires detailed seismic investigations - a process that entails the detection and characterization of seismic waves due to geological activities (e.g., earthquakes, volcanoes, etc.). For decades, this task has primarily been performed on Earth by an ever-expanding network of terrestrial seismic stations. However, on planets such as Venus, where the surface pressure and temperature can reach as high as 90 atmospheres and 450 degrees Celsius respectively, placing seismometers on the planet's surface poses a vexing technological challenge. However, the upper layers of the Venusian atmosphere are more benign and capable of hosting geophysical payloads for longer mission lifetimes. In order to achieve the aim of performing geophysical experiments from an atmospheric platform, JPL and its partners (ISAE-SUPAERO and California Institute of Technology) are in the process of developing technologies for detection of infrasonic waves generated by earthquakes from a balloon. The coupling of seismic energy into the atmosphere critically depends on the density differential between the surface of the planet and the atmosphere. Therefore, the successful demonstration of this technique on Earth would provide ample reason to expect success on Venus, where the atmospheric impedance is approximately 60 times that of Earth. In this presentation, we will share results from the first set of Earth-based balloon experiments performed in Pahrump, Nevada in June 2017. These tests involved the generation of artificial sources of known intensity using a seismic hammer and their detection using a complex network of sensors, including highly sensitive micro-barometers suspended from balloons, GPS receivers, geophones, microphones, and seismometers. This experiment was the first of its kind and was successful in detecting infrasonic waves from the earthquakes generated by the seismic hammer. We will present the first comprehensive analysis

  10. Microcontroller uses in Long-Duration Ballooning

    Science.gov (United States)

    Jones, Joseph

    This paper discusses how microcontrollers are being utilized to fulfill the demands of long duration ballooning (LDB) and the advantages of doing so. The Columbia Scientific Balloon Facility (CSBF) offers the service of launching high altitude balloons (120k ft) which provide an over the horizon telemetry system and platform for scientific research payloads to collect data. CSBF has utilized microcontrollers to address multiple tasks and functions which were previously performed by more complex systems. A microcontroller system has been recently developed and programmed in house to replace our previous backup navigation system which is used on all LDB flights. A similar microcontroller system was developed to be independently launched in Antarctica before the actual scientific payload. This system's function is to transmit its GPS position and a small housekeeping packet so that we can confirm the upper level float winds are as predicted from satellite derived models. Microcontrollers have also been used to create test equipment to functionally check out the flight hardware used in our telemetry systems. One test system which was developed can be used to quickly determine if our communication link we are providing for the science payloads is functioning properly. Another system was developed to provide us with the ability to easily determine the status of one of our over the horizon communication links through a closed loop system. This test system has given us the capability to provide more field support to science groups than we were able to in years past. The trend of utilizing microcontrollers has taken place for a number of reasons. By using microcontrollers to fill these needs, it has given us the ability to quickly design and implement systems which meet flight critical needs, as well as perform many of the everyday tasks in LDB. This route has also allowed us to reduce the amount of time required for personnel to perform a number of the tasks required

  11. Balloon dacryocystoplasty study in the management of adult epiphora.

    LENUS (Irish Health Repository)

    Fenton, S

    2012-02-03

    PURPOSE: To determine the efficacy of dacryocystoplasty with balloon dilation in the treatment of acquired obstruction of the nasolacrimal system in adults. METHODS: Balloon dacryocystoplasty was performed in 52 eyes of 42 patients under general anaesthetic. A Teflon-coated guidewire was introduced through the canaliculus and manipulated through the nasolacrimal system and out of the nasal aperture. A 4 mm wide 3 cm coronary angioplasty balloon catheter was threaded over the guidewire in a retrograde fashion and dilated at the site of obstruction. RESULTS: There was complete obstruction in 30% of cases and partial obstruction in 70%. The most common site of obstruction was the nasolacrimal duct. The procedure was technically successful in 94% of cases. The overall re-obstruction rate was 29% within 1 year of the procedure. There was an anatomical failure rate of 17% for partial obstruction and 69% for complete obstruction within 1 year. CONCLUSIONS: Balloon dacryocystoplasty has a high recurrence rate. There may be a limited role for this procedure in partial obstructions. Further refinements of the procedure are necessary before it can be offered as a comparable alternative to a standard surgical dacryocystorhinostomy.

  12. Latex Micro-balloon Pumping in Centrifugal Microfluidic Platforms

    Science.gov (United States)

    Aeinehvand, Mohammad Mahdi; Ibrahim, Fatimah; Al-Faqheri, Wisam; Thio, Tzer Hwai Gilbert; Kazemzadeh, Amin; Wadi harun, Sulaiman; Madou, Marc

    2014-01-01

    Centrifugal microfluidic platforms have emerged as point-of-care diagnostic tools. However, the unidirectional nature of the centrifugal force limits the available space for multi-stepped processes on a single microfluidics disc. To overcome this limitation, a passive pneumatic pumping method actuated at high rotational speeds has been previously proposed to pump liquid against the centrifugal force. In this paper, a novel micro-balloon pumping method that relies on elastic energy stored in a latex membrane is introduced. It operates at low rotational speeds and pumps a larger volume of liquid towards the centre of the disc. Two different micro-balloon pumping designs have been developed to study the pump performance and capacity at a range of rotational frequencies from 0 to 1500 rpm. The behaviour of the micro-balloon pump on the centrifugal microfluidic platforms has been theoretically analysed and compared with the experimental data. The experimental data shows that, the developed pumping method dramatically decreases the required rotational speed to pump liquid compared to the previously developed pneumatic pumping methods. It also shows that within a range of rotational speed, desirable volume of liquid can be stored and pumped by adjusting the size of the micro-balloon. PMID:24441792

  13. Transthoracic ultrasound guided balloon dilation of cor triatriatum dexter in 2 Rottweiler puppies.

    Science.gov (United States)

    Birettoni, F; Caivano, D; Bufalari, A; Giorgi, M E; Miglio, A; Paradies, P; Porciello, F

    2016-12-01

    Balloon dilation was performed in two Rottweiler puppies with cor triatriatum dexter and clinical signs of ascites using transthoracic echocardiographic guidance. The dogs were positioned on a standard echocardiography table in right lateral recumbency, and guide wires and balloon catheters were imaged by echocardiographic views optimized to allow visualization of the defect. The procedures were performed successfully without complications and clinical signs were resolved completely in both cases. Guide wires and balloon catheters appeared hyperechoic on transthoracic echocardiography image and could be clearly monitored and guided in real-time. These two cases demonstrate that it is possible to perform balloon catheter dilation of cor triatriatum dexter under transthoracic guidance alone. Copyright © 2016 Elsevier B.V. All rights reserved.

  14. Change in Imaging Findings on Angiography-Assisted CT During Balloon-Occluded Transcatheter Arterial Chemoembolization for Hepatocellular Carcinoma

    Energy Technology Data Exchange (ETDEWEB)

    Yoshimatsu, Rika [Hiroshima University, Department of Diagnostic Radiology, Institute and Graduate School of Biomedical Sciences (Japan); Yamagami, Takuji, E-mail: yamagami@kochi-u.ac.jp [Kochi University, Department of Radiology (Japan); Ishikawa, Masaki; Kajiwara, Kenji [Hiroshima University, Department of Diagnostic Radiology, Institute and Graduate School of Biomedical Sciences (Japan); Aikata, Hiroshi; Chayama, Kazuaki [Hiroshima University, Department of Gastroenterology and Metabolism, Institute of Biomedical and Health Sciences (Japan); Awai, Kazuo [Hiroshima University, Department of Diagnostic Radiology, Institute and Graduate School of Biomedical Sciences (Japan)

    2016-06-15

    PurposeTo evaluate changes in imaging findings on CT during hepatic arteriography (CTHA) and CT during arterial portography (CTAP) by balloon occlusion of the treated artery and their relationship with iodized oil accumulation in the tumor during balloon-occluded transcatheter arterial chemoembolization (B-TACE).MethodsBoth B-TACE and angiography-assisted CT were performed for 27 hepatocellular carcinomas. Tumor enhancement on selective CTHA with/without balloon occlusion and iodized oil accumulation after B-TACE were evaluated. Tumorous portal perfusion defect size on CTAP was compared with/without balloon occlusion. Factors influencing discrepancies between selective CTHA with/without balloon occlusion and the degree of iodized oil accumulation were investigated.ResultsAmong 27 tumors, tumor enhancement on selective CTHA changed after balloon occlusion in 14 (decreased, 11; increased, 3). In 18 tumors, there was a discrepancy between tumor enhancement on selective CTHA with balloon occlusion and the degree of accumulated iodized oil, which was higher than the tumor enhancement grade in all 18. The tumorous portal perfusion defect on CTAP significantly decreased after balloon occlusion in 18 of 20 tumors (mean decrease from 21.9 to 19.1 mm in diameter; p = 0.0001). No significant factors influenced discrepancies between selective CTHA with/without balloon occlusion. Central area tumor location, poor tumor enhancement on selective CTHA with balloon occlusion, and no decrease in the tumorous portal perfusion defect area on CTAP after balloon occlusion significantly influenced poor iodized oil accumulation in the tumor.ConclusionsTumor enhancement on selective CTHA frequently changed after balloon occlusion, which did not correspond to accumulated iodized oil in most cases.

  15. High Energy Antimatter Telescope (HEAT) Balloon Experiment

    Science.gov (United States)

    Beatty, J. J.

    1995-01-01

    This grant supported our work on the High Energy Antimatter Telescope(HEAT) balloon experiment. The HEAT payload is designed to perform a series of experiments focusing on the cosmic ray positron, electron, and antiprotons. Thus far two flights of the HEAT -e+/- configuration have taken place. During the period of this grant major accomplishments included the following: (1) Publication of the first results of the 1994 HEAT-e+/- flight in Physical Review Letters; (2) Successful reflight of the HEAT-e+/- payload from Lynn Lake in August 1995; (3) Repair and refurbishment of the elements of the HEAT payload damaged during the landing following the 1995 flight; and (4) Upgrade of the ground support equipment for future flights of the HEAT payload.

  16. Balloon dilatations of esophageal strictures

    Energy Technology Data Exchange (ETDEWEB)

    Seo, Jeong Jin; Juhng, Seon Kwan; Kim, Jae Kyu; Chung, Hyon De [Chonnam National University College of Medicine, Seoul (Korea, Republic of)

    1990-04-15

    Most benign esophageal strictures can be successfully dilated with conventional bougienage technique. But occasionally strictures are so tight, lengthy, or sometimes irregular that this technique fail, and surgical intervention is required. Since 1974 Gruentzig balloon catheter has succeed when used for strictures in the cardiac and peripheral vasculatures, the biliary and urinary tracts, the colon of neonates after inflammatory disease and also in the esophagus. Fluoroscopically guided balloon catheters were used to dilate 30 esophageal strictures in 30 patients over 3 years at Department of Diagnostic Radiology, Chonnam University, College of Medicine. The distribution of age was from 7 years to 71 days and the ratio of male to female was 15:15. The causes of benign stricture (23 cases) were post-operative strictures (13), chemical (4), achalasia (3), chronic inflammation (2), esophageal rupture (1) and those of malignant stricture (7 cases) were post-radiation stricture of primary esophageal cancer (6) and metastatic esophageal cancer (1). The success rate of procedure was 93% (28/30). The causes of failure were the failure of passage of stricture due to markedly dilated proximal segment of esophagus (1 case) and too long segment of stricture (1 case). Complication of procedure was the diverticular-formation of esophagus in 3 cases, but has no clinical significance in follow-up esophagography. In conclusion, fluoroscopically guided balloon dilation of esophageal stricture appears to be safe, effective treatment and may be have theoretical advantages over conventional bougienage and also should be considered before other methods of treatment are used.

  17. Balloon dilatations of esophageal strictures

    International Nuclear Information System (INIS)

    Seo, Jeong Jin; Juhng, Seon Kwan; Kim, Jae Kyu; Chung, Hyon De

    1990-01-01

    Most benign esophageal strictures can be successfully dilated with conventional bougienage technique. But occasionally strictures are so tight, lengthy, or sometimes irregular that this technique fail, and surgical intervention is required. Since 1974 Gruentzig balloon catheter has succeed when used for strictures in the cardiac and peripheral vasculatures, the biliary and urinary tracts, the colon of neonates after inflammatory disease and also in the esophagus. Fluoroscopically guided balloon catheters were used to dilate 30 esophageal strictures in 30 patients over 3 years at Department of Diagnostic Radiology, Chonnam University, College of Medicine. The distribution of age was from 7 years to 71 days and the ratio of male to female was 15:15. The causes of benign stricture (23 cases) were post-operative strictures (13), chemical (4), achalasia (3), chronic inflammation (2), esophageal rupture (1) and those of malignant stricture (7 cases) were post-radiation stricture of primary esophageal cancer (6) and metastatic esophageal cancer (1). The success rate of procedure was 93% (28/30). The causes of failure were the failure of passage of stricture due to markedly dilated proximal segment of esophagus (1 case) and too long segment of stricture (1 case). Complication of procedure was the diverticular-formation of esophagus in 3 cases, but has no clinical significance in follow-up esophagography. In conclusion, fluoroscopically guided balloon dilation of esophageal stricture appears to be safe, effective treatment and may be have theoretical advantages over conventional bougienage and also should be considered before other methods of treatment are used

  18. Haemodynamic changes in hepatocellular carcinoma and liver parenchyma under balloon occlusion of the hepatic artery

    Energy Technology Data Exchange (ETDEWEB)

    Sugihara, Fumie; Murata, Satoru; Ueda, Tatsuo; Yasui, Daisuke; Yamaguchi, Hidenori; Miki, Izumi; Kumita, Shin-ichiro [Nippon Medical School, Department of Radiology, Center for Advanced Medical Technology, Tokyo (Japan); Kawamoto, Chiaki [Nippon Medical School, Department of Internal Medicine, Tokyo (Japan); Uchida, Eiji [Nippon Medical School, Department of Surgery, Tokyo (Japan)

    2017-06-15

    To investigate haemodynamic changes in hepatocellular carcinoma (HCC) and liver under hepatic artery occlusion. Thirty-eight HCC nodules in 25 patients were included. Computed tomography (CT) during hepatic arteriography (CTHA) with and without balloon occlusion of the hepatic artery was performed. CT attenuation and enhancement volume of HCC and liver with and without balloon occlusion were measured on CTHA. Influence of balloon position (segmental or subsegmental branch) was evaluated based on differences in HCC-to-liver attenuation ratio (H/L ratio) and enhancement volume of HCC and liver. In the segmental group (n = 20), H/L ratio and enhancement volume of HCC and liver were significantly lower with balloon occlusion than without balloon occlusion. However, in the subsegmental group (n = 18), H/L ratio was significantly higher and liver enhancement volume was significantly lower with balloon occlusion; HCC enhancement volume was similar with and without balloon occlusion. Rate of change in H/L ratio and enhancement volume of HCC and liver were lower in the segmental group than in the subsegmental group. There were significantly more perfusion defects in HCC in the segmental group. Hepatic artery occlusion causes haemodynamic changes in HCC and liver, especially with segmental occlusion. (orig.)

  19. Efficacy of Intrauterine Bakri Balloon Tamponade in Cesarean Section for Placenta Previa Patients.

    Science.gov (United States)

    Cho, Hee Young; Park, Yong Won; Kim, Young Han; Jung, Inkyung; Kwon, Ja-Young

    2015-01-01

    The aims of this study were to analyze the predictive factors for the use of intrauterine balloon insertion and to evaluate the efficacy and factors affecting failure of uterine tamponade with a Bakri balloon during cesarean section for abnormal placentation. We reviewed the medical records of 137 patients who underwent elective cesarean section for placenta previa between July 2009 and March 2014. Cesarean section and Bakri balloon insertion were performed by a single qualified surgeon. The Bakri balloon was applied when blood loss during cesarean delivery exceeded 1,000 mL. Sixty-four patients (46.7%) required uterine balloon tamponade during cesarean section due to postpartum bleeding from the lower uterine segment, of whom 50 (78.1%) had placenta previa totalis. The overall success rate was 75% (48/64) for placenta previa patients. Previous cesarean section history, anterior placenta, peripartum platelet count, and disseminated intravascular coagulopathy all significantly differed according to balloon success or failure (all pplacenta previa to preserve the uterus. This method is simple to apply, non-invasive, and inexpensive. However, possible factors related to failure of Bakri balloon tamponade for placenta previa patients such as prior cesarean section history, anterior placentation, thrombocytopenia, presence of DIC at the time of catheter insertion, and catheter drainage volume more than 500 mL within 1 hour of catheter placement should be recognized, and the next-line management should be prepared in advance.

  20. Haemodynamic changes in hepatocellular carcinoma and liver parenchyma under balloon occlusion of the hepatic artery

    International Nuclear Information System (INIS)

    Sugihara, Fumie; Murata, Satoru; Ueda, Tatsuo; Yasui, Daisuke; Yamaguchi, Hidenori; Miki, Izumi; Kumita, Shin-ichiro; Kawamoto, Chiaki; Uchida, Eiji

    2017-01-01

    To investigate haemodynamic changes in hepatocellular carcinoma (HCC) and liver under hepatic artery occlusion. Thirty-eight HCC nodules in 25 patients were included. Computed tomography (CT) during hepatic arteriography (CTHA) with and without balloon occlusion of the hepatic artery was performed. CT attenuation and enhancement volume of HCC and liver with and without balloon occlusion were measured on CTHA. Influence of balloon position (segmental or subsegmental branch) was evaluated based on differences in HCC-to-liver attenuation ratio (H/L ratio) and enhancement volume of HCC and liver. In the segmental group (n = 20), H/L ratio and enhancement volume of HCC and liver were significantly lower with balloon occlusion than without balloon occlusion. However, in the subsegmental group (n = 18), H/L ratio was significantly higher and liver enhancement volume was significantly lower with balloon occlusion; HCC enhancement volume was similar with and without balloon occlusion. Rate of change in H/L ratio and enhancement volume of HCC and liver were lower in the segmental group than in the subsegmental group. There were significantly more perfusion defects in HCC in the segmental group. Hepatic artery occlusion causes haemodynamic changes in HCC and liver, especially with segmental occlusion. (orig.)

  1. Nonradiation ERCP with endoscopic biliary sphincterotomy plus papillary balloon dilation for the treatment of choledocholithiasis during pregnancy.

    Science.gov (United States)

    Ersoz, Galip; Turan, Ilker; Tekin, Fatih; Ozutemiz, Omer; Tekesin, Oktay

    2016-01-01

    Endoscopic retrograde cholangiopancreatography (ERCP) is currently the treatment of choice for symptomatic choledocholithiasis in pregnant patients. We aimed to present our experience with pregnant patients who underwent nonradiation ERCP and to evaluate the safety and efficacy of a new technique. A retrospective analysis of nonradiation ERCP in 22 pregnant patients with symptomatic choledocholithiasis between January 2002 and December 2013 was performed. The bile aspiration technique with wire-guided sphincterotome was used to confirm selective biliary cannulation. Transpapillary pancreatic septotomy was performed in cases with difficult biliary cannulation (n = 3). After endoscopic biliary sphincterotomy, endoscopic papillary balloon dilation was performed with a 6- or 8-mm dilation balloon in all patients to reduce the risk of recurrent cholangitis because of residual or additional stones. Stones were extracted by balloon sweeping after dilation. All patients were followed for 6 months after the ERCP procedure. Biliary cannulation was achieved in all patients. Endoscopic papillary balloon dilation was performed with a 6-mm balloon in 17 patients and an 8-mm balloon in five patients. The stones were extracted in 18 of the 22 patients by balloon sweeping, but no stones were extracted in the remaining four patients. There were two cases of mild post-ERCP pancreatitis. All patients delivered at term, and none experienced recurrence of choledocholithiasis and/or cholangitis during the 6-month follow-up. Endoscopic biliary sphincterotomy plus endoscopic papillary balloon dilation in nonradiation ERCP is a safe and effective treatment method for symptomatic choledocholithiasis during pregnancy.

  2. The MIPAS balloon borne trace constitutent experiment

    Science.gov (United States)

    Oelhaf, H.; Vonclarmann, TH.; Fischer, H.; Friedl-Vallon, F.; Fritzsche, CHR.; Piesch, CHR.; Rabus, D.; Seefeldner, M.; Voelker, W.

    1994-01-01

    A novel cryogenic Fourier transform spectrometer (FTS) has been developed for limb emission measurements in the mid IR-region from balloon-borne platforms. The FTS is a rapid scanning interferometer using a modified Michelson arrangement which allows a spectral resolution of 0.04 cm(exp -1) to be achieved. Solid carbon-dioxide cooling of the spectrometer and liquid-helium cooling of the detectors provide adequate sensitivity. The line of sight can be stabilized in terms of azimuth and elevation. A three-mirror off-axis telescope provides good vertical resolution and straylight rejection. Calibration is performed by high elevation and internal blackbody measurements. Four balloon flights were performed, two of them during spring turn-around 1989 and 1990 over mid-latitudes (Aire sur L'Adour, France, 44 deg N) and two near the northern polar circle in winter 1992 (Esrange, Sweden, 68 deg N). Limb emission spectra were collected from 32 km to 39 km floating altitudes covering tangent heights between the lower troposphere and the floating altitude. The trace gases CO2, H2O, O3, CH4, N2O, HNO3, N2O5, ClONO2, CF2Cl2, CFCl3, CHF2Cl, CCl4, and C2H6 have been identified in the measured spectra. The 1989 data have been analyzed to retrieve profiles of O3, HNO3, CFCl3 and CF2Cl2. The flights over Kiruna have provided the first ever reported profile measurements of the key reservoir species ClONO2 and N2O5 inside the polar vortex.

  3. Lightweight Liquid Helium Dewar for High-Altitude Balloon Payloads

    Science.gov (United States)

    Kogut, Alan; James, Bryan; Fixsen, Dale

    2013-01-01

    Astrophysical observations at millimeter wavelengths require large (2-to-5- meter diameter) telescopes carried to altitudes above 35 km by scientific research balloons. The scientific performance is greatly enhanced if the telescope is cooled to temperatures below 10 K with no emissive windows between the telescope and the sky. Standard liquid helium bucket dewars can contain a suitable telescope for telescope diameter less than two meters. However, the mass of a dewar large enough to hold a 3-to-5-meter diameter telescope would exceed the balloon lift capacity. The solution is to separate the functions of cryogen storage and in-flight thermal isolation, utilizing the unique physical conditions at balloon altitudes. Conventional dewars are launched cold: the vacuum walls necessary for thermal isolation must also withstand the pressure gradient at sea level and are correspondingly thick and heavy. The pressure at 40 km is less than 0.3% of sea level: a dewar designed for use only at 40 km can use ultra thin walls to achieve significant reductions in mass. This innovation concerns new construction and operational techniques to produce a lightweight liquid helium bucket dewar. The dewar is intended for use on high-altitude balloon payloads. The mass is low enough to allow a large (3-to-5-meter) diameter dewar to fly at altitudes above 35 km on conventional scientific research balloons without exceeding the lift capability of the balloon. The lightweight dewar has thin (250- micron) stainless steel walls. The walls are too thin to support the pressure gradient at sea level: the dewar launches warm with the vacuum space vented continuously during ascent to eliminate any pressure gradient across the walls. A commercial 500-liter storage dewar maintains a reservoir of liquid helium within a minimal (hence low mass) volume. Once a 40-km altitude is reached, the valve venting the vacuum space of the bucket dewar is closed to seal the vacuum space. A vacuum pump then

  4. Percutaneous balloon dilatation for benign hepaticojejunostomy strictures

    NARCIS (Netherlands)

    Vos, P. M.; van Beek, E. J.; Smits, N. J.; Rauws, E. A.; Gouma, D. J.; Reeders, J. W.

    2000-01-01

    BACKGROUND: Percutaneous balloon dilatation of biliary tract strictures is generally accepted as a safe and inexpensive procedure. The effectiveness in selected groups of patients remains under discussion. The purpose of this study was to evaluate the results of percutaneous balloon dilatation in

  5. The data processor of the EUSO-Balloon experiment

    International Nuclear Information System (INIS)

    Scotti, V; Osteria, G

    2014-01-01

    The JEM-EUSO instrument is a wide-angle refractive telescope in near-ultraviolet wavelength region being proposed for attachment to the Japanese Experiment Module (JEM) onboard International Space Station (ISS). The main scientific goal of the mission is the study of Extreme Energy Cosmic Rays (EECR) above 5 × 10 19 eV. The instrument consists of high transmittance optical Fresnel lenses with a diameter of 2.5 m, a focal surface covered by ∼ 5000 Multi Anode Photo Multiplier Tubes of 64 pixels, front-end readout, trigger and system electronics. The EUSO-Balloon experiment is a pathfinder mission in which a telescope of smaller dimension than the one designed for the ISS will be mounted onboard a stratospheric balloon. The main objective of this pathfinder mission, planned for 2014, is to perform a full scale end-to-end test of all the key technologies and instrumentation of JEM-EUSO detectors and to prove the global detection chain. Furthermore, EUSO-Balloon will measure the atmospheric and terrestrial UV background components, in different observational modes, fundamental for the development of the simulations. Through a series of stratospheric balloon flights performed by the French Space Agency CNES, EUSO-Balloon also has the potential to detect Extensive Air Showers from above, paving the way for any future large scale, space-based EECR observatory. In this paper we will present the Data Processor (DP) of EUSO-Balloon, which is the component of the Electronics System which performs the data management and the instrument control. More in detail, the DP controls the front-end electronics, performs the 2nd level trigger filtering, tags events with arrival time and payload position through a GPS system, manages the Mass Memory for data storage, measures live and dead time of the telescope, provides signals for time synchronization of the event, performs housekeeping monitor, and handles the interface to the telemetry system. The DP has to operate at high

  6. Cryo-balloon catheter position planning using AFiT

    Science.gov (United States)

    Kleinoeder, Andreas; Brost, Alexander; Bourier, Felix; Koch, Martin; Kurzidim, Klaus; Hornegger, Joachim; Strobel, Norbert

    2012-02-01

    Atrial fibrillation (AFib) is the most common heart arrhythmia. In certain situations, it can result in life-threatening complications such as stroke and heart failure. For paroxsysmal AFib, pulmonary vein isolation (PVI) by catheter ablation is the recommended choice of treatment if drug therapy fails. During minimally invasive procedures, electrically active tissue around the pulmonary veins is destroyed by either applying heat or cryothermal energy to the tissue. The procedure is usually performed in electrophysiology labs under fluoroscopic guidance. Besides radio-frequency catheter ablation devices, so-called single-shot devices, e.g., the cryothermal balloon catheters, are receiving more and more interest in the electrophysiology (EP) community. Single-shot devices may be advantageous for certain cases, since they can simplify the creation of contiguous (gapless) lesion sets around the pulmonary vein which is needed to achieve PVI. In many cases, a 3-D (CT, MRI, or C-arm CT) image of a patient's left atrium is available. This data can then be used for planning purposes and for supporting catheter navigation during the procedure. Cryo-thermal balloon catheters are commercially available in two different sizes. We propose the Atrial Fibrillation Planning Tool (AFiT), which visualizes the segmented left atrium as well as multiple cryo-balloon catheters within a virtual reality, to find out how well cryo-balloons fit to the anatomy of a patient's left atrium. First evaluations have shown that AFiT helps physicians in two ways. First, they can better assess whether cryoballoon ablation or RF ablation is the treatment of choice at all. Second, they can select the proper-size cryo-balloon catheter with more confidence.

  7. Modification of calcium phosphate cement with poly (γ-glutamic acid) and its strontium salt for kyphoplasty application.

    Science.gov (United States)

    Gao, Chunxia; Liu, Huiling; Luo, Zong-Ping; Sajilafu; Yang, Huilin; Yang, Lei

    2017-11-01

    To meet the requirements of minimally invasive surgical treatments for osteoporotic vertebral compression fracture, various strategies have been proposed to enhance the properties of calcium phosphate cement (CPC). Here, a new strategy was developed by incorporating poly (γ-glutamic acid) (γ-PGA) and its strontium salt into the formulation of alpha tricalcium phosphate (α-TCP)-based CPC. Effects of γ-PGA on the injectability, cohesion, setting times, mechanical compressive strengths and cytocompatibility were systematically studied. Results showed that the injectability, cohesion and setting times were considerably improved by introducing γ-PGA into the CPC. Moreover, after setting for 7days, the compressive strengths increased from 14.6±1.4MPa for pure CPC to 35.3±1.7MPa for CPC with 8.9wt% γ-PGA and further to 61.2±5.4MPa for CPC with 8.9wt% γ-PGA combined with its strontium salt. In vitro osteoblast proliferation tests showed that the group of CPC modified by γ-PGA and its strontium salt had better cytocompatibility than the pure CPC group. All results suggest that optimal properties were obtained for the cement with 8.9wt% γ-PGA added to its solid phases and using strontium salt as the reactive liquid phase, making it as a promising candidate for application in kyphoplasty. Copyright © 2017 Elsevier B.V. All rights reserved.

  8. Early Cosmic Ray Research with Balloons

    Energy Technology Data Exchange (ETDEWEB)

    Walter, Michael, E-mail: michael.walter@desy.de

    2013-06-15

    The discovery of cosmic rays by Victor Hess during a balloon flight in 1912 at an altitude of 5350 m would not have been possible without the more than one hundred years development of scientific ballooning. The discovery of hot air and hydrogen balloons and their first flights in Europe is shortly described. Scientific ballooning was mainly connected with activities of meteorologists. It was also the geologist and meteorologist Franz Linke, who probably observed first indications of a penetrating radiation whose intensity seemed to increase with the altitude. Karl Bergwitz and Albert Gockel were the first physicists studying the penetrating radiation during balloon flights. The main part of the article deals with the discovery of the extraterrestrial radiation by V. Hess and the confirmation by Werner Kolhörster.

  9. Comparative study of proliferation kinetics of paramecium tetraurelia aboard a satellite and a balloon flight

    International Nuclear Information System (INIS)

    Tixador, Rene; Richoilley, Gerard; Gasset, Gilbert; Planel, Hubert

    1982-01-01

    A possible effect of cosmic rays on cell proliferation was investigated in cultures of Paramecium tetraurelia during a stratospheric balloon flight, with the techniques already used for the CYTOS experiments, performed aboard the orbital station Salyut 6. The results show that the stimulating effect of space on cell proliferation, reported in the CYTOS experiments, also occurs in the balloon flight. The respective roles of cosmic rays and weightlesness in the biological responses are discussed [fr

  10. Intragastric balloon treatment of obesity must be combined with bariatric surgery: a pilot study in Turkey.

    Science.gov (United States)

    Saruç, Murat; Böler, Deniz; Karaarslan, Mehmet; Baysal, Çağlar; Rasa, Kemal; Çakmakçi, Metin; Uras, Cihan; Tözün, Nurdan

    2010-12-01

    The treatment of morbid obesity by intragastric balloon (BioEnterics) placement is a safe and effective procedure. Cultural, social and economical factors are known to have an impact on the outcome of therapeutic interventions. This study aimed to evaluate the effect of this method on weight loss and long-term outcome following balloon removal in a cohort of Turkish patients. Twenty-five patients (11 male, 14 female) who selected BioEnterics intragastric balloon method for weight loss over surgery were included in the study. Their mean age was 35.2±13.4 and mean body mass index was 43.5±8.7 kg/m2. Patients who had any contraindication for endoscopic BioEnterics intragastric balloon placement were excluded. BioEnterics intragastric balloon was performed under deep sedation with propofol, and all patients were placed on a 1000 kcal/day diet for six months. Patients were reevaluated six months following balloon removal. Excess weight loss of greater than 25% was considered as end of treatment success. Maintenance of excess weight loss greater than 25% at the end of a six-month follow-up period was considered as long-term success. Results were reported as mean body mass index and mean %excess weight loss±SD. Statistical analysis was done using SPSS computer program. One patient was excluded from the study because of psychological intolerance (1/25) prompting early balloon removal. Twenty-four patients completed both the initial phase and the follow-up period. At the end of the initial six months, the mean body mass index was 35.7±4.6 kg/m2 and mean excess weight loss was 46.9±11.3%. Although 22 out of 24 patients (91.6%) had achieved end of treatment success, the mean body mass index was back to 41.9±7.7 kg/m2 at the end of the follow-up period. Only two patients were able to maintain excess weight loss of 25% at the completion of the study, resulting in a long-term success rate of 8.3%. BioEnterics intragastric balloon is a safe and effective but temporary

  11. Trajectory Control For High Altitude Balloons

    Science.gov (United States)

    Aaron, K.; Nock, K.; Heun, M.; Wyszkowski, C.

    We will discuss the continuing development of the StratoSailTM Balloon Trajectory Control System presented at the 33rd COSPAR in 2000. A vertical wing suspended on a 15-km tether from a high altitude balloon uses the difference in wind velocity between the altitude of the balloon and the altitude of the wing to create an aerodynamic sideforce. This sideforce, transmitted to the balloon gondola via the tether, causes the balloon to move laterally. Although the balloon's resultant drift velocity is quite small (a few meters per second), the effect becomes significant over long periods of time (hours to days). Recently, a full-scale wing, rudder and boom assembly has been fabricated, a winch system testbed has been completed, and a lightweight tether with reduced susceptibility to ultraviolet damage has been developed. The development effort for this invention, with pending international patents, has been funded by the NASA/SBIR program in support of the Ultra Long Duration Balloon (ULDB) program.

  12. 14 CFR 61.115 - Balloon rating: Limitations.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 2 2010-01-01 2010-01-01 false Balloon rating: Limitations. 61.115 Section... rating: Limitations. (a) If a person who applies for a private pilot certificate with a balloon rating... operate a gas balloon. (b) If a person who applies for a private pilot certificate with a balloon rating...

  13. Accurate Determination of the Volume of an Irregular Helium Balloon

    Science.gov (United States)

    Blumenthal, Jack; Bradvica, Rafaela; Karl, Katherine

    2013-01-01

    In a recent paper, Zable described an experiment with a near-spherical balloon filled with impure helium. Measuring the temperature and the pressure inside and outside the balloon, the lift of the balloon, and the mass of the balloon materials, he described how to use the ideal gas laws and Archimedes' principal to compute the average molecular…

  14. Abdominal cavity balloon for preventing a patient's bleeding

    NARCIS (Netherlands)

    Naber, E.E.H.; Rutten, H.J.T.; Jakimowicz, J.J.; Goossens, R.H.M.; Moes, C.C.M.; Buzink, S.N.

    2007-01-01

    The invention relates to an abdominal cavity balloon for preventing a haemorrhage in a patient's pelvic region, comprising an inflatable balloon, wherein the balloon is pro vided with a smooth surface and with a strip that is flex- urally stiff and formed to follow the balloon's shape for po

  15. Endoscopic large balloon sphincteroplasty is a useful, safe adjunct for difficult to treat choledocholithiasis.

    Science.gov (United States)

    Turner, Greg A; Ing, Andrew J; Connor, Saxon J

    2016-05-01

    The aim of this study was to assess the safety and efficacy of large balloon sphincteroplasty when used in conjunction with endoscopic biliary sphincterotomy during endoscopic retrograde cholangiopancreatography (ERCP) for therapy of choledocholithiasis. A retrospective audit of all ERCP's performed for choledocholithiasis between January 2012 and October 2013 at one institution was performed. Procedures that utilized large balloon sphincteroplasty were compared with those underwent standard endoscopic stone extraction. Outcomes including stone clearance rate for the individual procedure type, post-ERCP complications and need for surgical exploration of the bile duct were documented. A total of 346 procedures on 306 patients that met the inclusion criteria were identified. Fifty-four (15.6%) procedures included large balloon sphincteroplasty and were compared with 292 (84.4%) procedures that used standard balloon extraction techniques. Despite those patients in the large balloon sphincteroplasty group having a higher rate of previous ERCP (33.3% versus 19.5%, P = 0.031) and a larger proportion of patients with stones greater than 10 mm (40.3% versus 11.3%, P choledocholithiasis. The current study demonstrated large balloon sphincteroplasty did not result in more complications despite a tendency to being used for larger stones. © 2014 Royal Australasian College of Surgeons.

  16. Measurements of Intra‐Aortic Balloon Wall Movement During Inflation and Deflation: Effects of Angulation

    Science.gov (United States)

    Bruti, Gianpaolo; Kolyva, Christina; Pepper, John R.

    2015-01-01

    Abstract The intra‐aortic balloon pump (IABP) is a ventricular assist device that is used with a broad range of pre‐, intra‐, and postoperative patients undergoing cardiac surgery. Although the clinical efficacy of the IABP is well documented, the question of reduced efficacy when patients are nursed in the semi‐recumbent position remains outstanding. The aim of the present work is therefore to investigate the underlying mechanics responsible for the loss of IABP performance when operated at an angle to the horizontal. Simultaneous recordings of balloon wall movement, providing an estimate of its diameter (D), and fluid pressure were taken at three sites along the intra‐aortic balloon (IAB) at 0 and 45°. Flow rate, used for the calculation of displaced volume, was also recorded distal to the tip of the balloon. An in vitro experimental setup was used, featuring physiological impedances on either side of the IAB ends. IAB inflation at an angle of 45° showed that D increases at the tip of the IAB first, presenting a resistance to the flow displaced away from the tip of the balloon. The duration of inflation decreased by 15.5%, the inflation pressure pulse decreased by 9.6%, and volume decreased by 2.5%. Similarly, changing the position of the balloon from 0 to 45°, the balloon deflation became slower by 35%, deflation pressure pulse decreased by 14.7%, and volume suctioned was decreased by 15.2%. IAB wall movement showed that operating at 45° results in slower deflation compared with 0°. Slow wall movement, and changes in inflation and deflation onsets, result in a decreased volume displacement and pressure pulse generation. Operating the balloon at an angle to the horizontal, which is the preferred nursing position in intensive care units, results in reduced IAB inflation and deflation performance, possibly compromising its clinical benefits. PMID:25959284

  17. Looners: Inside the world of balloon fetishism

    OpenAIRE

    McIntyre, Karen E

    2011-01-01

    In the spring of 1997, Shaun had just broken up with a boyfriend, and his roommate had moved out. Living alone for the first time and relieved of the fear that someone might walk in the door, he was finally able to indulge his fantasy. The young man sat on his couch and started blowing up balloons. Shaun had loved playing with balloons since he was a child. When he hit puberty, he felt his first orgasm rubbing against a balloon. It was then that his relationship with the object took ...

  18. A comparative study of internally and externally capped balloons using small scale test balloons

    Science.gov (United States)

    Bell, Douglas P.

    1994-01-01

    Caps have been used to structurally reinforce scientific research balloons since the late 1950's. The scientific research balloons used by the National Aeronautics and Space Administration (NASA) use internal caps. A NASA cap placement specification does not exist since no empirical information exisits concerning cap placement. To develop a cap placement specification, NASA has completed two in-hangar inflation tests comparing the structural contributions of internal caps and external caps. The tests used small scale test balloons designed to develop the highest possible stresses within the constraints of the hangar and balloon materials. An externally capped test balloon and an internally capped test balloon were designed, built, inflated and simulated to determine the structural contributions and benefits of each. The results of the tests and simulations are presented.

  19. Star camera aspect system suitable for use in balloon experiments

    International Nuclear Information System (INIS)

    Hunter, S.D.; Baker, R.G.

    1985-01-01

    A balloon-borne experiment containing a star camera aspect system was designed, built, and flown. This system was designed to provide offset corrections to the magnetometer and inclinometer readings used to control an azimuth and elevation pointed experiment. The camera is controlled by a microprocessor, including commendable exposure and noise rejection threshold, as well as formatting the data for telemetry to the ground. As a background program, the microprocessor runs the aspect program to analyze a fraction of the pictures taken so that aspect information and offset corrections are available to the experiment in near real time. The analysis consists of pattern recognition of the star field with a star catalog in ROM memory and a least squares calculation. The performance of this system in ground based tests is described. It is part of the NASA/GSFC High Energy Gamma-Ray Balloon Instrument (2)

  20. Transjugular balloon mitral valvotomy in a patient with severe kyphoscoliosis

    Directory of Open Access Journals (Sweden)

    George Joseph

    2016-09-01

    Full Text Available Balloon mitral valvotomy (BMV performed by the conventional transfemoral approach can be difficult or even impossible in the presence of structural impediments such as severe kyphoscoliosis, gross cardiac anatomic distortion and inferior vena caval anomalies. A 25-year-old woman with severe thoracolumbar kyphoscoliosis due to poliomyelitis presented with symptomatic rheumatic mitral valve stenosis. After the failure of transfemoral BMV, the procedure was attempted from the right jugular access, using a modified septal puncture technique. The left atrium was entered from the jugular access and the mitral valve was crossed and dilated successfully using over the wire balloon technique. Transjugular BMV is an effective alternative in patients with kyphoscoliotic spine that preclude transfemoral approach. The detailed technique used for the procedure, its advantages as well as the other percutaneous treatment options are also discussed.

  1. Immediate balloon deflation for prevention of persistent phrenic nerve palsy during pulmonary vein isolation by balloon cryoablation.

    Science.gov (United States)

    Ghosh, Justin; Sepahpour, Ali; Chan, Kim H; Singarayar, Suresh; McGuire, Mark A

    2013-05-01

    Persistent phrenic nerve palsy is the most frequent complication of cryoballoon ablation for atrial fibrillation and can be disabling. To describe a technique-immediate balloon deflation (IBD)-for the prevention of persistent phrenic nerve palsy, provide data for its use, and describe in vitro simulations performed to investigate the effect of IBD on the atrium and pulmonary vein. Cryoballoon procedures for atrial fibrillation were analyzed retrospectively (n = 130). IBD was performed in patients developing phrenic nerve dysfunction (n = 22). In vitro simulations were performed by using phantoms. No adverse events occurred, and all patients recovered normal phrenic nerve function before leaving the procedure room. No patient developed persistent phrenic nerve palsy. The mean cryoablation time to onset of phrenic nerve dysfunction was 144 ± 64 seconds. Transient phrenic nerve dysfunction was seen more frequently with the 23-mm balloon than with the 28-mm balloon (11 of 39 cases vs 11 of 81 cases; P = .036). Balloon rewarming was faster following IBD. The time to return to 0 and 20° C was shorter in the IBD group (6.7 vs 8.9 seconds; P = .007 and 16.7 vs 37.6 seconds; P<.0001). In vitro simulations confirmed that IBD caused more rapid tissue warming (time to 0°C, 14.0 ± 3.4 seconds vs 46.0 ± 8.1; P = .0001) and is unlikely to damage the atrium or pulmonary vein. IBD results in more rapid tissue rewarming, causes no adverse events, and appears to prevent persistent phrenic nerve palsy. Simulations suggest that IBD is unlikely to damage the atrium or pulmonary vein. Copyright © 2013 Heart Rhythm Society. All rights reserved.

  2. Recent Developments in Balloon Support Instrumentation at TIFR Balloon Facility, Hyderabad.

    Science.gov (United States)

    Vasudevan, Rajagopalan

    2012-07-01

    The Balloon Facility of Tata Institute of Fundamental Research has been conducting stratospheric balloon flights regularly for various experiments in Space Astronomy and Atmospheric Sciences. A continuous improvement in Balloon flight Support instrumentation by the Control Instrumentation Group to keep in space with the growing complexities of the scientific payloads have contributed to the total success of balloon flights conducted recently. Recent improvements in display of Balloon position during balloon flight by showing on real time the balloon GPS position against Google TM maps is of immense help in selecting the right spot for payload landing and safe recovery . For further speeding up the payload recovery process, a new GPS-GSM payload system has been developed which gives SMS of the payload position information to the recovery team on their cell phones. On parallel footing, a new GPS- VHF system has been developed using GPS and Radio Modems for Balloon Tracking and also for obtaining the payload impact point. On the Telecommand side, a single board Telecommand/ Timer weighing less than 2 Kg has been specially developed for use in the mesosphere balloon test flight. The interference on the existing Short Range Telemetry System has been eliminated by introducing a Band Pass Filter and LNA in the Receiving system of the modules, thereby enhancing its reliability. In this paper , we present the details of the above mentioned developments.

  3. Balloon-based adjuvant radiotherapy in breast cancer: comparison between 99mTc and HDR 192Ir

    Directory of Open Access Journals (Sweden)

    Tarcísio Passos Ribeiro de Campos

    2016-04-01

    Full Text Available Abstract Objective: To perform a comparative dosimetric analysis, based on computer simulations, of temporary balloon implants with 99mTc and balloon brachytherapy with high-dose-rate (HDR 192Ir, as boosts to radiotherapy. We hypothesized that the two techniques would produce equivalent doses under pre-established conditions of activity and exposure time. Materials and Methods: Simulations of implants with 99mTc-filled and HDR 192Ir-filled balloons were performed with the Siscodes/MCNP5, modeling in voxels a magnetic resonance imaging set related to a young female. Spatial dose rate distributions were determined. In the dosimetric analysis of the protocols, the exposure time and the level of activity required were specified. Results: The 99mTc balloon presented a weighted dose rate in the tumor bed of 0.428 cGy.h-1.mCi-1 and 0.190 cGyh-1.mCi-1 at the balloon surface and at 8-10 mm from the surface, respectively, compared with 0.499 and 0.150 cGyh-1.mCi-1, respectively, for the HDR 192Ir balloon. An exposure time of 24 hours was required for the 99mTc balloon to produce a boost of 10.14 Gy with 1.0 Ci, whereas only 24 minutes with 10.0 Ci segments were required for the HDR 192Ir balloon to produce a boost of 5.14 Gy at the same reference point, or 10.28 Gy in two 24-minutes fractions. Conclusion: Temporary 99mTc balloon implantation is an attractive option for adjuvant radiotherapy in breast cancer, because of its availability, economic viability, and similar dosimetry in comparison with the use of HDR 192Ir balloon implantation, which is the current standard in clinical practice.

  4. Balloon-based adjuvant radiotherapy in breast cancer: comparison between {sup 99m}Tc and HDR {sup 192}Ir

    Energy Technology Data Exchange (ETDEWEB)

    Campos, Tarcisio Passos Ribeiro de; Lima, Carla Flavia de; Cuperschmid, Ethel Mizrahy, E-mail: tprcampos@pq.cnpq.br [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil)

    2016-03-15

    Objective: To perform a comparative dosimetric analysis, based on computer simulations, of temporary balloon implants with {sup 99m}Tc and balloon brachytherapy with high-dose-rate (HDR) {sup 192}Ir, as boosts to radiotherapy. We hypothesized that the two techniques would produce equivalent doses under pre-established conditions of activity and exposure time. Materials and methods: simulations of implants with {sup 99m}Tc-filled and HDR {sup 192}Ir-filled balloons were performed with the Siscodes/MCNP5, modeling in voxels a magnetic resonance imaging set related to a young female. Spatial dose rate distributions were determined. In the dosimetric analysis of the protocols, the exposure time and the level of activity required were specified. Results: the {sup 99m}Tc balloon presented a weighted dose rate in the tumor bed of 0.428 cGy.h{sup -1}.mCi{sup -1} and 0.190 cGyh{sup -1} at the balloon surface and at 8-10 mm from the surface, respectively, compared with 0.499 and 0.150 cGyh{sup -1}.mCi{sup -1}, respectively, for the HDR {sup 192}Ir balloon. An exposure time of 24 hours was required for the {sup 99m}Tc balloon to produce a boost of 10.14 Gy with 1.0 Ci, whereas only 24 minutes with 10.0 Ci segments were required for the HDR {sup 192}Ir balloon to produce a boost of 5.14 Gy at the same reference point, or 10.28 Gy in two 24-minutes fractions. Conclusion: temporary {sup 99m}Tc balloon implantation is an attractive option for adjuvant radiotherapy in breast cancer, because of its availability, economic viability, and similar dosimetry in comparison with the use of HDR {sup 192}Ir balloon implantation, which is the current standard in clinical practice. (author)

  5. Magnetometer for Balloons and UAVs Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This Phase I SBIR project will investigate a new, low-cost approach to atomic magnetometry that is suited for operation from UAVs and research balloons. Atomic...

  6. Solid State Inflation Balloon Active Deorbiter

    Data.gov (United States)

    National Aeronautics and Space Administration — The Solid State Inflation Balloon (SSIB) is a simple, reliable, low-cost, non-propulsive system for deliberate deorbit and control of downrange point-of-impact that...

  7. Shielded Mars Balloon Launcher (SMBL) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Aurora Flight Sciences, along with its partner Vertigo Industries, proposes a novel approach to deployment of balloon-based payloads into the Martian atmosphere....

  8. Balloon catheter versus basket catheter for endoscopic bile duct stone extraction: a multicenter randomized trial.

    Science.gov (United States)

    Ishiwatari, Hirotoshi; Kawakami, Hiroshi; Hisai, Hiroyuki; Yane, Kei; Onodera, Manabu; Eto, Kazunori; Haba, Shin; Okuda, Toshinori; Ihara, Hideyuki; Kukitsu, Takehiro; Matsumoto, Ryusuke; Kitaoka, Keisuke; Sonoda, Tomoko; Hayashi, Tsuyoshi

    2016-04-01

    Endoscopic bile duct stone (BDS) removal is a well-established treatment; however, the preference for basket or balloon catheters for extraction is operator-dependent. We therefore conducted a multicenter prospective randomized trial to compare catheter performance. We enrolled patients with a BDS diameter ≤ 10 mm and common bile duct diameter ≤ 15 mm. Participants were randomly assigned to groups that were treated with basket or balloon catheters between October 2013 and September 2014. The primary endpoint was the rate of complete clearance of the duct; the secondary endpoints were the rate and time to complete clearance in one endoscopic session. We initially enrolled 172 consecutive patients; 14 were excluded after randomization. The complete clearance rates were 92.3 % (72/78) in the balloon group and 80.0 % (64 /80) in the basket group. The difference in the rates between the two groups was 12.3 percentage points, indicating non-inferiority of the balloon method (non-inferiority limit -10 %; P < 0.001 for non-inferiority). Moreover, the balloon was superior to the basket (P = 0.037). The rate of complete clearance in one endoscopic session was 97.4 % using the balloon and 97.5 % using the basket (P = 1.00). The median times to complete clearance in one endoscopic session were 6.0 minutes (1 - 30) and 7.8 minutes (1 - 37) in the balloon and basket groups, respectively (P = 0.15). For extraction of BDSs ≤ 10 mm, complete endoscopic treatment with a single catheter is more likely when choosing a balloon catheter over a basket catheter.University Hospital Medical Information Network Trials Registry: UMIN000011887. © Georg Thieme Verlag KG Stuttgart · New York.

  9. Intraluminal pressure of uterine balloon tamponade in the management of severe post-partum hemorrhage.

    Science.gov (United States)

    Kong, Choi Wah; To, William W K

    2018-02-01

    Intrauterine balloon tamponade has been increasingly used for the management of post-partum hemorrhage (PPH) in recent years. However, data on the precise mechanisms and pressure required for the balloon tamponade are scanty in the literature. This study aims to review the intraluminal pressure (ILP) generated by the Bakri intrauterine balloon that is necessary to produce a 'positive tamponade test' during severe PPH. This was a prospective cohort study. The ILP of the Bakri balloon was measured using a manometer after a positive tamponade test was clinically achieved during severe PPH (blood loss >1 L). The patient's blood pressure was recorded, and ultrasound scan was performed to verify the position of the balloon and the presence of forward flow in the uterine arteries. The main outcome measure is the ILP of the Bakri balloon required to achieve a positive tamponade test. Twenty patients were included for final analysis. The net ILP measured ranged from 67 to 92 mmHg, and this pressure was lower than the concurrent systolic pressure in all cases. Color Doppler confirmed positive forward flow in the uterine vessels in all cases. There were no differences in the pressure measured with the balloon position, and there was no relationship between the volumes of saline infused and the net pressure. A positive tamponade test in an intrauterine balloon is probably achieved by local compression pressure exerted on the vasculature of the placental bed rather than by generating an ILP exceeding systemic blood pressure or by occlusion of flow to the uterine arteries. © 2018 Japan Society of Obstetrics and Gynecology.

  10. [Biomechanical effect on adjacent vertebra after percutaneous kyphoplasty with cement leakage into disc: a finite element analysis of thoracolumbar osteoporotic vertebral compression fracture].

    Science.gov (United States)

    Fei, Qi; Li, Qiu-Jun; Li, Dong; Yang, Yong; Tang, Hai; Li, Jin-Jun; Wang, Bing-Qiang; Wang, Yi-Peng

    2011-01-04

    To explore the biomechanical effects on adjacent vertebra of thoracolumbar osteoporotic vertebral compression fracture (OVCF) after percutaneous kyphoplasty (PKP) with cement leakage into the disc by using finite element analysis. T10-L2 segment data were obtained from computed tomography (CT) scans of an elder female with single T12 OVCF undergoing a cement leakage into the T12-L1 disc after PKP. A three-dimensional finite element Model of thoracolumbar spine (T10-L2) was built in the Mimics and the ABAQUS software. The stress on annulus fiber, nucleus pulposus, endplate and facet joints under axial pressure (0.3, 1.0, 4.0 MPa) were analyzed. The 3D finite element after percutaneous kyphoplasty (PKP) with cement leakage into the disc may be strongly related with the changes of biomechanical effects on adjacent vertebra of thoracolumbar OVCF. Models of thoracolumbar OVCF before and after PVP with a cement leakage into the T12-L1 disc were successfully established. The stresses increased with a rising axial pressure in the model of cement leakage into the disc after PVP, the stress augmentation scope on adjacent end plates(T11 low plate & L1 top plate) and intervertebral disc (T11-12 & T12-L1) increased. The maximal Von Mises stress on adjacent vertebra (T11 & L1) increased while but the maximal Von Mises stress on end vertebra (T10 & L2) decreased. Postoperative adjacent vertebral fracture.

  11. Significant skin burns may occur with the use of a water balloon in HIFU treatment

    Science.gov (United States)

    Ritchie, Robert; Collin, Jamie; Wu, Feng; Coussios, Constantin; Leslie, Tom; Cranston, David

    2012-10-01

    HIFU is a minimally-invasive therapy suitable for treating selected intra-abdominal tumors. Treatment is safe although skin burns may occur due to pre-focal heating. HIFU treatment of a renal transplant tumor located in the left lower abdomen was undertaken in our centre. Treatment was performed prone, requiring displacement of the abdominal wall away from the treatment field using a water balloon, constructed of natural rubber latex and filled with degassed water. Intra-operatively, ultrasound imaging and physical examination of the skin directly over the focal region was normal. Immediately post-operative, a full-thickness skin burn was evident at the periphery of the balloon location, outside the expected HIFU path. Three possibilities may account for this complication. Firstly, the water balloon may have acted as a lens, focusing the HIFU to a neo-focus off axis. Secondly, air bubbles may have been entrapped between the balloon and the skin, causing heating at the interface. Finally, heating of the isolated water within the balloon may have been sufficient to cause burning. In this case, the placement of a water balloon caused a significant skin burn. Care should be taken in their use as burns, situated off axis, may occur even if the overlying skin appears normal.

  12. Predictors of cardiogenic shock in cardiac surgery patients receiving intra-aortic balloon pumps.

    Science.gov (United States)

    Iyengar, Amit; Kwon, Oh Jin; Bailey, Katherine L; Ashfaq, Adeel; Abdelkarim, Ayman; Shemin, Richard J; Benharash, Peyman

    2018-02-01

    Cardiogenic shock after cardiac surgery leads to severely increased mortality. Intra-aortic balloon pumps may be used during the preoperative period to increase coronary perfusion. The purpose of this study was to characterize predictors of postoperative cardiogenic shock in cardiac surgery patients with and without intra-aortic balloon pumps support. We performed a retrospective analysis of our institutional database of the Society of Thoracic Surgeons for patients operated between January 2008 to July 2015. Multivariable logistic regression was used to model postoperative cardiogenic shock in both the intra-aortic balloon pumps and matched control cohorts. Overall, 4,741 cardiac surgery patients were identified during the study period, of whom 192 (4%) received a preoperative intra-aortic balloon pump. Intra-aortic balloon pumps patients had a greater prevalence of diabetes, previous cardiac surgery, congestive heart failure, and an urgent/emergent status (P pumps patients also had greater 30-day mortality and more postoperative cardiogenic shock (9% vs 3%, P pumps cohort, only sex, previous percutaneous coronary intervention and preoperative arrhythmia remained significant on multivariable analysis (all P pumps and those who do not. Further analysis of the effects of prophylactic intra-aortic balloon pumps support is warranted. (Surgery 2017;160:XXX-XXX.). Copyright © 2017 Elsevier Inc. All rights reserved.

  13. Test ventilation with smoke, bubbles, and balloons

    International Nuclear Information System (INIS)

    Pickering, P.L.; Cucchiara, A.L.; McAtee, J.L.; Gonzales, M.

    1987-01-01

    The behavior of smoke, bubbles, and helium-filled balloons was videotaped to demonstrate the mixing of air in the plutonium chemistry laboratories, a plutonium facility. The air-distribution patterns, as indicated by each method, were compared. Helium-filled balloons proved more useful than bubbles or smoke in the visualization of airflow patterns. The replay of various segments of the videotape proved useful in evaluating the different techniques and in identifying airflow trends responsible for air mixing. 6 refs

  14. Significance of balloon pressure recording during angioplasty

    Energy Technology Data Exchange (ETDEWEB)

    Zollikofer, C.L.; Salomonowitz, E.; Frick, M.P.; Castaneda-Zuniga, W.R.; Amplatz, K.; Bruehlmann, W.F.

    1985-05-01

    During angioplasty of artificial stenoses, atherosclerotic human cadaver arteries, and normal canine arteries, pressure and volume of the dilatation balloons were continuously recorded. We found that a sudden yield of a lesion corresponded to a sudden drop in the pressure curve and an increase of the balloon volume. Volume monitoring was insensitive, but pressure recording was very precise. Continuous pressure recording, using a non-compliant inflation system, correctly demonstrated small breaks and ruptures of atherosclerotic vessels, changes not seen on fluoroscopy.

  15. First-in-human experience using the Volcano VIBE-RX vascular imaging balloon catheter system (Volcano IVUS-guided Balloon Evaluation - New Zealand: VIBE-NZ Study).

    Science.gov (United States)

    Watson, Timothy; El-Jack, Seifeddin; Stewart, James T; Ormiston, John

    2013-09-01

    Intravascular ultrasound (IVUS) is a proven and safe imaging modality used to guide percutaneous coronary intervention (PCI). The Volcano VIBE™ RX Vascular Imaging Balloon Catheter is a novel rapid exchange, 0.014" wire-compatible multi-lumen conventional balloon catheter modified with the addition of an IVUS transducer proximal to the balloon, delivered via a standard 6 Fr sheath. We sought to evaluate the safety, balloon performance, and image quality of the VIBE™ RX in patients scheduled for coronary intervention. Patients aged >21 and <85 years with single or multivessel coronary disease scheduled for PCI due to coronary ischaemic symptoms were included. Those with angiographic features that precluded the safe or informative use of the device were excluded. Twenty-nine patients having angiography because of ischaemic symptoms underwent 44 VIBE RX imaging runs, with balloon dilation in 20. Successful device deployment was achieved in all but one patient. All images were adequate and reproducible. One patient had a non-ST-elevation MI felt to be due to the complexity of the procedure rather than directly related to the VIBE™ RX. The study demonstrated the safety and effectiveness of the VIBE™ RX for its intended purpose with minimal failure rate and no directly related complications.

  16. Balloon catheter dilatation of benign urethral strictures

    International Nuclear Information System (INIS)

    Perini, L.; Cavallo, A.; Perin, B.; Bighi, G.

    1988-01-01

    The authors report their experience of benign urethral stricture dilatation by balloon catheter in 11 male patients. Ten posterior and 2 anterior urethral strictures were treated; in 1 patients several narrowings coexisted at various levels. Etiology was inflammatory in 4 cases, iatrogen in 3, post-traumatic in 2, and equivocal in 2. The patients were studied both before and soon after dilatation by means of retrograde and voiding cystourethrogram and uroflowgraphy; the follow-up (2-14 months) was performed by urodynamic alone. In all cases, dilatation was followed by the restoration of urethral gauge, together with prompt functional improvement of urodynamic parameters. The latter result subsisted in time in 9 patients. In 2 cases recurrences were observed demonstrated at once by clinics and urodynamics. Both lesions were successfully re-treated. Neither early not late complication occurred. In spite of the limited material, the valuable results obtained, together with the absence of complications, the peculiar morphology of recurrences, and the chance of repeating it make the procedure advisable as a valid alternative to conventional techniques for these pathologies

  17. Retrograde prostatic urethroplasty with a balloon catheter

    International Nuclear Information System (INIS)

    Castaneda, F.; Reddy, P.; Hulbert, J.; Letourneau, J.G.; Hunter, D.W.; Castaneda-Zuniga, W.R.; Amplatz, K.

    1987-01-01

    Twenty-five patients with prostatism and documented BPH who were candidates for transurethral resection of the prostate were dilated for 10 minutes with 25-mm urethroplasty balloons using a retrograde transurethral approach. The procedure was performed under local anesthesia using 2% viscous lidocaine on an outpatient basis. A mild discomfort was experienced by all patients with a moderate urgency sensation. Mild transient hematuria was present in all, which cleared in 4 to 6 hours. Dysuria usually lasted for 72 hours. Significant improvement has been seen in the relief of symptoms in patients without middle-lobe hypertrophy as documented by uroflow studies, voiding cystourethrograms, and retrograde urethrograms. In patients with middle-lobe hypertrophy, moderate improvement in uroflow studies was observed, which correlated well with symptomatic improvement. Rectal US and MR studies have shown no evidence of intraprostatic or periprostatic abnormalities. No complications have been encountered so far. The longest current follow-up is 20 months, with a mean of 10 months

  18. Percutaneous balloon valvuloplasty in mitral stenosis

    International Nuclear Information System (INIS)

    Park, Jae Hyung; Oh, Byung Hee; Park, Kyung Ju; Kim, Seung Hyup; Lee, Young Woo; Han, Man Chung

    1989-01-01

    Percutaneous balloon valvuloplasty(PBV) was successfully performed in 8 mitral stenosis patients for recent 3 months. Five patients have aortic insufficiencies also and two patients have mitral regurgitations below grade II/IV. All patients showed sinus rhythm on EKG, and had no mitral valvular calcification on echocardiography and fluoroscopy. PBV resulted in an increase in mitral valve area from 1.22±0.22 to 2.57±0.86 cm 2 , a decrease in mean left atrial pressure from 23.4±9.6 to 7.5±3.4 mmHg and a decrease in mean mitral pressure gradient from 21.3±9.4 to 6.8±3.1 mmHg. There were no significant complications except 2 cases of newly appeared and mildly aggravated mitral regurgitation. We believe that PBV will become a treatment modality of choice replacing surgical commissurotomy or valve replacement in a group of mitral stenosis patients, because of its effectiveness and safety

  19. Application of new balloon catheters in the treatment of congenital heart defects

    Directory of Open Access Journals (Sweden)

    Roland Fiszer

    2016-08-01

    Full Text Available Introduction : Balloon angioplasty (BAP and aortic or pulmonary balloon valvuloplasty (BAV, BPV are well-established treatment options in congenital heart defects. Recently, significant technological progress has been made and new catheters have been implemented in clinical practice. Aim: To analyze the results of BAP, BAV and BPV with the new balloon catheter Valver and its second generation Valver II, which the company Balton (Poland launched and developed. These catheters have not been clinically evaluated yet. Material and methods: We performed 64 interventions with Valver I and Valver II. With Valver I the following procedures were performed: 17 BPV (including 9 in tetralogy of Fallot – TOF, 10 BAV and 27 BAP in coarctations of the aorta (CoA – including 9 native and 18 after surgery. With Valver II ten interventions were done – 3 BPV, 2 pulmonary supravalvular BAP (after switch operations, 2 BAP of recoarctations and 3 other BAP. Age of the patients ranged from a few days to 40 years. Results: All procedures were completed successfully, without rupture of any balloon catheters. The pressure gradient drop was statistically significant in all groups: BPV in isolated pulmonary valvular stenosis 28.1 mm Hg (mean, BPV in TOF 18.7 mm Hg, BAV 32.8 mm Hg, BAP in native CoA 15.4 mm Hg and in recoarctations 18.6 mm Hg. In 3 cases during rapid deflation of Valver I, wrinkles of the balloons made it impossible to insert the whole balloon into the vascular sheath (all were removed surgically from the groin. No such complication occured with Valver II. Conclusions : Valver balloon catheters are an effective treatment modality in different valvular and vascular stenoses.

  20. Efficacy of balloon temporary occlusion and intraoperative DSA in surgically difficult aneurysm

    Energy Technology Data Exchange (ETDEWEB)

    Ezura, Masayuki; Mizoi, Kazuo; Yoshimoto, Takashi (Tohoku Univ., Sendai (Japan). Inst. of Brain Diseases); Takahashi, Akira

    1993-11-01

    A digital subtraction angiographic (DSA) apparatus has been installed in one of our operating rooms since April 1987. We performed intraoperative DSA in 42 aneurysmal surgeries in 38 patients and balloon temporary occlusion in 33 surgeries. The aneurysm was on an internal carotid artery in 26 cases and on the vertebro-basilar system in 16. A heparin-coated catheter (Anthron, Toray, Tokyo), 6 french in diameter, was inserted transfemorally and was put in a parent artery under general anesthesia. A balloon was temporarily inflated to determine inflation volume. The balloon catheter was soon deflated and was drawn back into the introducing catheter to avoid developing microembolus. The patients were not systemically heparinized but the introducing catheters were slowly flushed with heparinized saline during operation. Then a craniotomy was carried out. Next DSA was performed when temporary occlusion or confirmation of clipping was necessary. In cases of balloon temporary occlusion, the operating field was not obstructed as it is when a temporary clip is used, despite adequate flow reduction of the parent artery. After DSA for confirmation of clipping adjustment of it was performed in 12 cases out of 42. No complications occurred due to use of an introducing or a balloon catheter. We conclude that combined intravascular and neurosurgical approach, particularly for the large aneurysms with the difficulty of proximal control, can be a useful method of treatment. (author).

  1. Efficacy of balloon temporary occlusion and intraoperative DSA in surgically difficult aneurysm

    International Nuclear Information System (INIS)

    Ezura, Masayuki; Mizoi, Kazuo; Yoshimoto, Takashi; Takahashi, Akira.

    1993-01-01

    A digital subtraction angiographic (DSA) apparatus has been installed in one of our operating rooms since April 1987. We performed intraoperative DSA in 42 aneurysmal surgeries in 38 patients and balloon temporary occlusion in 33 surgeries. The aneurysm was on an internal carotid artery in 26 cases and on the vertebro-basilar system in 16. A heparin-coated catheter (Anthron, Toray, Tokyo), 6 french in diameter, was inserted transfemorally and was put in a parent artery under general anesthesia. A balloon was temporarily inflated to determine inflation volume. The balloon catheter was soon deflated and was drawn back into the introducing catheter to avoid developing microembolus. The patients were not systemically heparinized but the introducing catheters were slowly flushed with heparinized saline during operation. Then a craniotomy was carried out. Next DSA was performed when temporary occlusion or confirmation of clipping was necessary. In cases of balloon temporary occlusion, the operating field was not obstructed as it is when a temporary clip is used, despite adequate flow reduction of the parent artery. After DSA for confirmation of clipping adjustment of it was performed in 12 cases out of 42. No complications occurred due to use of an introducing or a balloon catheter. We conclude that combined intravascular and neurosurgical approach, particularly for the large aneurysms with the difficulty of proximal control, can be a useful method of treatment. (author)

  2. [Correlative factor analysis of complications resulting from cement leakage after percutaneous kyphoplasty in treatment of osteoporotic vertebral body compression].

    Science.gov (United States)

    Shen, Yong; Ren, Hu; Zhang, Yingze; Zhi, Xinli; Ding, Wenyuan; Xu, Jiaxin; Yang, Dalong

    2010-01-01

    To explore the correlative factors affecting the complications resulting from cement leakage after percutaneous kyphoplasty (PKP) in the treatment of osteoporotic vertebral body compression fractures (OVCF). From February 2005 to October 2008, 71 patients with OVCF were treated by PKP and were retrospectively analyzed. There were 16 males and 55 females, and the average age was 71.5 years (range, 52-91 years). The average duration of disease was 5.7 months (range, 1-11 months). A total of 171 vertebra were involved in fracture including 19 cases of single vertebral fractures, 21 cases of double vertebral fractures, 20 cases of three vertebral fractures, and 11 cases of more than three vertebral fractures. All the treated vertebra were divided into acute (86 vertebra) or subacute (85 vertebra) state based on changes in MRI signal intensity. There was no radiculopathy or myelopathy. The average injected cement volume was 4.6 mL (range, 1.5-6.5 mL). The treatment efficacy was assessed by observing the change in anterior and middle vertebral column height, Cobb angle, visual analogue scale (VAS) and Oswestry functional score at preoperation, 3 days after operation and last follow-up. The patients were divided into cement leakage group and no cement leakage group. All the complications were recorded, and then the correlative factors affecting the complications were analyzed. All the cases had rapid and significant improvement in back pain following PKP. All patients were followed up for 14 months (range, 7-18 months). There was no cement extravasation resulting in radiculopathy or myelopathy. Four patients (5.63%) had lung-related complications. During the follow-up, 9 recurrence vertebral fractures were observed in 6 patients (8.45%). The anterior and middle vertebral column height, Cobb angle, VAS and Oswestry score were significantly improved when compared with preoperation (P 0.05) in preoperative Cobb angle, freshness of vertebral fracture, location of operative

  3. Balloon Dilatation of Pediatric Subglottic Laryngeal Stenosis during the Artificial Apneic Pause: Experience in 5 Children

    Directory of Open Access Journals (Sweden)

    J. Lisý

    2014-01-01

    Full Text Available Introduction. Balloon dilatation is a method of choice for treatment of laryngeal stenosis in children. The aim of procedure in apneic pause is to avoid new insertion of tracheostomy cannula. Patients and Methods. The authors performed balloon dilatation of subglottic laryngeal strictures (SGS in 5 children (3 girls and 2 boys without tracheotomy. Two of them with traumatic and inflammatory SGS had a tracheal cannula removed in the past. The other 3 children with postintubation SGS had never had a tracheostomy before. The need for tracheostomy due to worsening stridor was imminent for all of them. Results. The total of seven laryngeal dilatations by balloon esophagoplasty catheter in apneic pause was performed in the 5 children. The procedure averted the need for tracheostomy placement in 4 of them (80%. Failure of dilatation in girl with traumatic stenosis and concomitant severe obstructive lung disease led to repeated tracheostomy. Conclusion. Balloon dilatation of laryngeal stricture could be done in the absence of tracheostomy in apneic pause. Dilatation averted threatening tracheostomy in all except one case. Early complication after the procedure seems to be a negative prognostic factor for the outcome of balloon dilatation.

  4. Advanced Onboard Energy Storage Solution for Balloons, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — Advanced Balloon Programs at NASA are looking for a potential 100 day missions at mid-altitudes. These balloons would be powered by solar panels to take advantage of...

  5. Crash in Australian outback ends NASA ballooning season

    Science.gov (United States)

    Harris, Margaret

    2010-06-01

    NASA has temporarily suspended all its scientific balloon launches after the balloon-borne Nuclear Compton Tele scope (NCT) crashed during take-off, scattering a trail of debris across the remote launch site and overturning a nearby parked car.

  6. Spectrum of ballooning instabilities in a stellarator

    International Nuclear Information System (INIS)

    Cooper, W.A.; Singleton, D.B.; Dewar, R.L.

    1995-08-01

    The recent revival of interest in the application of the 'ballooning formalism' to low-frequency plasma instabilities has prompted a comparison of the Wentzel-Brillouin-Kramers (WKB) ballooning approximation with an (in principle) exact normal mode calculation for a three-dimensional plasma equilibrium. Semiclassical quantization, using the ideal magnetohydrodynamic (MHD) ballooning eigenvalue to provide a local dispersion relation, is applied to a ten-field period stellarator test case. Excellent qualitative agreement, and good quantitative agreement is found with predictions from the TERPSICHORE code for toroidal mode numbers from 1 to 14 and radial mode numbers from 0 to 2. The continuum bands predicted from three-dimensional WKB theory are too narrow to resolve. (author) 3 figs., 24 refs

  7. [Intraaortic balloon pumping( IABP) in Japan].

    Science.gov (United States)

    Ono, Tomoyuki; Tanoue, Yoshihisa; Tominaga, Ryuji

    2014-07-01

    The intraaortic balloon pumping (IABP) is the most widely used circulatory assist device. IABP increases coronary perfusion in diastolic phase by the inflation of the balloon in the descending aorta (diastolic augmentation) and reduces afterload in systolic phase by the deflation of the balloon( systolic unloading). IABP improves the hemodynamic condition of patients who fall into acute heart failure and/or cardiogenic shock. Six-type IABP system can be used in Japan. The IABP-SHOCK II trial shows that there is no significant difference in mortality between optimal medical treatment with IABP and without IABP in addition to early revascularization. Clinical backgrounds in Japan are different from those in IABP-SHOCK II trial, and the further prospective studies of IABP in Japan thus called for.

  8. Neurovascular in-stent stenoses: treatment with conventional and drug-eluting balloons.

    Science.gov (United States)

    Vajda, Z; Güthe, T; Perez, M Aguilar; Heuschmid, A; Schmid, E; Bäzner, H; Henkes, H

    2011-01-01

    ISRs remain a major issue in the endovascular management of ICAD, requiring retreatment by reangioplasty. The aim of the present study was to evaluate the technical feasibility, safety, and efficiency of the novel DEBs for neurovascular ISRs. Fifty-one patients (median age, 67 years; age range, 34-82 years; male/female ratio, 37:14) underwent 63 balloon dilation procedures for ISRs in intracranial stented arterial segments between November 2007 and August 2010 in a single center. Of the 63 procedures, 20 (32%) were performed by using a conventional balloon and 43 (68%), by using a paclitaxel-eluting balloon (SeQuent Please). Angiographic and clinical follow-up was performed at 6 and 12 weeks, 6 and 12 months, and yearly thereafter. Technical success rate, periprocedural complications, occurrence of recurrent ischemic symptoms, and the development of a recurrent ISR after reangioplasty were analyzed. Technical success, defined as ISRs with DEBs are encouraging; further technical developments are, nevertheless, mandatory.

  9. A 3D CZT hard x-ray polarimeter for a balloon-borne payload

    DEFF Research Database (Denmark)

    Caroli, E.; Alvarez, J. M.; Auricchio, N.

    2012-01-01

    be optimized also for this type of measurement. In this framework, we present the concept of a small high-performance spectrometer designed for polarimetry between 100 and 1000 keV suitable as a stratospheric balloon-borne payload dedicated to perform an accurate and reliable measurement of the polarization...

  10. Planetary Balloon-Based Science Platform Evaluation and Program Implementation

    Science.gov (United States)

    Dankanich, John W.; Kremic, Tibor; Hibbitts, Karl; Young, Eliot F.; Landis, Rob

    2016-01-01

    gondola characteristics are assessed in this study and a concept is recommended, the Gondola for High-Altitude Planetary Science (GHAPS). This first generation platform is designed around a 1 m or larger aperture, narrow-field telescope with pointing accuracies better than one arc-second. A classical Cassegrain, or variant like Ritchey-Chretien, telescope is recommended for the primary telescope. The gondola should be designed for multiple flights so it must be robust and readily processed at recovery. It must be light-weighted to the extent possible to allow for long-duration flights on super-pressure balloons. Demonstration Flights: Recent demonstration flights achieved several significant accomplishments that can feed forward to a GHAPS gondola project. Science results included the first ever Earth-based measurements for CO2 in a comet, first measurements for CO2 and H2O in an Oort cloud comet, and the first measurement of 1 Ceres at 2.73 m to refine the shape of the infrared water absorption feature. The performance of the Fine Steering Mirror (FSM) was also demonstrated. The BOPPS platform can continue to be leveraged on future flights even as GHAPS is being developed. The study affirms the planetary decadal recommendations, and shows that a number of Top Priority science questions can be achieved. A combination GHAPS and BOPPS would provide the best value for PSD for realizing that science.

  11. Exponential Growth of Nonlinear Ballooning Instability

    International Nuclear Information System (INIS)

    Zhu, P.; Hegna, C. C.; Sovinec, C. R.

    2009-01-01

    Recent ideal magnetohydrodynamic (MHD) theory predicts that a perturbation evolving from a linear ballooning instability will continue to grow exponentially in the intermediate nonlinear phase at the same linear growth rate. This prediction is confirmed in ideal MHD simulations. When the Lagrangian compression, a measure of the ballooning nonlinearity, becomes of the order of unity, the intermediate nonlinear phase is entered, during which the maximum plasma displacement amplitude as well as the total kinetic energy continues to grow exponentially at the rate of the corresponding linear phase.

  12. How to Prevent Leaving 'Needle Cast' or 'Cement Tail' in Vertebroplasty and Kyphoplasty

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Hui Lin; Sun, Zhi Yong; Zhang, Hong Tao; Zhu, Xiao Yu; Chen, Kang Wu; Qian, Zhong Lai [Dept. of Orthopaedic Surgery, The First Affiliated Hospital of Soochow University, Jiangs (China)

    2012-09-15

    Nowadays, percutaneous vertebroplasty, or its evolution kyphoplasty, is a valid therapeutic option for the management of severe back pain, caused by vertebral compression fractures (1). They are minimally invasive, radiologically guided interventional procedures, which involve the injection of polymethylmethacrylate (PMMA) into the fractured vertebral body. The injection process was monitored continuously, under a fluoroscopic control in the lateral plane (2). Ideally, the injection should be completed in 5 to 6 minutes and before the PMMA becomes too viscous to allow reinsertion of the stylus. This is not always possible, but is preferred to avoid the risk of leaving a 'needle castor a 'cement tail', within the soft tissues, as the needle is removed with the adherent cement (Fig. 1). In the event that the reinsertion cannot be achieved, great care should be taken to dislodge the adherent PMMA cement before extracting the needle from the vertebral body (3).

  13. Rectal and bladder dose reduction with the addition of intravaginal balloons to vaginal packing in intracavitary brachytherapy for cervical cancer.

    Science.gov (United States)

    Eng, T Y; Patel, A J; Ha, C S

    2016-01-01

    The use of intravaginal Foley balloons in addition to conventional packing during high-dose-rate (HDR) tandem and ovoids intracavitary brachytherapy (ICBT) is a means to improve displacement of organs at risk, thus reducing dose-dependent complications. The goal of this project was to determine the reduction in dose achieved to the bladder and rectum with intravaginal Foley balloons with CT-based planning and to share our packing technique. One hundred and six HDR-ICBT procedures performed for 38 patients were analyzed for this report. An uninflated Foley balloon was inserted into the vagina above and below the tandem flange separately and secured in place with vaginal packing. CT images were then obtained with both inflated and deflated Foley balloons. Plan optimization occurred and dose volume histogram data were generated for the bladder and rectum. Maximum dose to 0.1, 1.0, and 2.0 cm(3) volumes for the rectum and bladder were analyzed and compared between inflated and deflated balloons using parametric statistical analysis. Inflation of intravaginal balloons allowed significant reduction of dose to the bladder and rectum. Amount of reduction was dependent on the anatomy of the patient and the placement of the balloons. Displacement of the organs at risk by the balloons allowed an average of 7.2% reduction in dose to the bladder (D0.1 cm(3)) and 9.3% to the rectum (D0.1 cm(3)) with a maximum reduction of 41% and 43%, respectively. For patients undergoing HDR-ICBT, a significant dose reduction to the bladder and rectum could be achieved with further displacement of these structures using intravaginal Foley balloons in addition to conventional vaginal packing. Copyright © 2016 American Brachytherapy Society. Published by Elsevier Inc. All rights reserved.

  14. Ballooning behavior in the golden orbweb spider Nephilapilipes (Araneae: Nephilidae

    Directory of Open Access Journals (Sweden)

    Vanessa M.J. Lee

    2015-01-01

    Full Text Available Ballooning, a mode of aerial dispersal in spiders, is an innate behavior that requires appropriate physiological and meteorological conditions. Although only rarely reported in the golden orbweb spiders, family Nephilidae, the large geographic distributions of most nephilids—in particular of Nephila species—would imply that these spiders likely routinely disperse by ballooning in spite of giant female sizes. Here we study ballooning behavior in the golden orbweb spider Nephila pilipes (Fabricius, 1793. Specifically, we test for the propensity of spiderlings to deploy ballooning as a dispersal mechanism. We subjected a total of 59 first-instar spiderlings to a wind experiment at two wind speeds (2.17 ± 0.02 m s-1 and 3.17 ± 0.02 m s-1 under laboratory conditions. Under an average wind speed of 3.17 m s-1, none of the spiderlings exhibited pre-ballooning or ballooning behavior. However, at an average wind speed of 2.17 m s-1, 53 (89.8% spiderlings showed pre-ballooning behavior, and 17 (32.1% of the pre-ballooners ultimately ballooned. Our results concur with prior reports on spiderlings of other families that pre-ballooning behavior is a requirement for ballooning to occur. Furthermore, although we cannot rule out other dispersal mechanisms such as synanthropic spread, our findings suggest that the widespread N. pilipes uses ballooning to colonize remote oceanic islands.

  15. Outcomes of intragastric balloon placements in a private practice setting

    NARCIS (Netherlands)

    Mathus-Vliegen, Elisabeth M. H.; Alders, Peter R. H.; Chuttani, Ram; Scherpenisse, Joost

    2015-01-01

    Intragastric balloons are used as a treatment for obesity. Much of the data collected on balloons has been in the context of clinical trials in academic medical centers or as a bridge to bariatric surgery in obesity centers. The aim of this study was to investigate the efficacy and safety of balloon

  16. 21 CFR 884.5050 - Metreurynter-balloon abortion system.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Metreurynter-balloon abortion system. 884.5050... Devices § 884.5050 Metreurynter-balloon abortion system. (a) Identification. A metreurynter-balloon abortion system is a device used to induce abortion. The device is inserted into the uterine cavity...

  17. Cineangiographic findings and balloon catheter angioplasty of pulmonic valvular stenosis

    Energy Technology Data Exchange (ETDEWEB)

    Yeon, Kyung Mo; Yoon, Yong Soo; Kim, In One; Han, Man Chung [College of Medicine, Seoul National University, Seoul (Korea, Republic of)

    1987-08-15

    Transluminal balloon valvuloplasty was performed in the treatment of congenital pulmonic valvular stenosis in 55 children, aged 4 months to 15 years. The right ventricular outflow tract pressure gradient decreased significantly immediately after the procedure from 87.18 {+-} 56mmHg to 29.62 {+-} 26.48mmHg ({rho} < 0.001). Technical success rate was 98% (54/55 patients) and failed case (1 patient) was due to severe fibrous thickening of valve. Complication occurred in one case, that is tricuspid regurgitation (Grade II) due to suspected rupture of chordae tendinae. The degree of pulmonary conus dilatation was closely related with age than the pressure gradient.

  18. Reduction of the domino effect in osteoporotic vertebral compression fractures through short-segment fixation with intravertebral expandable pillars compared to percutaneous kyphoplasty: a case control study.

    Science.gov (United States)

    Hsieh, Jui-Yang; Wu, Chung-Ding; Wang, Ting-Ming; Chen, Hsuan-Yu; Farn, Chui-Jia; Chen, Po-Quang

    2013-03-02

    Osteoporotic vertebral compression fracture is the leading cause of disability and morbidity in elderly people. Treatment of this condition remains a challenge. Osteoporotic vertebral compression fractures can be managed with various approaches, but each has limitations. In this study, we compared the clinical outcomes obtained using short-segment fixation with intravertebral expandable pillars (I-VEP) to those obtained with percutaneous kyphoplasty in patients who had suffered vertebral compression fractures. The study included 46 patients with single-level osteoporotic thoracolumbar fractures. Twenty-two patients in Group I underwent short-segment fixation with I-VEP and 24 patients in Group II underwent kyphoplasty. All patients were evaluated pre- and postoperatively using a visual analogue scale, anterior height of the fractured vertebra, and kyphotic angle of the fractured vertebra. The latter 2 radiological parameters were measured at the adjacent segments as well. There was no significant difference between the groups in terms of gender or fracture level, but the mean age was greater in Group II patients (p = 0.008). At the 1-year follow-up, there were no significant differences in the visual analogue scale scores, anterior height of the fractured vertebra, or the value representing anterior height above the fractured vertebra and kyphotic angle below the fractured vertebra, after adjusting for the patients' gender, fracture level, and age. When considered separately, the anterior height below the fractured vertebra was significantly higher and the kyphotic angle above the fractured vertebra was significantly smaller in Group I than in Group II (p = 0.029 and p = 0.008, respectively). The kyphotic angle of the fractured vertebra was significantly smaller in Group II than in Group I (p osteoporotic kyphotic spines.

  19. Overview Of The Scientific Balloon Activity in Sweden 2014-2016

    Science.gov (United States)

    Abrahamsson, Mattias; Lockowandt, Christian; Andersson, Kent

    2016-07-01

    SSC, formerly known as Swedish Space Corporation, is a Swedish state-owned company working in several different space related fields, including scientific stratospheric balloon launches. Esrange Space Centre (Esrange in short) located in the north of Sweden is the launch facility of SSC, where both sounding rocket launches and stratospheric balloon launches are conducted. At Esrange there are also facilities for satellite communication, including one of the largest civilian satellite data reception stations in the world. Stratospheric balloons have been launched from Esrange since 1974, when the first flights were performed together with the French space agency CNES. These balloon flights have normally flown eastward either only over Sweden or into Finland. Some flights have also had permission to fly into Russia, as far as the Ural Mountains. Normal flight times are from 4 to 12 hours. These eastward flights are conducted during the winter months (September to May). Long duration flights have been flown from Esrange since 2005, when NASA flew the BLAST payload from Sweden to north Canada. The prevailing westerly wind pattern is very advantageous for trans-Atlantic flights during summer (late May to late July). The long flight times of 4-5 days are very beneficial for astronomical payloads, such as telescopes that need long observation times. Circumpolar flights of more than two weeks are possible if Russian overflight permission exists. Typical scientific balloon payload fields include atmospheric research, including research on ozone depletion, astronomical and cosmological research, and research in technical fields such as aerodynamics. Since last COSPAR a number of interesting balloon flights have been performed from Esrange. In late 2014 parachute tests for the ExoMars programme was performed by drop-test from balloons. This was followed up on in the summer of 2015 with full end-to-end dynamic stability tests of Earth re-entry capsule shapes. Several balloon

  20. Temporary Percutaneous Aortic Balloon Occlusion to Enhance Fluid Resuscitation Prior to Definitive Embolization of Post-Traumatic Liver Hemorrhage

    International Nuclear Information System (INIS)

    Matsuoka, Shin; Uchiyama, Katsuhiro; Shima, Hideki; Ohishi, Sonomi; Nojiri, Yoko; Ogata, Hitoshi

    2001-01-01

    We successfully stabilized severe hemorrhagic shock following traumatic liver injury by percutaneous transcarotid supraceliac aortic occlusion with a 5 Fr balloon catheter. Then we were able to perform transfemoral embolization therapy of the hepatic arterial bleeding source. Transient aortic occlusion using a balloon catheter appears to be a useful adjunct in select cases where stabilization of the patient is necessary to allow successful selective embolization of the bleeding source

  1. The ATIC Long Duration Balloon Project

    Science.gov (United States)

    Guzik, T.

    Long Duration Balloon (LDB) scientific experiments, launched to circumnavigate the south pole over Antarctica, have particular advantages compared to Shuttle or other Low Earth Orbit (LEO) missions in terms of cost, weight, scientific "duty factor" and work force development. The Advanced Thin Ionization Calorimeter (ATIC) cosmic ray astrophysics experiment is a good example of a university-based project that takes full advantage of current LDB capability and could effectively use future expansion in launch weight and flight duration. The ATIC experiment is currently being shipped to Antarctica in preparation for its first LDB science flight that will investigate the charge composition and energy spectra of primary cosmic rays over the energy range from about 101 0 to 10 1 4 eV. The instrument is built around a fully active, Bismuth Germanate (BGO) ionization calorimeter to measure the energy deposited by the cascades formed by particles interacting in a thick carbon target. A highly segmented silicon matrix, located above the target, provides good incident charge resolution plus rejection of the "backscattered" particles from the interaction. Trajectory reconstruction is based on the cascade profile in the BGO calorimeter, plus information from the three scintillator hodoscope layers in the target section above it. The hodoscope planes also provide the primary event trigger to initiate the detector readout, another measure of the incident particle charge and an indicator of the interaction point in the carbon material. The scientific payload weighs ~1,540 kg and consumes ~300 Watts of power supplied by a ~580 Watt solar array system. A full evaluation of the experiment was performed during a test flight occurring between 28 December 2000 and 13 January 2001 where ATIC was carried3 to an altitude of ~37 km above Antarctica by a ~850,000 m helium filled balloon for one circumnavigation of the continent. All systems behaved well, the detectors performed as expected

  2. Fasting and meal-suppressed ghrelin levels before and after intragastric balloons and balloon-induced weight loss

    NARCIS (Netherlands)

    Mathus-Vliegen, E. M. H.; Eichenberger, R. I.

    2014-01-01

    Intragastric balloons may be an option for obese patients with weight loss failure. Its mode of action remains enigmatic. We hypothesised depressed fasting ghrelin concentrations and enhanced meal suppression of ghrelin secretion by the gastric fundus through balloon contact and balloon-induced

  3. [Large balloon dilation for removal of choledocholithiasis difficult to extract: clinical experience].

    Science.gov (United States)

    Marin Calderón, Luis; Vera Calderón, Augusto; Gómez Correa, Aldo; Cervera Reyes, Zenon; Dávalos Moscol, Milagros; Alva Alva, Edgar; Palacios Salas, Fernando; Díaz Ríos, Ramiro; Guzmán Calderón, Edson; García Chihuan, Grisley

    2016-01-01

    The aim of this study was to report the initial experience of the combined use of biliary sphincterotomy plus balloon dilatation of the papilla for management of large stones. Design: Retrospective, descriptive. This study included 18 patients in whom a hydrostatic dilatation of the papilla with large balloons was performed between June 2012 and April 2014. Patients had multiple large stones, tapered distal common bile duct, previous sphincterotomy, or peri/ intradiverticular papilla. CRE™ dilatation balloons with diameters ranging from 12 to 20 mm were used. Data were recorded as successful procedure, use of lithotripsy and complications during the procedure. The average age was 66.1 years. There was a predominance of the female gender (66.7%). The average size of the bile duct stones was 16.7 mm. The main indications were: giant choledocholithiasis (12 patients, 66.7%) and tapered distal common bile duct (6 patients, 33.3%). The dilatation balloons diameter used were: 15 mm (8 patients, 44.4%), 18 mm (5 patients, 27.8%), 12 mm (3 patients, 16.7%) and 20 mm (2 patients, 11.1%). Complete stone clearance was achieved in 15 patients (83.3%). Lithotripsy was performed in 4 patients (22.2%). There were 3 patients in whom the removal with balloon was unsuccessful, performed surgical management. It was reported 1 case of mild acute pancreatitis (5.5%). The results show that endoscopic papillary large balloon dilation after sphincterotomy is a safe and effective technique for treatment of difficult bile duct stones.

  4. Onyx HD-500 embolization of intracranial aneurysms: modified technique using continuous balloon inflation under conscious sedation.

    Science.gov (United States)

    Rahme, Ralph; Grande, Andrew; Jimenez, Lincoln; Abruzzo, Todd A; Ringer, Andrew J

    2014-08-01

    The conventional technique of intracranial aneurysm embolization using Onyx HD-500 (ev3 Neurovascular, Irvine, CA, USA) involves repetitive balloon inflation-deflation cycles under general anesthesia. By limiting parent artery occlusion to 5 minutes, this cyclic technique is thought to minimize cerebral ischemia. However, intermittent balloon deflation may lengthen procedure time and allow balloon migration, resulting in intimal injury or Onyx leakage. We report our experience using a modified technique of uninterrupted Onyx injection with continuous balloon occlusion under conscious sedation. All Onyx embolization procedures for unruptured aneurysms performed by the senior author (A.J.R.) between September 2008 and April 2010 were retrospectively reviewed. Demographic, clinical, angiographic, and procedural data were recorded. Twenty-four embolization procedures were performed in 21 patients with 23 aneurysms, including four recurrences. Twenty aneurysms (87%) involved the paraclinoid or proximal supraclinoid internal carotid artery. Size ranged from 2.5 to 24mm and neck diameter from 2 to 8mm. The modified technique was employed in 19 cases. All but one patient (94.4%) tolerated continuous balloon inflation. Complete occlusion was achieved in 20 aneurysms (83.3%) and subtotal occlusion in three (12.5%). Stable angiographic results were seen in 85%, 94%, 94%, and 100% of patients at 6, 12, 24, and 36months, respectively. There were no deaths. Permanent non-disabling neurological morbidity occurred in one patient (4.2%). Minor, transient, and/or angiographic complications were seen in three patients (12.5%), none related to the technique itself. Onyx embolization of unruptured intracranial aneurysms can be safely and effectively performed using continuous balloon inflation under conscious sedation. Copyright © 2014 Elsevier Ltd. All rights reserved.

  5. Viscoresistive g-modes and ballooning

    International Nuclear Information System (INIS)

    Dagazian, R.Y.; Paris, R.B.

    1980-01-01

    The resistive G-mode and its particular form, the resistive ballooning mode, are treated as limits of a single simple model. MHD theory including parallel and perpendicular viscosity, finite shear, and finite beta is employed to study their linear stability

  6. Low dose intravaginal misoprostol versus intracervical balloon ...

    African Journals Online (AJOL)

    Background:The efficacy and safety of low dose misoprostol as a ripening agent compared to the widely used balloon catheter in developing countries is undetermined. Objective:To compare the safety and efficacy of a low dose intravaginal misoprostol and intracervical Foley's catheter for cervical ripening. Design:A ...

  7. Double-balloon endoscopy: Who needs it?

    DEFF Research Database (Denmark)

    Hendel, J.W.; Vilmann, P.; Jensen, T.

    2008-01-01

    Objective. Double-balloon endoscopy (DBE) made the small bowel accessible to inspection and therapy in its entirety. However, DBE is a time-consuming procedure that requires a highly skilled endoscopist, several nurses and - more often than not - anesthesiological support. This makes the selection...

  8. Percutaneous Treatment of Intrahepatic Biliary Leak: A Modified Occlusion Balloon Technique

    Energy Technology Data Exchange (ETDEWEB)

    Nasser, Felipe; Rocha, Rafael Dahmer, E-mail: rafaeldrocha@gmail.com; Falsarella, Priscila Mina; Motta-Leal-Filho, Joaquim Maurício da; Azevedo, André Arantes; Valle, Leonardo Guedes Moreira; Cavalcante, Rafael Noronha; Garcia, Rodrigo Gobbo; Affonso, Breno Boueri; Galastri, Francisco Leonardo [Hospital Israelita Albert Einstein, Department of Interventional Radiology (Brazil)

    2016-05-15

    PurposeTo report a novel modified occlusion balloon technique to treat biliary leaks.MethodsA 22-year-old female patient underwent liver transplantation with biliary-enteric anastomosis. She developed thrombosis of the common hepatic artery and extensive ischemia in the left hepatic lobe. Resection of segments II and III was performed and a biliary-cutaneous leak originating at the resection plane was identified in the early postoperative period. Initial treatment with percutaneous transhepatic drainage was unsuccessful. Therefore, an angioplasty balloon was coaxially inserted within the biliary drain and positioned close to the leak.ResultsThe fistula output abruptly decreased after the procedure and stopped on the 7th day. At the 3-week follow-up, cholangiography revealed complete resolution of the leakage.ConclusionThis novel modified occlusion balloon technique was effective and safe. However, greater experience and more cases are necessary to validate the technique.

  9. Mechanical properties of ANTRIX balloon film and fabrication of single cap large volume balloons

    Science.gov (United States)

    Suneel Kumar, B.; Sreenivasan, S.; Subba Rao, J. V.; Manchanda, R. K.

    2008-11-01

    The zero pressure plastic balloons used for high altitude studies are generally made from polyethylene material. Tensile properties of the thin film polymer are the key parameters for material selection due to extremely low temperature of -90 °C encountered by the balloons in the tropopause region during the ascent at equatorial latitudes. The physical and structural properties of the material determine the uniformity of the stress distribution over the entire shell. Load stresses from the suspended load propagate via load tapes heat sealed along with the gore seals as per the balloon design. A balance between this heat seal strength and the film strength is a desirable property of the basic resin in terms of the bubble strength, gauge uniformity, and long-term storage properties. In addition, the design of the top shell of the balloon and its stress distribution play an important role since only a fraction of the balloon is deployed during the filling operation and the ascent. In this paper we describe the mechanical properties of the 'ANTRIX' film developed by us and the optimized design of single cap balloons, which have been successfully used in our experiments over the past 5 years.

  10. Percutaneous sharp recanalization of a membranous IVC occlusion with an occlusion balloon as a needle target

    Directory of Open Access Journals (Sweden)

    Michael D. Rivers-Bowerman, MD, MSc, FRCPC

    2017-09-01

    Full Text Available A 50-year-old male with right upper quadrant symptoms and hepatic dysfunction was found to have multiple dilated hepatic veins (HVs with intrahepatic collateralization and membranous occlusion of the intrahepatic inferior vena cava (IVC consistent with primary Budd–Chiari syndrome. Venacavograms depicted drainage of the intrahepatic collaterals through a left-sided HV entering the IVC above the level of the occlusion. Sharp recanalization of the membranous IVC occlusion was performed with an occlusion balloon as a needle target under echocardiographic monitoring followed by balloon angioplasty with restoration of IVC patency. Clinical, laboratory, and venographic procedural success has been demonstrated to 9 months with minimal residual stenosis.

  11. A Simple Radiological Technique for Demonstration of Incorrect Positioning of a Foley Catheter with Balloon Inflated in the Urethra of a Male Spinal Cord Injury Patient

    Directory of Open Access Journals (Sweden)

    Subramanian Vaidyanathan

    2006-01-01

    Foley catheter should be located within the urinary bladder, but when the Foley catheter is misplaced with the balloon inflated in the urethra, a round opaque shadow of the Foley balloon is seen separately below the urinary bladder. This radiological study takes only a few minutes to perform, can be carried out bedside with a mobile X-ray machine, and does not require special expertise or preparations, unlike transrectal ultrasonography. When a Foley balloon is inflated in the urethra, abdominal ultrasonography will show an absence of the Foley balloon within the bladder. The technique described above aids in positive demonstration of a Foley balloon lying outside the urinary bladder. Such documentation proves valuable in planning future treatment, education of health professionals, and settlement of malpractice claims.

  12. NASA balloon design and flight - Philosophy and criteria

    Science.gov (United States)

    Smith, I. S., Jr.

    1993-01-01

    The NASA philosophy and criteria for the design and flight of scientific balloons are set forth and discussed. The thickness of balloon films is standardized at 20.3 microns to isolate potential film problems, and design equations are given for specific balloon parameters. Expressions are given for: flight-stress index, total required thickness, cap length, load-tape rating, and venting-duct area. The balloon design criteria were used in the design of scientific balloons under NASA auspices since 1986, and the resulting designs are shown to be 95 percent effective. These results represent a significant increase in the effectiveness of the balloons and therefore indicate that the design criteria are valuable. The criteria are applicable to four balloon volume classes in combination with seven payload ranges.

  13. Coriolis Mass-Flowmeter for aerostatic gas amount determination in zero pressure stratosperic balloons.

    Science.gov (United States)

    Behar, Jean-Baptiste

    2016-07-01

    The CNES ballooning community regularly operates zero pressure balloons in many countries around the world (recently in France, Sweden, Canada and soon, Australia in 2017). An important operational flight parameter is the aerostatic gas mass injected into the balloon (currently helium and hydrogen in the study). Besides the lifting force, it determines mainly the ascent rate from which the adiabatic expansion depends directly. A too high ascent velocity in very cold air temperature profiles could result in a gas temperature drop which if too great, might induce brittleness of the envelope. A precise gas mass determination is therefore critical for performance as well as for mission safety. The various gas supply tanks in various countries all have different characteristics with possible uncertainties with regard to their volumes. This makes the currently used gas mass determination method based on supply tank pressure measurements unreliable. This method also relies on tank temperature, another source of inaccuracy in the gas amount determination. CNES has therefore prospected for alternative methods to reduce inaccuracies and perhaps also ease the operational procedures during balloon inflation. Coriolis mass-flowmeters which have reached industrial maturity, offer the great advantage over other flowmeters to be able to directly measure the mass of the transferred fluid, and not deducing it from other parameters as other types of flowmeters would do. An industrial contractor has been therefore assigned to integrate this solution into the CNES operational setup. This new system is to be tested in February 2016. The presentation will briefly explain the Coriolis flowmeter's principle and display the February 2016 performance tests' results. The expected incidence on zero pressure balloons' trajectories will also be discussed based on simulations ran on a balloon flight simulator software.

  14. Beam Tests of the Balloon-Borne ATIC Experiment

    Science.gov (United States)

    Ganel, O.; Adams, J. H., Jr.; Ahn, E. J.; Ampe, J.; Bashindzhagyan, G.; Case, G.; Chang, J.; Ellison, S.; Fazely, A.; Gould, R.

    2003-01-01

    The Advanced Thin Ionization Calorimeter (ATIC) balloon-borne experiment is designed to perform cosmic-ray elemental spectra measurement from 50 GeV to 100 TeV for nuclei from hydrogen to iron. These measurements are expected to provide crucial hints about some of the most fundamental questions in astroparticle physics today. ATTIC'S design centers on an 18 radiation length (X(sub Omnicron)) deep bismuth germanate (BGO) calorimeter, preceded by a 0.75 lambda(sub int) graphite target. In September 1999 the ATIC detector was exposed to high-energy beams at CERN's SPS accelerator, within the framework of the development program for the Advanced Cosmic-ray Composition Experiment for the Space Station (ACCESS). In December 2000 - January 2001, ATIC flew on the first of a series of long duration balloon (LDB) flights from McMurdo Station, Antarctica. We present here results from the 1999 beam-tests, including energy resolutions for electrons and protons at several beam energies from 100 GeV to 375 GeV, as well as signal linearity and collection efficiency estimates. We show how these results compare with expectations based on simulations, and their expected impacts on mission performance.

  15. Aortic valvuloplasty of calcific aortic stenosis with monofoil and trefoil balloon catheters: practical considerations

    NARCIS (Netherlands)

    S. Plante (Sylvain); M.J.B.M. van den Brand (Marcel); L.C.P. van Veen; C. di Mario (Carlo); C.E. Essed; K.J. Beatt (Kevin); P.W.J.C. Serruys (Patrick)

    1990-01-01

    textabstractIn order to evaluate the relation between balloon design (monofoil, trefoil) and valvular configuration, experimental aortic valvuloplasty was performed in four post-mortem hearts with calcific aortic stenosis of various morphology. The degree of obstruction of the aortic orifice was

  16. Diagnostic and therapeutic double-balloon enteroscopy after small bowel Roux-en-Y reconstructive surgery.

    Science.gov (United States)

    Moreels, Tom G; Hubens, Guy J; Ysebaert, Dirk K; Op de Beeck, Bart; Pelckmans, Paul A

    2009-01-01

    Roux-en-Y reconstruction excludes the afferent limb and the biliopancreatic system from conventional endoscopic access. Postoperative problems in these excluded gastrointestinal systems are therefore often dealt with surgically. We investigated the usefulness of the therapeutic double-balloon enteroscope to perform interventional endoscopic procedures in the excluded segment of the gastrointestinal tract after Roux-en-Y reconstruction. 30 procedures were performed in 22 patients with Roux-en-Y reconstruction after enterobiliary anastomosis, gastrectomy or bariatric gastric bypass. All procedures were performed with the therapeutic double-balloon enteroscope, under general anesthesia and with fluoroscopic control. ERCP at the enterobiliary anastomosis was successful in 90% (n = 10) of the procedures. ERCP at the intact papilla was successful in 60% (n = 5). Enterocutaneous fistula closure after (sub)total gastrectomy was performed in 2 procedures. Successful diagnostic procedures encompassed intubation of the excluded stomach after bariatric gastric bypass (89%, n = 9) or the afferent limb after Roux-en-Y reconstruction (75%, n = 4). The overall success rate in accessing the aimed excluded segment with the double-balloon enteroscope was 87%. Interventional procedures were able to avoid surgery in 65%. One retroperitoneal perforation occurred during ERCP which was conservatively treated. Excluded gastrointestinal segments after Roux-en-Y reconstruction can be accessed with a substantial success rate using double-balloon enteroscopy. Therapeutic interventions like ERCP can prevent surgery in the majority of patients. Copyright 2009 S. Karger AG, Basel.

  17. Ballooning for Biologists: Mission Essentials for Flying Experiments on Large NASA Balloons

    Science.gov (United States)

    Smith, David J.; Sowa, Marianne

    2017-01-01

    Despite centuries of scientific balloon flights, only a handful of experiments have produced biologically-relevant results. Yet unlike orbital spaceflight, it is much faster and cheaper to conduct biology research with balloons, sending specimens to the near space environment of Earths stratosphere. Samples can be loaded the morning of a launch and sometimes returned to the laboratory within one day after flying. The National Aeronautics and Space Administration (NASA) flies large, unmanned scientific balloons from all over the globe, with missions ranging from hours to weeks in duration. A payload in the middle portion of the stratosphere (approx. 35 km above sea level) will be exposed to an environment similar to the surface of Mars: temperatures generally around -36 C, atmospheric pressure at a thin 1 kPa, relative humidity levels <1%, and a harsh illumination of ultraviolet (UV) and cosmic radiation levels (about 100 W/sq m and 0.1 mGy/d, respectively) that can be obtained nowhere else on the surface of the Earth, including environmental chambers and particle accelerator facilities attempting to simulate space radiation effects. Considering the operational advantages of ballooning and the fidelity of space-like stressors in the stratosphere, researchers in aerobiology, astrobiology, and space biology can benefit from balloon flight experiments as an intermediary step on the extraterrestrial continuum (ground, low Earth orbit, and deep space studies). Our presentation targets biologists with no background or experience in scientific ballooning. We will provide an overview of large balloon operations, biology topics that can be uniquely addressed in the stratosphere, and a roadmap for developing payloads to fly with NASA.

  18. Measurements of Intra-Aortic Balloon Wall Movement During Inflation and Deflation: Effects of Angulation.

    Science.gov (United States)

    Bruti, Gianpaolo; Kolyva, Christina; Pepper, John R; Khir, Ashraf W

    2015-08-01

    The intra-aortic balloon pump (IABP) is a ventricular assist device that is used with a broad range of pre-, intra-, and postoperative patients undergoing cardiac surgery. Although the clinical efficacy of the IABP is well documented, the question of reduced efficacy when patients are nursed in the semi-recumbent position remains outstanding. The aim of the present work is therefore to investigate the underlying mechanics responsible for the loss of IABP performance when operated at an angle to the horizontal. Simultaneous recordings of balloon wall movement, providing an estimate of its diameter (D), and fluid pressure were taken at three sites along the intra-aortic balloon (IAB) at 0 and 45°. Flow rate, used for the calculation of displaced volume, was also recorded distal to the tip of the balloon. An in vitro experimental setup was used, featuring physiological impedances on either side of the IAB ends. IAB inflation at an angle of 45° showed that D increases at the tip of the IAB first, presenting a resistance to the flow displaced away from the tip of the balloon. The duration of inflation decreased by 15.5%, the inflation pressure pulse decreased by 9.6%, and volume decreased by 2.5%. Similarly, changing the position of the balloon from 0 to 45°, the balloon deflation became slower by 35%, deflation pressure pulse decreased by 14.7%, and volume suctioned was decreased by 15.2%. IAB wall movement showed that operating at 45° results in slower deflation compared with 0°. Slow wall movement, and changes in inflation and deflation onsets, result in a decreased volume displacement and pressure pulse generation. Operating the balloon at an angle to the horizontal, which is the preferred nursing position in intensive care units, results in reduced IAB inflation and deflation performance, possibly compromising its clinical benefits. Copyright © 2015 The Authors. Artificial Organs published by Wiley Periodicals, Inc. on behalf of International Center for

  19. Assisted coiling of saccular wide-necked unruptured intracranial aneurysms: stent versus balloon.

    Science.gov (United States)

    Consoli, Arturo; Vignoli, Chiara; Renieri, Leonardo; Rosi, Andrea; Chiarotti, Ivano; Nappini, Sergio; Limbucci, Nicola; Mangiafico, Salvatore

    2016-01-01

    Assisted coiling with stents or balloons enables a higher percentage of complete occlusions of saccular unruptured intracranial aneurysms to be achieved with a reasonable complication rate. The aim of this study was to compare stent-assisted coiling and the balloon remodeling technique in terms of efficacy, stability, and safety for the treatment of comparable unruptured saccular intracranial aneurysms. 268 patients with 286 saccular unruptured wide-necked intracranial aneurysms were treated at our institution with stent- or balloon-assisted coiling and retrospectively reviewed. Statistical analysis was performed to assess significant differences between the two groups. The rate of complete occlusion at the end of the procedure was higher with stent-assisted coiling than with balloon-assisted coiling (86.8% vs 78%) and the same results were also observed after 6 months (92.1% vs 77.6%; p=0.05). About 50% of major recurrences occurred in large to giant aneurysms (p<0.001). The overall complication rate was similar in the stent-assisted and balloon-assisted groups (10.3% vs 9.3%). Independently of the technique, a higher complication rate was observed with bifurcational aneurysms, particularly in the middle cerebral artery (p=0.016). Stent-assisted coiling achieved better results in terms of complete occlusion and stability than balloon-assisted coiling with a lower rate of recurrence without being associated with a higher risk of intraprocedural complications. Bifurcational and large to giant aneurysms were associated with higher complication rates and higher recurrence rates, respectively, and still represent a challenge for both techniques. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

  20. Evolution of scientific ballooning and its impact on astrophysics research

    Science.gov (United States)

    Jones, William Vernon

    2014-05-01

    As we celebrate the centennial year of the discovery of cosmic rays on a manned balloon, it seems appropriate to reflect on the evolution of ballooning and its scientific impact. Balloons have been used for scientific research since they were invented in France more than 200 years ago. Ballooning was revolutionized in 1950 with the introduction of the so-called natural shape balloon with integral load tapes. This basic design has been used with more or less continuously improved materials for scientific balloon flights for more than a half century, including long-duration balloon (LDB) flights around Antarctica for the past two decades. The U.S. National Aeronautics and Space Administration (NASA) is currently developing the next generation super-pressure balloon that would enable extended duration missions above 99.5% of the Earth's atmosphere at any latitude. The Astro2010 Decadal Survey report supports super-pressure balloon development and the giant step forward it offers with ultra-long-duration balloon (ULDB) flights at constant altitudes for about 100 days.

  1. Electron observation with the balloon-borne CALET prototype detector

    Science.gov (United States)

    Torii, Shoji; Ozawa, Shunsuke; Kasahara, Katsuaki; Murakami, Hiroyuki; Akaike, Yosui; Aiba, Toshihide; Ueyama, Yoshitaka; Nakai, Mikio; Kai, Yuuichirou; Tamura, Tadahisa; Yoshida, Kenji; Katayose, Yusaku; Kawada, Jiro; Mizuta, Eiichi; Marrocchesi, Pier Simone; Kim, Meyoung; Bigongiari, Gabriele

    We have been carrying out an observation of the cosmic ray electrons, using the CALET prototype detector: bCALET. After the first flight of bCALET-1, the bCALET-2 was flown in 2009 at the JAXA balloon center at Taikicho for observing the electrons in 1-100 GeV. The detector is composed IMaging Calorimeter(IMC), Total AbSorption Calorimeter(TASC). IMC has an area of 256mmx256mm, and is consisted 8 layers of scintillating fiber belts intserted below tungsten plate (3 r.l. in total) for a fine imaging of shower particles. TASC is made 6 layers of BGO scintillator logs (25mm x 25mm x 300 mm in each) with an active area of 250mm x 250mm, for measurement the total energy deposit of incoming shower particles. The observation was successfully carried out, and the basic performance of the detector was confirmed to be consistent with the expectation by simulations. We will have the third flight of the bCALET-3 in 2010 at the Balloon Launch Center of Cachoeira Paulista in Brazil, to extend the energy region up to 1000 GeV. We will present the results of the bCALET-2 and the RD of the bCALET-3 detector.

  2. Balloon sinuplasty: a new concept in the endoscopic nasal surgery

    Directory of Open Access Journals (Sweden)

    Nogueira Júnior, João Flávio

    2008-12-01

    Full Text Available Introduction: Sinus diseases affect millions of people annually. Clinical treatment is effective in most patients, but in case of failure of this therapy the functional endoscopic surgery is currently the treatment choice for surgical treatment. The objective of the functional endoscopic surgery is to increase the aeration and drainage of the involved paranasal sinuses, which allows for the adequate functioning of the nasal mucosa mucociliary clearance. However, this method still has some limitations, mainly because it removes the nasal mucosa and bone tissue, and it may lead to physiologic alterations of the nasosinusal mucosa and cicatricial fibrosis. Many of these patients could be benefited from less invasive methods, with larger nasal mucosa preservation. Since 2006, an even less invasive procedure was remarked in our specialty: the balloon dilatation of the paranasal sinus ostia. Objective: The objective of this article is to define the concept of sinuplasty, its action mechanism, and present the necessary material for the procedures performance; to describe the techniques with the equipment in a nasosinusal endoscopic surgery simulator model and review the current literature about the indications, complications, results, and follow-up of patients submitted to this procedure. Balloon sinuplasty is safe and appears to be effective in the improvement of the quality of life of patients not responsive to conventional clinical therapy. New applications and indications for this equipment should be described and researched.

  3. Treatment of urethral strictures with balloon dilation: A forgotten tale

    Directory of Open Access Journals (Sweden)

    Konstantinos Stamatiou

    2015-09-01

    Full Text Available Urethral stricture is a common condition that can lead to serious complications such as urinary infections and renal insufficiency secondary to urinary retention. Treatment options include catheterization and dilation, urethroplasty and endoscopic internal urethrotomy as well. Although treatment option depends on the type, length and aetiology of stricture, the choice can be influenced to varying degrees by the simplicity of the method, the preferences of the patient the available accoutrements and the patient health condition. Both urethroplasty and endoscopic internal urethrotomy require anaesthesia and thus are not suitable for many elder and unfit for surgical treatment patients. On the other hand, dilations are easy to perform in every day clinical practice however they have been associated with iatrogenic urethral trauma. In contrast, balloon dilation under vision dilates by radial application of forces against the stricture, avoiding the potentially shearing forces associated with sequential rigid dilation. Since it reduces the possibility of an iatrogenic urethral trauma and the subsequent spongiofibrosis may lead into improved therapeutic outcomes. In this report we describe a technique for the treatment of urethral strictures with balloon dilation in elder and unfit for surgical treatment patients.

  4. Beam tests of the balloon-borne ATIC experiment

    CERN Document Server

    Ganel, O; Ahn, H S; Ampe, J; Bashindzhagian, G L; Case, G; Chang, H; Ellison, S; Fazely, A; Gould, R; Granger, D; Gunasingha, R M; Guzik, T G; Han, Y J; Isbert, J; Kim, H J; Kim, K C; Kim, S K; Kwon, Y; Panasyuk, M Y; Panov, A; Price, B; Samsonov, G; Schmidt, W K H; Sen, M; Seo, E S; Sina, R; Sokolskaya, N; Stewart, M; Voronin, A; Wagner, D; Wang, J Z; Wefel, J P; Wu, J; Zatsepin, V

    2005-01-01

    The Advanced Thin Ionization Calorimeter (ATIC) balloon-borne experiment is designed to perform cosmic-ray elemental spectra measurements from 50 GeV to 100 TeV for nuclei from hydrogen to iron. These measurements are expected to provide information about some of the most fundamental questions in astroparticle physics today. ATIC's design centers on an 18 radiation length (X0) deep bismuth germanate (BGO) calorimeter, preceded by a 0.75λint graphite target. In September 1999, the ATIC detector was exposed to high-energy beams at CERN's SPS accelerator within the framework of the development program for the Advanced Cosmic-ray Composition Experiment for the Space Station (ACCESS). In December 2000–January 2001 and again in December 2002–January 2003, ATIC flew on the first two of a series of long-duration balloon (LDB) flights from McMurdo Station, Antarctica. We present here results from the 1999 beam tests, including energy resolutions for electrons and protons at several beam energies from 100 to 375 G...

  5. Numerical Modelling Of Pumpkin Balloon Instability

    Science.gov (United States)

    Wakefield, D.

    Tensys have been involved in the numerical formfinding and load analysis of architectural stressed membrane structures for 15 years. They have recently broadened this range of activities into the `lighter than air' field with significant involvement in aerostat and heavy-lift hybrid airship design. Since early 2004 they have been investigating pumpkin balloon instability on behalf of the NASA ULDB programme. These studies are undertaken using inTENS, an in-house finite element program suite based upon the Dynamic Relaxation solution method and developed especially for the non-linear analysis and patterning of membrane structures. The paper describes the current state of an investigation that started with a numerical simulation of the lobed cylinder problem first studied by Calladine. The influence of material properties and local geometric deformation on stability is demonstrated. A number of models of complete pumpkin balloons have then been established, including a 64-gore balloon with geometry based upon Julian Nott's Endeavour. This latter clefted dramatically upon initial inflation, a phenomenon that has been reproduced in the numerical model. Ongoing investigations include the introduction of membrane contact modelling into inTENS and correlation studies with the series of large-scale ULDB models currently in preparation.

  6. Long Duration Balloon Charge Controller Stack Integration

    Science.gov (United States)

    Clifford, Kyle

    NASA and the Columbia Scientific Balloon Facility are interested in updating the design of the charge controller on their long duration balloon (LDB) in order to enable the charge controllers to be directly interfaced via RS232 serial communication by a ground testing computers and the balloon's flight computer without the need to have an external electronics stack. The design involves creating a board that will interface with the existing boards in the charge controller in order to receive telemetry from and send commands to those boards, and interface with a computer through serial communication. The inputs to the board are digital status inputs indicating things like whether the photovoltaic panels are connected or disconnected; and analog inputs with information such as the battery voltage and temperature. The outputs of the board are 100ms duration command pulses that will switch relays that do things like connect the photovoltaic panels. The main component of this design is a PIC microcontroller which translates the outputs of the existing charge controller into serial data when interrogated by a ground testing or flight computer. Other components involved in the design are an AD7888 12-bit analog to digital converter, a MAX3232 serial transceiver, various other ICs, capacitors, resistors, and connectors.

  7. Intragastric balloon for treatment-resistant obesity: safety, tolerance, and efficacy of 1-year balloon treatment followed by a 1-year balloon-free follow-up

    NARCIS (Netherlands)

    Mathus-Vliegen, Elisabeth M. H.; Tytgat, Guido N. J.

    2005-01-01

    Background: Prior efforts to treat obesity with intragastric balloons were thwarted by high complication rates. Therefore, fundamental requirements for optimal balloon designs were defined. The aim of the present study was to investigate the effectiveness, the safety; and the tolerance of a new

  8. Temporary balloon occlusion as therapy for uncontrollable arterial hemorrhage in multiply injured patients

    International Nuclear Information System (INIS)

    Rieger, J.; Linsenmaier, U.; Rock, C.; Pfeifer, K.J.; Euler, E.

    1999-01-01

    Purpose: Presentation of temporary balloon occlusion as an interventional radiological method for managing hemorrhage in multiply injured patients with uncontrollable loss of blood. Method: Temporary, non-selective arterial occlusion by introduction of a balloon catheter contralaterally to the source of bleeding has been performed since 1992 on 7 patients with multiple injuries, hemorrhagic shock requiring reanimation, and angiographic demonstration of an arterial hemorrhage in the supply region of the internal iliac artery with complex pelvic fracture. In each case a PTA balloon catheter was introduced transfemorally, non-selectively positioned proximal to the bleeding source, and left in place for 24-48 h under manometric control. Control angiographies were performed prior to catheter removal. Results: The bleeding was stopped immediately in all 7 patients. The hemodynamic stability made transport and thus further surgical management and/or a short-term treatment in the intensive-care station possible. Control angiographies confirmed that the bleeding had stopped in all patients. Conclusions: We recommend temporary balloon occlusion as a rapid and effective method for the management of bleeding in otherwise uncontrollable traumatic hemorrhages in the supply region of the internal iliac artery. (orig.) [de

  9. Comparison between double-balloon and single-balloon enteroscopy in therapeutic ERC after Roux-en-Y entero-enteric anastomosis.

    Science.gov (United States)

    Moreels, Tom G; Pelckmans, Paul A

    2010-09-16

    To compare the efficacy of double-balloon enteroscopy (DBE) and single-balloon enteroscopy (SBE) in therapeutic endoscopic retrograde cholangiography (ERC) in patients with Roux-en-Y entero-enteric anastomosis. Retrospective analysis of our patient cohort revealed 4 patients with enterobiliary anastomosis and Roux-en-Y entero-enteric anastomosis who underwent repeated ERC with DBE and SBE because of recurrent cholangitis. A total of 38 endoscopic retrograde cholangiopancreatography procedures were performed in 25 patients with Roux-en-Y entero-enteric anastomosis. DBE was used in 29 procedures and SBE in 9. The 4 patients who underwent repeated ERC with DBE and SBE suffered from recurrent cholangitis due to stenosis of the enterobiliary anastomosis. ERC was performed repeatedly to achieve balloon dilation with/without biliary stone extraction and multiple stent placement at the level of the enterobiliary anastomosis. In all 4 patients DBE and SBE were equally successful. Compared to DBE, SBE was equally effective in passing the Roux-en-Y entero-enteric anastomosis, reaching the enterobiliary anastomosis and performing therapeutic ERC. This retrospective comparison shows that DBE and SBE are equally successful in the performance of therapeutic ERC at the level of the enterobiliary anastomosis after Roux-en-Y entero-enteric anastomosis.

  10. NASA balloon: Aircraft ranging, data and voice experiment

    Science.gov (United States)

    Wishna, S.; Hamby, C.; Reed, D.

    1972-01-01

    A series of tests to evaluate, at L-band, the ranging, voice, and data communications concepts proposed for the air traffic control experiment of the Applications Technology Satellite-F are described. The ground station facilities, balloon platforms and the aircraft were supplied by the European Space Research Organization. One ground simulation and two aircraft flights at low elevation angles were conducted. Even under high interference conditions good performance was obtained for both voice communications and side tone ranging. High bit errors occurred in the data channels resulting in false commands. As a result of the experience gained in operating the equipment in an aircraft environment several recommendations were made for improving the equipment performance.

  11. Endoscopic partial sphincterotomy coupled with large balloon papilla dilation – Single stage approach for management of extra-hepatic bile ducts macro-lithiasis

    Directory of Open Access Journals (Sweden)

    Gianfranco Donatelli

    2014-01-01

    We conclude that endoscopic partial sphincterotomy plus large papillary balloon dilation seems a promising, effective and safe approach to treat giant extrahepatic biliary calculi, if performed after correct patient selection and under established guidelines.

  12. Superpressure Balloon Design Using Nonlinear Viscoelasticity

    Science.gov (United States)

    Rand, James; Rand, James; Wakefield, David

    Stratospheric balloon platforms are used extensively by scientists for a variety of purposes. The typical balloon used today is the zero pressure natural shape fabricated from a thin film of linear low density polyethylene. This material has been found to possess a variety of desirable characteristics suitable to this environment. This film will remain ductile at very low temperatures which will permit it to develop large strains if necessary to satisfy equilibrium considerations. However, in order to achieve long duration flight without significant changes in altitude, the balloon should be pressurized to the extent necessary to maintain constant volume during typical variations in temperature. In the past, pressurized balloons were fabricated from other materials in order to achieve significant increases in strength. Thin films of polyester or polyimide have been used to make relatively small spheres capable of long duration flight. Unfortunately, these materials do not have the ductility of polyethylene at low temperature and are somewhat more fragile and subject to damage. In recent years various organizations have attempted to use the characteristic shape of a pumpkin to limit the stresses in a balloon envelope to that which can be accommodated by laminated fabric materials. While developing the design, analysis and construction techniques for this type of system, the use of polyethylene has been successfully demonstrated to provide a reliable envelope. This shape is achieved by using high strength members in the meridional direction to carry the very high loads generated by the pressure. These so called "tendons" have very low elongation and serve to limit the deformation of the film in that direction. However, earlier designs attempted to limit the stresses in the circumferential direction by using a lobe angle to control the stress. Unfortunately this has led to a number of stability problems with this type of balloon. In order to control the stability of

  13. Modular and Reusable Power System Design for the BRRISON Balloon Telescope

    Science.gov (United States)

    Truesdale, Nicholas A.

    High altitude balloons are emerging as low-cost alternatives to orbital satellites in the field of telescopic observation. The near-space environment of balloons allows optics to perform near their diffraction limit. In practice, this implies that a telescope similar to the Hubble Space Telescope could be flown for a cost of tens of millions as opposed to billions. While highly feasible, the design of a balloon telescope to rival Hubble is limited by funding. Until a prototype is proven and more support for balloon science is gained, projects remain limited in both hardware costs and man hours. Thus, to effectively create and support balloon payloads, engineering designs must be efficient, modular, and if possible reusable. This thesis focuses specifically on a modular power system design for the BRRISON comet-observing balloon telescope. Time- and cost-saving techniques are developed that can be used for future missions. A modular design process is achieved through the development of individual circuit elements that span a wide range of capabilities. Circuits for power conversion, switching and sensing are designed to be combined in any configuration. These include DC-DC regulators, MOSFET drivers for switching, isolated switches, current sensors and voltage sensing ADCs. Emphasis is also given to commercially available hardware. Pre-fabricated DC-DC converters and an Arduino microcontroller simplify the design process and offer proven, cost-effective performance. The design of the BRRISON power system is developed from these low-level circuits elements. A board for main power distribution supports the majority of flight electronics, and is extensible to additional hardware in future applications. An ATX computer power supply is developed, allowing the use of a commercial ATX motherboard as the flight computer. The addition of new capabilities is explored in the form of a heater control board. Finally, the power system as a whole is described, and its overall

  14. [Balloon cell nevi of the conjunctiva (author's transl)].

    Science.gov (United States)

    Schlageter, P E; Daicker, B

    1975-06-01

    The clinical and histological features of three cases of conjunctival balloon cell nevi are described. This peculiar form of nevus is very rare in the conjunctiva. The findings are compared with the descriptions in the literature of dermal balloon cell nevi. They demonstrate, that the conjunctival and dermal tumours are of idential histological structure. The proliferations of the conjunctival epithelium often found in conjunctival nevi do not modify the balloon cell nevi. These can not be diagnosed clinically. The problems of the pathogenesis of the balloon cell nevi are discussed.

  15. Hyperspectral Polarimeter for Monitoring Balloon Strain, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — NASA's latest generation of superpressure, ultra long duration balloons (ULDB) extend the flight time for stratospheric experiments to levels previously unattainable...

  16. Deflation of gastric band balloon in pregnancy for improving outcomes.

    Science.gov (United States)

    Jefferys, Amanda E; Siassakos, Dimitrios; Draycott, Tim; Akande, Valentine A; Fox, Robert

    2013-04-30

    In line with the rise in the prevalence of obesity, an increasing number of women of childbearing age are undergoing laparoscopic adjustable gastric banding (LAGB), resulting in an increasing number of pregnancies with a band in place. Currently, there is no consensus on optimal band management in pregnancy. Some clinicians advocate leaving the band balloon inflated to reduce gestational weight gain and associated adverse perinatal outcomes. However, there are concerns that maintaining balloon inflation during pregnancy might increase the risk of band complications and adversely affect fetal development and/or growth as a result of reduced nutritional intake. To compare maternal and perinatal outcomes for elective gastric band balloon deflation versus intention to maintain balloon inflation during pregnancy. We searched the Cochrane Pregnancy and Childbirth Group's Trials Register (30 September 2012) and the Web of Science database (1940 to September 2012). Randomised-controlled trials comparing elective deflation of the gastric band balloon with intention to maintain balloon inflation in pregnant women who have undergone LAGB. Two review authors independently assessed studies for inclusion. No studies met the criteria for inclusion in the review. To date no randomised controlled trials exist that compare elective deflation of the gastric band balloon in pregnancy versus intention to maintain balloon inflation. Further research is needed to define the optimum management of the gastric band balloon in pregnancy.

  17. AUTOPERFUSION BALLOON CATHETER FOR COMPLICATED CORONARY ANGIOPLASTY - A PROSPECTIVE-STUDY WITH RETROSPECTIVE CONTROLS

    NARCIS (Netherlands)

    DEMUINCK, ED; VANDIJK, RB; DENHEIJER, P; MEEDER, JG; LIE, KI

    1992-01-01

    Prolonged angioplasty balloon inflation with an autoperfusion balloon for failed conventional coronary angioplasty, was compared with emergency surgery for this condition. Restenosis was assessed 6 weeks after successful intervention with the autoperfusion balloon. Forty consecutive patients with

  18. Results from a student built balloon-borne infrasound sensing instrument

    Science.gov (United States)

    Klein, Viliam; Young, Eliot; Bowman, Daniel; Abernathy, Robert

    2017-04-01

    Balloon-borne infrasound sensors should have two advantages over ground based counterparts: lack of wind noise, and the potential for infrasound concentration in stratospheric ducts. In this paper we present the design and results from a student-built payload for sensing infrasound waves (between 0.1Hz to 20Hz) from a NASA stratospheric balloon that reached altitudes of 37km on September 28th of 2016. The SISE (Student Infrasound Experiment) uses a unique arrangement of COTS differential pressure sensors and student designed signal conditioning to eliminate noise and sense infrasound waves below 20Hz. To calibrate the sensitivity of ground based and balloon-borne sensors, we contracted EMRTC to set off three large explosions from Socorro NM during flight, roughly 200-400 km west of the balloon position at the time of the explosions. The goal of this experiment was to detect the artificially generated infrasound waves at altitude despite the lower expected amplitudes. This presentation contains discussions of the overall design for the instrument, laboratory and in flight performance characteristics, as well as in flight observations of infrasound generated from the artificial sources. The instrument successfully detected infrasound waves of about 0.03 Pa at an altitude of 37 kilometers and a distance of 350km from the source.

  19. Immediate and Short-term Follow-Up of Aortic Coarctation Balloon Angioplasty and Stenting

    Directory of Open Access Journals (Sweden)

    Hasan Mottaghi Moghadam

    2017-12-01

    Full Text Available Background Aortic Coarcatation (CoA is one of the congenital heart diseases with the rate of 5-8% of Coronary heart diseases(CHDs. Balloon angioplasty is now one of the effective way of treatment for CoA, native or Re-coarctation (Re-CoA. We aimed to assess the immediate, and short term response to angioplasty and stenting, and also complications. Materials and Methods Balloon angioplasty with our without stenting was performed for 53 patients with native or Re-coarcatation angioplasty (39 balloon angioplasty alone, and 14 balloon and stenting. Pressure gradient across the CoA segment was measured initially by Echo and pre, and Post procedure. Echocardiography was also used for follow up assessment during 24 hours, one and 6 months afterward. Results Among 53 patients, 52.8% were male. There were 98.2% native and 3.8% Re-CoA. The mean age of patients was 8.65 ± 8.37 years, and the mean weight was 25.82±20.73 kg. The mean pressure gradient acrossthe CoA site before angioplasty was 24.88±12.32, and post procedure gradient was 4.77±6.42 (p

  20. Quantitative angiographic comparison of elastic recoil after coronary excimer laser-assisted balloon angioplasty and balloon angioplasty alone.

    Science.gov (United States)

    Strikwerda, S; van Swijndregt, E M; Melkert, R; Serruys, P W

    1995-02-01

    Coronary lumen changes during and after excimer laser-assisted balloon angioplasty were measured by quantitative coronary angiography, and the results were compared with the effects of balloon angioplasty alone. Reduction of atherosclerotic tissue mass by laser ablation in the treatment of coronary artery disease may be more effective in enlarging the lumen than balloon angioplasty alone. A series of 57 consecutive coronary lesions successfully treated by xenon chloride excimer laser-assisted balloon angioplasty were individually matched with 57 coronary artery lesions successfully treated by balloon angioplasty alone. The following variables were measured by quantitative coronary analysis: 1) ablation by laser, 2) stretch by balloon dilation, 3) elastic recoil, and 4) acute gain. Matching by stenosis location, reference diameter and minimal lumen diameter resulted in two comparable groups of 57 lesions with identical baseline stenosis characteristics. Minimal lumen diameter before excimer laser-assisted balloon angioplasty and balloon angioplasty alone were (mean +/- SD) 0.73 +/- 0.44 and 0.74 +/- 0.43 mm, respectively. Laser ablation significantly improved minimal lumen diameter by 0.56 +/- 0.44 mm before adjunctive balloon dilation. In both treatment groups, similar-sized balloon catheters (2.59 +/- 0.35 and 2.56 +/- 0.40 mm, respectively) were used. After laser-assisted balloon angioplasty, elastic recoil was 0.84 +/- 0.30 mm (32% of balloon size), which was identical to that after balloon angioplasty alone, namely, 0.82 +/- 0.32 mm (32%). Consequently, both interventions resulted in similar acute gains of 1.02 +/- 0.52 and 1.00 +/- 0.56 mm, respectively. Minimal lumen diameter after intervention was equal in both groups: 1.75 +/- 0.35 and 1.75 +/- 0.34 mm, respectively. The statistical power of this study in which a 25% difference in elastic recoil (0.2 mm) between groups was considered clinically important was 95%. In matched groups of successfully treated

  1. Balloon-occluded retrograde transvenous obliteration for gastric variceal bleeding patient

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Young Hwan; Seong, Chang Kyu; Kim, Yong Joo; Park, Noh Hyuk [Kyungpook National University School of Medicine, Daegu (Korea, Republic of); Shin, Tae Beom [Dong-A University Medical Center, Pusan (Korea, Republic of); Choi, Jin Soo [Soonchunhyang University College of Medicine, Asan (Korea, Republic of)

    2003-03-01

    To evaluate the technical feasibility and clinical efficacy of balloon-occluded retrograde transvenous obliteration (BRTO) in the treatment of gastric variceal bleeding. Between September 2001 and March 2002, ten patients with gastric variceal bleeding and gastrorenal shunt, underwent BRTO. Three of the ten also had hepatic encephalopathy. To evaluated the gastrorenal shunt and exclude portal vein thrombosis, all patients underwent pre-procedural CT scanning. An occlusion balloon catheter was inserted from the right internal jugular vein and on ballooning was wedged into the left adrenal vein. A sclerosing agent (5% ethanolamine oleate-lipiodol mixture) was injected until the varices were completely filled. In four patients, the collateral veins seen at balloon-occluded adrenal venography were embolized with coils prior to sclerotherapy. Post-procedural follow-up CT (n=3) or endoscopy (n=8) was performed 1-4 weeks later, and both before and after the procedure, hepatic function was also monitored. Treatment was successful in nine cases: the failure involed rupture of the occlusion balloon during inflation, and a transjugular intrahepatic portosystemic shunt was performed. The cessation of bleeding was confirmed endoscopically or clinically; in three patients, follow-up CT showed complete obliteration of the varices. Hepatic function improved in eight patients, but three weeks after the procedure, one expired due to progressive infiltrative hepatoma. The clinical symptoms of the three patients with hepatic encephalopathy showed remarkable improvement. Although more extensive studies and long-term follow up are needed to overcome the limitations of our study, we believe that BRTO is a technically feasible and clinically effective treatment for gastric varices and hepatic encephalopathy.

  2. Angiographic balloon test occlusion and therapeutic sacrifice of major arteries to the brain.

    Science.gov (United States)

    Sorteberg, Angelika; Bakke, Søren Jacob; Boysen, Morten; Sorteberg, Wilhelm

    2008-10-01

    Treatment of certain cerebral aneurysms, caroticocavernous fistulae, and tumors of the neck or cranial base may involve therapeutic arterial sacrifice, which requires preoperative knowledge of the feasibility of permanent occlusion of the internal carotid artery (ICA) or vertebral artery or arteries. Retrospective study of transcranial Doppler ultrasonography-monitored angiographic balloon test occlusion and therapeutic sacrifice of the ICA or vertebral artery. We performed transcranial Doppler-guided balloon test occlusion in 136 patients at a procedural risk equivalent to that of conventional neuroangiography, and with correct prediction of the hemodynamic result of therapeutic arterial sacrifice in all instances. Patients with an immediate drop in ipsilateral middle cerebral artery (MCA) velocity to 65% or more of baseline values upon ICA balloon occlusion tolerated ICA sacrifice well, whereas hemodynamic infarction is likely in those with a corresponding drop in MCA velocity to 54% or less. When ICA balloon occlusion caused a drop in MCA velocity to between 55 and 64% of baseline, the pulsatility of the MCA signal had to be analyzed. Patients who tolerated bilateral vertebral artery closure had reversal of flow and an increase in velocity in the P1 section of the posterior cerebral artery. In 212 patient-years of observation after therapeutic arterial sacrifice, no de novo aneurysms formed. Angiographic balloon test occlusion with transcranial Doppler monitoring can be performed ultra-swiftly at a risk equal to conventional neuroangiography and with correct prediction of the hemodynamic outcome of arterial sacrifice. Elective therapeutic arterial occlusion is a safe and efficient treatment of large cerebral aneurysms and caroticocavernous fistulae.

  3. Multiorder etalon sounder (MOES) development and test for balloon experiment

    Science.gov (United States)

    Hays, Paul B.; Wnag, Jinxue; Wu, Jian

    1993-12-01

    concept and laboratory experiments were worked on for the past several years. Both theoretical studies and laboratory prototype experiments showed that MOES is very competitive compared with other high resolution sounders in terms of complexity and performance and has great potential as a compact and rugged high resolution atmospheric temperature and trace species sounder from the polar platform or the geostationary platform. The logical next step is to convert our laboratory prototype to a balloon instrument, so that field test of MOES can be carried out to prove the feasibility and capability of this new technology. Some of the activities related to the development of MOES for a possible balloon flight demonstration are described. Those research activities include the imaging quality study on the CLIO, the design and construction of a MOES laboratory prototype, the test and calibration of the MOES prototype, and the design of the balloon flight gondola.

  4. Safety and Efficacy Studies of Vertebroplasty, Kyphoplasty, and Mesh-Container-Plasty for the Treatment of Vertebral Compression Fractures: Preliminary Report.

    Directory of Open Access Journals (Sweden)

    Chen Chen

    Full Text Available To evaluate the clinical safety and efficacies of percutaneous vertebroplasty (PVP, percutaneous kyphoplasty (PKP, and percutaneous mesh-container-plasty (PMCP for the treatment of vertebral compression fractures (VCFs, a retrospective study of 90 patients with VCFs who had been treated by PVP (n = 30, PKP (n = 30, and PMCP (n = 30 was conducted. The clinical efficacies of these three treatments were evaluated by comparing their PMMA cement leakages, cement patterns, height restoration percentages, wedge angles, visual analogue scales (VAS, and oswestry disability index (ODI at the pre- and post-operative time points. 6.67%, 3.33%, and 0% of patients had PMMA leakage in PVP, PKP, and PMCP groups, respectively. Three (solid, trabecular, and mixed patterns, two (solid and mixed patterns, and one (mixed patterns types of cement patterns were observed in PVP, PKP, and PMCP groups, respectively. PKP and PMCP treatments had better height restoration ability than PVP treatment. PVP, PKP, and PMCP treatments had significant and similar ability in pain relief and functional recovery ability for the treatment of VCFs. These results indicate minimally invasive techniques were effective methods for the treatment of VCFs. Moreover, these initial outcomes suggest PMCP treatment may be better than both PVP treatment and PKP treatment.

  5. LOAC: a small aerosol optical counter/sizer for ground-based and balloon measurements of the size distribution and nature of atmospheric particles - Part 2: First results from balloon and unmanned aerial vehicle flights

    Science.gov (United States)

    Renard, Jean-Baptiste; Dulac, François; Berthet, Gwenaël; Lurton, Thibaut; Vignelles, Damien; Jégou, Fabrice; Tonnelier, Thierry; Jeannot, Matthieu; Couté, Benoit; Akiki, Rony; Verdier, Nicolas; Mallet, Marc; Gensdarmes, François; Charpentier, Patrick; Mesmin, Samuel; Duverger, Vincent; Dupont, Jean-Charles; Elias, Thierry; Crenn, Vincent; Sciare, Jean; Zieger, Paul; Salter, Matthew; Roberts, Tjarda; Giacomoni, Jérôme; Gobbi, Matthieu; Hamonou, Eric; Olafsson, Haraldur; Dagsson-Waldhauserova, Pavla; Camy-Peyret, Claude; Mazel, Christophe; Décamps, Thierry; Piringer, Martin; Surcin, Jérémy; Daugeron, Daniel

    2016-08-01

    In the companion (Part I) paper, we have described and evaluated a new versatile optical particle counter/sizer named LOAC (Light Optical Aerosol Counter), based on scattering measurements at angles of 12 and 60°. That allows for some typology identification of particles (droplets, carbonaceous, salts, and mineral dust) in addition to size-segregated counting in a large diameter range from 0.2 µm up to possibly more than 100 µm depending on sampling conditions (Renard et al., 2016). Its capabilities overpass those of preceding optical particle counters (OPCs) allowing the characterization of all kind of aerosols from submicronic-sized absorbing carbonaceous particles in polluted air to very coarse particles (> 10-20 µm in diameter) in desert dust plumes or fog and clouds. LOAC's light and compact design allows measurements under all kinds of balloons, on-board unmanned aerial vehicles (UAVs) and at ground level. We illustrate here the first LOAC airborne results obtained from a UAV and a variety of scientific balloons. The UAV was deployed in a peri-urban environment near Bordeaux in France. Balloon operations include (i) tethered balloons deployed in urban environments in Vienna (Austria) and Paris (France), (ii) pressurized balloons drifting in the lower troposphere over the western Mediterranean (during the Chemistry-Aerosol Mediterranean Experiment - ChArMEx campaigns), (iii) meteorological sounding balloons launched in the western Mediterranean region (ChArMEx) and from Aire-sur-l'Adour in south-western France (VOLTAIRE-LOAC campaign). More focus is put on measurements performed in the Mediterranean during (ChArMEx) and especially during African dust transport events to illustrate the original capability of balloon-borne LOAC to monitor in situ coarse mineral dust particles. In particular, LOAC has detected unexpected large particles in desert sand plumes.

  6. Audit of radiation dose during balloon mitral valvuloplasty procedure

    International Nuclear Information System (INIS)

    Livingstone, Roshan S; Chandy, Sunil; Peace, B S Timothy; George, Paul; John, Bobby; Pati, Purendra

    2006-01-01

    Radiation doses to patients during cardiological procedures are of concern in the present day scenario. This study was intended to audit the radiation dose imparted to patients during the balloon mitral valvuloplasty (BMV) procedure. Thirty seven patients who underwent the BMV procedure performed using two dedicated cardiovascular machines were included in the study. The radiation doses imparted to patients were measured using a dose area product (DAP) meter. The mean DAP value for patients who underwent the BMV procedure from one machine was 19.16 Gy cm 2 and from the other was 21.19 Gy cm 2 . Optimisation of exposure parameters and radiation doses was possible for one machine with the use of appropriate copper filters and optimised exposure parameters, and the mean DAP value after optimisation was 9.36 Gy cm 2

  7. Balloon Eustachian Tuboplasty in children.

    Science.gov (United States)

    Leichtle, A; Hollfelder, D; Wollenberg, B; Bruchhage, K-L

    2017-06-01

    Endonasal ballon dilatation of the Eustachian tube (BET) is a promising treatment for Eustachian tube dysfunction with encouraging results over the last years in adults. In addition, in children, single studies demonstrated promising results, but revealed the necessity for broader and additional studies. Our retrospective analysis presents outcomes with BET in children with chronic obstructive dysfunction of the Eustachian tube, showing resistance to the conventional therapy after adenotomy with paracentesis or grommets (ventilation tubes). The data of 52 children, having undergone BET from April 2011 to April 2016, were retrospectively evaluated. Most children in our study presented middle ear effusion (47%), adhesive (21%), chronic otitis media (13%), or recurrent acute otitis media (11%). In 24 (37%) children, we combined BET with a paracentesis, in 5 (8%) patients with a tympanoplasty type I and in 3 (5%) patients with a type III. All children were assessed using an audiogram, tympanometry, and tubomanometry (50 mbar) before and after BET. In addition, we evaluated the results of the Lübecker questionnaire, which we performed before and after BET. The childrens' ear-related and quality of life-related symptoms, such as pressure equalization, ear pressure, hearing loss, pain and limitation in daily life, and satisfaction pre- and postoperatively, were analyzed. In the majority of patients, we could see an improvement in the ear pressure, hearing loss, limitation in daily life, and satisfaction with recurrent inflammations, underlined by better outcomes in the tubomanometry and the tympanogram. BET in children is a safe, efficient, and promising method to treat chronic tube dysfunction, especially as a second line treatment, when adenotomy, paracentesis, or grommets failed before.

  8. Pneumothorax, music and balloons: A case series

    Directory of Open Access Journals (Sweden)

    Shiferaw Dejene

    2013-01-01

    Full Text Available We describe two cases of spontaneous pneumothorax in young healthy adults with no underlying structural lung disease. The onset of pneumothorax was following physical activity including playing musical instruments and blowing of balloons. There is sparse data evaluating the pathophysiology of primary spontaneous pneumothorax in relation to increased mouth pressures. These cases highlight the possible physical effect of valsalva manoeuvre on transpulmonary pressures, and the potential risk of developing pneumothorax in otherwise healthy individuals. This aspect of pneumothorax development is worthy of further exploration, to better elucidate the mechanism and enhance our understanding of this common respiratory presentation.

  9. Resistive G-modes and ballooning

    International Nuclear Information System (INIS)

    Dagazian, R.Y.; Mondt, J.P.; Paris, R.B.

    1980-01-01

    A unified theory of the linear stability of the Roberts and Taylor type of resistive interchange and ballooning is presented. The effects of both parallel and perpendicular viscosity as well as of finite shear and finite β are included in a MHD treatment of the problem. Kinetic effects are also studied. The hybrid kinetic model with Vlasov ions and guiding center electrons has been appropriately generalized to allow for electron-ion collisions. The geometry is that of a plane slab with magnetic shear

  10. Simultaneous stent expansion/balloon deflation technique to salvage failed balloon remodeling.

    Science.gov (United States)

    Ladner, Travis R; He, Lucy; Davis, Brandon J; Froehler, Michael T; Mocco, J

    2016-04-01

    Herniation, with possible embolization, of coils into the parent vessel following aneurysm coiling remains a frequent challenge. For this reason, balloon or stent assisted embolization remains an important technique. Despite the use of balloon remodeling, there are occasions where, on deflation of the balloon, some coils, or even the entire coil mass, may migrate. We report the successful use of a simultaneous adjacent stent deployment bailout technique in order to salvage coil prolapse during balloon remodeling in three patients. Case No 1 was a wide neck left internal carotid artery bifurcation aneurysm, measuring 9 mm×7.9 mm×6 mm with a 5 mm neck. Case No 2 was a complex left superior hypophyseal artery aneurysm, measuring 5.3 mm×4 mm×5 mm with a 2.9 mm neck. Case No 3 was a ruptured right posterior communicating artery aneurysm, measuring 4 mm×4 mm×4.5 mm with a 4 mm neck. This technique successfully returned the prolapsed coil mass into the aneurysm sac in all cases without procedural complications. The closed cell design of the Enterprise VRD (Codman and Shurtleff Inc, Raynham, Massachusetts, USA) makes it ideal for this bailout technique, by allowing the use of an 0.021 inch delivery catheter (necessary for simultaneous access) and by avoiding the possibility of an open cell strut getting caught on the deflated balloon. We hope this technique will prove useful to readers who may find themselves in a similar predicament. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

  11. On-line correction of beam portals in the treatment of prostate cancer using an endorectal balloon device

    International Nuclear Information System (INIS)

    Ciernik, Ilja F.; Baumert, Brigitta G.; Egli, Peter; Glanzmann, Christoph; Luetolf, Urs M.

    2002-01-01

    Background: Reproducible target volume assessment is required in order to optimize portal field margins in the treatment of prostate cancer. The benefits of an endorectal balloon on target volume assessment remain unclear. Material and methods: Nine patients were treated with a daily placed air filled rectal balloon. Portal films and computer-associated tomography during the treatment were used to determine the position of the structures of interest. Comparative planning with or without a balloon was performed in order to determine rectal wall exposure to radiation. Results: The range of movements during treatment predicting the position of the prostate in relation to the symphysis was 0.05-0.59 cm in the lateral direction, 0.27-2.2 cm in the antero-posterior direction, and 0.33-1.8 cm in the crano-caudal direction, as compared to the position of the prostate predicted by the balloon ranging from 0.18 to 0.76 cm in the lateral direction, 0.22-1.68 cm in the antero-posterior direction, and 0.58-2.99 cm in the crano-caudal direction. Planning target volumes (PTV) margins as defined by the position of the balloon were 10 mm in the antero-posterior direction, 6 mm in the lateral direction, and 16 mm in the crano-caudal direction. The volume of rectal wall exposed to radiation was reduced from 40 (±12%) to 25% (±19%) with an endorectal balloon (P<0.05). Conclusions: Daily online correction with portal vision for external beam set-up is improved by an endorectal balloon device, leading to improved PTV margins and reduced radiation exposure of the rectal wall

  12. A balloon borne telescope for planetary observations with a fine pointing technology

    Science.gov (United States)

    Shoji, Yasuhiro; Onishi, Tomoya; Battazzo, Steve; Yoshimura, Atsushi; Sakamoto, Yuji; Yoshida, Kazuya; Takahashi, Yukihiro; Taguchi, Makoto

    sodium, flows anti-sunward and forms a long tail with a length of 1400 Mercury radii. The intensity profile along the tail shows several bumps, suggesting that temporal variations in sodium release from the surface occur in a day. However the cause is still unknown, because Mercury is only observable during a very short period around sunrise and sunset. The thin atmosphere in the stratosphere also provides darker daytime sky, which enables much longer observation of the Mercury sodium tail. In the presentation, the balloon borne telescope system, the test results of its pointing perfor-mance and the observation plan of the planets in 2011 will be reported.

  13. The Evaluation of Endoscopic Balloon Dilation Treatment for

    Directory of Open Access Journals (Sweden)

    Shokri-Shirvani Javad

    2009-10-01

    Full Text Available Balloon dilatation of stricture is one of the new treatment methods among patients with gastric outlet obstruction (GOO. However, the prevalence and underlying etiologies of GOO in various populations are different. The goal of the present study was to determine the effectiveness of endoscopic balloon dilatation and factors that would affect its success rate patients with benign etiology for GOO. Forty-five patients with the symptoms of benign GOO were randomly selected. Gastric outlet was delineated using double channel videoendoscopy. The information of initial balloon dilation was collected from recorded files. Balloon dilatation was repeated during the mean follow up of 9.9 ± 5.8 months. The severity of gastric pain was measured immediately before balloon dilatation and one month after procedure and was rated on a 10 cm visual analogue scale. The mean age of patients was 43.7 ± 18.1 years and 86.7% of them were men. Furthermore, 71.1% were H pylori positive. Response rate to endoscopic balloon dilatation was 80% and 8 patients underwent surgical resection. Weight loss was more frequent in non-responding group. The pain severity was significantly reduced more in responding subjects. No meaningful relationships were found between the responses to balloon dilatation and positive H pylori and cigarette smoking. Endoscopic balloon dilation is safe and effective for most patients with benign gastric outlet obstruction and has favorable long-term outcome.

  14. The Balloon Foot ; A Rare Presentation Of Congenital Constricting ...

    African Journals Online (AJOL)

    We present a case of a rare manifestation of congenital constricting annular band (CAB) in the lower extremity resulting in a severe excessive swelling of the foot which we have termed Balloon foot. The ballooned foot is caused by a progressive deepening of the circumferential constriction into the soft tissue of the lower ...

  15. Coronary artery angioplasty with a helical autoperfusion balloon catheter

    NARCIS (Netherlands)

    Gurbel, PA; Anderson, RD; vanBoven, AJ; denHeijer, P

    The initial in-hospital and long-term clinical experience with a helical autoperfusion balloon catheter in the treatment of coronary artery disease is reported, This new catheter design allows blood to flow passively around the inflated balloon through a protected helical channel molded into the

  16. External caps: An approach to stress reduction in balloons

    Science.gov (United States)

    Hazlewood, K. H.

    Recent findings of the catastrophic balloon failures investigation in the U.S.A. indicate that very large gross inflations, in balloons using present design philosophy, over-stress currently available materials. External caps are proposed as an economic approach to reducting those stresses to an acceptable level.

  17. Is endoscopic papillary large balloon dilation safe for treating large CBD stones?

    Science.gov (United States)

    Shim, Chan Sup; Kim, Ji Wan; Lee, Tae Yoon; Cheon, Young Koog

    2016-01-01

    In recent years, endoscopic papillary large balloon dilation (EPLBD) with endoscopic sphincterotomy (EST) has been shown to be an effective technique for the removal of large or difficult common bile duct (CBD) stones, as an alternative to EST. Reviewing the literature published since 2003, it is understood that EPLBD has fewer associated overall complications than EST. Bleeding occurred less frequently with EPLBD than with EST. There was no significant difference in postendoscopic retrograde cholangiopancreatography pancreatitis or perforation. Recent accumulated results of EPLBD with or even without EST suggest that it is a safe and effective procedure for the removal of large or difficult bile duct stones without any additional risk of severe adverse events, when performed under appropriate guidelines. Since use of a larger balloon can tear the sphincter as well as the bile duct, possibly resulting in bleeding and perforation, a balloon size that is equal to or smaller in diameter than the diameter of the native distal bile duct is recommended. The maximum transverse diameter of the stone and the balloon-stone diameter ratio have a tendency to affect the success or failure of complete removal of stones by large balloon dilation to prevent adverse effects such as perforation and bleeding. One should take into account the size of the native bile duct, the size and burden of stones, the presence of stricture of distal bile duct, and the presence of the papilla in or adjacent to a diverticulum. Even though the results of EPLBD indicate that it is a relatively safe procedure in patients with common duct stones with a dilated CBD, the recommended guidelines should be followed strictly for the prevention of major adverse events such as bleeding and perforation.

  18. The ballooning of fuel cladding tubes: theory and experiment

    International Nuclear Information System (INIS)

    Shewfelt, R.S.W.

    1988-01-01

    Under some conditions, fuel clad ballooning can result in considerable strain before rupture. If ballooning were to occur during a loss-of-coolant accident (LOCA), the resulting substantial blockage of the sub-channel would restrict emergency core cooling. However, circumferential temperature gradients that would occur during a LOCA may significantly limit the average strain at failure. Understandably, the factors that control ballooning and rupture of fuel clad are required for the analysis of a LOCA. Considerable international effort has been spent on studying the deformation of Zircaloy fuel cladding under conditions that would occur during a LOCA. This effort has established a reasonable understanding of the factors that control the ballooning, failure time, and average failure strain of fuel cladding. In this paper, both the experimental and theoretical studies of the fuel clad ballooning are reviewed. (author)

  19. Spectrum of the ballooning Schroedinger equation

    International Nuclear Information System (INIS)

    Dewar, R.L.

    1997-01-01

    The ballooning Schroedinger equation (BSE) is a model equation for investigating global modes that can, when approximated by a Wentzel-Kramers-Brillouin (WKB) ansatz, be described by a ballooning formalism locally to a field line. This second order differential equation with coefficients periodic in the independent variable θ k is assumed to apply even in cases where simple WKB quantization conditions break down, thus providing an alternative to semiclassical quantization. Also, it provides a test bed for developing more advanced WKB methods: e.g. the apparent discontinuity between quantization formulae for open-quotes trappedclose quotes and open-quotes passingclose quotes modes, whose ray paths have different topologies, is removed by extending the WKB method to include the phenomena of tunnelling and reflection. The BSE is applied to instabilities with shear in the real part of the local frequency, so that the dispersion relation is inherently complex. As the frequency shear is increased, it is found that trapped modes go over to passing modes, reducing the maximum growth rate by averaging over θ k

  20. THE KISSING BALLOON TECHNIQUE WITH 2 OVER-THE-WIRE BALLOON CATHETERS THROUGH A SINGLE 8-FRENCH GUIDING CATHETER

    NARCIS (Netherlands)

    DENHEIJER, P; BERNINK, PJLM; VANDIJK, RB; TWISK, SPM; LIE, KI

    Some of the newer over-the-wire coronary angioplasty catheters have shaft sizes of 3.0 French (F) or less. The inner diameter of modern 8-F guiding catheters is large enough to accommodate two of such balloon catheters. We report a kissing balloon procedure with two over-the-wire catheters through a

  1. Primary balloon angioplasty for symptomatic, high-grade intracranial stenosis.

    Science.gov (United States)

    Tomycz, Luke; Bansal, Neil K; Lockney, Tim; Strothers, Megan; Connors, John J; Shay, Scott; Singer, Robert J

    2013-01-01

    In light of recent controversy about the safety and efficacy of intracranial stenting, we sought to evaluate our experience with primary balloon angioplasty for symptomatic, high-grade intracranial stenosis. All intracranial angioplasty cases performed at Vanderbilt University Medical Center from 2006 to 2011 were retrospectively reviewed for degree of stenosis pre- and post-procedure. Immediate peri-procedural complications were evaluated as well as one-month and long-term outcomes. A total of 26 patients were included in the study with a mean age of 63.0 years and a mean follow-up of 350.2 days. The average pre-procedure stenosis was 71.2%. The immediate, average post-procedure stenosis was 46.6%, and the average post-procedure stenosis at last angiographic follow-up was 44.5%. Retreatment was required in only 3.8% of patients. The primary end-point of major stroke or death at 30 days was observed in 11.5%, and the overall intra-procedural complication rate was 7.7%. The incidence of stroke or death at last follow-up was 15.4%, which is comparable to the one-year stroke or death rate in the medical arm of the SAMPRISS trial. In this retrospective series, primary balloon angioplasty was found to be effective as a treatment option for symptomatic intracranial stenosis with the risk of stroke or death at 30 days higher than the medical arm of SAMPRIS but lower than the stenting arm. The one-year risk of stroke was comparable to that reported for the one-year outcomes in the SAMPRISS medical arm.

  2. Analysis of the Risk Factors of Surgery after Endoscopic Balloon Dilation for Small Intestinal Strictures in Crohn's Disease Using Double-balloon Endoscopy.

    Science.gov (United States)

    Nishida, Yu; Hosomi, Shuhei; Yamagami, Hirokazu; Yukawa, Tomomi; Nagami, Yasuaki; Tanaka, Fumio; Kamata, Noriko; Tanigawa, Tetsuya; Shiba, Masatsugu; Watanabe, Toshio; Tominaga, Kazunari; Fujiwara, Yasuhiro; Arakawa, Tetsuo

    2017-09-01

    Objective Balloon-assisted endoscopy enables access to and treatment of strictures in the small intestine using endoscopic balloon dilation (EBD); however, the long-term outcomes of EBD have not been sufficiently evaluated. This study evaluated the long-term outcomes of EBD in Crohn's disease to identify the risk factors associated with the need for subsequent surgical intervention. Methods We retrospectively analyzed patients with Crohn's disease who had undergone EBD with double-balloon endoscopy (DBE) for small intestinal strictures at a single center between 2006 and 2015. The long-term outcomes were assessed based on the cumulative surgery-free rate following initial EBD. Results Seventy-two EBD with DBE sessions and 112 procedures were performed for 37 patients during this period. Eighteen patients (48.6%) required surgery during follow-up. Significant factors associated with the need for surgery in a multivariate analysis were multiple strictures (adjusted hazard ratio, 14.94; 95% confidence interval, 1.91-117.12; p=0.010). One patient (6.7%) required surgery among 15 who had single strictures compared to 17 (77.3%) among 22 patients with multiple strictures. Conclusion In a multivariate analysis, the presence of multiple strictures was a significant risk factor associated with the need for surgery; therefore, a single stricture might be a good indication for EBD using DBE for small intestinal strictures in Crohn's disease patients.

  3. Unintended Thermal Injuries from Radiofrequency Ablation: Organ Protection with an Angioplasty Balloon Catheter in an Animal Model

    Directory of Open Access Journals (Sweden)

    Martha-Grace Knuttinen

    2014-01-01

    Full Text Available Objectives: The aim of this study was to investigate a novel approach of using a balloon catheter as a protective device to separate liver from the diaphragm or nearby bowel during radiofrequency ablation (RFA of hepatic dome tumors in an animal model. Materials and Methods: All experimental procedures were approved by animal Institutional Review Board. Using a 3 cm RF needle electrode, 70 hepatic ablation zones were created using ultrasound in 7 pigs. 50 lesions were created using balloon interposition between liver and diaphragm; 20 lesions were created using the balloon device interposed posteriorly between liver and bowel. Additional 21 control lesions were performed. Animals were sacrificed immediately; diaphragm and bowel were then visually inspected and sectioned. Diaphragmatic and bowel injury was then classified according to the depth of thickness. Results: Control lesions caused full thickness injury, either to diaphragm or bowel. During ablation of lesions with balloon interposition, there was significantly less diaphragmatic injury, P < 0.001 and less bowel injury, P < 0.01. Conclusion: Using balloon interposition as a protective device has advantages over previous saline infusion or CO 2 insufflation, providing a safe way to expand percutaneous RFA of liver tumors located on the undersurface of the diaphragm. In addition, this method may be used in protection of other organs adjacent to areas being ablated.

  4. Direct Observation of Long-Range Transport Using Continuously Sounding Balloons and Near-Real-Time Trajectory Modeling

    Science.gov (United States)

    Voss, P. B.; Zaveri, R. A.; Berkowitz, C. M.

    2009-12-01

    Controlled Meteorological (CMET) balloons have been used in several recent studies to measure long-range transport over periods as long as 30 hours and distances up to 1000 kilometers. By repeatedly performing shallow soundings as they drift, CMET balloons can quantify evolving atmospheric structure, mixing events, shear advection, and dispersion during transport. In addition, the quasi-Lagrangian wind profiles can be used to drive a multi-layer trajectory model in which the advected air parcels follow the underlying terrain, or are constrained by altitude, potential temperature, or tracer concentration. Data from a coordinated balloon-aircraft study of long range transport over Texas (SETTS 2005) show that the reconstructed trajectories accurately track residual-layer urban outflow (and at times even its fine-scale structure) over distances of many hundreds of kilometers. The reconstructed trajectories and evolving profile visualizations are increasingly being made available in near-real time during balloon flights, supporting data-driven flight planning and sophisticated process studies relevant to atmospheric chemistry and climate. Multilayer trajectories (black grids) derived from CMET balloon flight paths (grey lines) for a transport event across Texas in 2005.

  5. Non-atherosclerotic spontaneous coronary artery dissection revascularized by intravascular ultrasonography-guided fenestration with cutting balloon angioplasty.

    Science.gov (United States)

    Ito, Tsuyoshi; Shintani, Yasuhiro; Ichihashi, Taku; Fujita, Hiroshi; Ohte, Nobuyuki

    2017-07-01

    A 46-year-old woman was referred to our hospital due to chest pain. Twelve-lead electrocardiogram revealed ST-segment elevation suggesting acute myocardial infarction. Emergent coronary angiography showed diffuse narrowing and occlusion in the middle to distal left anterior descending artery (LAD). To investigate the cause of occlusion, an intravascular ultrasound (IVUS) examination was performed and we diagnosed spontaneous coronary artery dissection (SCAD) as the cause of occlusion. After a cutting balloon was dilated at the distal LAD, coronary flow recovered. IVUS-guided angioplasty with cutting balloon could be a choice of treatment in SCAD patients who need revascularization.

  6. A Model-Based Study of On-Board Data Processing Architecture for Balloon-Borne Aurora Observation

    Science.gov (United States)

    Lim, Chester

    2011-01-01

    This paper discusses an application of ISAAC design methodology to a balloon-borne payload electronic system for aurora observation. The methodology is composed of two phases, high level design and low level implementation, the focus of this paper is on the high level design. This paper puts the system architecture in the context of a balloon based application but it can be generalized to any airborne/space-borne application. The system architecture includes a front-end detector, its corresponding data processing unit, and a controller. VisualSim has been used to perform modeling and simulations to explore the entire design space, finding optimal solutions that meet system requirements.

  7. Transcranial Doppler US as an alternative to angiography and balloon occlusion in estimating risk of carotid occlusion

    International Nuclear Information System (INIS)

    Feaster, S.H.; Powers, A.; Laws, E.R.

    1990-01-01

    This paper demonstrates the reliability of transcranial Doppler (TCD) US in the evaluation of the adequacy of collateral vessel cerebral blood flow in patients being considered for carotid ligation or occlusion. TCD was utilized in 12 patients in an attempt to study collateral vessel blood flow during endovascular balloon occlusion of a carotid artery. This was correlated with TCD measurements performed during manual carotid compression and with cerebral angiography. Changes of blood flow velocity were measured in the ipsilateral MCA and ACA. Excellent correlation was noted between the TCD measurements during manual carotid compression and actual endovascular balloon occlusion. There was also qualitative agreement with the cross-compression angiogram

  8. [Application of temporary balloon blocking technique in bone tumors surgery under the aid of CT angiography].

    Science.gov (United States)

    Fang, Cheng; Hu, Yongcheng; Huang, Hongchao; Xia, Qun; Chen, Xiaopeng; Yuan, Binbin; He, Xin; Wang, Peng

    2014-10-01

    To study the value of CT angiography (CTA) in the surgical treatment of bone tumors with the temporary balloon blocking technique. A retrospective analysis was made on the clinical data of 36 bone tumor patients between April 2008 and October 2013. There were 22 males and 14 females, aged from 25 to 83 years (mean, 46 years). The tumor located at the sacrococcygeal region in 17 cases, at the ilium in 12 cases, at the pubis in 5 cases, and at the proximal femur in 2 cases. Before surgery, CTA was performed to measure the external diameter of aortaventralis and arteria iliac communis, and the distance between the low renal artery and the abdominal aortic bifurcation as well as mark the anatomical relationship between the low renal artery, the abdominal aortic bifurcation and bony landmarks of vertebral body. According to these data, suitable balloon was chosen and the balloon positioning was guided in the surgery to completely excise tumor assisted by balloon blocking technique. The CTA results showed that the external diameter of aortaventralis and arteria iliaca communis was (1.545 ± 0.248) cm and (1.060 ± 0.205) cm respectively, and the distance between the low renal artery and the abdominal aortic bifurcation was (10.818 ± 1.165) cm. The three-dimensional reconstruction showed that the opening of the low renal artery was mainly located at L1 (16/36, 44.4%) and the abdominal aortic bifurcation mainly located at L4 (22/36, 61.1%). Effective block of abdomial aorta was performed; the blood pressure obviously increased in 3 cases after balloon inflation, and pulse of the left dorsal artery of the foot decreased in 1 case after removal of balloon, which were relieved after expectant treatment. The operation time was 118-311 minutes; the intraoperative blood loss was 200-1800 mL, 21 patients were given blood transfusion, and the amount of blood transfusion was 400-1200 mL; and the aortic clamping time was 40-136 minutes. All patients were followed up 5-44 months

  9. A comparison of intrauterine balloon, intrauterine contraceptive device and hyaluronic acid gel in the prevention of adhesion reformation following hysteroscopic surgery for Asherman syndrome: a cohort study.

    Science.gov (United States)

    Lin, Xiaona; Wei, Minling; Li, T C; Huang, Qiongxiao; Huang, Dong; Zhou, Feng; Zhang, Songying

    2013-10-01

    To compare the efficacy of intrauterine balloon, intrauterine contraceptive device and hyaluronic acid gel in the prevention of the adhesion reformation after hysteroscopic adhesiolysis for Asherman's syndrome. Retrospective cohort study of 107 women with Asherman's syndrome who were treated with hysteroscopic division of intrauterine adhesions. After hysteroscopic adhesiolysis, 20 patients had intrauterine balloon inserted, 28 patients had intrauterine contraceptive device (IUD) fitted, 18 patients had hyaluronic acid gel instilled into the uterine cavity, and 41 control subjects did not have any of the three additional treatment measures. A second-look hysteroscopy was performed in all cases, and the effect of hysteroscopic adhesiolysis was scored by the American Fertility Society classification system. Both the intrauterine balloon group and the IUD group achieved significantly (Pintrauterine balloon or intrauterine device is more effective than the use of hyaluronic acid gel in the prevention of intra-uterine adhesion reformation. Crown Copyright © 2013. Published by Elsevier Ireland Ltd. All rights reserved.

  10. Rectal Balloon for the Immobilization of the Prostate Internal Motion

    International Nuclear Information System (INIS)

    Lee, Sang Kyu; Beak, Jong Geal; Kim, Joo Ho; Jeon, Byong Chul; Cho, Jeong Hee; Kim, Dong Wook; Song, Tae Soo; Cho, Jae Ho; Na, Soo Kyong

    2005-01-01

    The using of endo-rectal balloon has proposed as optimal method that minimized the motion of prostate and the dose of rectum wall volume for treated prostate cancer patients, so we make the customized rectal balloon device. In this study, we analyzed the efficiency of the Self-customized rectal balloon in the aspects of its reproducibility. In 5 patients, for treatment planning, each patient was acquired CT slice images in state of with and without rectal balloon. Also they had CT scanning same repeated third times in during radiation treatment (IMRT). In each case, we analyzed the deviation of rectal balloon position and verified the isodose distribution of rectum wall at closed prostate. Using the rectal balloon, we minimized the planning target volume (PTV) by decreased the internal motion of prostate and overcome the dose limit of radiation therapy in prostate cancer by increased the gap between the rectum wall and high dose region. The using of rectal balloon, although, was reluctant to treat by patients. View a point of immobilization of prostate internal motion and dose escalation of GTV (gross tumor volume), its using consider large efficient for treated prostate cancer patients.

  11. Graph-Based Path-Planning for Titan Balloons

    Science.gov (United States)

    Blackmore, Lars James; Fathpour, Nanaz; Elfes, Alberto

    2010-01-01

    A document describes a graph-based path-planning algorithm for balloons with vertical control authority and little or no horizontal control authority. The balloons are designed to explore celestial bodies with atmospheres, such as Titan, a moon of Saturn. The algorithm discussed enables the balloon to achieve horizontal motion using the local horizontal winds. The approach is novel because it enables the balloons to use arbitrary wind field models. This is in contrast to prior approaches that used highly simplified wind field models, such as linear, or binary, winds. This new approach works by discretizing the space in which the balloon operates, and representing the possible states of the balloon as a graph whose arcs represent the time taken to move from one node to another. The approach works with arbitrary wind fields, by looking up the wind strength and direction at every node in the graph from an arbitrary wind model. Having generated the graph, search techniques such as Dijkstra s algorithm are then used to find the set of vertical actuation commands that takes the balloon from the start to the goal in minimum time. In addition, the set of reachable locations on the moon or planet can be determined.

  12. Ballooning modes or Fourier modes in a toroidal plasma?

    International Nuclear Information System (INIS)

    Connor, J.W.; Taylor, J.B.

    1987-01-01

    The relationship between two different descriptions of eigenmodes in a torus is investigated. In one the eigenmodes are similar to Fourier modes in a cylinder and are highly localized near a particular rational surface. In the other they are the so-called ballooning modes that extend over many rational surfaces. Using a model that represents both drift waves and resistive interchanges the transition from one of these structures to the other is investigated. In this simplified model the transition depends on a single parameter which embodies the competition between toroidal coupling of Fourier modes (which enhances ballooning) and variation in frequency of Fourier modes from one rational surface to another (which diminishes ballooning). As the coupling is increased each Fourier mode acquires a sideband on an adjacent rational surface and these sidebands then expand across the radius to form the extended mode described by the conventional ballooning mode approximation. This analysis shows that the ballooning approximation is appropriate for drift waves in a tokamak but not for resistive interchanges in a pinch. In the latter the conventional ballooning effect is negligible but they may nevertheless show a ballooning feature. This is localized near the same rational surface as the primary Fourier mode and so does not lead to a radially extended structure

  13. A comparative study of high-viscosity cement percutaneous vertebroplasty vs. low-viscosity cement percutaneous kyphoplasty for treatment of osteoporotic vertebral compression fractures.

    Science.gov (United States)

    Sun, Kai; Liu, Yang; Peng, Hao; Tan, Jun-Feng; Zhang, Mi; Zheng, Xian-Nian; Chen, Fang-Zhou; Li, Ming-Hui

    2016-06-01

    The clinical effects of two different methods-high-viscosity cement percutaneous vertebroplasty (PVP) and low-viscosity cement percutaneous kyphoplasty (PKP) in the treatment of osteoporotic vertebral compression fractures (OVCFs) were investigated. From June 2010 to August 2013, 98 cases of OVCFs were included in our study. Forty-six patients underwent high-viscosity PVP and 52 patients underwent low-viscosity PKP. The occurrence of cement leakage was observed. Pain relief and functional activity were evaluated using the Visual Analog Scale (VAS) and Oswestry Disability Index (ODI), respectively. Restoration of the vertebral body height and angle of kyphosis were assessed by comparing preoperative and postoperative measurements of the anterior heights, middle heights and the kyphotic angle of the fractured vertebra. Nine out of the 54 vertebra bodies and 11 out of the 60 vertebra bodies were observed to have cement leakage in the high-viscosity PVP and low-viscosity PKP groups, respectively. The rate of cement leakage, correction of anterior vertebral height and kyphotic angles showed no significant differences between the two groups (P>0.05). Low-viscosity PKP had significant advantage in terms of the restoration of middle vertebral height as compared with the high-viscosity PVP (Pviscosity PVP and low-viscosity PKP have similar clinical effects in terms of the rate of cement leakage, restoration of the anterior vertebral body height, changes of kyphotic angles, functional activity, and pain relief. Low-viscosity PKP is better than high-viscosity PVP in restoring the height of the middle vertebra.

  14. Open-Access Single Balloon Enteroscopy: A Tertiary Care Experience.

    Science.gov (United States)

    Holman, Nathan; Wallace, Kristin; Moore, J Matthew; Brock, Andrew S

    2015-12-01

    To compare single balloon enteroscopy (SBE) between patients seen in consultation by a member of our gastroenterology team with those performed as open-access cases. Retrospective study of all patients who underwent SBE at a single tertiary care center from April 2008 to January 2012. Open- and closed-access procedures were compared in terms of diagnostic and therapeutic yield, adverse events, and procedural success. A total of 125 SBEs were performed on 125 patients. The mean age was 63.1 (53% men) years. In all, 43 procedures were performed open access and 82 after face-to-face consultation. Indications included anemia/gastrointestinal bleeding (110), abdominal pain (8), and other (7). Diagnostic yield for open- and closed-access procedures was 53% and 60%, respectively (P = 0.501) and therapeutic yield was 37% and 52%, respectively (P = 0.11). Overall technical success was 91% with no difference between the groups (P = 0.27). There were no major adverse events in either group. SBE can be performed as an open-access procedure without compromise to safety or diagnostic yield.

  15. N-dependence of ballooning instabilities

    International Nuclear Information System (INIS)

    Dewar, R.L.; Manickam, J.; Grimm, R.C.; Chance, M.S.

    1980-05-01

    The critical β for stability against ideal hydromagnetic internal ballooning modes as a function of toroidal mode number, n, is calculated for two different equilibrium sequences by use of a finite element technique (n less than or equal to 20), and a WKB formalism (n greater than or equal to 5). The agreement between the two methods is good in the overlap region 5 approx.less than or equal to n approx. less than or equal to 20. The WKB formula reduces to the 1/n correction at very high n, but is much more accurate at moderate n. The critical β vs n curves exhibit oscillatory structure at low n, but in both sequences the lower bound on β/sub c/ approx. 5%. For reactor parameters, finite Larmor radius effects are not expected to have a large effect on this β-limitation

  16. Management of intra-aortic balloon pumps.

    Science.gov (United States)

    Webb, Christopher A-J; Weyker, Paul D; Flynn, Brigid C

    2015-06-01

    Intra-aortic balloon pumps (IABPs) continue to be the most widely used cardiac support devices with an annual estimate of 200 000 IABPs placed worldwide. IABPs enhance myocardial function by maximizing oxygen supply and minimizing oxygen demand. The use of IABPs is not without risk, with major vascular injury, ischemia, and infection being the most common complications, especially in high-risk patients. While recent studies have questioned the use of IABPs in patients with cardiogenic shock secondary to myocardial infarction, these studies have limitations making it difficult to formulate definitive conclusions. This review will focus on the mechanisms of counterpulsation, the management of IABPs and the evidence supporting this ventricular support therapy. © The Author(s) 2014.

  17. Influence of Contrast Agent Dilution on Ballon Deflation Time and Visibility During Tracheal Balloon Dilation: A 3D Printed Phantom Study

    International Nuclear Information System (INIS)

    Kim, Min Tae; Park, Jung-Hoon; Shin, Ji Hoon; Kim, Namkug; Kim, Sunghyun Daniel; Tsauo, Jiaywei; Kim, Kun Young; Kim, Guk Bae; Song, Ho-Young

    2017-01-01

    PurposeTo determine the effect of contrast medium dilution during tracheal balloon dilation on balloon deflation time and visibility using a 3-dimensional (3D) printed airway phantom.Materials and MethodsA comparison study to investigate balloon deflation times and image quality was performed using two contrast agents with different viscosities, i.e., iohexol and ioxithalamate, and six contrast dilutions with a 3D printed airway phantom.ResultsCompared to 1:0 concentration, 3:1, 2:1, 1:1, 1:2, and 1:3, contrast/saline ratios resulted in a 46% (56.2 s), 59.8% (73.1 s), 74.9% (91.6 s), 81.7% (99.8 s), and 83.5% (102 s) reduction for iohexol, respectively, and a 51.8% (54.7 s), 63.8% (67.6 s), 74.7% (79.2 s), 80.5% (85.3 s), and 82.4% (87.4 s) reduction for ioxithalamate, respectively, in the mean balloon deflation time, although at the expense of decreased balloon opacity (3.5, 6.9, 11.1, 12.4, and 13.9%, for iohexol, respectively, and 3.2, 6, 9.6, 10.8, and 12.4%, for ioxithalamate, respectively).ConclusionsUse of a lower viscosity contrast agent and higher contrast dilution is considered to be able to reduce balloon deflation times and then simultaneously decrease visualization of balloons. The rapid balloon deflation time is likely to improve the safe performance of interventional procedures.

  18. SU-E-T-281: Reduction of Treatment Times in CyberKnife Prostate SBRT Using a Water Filled Rectal Balloon

    Energy Technology Data Exchange (ETDEWEB)

    Desai, P; Caroprese, B; McKellar, H [East Texas Medical Center, Tyler, TX (United States)

    2014-06-01

    Purpose: To illustrate 25% reduction in CyberKnife prostate SBRT treatment times using a water filled rectal balloon. Methods: We perform prostate SBRT using a 3800cGy in 4 fraction regimen prescribed between 51% 59% iso-dose lines to 95% of PTV using a CyberKnife System. The resultant heterogeneous dosimetry is analogous to HDR dosimetry. Our patients are treated in a feet first supine position to decrease treatment couch sag and also to position the prostate anatomy closer to the robot. CT imaging is performed with a Radiadyne Immobiloc rectal balloon filled with 45-50cc water placed firmly inside the patient's rectum. A treatment plan is developed from this CT study using Multiplan. The patient is treated every other day for 4 days using the rectal balloon for each fraction. Gold fiducials previously implanted inside the prostate are used for tracking by the CyberKnife system. Results: Critical structures comprise the usual GU anatomy of bladder, rectum, urethra, femoral-heads along with emphasis on doses to anterior rectal wall and rectal mucosa. The water filled rectal balloon localizes the rectum, which enables the physician to accurately contour both anterior rectal wall, and rectal mucosa. The balloon also has a gas release valve enabling better patient comfort. Rectum localization enables the CyberKnife system to make fewer corrections resulting in fewer treatment interruptions and time lost to re-adjustment for rectal motion, bowel filling and gas creation. Effective treatment times are reduced by 25% to approximately 45 minutes. Adoption of the balloon has required minimal change to our planning strategy and plan evaluation process. Conclusion: Patient follow-up comparisons show no difference in effectiveness of treatment with and without balloons We conclude that rectal balloons enhance patient comfort and decrease effective treatment times.

  19. Influence of Contrast Agent Dilution on Ballon Deflation Time and Visibility During Tracheal Balloon Dilation: A 3D Printed Phantom Study.

    Science.gov (United States)

    Kim, Min Tae; Park, Jung-Hoon; Shin, Ji Hoon; Kim, Namkug; Kim, Sunghyun Daniel; Tsauo, Jiaywei; Kim, Kun Young; Kim, Guk Bae; Song, Ho-Young

    2017-02-01

    To determine the effect of contrast medium dilution during tracheal balloon dilation on balloon deflation time and visibility using a 3-dimensional (3D) printed airway phantom. A comparison study to investigate balloon deflation times and image quality was performed using two contrast agents with different viscosities, i.e., iohexol and ioxithalamate, and six contrast dilutions with a 3D printed airway phantom. Compared to 1:0 concentration, 3:1, 2:1, 1:1, 1:2, and 1:3, contrast/saline ratios resulted in a 46% (56.2 s), 59.8% (73.1 s), 74.9% (91.6 s), 81.7% (99.8 s), and 83.5% (102 s) reduction for iohexol, respectively, and a 51.8% (54.7 s), 63.8% (67.6 s), 74.7% (79.2 s), 80.5% (85.3 s), and 82.4% (87.4 s) reduction for ioxithalamate, respectively, in the mean balloon deflation time, although at the expense of decreased balloon opacity (3.5, 6.9, 11.1, 12.4, and 13.9%, for iohexol, respectively, and 3.2, 6, 9.6, 10.8, and 12.4%, for ioxithalamate, respectively). Use of a lower viscosity contrast agent and higher contrast dilution is considered to be able to reduce balloon deflation times and then simultaneously decrease visualization of balloons. The rapid balloon deflation time is likely to improve the safe performance of interventional procedures.

  20. Clinical, manometric, and ultrasonographic results of pneumatic balloon dilatation vs. lateral internal sphincterotomy for chronic anal fissure: a prospective, randomized, controlled trial.

    Science.gov (United States)

    Renzi, Adolfo; Izzo, Domenico; Di Sarno, Giandomenico; Talento, Pasquale; Torelli, Francesco; Izzo, Giuseppe; Di Martino, Natale

    2008-01-01

    This prospective, randomized, controlled trial was designed to compare the clinical, functional, and morphologic results of pneumatic balloon dilatation with lateral internal sphincterotomy for the treatment of chronic anal fissure. All patients with symptomatic chronic anal fissure were randomly assigned to pneumatic balloon dilatation or lateral internal sphincterotomy and invited to complete a standardized questionnaire inquiring about their symptoms. Anal ultrasonography and anal manometry were performed before and six months after surgery. A proctologic examination was performed between the fifth and sixth postoperative weeks. Anal continence, scored by using a validated continence grading scale, was evaluated preoperatively at 1 and 6 weeks and at 12 and 24 months. Fifty-three patients, who satisfied selection criteria, were enrolled in the trial. Four patients (7.5 percent) were lost to follow-up. Twenty-four patients (11 males; mean age, 42 +/- 8.2 years) underwent pneumatic balloon dilatation and 25 patients (10 males; mean age, 44 +/- 7.3 years) underwent lateral internal sphincterotomy. Fissure-healing rates were 83.3 percent in the pneumatic balloon dilatation and 92 percent in the lateral internal sphincterotomy group. Recurrent anal fissure was observed in one patient (4 percent) after lateral internal sphincterotomy. At anal manometry, mean resting pressure decrements obtained after pneumatic balloon dilatation and lateral internal sphincterotomy were 30.5 and 34.3 percent, respectively. After pneumatic balloon dilatation, anal ultrasonography did not show any significant sphincter damage. At 24-month follow-up, the incidence of incontinence, irrespective of severity, was 0 percent in the pneumatic balloon dilatation group and 16 percent in the lateral internal sphincterotomy group (P < 0.0001). As lateral internal sphincterotomy, pneumatic balloon dilatation grants a high anal fissure-healing rate but with a statistically significant reduction in

  1. Influence of Contrast Agent Dilution on Ballon Deflation Time and Visibility During Tracheal Balloon Dilation: A 3D Printed Phantom Study

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Min Tae; Park, Jung-Hoon; Shin, Ji Hoon, E-mail: jhshin@amc.seoul.kr; Kim, Namkug, E-mail: namkugkim@gmail.com [University of Ulsan College of Medicine, Departments of Radiology and Research Institute of Radiology, Asan Medical Center (Korea, Republic of); Kim, Sunghyun Daniel [Seoul National University College of Medicine (Korea, Republic of); Tsauo, Jiaywei; Kim, Kun Young [University of Ulsan College of Medicine, Departments of Radiology and Research Institute of Radiology, Asan Medical Center (Korea, Republic of); Kim, Guk Bae [University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Medical Center (Korea, Republic of); Song, Ho-Young [University of Ulsan College of Medicine, Departments of Radiology and Research Institute of Radiology, Asan Medical Center (Korea, Republic of)

    2017-02-15

    PurposeTo determine the effect of contrast medium dilution during tracheal balloon dilation on balloon deflation time and visibility using a 3-dimensional (3D) printed airway phantom.Materials and MethodsA comparison study to investigate balloon deflation times and image quality was performed using two contrast agents with different viscosities, i.e., iohexol and ioxithalamate, and six contrast dilutions with a 3D printed airway phantom.ResultsCompared to 1:0 concentration, 3:1, 2:1, 1:1, 1:2, and 1:3, contrast/saline ratios resulted in a 46% (56.2 s), 59.8% (73.1 s), 74.9% (91.6 s), 81.7% (99.8 s), and 83.5% (102 s) reduction for iohexol, respectively, and a 51.8% (54.7 s), 63.8% (67.6 s), 74.7% (79.2 s), 80.5% (85.3 s), and 82.4% (87.4 s) reduction for ioxithalamate, respectively, in the mean balloon deflation time, although at the expense of decreased balloon opacity (3.5, 6.9, 11.1, 12.4, and 13.9%, for iohexol, respectively, and 3.2, 6, 9.6, 10.8, and 12.4%, for ioxithalamate, respectively).ConclusionsUse of a lower viscosity contrast agent and higher contrast dilution is considered to be able to reduce balloon deflation times and then simultaneously decrease visualization of balloons. The rapid balloon deflation time is likely to improve the safe performance of interventional procedures.

  2. Intragastric balloon for morbid obesity causing chronic gastric dilatation

    International Nuclear Information System (INIS)

    Pretolesi, F.; Derchi, L.E.; Redaelli, G.; Papagni, L.

    2001-01-01

    We describe the radiographic findings observed in a morbidly obese and diabetic patient with an intragastric air-filled balloon introduced as a therapeutic measure to reduce food intake. The balloon was associated with chronic gastric dilatation and had to be removed 3 months after insertion. However, together with diet and behavioural therapy, it proved effective in reducing body weight and ameliorating glycaemic control. Although rarely used, intragastric balloons for the treatment of morbid obesity are still encountered in radiological practice. Radiologists must be able to recognize them and to understand their complications. (orig.)

  3. Intragastric balloon for morbid obesity causing chronic gastric dilatation

    Energy Technology Data Exchange (ETDEWEB)

    Pretolesi, F.; Derchi, L.E. [Dept. of Radiology, University of Genoa (Italy); Redaelli, G.; Papagni, L. [IRCCS, Ist. Auxologico Italiano, Milan (Italy)

    2001-04-01

    We describe the radiographic findings observed in a morbidly obese and diabetic patient with an intragastric air-filled balloon introduced as a therapeutic measure to reduce food intake. The balloon was associated with chronic gastric dilatation and had to be removed 3 months after insertion. However, together with diet and behavioural therapy, it proved effective in reducing body weight and ameliorating glycaemic control. Although rarely used, intragastric balloons for the treatment of morbid obesity are still encountered in radiological practice. Radiologists must be able to recognize them and to understand their complications. (orig.)

  4. [BALLOON DILATATION IN COMBINATION WITH A DOSED PAPILLOTOMY IN THE TREATMENT OF DIFFICULT FORMS OF CHOLEDOCHOLITHIASIS].

    Science.gov (United States)

    Shapovalova, E I; Grubnik, V V; Tkachenko, A I; Gerasimov, D V; Romak, R P

    2016-04-01

    Results of treatment was studied in 2008 - 2015 yrs in 57 patients, suffering "difficult stones" (choledocholithiasis), in whom a dosed papillotomy in combination with the balloon dilatation. The advantages of application of combined dosed endoscopic papillosphincterotomy and balloon dilatation, comparing with complete endoscopic papillosphincterotomy, while treating "difficult stones" of common biliary duct, were established. Application of the procedure have guaranteed a good access through the duodenal papilla magna and have permitted to perform the calculi extraction in a less traumatic way, what have promoted its function preservation, and reduction of a postoperative complications rate, the patients' stationary treatment duration, and the remote complications rate. Using questionnaire SF-36, the quality of life was analyzed in patients, in whom in remote period the duodenal papilla magna function was preserved.

  5. Development of a New Coaxial Balloon Catheter System for Balloon-Occluded Retrograde Transvenous Obliteration (B-RTO)

    International Nuclear Information System (INIS)

    Tanoue, Shuichi; Kiyosue, Hiro; Matsumoto, Shunro; Hori, Yuzo; Okahara, Mika; Kashiwagi, Junji; Mori, Hiromu

    2006-01-01

    Purpose. To develop a new coaxial balloon catheter system and evaluate its clinical feasibility for balloon-occluded retrograde transvenous obliteration (B-RTO). Methods. A coaxial balloon catheter system was constructed with 9 Fr guiding balloon catheter and 5 Fr balloon catheter. A 5 Fr catheter has a high flexibility and can be coaxially inserted into the guiding catheter in advance. The catheter balloons are made of natural rubber and can be inflated to 2 cm (guiding) and 1 cm (5 Fr) maximum diameter. Between July 2003 and April 2005, 8 consecutive patients (6 men, 2 women; age range 33-72 years, mean age 55.5 years) underwent B-RTO using the balloon catheter system. Five percent ethanolamine oleate iopamidol (EOI) was used as sclerosing agent. The procedures, including maneuverability of the catheter, amount of injected sclerosing agent, necessity for coil embolization of collateral draining veins, and initial clinical results, were evaluated retrospectively. The occlusion rate was assessed by postcontrast CT within 2 weeks after B-RTO. Results. The balloon catheter could be advanced into the proximal potion of the gastrorenal shunt beyond the collateral draining vein in all cases. The amount of injected EOI ranged from 3 to 34 ml. Coil embolization of the collateral draining vein was required in 2 cases. Complete obliteration of gastric varices on initial follow-up CT was obtained in 7 cases. The remaining case required re-treatment that resulted in complete obstruction of the varices after the second B-RTO. No procedure-related complications were observed. Conclusion. B-RTO using the new coaxial balloon catheter is feasible. Gastric varices can be treated more simply by using this catheter system

  6. Systematic review and meta-analysis of balloon angioplasty versus primary stenting in the infrapopliteal disease.

    Science.gov (United States)

    Yang, Xinrui; Lu, Xinwu; Ye, Kaichuang; Li, Xiangxiang; Qin, Jinbao; Jiang, Mier

    2014-01-01

    We performed a systematic review and meta-analysis of comparing balloon angioplasty and primary stenting for symptomatic infrapopliteal disease to evaluate the clinical value of primary stenting in treating infrapopliteal diseases. Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines were followed. PubMed (1984-present), ScienceDirect (1980-present), Embase (1990-present), and CBM (1988-present) databases were searched for relevant articles. Finally, 16 studies (published between 2001 and 2013) satisfying the inclusion criteria were identified. The outcome parameters were immediate technical success, 1-year primary patency rate, 1-year limb salvage rate, and 1-year target vessel revascularization (TVR)-free rate. Comparisons were made with balloon angioplasty and primary stenting, and based on the different types of stents, we divided the primary stent group into the bare metal stent (BMS) group and drug-eluting stent (DES) group. A total of 3789 patients and 4339 limbs constituted our final study population. The technical success rate of balloon angioplasty was 92.29% (95% confidence interval [CI] 88.75%-94.78%). Only 2 study reported the technical failure rates as 4% and 5.2% in the primary stent group. The pooled estimates of 1-year primary patency and TVR-free rate were similarly low in the balloon angioplasty group and BMS group (primary patency: 57.65%, 95% CI 53.54%-61.67% vs 60.95%, 95% CI 48.31%-72.28%, P = .38; TVR-free rate: 73.41%, 95% CI 66.51%-80.08% vs 73.66%, 95% CI 63.58%-81.75%, P = .91). The pooled estimates of 1-year primary patency and TVR-free rate in DES group were 81.10% (95% CI 75.48%-85.67%) and 90.30% (95% CI 85.30%-93.73%), respectively, which were better than those of the BMS and balloon angioplasty groups (P DES groups was 88.61% (95% CI 85.01%-91.43%), 94.41% (95% CI 89.52%-97.1%), and 95.20% (95% CI 86.97%-98.33%), respectively (P DES groups had higher limb salvage rates than the balloon angioplasty

  7. Endoscopic papillary balloon dilation for a 7-year-old girl with choledocholithiasis.

    Science.gov (United States)

    Sogo, Tsuyoshi; Kondo, Takeo; Tsunoda, Tomoyuki; Murayama, Akitoshi; Komatsu, Haruki; Inui, Ayano; Fujisawa, Tomoo

    2013-04-01

    A 7-year-old girl was referred to our hospital for severe abdominal pain and elevated serum levels of amylase and aminotransferase. Radiological examinations revealed choledocholithiasis. EPBD was performed under intravenous anesthesia using midazolam and ketamine chloride. After fluoroscopic confirmation of a bile duct stone, a dilation balloon (30 mm-long, 8 mm-diameter) was passed over the guidewire and placed across the papilla. The balloon was gradually inflated until the notch created by the papillary sphincter disappeared. At 4 atm, the notch disappeared and the pressure was maintained for 15 s. Stone extraction was performed by using a retrieval balloon catheter. Abdominal pain disappeared immediately after EPBD, and she resumed oral intake 2 days after EPBD. In conclusion, EPBD may be a safe and effective technique for the treatment of choledocholithiasis in pediatric patients. EPDB should be selected as a treatment for pediatric choledocholithiasis in view of its advantages of preserving papillary function. © 2013 The Authors. Pediatrics International © 2013 Japan Pediatric Society.

  8. Prophylactic Hypogastric Artery Ballooning in a Patient with Complete Placenta Previa and Increta

    Science.gov (United States)

    Yi, Kyong Wook; Seo, Tae-Seok; So, Kyeong A; Paek, Yu Chin; Kim, Hai-Joong

    2010-01-01

    Abnormal attachment of the placenta (Placenta accreta, increta, and percreta) is an uncommon but potentially lethal cause of maternal mortality from massive postpartum hemorrhage. A 33-yr-old woman, who had been diagnosed with a placenta previa, was referred at 30 weeks gestation. On ultrasound, a complete type of placenta previa and multiple intraplacental lacunae, suggestive of placenta accreta, were noted. For further evaluation of the placenta, pelvis MRI was performed and revealed findings suspicious of a placenta increta. An elective cesarean delivery and subsequent hysterectomy were planned for the patient at 38 weeks gestation. On the day of delivery, endovascular catheters for balloon occlusion were placed within the hypogastric arteries, prior to the cesarean section. In the operating room, immediately after the delivery of the baby, bilateral hypogastric arteries were occluded by inflation of the balloons in the catheters previously placed within. With the placenta retained within the uterus, a total hysterectomy was performed in the usual fashion. The occluding balloons were deflated after closure of the vaginal cuff with hemostasis. The patient had stable vital signs and normal laboratory findings during the recovery period; she was discharged six days after delivery without complications. The final pathology confirmed a placenta increta. PMID:20358016

  9. Clinical experience of cerebral protection with balloon occlusion during carotid artery stenting

    International Nuclear Information System (INIS)

    Jaeger, H.J.; Mathias, K.D.; Drescher, R.; Bockisch, G.; Hauth, E.; Demirel, E.; Gissler, H.M.; Witten/Herdecke Univ.

    2001-01-01

    Purpose: To asses the technical feasibility and the results of cerebral protection with the GuardWire Plus Temporary Occlusion and Aspiration System during carotid artery stenting for high-grade stenosis. Patients and Methods: In 20 patients 20 carotid artery stenoses were treated with stent placement under cerebral protection. A contralateral carotid occlusion was an exclusion criteria for the use of the protection device. In all cases only aspiration, but no flushing was used before deflation of the occlusion balloon. In 17 of 20 patients diffusion-weighted (DW-)MRT imaging of the brain was performed before and 24 hours after the procedure. Results: The stent implantation was successfully performed in all patients. In 3 patients neurologic symptoms occurred during the occlusion time. In these 3 patients the symptoms immediately disappeared after deflation of the balloon. In one case there was dilatation of the internal carotid artery at the site of the balloon inflation. In 3 of the 17 DW-MR images new ipsilateral cerebral lesions, in one case a new contralateral lesion occurred after the procedure. Conclusions: The cerebral protection procedure is technically feasible. The occlusion of the internal carotid artery was not tolerated by all patients. The DW-MR imaging demonstrated cerebral lesions indicating the occurrence of cerebral microemboli during the procedure. Further investigations are necessary to determine if the use of the cerebral protection device will improve the results of the carotid artery stenting for high-grade stenoses. (orig.) [de

  10. Sequential Structural and Fluid Dynamics Analysis of Balloon-Expandable Coronary Stents: A Multivariable Statistical Analysis.

    Science.gov (United States)

    Martin, David; Boyle, Fergal

    2015-09-01

    Several clinical studies have identified a strong correlation between neointimal hyperplasia following coronary stent deployment and both stent-induced arterial injury and altered vessel hemodynamics. As such, the sequential structural and fluid dynamics analysis of balloon-expandable stent deployment should provide a comprehensive indication of stent performance. Despite this observation, very few numerical studies of balloon-expandable coronary stents have considered both the mechanical and hemodynamic impact of stent deployment. Furthermore, in the few studies that have considered both phenomena, only a small number of stents have been considered. In this study, a sequential structural and fluid dynamics analysis methodology was employed to compare both the mechanical and hemodynamic impact of six balloon-expandable coronary stents. To investigate the relationship between stent design and performance, several common stent design properties were then identified and the dependence between these properties and both the mechanical and hemodynamic variables of interest was evaluated using statistical measures of correlation. Following the completion of the numerical analyses, stent strut thickness was identified as the only common design property that demonstrated a strong dependence with either the mean equivalent stress predicted in the artery wall or the mean relative residence time predicted on the luminal surface of the artery. These results corroborate the findings of the large-scale ISAR-STEREO clinical studies and highlight the crucial role of strut thickness in coronary stent design. The sequential structural and fluid dynamics analysis methodology and the multivariable statistical treatment of the results described in this study should prove useful in the design of future balloon-expandable coronary stents.

  11. 14 CFR 31.17 - Performance: Climb.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Performance: Climb. 31.17 Section 31.17 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: MANNED FREE BALLOONS Flight Requirements § 31.17 Performance: Climb. (a) Each balloon must be...

  12. Evaluation of the Distribution of Paclitaxel After Application of a Paclitaxel-Coated Balloon in the Rabbit Urethra.

    Science.gov (United States)

    Barbalias, Dimitrios; Lappas, Georgios; Ravazoula, Panagiotia; Liourdi, Despoina; Kyriazis, Iason; Liatsikos, Evangelos; Kallidonis, Panagiotis

    2018-03-02

    Urethral strictures are a common urologic problem that could require complex reconstructive procedures. Urethral dilatation represents a frequent practiced intervention associated with high recurrence rates. Drug-coated percutaneous angioplasty balloons (DCBs) with cytostatic drugs have been effectively used for the prevention of vascular restenosis after balloon dilatation. To reduce restenosis rates of urethral dilatation, these balloons could be used in the urethra. Nevertheless, the urothelium is different than the endothelium and these drugs may not be distributed to the outer layers of the urethra. Thus, an experiment was performed to evaluate the distribution of paclitaxel (PTX) in the rabbit urethra after the inflation of a PTX-coated balloon (PCB). Eleven rabbits underwent dilatation of the posterior urethra with common endoscopic balloons after urethrography. Nine of these rabbits were additionally treated with PCB. The urethras of the two control animals were removed along with three more dilated with PCB urethras immediately after the dilatation. The remaining of the urethras were removed after 24 (n = 3) and 48 hours (n = 3). The posterior segments of the urethras were evaluated with hematoxylin and eosin staining as well as with immunohistochemistry with polyclonal anti-PTX antibody. The two control specimens showed denudation of the urothelium after balloon dilatations and no PTX was observed. All specimens from dilated PCB urethras showed distribution of PTX to all layers of the urethra. The specimens that were immediately removed exhibited denudation of the urothelium without any inflammation. The specimens removed at 24 and 48 hours showed mild acute inflammation. PTX was distributed to the urothelial, submucosal, and smooth muscle layers of the normal rabbit urethra immediately after dilatation with a DCB. PTX and mild inflammation were present at the site 24 and 48 hours after the dilatation.

  13. OCT evaluation of directional atherectomy compared to balloon angioplasty

    Energy Technology Data Exchange (ETDEWEB)

    Marmagkiolis, Konstantinos [Citizens Memorial Hospital Heart and Vascular Institute, Bolivar, MO (United States); Lendel, Vasili [Arkansas Heart Hospital, Peripheral Vascular Institute, Little Rock, AR (United States); Cilingiroglu, Mehmet, E-mail: mcilingiroglu@yahoo.com [Arkansas Heart Hospital, Peripheral Vascular Institute, Little Rock, AR (United States); Koc University, School of Medicine, Istanbul (Turkey)

    2015-09-15

    Directional atherectomy (DA) is one of the most commonly used modalities for the treatment of obstructive femoropopliteal peripheral arterial disease (PAD), especially in patients with large and calcified atherosclerotic plaques. The effect of directional atherectomy to the vascular wall compared to balloon angioplasty by optical coherence tomography (OCT) has not been previously described. We present the first case of OCT after directional atherectomy with SilverHawk followed by angiosculpt balloon angioplasty. - Highlights: • Directional atherectomy avoids the vascular mechanical damage caused by angioplasty balloons and the exposure of stent struts or the potential of stent fracture with stents. • OCT can accurately assess the effect of endovacular interventions to the vessel wall. • Although angiographic results after directional atherectomy are acceptable, OCT use demonstrated suboptimal improvement of the MLA requiring additional balloon angioplasty. • Longer studies are needed to define whether the improved OCT results with angioplasty compared to DA may offer better clinical outcomes.

  14. Remote sensing and sensor testing via hot air balloons

    Energy Technology Data Exchange (ETDEWEB)

    Watson, S.M. [Univ. of Utah, Salt Lake City, UT (United States); Kroutil, R.T. [Army Edgewood Research, Development and Engineering Center, Aberdeen Proving Ground, MD (United States); Traynor, C.A. [DARPA High Performance Computing Applications, Arlington, VA (United States)] [and others

    1996-11-01

    Tethered and free-flying manned hot air balloons have been demonstrated as platforms for various remote sensing asks and sensor testing and atmospheric measurements. These platforms are inexpensive to operate, do not cause atmospheric disturbances as do higher speed platforms, and are extremely stable and free of vibrations inherent in aircraft structures. The equipment operated and tested on the balloons in connection with this project includes a prototype multispectral imaging spectrometer, high resolution CCD cameras, mid- and far-infrared cameras, a radiometer, FTIR spectrometers, video recording equipment and portable power generators carried beneath the balloon providing power to the equipment The experiments conducted on and from the balloon include chemical effluents characterization, atmospheric propagation through slant paths, obscurants imaging and scene reflectance. 7 refs.

  15. Stabilization of ballooning modes with sheared toroidal rotation

    International Nuclear Information System (INIS)

    Miller, R.L.; Waelbroeck, F.L.; Hassam, A.B.; Waltz, R.E.

    1995-01-01

    Stabilization of magnetohydrodynamic ballooning modes by sheared toroidal rotation is demonstrated using a shifted circle equilibrium model. A generalized ballooning mode representation is used to eliminate the fast Alfven wave, and an initial value code solves the resulting equations. The s-α diagram (magnetic shear versus pressure gradient) of ballooning mode theory is extended to include rotational shear. In the ballooning representation, the modes shift periodically along the field line to the next point of unfavorable curvature. The shift frequency (dΩ/dq, where Ω is the angular toroidal velocity and q is the safety factor) is proportional to the rotation shear and inversely proportional to the magnetic shear. Stability improves with increasing shift frequency and direct stable access to the second stability regime occurs when this frequency is approximately one-quarter to one-half the Alfven frequency, ω A =V A /qR. copyright 1995 American Institute of Physics

  16. SMEX02 Balloon-borne Radiosonde Data, Iowa, Version 1

    Data.gov (United States)

    National Aeronautics and Space Administration — This data set includes radiosonde measurements of upper air temperature and pressure, relative humidity, and wind direction and speed during the balloons' ascent to...

  17. Design Evolution and Methodology for Pumpkin Super-Pressure Balloons

    Science.gov (United States)

    Farley, Rodger

    The NASA Ultra Long Duration Balloon (ULDB) program has had many technical development issues discovered and solved along its road to success as a new vehicle. It has the promise of being a sub-satellite, a means to launch up to 2700 kg to 33.5 km altitude for 100 days from a comfortable mid-latitude launch point. Current high-lift long duration ballooning is accomplished out of Antarctica with zero-pressure balloons, which cannot cope with the rigors of diurnal cycles. The ULDB design is still evolving, the product of intense analytical effort, scaled testing, improved manufacturing, and engineering intuition. The past technical problems, in particular the s-cleft deformation, their solutions, future challenges, and the methodology of pumpkin balloon design will generally be described.

  18. A battery-operated pilot balloon time-signal generator

    Science.gov (United States)

    Ralph H. Moltzau

    1966-01-01

    Describes the design and construction of a 1-pound, battery-operated, time-signal transmitter, which is usable with portable radio or field telephone circuits for synchronizing multi-theodolite observation of pilot balloons.

  19. Ballooning stability analysis of JET H-mode discharges

    International Nuclear Information System (INIS)

    O'Brien, D.P.; Galvao, R.; Keilhacker, M.; Lazzaro, E.; Watkins, M.L.

    1989-01-01

    Previous studies of the stability of a large aspect ratio model equilibrium to ideal MHD ballooning modes have shown that across the bulk of the plasma there exist two marginally stable values of the pressure gradient parameter α. These define an unstable zone which separates the first (small α) stable region from the second (large α) stable region. Close to the separatrix, however, the first and second regions can coalesce when the surface averaged current density, Λ, exceeds a critical value. The plasma in this region is then stable to ballooning modes at all values of the pressure gradient. In this paper we extend these results to JET H-mode equilibria using a finite aspect ratio ballooning formalism, and assess the relevance of ideal ballooning stability in these discharges. In particular we analyse shot 15894 at time 56 sec. which is 1.3 s into the H-phase. (author) 4 refs., 4 figs

  20. 10 meter Sub-Orbital Large Balloon Reflector (LBR)

    Data.gov (United States)

    National Aeronautics and Space Administration — This is the lead NIAC Phase II proposal for “10 meter Sub-Orbital Large Balloon Reflector (LBR)” with Christopher K. Walker as PI. We propose to develop and...

  1. SMEX02 Balloon-borne Radiosonde Data, Iowa

    Data.gov (United States)

    National Aeronautics and Space Administration — This data set includes radiosonde measurements of upper air temperature and pressure, relative humidity, and wind direction and speed during the balloons' ascent to...

  2. Ideal ballooning stability near an equilibrium magnetic island

    Energy Technology Data Exchange (ETDEWEB)

    Hegna, C.C.; Callen, J.D.

    1992-03-01

    The stability properties of ideal ballooning modes on toroidal flux surfaces near a quasistatic magnetic island is examined. On these surfaces, magnetic field-line trajectories tend to bunch on that part of the magnetic surface closet to the X-point of the magnetic island. Because of this preferential bunching, the stabilizing effect of field-line bending due to magnetic shear can be reduced. Eigenfunctions localized in helical angle near the X-point and in poloidal angle on the bad curvature side of the tokamak are more susceptible to ballooning instability than are modes in corresponding equilibria without the magnetic island. For a slowly growing island, a growing number of flux surfaces located near the separatrix become ballooning unstable. Secondary ballooning instabilities may play a part in the crash phase of sawteeth or macroscopic island dynamics.

  3. Permanent endovascular balloon occlusion of the vertebral artery as an adjunct to the surgical resection of selected cervical spine tumors: A single center experience.

    Science.gov (United States)

    Ogungbemi, Ayokunle; Elwell, Vivien; Choi, David; Robertson, Fergus

    2015-08-01

    Complete surgical resection of cervical spine tumors is often challenging when there is tumor encasement of major neck vessels. Pre-operative endovascular sacrifice of the major vessels can facilitate safe tumor resection. The use of transarterial detachable coils has been described in this setting, but it can be time-consuming and costly to occlude a patent parent vessel using this method. Our aim was to evaluate the safety and effectiveness of our endovascular detachable balloon occlusion technique, performed without prior balloon test occlusion in the pre-operative management of these tumors. We retrospectively reviewed 18 consecutive patients undergoing pre-operative unilateral permanent endovascular balloon occlusion of tumor-encased vertebral arteries in our institution. Procedure-related ischemic or thromboembolic complication was defined as focal neurologic deficit attributable to the endovascular occlusion which occurs before subsequent surgical resection. Successful pre-operative endovascular vertebral artery sacrifice using detachable balloons was achieved in 100% (n = 18) of cases without prior balloon test occlusion. Procedural complication rate was 5.6% as one patient developed transient focal neurology secondary to a delayed cerebellar infarct at home on day 11 and subsequently made a full recovery. There were no cases of distal balloon migration. Complete macroscopic resection of tumor as reported by the operating surgeon was achieved in 89% of cases. Pre-operative endovascular sacrifice of the vertebral artery using detachable balloons and without prior balloon test occlusion is a safe procedure with low complication rates and good surgeon reported rates of total resection. © The Author(s) 2015.

  4. Properties of ballooning modes in the Heliotron configurations

    International Nuclear Information System (INIS)

    Nakajima, N.; Hudson, S.R.; Hegna, C.C.

    2005-01-01

    The stability of ballooning modes is influenced by the local and global magnetic shear and local and global magnetic curvature so significantly that it is fairly difficult to get those general properties in the three dimensional configurations with strong flexibility due to the external coil system. In the case of the planar axis heliotron configurations allowing a large Shafranov shift, like LHD, properties of the high-mode-number ballooning modes have been intensively investigated. It has been analytically shown that the local magnetic shear comes to disappear in the stellarator-like global magnetic shear region, as the Shafranov shift becomes large. Based on this mechanism and the characteristics of the local and global magnetic curvature, it is numerically shown that the destabilized ballooning modes have strong three-dimensional properties (both poloidal and toroidal mode couplings) in the Mercier stable region, and that those are fairly similar to ballooning modes in the axisymmetric system in the Mercier unstable region. As is well known, however, no quantization condition is applicable to the ballooning modes in the three-dimensional system without symmetry, and so the results of the high-mode-number ballooning modes in the covering space had to be confirmed in the real space. Such a confirmation has been done in the Mercier stable region and also in the Mercier unstable region by using three dimensional linearized ideal MHD stability code cas3d. Confirming the relation between high-mode-number ballooning analyses by the global mode analyses, the method of the equilibrium profile variations has been developed in the tree dimensional system, giving dt/dψ - dP/dψ stability diagram corresponding to the s - α diagram in tokamaks. This method of profile variation are very powerful to investigate the second stability of high-mode-number ballooning modes and has been more developed. Recently it has been applied to the plasma in the inward-shifted LHD

  5. The Evaluation of Endoscopic Balloon Dilation Treatment for Benign

    Directory of Open Access Journals (Sweden)

    H. Ghofrani

    2008-04-01

    Full Text Available Background and ObjectiveBalloon dilatation of stricture is one of the new treatment methods for patients with Gastric Outlet Obstruction (GOO. Prevalence and underlying etiologies of GOO in various populations are different. The goal of the present study was to determine the effectiveness of endoscopic balloon dilatation and factors that could affect method advantage among patients with benign etiology for GOO. Methods Forty-five patients with symptoms of benign GOO were randomly selected. The mean age of patients was 43.7±18.1 years and 86.7% of them were men. Gastric outlet was delineated using double channel videoendoscopy. The severity of gastric pain was measured by VAS test immediately before and one month after balloon dilatation. Patients were followed after procedure weekly (for the first month and then monthly. Balloon dilatation was repeated for 27% patients during the follow up period.ResultsPatients were followed for 9.9±5.8 months. Furthermore, 71.1% were H. pylori positive. Positive response percent to endoscopic balloon dilatation was 80% and eight patients were took under surgical resection. Weight loss was seen frequently in the non-respondent group. The pain severity was significantly reduced in respondent subjects. No meaningful correlations were found between the response to balloon dilatation and positive H. pylori and cigarette smoking.ConclusionEndoscopic balloon dilatation is a safe and effective method for treating most of patients with benign gastric outlet obstruction and has favorable long-term outcome. Keywords: Endoscopy, Gastric Outlet Obstruction (GOO, Balloon Dilatation

  6. Design optimization of stent and its dilatation balloon using kriging surrogate model.

    Science.gov (United States)

    Li, Hongxia; Liu, Tao; Wang, Minjie; Zhao, Danyang; Qiao, Aike; Wang, Xue; Gu, Junfeng; Li, Zheng; Zhu, Bao

    2017-01-11

    Although stents have great success of treating cardiovascular disease, it actually undermined by the in-stent restenosis and their long-term fatigue failure. The geometry of stent affects its service performance and ultimately affects its fatigue life. Besides, improper length of balloon leads to transient mechanical injury to the vessel wall and in-stent restenosis. Conventional optimization method of stent and its dilatation balloon by comparing several designs and choosing the best one as the optimal design cannot find the global optimal design in the design space. In this study, an adaptive optimization method based on Kriging surrogate model was proposed to optimize the structure of stent and the length of stent dilatation balloon so as to prolong stent service life and improve the performance of stent. A finite element simulation based optimization method combing with Kriging surrogate model is proposed to optimize geometries of stent and length of stent dilatation balloon step by step. Kriging surrogate model coupled with design of experiment method is employed to construct the approximate functional relationship between optimization objectives and design variables. Modified rectangular grid is used to select initial training samples in the design space. Expected improvement function is used to balance the local and global searches to find the global optimal result. Finite element method is adopted to simulate the free expansion of balloon-expandable stent and the expansion of stent in stenotic artery. The well-known Goodman diagram was used for the fatigue life prediction of stent, while dogboning effect was used for stent expansion performance measurement. As the real design cases, diamond-shaped stent and sv-shaped stent were studied to demonstrate how the proposed method can be harnessed to design and refine stent fatigue life and expansion performance computationally. The fatigue life and expansion performance of both the diamond-shaped stent and sv

  7. Ballooning Stability of the Compact Quasiaxially Symmetric Stellarator

    International Nuclear Information System (INIS)

    Redi, M.H.; Canik, J.; Dewar, R.L.; Johnson, J.L.; Klasky, S.; Cooper, W.A.; Kerbichler, W.

    2001-01-01

    The magnetohydrodynamic (MHD) ballooning stability of a compact, quasiaxially symmetric stellarator (QAS), expected to achieve good stability and particle confinement is examined with a method that can lead to estimates of global stability. Making use of fully 3D, ideal-MHD stability codes, the QAS beta is predicted to be limited above 4% by ballooning and high-n kink modes. Here MHD stability is analyzed through the calculation and examination of the ballooning mode eigenvalue isosurfaces in the 3-space [s, alpha, theta(subscript ''k'')]; s is the edge normalized toroidal flux, alpha is the field line variable, and theta(subscript ''k'') is the perpendicular wave vector or ballooning parameter. Broken symmetry, i.e., deviations from axisymmetry, in the stellarator magnetic field geometry causes localization of the ballooning mode eigenfunction, with new types of nonsymmetric, eigenvalue isosurfaces in both the stable and unstable spectrum. The isosurfaces around the most unstable points i n parameter space (well above marginal) are topologically spherical. In such cases, attempts to use ray tracing to construct global ballooning modes lead to a k-space runaway. Introduction of a reflecting cutoff in k(perpendicular) to model numerical truncation or finite Larmor radius (FLR) yields chaotic ray paths ergodically filling the allowed phase space, indicating that the global spectrum must be described using the language of quantum chaos theory. However, the isosurface for marginal stability in the cases studied are found to have a more complex topology, making estimation of FLR stabilization more difficult

  8. Preliminary experiment with a newly developed double balloon, double lumen catheter for extracorporeal life support vascular access.

    Science.gov (United States)

    Okamoto, Taisuke; Ichinose, Keisuke; Tanimoto, Hironari; Yoshitake, Atsushi; Sakanashi, Yuji; Tashiro, Masafumi; Terasaki, Hidenori

    2003-01-01

    Recently, venovenous extracorporeal life support (VVECLS) using a double lumen catheter has been clinically used to avoid neurologic complications in the treatment of respiratory failure for neonates. However, recirculation, which is a limiting factor for oxygen delivery, still exists, and thus it does not contribute to oxygenation of the patient. We developed a newly designed double lumen catheter with a double balloon (DBDL) catheter for ECLS vascular access and performed two animal preliminary experiments in normal and hypoxic dog models (normal ventilation and one lung ventilation experiments) to investigate whether the DBDL catheter could prevent recirculation and maintain oxygen delivery to systemic circulation. The DBDL catheter (JCT Co., Hiroshima, Japan) of 15 Fr was fabricated from silicone. It consists of two lumens for drainage and return of blood with two balloons (distal and proximal balloons) that prevent oxygenated blood mixing with unoxygenated blood. VVECLS using a DBDL catheter was performed in 13 mongrel dogs (8 dogs for normal ventilation experiment weighing 12.9 +/- 1.6 kg [mean +/- SD], 5 dogs for one lung ventilation experiment weighing 16.6 +/- 2.5 kg [mean +/- SD]) under anesthesia in the two experiments. The bypass flow ranged from 10-40 ml/kg per minute in the normal ventilation experiment. VVECLS in the one lung ventilation experiment was performed with maximal bypass flow for 6 hours (ranged from 25.2 +/- 8.0-28.3 +/- 8.7 ml/kg per minute at balloon inflation and deflation). Recirculation and oxygen transfer of artificial lung with or without balloon inflation during VVECLS were studied. Recirculation decreased with balloon inflation at varied bypass flows during VVECLS in the normal ventilation experiment (varied from 1.5 +/- 14.6-12.8 +/- 16.7%) and for 6 hours after VVECLS initiation in the one lung ventilation experiment (varied from 12.2 +/- 12.2-19.2 +/- 6.5%). In particular, the values at 3 and 6 hours were significantly lower

  9. [Active management of postpartum hemorrhage and Bakri balloon placement in primiparous and multiparous].

    Science.gov (United States)

    Cruz-Cruz, D; Peña-Dehesa, H; Cérbulo-Vázquez, A; Guzmán-López, M

    2016-05-01

    To evaluate the usefulness of active management of the third stage of labor plus Bakri balloon in primiparous and multiparous. patients with postpartum hemorrhage. MATERIAL AND MET HOD: A retrospective, cross-sectional analytical study in the Hospital of Women, from 1st January 2013 to 31st December 2014. We use uterotonics and after persistence of postpartum hemorrhage also considered Bakri balloon placement, and further transfusion management were evaluated. Analysis descriptive and inferential statistics were performed (Mann-Whitney U and linear regression) and the relationship between inter- and intra-group variables analyzed, a significance level of p <0.05 was established. We choice 47 patients (26 primiparous and 21 multiparous). The 100% of cases avoids obstetric hysterectomy, average age was lower in primiparous than multiparous (p <0.05). Both groups required transfusion of blood products at similar. The relationship between days of hospitalization vs bleeding volume was directly proportional to primiparous, but inversely proportional to the multiparous (p <0.05), the analysis for combinations of uterotonics in the management of post-partum hemorrhage, shown that misoprostol (800 mg, rectally) stressed this relationship in primiparous while effect disappears in multiparous. The Bakri balloon placement decreases the number of fatalities and hysterectomies in obstetric patients in both primiparous and multiparous with postpartum hemorrhage that does not response to the treatment with .uterotonic drugs.

  10. Influence of Equilibrium Perpendicular Shear Flow on Peeling-ballooning Instabilities

    Science.gov (United States)

    Xi, P. W.; Xu, X. Q.

    2011-10-01

    The influence of perpendicular ExB shear flow on peeling-ballooning instabilities is investigated with BOUT++ code. In our simulation, a set of reduced MHD equations are solved for a very unstable equilibrium and a marginal unstable equilibrium in shifted-circular tokamak geometry. For ideal MHD cases without diamagnetic terms and resistivity, we find that flow shear shows dramatic stabilizing effect on peeling-ballooning modes and the stabilizing degree increases with mode number. When the flow shear is large enough, we find the curvature of growth rate verse mode number has the same shape like that for the case with only diamagnetic term, and this implies that diamagnetic term and the shear flow have the same mechanism acting on peeling-ballooning instabilities. The role of Kelvin-Helmholtz term is also investigated and we find it is destabilizing and the effect depends on both flow shear and mode number. For cases with both diamagnetic term and the applied shear flow, modes with intermediate mode number are strongest stabilized while high n and low n mode keep unstable. Based on these results, an ELM trigger sketch is proposed. Performed for USDoE by LLNL Contract DE-AC52-07NA27344.

  11. Trans-Balloon Visualisation During Dilatation (TBVD) of Oesophageal Strictures: a Novel Innovation.

    Science.gov (United States)

    Khokhar, Haseeb A; Azeem, Beenish; Bughio, Mumtaz; Bass, Gary A; Elfadul, Amr; Salih, Monim; Fahmy, Waleed; Walsh, Thomas N

    2016-04-01

    Hydrostatic balloon dilatation of upper gastrointestinal strictures is associated with a risk of perforation that varies with the underlying pathology and with the technique employed. We present a technique of trans-balloon visualisation of the stricture during dilatation (TBVD) that allows direct 'real-time' observation of the effect of dilatation on the stricture, facilitating early recognition of mucosal abruption, thereby reducing the perforation rate. We retrospectively analysed 100 consecutive patients, undergoing balloon dilatation of oesophageal strictures between 1st of January 2011 and 1st of July 2014. One hundred patients underwent 186 dilatations, with 34 having multiple procedures (mean 1.86). All had oesophageal strictures (mean diameter 8.49 mm, range 5-11 mm) and most underwent dilatation up to a maximum of 17 mm (mean 14.7 mm). Fifty-six percent were male and the average age was 62.5 years (17-89 years). Only one patient (0.5% of all procedures) had a full-thickness perforation requiring intervention while just one further patient had a deep mucosal tear that did not require intervention. TBVD is a safe technique with a short learning curve and is one of the important factors that allow potentially difficult dilatations to be performed safely with an exceptionally low rate of adverse events of less than 1%.

  12. Atmospheric properties measurements and data collection from a hot-air balloon

    Science.gov (United States)

    Watson, Steven M.; Olson, N.; Dalley, R. P.; Bone, W. J.; Kroutil, Robert T.; Herr, Kenneth C.; Hall, Jeff L.; Schere, G. J.; Polak, M. L.; Wilkerson, Thomas D.; Bodrero, Dennis M.; Borys, R. O.; Lowenthal, D.

    1995-02-01

    Tethered and free-flying manned hot air balloons have been demonstrated as platforms for various atmospheric measurements and remote sensing tasks. We have been performing experiments in these areas since the winter of 1993. These platforms are extremely inexpensive to operate, do not cause disturbances such as prop wash and high airspeeds, and have substantial payload lifting and altitude capabilities. The equipment operated and tested on the balloons included FTIR spectrometers, multi-spectral imaging spectrometer, PM10 Beta attenuation monitor, mid- and far-infrared cameras, a radiometer, video recording equipment, ozone meter, condensation nuclei counter, aerodynamic particle sizer with associated computer equipment, a tethersonde and a 2.9 kW portable generator providing power to the equipment. Carbon monoxide and ozone concentration data and particle concentrations and size distributions were collected as functions of altitude in a wintertime inversion layer at Logan, Utah and summertime conditions in Salt Lake City, Utah and surrounding areas. Various FTIR spectrometers have been flown to characterize chemical plumes emitted from a simulated industrial stack. We also flew the balloon into diesel and fog oil smokes generated by U.S. Army and U.S. Air Force turbine generators to obtain particle size distributions.

  13. Stented balloon fenestration before entry repair using the frozen elephant trunk technique for chronic aortic dissection.

    Science.gov (United States)

    Uchida, Naomichi; Yamane, Yoshitaka; Furukawa, Tomokuni

    2018-02-01

    Endovascular fenestration on the abdominal aorta is effective for preventing visceral malperfusion in aortic dissection. We report a case of stented balloon fenestration before residual entry repair using the frozen elephant trunk technique for chronic aneurysmal dissection after ascending aortic replacement for DeBakey I aortic dissection. We recognized poor communication between the true lumen and false lumen in the abdominal aorta, and visceral perfusion depended almost entirely on the proximal large entry. Therefore, we scheduled catheter angioplasty on the small re-entry before upstream entry closure. After balloon angioplasty using a PTA catheter, a 10-mm × 4-cm self-expandable stent was deployed at the re-entry. We performed open surgery 5 days after angioplasty. Computed tomography after entry repair showed complete thrombosis of the false lumen on the descending aorta, and the celiac and superior mesenteric arteries were supplied via the abdominal re-entry stent. Stented balloon fenestration before entry repair using frozen elephant trunk with chronic aortic dissection was effective for preventing visceral malperfusion. © The Author 2017. Published by Oxford University Press on behalf of the European Association for Cardio-Thoracic Surgery. All rights reserved.

  14. The Accordion Sign in the Transplant Ureter: Ramifications During Balloon Dilation of Strictures

    Energy Technology Data Exchange (ETDEWEB)

    Kriegshauser, J. Scott, E-mail: skriegshauser@mayo.edu; Naidu, Sailen G. [Mayo Clinic Hospital, Department of Radiology (United States); Chang, Yu-Hui H. [Mayo Clinic, Department of Biostatistics (United States); Huettl, Eric A. [Mayo Clinic Hospital, Department of Radiology (United States)

    2015-04-15

    PurposeThis study was designed to demonstrate the accordion sign within the transplant ureter and evaluate its ramifications during balloon dilation of strictures.MethodsA retrospective electronic chart and imaging review included demographic characteristics, procedure reports, and complications of 28 renal transplant patients having ureteral strictures treated with percutaneous balloon dilation reported in our transplant nephrology database during an 8-year period. The accordion sign was deemed present or absent on the basis of an imaging review and was defined as present when a tortuous ureter became kinked and irregular when foreshortened after placement of a wire or a catheter. Procedure-related urine leaks were categorized as occurring at the stricture if within 2 cm; otherwise, they were considered away from the stricture.ResultsThe accordion sign was associated with a significantly greater occurrence of leaks away from the stricture (P = 0.001) but not at the stricture (P = 0.34).ConclusionsThe accordion sign is an important consideration when performing balloon dilation procedures on transplant ureteral strictures, given the increased risk of leak away from the stricture. Its presence should prompt additional care during wire and catheter manipulations.

  15. GDC embolization of wide-necked cerebral aneurysms using balloon-assisted technique

    Energy Technology Data Exchange (ETDEWEB)

    Park, Seong Ho; Baik, Seung Kug; Rhee, Dong Youl; Baik, Sun Mi; Choi, Han Yong; Kim, Bong Gi [Wallace Memorial Baptist Hospital, Pusan (Korea, Republic of)

    1999-08-01

    The main factor limiting endovascular treatment of intracranial aneurysms is the shape of the aneurysmal sac, especially the width of the neck. We describe an early experience and technical aspects of treating wide-necked cerebral aneurysm using a Guglielmi detachable coil (GDC) and simultaneous application of a temporary balloon. Four cases of unruptured wide-necked cerebral aneurysm were treated with GDC, with simultaneous application of a temporary balloon. Patients were aged between 29 and 49 years. On admission, clinical presentation was subarachnoid hemorrhage (SAH) in all cases. Hunt and Hess grade was 2 in two cases, 3 in one case, and traumatic SAH in one case. In all patients angiography revealed an asymptomatic aneurysm after rupture of another aneurysm or traumatic SAH. The aneurysms were occluded with GDC-10, and a Cirrus balloon occlusion system was used simultaneously. All procedures were performed under endotracheal general anesthesia and systemic heparinization. All cases were treated successfully, without parent artery compromise. The occlusion rate at the end of the procedure was total in three cases and subtotal in one. In one case a heparin-related hematoma occurred during post-procedural treatment and the patient eventually expired. One patient underwent follow-up angiography after 6 months, and the coil was not changed. An aneurysm may not be completely occluded, but with regard to coil compaction and parent artery preservation, the technique is an attractive alternative.

  16. [Results of percutaneous mitral balloon commissurotomy in pregnant women about 12 cases].

    Science.gov (United States)

    Zairi, I; Mzoughi, K; Mroua, F; Ben Moussa, F; Amri, I; Kammoun, S; Fennira, S; Kraiem, S

    2018-02-01

    Mitral stenosis (MS) is the most common valvular heart disease revealed or exacerbated by pregnancy. Percutaneous mitral balloon commissurotomy (PMC) is currently the treatment of choice when mitral valve morphology is favorable. The purpose of this study is to evaluate the immediate, medium and long term results of percutaneous mitral balloon commissurotomy in pregnant women with a severe symptomatic mitral stenosis despite medical treatment. It is a retrospective study including 12 pregnant patients diagnosed with severe mitral stenosis and hospitalized in the cardiology department of Habib Thameur hospital between 1994 and 2014. A clinical and ultrasonographic monitoring was performed for over 15 years. Mean patients age was 31.5±4.4 years. All patients were in NYHA class III or IV despite medical treatment. Mitral regurgitation was rated as moderate in four cases. Functional improvement was observed in all cases immediately after the procedure. Mitral valve area increased from 1.02±0.5cm 2  averaged to 2±0.35cm 2 . Mitral regurgitation increased in three cases and appeared in two cases. All patients delivered at term. Newborns were all healthy. Two of them had a low birth weight. On the long term follow-up (95.58±64.1 months), five patients had mitral restenosis: two had a surgical valve replacement and three underwent a second percutaneous mitral balloon commissurotomy. The effectiveness of the percutaneous mitral balloon commissurotomy is clearly documented by clinical and echocardiographic evaluation. In the case of pregnancy, the goal is not so much to obtain an optimal result but to cause hemodynamic improvement authorizing the continuation of pregnancy and childbirth. Copyright © 2016 Elsevier Masson SAS. All rights reserved.

  17. Antioxidants attenuate atherosclerotic plaque development in a balloon-denuded and -radiated hypercholesterolemic rabbit

    International Nuclear Information System (INIS)

    Leborgne, Laurent; Fournadjiev, Jana; Pakala, Rajbabu; Dilcher, Christian; Cheneau, Edouard; Wolfram, Roswitha; Hellinga, David; Seaborn, Rufus; O'Tio, Fermin; Waksman, Ron

    2003-01-01

    Background: Oxidation of lipoproteins is considered to be a key contributor to atherogenesis. Antioxidants are potential antiatherogenic agents because they can inhibit lipoprotein oxidation. Radiation has been shown to increase oxidative stress leading to increased atherogenesis. This study is designed to test the potential of antioxidants to inhibit atherosclerotic plaque progression in balloon-denuded and -radiated rabbits. Methods and Results: Two groups of New Zealand white rabbits (n=36) were fed with 1% cholesterol diet (control diet) or with 1% cholesterol diet containing a mixture of various antioxidants for 1 week. Iliac arteries in all the animals were balloon denuded and continued to fed with 0.15% cholesterol diet or 0.15% cholesterol diet containing antioxidants (antioxidant diet). Four weeks after balloon denudation one iliac artery in 12 animals from each group was radiated and all the animals were continued to be fed with the same diet. Four weeks after radiation animals were sacrificed and morphometric analysis of iliac arteries (n=12) in nonradiated and radiated animals were performed. Plaque area (PA) in the rabbits that were fed with cholesterol diet is 0.2±0.12 mm 2 , and it is increased by 2.75-fold (P<.05) in the radiated arteries of animals fed with cholesterol diet. Plaque area in the animals fed with antioxidant diet is 50% less then the one in the animals fed with cholesterol diet. Similarly, plaque area in radiated arteries of the animals fed with antioxidant diet is 50% less then the animals fed with cholesterol diet. Conclusion: Antioxidants significantly attenuate atherosclerotic plaque progression in balloon-injured and -radiated hypercholesterolemic rabbits

  18. Solar polarimetry in the K I D2 line : A novel possibility for a stratospheric balloon

    Science.gov (United States)

    Quintero Noda, C.; Villanueva, G. L.; Katsukawa, Y.; Solanki, S. K.; Orozco Suárez, D.; Ruiz Cobo, B.; Shimizu, T.; Oba, T.; Kubo, M.; Anan, T.; Ichimoto, K.; Suematsu, Y.

    2018-03-01

    Of the two solar lines, K I D1 and D2, almost all attention so far has been devoted to the D1 line, as D2 is severely affected by an O2 atmospheric band. This, however, makes the latter appealing for balloon and space observations from above (most of) the Earth's atmosphere. We estimate the residual effect of the O2 band on the K I D2 line at altitudes typical for stratospheric balloons. Our aim is to study the feasibility of observing the 770 nm window. Specifically, this paper serves as a preparation for the third flight of the Sunrise balloon-borne observatory. The results indicate that the absorption by O2 is still present, albeit much weaker, at the expected balloon altitude. We applied the obtained O2 transmittance to K I D2 synthetic polarimetric spectra and found that in the absence of line-of-sight motions, the residual O2 has a negligible effect on the K I D2 line. On the other hand, for Doppler-shifted K I D2 data, the residual O2 might alter the shape of the Stokes profiles. However, the residual O2 absorption is sufficiently weak at stratospheric levels that it can be divided out if appropriate measurements are made, something that is impossible at ground level. Therefore, for the first time with Sunrise III, we will be able to perform polarimetric observations of the K I D2 line and, consequently, we will have improved access to the thermodynamics and magnetic properties of the upper photosphere from observations of the K I lines.

  19. Controlled weather balloon ascents and descents for atmospheric research and climate monitoring

    Science.gov (United States)

    Kräuchi, Andreas; Philipona, Rolf; Romanens, Gonzague; Hurst, Dale F.; Hall, Emrys G.; Jordan, Allen F.

    2016-03-01

    In situ upper-air measurements are often made with instruments attached to weather balloons launched at the surface and lifted into the stratosphere. Present-day balloon-borne sensors allow near-continuous measurements from the Earth's surface to about 35 km (3-5 hPa), where the balloons burst and their instrument payloads descend with parachutes. It has been demonstrated that ascending weather balloons can perturb the air measured by very sensitive humidity and temperature sensors trailing behind them, particularly in the upper troposphere and lower stratosphere (UTLS). The use of controlled balloon descent for such measurements has therefore been investigated and is described here. We distinguish between the single balloon technique that uses a simple automatic valve system to release helium from the balloon at a preset ambient pressure, and the double balloon technique that uses a carrier balloon to lift the payload and a parachute balloon to control the descent of instruments after the carrier balloon is released at preset altitude. The automatic valve technique has been used for several decades for water vapor soundings with frost point hygrometers, whereas the double balloon technique has recently been re-established and deployed to measure radiation and temperature profiles through the atmosphere. Double balloon soundings also strongly reduce pendulum motion of the payload, stabilizing radiation instruments during ascent. We present the flight characteristics of these two ballooning techniques and compare the quality of temperature and humidity measurements made during ascent and descent.

  20. Mechanism of prostatic urethroplasty with balloon catheter

    International Nuclear Information System (INIS)

    Castaneda, F.; Maynar, M.; Hulbert, J.

    1988-01-01

    A series of 60 patients have undergone prostatic urethroplasty with balloon catheters at our institution. The follow-up of these patients has ranged from more than 3 years to not less than 6 months. The preliminary results have been excellent, with a success rate of 75% in patients with predominant lateral lobe hypertrophy. This success rate drops to 25% in patients with predominant middle lobe hypertrophy. In previous communications the authors have proposed that the mechanism of prostatic urethral relief of obstruction is due to stretching of the prostatic capsule, tissue compression, and possible subsequent atrophy, as suggested by findings of transrectal US, MR imaging, voiding and retrograde urethrography, and urinary flow studies. Recent clinical information that has led to further animal research has shown that in addition to the previously supposed mechanism of action, separation of the prostatic lobes occurs by splitting of the anterior and posterior commissures of the prostatic gland tissue. This separation of the prostatic lobes is therefore the goal of the procedure. As more experience is gained, the already high success rate can probably be improved

  1. Cifoplastia no tratamento da fratura vertebral por insuficiência: avaliação funcional prospectiva Cifoplastia en el tratamiento de la fractura vertebral por insuficiencia: evaluación funcional prospectiva Kyphoplasty in the treatment of vertebral compression fracture: prospective functional evaluation

    Directory of Open Access Journals (Sweden)

    Bartolomeu Ribeiro Coutinho Filho

    2011-01-01

    located in the thoracolumbar spine. METHODS: Prospective study in which adult patients diagnosed with vertebral compression fracture with a course over eight weeks, with pain at the fracture site and bone edema evident by MRI imaging were identified and evaluated for the study. The functional evaluation was performed through the Oswestry Disability Index 2.0 and Visual Analogue Scale of Pain pre- and postoperatively. The personal satisfaction with treatment was measured by the scale of Johnson. RESULTS: A significant improvement in pain with an average fall of 6.4 points in the Visual Analogue Scale of Pain at the end of twelve months of follow-up compared to preoperatively (p < 00.5. The functional evaluation showed 88% excellent or good results, with seven patients (41% with excellent results and eight patients (47% with good results. Two patients (12% maintained their functional assessment unchanged. As to the subjective degree of satisfaction, 82% said they were satisfied, and of those, 59% were completely satisfied and 23% satisfied with minimal restrictions. Three patients (18% reported being dissatisfied with the outcome of the procedure. CONCLUSION: Kyphoplasty has proven effective in improving the function and relieving the pain in patients with vertebral compression fracture. The occurrence of a serious complication (AMI calls attention to the need for proper hospital care during the procedure.

  2. Beyond the balloon: excimer coronary laser atherectomy used alone or in combination with rotational atherectomy in the treatment of chronic total occlusions, non-crossable and non-expansible coronary lesions.

    Science.gov (United States)

    Fernandez, Juan P; Hobson, Alex R; McKenzie, Daniel; Shah, Nimit; Sinha, Manas K; Wells, Tim A; Levy, Terry M; Swallow, Rosie A; Talwar, Suneel; O'Kane, Peter D

    2013-06-22

    To establish success and complication rates of excimer laser coronary atherectomy (ELCA) in a contemporary series of patients with balloon failure during percutaneous coronary intervention (PCI) of both chronic total occlusions (CTO) and lesions with distal TIMI 3 flow. We identified 58 cases of balloon failure treated with ELCA±rotational atherectomy (RA) over four years, representing 0.84% of all PCI performed in our centre during this period. Balloon failures were classified according to: (i) mechanism of balloon failure; and (ii) whether this occurred in the context of treating a CTO. ELCA was performed following balloon failure using the CVX-300 Excimer Laser System and a 0.9 mm catheter with saline flush. For the entire cohort, procedure success was achieved in 91% (with ELCA successful: alone in 76.1%, after RA failure in 6.8% and in combination with RA for 8.6%). Only in one case did RA succeed where ELCA had failed. There were four procedure-related complications, including transient no-reflow, side branch occlusion and two coronary perforations, of which one was directly attributable to ELCA and led to subsequent mortality. ELCA provides safe and effective adjunctive therapy in contemporary PCI to treat lesions associated with balloon failure due to an inability either to cross the lesion or to expand a balloon sufficiently to permit stenting. ELCA was successful in the majority of these selected cases when used independently with further effectiveness achieved when combined with RA or after RA failure.

  3. The University of Alberta High Altitude Balloon Program

    Science.gov (United States)

    Johnson, W.; Buttenschoen, A.; Farr, Q.; Hodgson, C.; Mann, I. R.; Mazzino, L.; Rae, J.; University of Alberta High Altitude Balloon Team

    2011-12-01

    The University of Alberta High Altitude Balloon (UA-HAB) program is a one and half year program sponsored by the Canadian Space Agency (CSA) that offers hands on experience for undergraduate and graduate students in the design, build, test and flight of an experimental payload on a high altitude balloon platform. Utilising low cost weather balloon platforms, and through utilisation of the CSA David Florida Laboratory for thermal-vacuum tests , in advance of the final flight of the payload on a NASA high altitude balloon platform. Collectively the program provided unique opportunities for students to experience mission phases which parallel those of a space satellite mission. The program has facilitated several weather balloon missions, which additionally provide educational opportunities for university students and staff, as well as outreach opportunities among junior and senior high school students. Weather balloon missions provide a cheap and quick alternative to suborbital missions; they can be used to test components for more expensive missions, as well as to host student based projects from different disciplines such as Earth and Atmospheric Sciences (EAS), Physics, and Engineering. In addition to extensive skills development, the program aims to promote recruitment of graduate and undergraduate students into careers in space science and engineering. Results from the UA-HAB program and the flight of the UA-HAB shielded Gieger counter payload for cosmic ray and space radiation studies will be presented. Lessons learned from developing and maintaining a weather balloon program will also be discussed. This project is undertaken in partnership with the High Altitude Student Platform, organized by Louisiana State University and the Louisiana Space Consortium (LaSpace), and sponsored by NASA, with the financial support of the Canadian Space Agency.

  4. Assessing the Potential of Stratospheric Balloons for Planetary Science

    Science.gov (United States)

    Kremic, Tibor; Hibbitts, Karl; Young, Eliot; Landis, Robert; Noll, Keith; Baines, Kevin

    2013-01-01

    Recent developments in high altitude balloon platform capabilities, specifically long duration flights in excess of 50 days at over 100,000 ft and precision pointing with performance at the arc sec level or better have raised the question whether this platform can be utilized for high-value planetary science observations. In January of 2012 a workshop was held at NASA Glenn Research Center in Cleveland, Ohio to explore what planetary science can be achieved utilizing such a platform. Over 40 science concepts were identified by the scientists and engineers attending the workshop. Those ideas were captured and then posted to a public website for all interested planetary scientists to review and give their comments. The results of the workshop, and subsequent community review, have demonstrated that this platform appears to have potential for high-value science at very competitive costs. Given these positive results, the assessment process was extended to include 1) examining, in more detail, the requirements for the gondola platform and the mission scenarios 2) identifying technical challenges and 3) developing one or more platform concepts in enough fidelity to enable accurate estimating of development and mission costs. This paper provides a review of the assessment, a summary of the achievable science and the challenges to make that science a reality with this platform.

  5. Preliminary investigation of adjustable balloon implant for type I thyroplasty.

    Science.gov (United States)

    Hoffman, Matthew R; Witt, Rachel E; McCulloch, Timothy M; Jiang, Jack J

    2011-04-01

    We present the adjustable balloon implant (ABI), a novel implant to be used in type I thyroplasty for the treatment of vocal fold paralysis. The ABI offers the same medialization provided by other implants, but can easily be catered to individual patient anatomy as well as modified postoperatively without the need for a revision thyroplasty. Repeated measures with each larynx serving as its own control. Medialization thyroplasty (MT) with the ABI was performed on five excised canine larynges. Mucosal wave, aerodynamic, and acoustic parameters were measured for three conditions: normal; right vocal fold paralysis; and paralysis with the ABI. Insertion of the ABI resulted in significant decreases in both phonation threshold pressure and phonation threshold flow. Perturbation parameters of percent jitter and percent shimmer were also significantly decreased and restored to normal levels. Signal-to-noise ratio was significantly increased to the normal level as well. The mucosal wave was preserved after implant insertion. This preliminary experiment showing significant improvements in aerodynamic and acoustic parameters demonstrates the potential of the ABI as a thyroplasty implant. Effective medialization and preservation of the mucosal wave combined with postoperative adjustability makes it a potentially valuable clinical device. Copyright © 2011 The American Laryngological, Rhinological, and Otological Society, Inc., Rhinological, and Otological Society, Inc.

  6. Numerical modeling of the 2017 active seismic infrasound balloon experiment

    Science.gov (United States)

    Brissaud, Q.; Komjathy, A.; Garcia, R.; Cutts, J. A.; Pauken, M.; Krishnamoorthy, S.; Mimoun, D.; Jackson, J. M.; Lai, V. H.; Kedar, S.; Levillain, E.

    2017-12-01

    We have developed a numerical tool to propagate acoustic and gravity waves in a coupled solid-fluid medium with topography. It is a hybrid method between a continuous Galerkin and a discontinuous Galerkin method that accounts for non-linear atmospheric waves, visco-elastic waves and topography. We apply this method to a recent experiment that took place in the Nevada desert to study acoustic waves from seismic events. This experiment, developed by JPL and its partners, wants to demonstrate the viability of a new approach to probe seismic-induced acoustic waves from a balloon platform. To the best of our knowledge, this could be the only way, for planetary missions, to perform tomography when one faces challenging surface conditions, with high pressure and temperature (e.g. Venus), and thus when it is impossible to use conventional electronics routinely employed on Earth. To fully demonstrate the effectiveness of such a technique one should also be able to reconstruct the observed signals from numerical modeling. To model the seismic hammer experiment and the subsequent acoustic wave propagation, we rely on a subsurface seismic model constructed from the seismometers measurements during the 2017 Nevada experiment and an atmospheric model built from meteorological data. The source is considered as a Gaussian point source located at the surface. Comparison between the numerical modeling and the experimental data could help future mission designs and provide great insights into the planet's interior structure.

  7. Proliferation kinetics of paramecium tetraurelia in balloon-borne experiments

    International Nuclear Information System (INIS)

    Croute, F.; Soleilhavoup, J.P.; Vidal, S.; Rousseille, R.; Planel, H.

    1982-01-01

    Experiments were carried out to demonstrate the effect of cosmic radiation, at a balloon-flight ceiling of about 36,500 m (120,000 ft) on single-cell organism proliferation. Paramecium tetraurelia were placed in air-tight containers and maintained at 25 degrees +/- 0.1 degrees C. Cellular growth was determined by cell count, either after recovery or during the flight, by means of an automatic fixation device. Dosimetry was performed by a tissue equivalent proportional counter and was of about 0.5 mrad/h. Flight ceiling duration ranged from 48 min - 22 h. A secondary stimulating effect of growth rate, preceded by a temporary decrease, was observed after recovery. Because of the high bacterial concentration in the trans-Mediterranean flight culture medium, the temporary drop of the growth rate, due to the radiolysis products, disappears. Researchers consider that the stimulating effect can be the result of enzymatic intracellular scavenging of radiolysis products generated in the cell

  8. Resuscitative Endovascular Balloon Occlusion of the Aorta: Pushing Care Forward.

    Science.gov (United States)

    Teeter, William; Romagnoli, Anna; Glaser, Jacob; Fisher, Andrew D; Pasley, Jason; Scheele, Brian; Hoehn, Melanie; Brenner, Megan

    Resuscitative endovascular balloon occlusion of the aorta (REBOA), used to temporize noncompressible and junctional hemorrhage, may be deployable to the forward environment. Our hypothesis was that nonsurgeon physicians and high-level military medical technicians would be able to learn the theory and insertion of REBOA. US Army Special Operations Command medical personnel without prior endovascular experience were included. All participants received didactic instruction of the Basic Endovascular Skills for Trauma Course™ together, with individual evaluation of technical skills. A pretest and a posttest were administered to assess comprehension. Four members of US Army Special Operations Command-two nonsurgeon physicians, one physician assistant, and one Special Operations Combat Medic-were included. REBOA procedural times moving from trial 1 to trial 6 decreased significantly from 186 ± 18.7 seconds to 83 ± 10.3 seconds (ρ < .0001). All participants demonstrated safe REBOA insertion and verbalized the indications for REBOA insertion and removal through all trials. All five procedural tasks were performed correctly by each participant. Comprehension and knowledge between the pretest and posttest improved significantly from 67.6 ± 7.3% to 81.3 ± 8.1% (ρ = .039). This study demonstrates that nonsurgeon and nonphysician providers can learn the steps required for REBOA after arterial access is established. Although insertion is relatively straightforward, the inability to gain arterial access percutaneously is prohibitive in providers without a surgical skillset and should be the focus of further training. 2017.

  9. Learning curve, diagnostic yield and safety of single balloon enteroscopy.

    Science.gov (United States)

    Dutta, Amit Kumar; Sajith, Kattiparambil Gangadharan; Joseph, Anjilivelil J; Simon, Ebby George; Chacko, Ashok

    2012-01-01

    Single balloon enteroscopy (SBE) is a recently developed diagnostic modality to assess small bowel mucosa. The data on learning curve of SBE is scanty. We aimed to assess the learning curve, diagnostic yield and safety of SBE. All patients who underwent SBE at our centre from December 2007 to December 2010 were included retrospectively. The clinical details, enteroscopy findings and procedure related details were obtained for each patient from a prospectively maintained database. The extent of small bowel visualised with increasing number of procedures by a single endoscopist (Endoscopist A) who performed most of the procedures was used to estimate the learning curve using locally weighted regression curve. The diagnostic yield and complications rates of SBE were also estimated. The study was approved by the institute review board and ethics committee. Ninety SBEs were performed in 84 patients (age: 42+15 years, 27.4% females). 57 procedures were performed (32 antegrade and 25 retrograde) by endoscopist A. There was gradual improvement in the extent of small bowel visualised during the first 15 procedures via antegrade route followed by flattening of curve. The retrograde route showed no definite trend towards improvement during the procedures performed. The overall diagnostic yield of SBE was 32.1%. There was no complication except for mild self-limiting abdominal pain in one patient. SBE via antegrade route has a higher success rate and better learning curve than the retrograde route. SBE is a safe procedure and helps in establishing a diagnosis in one-third of the patients examined.

  10. Balloon-augmented carotid artery sacrifice with Onyx: a proof of concept study in a swine model.

    Science.gov (United States)

    Spiotta, Alejandro M; Sivapatham, Thinesh; Teng, Qingshan; Moskowitz, Shaye I; Hui, Ferdinand K

    2011-12-01

    Carotid sacrifice remains a valuable tool in the treatment of select vascular lesions. Neurointerventionalists have relied on coil embolization as their primary means of carotid sacrifice, a procedure that can be lengthy and expensive with long fluoroscopy times. We investigated a novel technique for carotid sacrifice in a swine model using temporary balloon occlusion to achieve proximal flow arrest in the carotid artery while embolizing the vessel with a liquid embolic agent. A total of 10 common carotid artery sacrifices were performed in pigs under fluoroscopic guidance. Various balloons were employed to achieve near total proximal flow arrest to allow an Onyx cast to accumulate in the target vessel. The technique for sacrifice was modified during the experiment with the final procedures yielding successful sacrifice using Onyx through a dimethylsulfoxide-tolerant catheter (Echelon 14) with the assistance of two fibered coils and a 5 mm × 30 mm Hyperglide balloon resulting in a 2.5 cm long cast. Carotid artery sacrifice using commercially available non-adhesive liquid embolic agents is feasible with balloon assistance, allowing for reduced radiation and material costs. Coils may be beneficial in providing an anchor point for liquid embolic deposition, as well as reducing the volume of liquid embolysate required to achieve vessel occlusion.

  11. Intracavitary moderator balloon combined with (252)Cf brachytherapy and boron neutron capture therapy, improving dosimetry in brain tumour and infiltrations.

    Science.gov (United States)

    Brandão, S F; Campos, T P R

    2015-07-01

    This article proposes a combination of californium-252 ((252)Cf) brachytherapy, boron neutron capture therapy (BNCT) and an intracavitary moderator balloon catheter applied to brain tumour and infiltrations. Dosimetric evaluations were performed on three protocol set-ups: (252)Cf brachytherapy combined with BNCT (Cf-BNCT); Cf-BNCT with a balloon catheter filled with light water (LWB) and the same set-up with heavy water (HWB). Cf-BNCT-HWB has presented dosimetric advantages to Cf-BNCT-LWB and Cf-BNCT in infiltrations at 2.0-5.0 cm from the balloon surface. However, Cf-BNCT-LWB has shown superior dosimetry up to 2.0 cm from the balloon surface. Cf-BNCT-HWB and Cf-BNCT-LWB protocols provide a selective dose distribution for brain tumour and infiltrations, mainly further from the (252)Cf source, sparing the normal brain tissue. Malignant brain tumours grow rapidly and often spread to adjacent brain tissues, leading to death. Improvements in brain radiation protocols have been continuously achieved; however, brain tumour recurrence is observed in most cases. Cf-BNCT-LWB and Cf-BNCT-HWB represent new modalities for selectively combating brain tumour infiltrations and metastasis.

  12. Intracavitary moderator balloon combined with 252Cf brachytherapy and boron neutron capture therapy, improving dosimetry in brain tumour and infiltrations

    Science.gov (United States)

    Brandão, S F

    2015-01-01

    Objective: This article proposes a combination of californium-252 (252Cf) brachytherapy, boron neutron capture therapy (BNCT) and an intracavitary moderator balloon catheter applied to brain tumour and infiltrations. Methods: Dosimetric evaluations were performed on three protocol set-ups: 252Cf brachytherapy combined with BNCT (Cf-BNCT); Cf-BNCT with a balloon catheter filled with light water (LWB) and the same set-up with heavy water (HWB). Results: Cf-BNCT-HWB has presented dosimetric advantages to Cf-BNCT-LWB and Cf-BNCT in infiltrations at 2.0–5.0 cm from the balloon surface. However, Cf-BNCT-LWB has shown superior dosimetry up to 2.0 cm from the balloon surface. Conclusion: Cf-BNCT-HWB and Cf-BNCT-LWB protocols provide a selective dose distribution for brain tumour and infiltrations, mainly further from the 252Cf source, sparing the normal brain tissue. Advances in knowledge: Malignant brain tumours grow rapidly and often spread to adjacent brain tissues, leading to death. Improvements in brain radiation protocols have been continuously achieved; however, brain tumour recurrence is observed in most cases. Cf-BNCT-LWB and Cf-BNCT-HWB represent new modalities for selectively combating brain tumour infiltrations and metastasis. PMID:25927876

  13. Monte Carlo dose characterization of a new 90Sr/90Y source with balloon for intravascular brachytherapy

    International Nuclear Information System (INIS)

    Wang Ruqing; Li, X. Allen; Lobdell, John

    2003-01-01

    Beta emitting source wires or seeds have been adopted in clinical practice of intravascular brachytherapy for coronary vessels. Due to the limitation of penetration depth, this type of source is normally not applicable to treat vessels with large diameter, e.g., peripheral vessel. In the effort to extend application of its beta source for peripheral vessels, Novoste has recently developed a new catheter-based system, the Corona trade mark sign 90 Sr/ 90 Y system. It is a source train of 6 cm length and is jacketed by a balloon. The existence of the balloon increases the penetration of the beta particles and maintains the source within a location away from the vessel wall. Using the EGSnrc Monte Carlo system, we have calculated the two-dimensional (2-D) dose rate distribution of the Corona trade mark sign system in water for a balloon diameter of 5 mm. The dose rates on the transverse axis obtained in this study are in good agreement with calibration results of the National Institute of Standards and Technology for the same system for balloon diameters of 5 and 8 mm. Features of the 2-D dose field were studied in detail. The dose parameters based on AAPM TG-60 protocol were derived. For a balloon diameter of 5 mm, the dose rate at the reference point (defined as r 0 =4.5 mm, 2 mm from the balloon surface) is found to be 0.010 28 Gy min -1 mCi -1 . A new formalism for a better characterization of this long source is presented. Calculations were also performed for other balloon diameters. The dosimetry for this source is compared with a 192 Ir source, commonly used for peripheral arteries. In conclusion, we have performed a detailed dosimetric characterization for a new beta source for peripheral vessels. Our study shows that, from dosimetric point of view, the Corona trade mark sign system can be used for the treatment of an artery with a large diameter, e.g., peripheral vessel

  14. Ideal ballooning stability of JET discharges

    International Nuclear Information System (INIS)

    Galvao, R.M.O.; Lazzaro, E.; O'Rourke, J.; Smeulders, P.; Schmidt, G.

    1989-01-01

    Conditions under which ballooning modes are expected to be excited have recently been obtained in two different types of discharges in JET. In the first type, discharges with β approaching the Troyon-Sykes-Wesson critical value β c for optimised pressure profiles have been produced at low toroidal fields (B T =1.5T). In the second type, extremely high pressure gradients have been produced in the plasma core through pellet injection in the current rise phase of the discharge followed by strong additional heating. The stability of these discharges has been studied with the stability code HBT coupled to the equilibrium identification code IDENTC. The equilibrium pressure and diamagnetic function profiles are determined in IDENTC by an optimisation procedure to fit the external magnetic measurements. The resulting pressure profile in the equatorial plane is then compared with the profile derived from 'direct' measurements, i.e. electron density and temperature profiles measured by the LIDAR diagnostic system, ion-temperature profile measured by the charge-exchange diagnostic system, and ion density profile calculated from the Z eff and electron density profiles. Furthermore, the value of the safety factor q on axis is compared with that determined from polarimetry. When good agreement is found, the output data from IDENTC is passed directly to HBT to carry out the stability analysis. When there is not a good agreement, as in the case of pellet discharges with highly peaked pressure profiles, the equilibrium is reevaluated using the 'experimental' profile and the data from polarimetry. (author) 6 refs., 4 figs

  15. Aerial Deployment and Inflation System for Mars Helium Balloons

    Science.gov (United States)

    Lachenmeler, Tim; Fairbrother, Debora; Shreves, Chris; Hall, Jeffery, L.; Kerzhanovich, Viktor V.; Pauken, Michael T.; Walsh, Gerald J.; White, Christopher V.

    2009-01-01

    A method is examined for safely deploying and inflating helium balloons for missions at Mars. The key for making it possible to deploy balloons that are light enough to be buoyant in the thin, Martian atmosphere is to mitigate the transient forces on the balloon that might tear it. A fully inflated Mars balloon has a diameter of 10 m, so it must be folded up for the trip to Mars, unfolded upon arrival, and then inflated with helium gas in the atmosphere. Safe entry into the Martian atmosphere requires the use of an aeroshell vehicle, which protects against severe heating and pressure loads associated with the hypersonic entry flight. Drag decelerates the aeroshell to supersonic speeds, then two parachutes deploy to slow the vehicle down to the needed safe speed of 25 to 35 m/s for balloon deployment. The parachute system descent dynamic pressure must be approximately 5 Pa or lower at an altitude of 4 km or more above the surface.

  16. New Heights with High-Altitude Balloon Launches for Effective Student Learning and Environmental Awareness

    Science.gov (United States)

    Voss, H. D.; Dailey, J. F.; Takehara, D.; Krueger, J. M.

    2009-12-01

    Over a seven-year period Taylor University, an undergraduate liberal art school, has successfully launched and recovered over 200 sophisticated student payloads to altitudes between 20-33 km (100% success with rapid recovery) with flight times between 2 to 6 hrs. All of the payloads included two GPS tracking systems, cameras and monitors, a 110 kbit down link, an uplink command capability for educational experiments (K-12 and undergrad). Launches were conducted during the day and night, with multiple balloons, with up to 10 payloads for experiments, and under varying weather and upper atmospheric conditions. The many launches in a short period of time allowed the payload bus design to evolve toward increased performance, reliability, standardization, simplicity, and modularity for low-cost launch services. Through NSF and NASA grants, the program has expanded leading to over 50 universities trained at workshops to implement high altitude balloon launches in the classroom. A spin-off company (StraoStar Systems LLC) now sells the high-altitude balloon system and facilitates networking between schools. This high-altitude balloon program helps to advance knowledge and understanding across disciplines by giving students and faculty rapid and low-cost access to earth/ecology remote sensing from high altitude, insitu and limb atmospheric measurements, near-space stratosphere measurements, and IR/UV/cosmic ray access to the heavens. This new capability is possible by exposing students to recent advances in MEMS technology, nanotechnology, wireless telecommunication systems, GPS, DSPs and other microchip miniaturizations to build climate change and ways to mitigate global warming, and the excitement of taking measurements in a much uncharted region of our atmosphere. Teaching the scientific method or learning cycle (theory, research, instrumentation, operations, data analysis, and presentation) is a significant pedagogical building block that stimulates and retains students

  17. In-office, multisinus balloon dilation: 1-Year outcomes from a prospective, multicenter, open label trial.

    Science.gov (United States)

    Gould, James; Alexander, Ian; Tomkin, Edward; Brodner, David

    2014-01-01

    The objective of this prospective, multicenter study was to assess 1-year changes in sinonasal symptoms and health care use after office-based multisinus balloon dilation. Adults diagnosed with chronic or recurrent acute rhinosinusitis per the 2007 adult sinusitis guidelines were enrolled in this Institutional Review Board-approved study. Balloon dilation of the maxillary sinuses/ethmoid infundibula with or without frontal or sphenoid ostial dilation was performed in the physician's office under local anesthesia. Intraoperative procedure technical success and subject procedure tolerance were recorded. Efficacy was assessed using the patient-reported 20-item Sino-Nasal Outcome Test (SNOT-20) and Rhinosinusitis Symptom Inventory (RSI). Complications and revision surgeries were also recorded. A total of 313 ostial dilations were attempted and 307 were successfully completed (98.1%) in 81 subjects. Mean procedure tolerance was 2.8 ± 2.2 (0 = no pain; 10 = severe pain). Clinically meaningful and statistically significant (p < 0.0001) mean SNOT-20 symptom improvement was observed at 1 and 6 months and sustained through 1 year. The RSI treatment effect for all major rhinosinusitis symptoms was "large" and improvement in each was significant (p < 0.0001). Compared with the previous 1-year period, patients reported an average of 2.3 fewer acute sinus infections (p < 0.0001), 2.4 fewer antibiotic courses taken (p < 0.0001), and 3.0 fewer sinus-related physician visits (p < 0.0001) after balloon dilation. No serious device or procedure-related adverse events occurred. One subject (1.3%) underwent revision surgery. In-office, multisinus balloon dilation is safe, effective, and well tolerated. Patients reported significant reductions in both sinonasal symptoms and health care use after balloon dilation. Efficacy observed at 1 and 6 month follow-up was sustained through 1 year with a very low rate of revision surgery. This study was a part of the clinical trial NCT01612780

  18. Pre-test prediction and post-test analysis of PWR fuel rod ballooning in the MT-3 in-pile LOCA simulation experiment in the NRU reactor

    International Nuclear Information System (INIS)

    Donaldson, A.T.; Horwood, R.A.; Healey, T.

    1983-01-01

    The USNRC and the UKAEA have jointly funded a series of in-pile LOCA simulation experiments in the Canadian NRU reactor in order to secure further information on the thermal hydraulic and clad deformation response of PWR fuel rod bundles. Test MT-3 in the series was performed using reflood rate and rod internal pressure conditions specified by the UK nuclear industry. The parameters were selected to ensure the development of a near-isothermal clad temperature history during which zircaloy was required to balloon and rupture near the alpha-alpha/beta phase transition. Specification of the reflood rate conditions was assisted by the performance of a precursor test on an unpressurised rod bundle and by complementary application of appropriate thermal hydraulic analyses. Identification of the rod internal pressure needed to cause ballooning and rupture was achieved using a creep deformation model, BALLOON, in conjunction with the clad thermal history defined by the prior thermal hydraulic test. This paper presents the basis of the BALLOON analysis and describes its application in calculating the fill gas pressure for rods MT-3, their axial ballooning profile and the clad temperature at peak radial strain elevations. (author)

  19. Collapse of the balloon-expandable stent in the common iliac artery due to minor external compression in a lean patient

    Energy Technology Data Exchange (ETDEWEB)

    Park, Sung Eun; Choi, Ho Cheol; Choi, Dae Seob; Lee, Sang Min; Lee, Jung Eun [Gyeongsang National University School of Medicine and Gyeongsang National University Hospital, Jinju (Korea, Republic of); Cho, Su Beom; Ahn, Jong Hwa [Gyeongsang National University School of Medicine and Gyeongsang National University Changwon Hospital, Changwon (Korea, Republic of)

    2017-08-15

    A 60-year-old lean man with claudication due to severe stenosis of the right common iliac artery (CIA) underwent balloon-expandable stent deployment. Nineteen months later, claudication and lower limb ischemia in the patient recurred after minor external pressure and computed tomography indicated collapse of the right CIA stent. We performed balloon angioplasty again and self-expandable stent deployment was performed, and the patient's symptoms were relieved. We suggest that the CIA in a lean person could be susceptible to external pressure.

  20. High n ballooning modes in highly elongated tokamaks

    International Nuclear Information System (INIS)

    An, C.H.; Bateman, G.

    1980-02-01

    An analytic study of stability against high n ballooning modes in highly elongated axisymmetric plasmas is presented and compared with computational results. From the equation for the marginal pressure gradient, it is found that the local shear plays an important role on the stability of elongated and shifted plasma, and that high elongation deteriorates the stability by decreasing the stabilizing effects of field line bending and local shear. The net contribution of the local shear to stability decreases with elongation and shift for strongly ballooning modes (eigenfunctions strongly localized near the outer edge of the toroidal flux surfaces) but increases for interchange modes (eigenfunctions more uniform along the flux surfaces). The computational study of high n ballooning modes in a highly elongated plasma reveals that lowering the aspect ratio and broadening the pressure profile enhance the marginal beta for β/sub p/ less than unity but severely reduce the marginal beta for β/sub p/ larger than unity

  1. Review of the British scientific sounding rocket and balloon programmes

    International Nuclear Information System (INIS)

    Delury, J.T.

    1978-01-01

    This review describes the UK scientific sounding rocket programmes which have utilised Skylarks for 21 years, Petrels for 10 years and Fulmars for 2 years. The SRC's ongoing programme is now based on the Petrel and Fulmar rockets, and approved proposals by 5 UK scientific groups covering 1978 and 1979 are outlined. The British scientific balloon programme, which serves 14 scientific groups within UK universities, involves a planned 10 flights per annum using balloons of 3 M cu ft to 31 M cu ft capacity and payloads up to 2 tons in weight. The review outlines the balloon programme of flights planned mainly from Palestine in Texas and Alice Springs/Mildura in Australia. (author)

  2. Popping balloons: formation of a crack network in rubber membranes

    Science.gov (United States)

    Moulinet, Sebastien; Adda-Bedia, Mokhtar; Equipe Morphogenèse et phénomènes multi-échelle Team

    2015-03-01

    Everyone can make the observation: a rubber balloon inflated until it spontaneously pop breaks into a large number of shreds. In contrast, a balloon pierced with a needle at an early stage of its inflation breaks into two large pieces. Using model latex balloons, we have experimentally investigated the transition between these two breaking regimes. We have showed that, above a threshold stress in the latex membrane, a single crack become unstable and separates into two new cracks. Then, a cascade of tip-splitting generates a network of cracks that eventually form a large number of fragments. We have observed that the instability of the crack occurs when it reaches a limit velocity that could the speed of sound. By studying the energy balance during the explosion, we can determine the intrinsic fracture energy of rubber, a measurement difficult to achieve with usual tensile testing.

  3. JUBA (Joint UAS-Balloon Activities) Final Campaign Report.

    Energy Technology Data Exchange (ETDEWEB)

    Dexheimer, Darielle [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Apple, Monty [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Callow, Diane Schafer [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Longbottom, Casey Michael [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Novick, David K. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Wilson, Christopher W. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2018-02-01

    Using internal investment funds within Sandia National Laboratories’ (SNL) Division 6000, JUBA was a collaborative exercise between SNL Orgs. 6533 & 6913 (later 8863) to demonstrate simultaneous flights of tethered balloons and UAS on the North Slope of Alaska. JUBA UAS and tethered balloon flights were conducted within the Restricted Airspace associated with the ARM AMF3 site at Oliktok Point, Alaska. The Restricted Airspace occupies a 2 nautical mile radius around Oliktok Point. JUBA was conducted at the Sandia Arctic Site, which is approximately 2 km east-southeast of the AMF3. JUBA activities occurred from 08/08/17 – 08/10/17. Atmospheric measurements from tethered balloons can occur for a long duration, but offer limited spatial variation. Measurements from UAS could offer increased spatial variability.

  4. Absence of Bacteria on Coronary Angioplasty Balloons from Unselected Patients

    DEFF Research Database (Denmark)

    Hansen, Gorm Mørk; Nilsson, Martin; Nielsen, Claus Henrik

    2015-01-01

    , and translocation of bacteria from the oral cavity to the coronary arteries may play a role in the development of coronary artery disease. Very few studies have used angioplasty balloons for in vivo sampling from diseased coronary arteries, and with varying results. Therefore, the aim of this study was to assess...... if bacterial DNA from primarily oral bacteria could be detected on coronary angioplasty balloons by use of an optimized sampling process combined with an internally validated sensitive polymerase chain reaction (PCR) assay. Coronary angioplasty balloons and control samples from a total of 45 unselected...... patients with stable angina, unstable angina/non-ST elevation myocardial infarction, and ST-elevation myocardial infarction (n = 15 in each group) were collected and analyzed using a PCR assay with high sensitivity and specificity for 16S rRNA genes of the oral microbiome. Despite elimination of extraction...

  5. Iridium: Global OTH data communications for high altitude scientific ballooning

    Science.gov (United States)

    Denney, A.

    While the scientific community is no stranger to embracing commercially available technologies, the growth and availability of truly affordable cutting edge technologies is opening the door to an entirely new means of global communications. For many years high altitude ballooning has provided science an alternative to costly satellite based experimental platforms. As with any project, evolution becomes an integral part of development. Specifically in the NSBF ballooning program, where flight durations have evolved from the earlier days of hours to several weeks and plans are underway to provide missions up to 100 days. Addressing increased flight durations, the harsh operational environment, along with cumbersome and outdated systems used on existing systems, such as the balloon vehicles Support Instrumentation Package (SIP) and ground-based systems, a new Over-The-Horizon (OTH) communications medium is sought. Current OTH equipment planning to be phased-out include: HF commanding systems, ARGOS PTT telemetry downlinks and INMARSAT data terminals. Other aspects up for review in addition to the SIP to utilize this communications medium include pathfinder balloon platforms - thereby, adding commanding abilities and increased data rates, plus providing a package for ultra-small experiments to ride aloft. Existing communication systems employed by the National Scientific Balloon Facility ballooning program have been limited not only by increased cost, slow data rates and "special government use only" services such as TDRSS (Tracking and Data Relay Satellite System), but have had to make special provisions to geographical flight location. Development of the Support Instrumentation Packages whether LDB (Long Duration Balloon), ULDB (Ultra Long Duration Balloon) or conventional ballooning have been plagued by non-standard systems configurations requiring additional support equipment for different regions and missions along with a myriad of backup for redundancy. Several

  6. Blood pressure normalization post-jugular venous balloon angioplasty.

    Science.gov (United States)

    Sternberg, Zohara; Grewal, Prabhjot; Cen, Steven; DeBarge-Igoe, Frances; Yu, Jinhee; Arata, Michael

    2015-05-01

    This study is the first in a series investigating the relationship between autonomic nervous system dysfunction and chronic cerebrospinal venous insufficiency in multiple sclerosis patients. We screened patients for the combined presence of the narrowing of the internal jugular veins and symptoms of autonomic nervous system dysfunction (fatigue, cognitive dysfunction, sleeping disorders, headache, thermal intolerance, bowel/bladder dysfunction) and determined systolic and diastolic blood pressure responses to balloon angioplasty. The criteria for eligibility for balloon angioplasty intervention included ≥ 50% narrowing in one or both internal jugular veins, as determined by the magnetic resonance venography, and ≥ 3 clinical symptoms of autonomic nervous system dysfunction. Blood pressure was measured at baseline and post-balloon angioplasty. Among patients who were screened, 91% were identified as having internal jugular veins narrowing (with obstructing lesions) combined with the presence of three or more symptoms of autonomic nervous system dysfunction. Balloon angioplasty reduced the average systolic and diastolic blood pressure. However, blood pressure categorization showed a biphasic response to balloon angioplasty. The procedure increased blood pressure in multiple sclerosis patients who presented with baseline blood pressure within lower limits of normal ranges (systolic ≤ 105 mmHg, diastolic ≤ 70 mmHg) but decreased blood pressure in patients with baseline blood pressure above normal ranges (systolic ≥ 130 mmHg, diastolic ≥ 80 mmHg). In addition, gender differences in baseline blood pressure subcategories were observed. The coexistence of internal jugular veins narrowing and symptoms of autonomic nervous system dysfunction suggests that the two phenomena may be related. Balloon angioplasty corrects blood pressure deviation in multiple sclerosis patients undergoing internal jugular vein dilation. Further studies should investigate the

  7. Balloon Angioplasty for Native Coarctation of the Aorta in Children: Immediate Outcome and Follow-up for Heart Function

    Directory of Open Access Journals (Sweden)

    Hamid Amoozgar

    2017-03-01

    Full Text Available Background: The effect of balloon angioplasty in treatment of coarctation of the aorta (COA in pediatric patients is very important. Objectives: This study aimed to assess the efficacy and safety of balloon angioplasty for coarctation of the aorta (CoA and its effects on heart function in children above 3 months of age. Patients and Methods: In this retrospective study, we reviewed the immediate outcomes of 100 consecutive pediatric patients above 3 months of age with native CoA who were treated by balloon angioplasty at a tertiary pediatric heart center from June 2002 to August 2012. The patients were followed by echocardiography. Statistical analyses were performed by descriptive statistics using the SPSS statistical software, version 20 and the significance level was set at 0.05. Results: The patients’ ages ranged from 4 months to 15 years, with the mean of 51.56 ± 42.22 months. Additionally, their body weight ranged from 4 to 63 kg (mean: 15.44 ± 10.62 kg at the time of CoA repair. Technical success of balloon dilation was achieved in 91/95 patients (95.7%. Besides, systolic gradient significantly reduced from 48.29 ± 21.62 mmHg (range 7 - 82 mmHg to 13.21 ± 9.96 mmHg (range 0 - 34 mmHg (P 15. Conclusions: Percutaneous balloon angioplasty was a safe and effective treatment option for native CoA in the children above 3 months old. However, impairment of LV diastolic function should be mentioned as an important issue in long-term follow-up.

  8. Particle Astrophysics in NASA's Long Duration Balloon Program

    Energy Technology Data Exchange (ETDEWEB)

    Gorham, Peter W.

    2013-10-15

    A century after Viktor Hess' discovery of cosmic rays, balloon flights still play a central role in the investigation of cosmic rays over nearly their entire spectrum. We report on the current status of NASA balloon program for particle astrophysics, with particular emphasis on the very successful Antarctic long-duration balloon program, and new developments in the progress toward ultra-long duration balloons.

  9. Properties of nylon 12 balloons after thermal and liquid carbon dioxide treatments.

    Science.gov (United States)

    Ro, Andrew J; Davé, Vipul

    2013-03-01

    Critical design attributes of angioplasty balloons include the following: tear resistance, high burst pressures, controlled compliance, and high fatigue. Balloons must have tear resistance and high burst pressures because a calcified stenosis can be hard and nominal pressures of up to 16 atm can be used to expand the balloon. The inflated balloon diameter must be a function of the inflation pressure, thus compliance is predictable and controlled. Reliable compliance is necessary to prevent damage to vessel walls, which may be caused by over-inflation. Balloons are often inflated multiple times in a clinical setting and they must be highly resistant to fatigue. These design attributes are dependent on the mechanical properties and polymer morphology of the balloon. The effects of residual stresses on shrinkage, crystallite orientation, balloon compliance, and mechanical properties were studied for angioplasty nylon 12 balloons. Residual stresses of these balloons were relieved by oven heat treatment and liquid CO2 exposure. Residual stresses were measured by quantifying shrinkage at 80 °C of excised balloon samples using a dynamic mechanical analyzer. Shrinkage was lower after oven heat treatment and liquid CO2 exposure compared to the as-received balloons, in the axial and radial directions. As-received, oven heat treated, and liquid CO2-exposed balloon samples exhibited similar thermal properties (T(g), T(m), X(t)). Crystallite orientation was not observed in the balloon cylindrical body using X-ray scattering and polarized light microscopy, which may be due to balloon fabrication conditions. Significant differences were not observed between the stress-strain curves, balloon compliance, and average burst pressures of the as-received, oven heat treated, and liquid CO2-exposed balloons. Copyright © 2012 Elsevier B.V. All rights reserved.

  10. Transantral, endoscopically guided balloon dilatation of the ostiomeatal complex for chronic rhinosinusitis under local anesthesia.

    Science.gov (United States)

    Stankiewicz, James; Tami, Thomas; Truitt, Theodore; Atkins, James; Liepert, Douglas; Winegar, Bradford

    2009-01-01

    A multicenter study (BREATHE I - Entellus Medical, Inc.) was performed to assess the safety and outcomes of a new, less invasive system that uses direct endoscopic visualization to facilitate balloon dilation of the maxillary sinus ostia and ethmoid infundibulum. General anesthesia was avoided in most subjects to assess feasibility of performing transantral ostial dilatation in an office setting. Subjects with chronic rhinosinusitis of the maxillary sinuses alone or maxillary and anterior ethmoid sinuses underwent baseline evaluation including CT imaging and symptom assessment using the Sino-Nasal Outcome Test (SNOT 20). Subjects underwent transantral balloon dilation and follow-up evaluation at 1 week, 3 months, and 6 months post-procedure. Thirty subjects were treated at three centers. Fifty-five of 58 maxillary ostia were successfully treated for a procedural completion rate of 94.8%. Ninety-seven percent of the procedures were completed under local anesthesia with or without minimal intravenous sedation. There were no device-related serious adverse events or unanticipated adverse device effects. The mean overall SNOT 20 score at baseline was 2.9 +/- 1.0. Mean overall SNOT 20 scores at 1-week, 3-month, and 6-month follow-up were 0.8 +/- 0.8, 0.7 +/- 0.8, and 0.8 +/- 0.9 respectively. Patency at 3-months as confirmed by CT imaging was 95.8%. These results indicate that transantral balloon dilation of the ostiomeatal complex under local anesthesia appears to be a safe technique for managing isolated maxillary or maxillary and anterior ethmoid sinusitis and can potentially be performed safely in an office setting.

  11. AIAA Educator Academy: The Space Weather Balloon Module

    Science.gov (United States)

    Longmier, B.; Henriquez, E.; Bering, E. A.; Slagle, E.

    2013-12-01

    Educator Academy is a K-12 STEM curriculum developed by the STEM K-12 Outreach Committee of the American Institute of Aeronautics and Astronautics (AIAA). Consisting of three independent curriculum modules, K-12 students participate in inquiry-based science and engineering challenges to improve critical thinking skills and enhance problem solving skills. The Space Weather Balloon Curriculum Module is designed for students in grades 9-12. Throughout this module, students learn and refine physics concepts as well as experimental research skills. Students participate in project-based learning that is experimental in nature. Students are engaged with the world around them as they collaborate to launch a high altitude balloon equipped with HD cameras.The program leaders launch high altitude weather balloons in collaboration with schools and students to teach physics concepts, experimental research skills, and to make space exploration accessible to students. A weather balloon lifts a specially designed payload package that is composed of HD cameras, GPS tracking devices, and other science equipment. The payload is constructed and attached to the balloon by the students with low-cost materials. The balloon and payload are launched with FAA clearance from a site chosen based on wind patterns and predicted landing locations. The balloon ascends over 2 hours to a maximum altitude of 100,000 feet where it bursts and allows the payload to slowly descend using a built-in parachute. The payload is located using the GPS device. In April 2012, the Space Weather Balloon team conducted a prototype field campaign near Fairbanks Alaska, sending several student-built experiments to an altitude of 30km, underneath several strong auroral displays. To better assist teachers in implementing one or more of these Curriculum Modules, teacher workshops are held to give teachers a hands-on look at how this curriculum is used in the classroom. And, to provide further support, teachers are each

  12. Cloud Water Content Sensor for Sounding Balloons and Small UAVs

    Science.gov (United States)

    Bognar, John A.

    2009-01-01

    A lightweight, battery-powered sensor was developed for measuring cloud water content, which is the amount of liquid or solid water present in a cloud, generally expressed as grams of water per cubic meter. This sensor has near-zero power consumption and can be flown on standard sounding balloons and small, unmanned aerial vehicles (UAVs). The amount of solid or liquid water is important to the study of atmospheric processes and behavior. Previous sensing techniques relied on strongly heating the incoming air, which requires a major energy input that cannot be achieved on sounding balloons or small UAVs.

  13. Cosmic ray abundance measurements with the CAKE balloon experiment

    CERN Document Server

    Cecchini, S.; Giacomelli, G.; Manzoor, S.; Medinaceli, E.; Patrizii, L.; Togo, V.

    2005-01-01

    We present the results from the CAKE (Cosmic Abundance below Knee Energy) balloon experiment which uses nuclear track detectors. The final experiment goal is the determination of the charge spectrum of CR nuclei with Z $>$ 30 in the primary cosmic radiation. The detector, which has a geometric acceptance of $\\sim$ 1.7 m$^2$sr, was exposed in a trans-mediterranean stratospheric balloon flight. Calibrations of the detectors used (CR39 and Lexan), scanning strategies and algorithms for tracking particles in an automatic mode are presented. The present status of the results is discussed

  14. Polymer blends for LDB applications. [Long Duration Ballooning

    Science.gov (United States)

    Lichkus, Andrew M.; Harrison, Ian R.

    1991-01-01

    A series of LCP/PE blends have been studied to determine the potential of such systems to produce a high modulus balloon film material which retains the balloon fabrication and low temperature flight advantages of the current PE films. Blown films of blends of 5 and 15 percent LCP in PE have been produced which show a 28 percent enhancement in modulus over the neat PE matrix. These results are substantially lower than anticipated and are explained in terms of the LCP reinforcement aspect ratio and fibril diameter.

  15. Emerging Stent and Balloon Technologies in the Femoropopliteal Arteries

    Directory of Open Access Journals (Sweden)

    Georgios Pastromas

    2014-01-01

    Full Text Available Endovascular procedures for the management of the superficial femoral (SFA and popliteal artery disease are increasingly common. Over the past decade, several stent technologies have been established which may offer new options for improved clinical outcomes. This paper reviews the current evidence for SFA and popliteal artery angioplasty and stenting, with a focus on randomized trials and registries of nitinol self-expanding stents, drug-eluting stents, dug-coated balloons, and covered stent-grafts. We also highlight the limitations of the currently available data and the future routes in peripheral arterial disease (PAD stent and balloon technology.

  16. Membrane-like structure in the urinary bladder neck of a young cat: diagnosis and treatment using balloon dilatation and a balloon-expandable metallic stent

    Directory of Open Access Journals (Sweden)

    Matias Ruiz-Drebing

    2017-10-01

    Full Text Available Case summary A 33-month-old, spayed female domestic shorthair cat was referred to the Animal Health Trust for the investigation of urinary incontinence and straining to urinate. A membrane-like structure was detected in the bladder neck, which caused partial obstruction of the urinary bladder. A combination of different imaging techniques, including ultrasonography, radiography, CT and fluoroscopy, was essential in the diagnosis, surgical planning and treatment of this intravesicular stricture. During retrograde vaginourethrocystogram, unexpected subcapsular accumulation of contrast medium was seen around both kidneys on radiographs and confirmed with CT. Three different treatments were performed, including surgical debridement, balloon dilatation and placement of a self-expanding metallic stent across the stricture. Histopathology of the membrane was unable to differentiate whether the lesion was congenital or acquired. No urinary incontinence was observed 5 months after placement of the metallic stent. Relevance and novel information This is the first reported case using fluoroscopic-guided balloon dilatation of the bladder neck for the treatment of a bladder neck stricture. Presence of renal subcapsular contrast medium secondary to a retrograde vaginourethrocystogram due to partial obstruction at the bladder neck in a cat has not been previously described.

  17. Widget: A data acquisition system for a balloon borne Si particle calorimeter

    International Nuclear Information System (INIS)

    Colavita, A.; Aversa, F.; Venkataraman, S.; Battaiotto, P.

    1993-04-01

    We describe Widget; a complete data acquisition system (DAS) designed for a balloon-borne calorimeter using silicon strip detectors. The design includes a general purpose CPU as well as five to twenty Digital Signal Processors in order to control the acquisition of the data. This local intelligence also allows the instrument to re-calibrate itself, to perform calculations on the data and to control the functionality of the instrumentation. The DSPs filter the data to avoid overflowing the radio link to ground. In principle the system could control the instruments, without direct intervention from the ground, on flights with durations of several days. (author). 7 refs, 2 figs

  18. BioEnterics Intragastric Balloon (BIB) versus Spatz Adjustable Balloon System (ABS): Our experience in the elderly.

    Science.gov (United States)

    Russo, Teresa; Aprea, Giovanni; Formisano, Cesare; Ruggiero, Simona; Quarto, Gennaro; Serra, Raffaele; Massa, Guido; Sivero, Luigi

    2017-02-01

    The BioEnterics Intragastric Balloon (BIB) and the Spatz Adjustable Balloon System (ABS) are in fact recommended for weight reduction as a bridge to bariatric surgery. We retrospected studied patients with body mass index (BMI) and age ranges of 37-46 and 70-80 years, respectively, who had undergone BIB from January 2010 to July 2012 and prospected studied patients who had undergone Spatz balloon from July 2012 to August 2014. The aim of this study is to compare BIB and Spatz in terms of weight loss, complications, and maintenance of weight after removal. For both procedures, the median weight loss was 20 ± 3 kg, median BMI at the end of the therapy was 32 ± 2, and no severe complication occurred. Copyright © 2016 IJS Publishing Group Ltd. Published by Elsevier Ltd. All rights reserved.

  19. A cooled intraesophageal balloon to prevent thermal injury during endocardial surgical radiofrequency ablation of the left atrium: a finite element study

    Energy Technology Data Exchange (ETDEWEB)

    Berjano, Enrique J [Center for Research and Innovation on Bioengineering, Valencia Polytechnic University, Camino de Vera s/n, 46022 Valencia (Spain); Hornero, Fernando [Cardiac Surgery Department, Valencia University General Hospital, Avd Tres Cruces s/n, 46014, Valencia (Spain)

    2005-10-21

    Recent clinical studies on intraoperative monopolar radiofrequency ablation of atrial fibrillation have reported some cases of injury to the esophagus. The aim of this study was to perform computer simulations using three-dimensional finite element models in order to investigate the feasibility of a cooled intraesophageal balloon appropriately placed to prevent injury. The models included atrial tissue and a fragment of esophagus and lung linked by connective tissue. The lesion depth in the esophagus was assessed using a 50 deg. C isotherm and expressed as a percentage of thickness of the esophageal wall. The results are as follows: (1) chilling the esophagus by means of a cooled balloon placed in the lumen minimizes the lesion in the esophageal wall compared to the cases in which no balloon is used (a collapsed esophagus) and with a non-cooled balloon; (2) the temperature of the cooling fluid has a more significant effect on the minimization of the lesion than the rate of cooling (the thermal transfer coefficient for forced convection); and (3) pre-cooling periods previous to RF ablation do not represent a significant improvement. Finally, the results also suggest that the use of a cooled balloon could affect the transmurality of the atrial lesion, especially in the cases where the atrium is of considerable thickness. (note)

  20. Comparative dosimetry in intracavitary balloon catheter brachytherapy with I-125 and in Cf-252 brachytherapy combined with BNCT for brain tumors

    Directory of Open Access Journals (Sweden)

    Samia de Freitas Brandao

    2013-07-01

    Full Text Available Objective Comparative analysis of dosimetry in intracavitary balloon catheter brachytherapy with I-125 and in Cf-252 brachytherapy combined with BNCT for treatment of brain tumors. Materials and Methods Simulations of intracavitary balloon catheter brachytherapy with I-125 and in Cf-252 brachytherapy combined with BNCT were performed with the MCNP5 code, modeling the treatment of a brain tumor on a voxel computational phantom representing a human head. Absorbed dose rates were converted into biologically weighted dose rates. Results Intracavitary balloon catheter brachytherapy with I-125 produced biologically weighted mean dose rates of 3.2E-11, 1.3E-10, 1.9E-11 and 6.9E-13 RBE.Gy.h-1.p-1.s, respectively, on the healthy tissue, on the balloon periphery and on the I 1 and I 2 tumor infiltration zones. On the other hand, Cf-252 brachytherapy combined with BNCT produced a biologically weighted mean dose rate of 5.2E-09, 2.3E-07, 8.7E-09 and 2.4E-09 RBE.Gy.h-1.p-1.s, respectively on the healthy tissue, on the target tumor and on the I 1 and I 2 infiltration zones. Conclusion Cf-252 brachytherapy combined with BNCT delivered a selective irradiation to the target tumor and to infiltration zones, while intracavitary balloon catheter brachytherapy with I-125 delivered negligible doses on the tumor infiltration zones.

  1. Comparative dosimetry in intracavitary balloon catheter brachytherapy with I-125 and in Cf-252 brachytherapy combined with BNCT for brain tumors

    Energy Technology Data Exchange (ETDEWEB)

    Brandao, Samia de Freitas, E-mail: samiabrandao@gmail.com [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Departamento de Engenharia Nuclear; Campos, Tarcisio Passos Ribeiro de [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil)

    2013-06-15

    Objective: comparative analysis of dosimetry in intracavitary balloon catheter brachytherapy with I-125 and in Cf-252 brachytherapy combined with BNCT for treatment of brain tumors. Materials and methods: simulations of intracavitary balloon catheter brachytherapy with I-125 and in Cf-252 brachytherapy combined with BNCT were performed with the MCNP5 code, modeling the treatment of a brain tumor on a voxel computational phantom representing a human head. Absorbed dose rates were converted into biologically weighted dose rates. Results: intracavitary balloon catheter brachytherapy with I-125 produced biologically weighted mean dose rates of 3.2E-11, 1.3E-10, 1.9E-11 and 6.9E-13 RBE.Gy.h{sup -1}.p{sup -1}.s, respectively, on the healthy tissue, on the balloon periphery and on the /{sub 1} and /{sub 2} tumor infiltration zones. On the other hand, Cf-252 brachytherapy combined with BNCT produced a biologically weighted mean dose rate of 5.2E-09, 2.3E-07, 8.7E-09 and 2.4E-09 RBE.Gy.h{sup -1}.p{sup -1}.s, respectively on the healthy tissue, on the target tumor and on the /{sub 1} and /{sub 2} infiltration zones. Conclusion: Cf-252 brachytherapy combined with BNCT delivered a selective irradiation to the target tumor and to infiltration zones, while intracavitary balloon catheter brachytherapy with I-125 delivered negligible doses on the tumor infiltration zones. (author)

  2. Sinus procedures in the Medicare population from 2000 to 2014: A recent balloon sinuplasty explosion.

    Science.gov (United States)

    Calixto, Nathaniel E; Gregg-Jaymes, Twyla; Liang, Jonathan; Jiang, Nancy

    2017-09-01

    To describe sinus procedure trends from 2000 to 2014, particularly following the introduction of balloon sinuplasty Common Procedural Technology (CPT) codes in 2011. Retrospective review of Medicare billing data available to the public. Procedure and beneficiary data from 2000 to 2014 and provider data from 2012 to 2014 were obtained online from the Centers for Medicare and Medicaid Services. Sinus CPT codes were classified as balloon sinus procedure (BSP) or nonballoon sinus procedure (nBSP). Providers billing for sinus procedures were categorized as BSP only, nBSP only, or both. For comparison, data on septoplasty procedures from 2000 to 2014 were obtained. From 2000 to 2014, the total number of sinus procedures per 10 thousand beneficiaries (PP10K) nationwide increased by 3.7% annually. From 2011 to 2014, nBSP PP10K decreased by 3.1% annually, and BSP PP10K increased by 59% annually. Septoplasty PP10K changed by 2000 and 2014. States with the highest BSP PP10K from 2012 to 2014 were Kansas, Texas, and Louisiana. Providers performing sinus procedures increased by 30.9% from 2012 to 2014. There was a 244% increase in BSP-only providers, a 0.7% increase in nBSP-only providers, and an 83.3% increase in providers using both. Septoplasty providers increased by 4.1%. Although the total number of sinus procedures increased from 2000 to 2014, the number of BSP increased at a substantially greater rate since the introduction of CPT codes for these procedures in 2011. Nationwide increases in sinus providers were driven by new providers performing balloon-guided procedures. 4. Laryngoscope, 127:1976-1982, 2017. © 2017 The American Laryngological, Rhinological and Otological Society, Inc.

  3. Remodeling of the aortic neck with a balloon-expandable stent graft in patients with complicated neck morphology.

    Science.gov (United States)

    Kolvenbach, Ralf; Pinter, Laslo; Cagiannos, Catherine; Veith, Frank J

    2008-01-01

    Graft migration and other device-related problems are more frequent in abdominal aortic aneurysm (AAA) patients with a complicated neck. We wanted to evaluate the performance of a balloon-expandable stent graft in these cases. Complicated aortic neck morphology was defined as a combination of short (45 degrees) necks with or without circumferential thrombus. Severe aortic angulation was defined as less than 120 degrees. During a 24-month period, 18 consecutive patients with complicated neck anatomy were treated with the Vascular Innovations (VI)-Datascope balloon-expandable endograft. In two patients, a balloon-expandable cuff was implanted to remodel the neck prior to insertion of a bifurcated endograft (Excluder, W.L. Gore & Associates, Flagstaff, AZ). Demographic, procedural, and outcome data were collected prospectively and retrospectively analyzed. All patients had preoperative computed tomographic (CT) angiography to determine aortic neck angulation and were followed with duplex ultrasonography and CT every 3 and 6 months postoperatively to assess aortic neck and sac dilatation, as well as device migration. The VI-Datascope graft consists of an aortounifemoral polytetrafluoroethylene (PTFE) graft sutured to a proximal balloon-expandable stent. The length of the graft is 40 cm; thus, the distal end of the graft always protrudes through the ipsilateral arteriotomy and can be cut to an appropriate length for each patient. The covered portion of the graft was deployed just below the level of the lowest renal artery. The proximal bare metal stent was deployed in the suprarenal area. An endoluminal hand-sewn anastomosis was performed between the aortounifemoral limb and the distal external iliac or the common femoral arteries. An occluder device was placed in the contralateral common iliac artery to prevent retrograde perfusion of the aneurysm. A femorofemoral 8 mm Dacron graft bypass was then performed to establish flow to the contralateral extremity and pelvis

  4. Material Properties Analysis of Structural Members in Pumpkin Balloons

    Science.gov (United States)

    Sterling, W. J.

    2003-01-01

    The efficient design, service-life qualification, and reliability predictions for lightweight aerospace structures require careful mechanical properties analysis of candidate structural materials. The demand for high-quality laboratory data is particularly acute when the candidate material or the structural design has little history. The pumpkin-shaped super-pressure balloon presents both challenges. Its design utilizes load members (tendons) extending from apex to base around the gas envelope to achieve a lightweight structure. The candidate tendon material is highly weight-efficient braided HM cord. Previous mechanical properties studies of Zylon have focused on fiber and yarn, and industrial use of the material in tensile applications is limited. For high-performance polymers, a carefully plamed and executed properties analysis scheme is required to ensure the data are relevant to the desired application. Because no directly-applicable testing standard was available, a protocol was developed based on guidelines fiom professional and industry organizations. Due to the liquid-crystalline nature of the polymer, the cord is very stiff, creeps very little, and does not yield. Therefore, the key material property for this application is the breaking strength. The pretension load and gauge length were found to have negligible effect on the measured breaking strength over the ranges investigated. Strain rate was found to have no effect on breaking strength, within the range of rates suggested by the standards organizations. However, at the lower rate more similar to ULDB operations, the strength was reduced. The breaking strength increased when the experiment temperature was decreased from ambient to 183K which is the lowest temperature ULDB is expected to experience. The measured strength under all test conditions was well below that resulting from direct scale-up of fiber strength based on the manufacturers data. This expected result is due to the effects of the

  5. 28. Critical pulmonary valve stenosis: Medical management beyond balloon dilation

    Directory of Open Access Journals (Sweden)

    Muhammad Arif Khan

    2015-10-01

    Conclusion: Phentolamine and/or Captopril have a therapeutic role in neonates with critical PVS who remain oxygen dependent after balloon dilation. Both medicationslead to vasodilatation of pulmonary and systemic vascularity. They facilitate inflowto the right ventricle. Right to left shunt across a PFO or/ ASD minimizesand saturation improves leading to a significantreduction in length of hospitalization.

  6. Percutaneous transvenous angioplasty of inferior vena cava by balloon dilatation

    Energy Technology Data Exchange (ETDEWEB)

    Suh, Kyung Suk; Kim, Jae Kyu; Park, Jin Gyun; Kang, Heung Keun; Chung, Hyon De; Kim, Shin Kon; Chung, Sang Young [Chonnam National University College of Medicine, Kwangju (Korea, Republic of)

    1989-10-15

    3 patients with membranous (2 patients) and segmental (1 patient) obstruction of IVC were successfully treated by percutaneous transvenous angioplasty using balloon catheter. Improvements of clinical and radiological findings could be obtained after procedures. Relatively good patency was obtained in all cases without complications. This procedure can be applied safely to membranous or segmental obstructions of IVC and elsewhere in the venous systems.

  7. Meshed-Pumpkin Super-Pressure Balloon Design

    Science.gov (United States)

    Jones, Jack; Yavrouian, Andre

    2003-01-01

    An improved, lightweight design has been proposed for super-pressure balloons used to carry scientific instruments at high altitudes in the atmosphere of Earth for times as long as 100 days. [A super-pressure balloon is one in which the pressure of the buoyant gas (typically, helium) is kept somewhat above ambient pressure in order to maintain approximately constant density and thereby regulate the altitude.] The proposed design, called "meshed pumpkin," incorporates the basic concept of the pumpkin design, which is so named because of its appearance. The pumpkin design entails less weight than does a spherical design, and the meshed-pumpkin design would reduce weight further. The basic idea of the meshed-pumpkin design is to reinforce the membrane of a pumpkin balloon by attaching a strong, lightweight fabric mesh to its outer surface. The reinforcement would make it possible to reduce the membrane mass to one-third or less of that of the basic pumpkin design while retaining sufficient strength to enable the balloon to remain at approximately constant altitude for months.

  8. Balloon test project: Cosmic Ray Antimatter Calorimeter (CRAC)

    Science.gov (United States)

    Christy, J. C.; Dhenain, G.; Goret, P.; Jorand, J.; Masse, P.; Mestreau, P.; Petrou, N.; Robin, A.

    1984-01-01

    Cosmic ray observations from balloon flights are discussed. The cosmic ray antimatter calorimeter (CRAC) experiment attempts to measure the flux of antimatter in the 200-600 Mev/m energy range and the isotopes of light elements between 600 and 1,000 Mev/m.

  9. Achilles tests finally nail PWR fuel clad ballooning fears

    International Nuclear Information System (INIS)

    Dore, P.; McMinn, K.

    1992-01-01

    A conclusive series of experiments carried out by AEA Reactor Services at its Achilles rig in the UK has finally allayed fears that fuel clad ballooning is a major safety problem for Sizewell B, Britain's first Pressurized Water Reactor. The experiments are described in this article. (author)

  10. Balloon dilatation of isolated severe tricuspid valve stenosis

    Directory of Open Access Journals (Sweden)

    Rajeev Bhardwaj

    2015-12-01

    Full Text Available Tricuspid valve stenosis is mostly rheumatic in origin. It almost always occurs in association with mitral valve disease. There are only few case reports of isolated tricuspid valve stenosis. We report a case of isolated tricuspid valve stenosis, which was treated with balloon dilatation.

  11. Balloon dilatation of isolated severe tricuspid valve stenosis

    OpenAIRE

    Bhardwaj, Rajeev; Sharma, Rajesh

    2015-01-01

    Tricuspid valve stenosis is mostly rheumatic in origin. It almost always occurs in association with mitral valve disease. There are only few case reports of isolated tricuspid valve stenosis. We report a case of isolated tricuspid valve stenosis, which was treated with balloon dilatation.

  12. [Expansion dilatation balloons for cervical ripening in obstetric practice].

    Science.gov (United States)

    Ducarme, G; Grange, J; Vital, M

    2016-02-01

    During recent decades, mechanical devices have been substituted by pharmacological methods. Their place in the therapeutic arsenal remains important with a renewed obstetrical interest for these devices. Due to a lack of data they are still not recommended as first-line. This review thus attempted to examine the use of expansion dilatation balloons (Foley catheter and double-balloons) to analyze their effectiveness in case of native uterus and previous cesarean section. Twenty-seven clinical trials had compared balloons catheter and prostaglandins in patients without a history of uterine scar. The risk of cesarean section did not differ. Mechanical methods seemed to be more effective in achieving delivery within 24hours, with fewer episodes of excessive uterine contractions, but they necessitated more oxytocin during labor. Ten clinical trials analyzed dilatation balloons in patients with previous cesarean section. More than 70% women had favorable cervical ripening (Bishop score>6), and vaginal delivery was reported between 35 and 70% of patients. The risk of uterine rupture was low between 0.64 and 0.72%, with neither increased risk of severe neonatal and maternal morbidity nor increased risk of infectious morbidity. Mechanical methods are effective and safe for third trimester cervical ripening, mainly in women with previous cesarean section. Potential advantages may include wide availability and reduction of some of the side effects. Copyright © 2015 Elsevier Masson SAS. All rights reserved.

  13. Critical appraisal of paclitaxel balloon angioplasty for femoral–popliteal arterial disease

    Directory of Open Access Journals (Sweden)

    Herten M

    2016-08-01

    Full Text Available Monika Herten,1 Giovanni B Torsello,1,2 Eva Schönefeld,3 Stefan Stahlhoff2 1Department of Vascular and Endovascular Surgery, University Hospital Münster, 2Department of Vascular Surgery, St Franziskus Hospital, Münster, 3Institute for Education and Student Affairs, University Hospital Münster, Münster, Germany Abstract: Peripheral arterial disease, particularly critical limb ischemia, is an area with urgent need for optimized therapies because, to date, vascular interventions often have limited life spans. In spite of initial encouraging technical success after femoropopliteal percutaneous transluminal angioplasty or stenting, postprocedural restenosis remains the major problem. The challenging idea behind the drug-coated balloon (DCB concept is the biological modification of the injury response after balloon dilatation. Antiproliferative drugs administered via DCBs or drug-eluting stents are able to suppress neointimal hyperplasia, the main cause of restenosis. This article reviews the results of DCB treatments of femoropopliteal and infrapopliteal lesions in comparison to standard angioplasty with uncoated balloons. A systematic literature search was performed in 1 medical journals (ie, MEDLINE, 2 international registers for clinical studies (ie, www.clinicaltrials.gov, and 3 abstracts of scientific sessions. Several controlled randomized trials with follow-up periods of up to 5 years demonstrated the efficacy of paclitaxel –DCB technology. However, calcified lesions seem to affect the efficacy of DCB. Combinations of preconditioning methods with DCBs showed promising results. Although the mechanical abrasion of calcium via atherectomy or laser ablation showed favorable periprocedural results, the long-term impact on restenosis and clinical outcome has to be demonstrated. Major advantages of the DCBs are the rapid delivery of drug at uniform concentrations with a single dose, their efficacy in areas wherein stents have been

  14. National Report on the NASA Sounding Rocket and Balloon Programs

    Science.gov (United States)

    Eberspeaker, Philip; Fairbrother, Debora

    2013-01-01

    The U. S. National Aeronautics and Space Administration (NASA) Sounding Rockets and Balloon Programs conduct a total of 30 to 40 missions per year in support of the NASA scientific community and other users. The NASA Sounding Rockets Program supports the science community by integrating their experiments into the sounding rocket payloads, and providing both the rocket vehicle and launch operations services. Activities since 2011 have included two flights from Andoya Rocket Range, more than eight flights from White Sands Missile Range, approximately sixteen flights from Wallops Flight Facility, two flights from Poker Flat Research Range, and four flights from Kwajalein Atoll. Other activities included the final developmental flight of the Terrier-Improved Malemute launch vehicle, a test flight of the Talos-Terrier-Oriole launch vehicle, and a host of smaller activities to improve program support capabilities. Several operational missions have utilized the new Terrier-Malemute vehicle. The NASA Sounding Rockets Program is currently engaged in the development of a new sustainer motor known as the Peregrine. The Peregrine development effort will involve one static firing and three flight tests with a target completion data of August 2014. The NASA Balloon Program supported numerous scientific and developmental missions since its last report. The program conducted flights from the U.S., Sweden, Australia, and Antarctica utilizing standard and experimental vehicles. Of particular note are the successful test flights of the Wallops Arc Second Pointer (WASP), the successful demonstration of a medium-size Super Pressure Balloon (SPB), and most recently, three simultaneous missions aloft over Antarctica. NASA continues its successful incremental design qualification program and will support a science mission aboard WASP in late 2013 and a science mission aboard the SPB in early 2015. NASA has also embarked on an intra-agency collaboration to launch a rocket from a balloon to

  15. Generalised ballooning theory of two-dimensional tokamak modes

    Science.gov (United States)

    Abdoul, P. A.; Dickinson, D.; Roach, C. M.; Wilson, H. R.

    2018-02-01

    In this work, using solutions from a local gyrokinetic flux-tube code combined with higher order ballooning theory, a new analytical approach is developed to reconstruct the global linear mode structure with associated global mode frequency. In addition to the isolated mode (IM), which usually peaks on the outboard mid-plane, the higher order ballooning theory has also captured other types of less unstable global modes: (a) the weakly asymmetric ballooning theory (WABT) predicts a mixed mode (MM) that undergoes a small poloidal shift away from the outboard mid-plane, (b) a relatively more stable general mode (GM) balloons on the top (or bottom) of the tokamak plasma. In this paper, an analytic approach is developed to combine these disconnected analytical limits into a single generalised ballooning theory. This is used to investigate how an IM behaves under the effect of sheared toroidal flow. For small values of flow an IM initially converts into a MM where the results of WABT are recaptured, and eventually, as the flow increases, the mode asymptotically becomes a GM on the top (or bottom) of the plasma. This may be an ingredient in models for understanding why in some experimental scenarios, instead of large edge localised modes (ELMs), small ELMs are observed. Finally, our theory can have other important consequences, especially for calculations involving Reynolds stress driven intrinsic rotation through the radial asymmetry in the global mode structures. Understanding the intrinsic rotation is significant because external torque in a plasma the size of ITER is expected to be relatively low.

  16. Prospective evaluation of an indwelling esophageal balloon dilatation feeding tube for treatment of benign esophageal strictures in dogs and cats.

    Science.gov (United States)

    Tan, Desmond K; Weisse, Chick; Berent, Allyson; Lamb, Kenneth E

    2018-03-01

    Despite multiple dilatation procedures, benign esophageal strictures (BES) remain a recurring cause of morbidity and mortality in dogs and cats. Investigate the use of an indwelling Balloon Dilatation esophagostomy tube (B-Tube) for treatment of BES in dogs and cats. Nine dogs and 3 cats. Animals with BES were recruited for our prospective study. Endoscopic and fluoroscopic evaluation of the esophagus and balloon dilatation were performed under general anesthesia, followed by placement of an indwelling B-Tube. The animals' owners performed twice daily at-home inflations for approximately 6 weeks. Repeat endoscopy was performed before B-Tube removal. Animals were reevaluated for changes in modified dysphagia score (MDS) after B-Tube removal. The B-Tube management was relatively well tolerated and effective in maintaining dilatation of a BES while in place. These animals underwent a median of 2 anesthetic episodes and were monitored for a median of 472 days (range, 358-1736 days). The mean MDS before treatment was 3.1 ± 0.5/4.0 and final follow-up MDS were significantly (P dog died. The B-Tube offers an effective, and more economical method, and often decreased anesthetic time to repeated balloon dilatation procedures for the treatment of BES in dogs and cats. Copyright © 2018 The Authors. Journal of Veterinary Internal Medicine published by Wiley Periodicals, Inc. on behalf of the American College of Veterinary Internal Medicine.

  17. Embolization of carotid-cavernous fistula using a silicone balloon and a tracker-catheter system

    International Nuclear Information System (INIS)

    Kim, Sun Yong; Cho, Kil Ho; Park, Bok Hwan

    1992-01-01

    With the recent introduction and development of the detachable balloon system, it has become the treatment of choice in the management of carotid cavernous fistulas(CCFs). But, since most delivery systems for embolization of CCF mainly depend on flow guidance for balloon delivery, in case of small fistula, pseudo aneurysm and arterialized venous collaterals, failure of balloon embolization can occur. To overcome these limitation, the authors designed and used a new versatile, steerable, and flow-guided detachable balloon system by using a Tracker catheter system with silicone or latex balloons. Using this maneuver, we could get successful fistula occlusion in 7 out of 8 patients (silicone balloon). But in one case, we had to occlude the internal carotid artery at the fistula site, proximal and distal cervical portions of the internal carotid artery. This balloon delivery system proved to provide high selectivity for fistula and relatively ease of handing

  18. Effectiveness of CO2-insufflated endoscopic submucosal dissection with the duodenal balloon occlusion method for early esophageal or gastric cancer: a randomized case control prospective study

    Directory of Open Access Journals (Sweden)

    Mori Hirohito

    2012-04-01

    Full Text Available Abstract Background Endoscopic submucosal dissection (ESD has typically been performed using air insufflation. Recently, however, insufflation of CO2 has been increasingly used to avoid complications. This prospective study was designed to compare the CO2 concentration, intestinal volume, and acid–base balance using the duodenal balloon procedure. Methods From June 2010 to February 2011, we enrolled 44 patients with esophageal or gastric cancer and randomly allocated them into two groups. We compared 22 patients undergoing CO2-insufflated ESD with a balloon placed into the duodenal bulb (duodenal balloon group and 22 patients undergoing regular CO2-insufflated ESD (regular group. Three-dimensional computed tomography was performed before and after the procedure to measure intestinal volume. CO2 concentrations were measured every 10 minutes. The visual analogue system (VAS scores for postoperative symptoms were recorded, and pH was measured immediately after the procedure. This was a prospective case control study randomized by the sealed envelope method. Results Intestinal CO2 gas volume before and after ESD was lower in the duodenal balloon group than in the regular group (P = 0.00027. The end-tidal CO2 level was significantly lower in the duodenal balloon group than in the regular group (P = 0.0001. No significant differences in blood ΔpH were found between the two groups. The VAS score for the occurrence of nausea due to abdominal distension after ESD indicated a significant difference (P = 0.031. Conclusions ESD using the duodenal balloon occlusion method is effective for reduction of post-ESD intestinal CO2 gas volume, resulting in a lower total amount of CO2 insufflation during ESD and reducing harmful influences on the human body to some extent.

  19. Height restoration and maintenance after treating unstable osteoporotic vertebral compression fractures by cement augmentation is dependent on the cement volume used.

    Science.gov (United States)

    Krüger, Antonio; Baroud, Gamal; Noriega, David; Figiel, Jens; Dorschel, Christine; Ruchholtz, Steffen; Oberkircher, Ludwig

    2013-08-01

    Two different procedures, used for percutaneous augmentation of vertebral compression fractures were compared, with respect to height restoration and maintenance after cyclic loading. Additionally the impact of the cement volume used was investigated. Wedge compression fractures were created in 36 human cadavaric vertebrae (T10-L3). Twenty-seven vertebrae were treated with the SpineJack® with different cement volumes (maximum, intermediate, and no cement), and 9 vertebrae were treated with Balloon Kyphoplasty. Vertebral heights were measured pre- and postfracture as well as after treatment and loading. Cyclic loading was performed with 10,000cycles (1Hz, 100-600N). The average anterior height after restoration was 85.56% for Kyphoplasty; 96.20% for SpineJack® no cement; 93.44% for SpineJack® maximum and 96% for the SpineJack® intermediate group. The average central height after restoration was 93.89% for Kyphoplasty; 100.20% for SpineJack® no cement; 99.56% for SpineJack® maximum and 101.13% for the SpineJack® intermediate group. The average anterior height after cyclic loading was 85.33 % for Kyphoplasty; 87.30% in the SpineJack® no cement, 92% in the SpineJack® maximum and 87% in the SpineJack® intermediate group. The average central height after cyclic loading was 92% for Kyphoplasty; 93.80% in the SpineJack® no cement; 98.56% in the SpineJack® maximum and 94.25% in the SpineJack® intermediate group. Height restoration was significantly better for the SpineJack® group compared to Kyphoplasty. Height maintenance was dependent on the cement volume used. The group with the SpineJack® without cement nevertheless showed better results in height maintenance, yet the statistical significance could not be demonstrated. Copyright © 2013 Elsevier Ltd. All rights reserved.

  20. Simple balloon dilation for drug-eluting in-stent restenosis: An optical coherent tomography analysis

    Energy Technology Data Exchange (ETDEWEB)

    Arikawa, Ryo [Division of Cardiology, Tenyoukai Central Hospital, Izumi-cho, Kagoshima City, Kagoshima (Japan); Yamaguchi, Hiroshi, E-mail: hyamaguchi@tsm.bbiq.jp [Division of Cardiology, Tenyoukai Central Hospital, Izumi-cho, Kagoshima City, Kagoshima (Japan); Takaoka, Junichiro; Miyamura, Akihiro; Atsuchi, Nobuhiko; Ninomiya, Toshiko; Atsuchi, Yoshihiko [Division of Cardiology, Tenyoukai Central Hospital, Izumi-cho, Kagoshima City, Kagoshima (Japan); Ohishi, Mitsuru [Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Science, Kagoshima University, Kagoshima (Japan); Terashima, Mitsuyasu [Department of Cardiology, Toyohashi Heart Center, Toyohashi (Japan); Kaneda, Hideaki [Okinaka Memorial Institute for Medical Research, Tokyo (Japan)

    2015-01-15

    Background: Although drug-eluting stent (DES) has significantly reduced restenosis, the treatment of DES-in-stent restenosis (ISR) remains a challenge with high restenosis rate. Methods: We examined whether morphologic appearance of restenosis tissue by optical coherent tomography (OCT) had an impact on outcomes after balloon angioplasty for DES-ISR. The morphologic appearance of restenosis tissue was qualitatively assessed for tissue structures such as homogeneous, layered, and heterogeneous patterns. Results: Using OCT, 50 patients with DES-ISR were divided into 2 groups: 25 lesions with homogeneous or layered patterns (homo/layered group) and 25 lesions with heterogeneous patterns (hetero group). Acute gain was larger in the hetero group (1.33 ± 0.41 mm vs. 1.06 ± 0.32 mm in the homo/layered group, P = 0.03). On intravascular ultrasound analysis, post-procedural percent neointimal area was smaller in the hetero group (27.4 ± 9.2% vs. 34.0 ± 11.2% in the homo/layered group, P = 0.05). Angiographic follow-up was performed in 37 lesions (74%). Follow-up minimal lumen diameter was larger in the hetero group (1.75 ± 0.89 mm vs. 1.01 ± 0.81 mm in the homo/layered group, P = 0.04). Target lesion revascularization rates tended to be lower in the hetero group (20% vs. 43% in the homo/layered group, P = 0.12). Conclusions: Balloon angioplasty was more effective for DES-ISR with heterogeneous tissue appearance than DES-ISR with homogeneous/layered tissue appearance. OCT assessment of DES-ISR morphology may be a useful adjunct in determining clinical strategies. Simple balloon dilatation is a possible treatment strategy for DES-ISR lesions with a heterogeneous appearance on OCT images.

  1. Percutaneous biliary stones removal using balloon sphincteroplasty and hydraulic pressure as primary therapeutic method

    International Nuclear Information System (INIS)

    Kim, Jae Soo; You, Jin Jong

    2005-01-01

    We wanted to report on the efficacy and safety of the percutaneous biliary stone removal technique using hydraulic pressure after balloon sphincteroplasty through the PTBD tract for patients with bile duct stones. The subjects of this study were 85 patients (46 men and 39 women) with bile duct stones who came to hospital over a period of the previous 4 years. All subjects had undergone attempts for with the biliary tree through PTBD. First, an 8-9F sheath was inserted into the biliary tree through the PTBD route by using a balloon catheter prior to sphincteroplasty, and 50cc of hydraulic pressure with contrast-mixed saline solution was then injected via the sheath. Follow-up cholangiogram was performed 1-3 days later to evaluate the results of stone removal. For residual stones, we attempted second, third, and fourth trials to completely remove the stones. The size and number of stones were analyzed. The results were analyzed, together with the complications, after classifying the cases as 'success', 'partial removal' or 'failure' according to the number of remaining stones. Out of 85 patients, 71 (83%) cases had successful results, and 43 (51%) cases resulted in success with the first attempt. The second, third and fourth trials were conducted on 16, 10 and 2 cases, respectively. Out of 14 failure cases, 10 patients had too many intrahepatic duct stones. The complications were abdominal pain (n=21), fever (n=9), and pancreatitis (n=2), and portal vein thrombosis, biloma and sepsis were also found in 1 case each. We report that this percutaneus biliary stone removal technique using hydraulic pressure after balloon sphincteroplasty through the PTBD is safe and effective, and particularly, it achieves good results as the primary therapy for treating only choledocholiths

  2. Laparoscopic management of a small bowel obstruction secondary to Elipse intragastric balloon migration: A case report

    Directory of Open Access Journals (Sweden)

    Saud Al-Subaie

    Full Text Available Introduction: The Elipse™ intragastric balloon (IGB for weight loss is a swallowable capsule that is filled with 550 mL of fluid and resides in the stomach for four months before being excreted from the gastrointestinal tract. Although initial data showed that use of this device is safe and free from serious complications, we report for the first time the successful management of an Elipse™ IGB-related adverse event. Presentation of case: A 41-year-old woman presented to our emergency department following two days of abdominal pain, vomiting, and constipation. Her medical history included four caesarean sections and insertion of the Elipse™ IGB 16 weeks prior to presentation. The patient was vitally stable at presentation and abdominal examination revealed a mildly distended abdomen. Plain X-ray revealed a small bowel obstruction (SBO, and a double contrast computed tomography scan showed a dilated small bowel with mild free fluid proximal to a transition zone at the distal jejunum. Laparoscopic enterotomy was performed just proximal to the obstruction site, and the balloon was visualized and extracted after it had been incised and emptied. The enterotomy incision was closed with an intracorporeal continuous absorbable suture. The patient’s recovery was uneventful and she was discharged on postoperative day 4. Discussion: We discuss the possible etiologies of SBO following Elipse™ IGB insertion, and present a brief literature review regarding surgical and nonsurgical management options for such cases. Conclusion: Although initial data showed the Elipse™ IGB to be safe, complications can occur and be managed successfully. Keywords: Elipse, Intragastric balloon, Capsule, Obesity, Case report

  3. SMILE-II: Balloon-Borne Telescope for Background-Suppressed Soft Gamma-Ray Imaging

    Science.gov (United States)

    Sawano, T.; Tanimori, T.; Kubo, H.; Takada, A.; Parker, J. D.; Mizumoto, T.; Sonoda, S.; Mizumura, Y.; Tomono, D.; Nakamura, K.; Matsuoka, Y.; Komura, S.; Sato, Y.; Nakamura, S.; Miuchi, K.; Kabuki, S.; Kishimoto, Y.; Kurosawa, S.; Iwaki, S.; Tanaka, M.; Ikeno, M.; Uchida, T.

    We have developed an Electron-Tracking Compton Camera (ETCC) for an all-sky survey at the MeV gamma-ray band. The ETCC consists of a gaseous tracker and a position sensitive scintillation camera to measure the momentum of the Compton-recoil electron and the scattering gamma ray so that we can reconstruct the energy and momentum of the incident gamma ray photon by photon. Also the ETCC has strong background rejection methods using tracking information such as the dE/dx particle identification and theCompton kinematics test. To confirm feasibility of observing celestial objects in space, we performed a balloon experiment to successfully observe the diffuse cosmic and atmospheric gamma rays, which confirmed the effectiveness of the background rejection capability. Based on the first balloon experiment result, we are developing a large ETCC and plan to launch it for the test of the imaging property. The performance of the SMILE-II ETCC is simulated and then it will obtain an effective area of 1.1 cm2 for 200 keV by improving the electron track reconstruction efficiency by a factor of about 10, which results in the detection of Crab nebula at >5σ level for several-hour observation in the middle latitude with an altitude of 40 km.

  4. Balloon-assisted percutaneous vertebroplasty in patients with osteoporotic compression fractures - first results

    International Nuclear Information System (INIS)

    Schulte, B.U.; Trompeter, M.; Remy, C.; Reimer, P.; Bruecher, D.

    2006-01-01

    Purpose: To determine the feasibility, efficacy and safety of balloon-assisted percutaneous vertebroplasty (BA-VP) in patients with osteoporotic vertebral compression fractures (VCFs). Materials and Methods: In 47 patients (29 women, 18 men; mean age: 70 years and 4 months) with severe VCFs, 66 BA-VPs were performed via a unipedicular access. After initial puncture (under combined fluoroscopy and CT guidance) of the vertebral body (VB), the needle was retraced by 1.5 cm, and a 12-mm Fogarty balloon catheter was introduced and inflated using 2-4 ml diluted contrast media (CM). After the subsequent removal of the catheter and repositioning of the needle, vertebroplasty was performed. Results: The mean volume of PMMA injected was 4.4 ml (2.5-7.2 ml). Pain reduction (measured by the Visual Analogue Scale) was achieved in 95% of the patients, dropping from on average 8.0 preinterventionally to 2.2 after a mean follow-up of 8 months. A reduction of the pain relieving medication was achieved in 68% of the cases and patient activity improved markedly. No severe or clinically relevant complications were observed. Cement leakage occurred by filling of epidural and paravertebral veins in 9.1 and 6.1% of the cases, respectively. Leakage into the paravertebral soft tissues was seen in 3.0% of the patients and to the adjacent disc space in 10.6% of the cases. (orig.)

  5. Efficacy and safety of balloon-occluded retrograde transvenous obliteration with sodium tetradecyl sulfate liquid sclerotherapy

    Energy Technology Data Exchange (ETDEWEB)

    Chang, Il Soo; Park, Sang Woo; Kwon, So Young; Cheo, Won Hyeok; Cheon, Young Koog; Shim, Chan Sup; Lee, Tae Yoon; Kim, Jeong Han [Digestive Disease Center, Konkuk University School of Medicine, Seoul (Korea, Republic of)

    2016-04-15

    To evaluate the efficacy and safety of balloon-occluded retrograde transvenous obliteration (BRTO) with sodium tetradecyl sulfate (STS) liquid sclerotherapy of gastric varices. Between February 2012 and August 2014, STS liquid sclerotherapy was performed in 17 consecutive patients (male:female = 8:9; mean age 58.6 years, range 44-86 years) with gastric varices. Retrograde venography was performed after occlusion of the gastrorenal shunt using a balloon catheter and embolization of collateral draining veins using coils or gelfoam pledgets, to evaluate the anatomy of the gastric varices. We prepared 2% liquid STS by mixing 3% STS and contrast media in a ratio of 2:1. A 2% STS solution was injected into the gastric varices until minimal filling of the afferent portal vein branch was observed (mean 19.9 mL, range 6-33 mL). Patients were followed up using computed tomography (CT) or endoscopy. Technical success was achieved in 16 of 17 patients (94.1%). The procedure failed in one patient because the shunt could not be occluded due to the large diameter of gastrorenal shunt. Complete obliteration of gastric varices was observed in 15 of 16 patients (93.8%) with follow-up CT or endoscopy. There was no rebleeding after the procedure. There was no procedure-related mortality. BRTO using STS liquid can be a safe and useful treatment option in patients with gastric varices.

  6. The atmospheric nightglow in the 300-400 nm wavelength Results by the balloon-borne experiment 'BABY'

    CERN Document Server

    Catalano, O; Biondo, B; Celi, F; Di Raffaele, R; Giarrusso, S; Linsley, J; Lo Bue, A; Mangano, A; Russo, F

    2002-01-01

    The balloon-borne experiment, named BAckground BYpass (BABY) belongs to a wider program that has as its final goal the detection and study of high-energy cosmic rays from space (satellite, Space Station). An information of fundamental importance for this class of projects concerns the nighttime background light. The instrument designed to detect fluorescence photons is basically composed of two collimated photomultipliers: a single photon-counting PMT and a charge integration PMT. We briefly report the details of the design, operation and performance of the detector, which was designed and completely built at the IFCAI-CNR Institute in Palermo. Preliminary analysis and results of the nocturnal background in the range of 300-400 nm are presented for the whole duration of the flight during the 1998 Mediterranean balloon flight campaign. A substantial part of the flight was at night over the sea.

  7. Elimination of Postoperative Pyloric Stricture by Endoscopic Electrocauterization and Balloon Dilatation in an Infant With Congenital Antral Web

    Directory of Open Access Journals (Sweden)

    Hsun-Chin Chao

    2011-04-01

    Full Text Available We, herein, report a male infant who presented with recurrent pyloric stricture after two surgeries (web excision and antropyloroplasty, which were done, respectively, at 5 days of age for congenital antral web and 6 months of age for the subsequent pyloric stricture. The patient suffered from anorexia, progressed vomiting, and weight loss gradually after the first and second surgeries, and then, endoscopy revealed severe pyloric deformity and stricture. Poor inflation was noted during endoscopic balloon dilatation because of tight pylorus; a subsequent electrocauterization and balloon dilatation were done, and the patient’s clinical symptoms improved significantly 2 weeks later. A follow-up endoscopy was performed 1 month and 12 months after endoscopic therapy, showing steady regression of pyloric stricture. The patient had adequate diet intake and growth in the later 12 months.

  8. Bronchoscopy and Fogarty Balloon Insertion of Distal Tracheo-Oesophageal Fistula for Oesophageal Atresia Repair With Video Illustration.

    Science.gov (United States)

    Rinkel, Rico; Van Poll, Daan; Sibarani-Ponsen, Renate; Sleeboom, Christien; Bakx, Roel

    2017-01-01

    During repair of esophageal atresia with distal tracheo-esophageal fistula, air leakage through the fistula during mechanical ventilation can cause respiratory demise. From February 2012 until November 2014, all patients with esophageal atresia and distal tracheo-esophageal fistula were subjected to preoperative tracheobronchoscopy. Relatively distal fistulas were cannulated with a Fogarty catheter and blocked by insufflation (video illustration). Relatively proximal distal fistulas were sealed by precise placement of a cuffed ventilation tube. Nine of 12 patients received Fogarty balloon placement. The fistula of the remaining 3 patients were sealed by careful tube placement. No complications related to tracheobronchoscopy or Fogarty placement were noted. All procedures were uneventful. Preoperative tracheobronchoscopy to evaluate the usefulness of Fogarty balloon insertion or correct tube placement for distal tracheo-esophageal fistula is a safe and easy to perform procedure that can avoid complications in type C esophageal atresia repair. © The Author(s) 2016.

  9. Feasibility of Endovascular Radiation Therapy Using Holmium-166 Filled Balloon Catheter in a Swine Hemodialysis Fistula Model: Preliminary Results

    Energy Technology Data Exchange (ETDEWEB)

    Won, Jong Yun; Lee, Kwang Hun; Lee, Do Yun [Dept. of Radiology, Research Institute of Radiological Science, Yensei University College of Medicine, Seoul (Korea, Republic of); Kim, Myoung Soo [Dept. of Radiology, Yensei University College of Medicine, Seoul (Korea, Republic of); Kang, Byung Chul [Dept. of Radiology, Internal Medicine, EwhaWoman' s University School of Medicine, Seoul (Korea, Republic of); Kim, Seung Jung [Dept. of Internal Medicine, EwhaWoman' s University School of Medicine, Seoul (Korea, Republic of)

    2011-08-15

    To describe how to make a swine hemodialysis fistula model and report our initial experience to test the feasibility of endovascular radiation therapy with Holmium-166 filled balloon catheters. The surgical formation of arterio-venous fistula (AVF) was performed by end-to-side anastomosis of the bilateral jugular vein and carotid artery of 6 pigs. After 4 weeks, angiograms were taken and endovascular radiation was delivered to the venous side of AVF with Holmium-166 filled balloon catheters. Pigs were sacrificed 4 weeks after the radiation and AVFs were harvested for histological examination. All animals survived without any morbidity during the experimental periods. The formation of fistula on the sides of necks was successful in 11 of the 12 pigs (92%). One AVF failed from the small jugular vein. On angiograms, 4 of the 11 AVFs showed total occlusion or significant stenosis and therefore, endovascular radiation could not be performed. Of 7 eligible AVFs, five underwent successful endovascular radiation and two AVFs did not undergo radiation for the control. Upon histologic analysis, one non-radiated AVF showed total occlusion and others showed intimal thickening from the neointimal hyperplasia. Formation of the swine carotid artery-jugular vein hemodialysis fistula model was successful. Endovascular radiation using a Holmium-166 filled balloon catheter was safe and feasible.

  10. Outcome of Pregnancies After Balloon Occlusion of the Infrarenal Abdominal Aorta During Caesarean in 230 Patients With Placenta Praevia Accreta

    Energy Technology Data Exchange (ETDEWEB)

    Wu, Qinghua, E-mail: qh-wu77@163.com [The First Affiliated Hospital of Zhengzhou University, Departments of Prenatal Diagnosis, and Obstetrics, Obstetric Critical Treatment Center of Henan Province (China); Liu, Zhuan, E-mail: liuchuan2015ck@163.com; Zhao, Xianlan, E-mail: zxl121292014@163.com; Liu, Cai, E-mail: liucai2015ck@163.com [The First Affiliated Hospital of Zhengzhou University, Obstetric Critical Treatment Center of Henan Province, Department of Obstetrics (China); Wang, Yanli, E-mail: wangyanli2015yfy@163.com; Chu, Qinjun, E-mail: chuqinjun2015@163.com [The First Affiliated Hospital of Zhengzhou University, Department of Anesthesiology (China); Wang, Xiaojuan, E-mail: wangxiaojun2015ck@163.com; Chen, Zhimin, E-mail: chenzhimin2015ck@163.com [The First Affiliated Hospital of Zhengzhou University, Obstetric Critical Treatment Center of Henan Province, Department of Obstetrics (China)

    2016-11-15

    PurposeTo explore the efficacy and safety of prophylactic temporary balloon occlusion of the infrarenal abdominal aorta during caesarean for the management of patients with placenta praevia accreta.MethodsTwo hundred and sixty-eight cases of placenta praevia accreta from January 2012 to June 2015 were retrospectively reviewed. Group A included two hundred and thirty patients who underwent prophylactic temporary balloon occlusion of infrarenal abdominal aorta followed by caesarean section. Group B included thirty-eight patients who underwent caesarean without endovascular intervention. The parameters including operating room time, estimated blood loss, blood transfusion volume, PT (prothrombin time) during operation, days in the intensive care unit, and total hospital days were compared between the two groups.ResultsThe operating room time, estimated blood loss, PT, the incidence of hysterectomy, blood transfusion volume, postpartum haemorrhage, and days in intensive care unit were lower in group A than in group B, with statistical significance (P < 0.05). There was no significant difference in the Apgar scores of the neonates and the incidences of thrombosis in lower limbs between the two groups (P > 0.05). No patient in the group with prophylactic temporary balloon occlusion of the infrarenal abdominal aorta was performed hysterectomy, while three patients in group B were performed hysterectomy because of uncontrollable haemorrhage.ConclusionsThe results indicate that prophylactic temporary balloon occlusion of infrarenal abdominal aorta followed by caesarean section is safe and effective to control intraoperative blood loss and greatly decreases the risk of hysterectomy in patients with placenta praevia accreta.

  11. Outcome of Pregnancies After Balloon Occlusion of the Infrarenal Abdominal Aorta During Caesarean in 230 Patients With Placenta Praevia Accreta

    International Nuclear Information System (INIS)

    Wu, Qinghua; Liu, Zhuan; Zhao, Xianlan; Liu, Cai; Wang, Yanli; Chu, Qinjun; Wang, Xiaojuan; Chen, Zhimin

    2016-01-01

    PurposeTo explore the efficacy and safety of prophylactic temporary balloon occlusion of the infrarenal abdominal aorta during caesarean for the management of patients with placenta praevia accreta.MethodsTwo hundred and sixty-eight cases of placenta praevia accreta from January 2012 to June 2015 were retrospectively reviewed. Group A included two hundred and thirty patients who underwent prophylactic temporary balloon occlusion of infrarenal abdominal aorta followed by caesarean section. Group B included thirty-eight patients who underwent caesarean without endovascular intervention. The parameters including operating room time, estimated blood loss, blood transfusion volume, PT (prothrombin time) during operation, days in the intensive care unit, and total hospital days were compared between the two groups.ResultsThe operating room time, estimated blood loss, PT, the incidence of hysterectomy, blood transfusion volume, postpartum haemorrhage, and days in intensive care unit were lower in group A than in group B, with statistical significance (P < 0.05). There was no significant difference in the Apgar scores of the neonates and the incidences of thrombosis in lower limbs between the two groups (P > 0.05). No patient in the group with prophylactic temporary balloon occlusion of the infrarenal abdominal aorta was performed hysterectomy, while three patients in group B were performed hysterectomy because of uncontrollable haemorrhage.ConclusionsThe results indicate that prophylactic temporary balloon occlusion of infrarenal abdominal aorta followed by caesarean section is safe and effective to control intraoperative blood loss and greatly decreases the risk of hysterectomy in patients with placenta praevia accreta.

  12. Feasibility and efficacy of balloon-based neuroprotection during carotid artery stenting in a single-center setting.

    Science.gov (United States)

    Schlüter, Michael; Tübler, Thilo; Mathey, Detlef G; Schofer, Joachim

    2002-09-04

    We sought to prospectively assess the feasibility and in-hospital efficacy of the PercuSurge GuardWire temporary balloon-occlusive system for neuroprotection during carotid angioplasty and stenting (CAS).Carotid angioplasty and stenting harbors a risk of distal embolization. Cerebral protection devices are currently under clinical investigation.Ninety-six consecutive patients with carotid bifurcation disease underwent a total of 102 CAS procedures with the intention to use the GuardWire for neuroprotection. GuardWire deployment was achieved in 99 procedures performed in 93 patients (97%). Device failure (n = 3) and severe neurologic responses to balloon occlusion of the targeted carotid artery (n = 2) accounted for five additional procedures that were essentially concluded without neuroprotection, for a total of 94 procedures completed as intended in 88 patients (92% procedural feasibility rate). Carotid angioplasty and stenting was performed successfully in 94 patients (100 procedures). There were no in-hospital deaths; but three patients (3.1%) sustained strokes, and two patients experienced transient ischemic attacks, for a total periprocedural complication rate of 5.2%. One major stroke occurred with the GuardWire in place, whereas two minor strokes were observed in patients in whom the device could not be deployed. Thus, successful neuroprotected CAS without major neurologic events was achieved in 87 patients (91%). The GuardWire temporary balloon-occlusive system is feasible as an adjunct to CAS in the majority of patients. It is associated with a 3.1% rate of major periprocedural neurologic complications. Adverse neurologic reactions to balloon occlusion may prohibit effective use of the system in about 2% of patients.

  13. An analysis of the deployment of a pumpkin balloon at Mars

    Science.gov (United States)

    Rand, J. L.; Phillips, M. L.

    2004-01-01

    The design of large superpressure balloons has received significant attention in recent years due to the successful demonstration of various enabling technologies and materials. Of particular note is the "pumpkin" shaped balloon concept, which allows the stress in the envelope to be limited by the surface geometry. Unlike a sphere, where the radius used to determine the stress is determined by the volume of the balloon, the pumpkin utilizes a system of meridional tendons to react the loading in one direction, and form a number of lobes, which limit the stress in the circumferential direction. A suitable superpressure balloon has been designed using this technology which will carry 2 kg in the atmosphere of Mars. The deployment of this balloon is assumed to occur while falling on a decelerator suitably designed for the Mars atmosphere. The inflation is accomplished by a 10 kg system suspended at the nadir of the balloon. As the system falls toward the surface of the planet, helium gas is transferred into the balloon, forming a partially inflated system very similar to an ascending zero pressure balloon. This analysis incorporates the flow of the planetary gas around the inflating balloon which alters the pressure distribution and shape. As a result, stresses are seen to increase beyond the design values which will require the balloon to be redesigned to accommodate this type of dynamic deployment.

  14. Experimental characterization and numerical modelling of polymeric film damage, constituting the stratospheric super pressurized balloons

    Science.gov (United States)

    Chaabane, Makram; Chaabane, Makram; Dalverny, Olivier; Deramecourt, Arnaud; Mistou, Sébastien

    The super-pressure balloons developed by CNES are a great challenge in scientific ballooning. Whatever the balloon type considered (spherical, pumpkin...), it is necessary to have good knowledge of the mechanical behavior of the envelope regarding to the flight level and the lifespan of the balloon. It appears during the working stages of the super pressure balloons that these last can exploded prematurely in the course of the first hours of flight. For this reason CNES and LGP are carrying out research programs about experimentations and modelling in order to predict a good stability of the balloons flight and guarantee a life time in adequacy with the technical requirement. This study deals with multilayered polymeric film damage which induce balloons failure. These experimental and numerical study aims, are a better understanding and predicting of the damage mechanisms bringing the premature explosion of balloons. The following damages phenomena have different origins. The firsts are simple and triple wrinkles owed during the process and the stocking stages of the balloons. The second damage phenomenon is associated to the creep of the polymeric film during the flight of the balloon. The first experimental results we present in this paper, concern the mechanical characterization of three different damage phenomena. The severe damage induced by the wrinkles of the film involves a significant loss of mechanical properties. In a second part the theoretical study, concerns the choice and the development of a non linear viscoelastic coupled damage behavior model in a finite element code.

  15. A study of wash-out process of contrast media in balloon occlusion hepatic angiography

    International Nuclear Information System (INIS)

    Sugai, Yukio; Hosoya, Takaaki; Suzuki, Mariko; Yamaguchi, Koichi

    1987-01-01

    Balloon occlusion hepatic angiography (BOHA) is coming into wide use recently because of its usefulness for high detectability of the liver tumor. In spite of complete occlusion of the hepatic artery by the balloon, contrast media injected from the catheter tip into the hepatic artery is gradually washed out. This wash-out process may reflect the collateral circulation corresponded to the acute occlusion of the hepatic artery. The process varies according to the position of its occlusion and the arterial variations of branchings. We analyzed the wash-out process in 92 cases of BOHA performed in our department from a viewpoint of collateral circulation. In BOHA at the proper hepatic artery without extra-hepatic branches contrast media were washed out mainly by the flow from the epicholedocal plexus, and contrast media often persisted till late in the umbilical portion of the hepatic artery which is considered as a water-shed of the intrahepatic collateral flow. Furthermore, we refered to the clinical significance of the collateral circulation observed in BOHA with special emphasis upon some problems in the chemoembolization of the liver tumor and visualization of the gallbladder wall. (author)

  16. ARM Tethered Balloon System & AALCO Activities at AMF3 Site at Oliktok Point, AK

    Science.gov (United States)

    Hardesty, J.; Dexheimer, D.; Mei, F.; Roesler, E. L.; Longbottom, C.; Hillman, B. R.

    2017-12-01

    Sandia National Laboratories (SNL) has operated the Atmospheric Radiation Measurement program's (ARM) third ARM Mobile Facility (AMF3) and the restricted airspace associated with it at Oliktok Point, Alaska, since October 2013. The site hosts ground-based instrumentation which collects a variety of continuous atmospheric measurements as well as user-conducted unmanned aircraft and tethered balloon campaigns. SNL has operated ARM's tethered balloon system (TBS) as part of the Inaugural Campaigns for ARM Research using Unmanned Systems (ICARUS) since 2016. AALCO (Aerial Assessment of Liquid in Clouds at Oliktok), is an ARM Intensive Operations Period conducted by SNL at the AMF3 since 2016. The operation of the TBS during ICARUS and AALCO to altitudes above 4,000' AGL in a variety of seasons and conditions is addressed. A Distributed Temperature Sensing (DTS) system and supercooled liquid water content (SLWC) sensors have been deployed under both campaigns. The performance of these sensors is discussed and results are presented. DTS measurements and their relationship to concurrent temperature measurements from unmanned aircraft and radiosondes are shown. SLWC sensor in situ measurements are compared with microwave radiometer and radiosonde-derived measurements. Preliminary analysis of using Large Eddy Simulations to compare with the SLWC measurements reveals three-dimensional properties of the observed clouds.

  17. A system for visualization and automatic placement of the endoclamp balloon catheter

    Science.gov (United States)

    Furtado, Hugo; Stüdeli, Thomas; Sette, Mauro; Samset, Eigil; Gersak, Borut

    2010-02-01

    The European research network "Augmented Reality in Surgery" (ARIS*ER) developed a system that supports minimally invasive cardiac surgery based on augmented reality (AR) technology. The system supports the surgical team during aortic endoclamping where a balloon catheter has to be positioned and kept in place within the aorta. The presented system addresses the two biggest difficulties of the task: lack of visualization and difficulty in maneuvering the catheter. The system was developed using a user centered design methodology with medical doctors, engineers and human factor specialists equally involved in all the development steps. The system was implemented using the AR framework "Studierstube" developed at TU Graz and can be used to visualize in real-time the position of the balloon catheter inside the aorta. The spatial position of the catheter is measured by a magnetic tracking system and superimposed on a 3D model of the patient's thorax. The alignment is made with a rigid registration algorithm. Together with a user defined target, the spatial position data drives an actuator which adjusts the position of the catheter in the initial placement and corrects migrations during the surgery. Two user studies with a silicon phantom show promising results regarding usefulness of the system: the users perform the placement tasks faster and more accurately than with the current restricted visual support. Animal studies also provided a first indication that the system brings additional value in the real clinical setting. This work represents a major step towards safer and simpler minimally invasive cardiac surgery.

  18. Stenting vs. balloon angioplasty with provisional stenting for the treatment of vessels with small reference diameter.

    Science.gov (United States)

    Lemos, Pedro A; Martinez, Eulogio E; Quintella, Edgard; Harrell, Lari C; Ramires, Jose A F; Ribeiro, Expedito E; da Gama, Marcus N; Horta, Pedro E; Kajita, Luiz J; Esteves, Antonio; Perin, Marco A; Soares, Paulo R; Zalc, Silvio; Palacios, Igor F

    2002-03-01

    A consecutive series of interventions in vessels with reference diameter < or = 2.75 mm was retrospectively analyzed according to preprocedure strategy: balloon angioplasty with provisional stenting (PTCA group, 73 patients) and primary stenting (PS group, 122 patients). In the PS group, there were more patients with single-vessel disease (54.1% vs. 37.0%; P = 0.021), less patients with three-vessel disease (9.0% vs. 24.7%; P = 0.003), more LAD interventions (54.9% vs. 31.5; P = 0.002), and less left circumflex interventions (22.1% vs. 45.2%; P < 0.001). Reference diameter was larger in the PS group (2.28 +/- 0.35 mm vs. 2.11 +/- 0.36 mm; P = 0.001). Provisional stenting was performed in 39.7% of PTCA group. At long-term outcome, the incidence of composite major events was similar between the PTCA and the PS groups (20.5% vs. 17.2%, respectively; P = NS). Treatment of small vessels with balloon dilatation and provisional stenting or with primary stenting yielded similar late outcomes. Operators' choice of treatment strategy was based on particular angiographic characteristics. Copyright 2002 Wiley-Liss, Inc.

  19. A survey on the use of intra-aortic balloon pump in cardiac surgery

    Directory of Open Access Journals (Sweden)

    Elena Bignami

    2012-01-01

    Full Text Available Intra-aortic balloon pump (IABP is an established tool in the management of cardiac dysfunction in cardiac surgery. The best timing for IABP weaning is unknown and varies greatly among cardiac centers. The authors investigated the differences in IABP management among 66 cardiac surgery centers performing 40,675 cardiac surgery procedures in the 12-month study period. The centers were contacted through email, telephone, or in person interview. IABP management was very heterogeneous in this survey: In 43% centers it was routinely removed on the first postoperative day, and in 34% on the second postoperative day. In 50% centers, it was routinely removed after extubation of the patients whereas in 15% centers it was removed while the patients were sedated and mechanically ventilated. In 66% centers, patients were routinely receiving pharmacological inotropic support at the time of removal of IABP. The practice of decreasing IABP support was also heterogeneous: 57% centers weaned by reducing the ratio of beat assistance whereas 34% centers weaned by reducing balloon volume. We conclude that the management of IABP is heterogeneous and there is a need for large prospective studies on the management of IABP in cardiac surgery.

  20. Percutaneous balloon dilatation of stenotic calyceal diverticular infundibula in patients with recurrent urinary tract infections

    International Nuclear Information System (INIS)

    Keeling, Aoife N.; Wang, Tim T.; Lee, Michael J.

    2011-01-01

    Aim: Renal calyceal diverticula are usually detected as incidental findings on intravenous pyelograms (IVPs) and rarely manifest any clinical signs or symptoms. However, they can interfere with patient's quality of life in a number of instances causing pain, recurrent urinary tract infections (UTIs), abscess, systemic sepsis and calculus formation. The purpose of this study was to review the clinical indications, procedure technique and clinical outcome in all patients referred to Interventional Radiology for the percutaneous management of renal calyceal diverticula. Materials and methods: A retrospective review of all patients treated with percutaneous balloon dilatation of calyceal diverticular infundibula in the Interventional Radiology Department over a 10-year period was performed. Data collected included clinical details, laboratory indices, IVP and CT findings, procedure details and clinical outcome. Results: A total of three patients were treated over the course of the study period. All patients were young females who presented as a result of recurrent urinary tract infections. The calyceal diverticula were diagnosed incidentally on routine IVPs, with CT eloquently confirming the plain film findings in two cases. Technical procedure success was achieved in all cases, avoiding surgical intervention. Clinical follow-up revealed no further UTIs following dilatation. Conclusion: Fluoroscopic guided percutaneous balloon dilatation of renal calyceal diverticular infundibula following direct diverticular puncture is a safe and well tolerated method to reduce UTI and potentially avoid future stone formation.

  1. Wireless capsule endoscopy and double-balloon enteroscopy for the diagnosis of obscure gastrointestinal bleeding.

    Science.gov (United States)

    Gerson, Lauren B; Van Dam, Jacques

    2004-09-01

    Standard endoscopic examination (upper gastrointestinal endoscopy and colonoscopy) fails to detect the cause of gastrointestinal hemorrhage in approximately 5% of patients. Before the availability of wireless capsule endoscopy and double-balloon enteroscopy, imaging modalities for the small intestine distal to the ligament of Treitz included barium contrast examination and/or enteroclysis, push, passive, or intraoperative enteroscopy, technetium 99m labeled sulfur colloid scanning, angiography, and computed tomography, although the diagnostic yield of all of these imaging modalities was low. In 2001, wireless capsule endoscopy became available for the evaluation of patients with probable small intestinal hemorrhage. Advantages of wireless capsule endoscopy include that the procedure is noninvasive, requires no sedation, and does not expose the patient to ionizing radiation. In patients with obscure gastrointestinal hemorrhage, studies have demonstrated an additional 25 to 50% diagnostic yield using wireless capsule endoscopy when compared to other diagnostic modalities. The major limitations of capsule endoscopy were its inability to obtain a biopsy, precisely localize a lesion, or perform therapeutic endoscopy. In 2001, the double-balloon enteroscope was introduced. This new endoscopic technique provides the gastroenterologist with an opportunity for further evaluation and treatment of abnormalities detected on wireless capsule endoscopy or other small intestinal imaging studies.

  2. Brain 'Embolism' Detected by Magnetic Resonance Imaging During Percutaneous Mitral Balloon Commissurotomy

    International Nuclear Information System (INIS)

    Rocha, Paulo; Qanadli, Salah D.; Strumza, Pierre; Kacher, Safia; Aberkane, Linda; Aubry, Pierre; Rigaud, Michel; Lacombe, Pascal; Raffestin, Bernadette

    1999-01-01

    Purpose: The common finding of thrombi between the bifoil balloons when they were extracted after mitral dilation prompted us to look for evidence of minor brain embolisms using the sensitive technique of BMRI (brain magnetic resonance T2-weighted imaging). Methods: BMRI was performed within 48 hr before and after a percutaneous mitral balloon commissurotomy (PMBC) in each of the 63 patients in this study. Results: There was evidence (hyperintensity foci: HI) of a previous asymptomatic brain embolism in 38 of 63 patients before PMBC and a new HI appeared in 18 of 63 patients after the procedure. New HI signals were found exclusively in the white matter in 8 of 18 patients and in only 3 of 18 were HI signs larger than 1 cm. One patient, with an HI signal >1 cm in the thalamus and another 8; 4, patients from western countries vs the others) were not statistically significant, probably because the number of patients in each subgroup was low. Patients in atrial fibrillation had slightly more (not significant) HI before PMBC (15/20, 75%) than patients in sinus rhythm (23/43, 53%), but after PMBC their HI frequencies were similar (atrial fibrillation: 5/20, 25%; sinus rhythm: 13/43, 30%). Conclusion: Brain microembolism is frequent during PMBC, but is often anatomically limited and free from clinical signs in most cases. Brain embolism seems to be related mainly to the procedure itself and not the features of the patient

  3. Percutaneous balloon dilatation of stenotic calyceal diverticular infundibula in patients with recurrent urinary tract infections

    Energy Technology Data Exchange (ETDEWEB)

    Keeling, Aoife N. [Department of Academic Radiology, Beaumont Hospital, Beaumont Road, Dublin 9 (Ireland); Wang, Tim T. [Department of Biosurgery and Surgical Technology, Surgical Epidemiology and Quality Unit, Imperial College London, St. Mary' s Hospital, London W2 1NY (United Kingdom); Lee, Michael J., E-mail: mlee@rcsi.ie [Department of Academic Radiology, Beaumont Hospital, Beaumont Road, Dublin 9 (Ireland)

    2011-02-15

    Aim: Renal calyceal diverticula are usually detected as incidental findings on intravenous pyelograms (IVPs) and rarely manifest any clinical signs or symptoms. However, they can interfere with patient's quality of life in a number of instances causing pain, recurrent urinary tract infections (UTIs), abscess, systemic sepsis and calculus formation. The purpose of this study was to review the clinical indications, procedure technique and clinical outcome in all patients referred to Interventional Radiology for the percutaneous management of renal calyceal diverticula. Materials and methods: A retrospective review of all patients treated with percutaneous balloon dilatation of calyceal diverticular infundibula in the Interventional Radiology Department over a 10-year period was performed. Data collected included clinical details, laboratory indices, IVP and CT findings, procedure details and clinical outcome. Results: A total of three patients were treated over the course of the study period. All patients were young females who presented as a result of recurrent urinary tract infections. The calyceal diverticula were diagnosed incidentally on routine IVPs, with CT eloquently confirming the plain film findings in two cases. Technical procedure success was achieved in all cases, avoiding surgical intervention. Clinical follow-up revealed no further UTIs following dilatation. Conclusion: Fluoroscopic guided percutaneous balloon dilatation of renal calyceal diverticular infundibula following direct diverticular puncture is a safe and well tolerated method to reduce UTI and potentially avoid future stone formation.

  4. Percutaneous balloon dilatation of stenotic calyceal diverticular infundibula in patients with recurrent urinary tract infections.

    LENUS (Irish Health Repository)

    Keeling, Aoife N

    2012-02-01

    AIM: Renal calyceal diverticula are usually detected as incidental findings on intravenous pyelograms (IVPs) and rarely manifest any clinical signs or symptoms. However, they can interfere with patient\\'s quality of life in a number of instances causing pain, recurrent urinary tract infections (UTIs), abscess, systemic sepsis and calculus formation. The purpose of this study was to review the clinical indications, procedure technique and clinical outcome in all patients referred to Interventional Radiology for the percutaneous management of renal calyceal diverticula. MATERIALS AND METHODS: A retrospective review of all patients treated with percutaneous balloon dilatation of calyceal diverticular infundibula in the Interventional Radiology Department over a 10-year period was performed. Data collected included clinical details, laboratory indices, IVP and CT findings, procedure details and clinical outcome. RESULTS: A total of three patients were treated over the course of the study period. All patients were young females who presented as a result of recurrent urinary tract infections. The calyceal diverticula were diagnosed incidentally on routine IVPs, with CT eloquently confirming the plain film findings in two cases. Technical procedure success was achieved in all cases, avoiding surgical intervention. Clinical follow-up revealed no further UTIs following dilatation. CONCLUSION: Fluoroscopic guided percutaneous balloon dilatation of renal calyceal diverticular infundibula following direct diverticular puncture is a safe and well tolerated method to reduce UTI and potentially avoid future stone formation.

  5. Balloon-borne hard x-ray imaging observations of non-thermal phenomena

    Science.gov (United States)

    Kunieda, Hideyo

    2006-06-01

    Non-thermal phenomena is now-a-days recognized as an important half of the energetics of the Universe. Hard X-ray emission from energetic particles is the most important clue to investigate the non-thermal phenomena. Hard X-ray imaging telescopes are known to improve the sensitivity of hard X-ray observations dramatically. Since hard X-rays above 25 keV can be observed at the altitude of 40 km, we are performing hard X-ray imaging balloon experiments as the path finders of future satellite missions of hard X-ray imaging. Major fields we are looking into are non-thermal components from SNR and Cluster of galaxies and the power law components from AGN even with thick column. The former are related to acceleration mechanisms of high energy particles responsible for hard X-ray power law components. The latter is the complete search of emission from massive blackholes which contribute most to the cosmic X-ray background. Our current balloon programs are InFOCμS experiment and SUMIT project. NeXT is the hard X-ray imaging mission proposed as the next Japanese X-ray mission.

  6. Use of gastric balloon manometry for estimation of intra-abdominal pressure in horses.

    Science.gov (United States)

    Canola, P A; Perotta, J H; Laskoski, L M; Escobar, A; Melo e Silva, C A; Canola, J C; Johnson, P J; Valadão, C A A

    2011-11-01

    Standing laparoscopic procedures, facilitated by abdominal insufflation with carbon dioxide, are being employed to an increasingly greater extent in horses. However, a sustained increase in abdominal pressure may be life-threatening. A practical method for intra-abdominal pressure (IAP) assessment is imperative. Although indirect methods for estimating IAP have been extensively studied in man, little work has been performed in veterinary medicine. To investigate the utility of gastric manometry for purposes of evaluating IAP in horses. Gastric pressure (P(ga) ) was estimated by balloon manometry in 8 healthy, mature horses, before and during a 30 min passive pneumoperitoneum induced by right paralumbar puncture. The balloon manometer was positioned within the gastric lumen and inflated using 2 separate volumes of air: 10 and 50 ml. P(ga) Gastric pressure was determined at baseline (0) and 5, 15 and 30 min after induction of passive pneumoperitoneum. Intra-abdominal pressure was measured directly by right paralumbar puncture using an 8 gauge needle at baseline and immediately following establishment of passive pneumoperitoneum. Baseline IAP values were negative and increased (P≤0.05) during development of passive pneumoperitoneum. However, recorded P(ga) measurements for both inflation volumes were positive before (baseline) and during the course of the passive pneumoperitoneum. Measured P(ga) values did not correlate with IAP at any time. Our results suggest that the indirect method used in human patients for estimating IAP by P(ga) is not applicable for horses. © 2011 EVJ Ltd.

  7. Development and in Vitro Characterization of Photochemically Crosslinked Polyvinylpyrrolidone Coatings for Drug-Coated Balloons

    Directory of Open Access Journals (Sweden)

    Svea Petersen

    2013-12-01

    Full Text Available Polyvinylpyrrolidone (PVP is a conventionally applied hydrophilic lubricious coating on catheter-based cardiovascular devices, used in order to ease movement through the vasculature. Its use as drug reservoir and transfer agent on drug-coated balloons (DCB is therefore extremely promising with regard to the simplification of its approval as a medical device. Here, we developed a PVP-based coating for DCB, containing paclitaxel (PTX as a model drug, and studied the impact of crosslinking via UV radiation on drug stability, wash off, and transfer during simulated use in an in vitro vessel model. We showed that crosslinking was essential for coating stability and needed to be performed prior to PTX incorporation due to decreased drug bioavailability as a result of photodecomposition and/or involvement in vinylic polymerization with PVP under UV radiation. Moreover, the crosslinking time needed to be carefully controlled. While short radiation times did not provide enough coating stability, associated with high wash off rates during DCB insertion, long radiation times lowered drug transfer efficiency upon balloon expansion. A ten minutes radiation of PVP, however, combined a minimized drug wash off rate of 34% with an efficient drug transfer of 49%, underlining the high potential of photochemically crosslinked PVP as a coating matrix for DCB.

  8. The HXR80M-balloon experiment: a microprocessor-controlled transatlantic payload

    International Nuclear Information System (INIS)

    Ubertini, P.; Bazzano, A.; Boccaccini, L.

    1980-01-01

    Following the results obtained from the succesful transatlantic flight launched during the summer 1976 from the CNR Milo Base, Sicily, the Laboratorio di Astrofisica Spaziale has started a new program in the hard X-ray astronomy field. It basically consists in the development of high resolution large area Multiwire Proportional Chambers to be employed in long duration balloon flights to study and monitor galactic and extragalactic sources. This note will describe the flight configuration and performances of the HXR80M payload. The experiment is expected to fly during July 1980 from the Milo Base in the framework of the CNR experimental balloon campaign. The note will analyze the main characteristics of the detectors employed, of the data handling electronics and in particular of the hardware and the software of the on-board microprocessor controlled multichannel analyzer. In fact the limitation due to the low bit rate HF link (1.2kbit/s) and the long flight duration (about one week) make imperative the use of an on-board microprocessor system to handle and select in real time the scientific data and to control the housekeeping and the telecommand systems

  9. Balloon remodeling may improve angiographic results of stent-assisted coiling of unruptured intracranial aneurysms.

    Science.gov (United States)

    Gentric, Jean-Christophe; Biondi, Alessandra; Piotin, Michel; Mounayer, Charbel; Lobotesis, Kyriakos; Bonafé, Alain; Costalat, Vincent

    2015-04-01

    Endovascular treatment of wide-necked and complex aneurysms may require stent-assisted coiling, either as primary stenting or combined with the balloon remodeling technique (BRT). To compare the angiographic results and clinical outcomes of both strategies in the Safety and Efficacy of Neuroform for Treatment of intracranial Aneurysms (SENAT) registry. SENAT was a prospective, multicenter registry that allowed BRT in conjunction with stenting and coiling with bare platinum coils. Clinical and angiographic outcomes of 97 patients with unruptured aneurysms treated with stenting, 51 after BRT (BRT+) and 46 without balloon assistance (BRT-), were retrieved from the SENAT database. Technical, clinical, and angiographic outcomes were compared between the 2 groups. Periprocedural morbimortality and midterm clinical outcomes were not different between groups. Residual aneurysms were observed in 7.8% of BRT+ and in 21.7% of BRT- (P = .08) at the end of the stenting procedure. Four retreatments were performed during the follow-up period (2 BRT+, 2 BRT-). Twelve- to 18-month anatomic results showed a significant difference between groups, with a residual aneurysm being observed in 6.1% of BRT+ as compared to 22.7% of BRT- patients (P = .03). Primary BRT followed by stent-assisted coiling may be associated with fewer residual aneurysms at 12 to 18 months as compared to stent-assisted coiling alone.

  10. Ballooning instabilities in tokamaks with sheared toroidal flows

    International Nuclear Information System (INIS)

    Waelbroeck, F.L.; Chen, L.

    1990-11-01

    The stability of ballooning modes in the presence of sheared toroidal flows is investigated. The eigenmodes are shown to be related by a Fourier transformation to the non-exponentially growing Floquet solutions found by Cooper. It is further shown that the problem cannot be reduced further than to a two dimensional partial differential equation. Next, the generalized ballooning equation is solved analytically for a circular tokamak equilibrium with sonic flows, but with a small rotation shear compared to the sound speed. With this ordering, the centrifugal forces are comparable to the pressure gradient forces driving the instability, but coupling of the mode with the sound wave is avoided. A new stability criterion is derived which explicitly demonstrates that flow shear is stabilizing at constant centrifugal force gradient. 34 refs

  11. Dosimetry of beta emitting radionuclides for use in balloon angioplasty

    International Nuclear Information System (INIS)

    Fox, R.A.

    1997-01-01

    The dose at varying distances from the surface of an infinite cylinder containing 90 Y, 32 P and 188 Re respectively is calculated using published scaled point dose kernels for these three radionuclides. It is shown that all are suitable radionuclides for use in the irradiation of arteries subsequent to balloon angioplasty. All three may be used as a radioactive liquid in the angioplasty balloon, thereby simplifying the procedure and enabling a uniform radiation dose to be given to the arterial wall. It is however shown that there is a rapid reduction in dose with distance from the arterial wall which demands careful specification of the prescribed radiation dose. A similar rapid reduction with distance is also found with a central radioactive wire or with a radioactive stent containing the same radionuclides. (author)

  12. Balloon-borne disposable radiometer for cloud detection.

    Science.gov (United States)

    Nicoll, K A; Harrison, R G

    2012-02-01

    A low cost, disposable instrument for measuring solar radiation during meteorological balloon flights through cloud layers is described. Using a photodiode detector and low thermal drift signal conditioning circuitry, the device showed less than 1% drift for temperatures varied from +20 °C to -35 °C. The angular response to radiation, which declined less rapidly than the cosine of the angle between the incident radiation and normal incidence, is used for cloud detection exploiting the motion of the platform. Oriented upwards, the natural motion imposed by the balloon allows cloud and clear air to be distinguished by the absence of radiation variability within cloud, where the diffuse radiation present is isotropic. The optical method employed by the solar radiation instrument has also been demonstrated to provide higher resolution measurements of cloud boundaries than relative humidity measurements alone.

  13. Accelerated partial breast irradiation utilizing balloon brachytherapy techniques

    International Nuclear Information System (INIS)

    Strauss, Jonathan B.; Dickler, Adam

    2009-01-01

    To overcome the barriers to BCT, methods of PBI in the setting of breast conservation have been explored. The method of PBI with the longest published follow-up is multi-catheter interstitial brachytherapy. Balloon-based brachytherapy with the MammoSite brachytherapy applicator was designed to simplify the brachytherapy procedure for PBI, enhance the reproducibility of the dosimetry, and improve patient comfort. The rates of local recurrence following PBI with the MammoSite applicator have been low, but there are few published reports and follow-up has been relatively short. The cosmetic outcomes and toxicity of MammoSite PBI are comparable to those seen after multicatheter-based PBI. Additional methods of balloon brachytherapy, including Xoft and SenoRx Contura have been developed. Finally, long-term follow-up after PBI is important for the welfare of individual patients and in order to establish the efficacy, late toxicity and cosmetic outcomes of this technique.

  14. The impact of balloon catheter dilation on frequency of sinus surgery in the United States

    Directory of Open Access Journals (Sweden)

    Holy CE

    2014-04-01

    Full Text Available Chantal E Holy,1 John M Ellison,1 Charles Schneider,1 Howard L Levine2,3 1Health Economics and Reimbursement, 2Medical Affairs, Acclarent Inc., a Johnson & Johnson Company, Menlo Park, CA, USA; 3Cleveland Nasal-Sinus and Sleep Center, Cleveland, OH, USA Purpose: Endoscopic sinus surgery for patients with chronic rhinosinusitis (CRS unresponsive to medical therapy has traditionally been performed under general anesthesia and in the operating room. Balloons for catheter dilation of paranasal sinuses were introduced in 2005, allowing sinus surgery to be safely performed either in the operating room or the office care setting, under local anesthesia. This change in care setting has raised concerns of overuse or expanded indications for sinus surgery. This study was thus designed to evaluate changes in surgical volumes in the United States, for the period 2006–2011, and to evaluate the impact of the sinus balloons on surgical practice. Methods: The MarketScan® Commercial Claims and Encounter Database was queried for the period 2006 to 2011 using CRS International Classification of Diseases, Ninth Revision codes (473.X and sinus surgery US-based Common Procedural Terminology (CPT codes (endoscopic sinus surgery: CPT codes 31254–31294 and 31299; balloon catheter dilation: CPT codes 31295–31297. MarketScan's projection methodology was applied to estimate the nationwide prevalence of CRS and the incidence of sinus surgery. Procedural case mix and total average payment per surgery were analyzed. Results: From 2006 to 2011, the yearly prevalence of CRS and sinus surgery volume remained flat with ~430 patients with CRS per 100,000 in the employer-sponsored insured population, of which ~117/100,000 underwent surgery. In 2006, 2.69 paranasal sinuses (95% confidence interval [95% CI]: 2.65–2.71 were treated during each individual sinus surgery, with an additional 1.11 nasal procedures (95% CI: 1.08–1.13 performed concurrently. By 2011, the

  15. The Inflammatory Sequelae of Aortic Balloon Occlusion in Hemorrhagic Shock

    Science.gov (United States)

    2014-04-13

    metabolic profile was significantly different. Clamp occlusion was associated with a significantly higher lactate burden and vasopressor requirement in...balloon occlusion. This was associated with a significant metabolic burden as measured by serum lactate; however, with suitable resuscitation, this...interleukin 10, reduces nuclear factor kB DNA binding, and improves short term survival in lethal endotoxemia . Crit Care Med 2004;32:801. [36] Manning JE

  16. Asymptotic stability boundaries of ballooning modes in circular tokamaks

    International Nuclear Information System (INIS)

    Chen, L.; Bondeson, A.; Chance, M.S.

    1987-06-01

    The model ballooning mode equation of Connor, Hastie, and Taylor for large-aspect-ratio circular tokamaks is analyzed in the limit of large pressure gradient, and corresponding expressions for stability boundaries are derived. In particular, it is found that for a fixed radial wave number, there exists an infinite sequence of unstable bands, and that minimizing over the radial wave numbers leads to asymptotic merging between the neighboring bands

  17. Percutaneous balloon valvuloplasty of a stenosed mitral bioprosthesis.

    Science.gov (United States)

    Fernandez, J J; DeSando, C J; Leff, R A; Ord, M; Sabbagh, A H

    1990-01-01

    A 62-year-old woman with disabling mitral prosthetic stenosis underwent percutaneous balloon valvuloplasty. The transvalvular gradient preoperatively was 22 mm Hg and was reduced to 6 mm Hg after the valvuloplasty. the valve area was increased from an initial value of 0.77 cm2 to 1.53 cm2. No complications occurred related to the Further studies are necessary to ascertain the indications and long-term results of percutaneous valvuloplasty on bioprosthesis in the mitral position.

  18. Prime time for drug eluting balloons in SFA interventions?

    Science.gov (United States)

    Brodmann, M

    2014-08-01

    Peripheral arterial disease most commonly affects the femoropopliteal segment. Despite enormous improvements in device and treatment technology the long-term patency rate and clinical benefit of endovascular treatment in the respective vascular bed is not satisfying. Drug coated balloon technology as a treatment option in femoropopliteal disease has shown encouraging results in first-in-man trials, which have now been proven in large randomized controlled trials.

  19. Brachytherapy model with sodium pertechnetate-99mTc balloon (Na99mTcO4-) for breast cancer: evaluation of dosimetry and cell response

    International Nuclear Information System (INIS)

    Lima, Carla Flavia de

    2016-01-01

    Breast cancer is the most common type of cancer that affects more women worldwide. Among various treatment options, radiotherapy which is often used as a treatment for locoregional recurrences control or to decrease tumor size. In patients with breast cancer at an early stage, a booster dose (boost) in the primary tumor area can be applied after conventional radiation therapy. There are several drawbacks to applying this technique. In this work we aimed to perform a dosimetric analysis in a breast model, where it put a balloon filled with sodium pertechnetate- 99m Tc (Na 99m TcO 4 - ) which in future could be used in preference to other possible therapies. The methodology involved the development of dosimetry in water based on radiochromic films and in a computational voxel thorax model. Calibration protocol achieved a mathematical relation between absorbed dose versus optical density (OD) measured at a set of radiochromic sample films placed at the surface of the balloon plus 1 cm up to 10 cm far, in which theoretical dose values were provided by MCNP modeling, reproducing the water equivalent physical simulator. A voxel model of a female thorax, developed at the SISCODES/MCNP codes, received a filled balloon inside. Spatial dose distribution was generated, illustrating the dose received in the chest wall, glandular tissue, breast skin and lung. The dosimetric findings contribute to present the Na 99m TcO 4 - balloon modality which provides a suitable spatial dose distribution in the tumor bed preserving adjacent health tissues. We also studied the radiobiological response radio resistant mammary adenocarcinoma cells (MDAMB231) by exposure of these cells to Na 99m TcO 4 - balloon. The findings include the presence of apoptotic cells in the balloon around point out a favorable response. In conclusion, the balloon may represent a viable option in the supplementary therapy of breast cancer in patients who have appropriate indication. Irradiation with Na 99m TcO 4

  20. A Sensitivity Analysis of fMRI Balloon Model

    KAUST Repository

    Zayane, Chadia

    2015-04-22

    Functional magnetic resonance imaging (fMRI) allows the mapping of the brain activation through measurements of the Blood Oxygenation Level Dependent (BOLD) contrast. The characterization of the pathway from the input stimulus to the output BOLD signal requires the selection of an adequate hemodynamic model and the satisfaction of some specific conditions while conducting the experiment and calibrating the model. This paper, focuses on the identifiability of the Balloon hemodynamic model. By identifiability, we mean the ability to estimate accurately the model parameters given the input and the output measurement. Previous studies of the Balloon model have somehow added knowledge either by choosing prior distributions for the parameters, freezing some of them, or looking for the solution as a projection on a natural basis of some vector space. In these studies, the identification was generally assessed using event-related paradigms. This paper justifies the reasons behind the need of adding knowledge, choosing certain paradigms, and completing the few existing identifiability studies through a global sensitivity analysis of the Balloon model in the case of blocked design experiment.

  1. Balloon Cell Urethral Melanoma: Differential Diagnosis and Management

    Directory of Open Access Journals (Sweden)

    M. McComiskey

    2015-01-01

    Full Text Available Introduction. Primary malignant melanoma of the urethra is a rare tumour (0.2% of all melanomas that most commonly affects the meatus and distal urethra and is three times more common in women than men. Case. A 76-year-old lady presented with vaginal pain and discharge. On examination, a 4 cm mass was noted in the vagina and biopsy confirmed melanoma of a balloon type. Preoperative CT showed no distant metastases and an MRI scan of the pelvis demonstrated no associated lymphadenopathy. She underwent anterior exenterative surgery and vaginectomy also. Histology confirmed a urethral nodular malignant melanoma. Discussion. First-line treatment of melanoma is often surgical. Adjuvant treatment including chemotherapy, radiotherapy, or immunotherapy has also been reported. Even with aggressive management, malignant melanoma of the urogenital tract generally has a poor prognosis. Recurrence rates are high and the mean period between diagnosis and recurrence is 12.5 months. A 5-year survival rate of less than 20% has been reported in balloon cell melanomas along with nearly 20% developing local recurrence. Conclusion. To the best of our knowledge, this case is the first report of balloon cell melanoma arising in the urethra. The presentation and surgical management has been described and a literature review provided.

  2. The Rocket Balloon (Rocketball): Applications to Science, Technology, and Education

    Science.gov (United States)

    Esper, Jaime

    2009-01-01

    Originally envisioned to study upper atmospheric phenomena, the Rocket Balloon system (or Rocketball for short) has utility in a range of applications, including sprite detection and in-situ measurements, near-space measurements and calibration correlation with orbital assets, hurricane observation and characterization, technology testing and validation, ground observation, and education. A salient feature includes the need to reach space and near-space within a critical time-frame and in adverse local meteorological conditions. It can also provide for the execution of technology validation and operational demonstrations at a fraction of the cost of a space flight. In particular, planetary entry probe proof-of-concepts can be examined. A typical Rocketball operational scenario consists of a sounding rocket launch and subsequent deployment of a balloon above a desired location. An obvious advantage of this combination is the additional mission 'hang-time' rendered by the balloon once the sounding rocket flight is completed. The system leverages current and emergent technologies at the NASA Goddard Space Flight Center and other organizations.

  3. Endoscopic ultrasound with double-balloon endoscopy for the diagnosis of inverted Meckel’s diverticulum: a case report

    Directory of Open Access Journals (Sweden)

    Araki Akihiro

    2012-09-01

    Full Text Available Abstract Introduction Inverted Meckel’s diverticulum has usually been misdiagnosed in the cases based on computed tomography images presented in the literature. The final diagnosis was made intra-operatively or by pathology reports after surgery. Despite this, preoperative diagnosis could be made successfully by using endoscopic ultrasound with double-balloon endoscopy prior to surgery. Case presentation A 60-year-old Japanese woman with severe anemia complained of several episodes of black stool over the preceding 2 years. Abdominal computed tomography showed a 3.0-cm low-density tumor in the ileum, suggesting a diagnosis of intestinal lipoma. Examination of the tumor by endoscopic ultrasound with double-balloon endoscopy revealed a hypo-echoic layer corresponding to the muscularis propria, and a hyper-echoic layer corresponding to the fat tissue. These findings, which suggested that the tumor included areas outside the intestinal serosa, are not typical for a lipoma, despite the existence of a hyper-echoic layer corresponding to fatty tissue. We then considered a diagnosis of inverted Meckel’s diverticulum. Conclusion Lipoma and inverted Meckel’s diverticulum are difficult to differentially diagnose by computed tomography. Polypectomy is the preferred therapeutic approach when a lipoma is present; however, polypectomy in a patient with Meckel’s diverticulum requires full-thickness resection. Situations where polypectomy is performed without preparing for full-thickness resection can be avoided by first making a precise diagnosis using double-balloon endoscopy and endoscopic ultrasound.

  4. Six-Month Results From the Initial Randomized Study of the Ranger Paclitaxel-Coated Balloon in the Femoropopliteal Segment.

    Science.gov (United States)

    Bausback, Yvonne; Willfort-Ehringer, Andrea; Sievert, Horst; Geist, Volker; Lichtenberg, Michael; Del Giudice, Costantino; Sauguet, Antoine; Diaz-Cartelle, Juan; Marx, Claudia; Ströbel, Armin; Schult, Ingolf; Scheinert, Dierk

    2017-08-01

    To evaluate the performance of the Ranger paclitaxel-coated balloon vs uncoated balloon angioplasty for femoropopliteal lesions. Between January 2014 and October 2015, the prospective, randomized RANGER SFA study ( ClinicalTrials.gov identifier NCT02013193) enrolled 105 patients with symptomatic lower limb ischemia (Rutherford category 2-4) and stenotic lesions in the nonstented femoropopliteal segment at 10 European centers. Seventy-one patients (mean age 68±8 years; 53 men) were enrolled in the Ranger drug-coated balloon (DCB) arm and 34 patients (mean age 67±9 years; 23 men) were assigned to the control group. Six-month analysis included angiographic late lumen loss and safety and clinical outcomes assessments. Baseline characteristics of the DCB and control groups were similar, as were lesion lengths (68±46 vs 60±48 mm; p=0.731), severity of calcification (p=0.236), and the prevalence of occlusions (34% vs 34%; p>0.999). At 6 months, late lumen loss was significantly less for the DCB group vs controls (-0.16±0.99 vs 0.76±1.4; p=0.002). The DCB group had significantly greater freedom from binary restenosis (92% vs 64%; p=0.005) and primary patency rates (87% vs 60%; p=0.014). Target lesion revascularization rates were 5.6% in the DCB group and 12% in the control group (p=0.475). No target limb amputations or device-related deaths occurred in either group. Six-month results suggest that Ranger DCB treatment effectively inhibited restenosis in symptomatic femoropopliteal disease, resulting in improved vessel patency and a low revascularization rate in the short term compared with uncoated balloon angioplasty.

  5. The dwell time and survival rates of PICC placement after balloon angioplasty in patient with unexpected central venous obstruction.

    Science.gov (United States)

    Kim, Ki Hyun; Park, Sang Woo; Chang, Il Soo; Yim, Younghee

    2016-09-21

    To evaluate the dwell time and actual survival rates of peripherally inserted central catheter (PICC) placements after balloon angioplasty in patients with unexpected central venous obstructions. Data were obtained on all PICC insertions performed in a tertiary care hospital from August 2008 to December 2013. Thirty-five PICCs attempted after balloon angioplasty in 25 patients (15 male and 10 female patients; mean age, 63 years). Fisher's exact test was used to test for differences in reasons for catheter removal between the groups of patients with stenosis or obstructions. Survival curves for PICC dwell time of all patients, stenosis group, and obstruction group were generated separately using Kaplan-Meier survival analysis and compared with log-rank tests. There were a total 21 obstructions and 14 stenoses. The overall technical success rate of PICC placement after balloon angioplasty was 94% (33 of 35 procedures). The PICC dwell time was determined for 27 PICCs and ranged from 4 to 165 days (mean, 39.6 days). Among all PICCs, 16 were removed early, resulting in an actual survival rate of 40.7% (11 of 27 PICCs). There were no significant differences in reasons for catheter removal between the stenosis and obstruction groups (p = 0.24). The dwell times for both groups were not significantly different by Kaplan-Meier analysis (p = 0.54). PICC placement after balloon angioplasty is a good treatment option for patients with unexpected central venous lesions, and offers high technical success rates. The actual survival rate was relatively lower (40.7%) than that from previous studies.

  6. Inexpensive Demonstration of Diffraction-Limited Telescope from NASA Stratospheric Balloons

    Science.gov (United States)

    Young, Elliot

    NASA s Balloon Program often flies payloads to altitudes of 120,000 ft or higher, above 99.5% of the atmosphere. At those altitudes, the imaging degradation due to atmospheric- induced wavefront errors is virtually zero. In 2009, the SUNRISE balloon mission quantified the wavefront errors with a Shack-Hartmann array and found no evidence of wavefront errors. This means that a large telescope on a balloon should be able to achieve diffraction-limited performance, provided it can be stabilized at a level that is finer than the diffraction limit. At visible wavelengths, the diffraction limit of a 1 or 2 m telescope is 0.1 arcsec or 0.05 arcsec, respectively. NASA recently demonstrated WASP (the Wallops Arc-Second Pointing system) on a balloon flight in October 2011, a coarse pointing system that kept a dummy telescope (24 ft long, 1500 lbs) stabilized at the 0.25 arcsec level. We propose to use an orthogonal transfer CCD (OTCCD) from MIT Lincoln Laboratory to improve the pointing to 0.05 arcsec, an order of magnitude better than the coarse pointing alone and sufficient to provide long integrations at the diffraction limit of a 2-m telescope. Imaging in visible wavelengths is an important new capability. Ground-based adaptive optics (AO) systems on 8-m and 10-m class telescope cannot effectively correct for atmospheric turbulence at wavelengths shorter than 1 μm; the atmospheric wavefront errors are larger at these wavelengths than in the infrared J-H-K bands. At present, only the Hubble Space Telescope can achieve 0.05 arcsec resolution images in visible wavelengths, a capability that is dramatically oversubscribed. With a camera based on an MIT/LL OTCCD, a 2-m balloon-borne telescope could match the spatial resolution of HST. Under this project (and in conjunction with a SWRI Internal Research proposal), we will perform ground tests of a motion-compensation camera based on an MIT/LL Orthogonal Transfer CCD (OTCCD). This device can shift charge in four directions

  7. Effect of routine rapid insertion of Bakri balloon tamponade on reducing hemorrhage from placenta previa during and after cesarean section.

    Science.gov (United States)

    Soyama, Hiroaki; Miyamoto, Morikazu; Sasa, Hidenori; Ishibashi, Hiroki; Yoshida, Masashi; Nakatsuka, Masaya; Takano, Masashi; Furuya, Kenichi

    2017-09-01

    To evaluate the effectiveness of routine rapid insertion of a Bakri balloon during cesarean section for placenta previa based on a retrospective control study. Women with singleton pregnancies who underwent cesarean section for placenta previa at our institution between 2003 and 2016 were enrolled. Between 2015 and 2016, women who routinely underwent balloon tamponade during cesarean section were defined as the balloon group. Between 2003 and 2014, women who underwent no hemostatic procedures except balloon tamponade were defined as the non-balloon group. The clinical outcomes of the two groups were retrospectively analyzed. Of the 266 women with placenta previa, 50 were in the balloon group and 216 were in the non-balloon group. The bleeding amounts were significantly smaller in the balloon group than in the non-balloon group: intraoperative bleeding (991 vs. 1250 g, p placenta previa.

  8. Experimental investigation of undesired stable equilibria in pumpkin shape super-pressure balloon designs

    Science.gov (United States)

    Schur, W. W.

    2004-01-01

    Excess in skin material of a pneumatic envelope beyond what is required for minimum enclosure of a gas bubble is a necessary but by no means sufficient condition for the existence of multiple equilibrium configurations for that pneumatic envelope. The very design of structurally efficient super-pressure balloons of the pumpkin shape type requires such excess. Undesired stable equilibria in pumpkin shape balloons have been observed on experimental pumpkin shape balloons. These configurations contain regions with stress levels far higher than those predicted for the cyclically symmetric design configuration under maximum pressurization. Successful designs of pumpkin shape super-pressure balloons do not allow such undesired stable equilibria under full pressurization. This work documents efforts made so far and describes efforts still underway by the National Aeronautics and Space Administration's Balloon Program Office to arrive on guidance on the design of pumpkin shape super-pressure balloons that guarantee full and proper deployment.

  9. A transition radiation detector for positron identification in a balloon-borne particle astrophysics experiment

    International Nuclear Information System (INIS)

    Barbarito, E.; Bellotti, R.; Cafagna, F.; Castellano, M.; Circella, M.; De Cataldo, G.; De Marzo, C.; Fusco, P.; Giglietto, N.; Mongelli, M.; Marangelli, B.; Perchiazzi, M.; Raino, A.; Sacchetti, A.; Spinelli, P.

    1995-01-01

    We have built and tested a transition radiation detector of about 76x80 cm 2 active surface to discriminate positrons from protons in an experiment performed on a balloon flight to search for primordial antimatter. The TRD is made of ten modules each consisting of a carbon fiber radiator followed by a multiwire proportional chamber. In order to achieve a proton-electron rejection factor of the order of 10 -3 with a strict limitation on power consumption to about 40 mW per chamber channel, as required by experimental constraints, we have developed a low power consumption ''cluster counting'' electronics. Different analysis procedures of calibration data are shown. In addition, comparisons of the performances of this detector are also made with a previous similar prototype equipped with standard fast electronics and similar detectors from other authors. ((orig.))

  10. Paclitaxel-Coated Balloon in Infrapopliteal Arteries: 12-Month Results From the BIOLUX P-II Randomized Trial (BIOTRONIK'S-First in Man study of the Passeo-18 LUX drug releasing PTA Balloon Catheter vs. the uncoated Passeo-18 PTA balloon catheter in subjects requiring revascularization of infrapopliteal arteries).

    Science.gov (United States)

    Zeller, Thomas; Beschorner, Ulrich; Pilger, Ernst; Bosiers, Marc; Deloose, Koen; Peeters, Patrick; Scheinert, Dierk; Schulte, Karl-Ludwig; Rastan, Aljoscha; Brodmann, Marianne

    2015-10-01

    The aim of BIOLUX P-II (BIOTRONIK'S-First in Man study of the Passeo-18 LUX drug releasing PTA Balloon Catheter vs. the uncoated Passeo-18 PTA balloon catheter in subjects requiring revascularization of infrapopliteal arteries) trial was to compare the safety and efficacy of a novel paclitaxel-coated drug-eluting balloon (DEB) versus an uncoated balloon (percutaneous transluminal angioplasty [PTA]) in de novo or native restenotic lesions of the infrapopliteal arteries in patients with claudication and critical limb ischemia. DEB have shown promising results in femoropopliteal lesions, but data for infrapopliteal lesions are scarce. In this prospective, multicenter, randomized first-in-man study, 72 patients were randomized 1:1 to either a Passeo-18 Lux DEB (Biotronik AG, Buelach, Switzerland) (n = 36) or Passeo-18 PTA (n = 36). Follow-up assessments were scheduled at 1, 6, and 12 months, with angiographic assessment at 6 months. Adverse events were adjudicated by an independent clinical events committee, and angiographic parameters were assessed by an independent core laboratory. The primary safety endpoint (a composite of all-cause mortality, target extremity major amputation, target lesion thrombosis, and target vessel revascularization at 30 days) was 0% in the DEB group versus 8.3% in the PTA group (p = 0.239). The primary performance endpoint (patency loss at 6 months) was 17.1% in the DEB group versus 26.1% in the PTA group (p = 0.298), and major amputations of the target extremity occurred in 3.3% versus 5.6% of the patients at 12 months, respectively. The Passeo-18 Lux DEB has been proven to be safe and effective in infrapopliteal lesions with comparable outcomes to PTA. Copyright © 2015 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.

  11. Anchoring barbs and balloon expandable stents: what is the risk of perforation and failed stent deployment?

    Science.gov (United States)

    Bown, M J; Harrison, G J; How, T V; Brennan, J A; Fisher, R K; Vallabhaneni, S R; McWilliams, R G

    2012-09-01

    Balloon expandable stents may on occasion be deployed in close proximity to the anchoring barbs of endovascular grafts. The aim of this study was to determine the risk and effect of balloon perforation by anchoring barbs and to assess whether these risks are different if the balloon is protected by a covered stent mounted upon it. A bench-top model was developed to mimic the penetration of anchoring barbs into the lumen of medium sized blood vessels. The model allowed variation of angle and depth of vessel penetration. Both bare balloons and those with covered stents mounted upon them were tested in the model to determine whether there was a risk of perforation and which factors increased or decreased this risk. All combinations of barb angle and depth caused balloon perforation but this was most marked when the barb was placed perpendicular to the long axis of the balloon. When the deployment of covered stents was attempted balloon perforation occurred in some cases but full stent deployment was achieved in all cases where the perforation was in the portion of the balloon covered by the stent. The only situation in which stent deployment failed was where the barb was intentionally placed in the uncovered portion of the balloon. This resulted in only partial deployment of the stent. Balloon rupture is a distinct possibility when deploying balloon-expandable stents in close proximity to anchoring barbs. Care should be taken in this circumstance to ensure that the barb is well away from the uncovered portion of the balloon. Copyright © 2012 European Society for Vascular Surgery. Published by Elsevier Ltd. All rights reserved.

  12. Sinus Balloon Dilation as Treatment for Acute Sphenoid Sinusitis with Impaired Vision for a Child

    Directory of Open Access Journals (Sweden)

    Yin Zhao

    2016-01-01

    Full Text Available This paper is about sinus balloon dilatation in treatment of acute left sphenoid sinusitis with left impaired vision in a child. Balloon catheter dilatation (BCD of the sinus ostia is a new technique. It has been shown to be a minimally invasive technique to manage chronic sinusitis. However, this method is rarely used in the treatment of acute sinusitis. So far, we know of no reported cases of sinus balloon dilatation in treatment of this case, especially for children.

  13. Intra-aortic balloon shape change: effects on volume displacement during inflation and deflation.

    Science.gov (United States)

    Khir, Ashraf William; Bruti, Gianpaolo

    2013-07-01

    It has been observed that operating the intra-aortic balloon at an angle to the horizontal resulted in a reduction of the volume displaced toward the coronary arteries and compromised afterload reduction. Therefore, the aim of this work is to examine whether changing the current balloon shape, which has not been altered for 40 years, could compensate for the negative hemodynamic effects due to angulation. We tested two tapered balloons, increasing diameter (TID) and decreasing diameter (TDD), and compared the results with those obtained from a standard cylindrical balloon. The balloons were tested in vitro at 60 beats/min and a static pressure of 90 mm Hg. The balloons were operated at four angles (0°, 20°, 30°, 45°), and the pressure at three locations along the balloon (base, middle, and tip) was also measured. Flow rate upstream of the tip of the balloon was also measured to indicate the flow displaced toward the coronary circulation. The relative volume displaced toward (VUTVi) and suctioned away from (VUTVd) the simulated ascending aorta, during inflation and deflation, respectively, is reduced when a standard cylindrical balloon is operated at an angle to the horizontal. The TDD provided the greatest VUTVi and also produced the largest pulse pressure during deflation. Although the TID provided less VUTVi and VUTVd at smaller angles, it was not markedly affected by the change of angle. According to these results, different balloon shapes analyzed, with comparable volume to that of a cylindrical balloon, produced greater inflation and deflation benefits, at the horizontal and at a range of angles to the horizontal. Further investigations are required to optimize the shape of the tapered balloons to fit into the available physiological space. © 2013 Wiley Periodicals, Inc. and International Center for Artificial Organs and Transplantation.

  14. Design and evaluation of a continuum robot with extendable balloons

    Directory of Open Access Journals (Sweden)

    E. Y. Yarbasi

    2018-02-01

    Full Text Available This article presents the design and preliminary evaluation of a novel continuum robot actuated by two extendable balloons. Extendable balloons are utilized as the actuation mechanism of the robot, and they are attached to the tip from their slack sections. These balloons can extend very much in length without having a significant change in diameter. Employing two balloons in an axially extendable, radially rigid flexible shaft, radial strain becomes constricted, allowing high elongation. As inflated, the balloons apply a force on the wall of the tip, pushing it forward. This force enables the robot to move forward. The air is supplied to the balloons by an air compressor and its flow rate to each balloon can be independently controlled. Changing the air volumes differently in each balloon, when they are radially constricted, orients the robot, allowing navigation. Elongation and force generation capabilities and pressure data are measured for different balloons during inflation and deflation. Afterward, the robot is subjected to open field and maze-like environment navigation tests. The contribution of this study is the introduction of a novel actuation mechanism for soft robots to have extreme elongation (2000 % in order to be navigated in substantially long and narrow environments.

  15. Wave power absorption by a submerged balloon fixed to the sea bed

    DEFF Research Database (Denmark)

    Kurniawan, Adi; Greaves, Deborah

    2016-01-01

    The possibility of absorbing wave energy using a submerged balloon fixed to the sea bed is investigated. The balloon is in the form of a fabric encased within an array of meridional tendons which terminate at a point at the top of the balloon and at some radius at the bottom. The expansion...... and contraction of the balloon in waves pump air via a turbine into and out of a chamber of constant volume. A more refined model than that used by Kurniawan and Greaves [Proc. 2nd Offshore Energy and Storage Symposium , 2015] predicts a similarly broad-banded response, but the maximum absorption is less than...

  16. Balloon angioplasty, with and without stenting, versus medical therapy for hypertensive patients with renal artery stenosis.

    Science.gov (United States)

    Jenks, Sara; Yeoh, Su Ern; Conway, Bryan R

    2014-01-01

    the review. The overall quality of evidence included in this review was moderate. Limited pooling of results was possible due to the variable presentation of some of the trial outcomes. Meta-analysis of the four studies reporting change in diastolic blood pressure (BP) found a small improvement in diastolic BP in the angioplasty group (MD -2.00 mmHg; 95% CI -3.72 to -0.27) whilst the meta-analysis of the five studies reporting change in systolic BP did not find any evidence of significant improvement (MD -1.07 mmHg; 95% CI -3.45 to 1.30). There was no significant effect on renal function as measured by serum creatinine (MD -7.99 µmol/L; 95% CI -22.6 to 6.62). Meta-analysis of the three studies that reported the mean number of antihypertensive drugs found a small decrease in antihypertensive drug requirements for the angioplasty group (MD -0.18; 95% CI -0.34 to -0.03). Repeat angiography was only performed on a small number of participants in a single trial and it was therefore not possible to comment on restenosis of the renal artery following balloon angioplasty. Based on the results of the seven studies that reported cardiovascular and renal clinical outcomes there were no differences in cardiovascular (OR 0.91; 95% CI 0.75 to 1.11) or renal adverse events (OR 1.02; 95% CI 0.75 to 1.38) between the angioplasty and medical treatment groups. A small number of procedural complications of balloon angioplasty were reported (haematoma at the site of catheter insertion (6.5%), femoral artery pseudoaneurysm (0.7%), renal artery or kidney perforation or dissection (2.5%) as well as peri-procedural deaths (0.4%)). No side effects of medical therapy were reported. The available data are insufficient to conclude that revascularisation in the form of balloon angioplasty, with or without stenting, is superior to medical therapy for the treatment of atherosclerotic renal artery stenosis in patients with hypertension. However, balloon angioplasty results in a small improvement in

  17. Cerebrospinal Fluid Enhancement on Fluid Attenuated Inversion Recovery Images After Carotid Artery Stenting with Neuroprotective Balloon Occlusions: Hemodynamic Instability and Blood–Brain Barrier Disruption

    International Nuclear Information System (INIS)

    Ogami, Ryo; Nakahara, Toshinori; Hamasaki, Osamu; Araki, Hayato; Kurisu, Kaoru

    2011-01-01

    Purpose: A rare complication of carotid artery stenting (CAS), prolonged reversible neurological symptoms with delayed cerebrospinal fluid (CSF) space enhancement on fluid attenuated inversion recovery (FLAIR) images, is associated with blood–brain barrier (BBB) disruption. We prospectively identified patients who showed CSF space enhancement on FLAIR images. Methods: Nineteen patients—5 acute-phase and 14 scheduled—underwent 21 CAS procedures. Balloon catheters were navigated across stenoses, angioplasty was performed using a neuroprotective balloon, and stents were placed with after dilation under distal balloon protection. CSF space hyperintensity or obscuration on FLAIR after versus before CAS indicated CSF space enhancement. Correlations with clinical factors were examined. Results: CSF space was enhanced on FLAIR in 12 (57.1%) cases. Postprocedural CSF space enhancement was significantly related to age, stenosis rate, acute-stage procedure, and total occlusion time. All acute-stage CAS patients showed delayed enhancement. Only age was associated with delayed CSF space enhancement in scheduled CAS patients. Conclusions: Ischemic intolerance for severe carotid artery stenosis and temporary neuroprotective balloon occlusion, causing reperfusion injury, seem to be the main factors that underlie BBB disruption with delayed CSF space enhancement shortly after CAS, rather than sudden poststenting hemodynamic change. Our results suggest that factors related to hemodynamic instability or ischemic intolerance seem to be associated with post-CAS BBB vulnerability. Patients at risk for hemodynamic instability or with ischemic intolerance, which decrease BBB integrity, require careful management to prevent intracranial hemorrhagic and other post-CAS complications.

  18. Clinical application of preoperative embolization of tumor feeding artery combined with intraoperative balloon occlusion of the abdominal aorta in the resection of sacral tumors

    International Nuclear Information System (INIS)

    Chen Wenhua; Wang Qi; He Zhongming; Zhou Jian; Wang Yimin; Wang Jie

    2012-01-01

    Objective: To investigate the clinical application of preoperative embolization of tumor feeding artery combined with intraoperative balloon occlusion of the abdominal aorta in performing the surgical resection of sacral tumors. Methods: Conventional surgical excision of sacral tumors was employed in 24 patients with sacral tumors (control group), while preoperative embolization of tumor feeding artery combined with intraoperative balloon occlusion of the abdominal aorta was carried out in 32 patients with sacral tumors (study group). The operation time, blood loss during the surgery and the one-year recurrence rate of both groups were documented, and the results were statistically analyzed. Results: Angiography showed that in the study group the sacral tumors were supplied by several vessels, and these feeding arteries were occluded separately. The tumors were successfully removed in all patients with the help of intraoperative balloon occlusion of the abdominal aorta. During the surgery, the surgical area was clearly exposed and the blood loss wa remarkably reduced. After the surgery, no ectopic vascular embolization, renal ischemia, limb ischemia or other complications occurred. Statistically significant difference in the operation time, blood loss during the surgery and the one-year recurrence rate existed between the two groups (P<0.05). Conclusion: Preoperative embolization of tumor feeding artery combined with intraoperative balloon occlusion of the abdominal aorta can effectively shorten the operation time, reduce the blood loss during the surgery and provide a clear surgical field, and thus the surgical safety can be significantly ensured. (authors)

  19. Double-balloon catheter and sequential vaginal prostaglandin E2 versus vaginal prostaglandin E2 alone for induction of labor after previous cesarean section.

    Science.gov (United States)

    Kehl, Sven; Weiss, Christel; Wamsler, Michael; Beyer, Jana; Dammer, Ulf; Heimrich, Jutta; Faschingbauer, Florian; Sütterlin, Marc; Beckmann, Matthias W; Schleussner, Ekkehard

    2016-04-01

    To evaluate the efficacy of inducing labor using a double-balloon catheter and vaginal prostaglandin E2 (PGE2) sequentially, in comparison with vaginal PGE2 alone after previous cesarean section. A total of 264 pregnant women with previous cesarean section undergoing labor induction at term were included in this prospective multicentre cohort study. Induction of labor was performed either by vaginal PGE2 gel or double-balloon catheter followed by vaginal PGE2. The primary outcome measure was the cesarean section rate. The cesarean section rate was 37 % without any statistically significant difference between the two groups (PGE2: n = 41, 37 % vs. balloon catheter/PGE2: n = 41, 42 %; P = 0.438). The median (range) number of applications of PGE2 [2 (1-10) versus 1 (0-8), P cesarean section were "no previous vaginal delivery" (OR 5.391; CI 2.671-10.882) and "no oxytocin augmentation during childbirth" (OR 2.119; CI 1.215-3.695). The sequential application of double-balloon catheter and vaginal PGE2 is as effective as the sole use of vaginal PGE2 with less applications and total amount of PGE2.

  20. Balloon flight test of a Compton telescope based on scintillators with silicon photomultiplier readouts

    Science.gov (United States)

    Bloser, P. F.; Legere, J. S.; Bancroft, C. M.; Ryan, J. M.; McConnell, M. L.

    2016-03-01

    We present the results of the first high-altitude balloon flight test of a concept for an advanced Compton telescope making use of modern scintillator materials with silicon photomultiplier (SiPM) readouts. There is a need in the fields of high-energy astronomy and solar physics for new medium-energy gamma-ray ( 0.4-10 MeV) detectors capable of making sensitive observations of both line and continuum sources over a wide dynamic range. A fast scintillator-based Compton telescope with SiPM readouts is a promising solution to this instrumentation challenge, since the fast response of the scintillators permits both the rejection of background via time-of-flight (ToF) discrimination and the ability to operate at high count rates. The Solar Compton Telescope (SolCompT) prototype presented here was designed to demonstrate stable performance of this technology under balloon-flight conditions. The SolCompT instrument was a simple two-element Compton telescope, consisting of an approximately one-inch cylindrical stilbene crystal for a scattering detector and a one-inch cubic LaBr3:Ce crystal for a calorimeter detector. Both scintillator detectors were read out by 2×2 arrays of Hamamatsu S11828-3344 MPPC devices. Custom front-end electronics provided optimum signal rise time and linearity, and custom power supplies automatically adjusted the SiPM bias voltage to compensate for temperature-induced gain variations. A tagged calibration source, consisting of 240 nCi of 60Co embedded in plastic scintillator, was placed in the field of view and provided a known source of gamma rays to measure in flight. The SolCompT balloon payload was launched on 24 August 2014 from Fort Sumner, NM, and spent 3.75 h at a float altitude of 123,000 ft. The instrument performed well throughout the flight. After correcting for small ( 10%) residual gain variations, we measured an in-flight ToF resolution of 760 ps (FWHM). Advanced scintillators with SiPM readouts continue to show great promise for

  1. Balloon flight test of a Compton telescope based on scintillators with silicon photomultiplier readouts

    International Nuclear Information System (INIS)

    Bloser, P.F.; Legere, J.S.; Bancroft, C.M.; Ryan, J.M.; McConnell, M.L.

    2016-01-01

    We present the results of the first high-altitude balloon flight test of a concept for an advanced Compton telescope making use of modern scintillator materials with silicon photomultiplier (SiPM) readouts. There is a need in the fields of high-energy astronomy and solar physics for new medium-energy gamma-ray (~0.4–10 MeV) detectors capable of making sensitive observations of both line and continuum sources over a wide dynamic range. A fast scintillator-based Compton telescope with SiPM readouts is a promising solution to this instrumentation challenge, since the fast response of the scintillators permits both the rejection of background via time-of-flight (ToF) discrimination and the ability to operate at high count rates. The Solar Compton Telescope (SolCompT) prototype presented here was designed to demonstrate stable performance of this technology under balloon-flight conditions. The SolCompT instrument was a simple two-element Compton telescope, consisting of an approximately one-inch cylindrical stilbene crystal for a scattering detector and a one-inch cubic LaBr 3 :Ce crystal for a calorimeter detector. Both scintillator detectors were read out by 2×2 arrays of Hamamatsu S11828-3344 MPPC devices. Custom front-end electronics provided optimum signal rise time and linearity, and custom power supplies automatically adjusted the SiPM bias voltage to compensate for temperature-induced gain variations. A tagged calibration source, consisting of ~240 nCi of 60 Co embedded in plastic scintillator, was placed in the field of view and provided a known source of gamma rays to measure in flight. The SolCompT balloon payload was launched on 24 August 2014 from Fort Sumner, NM, and spent ~3.75 h at a float altitude of ~123,000 ft. The instrument performed well throughout the flight. After correcting for small (~10%) residual gain variations, we measured an in-flight ToF resolution of ~760 ps (FWHM). Advanced scintillators with SiPM readouts continue to show great

  2. Balloon flight test of a Compton telescope based on scintillators with silicon photomultiplier readouts

    Energy Technology Data Exchange (ETDEWEB)

    Bloser, P.F., E-mail: Peter.Bloser@unh.edu; Legere, J.S.; Bancroft, C.M.; Ryan, J.M.; McConnell, M.L.

    2016-03-11

    We present the results of the first high-altitude balloon flight test of a concept for an advanced Compton telescope making use of modern scintillator materials with silicon photomultiplier (SiPM) readouts. There is a need in the fields of high-energy astronomy and solar physics for new medium-energy gamma-ray (~0.4–10 MeV) detectors capable of making sensitive observations of both line and continuum sources over a wide dynamic range. A fast scintillator-based Compton telescope with SiPM readouts is a promising solution to this instrumentation challenge, since the fast response of the scintillators permits both the rejection of background via time-of-flight (ToF) discrimination and the ability to operate at high count rates. The Solar Compton Telescope (SolCompT) prototype presented here was designed to demonstrate stable performance of this technology under balloon-flight conditions. The SolCompT instrument was a simple two-element Compton telescope, consisting of an approximately one-inch cylindrical stilbene crystal for a scattering detector and a one-inch cubic LaBr{sub 3}:Ce crystal for a calorimeter detector. Both scintillator detectors were read out by 2×2 arrays of Hamamatsu S11828-3344 MPPC devices. Custom front-end electronics provided optimum signal rise time and linearity, and custom power supplies automatically adjusted the SiPM bias voltage to compensate for temperature-induced gain variations. A tagged calibration source, consisting of ~240 nCi of {sup 60}Co embedded in plastic scintillator, was placed in the field of view and provided a known source of gamma rays to measure in flight. The SolCompT balloon payload was launched on 24 August 2014 from Fort Sumner, NM, and spent ~3.75 h at a float altitude of ~123,000 ft. The instrument performed well throughout the flight. After correcting for small (~10%) residual gain variations, we measured an in-flight ToF resolution of ~760 ps (FWHM). Advanced scintillators with SiPM readouts continue to show

  3. Special Considerations for Qualifying Thin Films for Supper Pressure Pumpkin Ultra Long Duration Balloon (ULDB) Missions

    Science.gov (United States)

    Said, M.

    Pumpkin type super pressure balloons require much less stringent mechanical requirements on the envelope film material when compared to spherical super pressure type balloons. However, since suitable thin films are typically viscoelastic in nature, their creep characteristics must be fully characterized and must not exceed specific and predetermined design limits. Proper assessment of materials limits to meet these design limits requires creep-load-temperature data that characterizes the performance of the material over a time that exceeds the duration of the design service life by some specified margin. Contrary to the behavior of materials with purely elastic response, visco-elastic materials such as these considered for the ULDB design, change their geometry under sustained loading over time. This change is usually reflected by exhibiting a significant visco-elastic component over the service life of the mission. For that regime of large visco-elastic response, where the material is highly nonlinear, a certain load-temperature threshold can be reached where the creep is limited by an asymptote that depends on both the temperature and load level. Such creep is recoverable, although the recovery period may be much longer than the 100 day design service life of the ULDB structure plus the factor of safety required for the design. For a typical flight, the most significant creep occurs at the highest temperature, which also produces the highest internal pressure. At mid- latitudes a significant portion of the service life is spent at night, i.e. at low temperature and low load; for the ULDB film, this nighttime contribution to creep is insignificant in comparison to any daytime contribution. By contrast, flight exposure in an Antarctic summer is at an almost constant high temperature and corresponding high pressure. This response behavior must be sufficiently characterized to serve the needs of the structural design and performance predictions of the vehicle in

  4. Long-Duration Altitude-Controlled Balloons for Venus: A Feasibility Study Informed by Balloon Flights in Remote Environments on Earth

    Science.gov (United States)

    Voss, P. B.; Nott, J.; Cutts, J. A.; Hall, J. L.; Beauchamp, P. M.; Limaye, S. S.; Baines, K. H.; Hole, L. R.

    2013-12-01

    In situ exploration of the upper atmosphere of Venus, approximately 65-77 km altitude, could answer many important questions (Limaye 2013, Crisp 2013). This region contains a time-variable UV absorber of unknown composition that controls many aspects of the heat balance on Venus. Understanding the composition and dynamics of this unknown absorber is an important science goal; in situ optical and chemical measurements are needed. However, conventional approaches do not provide access to this altitude range, repeated traverses, and a mission lifetime of several months needed to effectively carry out the science. This paper examines concepts for altitude-controlled balloons not previously flown on planetary missions that could potentially provide the desired measurements. The concepts take advantage of the fact that at 60 km altitude, for example, the atmospheric density on Venus is about 40% of the sea-level density on earth and the temperature is a moderate 230 K. The solar flux is approximately double that on earth, creating some thermal challenges, but making photovoltaic power highly effective. Using a steady-state thermodynamic model and flight data from Earth, we evaluate the suitability of two types of altitude-controlled balloons for a potential mission on Venus. Such balloons could repeatedly measure profiles, avoid diurnal temperature extremes, and navigate using wind shear. The first balloon design uses air ballast (AB) whereby ambient air can be compressed into or released from a constant-volume balloon, causing it to descend or ascend accordingly. The second design uses lift-gas compression (LGC) to change the volume of a zero-pressure balloon, thereby changing its effective density and altitude. For an altitude range of 60-75 km on Venus, we find that the superpressure volume for a LGC balloon is about 5% of that needed for an AB balloon while the maximum pressurization is the same for both systems. The compressor work per km descent of the LGC balloon

  5. Fasting and meal-induced CCK and PP secretion following intragastric balloon treatment for obesity.

    Science.gov (United States)

    Mathus-Vliegen, Elisabeth M H; de Groot, Gerrit H

    2013-05-01

    Satiety is centrally and peripherally mediated by gastrointestinal peptides and the vagal nerve. We aimed to investigate whether intragastric balloon treatment affects satiety through effects on fasting and meal-stimulated cholecystokinin (CCK) and pancreatic polypeptide (PP) secretion. Patients referred for obesity treatment were randomised to 13 weeks of sham treatment followed by 13 weeks of balloon treatment (group 1; sham/balloon) or to twice a 13-week period of balloon treatment (group 2; balloon/balloon). Blood sampl