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Sample records for balloon kyphoplasty performed

  1. Balloon Kyphoplasty: An Effective Treatment for Kummell Disease?

    Science.gov (United States)

    Kim, Pius

    2016-01-01

    Objective The purpose of this study was to evaluate the efficacy of balloon kyphoplasty for treating Kummel disease accompanying severe osteoporosis. Methods Twelve patients with single-level Kummell disease accompanied by severe osteoporosis were enrolled in this investigation. After postural reduction for 1 or 2 days, balloon kyphoplasty was performed on the collapsed vertebrae. Clinical results, radiological parameters, and related complications were assessed at 7 days, 1 month and 6 months after the procedure. Results Prior to kyphoplasty, the mean pain score (according to the visual analogue scale) was 8.0. Seven days after the procedure, this score improved to 2.5. Despite the significant improvement compared to preoperative value, the score increased to 4.0 at 6 months after the procedure. The mean preoperative vertebral height loss was 55.4%. Kyphoplasty reduced this loss to 31.6%, but it increased to 38.7% at 6 months after the procedure. The kyphotic angle improved significantly from 22.4°±4.9° (before the procedure) to 10.1°±3.8° after surgery, However, the improved angle was not maintained 6 months after the procedure. The mean correction loss for the kyphotic deformity was 7.2° at 6 months after the procedure. Three out of 12 patients sustained adjacent fractures after balloon kyphoplasty within 6 months. Conclusion Although balloon kyphoplasty for treating Kummell disease is known to provide stabilization and pain relief, it may be associated with the development of adjacent fractures and aggravated kyphosis. PMID:27799987

  2. Early clinical outcome and complications related to balloon kyphoplasty

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    Martin Bergmann

    2012-06-01

    urinary tract infection, and 2 patients died during hospitalization. Twenty-four patients (8.1% returned because of new pain events and 23 patients reported a new painful fracture. Balloon kyphoplasty is a save and effective procedure to treat patients with painful vertebral compression fractures. Rapid patient mobilization after kyphoplasty, as well as a prompt reintegration into the social environment, are possible. Compared to other surgical procedures, especially in patients with an average age of 75 years, balloon kyphoplasty seems to offer some advantages. However, the procedure still has a potential for serious complications and should be performed by well trained personnel.

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

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    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.)

  4. Single-balloon versus double-balloon bipedicular kyphoplasty for osteoporotic vertebral compression fractures.

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    Wang, Heng; Sun, Zhenzhong; Wang, Zhiwen; Jiang, Weimin

    2015-04-01

    Twenty-eight patients with osteoporotic vertebral compression fractures (OVCF) were treated with single-balloon bipedicular kyphoplasty (Group A), and 40 patients were treated with double-balloon bipedicular kyphoplasty (Group B). Visual Analogue Scale (VAS) score, vertebral height, and kyphotic angle (KA) were evaluated pre-operatively, post-operatively (3 days after surgery) and at final follow-up. Operative time, X-ray exposure frequency and costs were recorded. The mean operative time and X-ray exposure frequency in Group A were greater than in Group B (pkyphoplasty is a safe and cost-effective surgical method for the treatment of OVCF. It can achieve pain relief comparable with double-balloon bipedicular kyphoplasty. However, double-balloon bipedicular kyphoplasty is more efficacious in terms of the restoration of vertebral height and reduction of KA, and the operative time and X-ray exposure frequency are lower.

  5. Percutaneous anterolateral balloon kyphoplasty for metastatic lytic lesions of the cervical spine.

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    Lykomitros, Vasilis; Anagnostidis, Kleovoulos S; Alzeer, Ziad; Kapetanos, George A

    2010-11-01

    The purpose of our report is to describe a new application of kyphoplasty, the percutaneous anterolateral balloon kyphoplasty that we performed in two cases of metastatic osteolytic lesions in cervical spine. The first patient, aged 48 years, with primary malignancy in lungs had two metastatic lesions in C2 and C6 vertebrae. Patient's complaints were about pain and restriction of movements (due to the pain) in the cervical spine. The second patient, aged 70 years, with primary malignancy in stomach, had multiple metastatic lesions in thoracolumbar spine and C3, C4 and C5 vertebrae without neurological symptoms. The main symptoms were from cervical spine with severe pain even in bed rest and systematic use of opiate-base analgesic. The preoperative status was evaluated with X-rays, CT scan, MRI scan and with Karnofsky score and visual analogue pain (VAS) scale. Both patients underwent percutaneous anterolateral balloon kyphoplasty via the anterolateral approach in cervical spine under general anaesthesia. No clinical complications occurred during or after the procedure. Both patients experienced pain relief immediately after balloon kyphoplasty and during the following days. The stiffness also resolved rapidly and cervical collars were removed. VAS score significantly improved from 85 and 95 preoperatively to 30 in both patients. Karnofsky score showed also improvement from 40 and 30 preoperatively to 80 and 70, respectively, at the final follow-up (7 months after the procedure). Fluoroscopy-guided percutaneous anterolateral balloon kyphoplasty proved to be safe and effective minimally invasive procedure for metastatic osteolytic lesions of the cervical spine, reducing pain and avoiding vertebral collapse. Experience and attention are necessary in order to avoid complications.

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

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    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.)

  7. Comparison of nonnavigated and 3-dimensional image-based computer navigated balloon kyphoplasty.

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    Sembrano, Jonathan N; Yson, Sharon C; Polly, David W; Ledonio, Charles Gerald T; Nuckley, David J; Santos, Edward R G

    2015-01-01

    Balloon kyphoplasty is a common treatment for osteoporotic and pathologic compression fractures. Advantages include minimal tissue disruption, quick recovery, pain relief, and in some cases prevention of progressive sagittal deformity. The benefit of image-based navigation in kyphoplasty has not been established. The goal of this study was to determine whether there is a difference between fluoroscopy-guided balloon kyphoplasty and 3-dimensional image-based navigation in terms of needle malposition rate, cement leakage rate, and radiation exposure time. The authors compared navigated and nonnavigated needle placement in 30 balloon kyphoplasty procedures (47 levels). Intraoperative 3-dimensional image-based navigation was used for needle placement in 21 cases (36 levels); conventional 2-dimensional fluoroscopy was used in the other 9 cases (11 levels). The 2 groups were compared for rates of needle malposition and cement leakage as well as radiation exposure time. Three of 11 (27%) nonnavigated cases were complicated by a malpositioned needle, and 2 of these had to be repositioned. The navigated group had a significantly lower malposition rate (1 of 36; 3%; P=.04). The overall rate of cement leakage was also similar in both groups (P=.29). Radiation exposure time was similar in both groups (navigated, 98 s/level; nonnavigated, 125 s/level; P=.10). Navigated kyphoplasty procedures did not differ significantly from nonnavigated procedures except in terms of needle malposition rate, where navigation may have decreased the need for needle repositioning.

  8. Vertebroplasty and balloon kyphoplasty versus conservative treatment for osteoporotic vertebral compression fractures

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    Yuan, Wei-Hsin; Hsu, Hui-Chen; Lai, Kaun-Lin

    2016-01-01

    Abstract Objective: Although the majority of available evidence suggests that vertebroplasty and kyphoplasty can relieve pain associated with vertebral compression fractures (VCFs) and improve function, some studies have suggested results are similar to those of placebo. The purpose of this meta-analysis was to compare the outcomes of vertebroplasty and kyphoplasty with conservative treatment in patients with osteoporotic VCFs. Methods: Medline, Cochrane, and Embase databases were searched until January 31, 2015 using the keywords: vertebroplasty, kyphoplasty, compression fracture, osteoporotic, and osteoporosis. Inclusion criteria were randomized controlled trials (RCTs) in which patients with osteoporosis, and VCFs were treated with vertebroplasty/kyphoplasty or conservative management. Outcome measures were pain, function, and quality of life. Standardized differences in means were calculated as a measure of effect size. Main results: Ten RCTs were included. The total number of patients in the treatment and control groups was 626 and 628, respectively, the mean patient age ranged from 64 to 80 years, and the majority was female. Vertebroplasty/kyphoplasty was associated with greater pain relief (pooled standardized difference in means = 0.82, 95% confidence interval [CI]: 0.374–1.266, P kyphoplasty was associated with higher quality of life (pooled standardized difference in means = 1.545, 95% CI: 1.293–1.798, P kyphoplasty studies that reported pain data, however, indicated that vertebroplasty provided greater pain relief than conservative treatment but kyphoplasty did not. Conclusion: Vertebroplasty may provide better pain relief than balloon kyphoplasty in patients with osteoporotic VCFs, both may improve function, and their effect on quality of life is less clear. PMID:27495096

  9. Disadvantages of Balloon Kyphoplasty with PMMA - a Clinical and Biomechanical Statement

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    Becker S

    2011-01-01

    Full Text Available Balloon kyphoplasty (BKP and vertebroplasty (VP are clinically effective procedures. However, BKP has been occasionally associated with failure, although the cause has not been established thus far. We believe that, especially in patients with severe osteoporosis and osteonecrosis, BKP fails due to the so-called stress shielding effect and the stiffness of cement. In these patients, other bone-preserving kyphoplastic procedures and vertebroplasty, as well as recently introduced cements adjusted to the severity of osteoporosis, might be beneficial. Furthermore, it is essential to achieve complete straightening intraoperatively when performing BKP, because any persistent residual kyphosis will aggravate the burden on the adjacent vertebral bodies following the creation of a cavity filled with cement. Therefore, it would be meaningful to consider alternative bone-preserving kyphoplastic measures instead of BKP. In cases of older fractures, one should consider the use of VP and the recently introduced cements.

  10. Preliminary experience with balloon kyphoplasty for the treatment of painful osteoporotic compression fractures; Ballon-Kyphoplastie zur Behandlung schmerzhafter osteoporotischer Wirbelkoerperfrakturen - Technik und erste Ergebnisse

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    Wilhelm, K.; Urbach. H. [Bonn Univ. (Germany). Radiologische Klinik; Stoffel, M; Ringel, F.; Rao, G.; Roesseler, L.; Meyer, B. [Bonn Univ. (Germany). Neurochirurgische Klinik

    2003-12-01

    Purpose: To describe the technique and to evaluate the safety and efficacy of percutaneous kyphoplasty as a new treatment in patients with painful osteoporotic vertebral body compression fractures of the lumbar and thoracic spine. Materials and Methods: In this prospective study balloon kyphoplasty was performed in 34 consecutive patients (25 females, 9 males; mean age 75 years) with 56 painful osteoporotic vertebral fractures (from T6-L5), of which 22 showed a posterior wall involvement and -retropulsion on preoperative CT. The median duration of symptoms was 9.7 weeks. Symtomatic levels were identified by correlating the clinical presentation with MRI, conventional radiographs and CT including bone-densitometry. Pre- and postoperative examinations (radiographs, CT) as well as Karnofsky and visual analogy pain scores (Visual Analog Scale=VAS) were documented and compared to evaluate the success of the procedure. Results: The median Karnofsky score improved from 40% (pre-) to 70% (post-treatment). Simultaneously, median pain scores (VAS) decreased from 64 (pre-) to 21 (post-treatment) (p<0.001). Perioperative morbidity included one transient L2 nerve root bruise. The procedure led to a partial restoration of the height of the vertebral body by reducing the median sagittal index from 11.5 to 5 . In none of our patients, the procedure led to worsening of the fracture-induced narrowing of the spinal canal. Clinically asymptomatic cement leakage occurred in 10 cases, with leakage 4 times into the paraspinal space, 3 times into the spinal canal and 3 times into the disc space. Conclusion: Balloon kyphoplasty is a safe and effective procedure. It is applicable even in fractures with posterior wall involvement since it is a low-pressure technique in contrast to vertebroplasty and restores vertebral body height partially. It results in immediate clinical improvement of mobility and pain relief. While short-term results are excellent, follow-up data have to be awaited for

  11. 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.

  12. Prone position in balloon kyphoplasty leads to no secondary vertebral compression fractures in osteoporotic spine – a MRI study

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    Spalteholz, Matthias

    2014-12-01

    Full Text Available Purpose: Vertebral compression fractures are the most common fractures in the elderly. Long lasting pain and deformity is responsible for consecutive impairment with markedly reduced life quality, increased morbidity and mortality. The beneficial effects of balloon kyphoplasty are verified in many studies. Subsequent fracture risk is not finally clarified, cement related risks and deformity related risks are discussed. There is less knowledge about the risk of bone marrow edema and new fractures during balloon kyphoplasty procedure. The goal of this study is to examine, if prone position during kyphoplasty is an independent risk factor for new fractures in the osteoporotic spine. Methods: Consecutive MRI study of 20 patients with fresh, non-traumatic thoracolumbar vertebral compression fractures and balloon kyphoplasty treatment. MRI Scans of the thoracolumbar spine were obtained after surgery, before patients have been mobilized. Specific MRI changes like new bone marrow edema, signal intensity changes in adjacent and remote segments and new fractures were assessed by specialized neuro-radiologist. Results: 20 MR images were examined within 48 hours after balloon kyphoplasty procedure. 85% did not show bone marrow edema extent changes after kyphoplasty. We found minor increase of bone marrow edema within the augmented vertebral body in 3 cases. We did not find any new bone marrow edema and no new fractures in adjacent and remote segments after balloon kyphoplasty treatment.Conclusion: Prone position leads to no new bone marrow edema and no new fractures in the osteoporotic spine. Accordingly, prone position has no risk for adjacent level fractures in osteoporotic spines.

  13. Treatment effect of balloon kyphoplasty and Sky expander kyphoplasty on vertebral compression fracture: a Meta-analysis

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    Wei HE

    2013-04-01

    Full Text Available Objective  To evaluate the treatment effect of balloon kyphoplasty (Pkp and Sky expander kyphoplasty (Sky on vertebral compression fracture, and provide a theoretical basis for clinical application. Methods  The database of Ovid medline, PubMed, Web of science, EMbase and CNKI from Jan. 1995 to Oct. 2012 were retrieved with computer, and relevant journals were manually retrieved, for the collection of the literature of therapeutic studies on treatment of vertebral compression fracture with Pkp and Sky method. The literature collected was then selected according to the inclusion and exclusion criteria, and analyzed by Meta-analysis software RevMan 5.0.25. Results  A total of 4 papers were selected based on that criterion, including 146 cases of Pkp group and 83 cases of Sky group. Random effect model analysis showed no significant difference existed between the two groups regarding postoperative anterior height and column height of vertebral body, Cobb angle and pain relieve (SMD=0.50, 95%CI -0.27–1.27; SMD=0.33, 95%CI -0.11–0.77; SMD=0.46, 95%CI -0.74–1.66; SMD=-0.09, 95%CI -0.37–0.18. However, the subgroup analysis showed the effect of Sky was better than that of Pkp on restoring anterior height and column height of vertebral body and Cobb angle. Conclusion  No significant difference was found regarding the treatment effect between Pkp and Sky method in the treatment of osteoporotic vertebral compression fracture, but the clinical effect of Sky was better because of fewer complications and lower medical cost.

  14. Percutaneous balloon kyphoplasty of osteoporotic vertebral compression fractures with intravertebral cleft

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    Bao Chen

    2014-01-01

    Full Text Available Background: Intravertebral cleft is a structural change in osteoporotic vertebral compression fractures (OVCF, which is the manifestation of ischemic vertebral osteonecrosis complicated with fracture nonunion and pseudoarthrosis and appears in the late stage of OVCF. Despite numerous studies on OVCF, few aim to evaluate the clinicoradiological characteristics and clinical significance of intravertebral cleft in OVCF. This study investigates clinicoradiological characteristics of intravertebral cleft in OVCF and the effect on the efficacy of percutaneous balloon kyphoplasty (PKP. Materials and Methods: PKP was performed on 139 OVCF patients without intravertebral cleft (group A and 44 OVCF patients with intravertebral cleft (group B. The frequency distribution of the affected vertebral body, bone cement infusion volume, imaging manifestation, leakage rate and type, preoperative and postoperative height of the affected vertebral body, visual analog scale (VAS and Oswestry disability index (ODI score were evaluated. Results: Significant differences were found in the frequency distribution of the affected vertebral body and bone cement leakage type between the two groups ( P 0.05 were not detected. In both groups, the postoperative height of the affected vertebral body was significantly improved ( P 0.05. Conclusion: Intravertebral cleft exhibits specific clinical and imaging as well as bone cement formation characteristics. PKP can effectively restore the affected vertebral body height, alleviate pain, and improve daily activity function of patients.

  15. The Use of Posterior Short Segment Screw Fixation and Balloon Kyphoplasty in the Surgical Treatment of Traumatic Vertebral Fracture: A Case Report

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    Sevim Ondul

    2012-04-01

    Full Text Available Surgical treatments for the fracture of the spine are frequently used in clinical practice. Posterior spine stabilization with transpedicular screw fixation is one of the surgical treatment methods in the surgical treatment of spinal fractures. A 48-year old male patient was admitted to our hospital with a diagnosis of the L1 compression fracture resulting from traumatic injury. Posterior transpedicular screws were placed at one level above and one level below of the fractured vertebrate. Anterior column of the fractured vertebrate was strengthened with balloon kyphoplasty application. The system was completed with the placement of transverse rods. Fusion with allograft was performed. According to the ASIA neurological grading system, the patient was assessed as Grade E. 10 cm skin and fascia incision was done. Operation time of about 70 minutes and blood loss was less than 100 cc. The patient was mobilized on the first day of surgery and was discharged from the hospital on the third day after the surgery. Short segment transpedicular fixation on the one level above and one level below of the fractured vertebrate together with balloon kyphoplasty on the corpus of the fractured vertebrate may be used as a minimally invasive surgical treatment in such kind of injuries. The advantages are short duration of hospital stay, less blood loss, providing early mobilization, and a reliable method for fixation and stabilization. In this article, a case with traumatic fracture that fixed and stabilized with short segment transpedicular screw placement and balloon kyphoplasty application was presented.

  16. 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.

  17. MDCT after balloon kyphoplasty: analysis of vertebral body architecture one year after treatment of osteoporotic fractures; MDCT nach Ballonkyphoplastie: Analyse der Wirbelkoerperarchitektur 1 Jahr nach Behandlung osteoporotischer Sinterungsfrakturen

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    Roehrl, B.; Dueber, C. [Klinik und Poliklinik fuer Diagnostische und Interventionelle Radiologie, Universitaetsklinik Mainz (Germany); Sadick, M. [Inst. fuer Radiologie, Universitaetsklinikum Mannheim (Germany); Brocker, K.; Voggenreiter, G.; Obertacke, U. [Zentrum fuer Orthopaedie und Traumatologie, Universitaetsklinikum Mannheim (Germany); Brade, J. [Inst. fuer Medizinische Statistik und Biometrie, Universitaetsklinikum Mannheim (Germany)

    2006-08-15

    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.)

  18. Unilateral versus bilateral balloon kyphoplasty in the treatment of osteoporotic vertebral compression fractures.

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    Chen, Hua; Tang, Peifu; Zhao, Yanpeng; Gao, Yuan; Wang, Yan

    2014-09-01

    Bilateral and unilateral approaches are the main methods for balloon kyphoplasty. However, controversy exists about which leads to superior outcomes. The goal of this study was to compare the clinical effects and safety of unilateral vs bilateral balloon kyphoplasty for osteoporotic vertebral compression fractures. Five databases (PubMed, Cochrane Library, EMBASE, Web of Science, and Chinese Biomedical Database) were searched without language, publication, or date restrictions. Randomized controlled trials involving a total of 876 patients and comparing the efficacy of unilateral vs bilateral balloon kyphoplasty for osteoporotic vertebral compression fractures were identified. Meta-analysis revealed no significant differences in visual analog scale pain score up to 2-year follow-up (mean difference at 1 week, 0.17 [95% confidence interval (CI), -0.11 to 0.44]; mean difference at 1 year, 0.01 [95% CI, -0.29 to 0.32]; mean difference at 2 years, 0.28 [95% CI, -0.13 to 0.70]), Oswestry Disability Index pain score up to 1-year follow-up (mean difference at 1 week, 1.28 [95% CI, -2.62 to 5.17]; mean difference at 1 year, 1.87 (95% CI, -5.33 to 9.06]), anterior and middle vertebral height (mean difference anterior, -0.13 [95% CI, -0.32 to 0.06]; mean difference middle, -0.16 [95% CI, -0.36 to 0.03]), or kyphotic angle (mean difference, -0.02 [95% CI, -0.65 to 0.61]); however, the unilateral approach resulted in a shorter operative time (mean difference, -19.33 [95% CI, -4.42 to -14.24]), smaller amount of cement injected (mean difference, -2.07 [95% CI, -2.42 to -1.71]), and lower risk of cement leakage (mean difference, 0.47 [95% CI, 0.24-0.92]) than the bilateral approach. The unilateral approach resulted in pain relief and vertebral height and kyphotic angle restoration comparable with that of bilateral kyphoplasty. The unilateral approach should be considered an effective option for the treatment of osteoporotic vertebral compression fractures.

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

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    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.

  20. 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

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

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    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.

  2. Balloon kyphoplasty: an experience of 38 patients with painful osteoporotic vertebral compressive fractures

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    ZHANG Qiang; ZOU De-wei; HAI Yong; MA Hua-song; BAI Ke-wen

    2006-01-01

    Objective: To evaluate the efficacy and safety of percutaneous balloon kyphoplasty as a new therapy for patients with painful osteoporotic vertebral compressive fractures of the lumbar and thoracic spine.Methods: A retrospective analysis was conducted in 38 consecutive patients (28 females, 10 males), whose ages ranged from 56 to 82 years (mean age 72 years). The symptom- and sign-positive spinal segment was identified by MRI. The time between onset of symptoms and surgical intervention ranged from 2 days to 1 year. 62 segments (36 thoracic, 26 lumbar) were treated in this cohort. The pain score estimated by Visual Analog Scale and activity degree were assessed immediately after operation and at 1-, 6-,and 12-month postoperative follow-up. Preoperative and postoperative anterior, midline vertebral heights in fractured vertebrae were measured on lateral radiographs to evaluate the effect of the procedure.Results: The method achieved a swift pain relief associated with an evidently increased weight-bearing ability. The pain score was reduced from 8. 2 to 2.4 points.The anterior and midline vertebral heights in 62 fractured vertebral bodies increased up to 82.76% ±26.84%,88.82 % ± 21.75 % and the wedge decreased from 15 to 8 degrees. This effect persisted at least over a period of two years. The procedure did not induce narrowing of the spinal canal and no severe complications occurred.Conclusions: Balloon kyphoplasty can result in immediate clinical improvement of mobility and pain relief,increase vertebral body height, and quickly return patient's activity. The short-term results are approved excellent, and the long-term results need further judgment.

  3. [Clinical cost analysis of balloon kyphoplasty--is there a possibility of cost-covering treatment?].

    Science.gov (United States)

    Chmielnicki, M; McDougall, A M; Prokop, A

    2014-06-01

    Financial pressure on hospitals has been a major issue in the health care system of the past years and the financial situation is often what decides about the future of the hospitals. Therefore today the economic feasibility of patient treatment in hospitals is more important than ever before. After the degradation of the case-based lump sum of I09D to I09F on a one and two level kyphoplasty we took that as motivation to do a cost analysis on 10 randomised cases. The average age of the patients was 75 years (m : f = 2 : 8), the average stay in hospital was 8 days (3-12 d). The analysis was done by a searching of documents in cooperation with the firm GFG-Beratungsgesellschaft mbH (Mönchengladbach, Germany). We found that the average overall cost which includes the cost of hospital stay and the expenditure on material was 7512.53 € and the average earnings of the cases was 7610,97 €, the difference and in that way the proceeds was 98.44 €. On that result performance of a one-level kyphoplasty especially after the degradation of the case-based lump sum in 2013 is possible in a cost-covering way, an increase in profit may be possible by a decrement of hospital stay. In 2014 one- and two-stage kyphoplasty once underwent a reduction of G-DRG from I09F to I09E. At the same time the cost weight of lump compensation I09E was increased by 0.071 with the result that in 2014, with an increased federal base value of 3156.82 € (in 2013 the federal base rate value was 3068.37 €), additional proceeds of 404,92 € can be realised in the field of one- and two-stage kyphoplasty compared to in 2013. On that result a one-level kyphoplasty especially after the degradation of the case-based lump sum in 2013 and in 2014 is possible in a cost-covering manner, an increase in profit may be possible by a decrement of hospital stay.

  4. Balloon kyphoplasty for the treatment of acute vertebral compression fractures: 2-year results from a randomized trial.

    Science.gov (United States)

    Boonen, Steven; Van Meirhaeghe, Jan; Bastian, Leonard; Cummings, Steven R; Ranstam, Jonas; Tillman, John B; Eastell, Richard; Talmadge, Karen; Wardlaw, Douglas

    2011-07-01

    Vertebral fractures are often painful and lead to reduced quality of life and disability. We compared the efficacy and safety of balloon kyphoplasty to nonsurgical therapy over 24 months in patients with acute painful fractures. Adults with one to three vertebral fractures were randomized within 3 months from onset of pain to undergo kyphoplasty (n = 149) or nonsurgical therapy (n = 151). Quality of life, function, disability, and pain were assessed over 24 months. Kyphoplasty was associated with greater improvements in Short-Form 36 (SF-36) Physical Component Summary (PCS) scores when averaged across the 24-month follow-up period compared with nonsurgical therapy [overall treatment effect 3.24 points, 95% confidence interval (CI) 1.47-5.01, p = .0004]; the treatment difference remained statistically significant at 6 months (3.39 points, 95% CI 1.13-5.64, p = .003) but not at 12 months (1.70 points, 95% CI -0.59 to 3.98, p = .15) or 24 months (1.68 points, 95% CI -0.63 to 3.99, p = .15). Greater improvement in back pain was observed over 24 months for kyphoplasty (overall treatment effect -1.49 points, 95% CI -1.88 to -1.10, p kyphoplasty, 44.1% for control) with new radiographic vertebral fractures; fewer fractures occurred (~18%) within the second year. Compared with nonsurgical management, kyphoplasty rapidly reduces pain and improves function, disability, and quality of life without increasing the risk of additional vertebral fractures. The differences from nonsurgical management are statistically significant when averaged across 24 months. Most outcomes are not statistically different at 24 months, but the reduction in back pain remains statistically significant at all time points.

  5. Odontoid balloon kyphoplasty associated with screw fixation for Type II fracture in 2 elderly patients.

    Science.gov (United States)

    Terreaux, Luc; Loubersac, Thomas; Hamel, Olivier; Bord, Eric; Robert, Roger; Buffenoir, Kevin

    2015-03-01

    Anterior screw fixation is a well-recognized technique that is used to stabilize Type IIB fractures of the odontoid process in the elderly. However, advanced age and osteoporosis are 2 risk factors for pseudarthrosis. Kyphoplasty has been described in the treatment of lytic lesions in C-2. The authors decided to combine these 2 techniques in the treatment of unstable fractures of the odontoid. Two approximately 90-year-old patients were treated for this type of fracture. Instability was demonstrated on dynamic radiography in one patient, and the fracture was seen on static radiography in the other. Clinical parameters, pain, range of motion, 36-Item Short Form Health Survey (SF-36) score (for the first patient), and radiological examinations (CT scans and dynamic radiographs) were studied both before and after surgery. After inflating the balloon both above and below the fracture line, the authors applied a high-viscosity polymethylmethacrylate cement. Some minor leakage of cement was noted in both cases but proved to be harmless. The screws were correctly positioned. The clinical result was excellent, both in terms of pain relief and in the fact that there was no reduction in the SF-36 score. The range of motion remained the same. A follow-up CT scan obtained 1 year later in one of the patients showed no evidence of change in the materials used, and the dynamic radiographs showed no instability. This combination of kyphoplasty and anterior screw fixation of the odontoid seems to be an interesting technique in osteoporotic Type IIB fractures of the odontoid process in the elderly, with good results both clinically and radiologically.

  6. Compression fracture in the middle of a chronic instrumented fusion that developed into pseudarthrosis after balloon kyphoplasty.

    Science.gov (United States)

    Pirris, Stephen M; Kimes, Sherri M

    2014-06-01

    There are only 2 documented cases of vertebral compression fractures occurring within a solid lumbar fusion mass: one within the fusion mass after hardware removal and the other within the levels of the existing instrumentation 1 year postoperatively. The authors report a case of fracture occurring in a chronic (> 30 years) solid instrumented fusion mass in a patient who underwent kyphoplasty. The pain did not improve after the kyphoplasty procedure, and the patient developed a posterior cleft in the fusion mass postoperatively. The patient, a 46-year-old woman, had undergone a T4-L4 instrumented fusion with placement of a Harrington rod when she was 12 years old. Adjacent-segment breakdown developed, and her fusion was extended to the pelvis, with pedicle screws placed up to L-3 to capture the existing fusion mass. Almost 2 years after fusion extension, she fell down the stairs and suffered an L-2 compression fracture, which is when kyphoplasty was performed without pain relief, and she then developed a cleft in the posterior fusion mass that was previously intact. She refused further surgical options. This case report is meant to alert surgeons of this possibility and allow them to consider the rare occurrence of fracture within the fusion mass when planning extension of chronic spinal fusions.

  7. 球囊扩张椎体后凸成形术30例围术期护理%Perioperative nursing care of 30 patients with balloon kyphoplasty

    Institute of Scientific and Technical Information of China (English)

    彭红

    2011-01-01

    目的:探讨球囊扩张椎体后凸成形术(PKP)治疗骨质疏松椎体压缩性骨折(VCF)的围术期护理方法.方法:对30例56岁以上VCF患者行PKP治疗,术前给予针对性心理护理、体位训练、肺功能训练及肠道准备,术中密切配合,术后做好体位护理、加强并发症观察与护理、指导患者进行早期康复锻炼.结果:本组患者均手术成功,住院期间未发生严重并发症.结论:围术期精心护理是VCF患者行PKP治疗成功的重要保障.%Objective:To explore the perioperative nursing methods in the treatment of osteoporotic vertebral compression fractures ( VCF) by balloon kyphoplasty.Methods: 30 VCF patients over 56 years old were treated with balloon kyphoplasty.The comprehensive perioperative nursing care was carried out, such as preoperative targeted psychological care, posture training,lung function training, bowel preparation, close intraoperative cooperation, postoperative posture care, strengthening the observation on complications and proper nursing care and guidance on the early rehabilitation exercises.Results: The all operations were successfully performed and No serious complications occurred in the patients during hospitalization.Conclusion: The careful perioperative nursing care is an important guarantee for the successful treatment of osteoporotic vertebral compression fractures by balloon kyphoplasty.

  8. Radiofrequency-targeted vertebral augmentation versus traditional balloon kyphoplasty: radiographic and morphologic outcomes of an ex vivo biomechanical pilot study

    Directory of Open Access Journals (Sweden)

    Dalton BE

    2012-11-01

    Full Text Available Brian E Dalton,1 Andrew C Kohm,2 Larry E Miller,3,4 Jon E Block,4 Robert D Poser21Tri-State Neurological Surgeons, Erie, PA, 2DFINE, Inc, San Jose, CA, 3Miller Scientific Consulting, Inc, Arden, NC, 4The Jon Block Group, San Francisco, CA, USAPurpose: Traditional balloon kyphoplasty (BK is a common treatment for symptomatic vertebral compression fractures. The purpose of this study was to compare a novel vertebral augmentation technique, radiofrequency-targeted vertebral augmentation (RF-TVA, to BK for restoration of vertebral height, cavity creation, and polymethylmethacrylate (PMMA delivery and interdigitation into the surrounding trabeculae.Methods: This ex vivo biomechanical pilot study utilized 16 osteoporotic cadaveric vertebral bodies in a standardized fracture model to compare unipedicular RF-TVA (n = 8 to bipedicular BK (n = 8. Four specimens from each group were tested in loaded and unloaded conditions. All specimens were imaged, assessed for height restoration, and sectioned to observe PMMA distribution. A subset of specimens underwent computed tomography scanning to assess cavity creation and trabecular architecture prior to cement delivery.Results: Anterior height restoration was greater with RF-TVA (median: 84%, interquartile range: 62%–95% compared to BK (median: 69%, interquartile range: 60%–81%, although the difference did not achieve statistical significance (P = 0.16. Anterior height restoration was numerically greater under loaded (median: 70% versus 66% and unloaded (median: 94% versus 77% conditions with RF-TVA versus BK. RF-TVA produced more discrete cavities and less native trabecular destruction compared to marked trabecular destruction observed with BK. RF-TVA consistently showed a well-identified focal area of PMMA with an extensive peripheral zone of PMMA interdigitation, providing mechanical interlock into the adjacent intact trabecular matrix. In contrast, BK yielded little evidence of PMMA interdigitation

  9. The Reverse Thomas Position for Thoracolumbar Fracture Height Restoration: Relative Contribution of Patient Positioning in Percutaneous Balloon Kyphoplasty for Acute Vertebral Compressions

    Science.gov (United States)

    Cawley, Derek T.; Beecher, Suzanne M.; Baker, Joseph F.; McCabe, John P.

    2016-01-01

    Background Standard positioning for percutaneous balloon kyphoplasty requires placing a patient prone with supports under the iliac crests and upper thorax. The authors believe that hip hyperextension maximises pelvic anteversion creating anterior longitudinal ligamentotaxis, thus facilitating restoration of vertebral height. Methods Radiographic imaging including pre-operative, post-positioning, post balloon tamp inflation and post-operative lateral radiographs were analysed for anterior and posterior column height, wedge angle of the affected vertebra and 3-level Cobb angle in patients with recent fractures of T11-L1. Fracture dimensions of the index vertebra were expressed as percentage of the analogous dimension of the referent vertebra. Results From a total of 149 patients, a full imaging sequence was available on 21 cases of vertebral compression fractures. The described positioning technique created a mean anterior column height increase from 68.3% to 75.3% with positioning (p = 0.15), increasing to 82.3% post balloon inflation. Average Cobb and wedge angle improvement of 4.7° (p = 0.004)and 3.6° (p = 0.002) from positioning along were also recorded. Conclusion The Reverse Thomas Position is a safe and effective technique for augmenting thoracolumbar fracture height restoration in percutaneous balloon kyphoplasty. PMID:27441179

  10. Which is best for osteoporotic vertebral compression fractures: balloon kyphoplasty, percutaneous vertebroplasty or non-surgical treatment? A study protocol for a Bayesian network meta-analysis

    Science.gov (United States)

    Kan, Shun-Li; Yuan, Zhi-Fang; Chen, Ling-Xiao; Sun, Jing-Cheng; Ning, Guang-Zhi; Feng, Shi-Qing

    2017-01-01

    Introduction Osteoporotic vertebral compression fractures (OVCFs) commonly cause both acute and chronic back pain, substantial spinal deformity, functional disability and decreased quality of life and increase the risk of future vertebral fractures and mortality. Percutaneous vertebroplasty (PVP), balloon kyphoplasty (BK) and non-surgical treatment (NST) are mostly used for the treatment of OVCFs. However, which treatment is preferred is unknown. The purpose of this study is to comprehensively review the literature and ascertain the relative efficacy and safety of BK, PVP and NST for patients with OVCFs using a Bayesian network meta-analysis. Methods and analysis We will comprehensively search PubMed, EMBASE and the Cochrane Central Register of Controlled Trials, to include randomided controlled trials that compare BK, PVP or NST for treating OVCFs. The risk of bias for individual studies will be assessed according to the Cochrane Handbook. Bayesian network meta-analysis will be performed to compare the efficacy and safety of BK, PVP and NST. The quality of evidence will be evaluated by GRADE. Ethics and dissemination Ethical approval and patient consent are not required since this study is a meta-analysis based on published studies. The results of this network meta-analysis will be submitted to a peer-reviewed journal for publication. PROSPERO registration number CRD42016039452; Pre-results. PMID:28093431

  11. Effect of postural reduction and balloon dilation on correction of vertebral height by percutaneous balloon kyphoplasty%体位复位与球囊扩张对椎体后凸成形术的复位效果

    Institute of Scientific and Technical Information of China (English)

    章恺; 王鸥; 荚龙; 程黎明

    2015-01-01

    Objective To explore the effect of postural reduction and balloon dilation on the correction of vertebral height following balloon percutaneous kyphoplasty (PKP) for osteoporotic vertebral coinpressive fracture (OVCF).Methods From June 2012 to December 2013,47 OVCF patients involving 57 fractured thoracolumbar vertebrae with intact posterior wall underwent PKP.In all patients postural reduction was performed under general anesthesia.The percentages of vertebral height loss before and after balloon dilation were compared.The curative effects were evaluated by comparing preoperative and postoperative visual analogue scale(VAS) scores and cobb angles.Results Compared with preoperation,the vertebral heights of anterior and middle columns were significantly improved after postural reduction,balloon dilation and PKP (P < 0.05),but there was no significant improvement before and after balloon dilation (P >0.05).The postoperative average cobb angle (22.8°± 8.1°) was significantly decreased compared with the preoperative one (22.8° ± 8.1°) (P < 0.05).The VAS scores at preoperation,one day postoperation and the final follow-up were respectively 8.5 ± 0.4,3.4 ± 0.2 and 3.1 ± 0.3.The postoperative ones were significantly lower than the preoperative one (F =7.518,P =0.006).Conclusions In PKP,postural reduction under general anesthesia plays an important role,but balloon dilation may exert an insignificant effect on restoration of vertebral height.%目的 探讨体位复位与球囊扩张对经皮椎体后凸成形术(PKP)治疗骨质疏松性椎体压缩骨折(OVCF)术中复位效果.方法 2012年6月至2013年12月采用PKP治疗后壁完整的胸腰椎OVCF 47例患者(57个椎体),所有患者都在全身麻醉下先行体位复位,比较手术中球囊扩张前、后伤椎前缘、中部高度丢失百分比、疼痛视觉模拟评分(VAS)及cobb角. 结果 本组患者椎体前缘、中部高度在体位复位前、球囊扩展后、术后均较术前改

  12. Kyphoplasty: Chances and limits

    Directory of Open Access Journals (Sweden)

    Mueller Christian

    2005-01-01

    Full Text Available Kyphoplasty provides a minimal-invasive surgical technique for the cement augmentation of vertebral bodies following osteoprotic compression fractures or malignant processes. Kyphoplasty has been developed as an advancement of vertebroplasty. Both procedures feature high-success rates in terms of reliable and lasting reduction of pain. Advantages of kyphoplasty over vertebroplasty are to be seen in the possibility of deformity correction as well as in a decreased risk of cement leakage, which represents the most important source for clinical complications. Long-term experiences with the effect of cementing vertebral bodies are sparse. Thus indications and possibilities have to be judged realistically. Conditions, which have to be considered before performing kyphoplasty or vertebroplasty include age of the patient, age of the fracture, degree of deformation and additional degenerative changes of the spine. This article summarizes the present research and literature as well as indications and contraindications and is thought to provide guidelines for the aforementioned decision-making processes.

  13. The impact of endplate fracture on postoperative vertebral height loss and kyphotic deformity during treatment of osteoporotic vertebral compression fractures with balloon kyphoplasty

    Science.gov (United States)

    Li, Qingqing; Xiao, Long; Zhang, Jianwei; Fan, Jin; Zhou, Wei; Yin, Guoyong; Ren, Yongxin

    2016-01-01

    Abstract This retrospective study investigated the impact of endplate fracture on postoperative vertebral height loss and kyphotic deformity in 144 patients with osteoporotic vertebral compression fracture (OVCF), who received balloon kyphoplasty. Patients were divided into four groups: Group 1 had no superior endplate fracture, Group 2 had fractures on the anterior portion of the superior endplate, Group 3 had fractures on the posterior portion of the superior endplate, and Group 4 had complete superior endplate fractures. Anterior and middle vertebral body height, vertebral compression ratio, vertebral height loss rate, and kyphosis Cobb angle of each patient were measured and visual analogue scale (VAS) and Oswestry disability index (ODI) scores were recorded. The anterior vertebral height and kyphosis deformity of all groups significantly improved after the surgery, whereas substantial anterior vertebral height loss and increased Cobb angle were observed in all patients at the last follow-up. Although the vertebral height loss rate and the Cobb angle in Group 2, 3 and 4 were larger compared with Group 1 at the last follow-up, only the vertebral height loss rate in Group 4 and the increase in the Cobb angle in Group 2 and 4 were statistically different from those in Group 1. The VAS and ODI scores in all groups measured after the surgery and at the last follow-up were significantly lower compared with preoperative scores, but there was no significant difference among these groups. Balloon kyphoplasty significantly improved vertebral fracture height and kyphosis. Vertebral height loss and increased kyphotic deformity were observed in OVCF patients with endplate fractures after the surgery. Postoperative aggravation of kyphosis was observed in Group 2. Furthermore, severe vertebral height loss and increased kyphotic deformity were confirmed in Group 4 after the surgery. Our results suggested that postoperative vertebral height loss and aggravation of kyphosis may

  14. Uniextrapedicular kyphoplasty for the treatment of thoracic osteoporotic vertebral fractures.

    Science.gov (United States)

    Ge, Zhaohui; Ma, Rong; Chen, Zhen; Zhang, Huiyong; Ding, Huiqiang; Liang, Siming; Suo, Zhigang

    2013-08-01

    Osteoporotic vertebral compression fractures are common and cause pain and disability. Most osteoporotic vertebral compression fractures occur in the lower thoracic and thoracolumbar spine. Percutaneous balloon kyphoplasty through a transpedicular approach is a classic procedure performed to treat osteoporotic vertebral compression fractures. However, due to the slender morphology of the pedicles, small pedicle size, and the angular severity of thoracic kyphosis, performing kyphoplasty in middle and high thoracic levels is technically challenging. The purpose of this retrospective study was to evaluate the clinical outcomes of single-balloon kyphoplasty for the treatment of thoracic osteoporotic vertebral compression fractures via an extrapedicular approach. Between July 2004 and May 2008, thirty-eight patients with thoracic osteoporotic vertebral compression fractures underwent percutaneous kyphoplasty via a unilateral extrapedicular approach. Average patient age was 60.3 years. Symptomatic levels ranged from T4 to T12. All affected vertebrae were identified via physical examination, magnetic resonance imaging, and radiographs. Pain relief, vertebral height restoration, and kyphosis correction were compared pre- and postoperatively using the visual analog scale and radiographs. The operation was successful in all patients. Average injected bone cement volume was 3.2±1.4 mL. Mean follow-up was 9.5 months. Visual analog scale pain score improved in 36 of 38 patients postoperatively. Mean visual analog scale pain score was 8.92±0.682 preoperatively and 2.40±0.31 postoperatively and remained at 2.80±0.34 until last follow-up. Mean middle body height correction ratio was 50.9%±34.6%. No lateral wedging was found in the coronal alignment of the treated vertebrae. Three (7.9%) patients sustained cement extravasation with no adverse events. Kyphoplasty through a unilateral extrapedicular approach can achieve convergent and proper cement filling in the affected

  15. Kyphoplasty in osteoporotic vertebral compression fractures - Guidelines and technical considerations

    Directory of Open Access Journals (Sweden)

    Försth Peter

    2011-08-01

    Full Text Available Abstract Osteoporotic vertebral compression fractures are a menace to the elderly generation causing diminished quality of life due to pain and deformity. At first, conservative treatment still is the method of choice. In case of resulting deformity, sintering and persistent pain vertebral cement augmentation techniques today are widely used. Open correction of resulting deformity by different types of osteotomies addresses sagittal balance, but has comparably high morbidity. Besides conventional vertebral cement augmentation techniques balloon kyphoplasty has become a popular tool to address painful thoracic and lumbar compression fractures. It showed improved pain reduction and lower complication rates compared to standard vertebroplasty. Interestingly the results of two placebo-controlled vertebroplasty studies question the value of cement augmentation, if compared to a sham operation. Even though there exists now favourable data for kyphoplasty from one randomised controlled trial, the absence of a sham group leaves the placebo effect unaddressed. Technically kyphoplasty can be performed with a transpedicular or extrapedicular access. Polymethyl methacrylate (PMMA-cement should be favoured, since calcium phosphate cement showed inferior biomechanical properties and less effect on pain reduction especially in less stable burst fractures. Common complications of kyphoplasty are cement leakage and adjacent segment fractures. Rare complications are toxic PMMA-monomer reactions, cement embolisation, and infection.

  16. Influence of loading cycle profile and frequency on a biomechanical parameter of a model of a balloon kyphoplasty-augmented lumbar spine segment: a finite element analysis study.

    Science.gov (United States)

    Li, Yuan; Lewis, Gladius

    2010-01-01

    For patients who are suffering debilitating and persistent pain due to vertebral compression fracture(s) and for whom conservative therapies have not provided relief, balloon kyphoplasty (BKP) is used as a surgical option. There are only a very few literature reports on the use of the finite element analysis (FEA) method to obtain biomechanical parameters of models of spine segments that include BKP augmentation at a given level. In each of these studies, the applied loading used was quasi-static. During normal activities of daily living, the patient's spine would be subject to dynamically-applied loading. Thus, the question of the influence of the characteristics of a dynamically-applied loading cycle on biomechanical parameters of a spine that includes BKP-augmented segment(s) is germane; however, a study of this issue is lacking. We investigated this issue in the present FEA work, with the spine segment model being the L1-L3 motion segment units (MSUs) (a segment that is commonly augmented using BKP) and prophylactic BKP simulated at L2. The dynamic load was the compressive load-versus-time cycle to which the L3-L4 MSU is subjected during gait. Four cases of the cycle were considered, corresponding to slow-, normal-, fast- and very fast-paced gait. The loading cycle was applied to the superior surface of L1 while the inferior surface of L3 was fully constrained. It was found that (1) the global mean von Mises stress during the loading cycle (σVMG), in each tissue in the model increased in going from a slow-paced gait cycle to a very fast-paced gait cycle; and (2) for the slow-paced gait cycle, with increase in frequency of the cycle, f (1 ≤ f ≤ 3 Hz), σVMG in each of these tissues increased. Potential uses of the present findings are identified.

  17. Refracture of osteoporotic vertebral body concurrent with cement fragmentation at the previously treated vertebral level after balloon kyphoplasty: a case report.

    Science.gov (United States)

    Li, Xigong; Lou, Xianfeng; Lin, Xiangjin; Du, Junhua

    2014-05-01

    Kyphoplasty has been shown to provide symptomatic relief of vertebral compression fractures refractory to medical therapy. However, few reports have focused on refracture of cemented vertebrae after kyphoplasty. The presence of cemented vertebrae refracture concurrent with cement fragmentation is an extremely rare condition. We reported an 86-year-old man with a T12 osteoporotic compression fracture undergoing the kyphoplasty treatment. The patient postoperatively continued to have back pain at the same level. The solid lumped polymethylmethacrylate (PMMA) mass and inadequate use and insufficient filling of PMMA cement were observed in postoperative radiographs and magnetic resonance image (MRI) examination. He refused to receive the surgical intervention, but had not strict compliance with oral anti-osteoporotic medications. Ten months postoperatively, refracture of osteoporotic vertebral body concurrent with cement fragmentation occurred at the previously kyphoplasty-treated vertebral level. Bone mineral analysis showed severe osteoporosis with a T-score of -4.0. The patient finally obtained therapeutic benefit of pain relief and bony union of T12 vertebral body by consistently adhering to anti-osteoporotic medication treatment. This case illustrated that patients who underwent kyphoplasty to treat osteoporotic vertebral compression fractures with intravertebral fracture should be strictly followed up and supervised in their anti-osteoporotic medication treatment. The interdigitation injection pattern of PMMA and sufficient PMMA filling with trabeculae in the kyphoplasty procedure also might prevent refracture of the cemented vertebrae concurrent with PMMA fragmentation.

  18. Results of kyphoplasty in the minimally invasive treatment of vertebral metastasis

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    Carlos Fernando Pereira da Silva Herrero

    2014-09-01

    Full Text Available OBJECTIVE: To evaluate the clinical and radiological outcome of minimally invasive surgical treatment of vertebral metastases using the technique of kyphoplasty. METHODS: This was a prospective observational study of patients with the diagnosis of spinal metastasis who underwent minimally invasive surgical treatment by filling the vertebral body with balloon kyphoplasty technique. Clinical evaluation included patient age at surgery, diagnosis of the tumor, biopsy results, data of the surgical procedure performed, visual pain scale (VAS and complications related to surgery. Radiological evaluation involved the study of radiographic procedures in the anteroposterior and lateral incidences, with the analysis of vertebral body kyphosis and the occurrence of extravasation of cement. RESULTS: 22 patients with spinal metastases who were treated by balloon kyphoplasty, 8 (36% males and 14 (64% females were studied. The average age was 56.05 years and the mean follow-up was 8.5 months. The mean preoperative VAS was 8.73, 1.73 in the initial postoperative period, and 1.92 in the late postoperative period. CONCLUSION: Kyphoplasty proved to be a safe and effective technique for symptomatic treatment of vertebral metastases.

  19. Epidural cement leakage through pedicle violation after balloon kyphoplasty causing paraparesis in osteoporotic vertebral compression fractures - a report of two cases

    Directory of Open Access Journals (Sweden)

    Noh Won

    2010-08-01

    Full Text Available Abstract Kyphoplasty is advantageous over vertebroplasty in terms of better kyphosis correction and diminished risk of cement extravasations. Literature described cement leakage causing neurological injury mainly after vertebroplasty procedure; only a few case reports show cement leakage with kyphoplasty without neurological injury or proper cause of leakage. We present a report two cases of osteoporotic vertebral compression fracture treated with kyphoplasty and developed cement leakage causing significant neurological injury. In both cases CT scan was the diagnostic tool to identify cause of cement leakage. CT scan exhibited violation of medial pedicle wall causing cement leakage in the spinal canal. Both patients displayed clinical improvement after decompression surgery with or without instrumentation. Retrospectively looking at stored fluoroscopic images, we found that improper position of trocar in AP and lateral view simultaneously while taking entry caused pedicle wall violation. We suggest not to cross medial pedicle wall in AP image throughout the entire procedure and keeping the trocar in the center of pedicle in lateral image would be the most important precaution to prevent such complication. Our case reports adds the neurological complications with kyphoplasty procedure and suggested that along with other precautions described in the literature, entry with trocar along the entire procedure keeping the oval shape of pedicle in mind (under C-arm will probably help to prevent such complications.

  20. Tuberculous Spondylitis Following Kyphoplasty

    Science.gov (United States)

    Ge, Chao-Yuan; He, Li-Ming; Zheng, Yong-Hong; Liu, Tuan-Jiang; Guo, Hua; He, Bao-Rong; Qian, Li-Xiong; Zhao, Yuan-Tin; Yang, Jun-Song; Hao, Ding-Jun

    2016-01-01

    Abstract Tuberculous spondylitis of the augmented vertebral column following percutaneous vertebroplasty or kyphoplasty has rarely been described. We report an unusual case of tuberculous spondylitis diagnosed after percutaneous kyphoplasty (PKP). A 61-year-old woman presented to our institution complaining of back pain following a fall 7 days before. Radiologic studies revealed an acute osteoporotic compression L1 fracture. The patient denied history of pulmonary tuberculosis (TB) and there were no signs of infection. The patient was discharged from hospital 4 days after undergoing L1 PKP with a dramatic improvement in her back pain. Two years later, the patient was readmitted with a 1 year history of recurrent back pain. Imaging examinations demonstrated long segmental bony destruction involving L1 vertebra with massive paravertebral abscess formation. The tentative diagnosis of tuberculous spondylitis was made, after a serum T-SPOT. The TB test was found to be positive. Anterior debridement, L1 corpectomy, decompression, and autologous rib graft interposition, and posterior T8-L4 instrumentation were performed. The histologic examination of the resected tissue results confirmed the diagnosis of spinal TB. Anti-TB medications were administered for 12 months and the patient recovered without sequelae. Spinal TB and osteoporotic vertebral compression fractures are similar clinically and radiologically. Spinal surgeons should consider this disease entity to avoid misdiagnosis or complications. Early surgical intervention and anti-TB treatment should be instituted as soon as the diagnosis of spinal TB after vertebral augmentation is made. PMID:26986102

  1. Vertebral augmentation by kyphoplasty and vertebroplasty: 8 years experience outcomes and complications

    Directory of Open Access Journals (Sweden)

    Kaan Yaltirik

    2016-01-01

    Conclusions: Percutaneous vertebroplasty and balloon kyphoplasty are both effective and safe minimally invasive procedures for the stabilization of VCFs. However, complications should be kept in mind during decision making.

  2. Vertebral augmentation by kyphoplasty and vertebroplasty: 8 years experience outcomes and complications

    Science.gov (United States)

    Yaltirik, Kaan; Ashour, Ahmed M; Reis, Conner R; Özdoğan, Selçuk; Atalay, Başar

    2016-01-01

    Background and Context: Minimally invasive percutaneous vertebral augmentation techniques; vertebroplasty, and kyphoplasty have been treatment choices for vertebral compression fractures (VCFs). The purpose of this study is to evaluate the outcomes of the patients who underwent vertebroplasty or kyphoplasty regarding complications, correction of vertebral body height, kyphosis angle and pain relief assessment using visual analog score (VAS) for pain. Materials and Methods: A retrospective review of the hospital records for 100 consecutive patients treated with kyphoplasty or vertebroplasty in our department database. Patients with osteoporotic compression fractures, traumatic compressions, and osteolytic vertebral lesions, including metastases, hemangiomas, and multiple myeloma, were included in the study. Preoperative and postoperative VAS pain scores, percentages of vertebral compression and kyphotic angles were measured and compared as well as demographic characteristics and postoperative complications. Mobilization and length of stay (LOS) were recorded. Results: One hundred patients were treated by 110 procedures. 64 patients were operated on due to osteoporosis (72 procedures). Twelve patients were operated on because of metastasis (13 procedures), 8 patients were operated on because of multiple myeloma (9 procedures). Five patients had two surgeries, 1 patient had 3 surgeries, and 1 patient had 5 surgeries. The mean preoperative VAS was 74.05 ± 9.8. In total, 175 levels were treated, 46 levels by kyphoplasty and 129 by vertebroplasty. The mean postoperative VAS was 20.94 ± 11.8. Most of the patients were mobilized in the same day they of surgery. Mean LOS was 1.83 days. Six patients had nonsymptomatic leakage of polymethlymethacrylate, and patient had epidural hematoma, which was operated on performing hemi-laminectomy. Conclusions: Percutaneous vertebroplasty and balloon kyphoplasty are both effective and safe minimally invasive procedures for the

  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. 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

  5. 球囊椎体后凸成形术与Sky膨胀式椎体成形术治疗椎体压缩性骨折的Meta分析%Treatment effect of balloon kyphoplasty and Sky expander kyphoplasty on vertebral compression fracture: a Meta-analysis

    Institute of Scientific and Technical Information of China (English)

    何蔚; 青祖宏; 高巍; 李永焕; 黄潇楠; 刘明

    2013-01-01

    Objective To evaluate the treatment effect of balloon kyphoplasty (Pkp) and Sky expander kyphoplasty (Sky) on vertebral compression fracture, and provide a theoretical basis for clinical application. Methods The database of Ovid medline, PubMed, Web of science, EMbase and CNKI from Jan. 1995 to Oct. 2012 were retrieved with computer, and relevant journals were manually retrieved, for the collection of the literature of therapeutic studies on treatment of vertebral compression fracture with Pkp and Sky method. The literature collected was then selected according to the inclusion and exclusion criteria, and analyzed by Meta-analysis software RevMan 5.0.25. Results A total of 4 papers were selected based on that criterion, including 146 cases of Pkp group and 83 cases of Sky group. Random effect model analysis showed no significant difference existed between the two groups regarding postoperative anterior height and column height of vertebral body, Cobb angle and pain relieve (SMD=0.50, 95%CI -0.27-1.27; SMD=0.33, 95%CI -0.11-0.77; SMD=0.46, 95%CI -0.74-1.66; SMD=-0.09, 95%CI -0.37-0.18). However, the subgroup analysis showed the effect of Sky was better than that of Pkp on restoring anterior height and column height of vertebral body and Cobb angle. Conclusion No significant difference was found regarding the treatment effect between Pkp and Sky method in the treatment of osteoporotic vertebral compression fracture, but the clinical effect of Sky was better because of fewer complications and lower medical cost.%目的 评价球囊椎体后凸成形术(Pkp)与Sky膨胀式椎体成形术(Sky)治疗椎体压缩性骨折的疗效,为临床应用提供理论依据.方法 通过计算机检索1995年1月-2012年10月Ovid medline、PubMed、Web of science、EMbase数据库及中国知网数据库,并手工检索相关杂志,搜集关于Pkp及Sky治疗椎体压缩性骨折疗效比较的临床随机对照研究文献.按纳入和排除标准筛选文献,采用RevMan 5.0.25

  6. Radiofrequency kyphoplasty - a case report on mulitple osteoporotic sintering of the lumbar spine

    Directory of Open Access Journals (Sweden)

    Schekelmann R

    2011-01-01

    Full Text Available At St. Marien Hospital, 176 patients with osteoporotic vertebral fractures were treated with balloon kyphoplasty (BKP from January 2007 to September 2009. The functional outcome was good and no relevant complications were encountered. Since September 2009, a further 41 patients with the same indication have been treated with the new procedure of radiofrequency (RF kyphoplasty (DFine. Operating times were markedly shorter and the extravasation of cement was reduced by two thirds. We encountered no complications or circulatory problems. The new procedure (RF kyphoplasty resulted in equally good functional results as did BKP, required less time in the operating room, and reduced the number of negative side effects.

  7. 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...

  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. Radiofrequency Kyphoplasty for the Treatment of Osteoporotic and Neoplastic Vertebral Body Fractures - Preliminary Experience and Clinical Results after 6 Months

    Directory of Open Access Journals (Sweden)

    Elgeti F

    2011-01-01

    Full Text Available Vertebroplasty and conventional kyphoplasty using a balloon or a stent are established methods for the treatment of painful osteoporotic or neoplastic vertebral compression fractures that are resistant to conservative medical treatment. Radiofrequency (RF kyphoplasty with ultra-high viscosity cement is an innovative method. It permits safe and effective treatment of painful osteoporotic and neoplastic vertebral compression fractures while preserving non-compromised cancellous bone.

  10. Clinical evaluation of Crosstrees pod kyphoplasty in the treatment of osteoporotic vertebral compression fractures.

    Science.gov (United States)

    Zhou, Jianwei; Zhang, Zheng; Huasong, Ma; Tan, Rong; Zou, Dewei

    2013-08-01

    Although percutaneous vertebroplasty and balloon kyphoplasty have improved the management of osteoporotic vertebral compression fractures (OVCFs), these techniques still suffer from inherent disadvantages and complications, such as cement leakage. This prospective pilot study evaluated the clinical outcomes of 15 OVCF patients treated with a new technique, the Crosstrees pod kyphoplasty (C-pod kyphoplasty). This is in fact a balloon kyphoplasty, where the balloon is filled with cement, then opened and removed. The VAS for back pain decreased significantly from 8.9 +/- 1.4 preoperatively to 2.1 +/- 13 at 24hrs postoperatively, and to 2.2 +/-1.5 at final followup (p = 0.001). Likewise, the ODI score decreased significantly from 86.1 +/- 8.7 preoperatively to 30.5+/-7.5 at 24 h, and to 32.8 +/- 8.3 at final follow up (p = 0.001). The average vertebral height increased significantly from 14.50 1.34 mm preoperatively to 23.20 1.12 mm 24 h postoperatively and to 22.82 +/- 0.85 mm at final follow-up (p = 0.002). The kyphotic angle decreased significantly from preoperatively (28.50 +/-1.85 degrees) to 24 h postoperatively (11.30 +/-1.40 degrees) and to final follow-up (12.48 +/- 0.70 degrees) (p = 0.005). Cement leakage, infection, pulmonary embolism or nerve injury were not seen. The C-pod kyphoplasty may be an effective minimally invasive procedure to treat OVCFs, with a decreased complication rate compared with vertebroplasty and balloon kyphoplasty.

  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. CT evaluation of local leakage of bone cement after percutaneous kyphoplasty and vertebroplasty

    Energy Technology Data Exchange (ETDEWEB)

    Lee, In Jae; Choi, A. Lam; Yie, Mi-Yeon; Yoon, Ji Young; Jeon, Eui Yong; Koh, Sung Hye; Yoon, Dae Young; Lim, Kyung Ja (Dept. of Radiology, Hallym Univ. Sacred Heart Hospital, Seoul (Korea)), e-mail: ijlee2003@medimail.co.kr; Im, Hyoung June (Dept. of Occupational Medicine, Hallym Univ. College of Medicine, Seoul (Korea))

    2010-07-15

    Background: Percutaneous injection of bone cement (acrylic cement) during percutaneous kyphoplasty and vertebroplasty can cause symptomatic or asymptomatic complications due to leakage, extravasation or vascular migration of cement. Purpose: To investigate and to compare the incidence and site of local leakage or complications of bone cement after percutaneous kyphoplasty and vertebroplasty using bone cement. Material and Methods: We retrospectively reviewed 473 cases of percutaneous kyphoplasty or vertebroplasty performed under fluoroscopic guidance. Of the 473 cases, follow-up CT scans that covered the treated bones were available for 83 cases (59 kyphoplasty and 24 vertebroplasty). Results: The rate of local leakage of bone cement was 87.5% (21/24) for percutaneous vertebroplasty and 49.2% (29/59) for kyphoplasty. The most common site of local leakage was perivertebral soft tissue (n=8, 38.1%) for vertebroplasty. The most common site of local leakage was a perivertebral vein (n=7, 24.1%) for kyphoplasty. Two cases of pulmonary cement embolism developed: one case after kyphoplasty and one case after vertebroplasty. Conclusion: Local leakage of bone cement was more common for percutaneous vertebroplasty compared with kyphoplasty (P<0.005). The most common sites of local leakage were perivertebral soft tissue and perivertebral vein.

  13. 经皮球囊扩张椎体后凸成形术治疗35例老年陈旧腰椎压缩骨折的临床研究%Percutaneous balloon kyphoplasty for treatment of 35 cases of senile vertebral compression fractures

    Institute of Scientific and Technical Information of China (English)

    郭强

    2012-01-01

    目的 探讨经皮球囊扩张椎体后凸成形术治疗老年陈旧腰椎压缩骨折的临床疗效.方法 对35例老年陈旧腰椎压缩骨折患者行经皮球囊扩张椎体后凸成形术治疗,对比分析患者手术前后的临床表现,其中疼痛缓解程度采用视觉模拟疼痛评分法(VAS)评定,椎体高度恢复程度通过X线检查测定.结果 患者术前VAS评分(8.56±0.73)分,术后VAS评分(2.57±0.48)分,术后患者疼痛得到明显改善,手术前后VAS评分差异有统计学意义(P<0.05);患者术前前壁高度(19.45±0.71) mm,中间高度(21.76±0.51) mm,后壁高度(27.33±0.27) mm;患者术后前壁高度(26.38±0.43) mm,中间高度(27.35±0.32) mm,后壁高度(27.42±0.23) mm;患者末后前壁高度以及中间高度恢复明显,与术前差异有统计学意义(P< 0.01);后壁高度较术前有所恢复,但与术前差异无统计学意义(P>0.05).结论 经皮球囊扩张椎体后凸成形术治疗老年陈旧腰椎压缩骨折手术时间短,创伤小,止痛效果好,安全有效,值得推广.%OBJECTIVE To evaluate percutaneous balloon kyphoplasty in treatment of senile old lumbar vertebral compression fractures. METHODS 35 cases of senile old lumbar compression fracture treated with percutaneous balloon kyphoplasty treatment. Contrast analysis was conducted before and after operation to investigate clinical manifestations in patients, including e-valuation on pain using visual analog pain score (VAS) , vertebral height restoration by X ray measurement. RESULTS The preoperative VAS score of patients (8.56 ± 0.73), postoperative VAS score (2.57 ± 0.48), postoperative pain of the patients were improved significantly, VAS before and after operation were significantly different, with statistical significance (P 0.05). CONCLUSION Percutaneous balloon kyphoplasty in treatment of senile old compression fracture of lumbar vertebra has shorted operation time, less trauma, good analgesic effect, and is safe and

  14. Impact of intra-aortic balloon counterpulsation with different balloon volumes on cardiac performance in humans.

    Science.gov (United States)

    Cohen, Marc; Fasseas, Panayotis; Singh, Varinder P; McBride, Ruth; Orford, James L; Kussmaul, William G

    2002-10-01

    Intra-aortic balloon (IAB) counterpulsation can augment the cardiac output. However, the effect of different IAB volumes on cardiac performance has not been adequately evaluated in humans. Eighty-two patients (52 males [63%]; mean age, 65 +/- 12 years; mean body surface area [BSA], 1.8 +/- 0.2 m(2)) had IAB counterpulsation for cardiogenic shock, refractory angina, and preoperatively for high-risk cardiac surgery. Cardiac hemodynamics were prospectively studied during IAB with inflation volumes of 32 vs. 40 cc. Hemodynamic data collected included aortic pressure, pulmonary artery pressure, systemic and mixed venous oxygen saturations, and cardiac output (by Fick). Transthoracic echocardiography (TTE) was used to obtain both velocity time integrals (VTIs) and the area of the left ventricular outflow tract (LVOT). Left ventricular stroke volume was then calculated as LVOT area x VTI. Cardiac output (CO) determined by the Fick method and VTI did not differ significantly (P = NS) between the two inflation volumes (y = 0.002 + 0.97x). In a subgroup of 33 patients with BSA

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

    Directory of Open Access Journals (Sweden)

    Jin Luo

    2010-01-01

    Full Text Available 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.

  16. 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

  17. LISA: a java API for performing simulations of trajectories for all types of balloons

    Science.gov (United States)

    Conessa, Huguette

    2016-07-01

    LISA (LIbrarie de Simulation pour les Aerostats) is a java API for performing simulations of trajectories for all types of balloons (Zero Pressure Balloons, Pressurized Balloons, Infrared Montgolfier), and for all phases of flight (ascent, ceiling, descent). This library has for goals to establish a reliable repository of Balloons flight physics models, to capitalize developments and control models used in different tools. It is already used for flight physics study software in CNES, to understand and reproduce the behavior of balloons, observed during real flights. It will be used operationally for the ground segment of the STRATEOLE2 mission. It was developed with quality rules of "critical software." It is based on fundamental generic concepts, linking the simulation state variables to interchangeable calculation models. Each LISA model defines how to calculate a consistent set of state variables combining validity checks. To perform a simulation for a type of balloon and a phase of flight, it is necessary to select or create a macro-model that is to say, a consistent set of models to choose from among those offered by LISA, defining the behavior of the environment and the balloon. The purpose of this presentation is to introduce the main concepts of LISA, and the new perspectives offered by this library.

  18. Radiofrequency kyphoplasty: a new method for the treatment of osteoporotic vertebral body compression fractures - a case report

    Directory of Open Access Journals (Sweden)

    Licht AW

    2011-01-01

    Full Text Available From January 2005 to December 2008, a total of 148 patients with 205 vertebral fractures were treated with the balloon kyphoplasty system of Medtronic Company at the Asklepios Südpfalzkliniken in Kandel. The outcome of the procedure was favourable. During this period, cement leakages were observed in 27 % of cases, and a pulmonary embolism requiring intervention occurred in one case. Since February 2009, 21 patients with 26 vertebral fractures have been manutreated by the new radiofrequency kyphoplasty procedure of DFine Company. Very good clinical results have been obtained with this method.

  19. 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.

  20. A novel technique of unilateral percutaneous kyphoplasty achieves effective biomechanical strength and reduces radiation exposure

    Science.gov (United States)

    Zhuang, Yan; Yang, Lei; Li, Haijun; Ren, Yajun; Cao, Xiaojian

    2016-01-01

    Purpose: To develop a novel technique of percutaneous kyphoplasty (PKP) with effective biomechanical strength and lower radiation exposure. Methods: Thirty fresh lumbar vertebrae isolated from six hogs were decalcified and compressed to induce osteoporotic vertebral compression fractures. Kyphoplasty was performed using three different techniques (ten for each group): conventional unilateral approach (group A), conventional bilateral approach (group B) and novel unilateral approach (group C). Biomechanical indexes including Yield load and stiffness were tested before and after kyphoplasty. The anterior height of each vertebral body (AHVB) was measured before compression, after compression and after kyphoplasty. Frequency of C-arm use and volume of bone cement were also recorded in the process. Results: Compared with group A, our novel technique in group C can significantly improve the recovery of AHVB after compression fractures. However, there was no statistical difference between group B and group C. Values of Yield load in both group B and group C were statistically higher than that in group A, however, no significant difference was found between group B and C. Statistical results of stiffness were similar to Yield load. Regarding volume of bone cement and radiation exposure, the novel technique in group C needed more bone cement and fluoroscopy use than in group A but less than in group B. Conclusions: This novel device makes unilateral kyphoplasty feasible, safe and effective. In the premise of guaranteed biomechanical strength, the new technique significantly reduces risk of radiation exposure in kyphoplasty. PMID:27158403

  1. Vertebroplasty and kyphoplasty in osteoporotic fractures of vertebral bodies - a prospective 1-year follow-up analysis; Vertebroplastie und Kyphoplastie bei osteoporotischen Wirbelkoerperfrakturen - Eine prospektive Analyse der Einjahresergebnisse

    Energy Technology Data Exchange (ETDEWEB)

    Pflugmacher, R.; Kandziora, F.; Schroeder, R.; Schleicher, P.; Scholz, M.; Schnake, K.; Haas, N.; Khodadadyan-Klostermann, C. [Charite - Centrum fuer Muskuloskeletale Chirurgie, Berlin (Germany)

    2005-12-15

    Purpose: Kyphoplasty and vertebroplasty offer two minimally invasive operative stabilization procedures for vertebral compression fractures. The purpose of this prospective study was to investigate whether both procedures are able to reduce pain and to preserve postoperative vertebral height during a 1-year follow up. Materials and methods: Osteoporotic vertebral fractures were treated in 42 cases, 20 patients (15 female, 5 male) underwent vertebroplasty, 22 patients (14 female, 8 male) underwent kyphoplasty. 32 vertebral fractures were treated with vertebroplasty and 35 vertebral fractures were treated with kyphoplasty. Symptomatic levels were identified by correlating the clinical presentation with conventional radiographs, CT or/and MRI. During the follow up reduction of pain was determined. Radiographic scans were performed pre- and postoperatively and after 3, 6 and 12 months. The vertebral height and endplate angles were measured to assess the restoration of the sagittal alignment. The effects on pain symptoms were measured on a self-reported Visual Analog Scale (VAS) and the Oswestry score was documented. Results: The median pain scores (VAS) decreased significantly for kyphoplasty and vertebroplasty from pre- to post-treatment, as did the Oswestry score (p<0.05). No significant differences could be found between both groups for the median pain score (VAS) and the Oswestry score. Kyphoplasty led to a significant restoration of the vertebral height and reduction of kyphosis (p<0.05). During the 1-year follow up operation techniques were able to stabilize the height of the vertebral body. Conclusion: Kyphoplasty and vertebroplasty are effective minimally invasive procedures for the stabilization of osteoporotic vertebral fractures leading to a statistically significant reduction in pain. Kyphoplasty restores significantly vertebral body height in fresh fractures. The restoration of vertebral height and reduction of kyphosis may have an influence on the long

  2. CONTROVERSIES ON VERTEBROPLASTY AND KYPHOPLASTY FOR VERTEBRAL COMPRESSION FRACTURES

    Directory of Open Access Journals (Sweden)

    Alisson Roberto Teles

    2015-12-01

    Full Text Available Vertebroplasty and kyphoplasty are widely used for osteoporotic and cancer-related vertebral compression fractures refractory to medical treatment. Many aspects of these procedures have been extensively discussed in the literature during the last few years. In this article, we perform a critical appraisal of current evidence on effectiveness and ongoing controversies regarding surgical technique, indications and contraindications, clinical outcomes and potential complications of these procedures.

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

    Energy Technology Data Exchange (ETDEWEB)

    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

  4. 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

  5. Treatment of acute thoracolumbar burst fractures with kyphoplasty and short pedicle screw fixation: Transpedicular intracorporeal grafting with calcium phosphate: A prospective study

    Directory of Open Access Journals (Sweden)

    Korovessis Panagiotis

    2007-01-01

    Full Text Available Background: In the surgical treatment of thoracolumbar fractures, the major problem after posterior correction and transpedicular instrumentation is failure to support the anterior spinal column, leading to loss of correction and instrumentation failure with associated complaints. We conducted this prospective study to evaluate the outcome of the treatment of acute thoracolumbar burst fractures by transpedicular balloon kyphoplasty, grafting with calcium phosphate cement and short pedicle screw fixation plus fusion. Materials and Methods : Twenty-three consecutive patients of thoracolumbar (T 9 to L 4 burst fracture with or without neurologic deficit with an average age of 43 years, were included in this prospective study. Twenty-one from the 23 patients had single burst fracture while the remaining two patients had a burst fracture and additionally an adjacent A1-type fracture. On admission six (26% out of 23 patients had neurological deficit (five incomplete, one complete. Bilateral transpedicular balloon kyphoplasty with liquid calcium phosphate to reduce segmental kyphosis and restore vertebral body height and short (three vertebrae pedicle screw instrumentation with posterolateral fusion was performed. Gardner kyphosis angle, anterior and posterior vertebral body height ratio and spinal canal encroachment were calculated pre- to postoperatively. Results : All 23 patients were operated within two days after admission and were followed for at least 12 months after index surgery. Operating time and blood loss averaged 45 min and 60 cc respectively. The five patients with incomplete neurological lesions improved by at least one ASIA grade, while no neurological deterioration was observed in any case. The VAS and SF-36 (Role physical and Bodily pain domains were significantly improved postoperatively. Overall sagittal alignment was improved from an average preoperative 16° to one degree kyphosis at final follow-up observation. The anterior

  6. 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.

  7. Radiofrequency Kyphoplasty - An Innovative Method of Treating Osteoporotic Vertebral Body Compression Fractures

    Directory of Open Access Journals (Sweden)

    Drees P

    2011-01-01

    Full Text Available Osteoporotic vertebral body fractures are encountered increasingly often. Cement augmentation using vertebroplasty or balloon kyphoplasty are standardised and established procedures. However, the optimal cement viscosity at the time of cement augmentation has not yet been satisfactory resolved for either method. In other words, the time point of cement application is left to the surgeon’s subjective estimation. Early application of cement may cause cement leakage whereas late application may cause incomplete filling of the vertebral body. Radiofrequency kyphoplasty is a recently developed augmentation system that enables the surgeon to exert control when creating the cavity, as well as aids him in the placement and application of cement. Cement is applied by remote control and thus uniformly retains its properties. The method is presented in the following.

  8. Thermal design and performance of the balloon-borne large aperture submillimeter telescope for polarimetry BLASTPol

    CERN Document Server

    Soler, J D; Angilè, F E; Benton, S J; Devlin, M J; Dober, B; Fissel, L M; Fukui, Y; Galitzki, N; Gandilo, N N; Klein, J; Korotkov, A L; Matthews, T G; Moncelsi, L; Mroczkowski, A; Netterfield, C B; Novak, G; Nutter, D; Pascale, E; Poidevin, F; Savini, G; Scott, D; Shariff, J A; Thomas, N E; Truch, M D; Tucker, C E; Tucker, G S; Ward-Thompson, D

    2014-01-01

    We present the thermal model of the Balloon-borne Large-Aperture Submillimeter Telescope for Polarimetry (BLASTPol). This instrument was successfully flown in two circumpolar flights from McMurdo, Antarctica in 2010 and 2012. During these two flights, BLASTPol obtained unprecedented information about the magnetic field in molecular clouds through the measurement of the polarized thermal emission of interstellar dust grains. The thermal design of the experiment addresses the stability and control of the payload necessary for this kind of measurement. We describe the thermal modeling of the payload including the sun-shielding strategy. We present the in-flight thermal performance of the instrument and compare the predictions of the model with the temperatures registered during the flight. We describe the difficulties of modeling the thermal behavior of the balloon-borne platform and establish landmarks that can be used in the design of future balloon-borne instruments.

  9. Curative effect evaluation of senile osteoporotic vertebral compression fractures with balloon kyphoplasty%球囊扩张椎体后凸成形术治疗老年骨质疏松脊柱压缩骨折的疗效评价

    Institute of Scientific and Technical Information of China (English)

    郭岱琦; 杨欣建; 顾洪生; 田长庆; 陈扬; 余铮

    2014-01-01

    Objective To study the curative effect and safety of senile osteoporotic vertebral compression fractures with balloon ky-phoplasty. Methods The clinical data of 80 patients in our hospital during July 2008 to July 2012 with senile osteoporotic vertebral compres-sion fractures were analysed retrospectively. And the clinical effect was evaluated by observing the charges of visual analog scale (VAS), height of vertebral bodies and Cobb’ s angle, the quality of life score in patients respectively before and after operation. Results The pain of the patients were controlled effectively after operation, and the patients had significant and sustained improvement in anterior and midline ver-tebral body height after operation, with (56. 02 ± 12. 08) % and (58. 19 ± 13. 11) % before preoperation respectively, and (72. 10 ± 16. 19) % and (78. 33 ± 19. 02) % after surgery respectively. VAS score reduced from (8. 31 ± 1. 22) to (1. 65 ± 0. 33) after surgery;Cobb’s angle reduced from (24. 12 ± 3. 28)° to (13. 56 ± 2. 05)° after operation. The differences of the frontal height and flange height, VAS scores, and Cobb’s angle before and after operation were statistically significant (P<0. 05). The incidence of complications reduced from 23. 75% to 1. 25% after operation, which indicates significant difference (P<0. 01). According to QLQC-30 quality of life score, the postoperative life of patients were much better than that of the preoperative life, and the difference of all statistical index were of statistical significance (P<0. 05). Conclusion Balloon kyphoplasty in the treatment of senile osteoporotic vertebral compression fractures has signifi-cant effect and high safety, it should be popularized and applied in clinical.%目的:探讨球囊扩张椎体后凸成形术治疗老年骨质疏松脊柱压缩骨折的疗效及安全性。方法回顾性分析我院2008年7月至2012年7月80例老年骨质疏松脊柱压缩骨折患者的

  10. 人工植骨结合二次球囊扩张在椎体后凸成形术中骨水泥外渗中的临床应用%Clinical application of artificial bone graft combined with the two balloon dilation in prevention of cement extravasation in percutaneous kyphoplasty

    Institute of Scientific and Technical Information of China (English)

    陶学顺; 余润泽; 张长春; 沈政; 曹参

    2014-01-01

    Objective To explore the clinical efficacy of cement extravasation prevention by artificial bone graft combined with the two balloon dilation for the treatment of osteoporotic vertebral compression fractures.Methods Clinical data of 60 cases with osteoporotic thoracolumbar vertebral compression fracture treated by the unilateral pedicle puncture percutaneous kyphoplasty (PKP) were retrospectively analyzed,including 15 cases(T11 3 cases,T12 3 cases,L1 5 cases,L2 2 cases,L4 1 case,L5 1 case) of contrast agent extravasation found in operation.The artificial bone was pressed into powder and tuned into a thick paste ; the thick paste was injected into the vertebral body by the injector.After the second balloon dilatation,bone cement like toothpaste was injected into the vertebral body slowly in X-ray fluoroscopy.Postoperative bone cement extravasation and kyphosis Cobb angle as well as visual analogue scale (VAS) score improvement were observed.According to the degree of pain reliesing evaluate the clinical curative effect.Results All 15 patients were completed the operation.The third day after the operation,the review X-ray showed a good recovery of vertebral height of each disease,the vertebral bone cement filling was good,evenly distributed,without intervertebral,paraspinal or spinal bone cement extravasation.The average Cobb angle of kyphosis was corrected 10.1 ° ± 2.4°,and the average VAS score was reduced by 6.2 ± 0.2.Compared with preoperation,the differences were statistically significant (tCobb =16.299,tvAs =120.062,all P values < 0.01).Fifteen cases were followed up for 4 weeks to 24 weeks,with an average of 19 weeks.The fourth week of the postoperative,X-ray showed that no significant vertebral height of each disease was missing,no new adjacent vertebral fracture was found.The efficacy was evaluated the fourth week after surgery,the symptoms of pain was disappeared or obviously improved,and the patients could walk normally.Among them,2 cases were

  11. Kyphoplasty versus vertebroplasty in the treatment of painful osteoporotic vertebral compression fractures: two-year follow-up in a prospective controlled study.

    Science.gov (United States)

    Du, Junhua; Li, Xigong; Lin, Xiangjin

    2014-12-01

    A total of 112 patients with a single-level osteoporotic vertebral compression fracture who did not respond to conservative therapy were included and allocated to either kyphoplasty or vertebroplasty treatment. The Visual Analogue Scale (VAS) and Oswestry Disability Index (ODI) were used to assess back pain and disability. Anterior, midline, posterior vertebral body heights, and kyphotic angle at the fractured vertebra were measured for radiographic evaluation. Clinical and radiographic follow-up examinations were performed postoperatively at 3, 6, 12 and 24 months. Complications and patient satisfaction with the surgical procedure were also recorded. The follow-up rate was 73.3% in the kyphoplasty group and 80.8% in the vertebroplasty group (P = 0.737). There were no significant differences between the 2 groups with regard to improvement in VAS and ODI scores (P > 0.05) at all postoperative intervals. Both treatment groups achieved marked vertebral height restoration and kyphotic angle reduction, but the radiographic parameters were significantly better in the kyphoplasty group (P kyphoplasty group was 11.4% versus 31% in the vertebroplasty group (P kyphoplasty group and 2 in the vertebroplasty group occurred during 2-year follow-up, and no difference in patient satisfaction was detected between the 2 groups. Kyphoplasty and vertebroplasty achieved similar improvement of clinical outcomes and patient satisfaction at 2 years after surgery, albeit kyphoplasty had more ability to markedly reduce vertebral deformity and resulted in less cement leaks compared with vertebroplasty.

  12. Kyphoplasty

    Science.gov (United States)

    ... patients with cancer: a multicentre, randomised controlled trial. Lancet Oncol . 2011;12(3):225-35. PMID: 21333599 ... vertebral compression fracture (FREE): a randomised controlled trial. Lancet . 2009;373(9668):1016-24. PMID: 19246088 www. ...

  13. Value of forceps biopsy and kyphoplasty in Kümmell's disease.

    Science.gov (United States)

    Wang, Dalin; Wang, Liming; Xu, Jie; Zen, Yiwen; Zheng, Shengnai; Wang, Gangrui

    2013-08-01

    The diagnosis of Kümmell's disease mainly depends on clinical and radiologic findings. However, these are not the gold standards for diagnosing this disease; bone biopsy is required. The authors performed modified bone biopsy and cement-filling techniques during kyphoplasty and investigated the feasibility and efficacy of kyphoplasty for the treatment of Kümmell's disease. This study included 28 patients (9 men and 19 women; average age, 71.9 years) with Kümmell's disease. All patients underwent the modified biopsy procedure and kyphoplasty with the modified cement-filling technique. Treatment efficacy was evaluated using visual analog scale pain scores, Oswestry Disability Index scores, vertebral height, and Cobb angles pre- and postoperatively and at final follow-up. All patients tolerated the procedure well and had immediate back pain relief after kyphoplasty. Biopsy examination revealed necrotic bone in 24 patients and sparse cancellous bone in 2; it was unsuccessful in 2 patients. No severe complication occurred in any patient. Two patients had cement leakage but no clinical symptoms. All efficacy measures were significantly better at the postoperative assessments than the preoperative assessments (PKyphoplasty is a relatively effective and safe method for treating Kümmell's disease when modified techniques are performed to prevent cement leakage, and forceps biopsy can be used in the differential diagnosis of this condition.

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

    Science.gov (United States)

    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

  15. Pumpkin Balloon

    OpenAIRE

    Nishimura, Jun; 西村, 純

    1992-01-01

    The Pumpkin shaped balloons, which are the extreme case of the heart-type balloons had been studied as one of the promising candidate of the super pressure balloons. Here, detailed studies for the features of the pumpkin balloons are described, particularly by comparing with those of the spherical shaped super pressure balloons.

  16. Preliminary clinical outcomes of percutaneous kyphoplasty with Sky-bone expander

    Institute of Scientific and Technical Information of China (English)

    ZHENG Zhao-min; KUANG Guan-ming; DONG Zhi-yong; K.M.C. Cheung; William W. Lu; LI Fo-bao

    2007-01-01

    Background Percutaneous kyphoplasty (PKP) using balloon expander has been proved to be effective in the treatment of painful vertebral compression fractures. Recently, Sky-bone expander, an alternative bone expander for PKP has been developed. The purpose of this study was to show our preliminary clinical outcomes of PKP with Sky-bone expander.Methods PKP with Sky-bone expander was performed in 25 patients (30 vertebrae). The operation time, bleeding volume, cement volume injected were recorded. The pain and functional activities of the patients before and after the operation were compared using Wilcoxon signed-rank test. The cement distribution in the vertebrae, vertebral height restoration, and kyphosis correction after the procedure were evaluated by radiography. The pre- and post-operative absolute values of the vertebral height and kyphotic angle were compared by paired-sample t test. All the patients were followed up by telephone or clinic consulting after being discharged from our hospital.Results The procedure was performed successfully in all the patients. Bipedicular injection was used in 2 of the patients, and unipedicular injection was made in the others. The operation time ranged from 25 to 120 minutes (45 minutes per vertebra on average). The average bleeding volume was about 20 ml. Polymethylmethacrylate1.5 - 5.0 ml (mean, (3.15±0.78) ml) was injected through each pedicle into all the patients except one, who received calcium sulphate 3.5 ml instead. The patients were followed up for 12-15 months (13.5 months on average). The mean visual analogue scale (VAS) score, Oswestry Disability Index, anterior, midline, and posterior vertebral height, and kyphotic angle of the patients were improved significantly at the end of the follow-up compared with those before the operation.(2.5±1.3, 35.1%, (20.94±6.15) mm, (20.26±4.59) mm, (26.72±3.49) mm, and 8.2 degrees vs. 8.5±1.9, 61.2%, (19.11±6.72) mm, (15.88±5.73) mm, (25.78±3.67) mm, and 17.3 degrees

  17. Performance of Large Area X-ray Proportional Counters in a Balloon Experiment

    CERN Document Server

    Roy, J; Dedhia, D K; Manchanda, R K; Shah, P B; Chitnis, V R; Gujar, V M; Parmar, J V; Pawar, D M; Kurhade, V B

    2016-01-01

    ASTROSAT is India's first satellite fully devoted to astronomical observations covering a wide spectral band from optical to hard X-rays by a complement of 4 co-aligned instruments and a Scanning Sky X-ray Monitor. One of the instruments is Large Area X-ray Proportional Counter with 3 identical detectors. In order to assess the performance of this instrument, a balloon experiment with two prototype Large Area X-ray Proportional Counters (LAXPC) was carried out on 2008 April 14. The design of these LAXPCs was similar to those on the ASTROSAT except that their field of view (FOV) was 3$^{\\circ}$ $\\times$ 3$^{\\circ}$ versus FOV of 1$^{\\circ}$ $\\times$ 1$^{\\circ}$ for the LAXPCs on the ASTROSAT. The LAXPCs are aimed at the timing and spectral studies of X-ray sources in 3-80 keV region. In the balloon experiment, the LAXPC, associated electronics and support systems were mounted on an oriented platform which could be pre-programmed to track any source in the sky. A brief description of the LAXPC design, laborator...

  18. 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.

  19. 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.

  20. 数字化三维重建与传统经皮球囊扩张椎体后凸成形的随机对照比较%A randomized controlled comparison between digital three-dimensional reconstruction and percutaneous balloon kyphoplasty

    Institute of Scientific and Technical Information of China (English)

    王磊; 王黎明; 黄艳; 陆钦

    2015-01-01

    背景:术者的经验对经皮球囊扩张椎体后凸成形治疗的手术时间和修复效果有直接影响,数字化技术辅助为优化修复方案开辟了新的思路。  目的:比较数字化技术辅助与传统经皮球囊扩张椎体后凸成形治疗在手术时间和修复效果方面的差异。  方法:选择2013年1月1日至2014年11月20日江苏省淮安市第二人民医院骨科收治的经皮球囊扩张椎体后凸成形患者64例。采用随机对照的方法,根据入院先后顺序,单数行数字化技术辅助经皮球囊扩张椎体后凸成形治疗(试验组),偶数行传统经皮球囊扩张椎体后凸成形治疗(对照组)。对两组患者的发病年龄、治疗前目测类比评分、手术时间、治疗后3 d目测类比评分以及治疗前后目测类比评分下降值等指标进行对比分析。结果与结论:经统计学分析数字化技术辅助与传统经皮球囊扩张椎体后凸成形治疗在手术时间、治疗后3 d目测类比评分和治疗前后目测类比下降值方面差异均有显著性意义(P METHODS:A total of 64 patients treated with percutaneous baloon kyphoplasty in the Department of Orthopedics of the Second People’s Hospital of Huaian from January 1, 2013 to November 20, 2014 were enroled in this study. Using a randomized controled method, according to the order of admission, odd number received digital technology-assisted percutaneous baloon kyphoplasty (experimental group). Even number received percutaneous baloon kyphoplasty (control group). Onset age, preoperative visual analogue scale score, operation time, 3-day postoperative visual analogue scale score and the decreased value of visual analogue scale score were compared and analyzed between the two groups. RESULTS AND CONCLUSION:Significant differences in operation time, 3-day postoperative visual analogue scale score and the decreased value of visual analogue scale score were detected between the two

  1. Performance of large area x-ray proportional counters in a balloon experiment

    Science.gov (United States)

    Roy, J.; Agrawal, P. C.; Dedhia, D. K.; Manchanda, R. K.; Shah, P. B.; Chitnis, V. R.; Gujar, V. M.; Parmar, J. V.; Pawar, D. M.; Kurhade, V. B.

    2016-10-01

    ASTROSAT is India's first satellite fully devoted to astronomical observations covering a wide spectral band from optical to hard X-rays by a complement of 4 co-aligned instruments and a Scanning Sky X-ray Monitor. One of the instruments is Large Area X-ray Proportional Counter with 3 identical detectors. In order to assess the performance of this instrument, a balloon experiment with two prototype Large Area X-ray Proportional Counters (LAXPC) was carried out on 2008 April 14. The design of these LAXPCs was similar to those on the ASTROSAT except that their field of view (FOV) was 3 ∘ × 3 ∘ versus FOV of 1 ∘ × 1 ∘ for the LAXPCs on the ASTROSAT. The LAXPCs are aimed at the timing and spectral studies of X-ray sources in 3-80 keV region. In the balloon experiment, the LAXPC, associated electronics and support systems were mounted on an oriented platform which could be pre-programmed to track any source in the sky. A brief description of the LAXPC design, laboratory tests, calibration and the detector characteristics is presented here. The details of the experiment and background counting rates of the 2 LAXPCs at the float altitude of about 41 km are presented in different energy bands. The bright black hole X-ray binary Cygnus X-1 (Cyg X-1) was observed in the experiment for ˜ 3 hours. Details of Cyg X-1 observations, count rates measured from it in different energy intervals and the intensity variations of Cyg X-1 detected during the observations are presented and briefly discussed.

  2. Mars Solar Balloon Lander Project

    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...

  3. Balloon-guided navigation technique to perform stenting in an acutely angled anterior cerebral artery.

    Science.gov (United States)

    Cohen, José E; Gomori, John M; Moscovici, Samuel; Itshayek, Eyal

    2012-03-01

    The complex anatomic features of wide-necked anterior communicating artery aneurysms represent an endovascular challenge. Compliant balloons and microstents are frequently required to achieve aneurysm occlusion. When the angle between the A1 and A2 segments is acute, microcatheter navigation is hazardous, and may be difficult or sometimes impossible with standard techniques. We present our technique using a support balloon to facilitate guidewire engagement and navigation of A2, and to assist with microcatheterization in this unfavorable vascular anatomy.

  4. The thermal design, characterization, and performance of the SPIDER long-duration balloon cryostat

    Science.gov (United States)

    Gudmundsson, J. E.; Ade, P. A. R.; Amiri, M.; Benton, S. J.; Bock, J. J.; Bond, J. R.; Bryan, S. A.; Chiang, H. C.; Contaldi, C. R.; Crill, B. P.; Dore, O.; Filippini, J. P.; Fraisse, A. A.; Gambrel, A.; Gandilo, N. N.; Hasselfield, M.; Halpern, M.; Hilton, G.; Holmes, W.; Hristov, V. V.; Irwin, K. D.; Jones, W. C.; Kermish, Z.; MacTavish, C. J.; Mason, P. V.; Megerian, K.; Moncelsi, L.; Montroy, T. E.; Morford, T. A.; Nagy, J. M.; Netterfield, C. B.; Rahlin, A. S.; Reintsema, C. D.; Ruhl, J. E.; Runyan, M. C.; Shariff, J. A.; Soler, J. D.; Trangsrud, A.; Tucker, C.; Tucker, R. S.; Turner, A. D.; Wiebe, D. V.; Young, E.

    2015-12-01

    We describe the SPIDER flight cryostat, which is designed to cool six millimeter-wavelength telescopes during an Antarctic long-duration balloon flight. The cryostat, one of the largest to have flown on a stratospheric payload, uses liquid 4 He to deliver cooling power to stages at 4.2 and 1.6 K. Stainless steel capillaries facilitate a high flow impedance connection between the main liquid helium tank and a smaller superfluid tank, allowing the latter to operate at 1.6 K as long as there is liquid in the 4.2 K main tank. Each telescope houses a closed cycle 3 He adsorption refrigerator that further cools the focal planes down to 300 mK. Liquid helium vapor from the main tank is routed through heat exchangers that cool radiation shields, providing negative thermal feedback. The system performed successfully during a 17 day flight in the 2014-2015 Antarctic summer. The cryostat had a total hold time of 16.8 days, with 15.9 days occurring during flight.

  5. The Thermal Design, Characterization, and Performance of the SPIDER Long-Duration Balloon Cryostat

    CERN Document Server

    Gudmundsson, J E; Amiri, M; Benton, S J; Bock, J J; Bond, J R; Bryan, S A; Chiang, H C; Contaldi, C R; Crill, B P; Doré, O; Filippini, J P; Fraisse, A A; Gambrel, A; Gandilo, N N; Hasselfield, M; Halpern, M; Hilton, G C; Holmes, W; Hristov, V V; Irwin, K D; Jones, W C; Kermish, Z; MacTavish, C J; Mason, P V; Megerian, K; Moncelsi, L; Montroy, T E; Morford, T A; Nagy, J M; Netterfield, C B; Rahlin, A S; Reintsema, C D; Ruhl, J E; Runyan, M C; Shariff, J A; Soler, J D; Trangsrud, A; Tucker, C; Tucker, R S; Turner, A D; Wiebe, D V; Young, E

    2015-01-01

    We describe the SPIDER flight cryostat, which is designed to cool six millimeter-wavelength telescopes during an Antarctic long-duration balloon flight. The cryostat, one of the largest to have flown on a stratospheric payload, uses liquid helium-4 to deliver cooling power to stages at 4.2 and 1.6 K. Stainless steel capillaries facilitate a high flow impedance connection between the main liquid helium tank and a smaller superfluid tank, allowing the latter to operate at 1.6 K as long as there is liquid in the 4.2 K main tank. Each telescope houses a closed cycle helium-3 adsorption refrigerator that further cools the focal planes down to 300 mK. Liquid helium vapor from the main tank is routed through heat exchangers that cool radiation shields, providing negative thermal feedback. The system performed successfully during a 17 day flight in the 2014-2015 Antarctic summer. The cryostat had a total hold time of 16.8 days, with 15.9 days occurring during flight.

  6. Vertebroplasty and kyphoplasty in patients with osteoporotic fractures: secured knowledge and open questions; Vertebroplastie und Kyphoplastie bei osteoporotischen Wirbelkoerperfrakturen: Gesicherte Kenntnisse, offene Fragen

    Energy Technology Data Exchange (ETDEWEB)

    Bohndorf, K.; Fessl, R. [Klinikum Augsburg, Klinik fuer diagnostische Radiologie und Neuroradiologie, Augsburg (Germany)

    2006-10-15

    Cementoplasty, performed either as percutaneous vertebroplasty or kyphoplasty, has become well established as an effective technique to treat painful vertebral body fractures. It has low complication rates, is successful in alleviating pain, and improves the patients' mobility and quality of life. A series of questions remain open though or are the subject of controversial debate; for example, the results of several biomechanical studies are in part contradictory. Clinical data on subsequent fractures are also still inadequate, although the majority of studies show no elevated rate of subsequent fractures following treatment with cementoplasty in comparison to the natural course in patients with osteoporotic fractures. Kyphoplasty has the advantage of being able to restore the vertebral body height or reduce the kyphosis angle without leading to different clinical outcomes in comparison to vertebroplasty. Biomechanical considerations on whether restoration of the vertebral body's normal shape could reduce the rate of subsequent fractures still need scientific substantiation. Both surgical methods are employed in our clinic. Kyphoplasty seems to us to be indicated when the height of the anterior portion of the vertebral body is reduced by one-third compared to the norm or a kyphosis angle of more than 15-20 is present. The goals of therapy are restoring the shape and reducing the kyphosis angle. This can only succeed, however, in fractures that are not older than 3 weeks. In all other cases vertebroplasty is performed. (orig.) [German] Die Zementoplastie, entweder als perkutane Vertebro- oder Kyphoplastie ausgefuehrt, hat sich als effiziente Technik fuer die Behandlung schmerzhafter Wirbelkoerperfrakturen etabliert. Sie hat geringe Komplikationsraten, ist erfolgreich bei der Schmerzlinderung und verbessert die Mobilitaet und Lebensqualitaet der Patienten. Allerdings ist eine Reihe von Fragen noch offen oder Gegenstand einer kontroversen Debatte, so sind z

  7. Performance characteristics of retrograde single-balloon endoscopy: A single center experience

    Institute of Scientific and Technical Information of China (English)

    Kaci E Christian; Karan Kapoor; Eric M Goldberg

    2016-01-01

    AIM: To evaluate the technical success, diagnostic yield(DY) and therapeutic potential of retrograde single balloon enteroscopy(rS BE). METHODS: A retrospective review of 136 rS BE procedures performed at a tertiary academic referral center from January 2006 and September 2013 was completed. Patient characteristics including age, gender and inpatient status were collected. The indication for the procedure was categorized into one of three groups: Obscure gastrointestinal bleeding(GIB), evaluation for Crohn’s disease and abnormal imaging. Procedural characteristics including insertion depth(ID), procedure time, concordance with pre-procedural imaging and complications were also recorded. Lastly, DY, defined as the percentage of cases producing either a definitive diagnosis or findings that could explain clinical symptoms and therapeutic yield(TY), defined as the percentage of cases in which a definitive intervention was performed, were determined. Mucosal tattooing and biopsy alone were not included in the TY. RESULTS: A total of 136 rS BE procedures were identified. Mean patient age was 57.5(± 16.2) years, 67(49.2%) were male, and 110(80.9%) procedures were performed on an outpatient basis. Indications for rS BE included GIB in 55(40.4%), evaluation of inflammatory bowel disease(IBD) in 29(21.3%), and imaging suggestive of pathology other than GIB or IBD in 43(31.6%). Nine(6.6%) rS BEs were performed for other indications. Mean ID was 68.3(± 39.3) cm proximal to the ileocecal valve and mean time to completion was 41.7(± 15.5) min. Overall, 73(53.7%) cases were diagnostic and 25(18.4%) cases were therapeutic in which interventions(argon plasma coagulation, stricture dilatation, polypectomy, etc.) were performed. Pre-procedural imaging was performed in 88(64.7%) patients. Endoscopic concordance of positive imaging findings was seen in 31(35.2%) cases. Follow up data was available in 93(68.4%) patients; 2(2.2%) reported post-procedural abdominal pain within 30 d

  8. Reducing Door to- Balloon- Time for Acute ST Elevation Myocardial Infarction In Primary Percutaneous Intervention: Transformation using Robust Performance Improvement.

    Science.gov (United States)

    Ellahham Md, Samer; Aljabbari, Samir; Harold Mananghaya, Tristan; J Raji, Salama; Al Zubaidi, Abdulmajeed

    2015-01-01

    Cardiovascular diseases (CVDs) are the leading causes of death in the UAE. Prompt reperfusion access is essential for patients who have Myocardial Infarction (MI) with ST-segment elevation as they are at a relatively high risk of death.This risk may be reduced by primary percutaneous coronary intervention (PCI), but only if it is performed in a timely manner. Guidelines recommend that the interval between arrival at the hospital and intracoronary balloon inflation (door-to-balloon (D2B) time) during primary PCI should be 90 minutes or less. The earlier therapy is initiated, the better the outcome. Our aim was to decrease the door-to-balloon time for patients with ST segment elevation myocardial infarction (STEMI) who come through the emergency department (ED) in Sheikh Khalifa Medical City,a tertiary hospital in UAE, to meet the standard of less than 90 minutes. A multidisciplinary team was formed including interventional cardiologists, catheterization laboratory personnel, emergency department caregivers and quality staff. The project utilized the Lean Six Sigma Methodology which provided a powerful approach to quality improvement. The process minimized waste and variation, and a decreased median door-to-balloon time from 75.9 minutes to 60.1 minutes was noted. The percentage of patients who underwent PCI within 90 minutes increased from 73% to 96%. In conclusion, implementing the Lean Six Sigma methodology resulted in having processes that are leaner, more efficient and minimally variable. While recent publication failed to provide evidence of better outcome, the lessons learned were extrapolated to other primary percutaneous coronary intervention centers in our system.This would have marked impact on patient safety, quality of care and patient experience.

  9. Reducing Door to- Balloon- Time for Acute ST Elevation Myocardial Infarction In Primary Percutaneous Intervention: Transformation using Robust Performance Improvement

    Science.gov (United States)

    Ellahham, MD, Samer; Aljabbari, Samir; Harold Mananghaya, Tristan; J. Raji, Salama; Al Zubaidi, Abdulmajeed

    2015-01-01

    Cardiovascular diseases (CVDs) are the leading causes of death in the UAE. Prompt reperfusion access is essential for patients who have Myocardial Infarction (MI) with ST-segment elevation as they are at a relatively high risk of death.This risk may be reduced by primary percutaneous coronary intervention (PCI), but only if it is performed in a timely manner. Guidelines recommend that the interval between arrival at the hospital and intracoronary balloon inflation (door-to-balloon (D2B) time) during primary PCI should be 90 minutes or less. The earlier therapy is initiated, the better the outcome. Our aim was to decrease the door-to-balloon time for patients with ST segment elevation myocardial infarction (STEMI) who come through the emergency department (ED) in Sheikh Khalifa Medical City,a tertiary hospital in UAE, to meet the standard of less than 90 minutes. A multidisciplinary team was formed including interventional cardiologists, catheterization laboratory personnel, emergency department caregivers and quality staff. The project utilized the Lean Six Sigma Methodology which provided a powerful approach to quality improvement. The process minimized waste and variation, and a decreased median door-to-balloon time from 75.9 minutes to 60.1 minutes was noted. The percentage of patients who underwent PCI within 90 minutes increased from 73% to 96%. In conclusion, implementing the Lean Six Sigma methodology resulted in having processes that are leaner, more efficient and minimally variable. While recent publication failed to provide evidence of better outcome, the lessons learned were extrapolated to other primary percutaneous coronary intervention centers in our system.This would have marked impact on patient safety, quality of care and patient experience. PMID:26734321

  10. Non-small-bowel lesions encountered during double-balloon enteroscopy performed for obscure gastrointestinal bleeding

    Institute of Scientific and Technical Information of China (English)

    Hoi-Poh; Tee; Arthur; J; Kaffes

    2010-01-01

    AIM:To report the incidence of non-small-bowel bleeding pathologies encountered during double-balloon enteroscopy (DBE) procedures and to analyse their significance.METHODS: A retrospective study of a prospective DBE database conducted in a tertiary-referral center was conducted. A total of 179 patients with obscure gastrointestinal bleeding (OGIB) referred for DBE from June 2004 to November 2008 were analysed looking for the incidence of non-small-bowel lesions (NSBLs; all and newly diagnosed) encountered ...

  11. 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.

  12. 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.)

  13. Performance of the CAPRICE RICH detector during the 1994 balloon flight

    Energy Technology Data Exchange (ETDEWEB)

    Barbiellini, G.; Basini, G.; Bellotti, R.; Bocciolini, M.; Boezio, M.; Massimo Brancaccio, F.; Bravar, U.; Cafagna, F.; Candusso, M.; Carlson, P.; Casolino, M.; Castellano, M.; De Cataldo, G.; Circella, M.; Codino, A.; Finetti, N.; Francke, T.; Giglietto, N.; Golden, R.L.; Grimani, C.; Hof, M.; Marangelli, B.; De Marzo, C.N.; Mitchell, J.W.; Morselli, A.; De Pascale, M.P.; Papini, P.; Perego, A.; Piccardi, S.; Picozza, P.; Ricci, M.; Schiavon, P.; Simon, M.; Sparvoli, R.; Spillantini, P.; Spinelli, P.; Stephens, S.A.; Stochaj, S.J.; Streitmatter, R.E.; Suffert, M.; Vacchi, A.; Weber, N.; Zampa, N. [Particle Astrophysics Lab, New Mexico State Univ., Las Cruces, NM (United States)]|[Tata Institute of fundamental Research, Bombay (India)]|[Goddard Space Flight Center/NASA, Greenbelt, MD (United States)]|[Royal Institute of Technology, Stockholm (Sweden)]|[Centre de Recherches Nucleaires, Strasbourg (France)]|[Dipartimento di Fisica dell`Univ. di Perugia and INFN-Sezione di Perugia, Perugia (Italy)]|[INFN Laboratori Nazionali di Frascati, Frascati (Italy)]|[Dipartimento di Fisica dell`Univ. di Firenze and INFN-Sezione di Firenze, Florence (Italy)]|[Dipartimento di Fisica dell`Univ. di Roma II ``Tor Vergata`` and INFN-Sezione di Roma II ``Tor Vergata``, Roma (Italy)]|[Dipartimento di Fisica dell`Univ. di Trieste and INFN-Sezione di Trieste, Trieste (Italy)]|[Dipartimento di Fisica dell`Univ. di Bari and INFN-Sezione di Bari, Trieste (Italy)]|[University of Siegen, Siegen (Germany)

    1996-03-01

    A RICH detector capable of detecting unit charged particles, e.g. antiprotons and positrons, has been used successfully for the first time in a balloon-borne magnet spectrometer. The thin and compact CAPRICE RICH detector uses a NaF solid radiator, TMAE vapour as photoconverter and cathode pad readout in the photosensitive MWPC operated at low gain. 15 photoelectrons are detected per ring for {beta}=1, perpendicular incidence particles giving a resolution on the Cherenkov angle of 8 mrad, increasing to 14 mrad at 20 incidence angle. Besides particle identification on an event-by-event basis it efficiently rejects multiparticle events and albedo particles. (orig.).

  14. 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.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2001-05-01

    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 out 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}{approx_equal}1 charge one particles, an average of 12 photoelectrons per event were detected. The reconstructed Cherenkov angle of 50 mrad for a {beta}{approx_equal}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 used in a balloon-borne experiment capable of identifying charge one particles at energies above 5 GeV. The RICH provided an identification of cosmic ray antiprotons up to the highest energies ever studied (about 50 GeV of total energy). The spectrometer was flown on 28-29 May 1998 from Fort Sumner, New Mexico, USA.

  16. Precise Pointing and Stabilization Performance for the Balloon-borne Imaging Testbed (BIT): 2015 Test Flight

    CERN Document Server

    Romualdez, L J; Damaren, C J; Galloway, M N; Hartley, J W; Li, L; Massey, R J; Netterfield, C B

    2016-01-01

    Balloon-borne astronomy offers an attractive option for experiments that require precise pointing and attitude stabilization, due to a large reduction in the atmospheric interference observed by ground-based systems as well as the low-cost and short development time-scale compared to space-borne systems. The Balloon-borne Imaging Testbed (BIT) is an instrument designed to meet the technological requirements of high precision astronomical missions and is a precursor to the development of a facility class instrument with capabilities similar to the Hubble Space Telescope. The attitude determination and control systems (ADCS) for BIT, the design, implementation, and analysis of which are the focus of this paper, compensate for compound pendulation effects and other sub-orbital disturbances in the stratosphere to within 1-2$^{\\prime\\prime}$ (rms), while back-end optics provide further image stabilization down to 0.05$^{\\prime\\prime}$ (not discussed here). During the inaugural test flight from Timmins, Canada in S...

  17. Kyphoplasty interventions using a navigation system and C-arm CT data: first clinical results

    Science.gov (United States)

    Hoheisel, Martin; Skalej, Martin; Beuing, Oliver; Bill, Ulrich; Klingenbeck-Regn, Klaus; Petzold, Ralf; Nagel, Markus H.

    2009-02-01

    This study evaluates new applications using a novel navigation system with electromagnetic (EM) tracking in clinical routine. The navigation system (iGuide CAPPA, CAS innovations, Erlangen, Germany) consists of a PC with dedicated navigation software, the AURORA tracking system (NDI, Waterloo Ontario, Canada; needles equipped with small coils in their tips for EM navigation. After patient positioning a 3D C-arm data set of the spine region of interest is acquired. The images are reconstructed and the 3D data set is directly transferred to the navigation system. Image loading and image to patient registration are performed automatically by the navigation system. For image acquisition a C-arm system with DynaCT option (AXIOM Artis, Siemens Healthcare, Forchheim, Germany) was used. As new clinical applications we performed kyphoplasty for reconstruction of collapsed vertebrae. All interventions were carried out without any complication. After a single planning scan the radiologists were able to place the needle in the designated vertebra. During needle driving 2D imaging was performed just in a few cases for control reasons. The time between planning and final needle positioning was reduced in all cases compared to conventional methods. Moreover, the number of control scans could be markedly reduced. The deviation of the needle to the planned target was less than 2 mm. The use of DynaCT images in combination with electromagnetic tracking-based navigation systems allows a precise needle positioning for kyphoplasty.

  18. Telescope performance and image simulations of the balloon-borne coded-mask protoMIRAX experiment

    Energy Technology Data Exchange (ETDEWEB)

    Penacchioni, A. V., E-mail: ana.penacchioni@inpe.br; Braga, J., E-mail: joao.braga@inpe.br; Castro, M. A., E-mail: manuel.castro@inpe.br; Sacahui, J. R., E-mail: rodrigo.sacahui@inpe.br; D’Amico, F., E-mail: flavio.damico@inpe.br [Instituto Nacional de Pesquisas Espaciais (INPE) São José dos Campos (Brazil)

    2015-12-17

    In this work we present the results of imaging simulations performed with the help of the GEANT4 package for the protoMIRAX hard X-ray balloon experiment. The instrumental background was simulated taking into account the various radiation components and their angular dependence, as well as a detailed mass model of the experiment. We modelled the meridian transits of the Crab Nebula and the Galactic Centre (CG) region during balloon flights in Brazil (∼ −23° of latitude and an altitude of ∼40 km) and introduced the correspondent spectra as inputs to the imaging simulations. We present images of the Crab and of three sources in the GC: 1E 1740.7-2942, GRS 1758-258 and GX 1+4. The results show that the protoMIRAX experiment is capable of making spectral and timing observations of bright hard X-ray sources as well as important imaging demonstrations that will contribute to the design of the MIRAX satellite mission.

  19. Telescope performance and image simulations of the balloon-borne coded-mask protoMIRAX experiment

    CERN Document Server

    Penacchioni, A V; Castro, M A; D'Amico, F

    2015-01-01

    In this work we present the results of imaging simulations performed with the help of the GEANT4 package for the protoMIRAX hard X-ray balloon experiment. The instrumental background was simulated taking into account the various radiation components and their angular dependence, as well as a detailed mass model of the experiment. We modeled the meridian transits of the Crab Nebula and the Galatic Centre region during balloon flights in Brazil ($\\sim -23^{\\circ}$ of latitude and an altitude of $\\sim 40 \\thinspace$ km) and introduced the correspondent spectra as inputs to the imaging simulations. We present images of the Crab and of three sources in the Galactic Centre region: 1E 1740.7-2942, GRS 1758-258 and GX 1+4. The results show that the protoMIRAX experiment is capable of making spectral and timing observations of bright hard X-ray sources as well as important imaging demonstrations that will contribute to the design of the MIRAX satellite mission.

  20. Predictors of delayed failure of structural kyphoplasty for pathological compression fractures in cancer patients.

    Science.gov (United States)

    Rajah, Gary; Altshuler, David; Sadiq, Omar; Nyame, V Kwasi; Eltahawy, Hazem; Szerlip, Nicholas

    2015-08-01

    OBJECT Pathological compression fractures in cancer patients cause significant pain and disability. Spinal metastases affect quality of life near the end of life and may require multiple procedures, including medical palliative care and open surgical decompression and fixation. An increasingly popular minimally invasive technique to treat metastatic instabilities is kyphoplasty. Even though it may alleviate pain due to pathological fractures, it may fail. However, delayed kyphoplasty failures with retropulsed cement and neural element compression have not been well reported. Such failures necessitate open surgical decompression and stabilization, and cement inserted during the kyphoplasty complicates salvage surgeries in patients with a disease-burdened spine. The authors sought to examine the incidence of delayed failure of structural kyphoplasty in a series of cement augmentations for pathological compression fractures. The goal was to identify risk predictors by analyzing patient and disease characteristics to reduce kyphoplasty failure and to prevent excessive surgical procedures at the end of life. METHODS The authors retrospectively reviewed the records of all patients with metastatic cancer from 2010 to 2013 who had undergone a procedure involving cement augmentation for a pathological compression fracture at their institution. The authors examined the characteristics of the patients, diseases, and radiographic fractures. RESULTS In total, 37 patients underwent cement augmentation in 75 spinal levels during 45 surgeries. Four patients had delayed structural kyphoplasty failure necessitating surgical decompression and fusion. The mean time to kyphoplasty failure was 2.88 ± 1.24 months. The mean loss of vertebral body height was 16% in the patients in whom kyphoplasty failed and 32% in patients in whom kyphoplasty did not fail. No posterior intraoperative cement extravasation was observed in the patients in whom kyphoplasty had failed. The mean spinal

  1. Tuberculous Spondylitis Following Kyphoplasty: A Case Report and Review of the Literature.

    Science.gov (United States)

    Ge, Chao-Yuan; He, Li-Ming; Zheng, Yong-Hong; Liu, Tuan-Jiang; Guo, Hua; He, Bao-Rong; Qian, Li-Xiong; Zhao, Yuan-Tin; Yang, Jun-Song; Hao, Ding-Jun

    2016-03-01

    Tuberculous spondylitis of the augmented vertebral column following percutaneous vertebroplasty or kyphoplasty has rarely been described. We report an unusual case of tuberculous spondylitis diagnosed after percutaneous kyphoplasty (PKP). A 61-year-old woman presented to our institution complaining of back pain following a fall 7 days before. Radiologic studies revealed an acute osteoporotic compression L1 fracture. The patient denied history of pulmonary tuberculosis (TB) and there were no signs of infection. The patient was discharged from hospital 4 days after undergoing L1 PKP with a dramatic improvement in her back pain. Two years later, the patient was readmitted with a 1 year history of recurrent back pain. Imaging examinations demonstrated long segmental bony destruction involving L1 vertebra with massive paravertebral abscess formation. The tentative diagnosis of tuberculous spondylitis was made, after a serum T-SPOT. The TB test was found to be positive. Anterior debridement, L1 corpectomy, decompression, and autologous rib graft interposition, and posterior T8-L4 instrumentation were performed. The histologic examination of the resected tissue results confirmed the diagnosis of spinal TB. Anti-TB medications were administered for 12 months and the patient recovered without sequelae. Spinal TB and osteoporotic vertebral compression fractures are similar clinically and radiologically. Spinal surgeons should consider this disease entity to avoid misdiagnosis or complications. Early surgical intervention and anti-TB treatment should be instituted as soon as the diagnosis of spinal TB after vertebral augmentation is made.

  2. The Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry-BLASTPol: Performance and results from the 2012 Antarctic flight

    CERN Document Server

    Galitzki, N; Angilé, F E; Benton, S J; Devlin, M J; Dober, B; Fissel, L M; Fukui, Y; Gandilo, N N; Klein, J; Korotkov, A L; Matthews, T G; Moncelsi, L; Netterfield, C B; Novak, G; Nutter, D; Pascale, E; Poidevin, F; Savini, G; Scott, D; Shariff, J A; Soler, J D; Tucker, C E; Tucker, G S; Ward-Thompson, D

    2014-01-01

    The Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry (BLASTPol) is a suborbital mapping experiment, designed to study the role played by magnetic fields in the star formation process. BLASTPol observes polarized light using a total power instrument, photolithographic polarizing grids, and an achromatic half-wave plate to modulate the polarization signal. During its second flight from Antarctica in December 2012, BLASTPol made degree scale maps of linearly polarized dust emission from molecular clouds in three wavebands, centered at 250, 350, and 500 microns. The instrumental performance was an improvement over the 2010 BLASTPol flight, with decreased systematics resulting in a higher number of confirmed polarization vectors. The resultant dataset allows BLASTPol to trace magnetic fields in star-forming regions at scales ranging from cores to entire molecular cloud complexes.

  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. 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.

  5. 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.

  6. Combining physiotherapy with ballon kyphoplasty to treat osteoporotic vertebral compression fracture%康复训练结合脊柱后凸成形术治疗骨质疏松性脊柱压缩型骨折的疗效观察

    Institute of Scientific and Technical Information of China (English)

    曾恒; 李锋; 陈安民; 郭风劲

    2008-01-01

    Objective To evaluate the safety and effectiveness of balloon kyphoplasty combined with physiotherapy in the treatment of osteoporotic vetcrbral compression fractures (OVCFs). Methods A retrospective review was of 12 OVCF cases ( including 16 fracture vertebrae) treated with balloon kyphoplasty was performed. Each patient had also been treated with anti-osteoporotic medication and the Rehabilitation of Osteoporosis Program-Exercise (ROPE) protocol, and each had received a six-month follow-up visit. The following parameters were recorded before the operation and 1 day and 6 months afterward : fracture recurrence, the severity of pain before and after treatment, and the change of vertebral height. The severity of pain was evaluated by using a visual analogue scale (VAS). Results During the treatment, no complication or adverse event was found. The average VAS values preoperation, postoperation and at the 6-month follow-up were 7.6±1.3, 2.1±1.2 and 2.6±1.4, respectively. The average changes in vertebral height preoperation, postoperation and at the 6-month follow-up were 49.2±18% , 74.3 ±14% and 69.8±16% respectively. All of the measures evaluated improved noticeably after the combined treatment. Conclusion Balloon kyphoplasty combined with anti-osteoporotie medication and physiotherapy showed good effects in the treatment of osteoporotic veterbral compression fractures.%目的 观察球囊扩张脊柱后凸成形术(bKP)、抗骨质疏松药物及康复训练联合治疗骨质疏松性脊柱压缩型骨折的疗效及安全性.方法 采用bKP手术治疗12例骨质疏松性脊柱压缩型骨折患者(共计16个患椎),同时给予抗骨质疏松药物治疗及按照骨质疏松康复训练计划(ROPE)进行康复锻炼,每位患者均随访6个月.观察患者术前、术后1d及随访6个月时的并发症、新发骨折、疼痛程度及骨折椎体高度变化情况,采用视觉模拟评分法(VAS)对患者疼痛程度进行评定.结果 在本研究治

  7. Percutaneous kyphoplasty for the treatment of spinal metastases

    Science.gov (United States)

    CHEN, FENG; XIA, YONG-HUI; CAO, WEN-ZHEN; SHAN, WEI; GAO, YANG; FENG, BO; WANG, DIFEI

    2016-01-01

    The bones are the most common location for metastases, which may cause severe pain and damage, including osteolytic destruction and fractures. Pathological fractures of the spine are extremely painful and cause significant disability and morbidity in patients. Traditional open surgery has numerous complications, and radiation therapy may take weeks to become effective. To avoid the trauma and complication of open surgery, percutaneous kyphoplasty (PKP) is a minimally invasive procedure that has played a great role in the treatment of spinal metastases over the past several years. To evaluate the efficacy and safety of the treatment of spinal metastasis using PKP, the present study evaluated 282 patients who had received PKP between April 2009 and June 2014. The efficacy of PKP was evaluated using the visual analog scale for pain (VAS), Karnofsky performance score (KPS) and quality of life (QOL) score (short form with 36 questions). The KPS and QOL were measured pre-operatively and 3 months post-operatively. In addition, radiographical data, including the degree of restoration of the kyphotic angle and the anterior vertebral height, and leakage of bone cement, were measured. The safety of the surgery was assessed by complications and side effects reported during or subsequent to surgery. The present study measured the parameters prior to the surgery and at 24 h, 3 months, 6 months and 1 year post-surgery, as well as at the last follow-up date. The range of the follow-up time was between 105 days and 15 months (mean, 401 days). The 282 patients underwent successful operations and the pain felt by the patients prior to the surgery was significantly alleviated. In addition, the analgesic intake of patients greatly decreased following PKP. KPS improved prior to and 3 months after the surgery. QOL also improved prior to and 3 months after the surgery. Radiographical data demonstrated that the kyphotic angle decreased following PKP, and the anterior vertebral height

  8. 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.

  9. Scientific ballooning in India: recent developments

    Science.gov (United States)

    Joshi, M. N.; Damle, S. V.

    The National Scientific Balloon Facility (NBF) of the Tata Institute of Fundamental Research (TIFR) has been conducting regular balloon flights for various experiments in the areas of Space Astronomy and Atmospheric Sciences. A continuous improvement in all aspects of Scientific Ballooning through a sustained R and D programme ensures uptodate services and a better handle on the design specifications for the balloon. Recent developments in balloon grade films, continuous improvements in design specifications, balloon manufacturing methods, flight operational procedures and improved balloon flight capabilities have resulted in a greatly improved flight performance in the last five years. A launch capability upgradation programme in terms of new launch spool and new launch vehicle has been initiated to be able to safely launch balloons with gross lifts upto 3500 kg, balloon volumes upto 450,000 m^3 and payloads upto 1400 kg. A series of steps have been initiated to improve long duration flight capabilities. In this paper, we present details on some of these aspects of Scientific Ballooning in India.

  10. Kyphoplasty increases vertebral height, decreases both pain score and opiate requirements while improving functional status.

    Science.gov (United States)

    Tolba, Reda; Bolash, Robert B; Shroll, Joshua; Costandi, Shrif; Dalton, Jarrod E; Sanghvi, Chirag; Mekhail, Nagy

    2014-03-01

    Vertebral compression fractures can result from advanced osteoporosis, or less commonly from metastatic or traumatic insults to the vertebral column, and result in disabling pain and decreased functional capacity. Various vertebral augmentation options including kyphoplasty aim at preventing the sequelae of pain and immobility that can develop as the result of the vertebral fractures. The mechanism for pain relief following kyphoplasty is not entirely understood, and the restoration of a portion of the lost vertebral height is a subject of debate. We retrospectively reviewed radiographic imaging, pain relief, analgesic intake and functional outcomes in 67 consecutive patients who underwent single- or multilevel kyphoplasty with the primary goal of quantifying the restoration of lost vertebral height. We observed a mean of 45% of the lost vertebral height restored postprocedurally. Secondarily, kyphoplasty was associated with significant decreases in pain scores, daily morphine consumption and improvement in patient-reported functional measures.

  11. Newly Shaped Intra‐Aortic Balloons Improve the Performance of Counterpulsation at the Semirecumbent Position: An In Vitro Study

    Science.gov (United States)

    Kolyva, Christina; Pepper, John R.

    2016-01-01

    Abstract The major hemodynamic benefits of intra‐aortic balloon pump (IABP) counterpulsation are augmentation in diastolic aortic pressure (P aug) during inflation, and decrease in end‐diastolic aortic pressure (ΔedP) during deflation. When the patient is nursed in the semirecumbent position these benefits are diminished. Attempts to change the shape of the IAB in order to limit or prevent this deterioration have been scarce. The aim of the present study was to investigate the hemodynamic performance of six new IAB shapes, and compare it to that of a traditional cylindrical IAB. A mock circulation system, featuring an artificial left ventricle and an aortic model with 11 branches and physiological resistance and compliance, was used to test one cylindrical and six newly shaped IABs at angles 0, 10, 20, 30, and 40°. Pressure was measured continuously at the aortic root during 1:1 and 1:4 IABP support. Shape 2 was found to consistently achieve, in terms of absolute magnitude, larger ΔedP at angles than the cylindrical IAB. Although ΔedP was gradually diminished with angle, it did so to a lesser degree than the cylindrical IAB; this diminishment was only 53% (with frequency 1:1) and 40% (with frequency 1:4) of that of the cylindrical IAB, when angle increased from 0 to 40°. During inflation Shape 1 displayed a more stable behavior with increasing angle compared to the cylindrical IAB; with an increase in angle from 0 to 40°, diastolic aortic pressure augmentation dropped only by 45% (with frequency 1:1) and by 33% (with frequency 1:4) of the drop reached with the cylindrical IAB. After compensating for differences in nominal IAB volume, Shape 1 generally achieved higher P aug over most angles. Newly shaped IABs could allow for IABP therapy to become more efficient for patients nursed at the semirecumbent position. The findings promote the idea of personalized rather than generalized patient therapy for the achievement of higher IABP therapeutic efficiency

  12. CT volumetry of intravertebral cement after kyphoplasty. Comparison of polymethylmethacrylate and calcium phosphate in a 12-month follow-up

    Energy Technology Data Exchange (ETDEWEB)

    Libicher, M.; Noeldge, G.; Kauffmann, G.W. [University of Heidelberg, Department of Diagnostic Radiology, Heidelberg (Germany); Vetter, M.; Wolf, I.; Meinzer, H.P. [Deutsches Krebsforschungszentrum, Departments of Medical and Biological Informatics, Heidelberg (Germany); Kasperk, C.; Grafe, I. [University of Heidelberg, Department of Internal Medicine, Heidelberg (Germany); Fonseca, K.D.; Meeder, P.J. [University of Heidelberg, Department of Trauma Surgery, Heidelberg (Germany); Hillmeier, J. [St. Vincenz Hospital, Department of Trauma Surgery, Limburg (Germany)

    2005-08-01

    This study was intended to measure the volume of intravertebral cement after balloon kyphoplasty with high resolution computed tomography (CT) and dedicated software. Volume changes of biocompatible calcium phosphate cement (CPC) were detected during a follow-up of 12 months. Measurements were compared with a control group of patients treated with polymethylmethacrylate (PMMA). Twenty-three vertebrae (14 CPC, 9 PMMA) of 12 patients were examined with CT using an identical imaging protocol. Dedicated software was used to quantify intravertebral cement volume in subvoxel resolution by analyzing each cement implant with a density-weighted algorithm. The mean volume reduction of CPC was 0.08 ml after 12 months, which corresponds to an absorption rate of 2 vol%. However, the difference did not reach significance level (P>0.05). The mean error estimate was 0.005 ml, indicating excellent precision of the method. CT volumetry appears a precise tool for measurement of intravertebral cement volume. CT volumetry offers the possibility of in vivo measurement of CPC resorption. (orig.)

  13. 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.

  14. 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.

  15. Complications following kyphoplasty in unstable osteoporotic vertebral body fractures. A guide to correct fracture analysis.

    Science.gov (United States)

    Trouillier, Hans-Heinrich; Birkenmaier, Christof; Seidl, Tamara; Jansson, Volkmar

    2013-10-01

    The possibilities offered by kyphoplasty in the treatment of osteoporotic vertebral fractures have been widely described. Kyphoplasty is technically not very demanding, it can be easily learned and it is minimally invasive when compared to open surgical fracture treatment. Like many other simple surgical methods, it has spread rapidly and as a consequence of the above factors combined with its good reimbursement in many countries, it has experienced a widening in the indications for which it is being employed. The intial purpose of kyphoplasty was pain relief based on vertebral body stabilisation combined with restoration of vertebral body height. An increasingly uncritical use of the method can be observed and as a consequence, an increase in serious complications. During recent years, spinal surgery departments have received an increasing number of patients with serious complications following kyphoplasty, requiring major reconstructive spinal surgery. On the basis of 12 cases treated over the past 36 months, we aim to provide guidelines for the indications of the kyphoplasty procedure.

  16. The value of routine biopsy during percutaneous kyphoplasty for vertebral compression fractures.

    Directory of Open Access Journals (Sweden)

    Qiang Li

    Full Text Available Percutaneous kyphoplasty (PKP is now widely performed to treat VCF, which is usually caused by osteoporosis. Previous researches have reported unsuspected malignancies found by biopsy. However, the safety and cost-effective profiles of routine biopsy during PKP are unclear. The purpose of this study was to evaluate the feasibility of routine biopsy during PKP in treatment of VCF.Ninety-three patients (September 2007-November 2010 undergoing PKP without biopsy were reviewed as the control group. One hundred and three consecutive patients (November 2010-September 2013 undergoing PKP with biopsy of every operated vertebral level were prospectively enrolled as the biopsy group. The rate of unsuspected lesions was reported, and the severe adverse events, surgical duration, cement leakage rate and pain control were compared between the two groups.No statistically significant differences were found between the two groups, regarding the severe adverse events, surgical duration, cement leakage rate and pain control. Four unsuspected lesions were found in the biopsy group, three of which were malignancies with a 2.9% (3/103 unsuspected malignancy rate. The economic analysis showed that routine biopsy was cost-effective in finding new malignancies comparing with a routine cancer screening campaign.Routine biopsy during PKP was safe and cost-effective in finding unsuspected malignancies. We advocate routine biopsy in every operated vertebral level during PKP for VCF patients.

  17. GHOST balloons around Antarctica

    Science.gov (United States)

    Stearns, Charles R.

    1988-01-01

    The GHOST balloon position as a function of time data shows that the atmospheric circulation around the Antarctic Continent at the 100 mb and 200 mb levels is complex. The GHOST balloons supposedly follow the horizontal trajectory of the air at the balloon level. The position of GHOST balloon 98Q for a three month period in 1968 is shown. The balloon moved to within 2 deg of the South Pole on 1 October 1968 and then by 9 December 1968 was 35 deg from the South Pole and close to its position on 1 September 1968. The balloon generally moved from west to east but on two occasions moved in the opposite direction for a few days. The latitude of GHOST balloons 98Q and 149Z which was at 200 mb is given. Both balloons tended to get closer to the South Pole in September and October. Other GHOST balloons at the same pressure and time period may not indicate similar behavior.

  18. 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

  19. Controversial Issues in Kyphoplasty and Vertebroplasty in Osteoporotic Vertebral Fractures

    Directory of Open Access Journals (Sweden)

    Ioannis D. Papanastassiou

    2014-01-01

    Full Text Available Kyphoplasty (KP and vertebroplasty (VP have been successfully employed for many years for the treatment of osteoporotic vertebral fractures. The purpose of this review is to resolve the controversial issues raised by the two randomized trials that claimed no difference between VP and SHAM procedure. In particular we compare nonsurgical management (NSM and KP and VP, in terms of clinical parameters (pain, disability, quality of life, and new fractures, cost-effectiveness, radiological variables (kyphosis correction and vertebral height restoration, and VP versus KP for cement extravasation and complications profile. Cement types and optimal filling are analyzed and technological innovations are presented. Finally unipedicular/bipedicular techniques are compared. Conclusion. VP and KP are superior to NSM in clinical and radiological parameters and probably more cost-effective. KP is superior to VP in sagittal balance improvement and cement leaking. Complications are rare but serious adverse events have been described, so caution should be exerted. Unilateral procedures should be pursued whenever feasible. Upcoming randomized trials (CEEP, OSTEO-6, STIC-2, and VERTOS IV will provide the missing link.

  20. A balloon-borne integrating nephelometer

    Energy Technology Data Exchange (ETDEWEB)

    Brown, G.S.; Apple, M.L. (Sandia National Labs., Albuquerque, NM (USA)); Weiss, R.E. (Radiance Research, Seattle, WA (USA))

    1990-09-01

    A balloon-borne integrating nephelometer has been successfully developed and flown by Sandia National Laboratories and Radiance Research. This report details instrument design, calibration and data conversion procedure. Free and tethered balloon transport and telemetry systems are described. Data taken during March 1989 South-Central New Mexico free flight ascents are presented as vertical profiles of atmospheric particle scattering coefficient, temperature and balloon heading. Data taken during December 1989 Albuquerque, New Mexico tethered flights are also presented as vertical profiles. Data analysis shows superior instrument performance. 5 refs., 22 figs.

  1. 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.

  2. Cause Analysis of Open Surgery Used After Percutaneous Vertebroplasty and Kyphoplasty

    Science.gov (United States)

    Xu, Zhengwei; Hao, Dingjun; Liu, Tuanjiang; He, Baorong; Guo, Hua; He, Limin

    2016-01-01

    Background The aim of this study was to analyze reasons why open surgery was done after percutaneous vertebroplasty and kyphoplasty. Material/Methods Patients (587 vertebral bodies) treated with percutaneous vertebroplasty or kyphoplasty in the Xi’an Honghui Hospital of Shanxi Province from January 2008 to January 2012 were retrospectively analyzed and 13 patients were enrolled in the study. These 13 patients had serious adverse events after percutaneous vertebroplasty or kyphoplasty. Their average age was 64.5 years old. Nine patients had spinal cord injury and 4 had nerve root injury. All the patients underwent open surgery within 4–12 h after definitive diagnosis. Results All 13 cases were followed up (average time 14.1 months, range 3–47 months). Reasons for open surgery included cement extravasation (6 cases, 46.2%), puncture mistake (3 cases, 23.1%), and false selection of indications (4 cases, 30.8%). At last follow-up, skin feeling was better than that before open surgery in 4 cases with nerve root injury, and muscle strength recovered to grade 5 (3 cases) and grade 4 (1 case). In 9 cases with spinal cord injury, 7 patients improved and 2 remained at the same ASIA level. Conclusions The main reasons for open surgery after percutaneous vertebroplasty and kyphoplasty were cement extravasation (the most common reason), puncture mistake, and false selection of indications. PMID:27444135

  3. Anatomical and pathological considerations in percutaneous vertebroplasty and kyphoplasty : A reappraisal of the vertebral venous system

    NARCIS (Netherlands)

    Groen, RJM; du Toit, DF; Phillips, FM; Hoogland, PVJM; Kuizenga, K; Coppes, MH; Muller, CJF; Grobbelaar, M; Mattyssen, J

    2004-01-01

    Objectives. To focus attention of the clinician on the anatomy and (patho) physiology of the vertebral venous system, so as to offer a tool to better understand and anticipate ( potential) complications that are related to the application of percutaneous vertebroplasty and kyphoplasty. Background. P

  4. Intracardiac Leakage of Cement During Kyphoplasty and Vertebroplasty: A Case Report

    Science.gov (United States)

    Audat, Ziad A.; Alfawareh, Mohammad D.; Darwish, Fayeq T.; Alomari, Ali A.

    2016-01-01

    Patient: Male, 28 Final Diagnosis: Intracardial cortoss leak Symptoms: Back pain Medication: — Clinical Procedure: Kyphoplasty Specialty: Orthopedics and Traumatology Objective: Diagnostic/therapeutic accidents Background: Intracardiac leakage of bone cement after kyphoplasty and vertebroplasty is a rare and life-threatening complication. Cortoss, which is an injectable, non-absorbable, polymer composite that is designed to mimic cortical bone, can be used instead of cement. Here, we present the case of a patient with right intra-cardiac Cortoss embolization. Case Report: A 28-year-old man known to have ulcerative colitis since the age of 15 and treated with corticosteroids for more than 4 years and with anti-immune drugs presented to our hospital complaining of back pain and decreased body height due to osteomalacia with failed conservative treatment. Kyphoplasty and vertebroplasty of the thoracic 10–12 and first lumbar vertebrae were done with any complications. Three months later, the patient underwent kyphoplasty and vertebroplasty of lumbar 2–5 vertebrae by injecting Cortoss instead of cement, which was complicated with paravertebral intravascular leakage. We stopped surgery and transferred him to the recovery room, where he had slight chest pain that resolved spontaneously without neurological deficit. Two days later he developed severe chest pain and chest X-ray showed a large white shadow at the right side of the heart and another 2 small shadows just lateral to it. Sudden deterioration of patient status necessitated an emergency echocardiogram, which showed pericardial tamponade and a perforated right ventricle. Aspiration of pericardial blood and emergency open heart surgery were done. He was discharged 4 days later and was followed up at an outpatient clinic. Conclusions: Cardiac embolism is a serious condition that can complicate vertebral kyphoplasty; it requires a high level of suspicion and immediate action, and may need open heart surgery to

  5. 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.

  6. The assessment of risky decision making: a factor analysis of performance on the Iowa Gambling Task, Balloon Analogue Risk Task, and Columbia Card Task.

    Science.gov (United States)

    Buelow, Melissa T; Blaine, Amber L

    2015-09-01

    Researchers and clinicians frequently use behavioral measures to assess decision making. The most common task that is marketed to clinicians is the Iowa Gambling Task (IGT), thought to assess risky decision making. How does performance on the IGT relate to performance on other common measures of decision making? The present study sought to examine relationships between the IGT, the Balloon Analogue Risk Task (BART), and the Columbia Card Task (CCT). Participants were 390 undergraduate students who completed the IGT, BART, and either the "hot" or "cold" CCT. Principal components factor analysis on the IGT, BART, and CCT-cold (n = 112) indicated that the IGT measures a different component of decision making than the BART, and the CCT-cold weakly correlated with early IGT trials. Results of the exploratory factor analysis on the IGT, BART, and CCT-hot (n = 108) revealed a similar picture: the IGT and BART assessed different types of decision making, and the BART and CCT-hot were weakly correlated. A confirmatory factor analysis (n = 170) indicated that a 3-factor model without the CCT-cold (Factor 1: later IGT trials; Factor 2: BART; and Factor 3: early IGT trials) was a better fitting model than one that included the CCT-cold and early IGT trials on the same factor. Collectively, the present results suggest that the IGT, BART, and CCT all measure unique, nonoverlapping decision making processes. Further research is needed to more fully understand the neuropsychological construct of decision making.

  7. 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.)

  8. 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.

  9. Jack vertebral dilator kyphoplasty for treatment of osteoporotic vertebral compression fractures.

    Science.gov (United States)

    Li, Dapeng; Huang, Yonghui; Yang, Huilin; Chen, Qi; Sun, Taicun; Wu, Yan; Li, Xuefeng

    2014-01-01

    Osteoporotic vertebral compression fractures (OVCFs) are common in the elderly population and often involve the thoracolumbar vertebrae. Clinical symptoms of OVCFs include severe pain, loss of vertebral height, progressive kyphosis and increased mortality. Jack vertebral dilator kyphoplasty is a recently developed OVCFs treatment modality, with few systematic studies present in the literature. This retrospective study was designed to investigate the safety and efficacy of Jack vertebral dilator kyphoplasty for treating thoracolumbar OVCFs. Sixteen elderly patients (55-85 years) with solitary thoracolumbar OVCFs were treated with this procedure and followed-up (10-27 months). The amount of injected bone cement and operative time, preoperative and postoperative visual analogue scores, anterior and middle vertebral body heights, local kyphosis angle, and complications was analysed. The results showed that the method provided long-term pain relief and restoration of the vertebral body height and spinal alignment. No serious complications occurred, but two patients experienced recompression of the vertebral body, and one patient experienced cement leakage into a disc. In conclusion, Jack vertebral dilator kyphoplasty is a safe and effective minimally invasive procedure for treatment of OVCFs.

  10. Development of a balloon volume sensor for pulsating balloon catheters.

    Science.gov (United States)

    Nolan, Timothy D C; Hattler, Brack G; Federspiel, William J

    2004-01-01

    Helium pulsed balloons are integral components of several cardiovascular devices, including intraaortic balloon pumps (IABP) and a novel intravenous respiratory support catheter. Effective use of these devices clinically requires full inflation and deflation of the balloon, and improper operating conditions that lead to balloon under-inflation can potentially reduce respiratory or cardiac support provided to the patient. The goal of the present study was to extend basic spirographic techniques to develop a system to dynamically measure balloon volumes suitable for use in rapidly pulsating balloon catheters. The dynamic balloon volume sensor system (DBVSS) developed here used hot wire anemometry to measure helium flow in the drive line from console to catheter and integrated the flow to determine the volume delivered in each balloon pulsation. An important component of the DBVSS was an algorithm to automatically detect and adjust flow signals and measured balloon volumes in the presence of gas composition changes that arise from helium leaks occurring in these systems. The DBVSS was capable of measuring balloon volumes within 5-10% of actual balloon volumes over a broad range of operating conditions relevant to IABP and the respiratory support catheter. This includes variations in helium concentration from 70-100%, pulsation frequencies from 120-480 beats per minute, and simulated clinical conditions of reduced balloon filling caused by constricted vessels, increased driveline, or catheter resistance.

  11. 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...

  12. Vertebroplasty and kyphoplasty for cervical spine metastases: a systematic review and meta-analysis

    Science.gov (United States)

    De la Garza-Ramos, Rafael; Benvenutti-Regato, Mario

    2016-01-01

    Background Vertebroplasty (VP) and kyphoplasty (KP) are two minimally invasive techniques used to relieve pain and restore stability in metastatic spinal disease. However, most of these procedures are performed in the thoracolumbar spine, and there is limited data on outcomes after VP/KP for cervical metastases. The purpose of this article is to evaluate the safety and efficacy of VP and KP for treating pain in patients with cervical spine metastases. Methods A systematic review of the literature was conducted using the PubMed and Medline databases. Only studies that reported five or more patients treated with VP/KP in the cervical spine were included. Levels of evidence and grades of recommendation were established based on the Oxford Centre for Evidence-Based Medicine guidelines. Data was pooled to perform a meta-analysis for pain relief and complication rates. Results Six studies (all level 4 studies) met the inclusion criteria, representing 120 patients undergoing VP/KP at 135 vertebrae; the most common addressed level was C2 in 83 cases. The average volume of injected cement was 2.5 ± 0.5 milliliters at each vertebra. There were 22 asymptomatic cement leaks (16%; 95% CI, 9.8% - 22.2%) most commonly occurring in the paraspinal soft tissue. There were 5 complications (4%; 95% CI, 0.5% - 7.5%): 3 cases of mild odynophagia, 1 case of occipital neuralgia secondary to leak, and 1 case of stroke secondary to cement embolism. Pain relief was achieved in 89% of cases (range: 80 - 100%). The calculated average pain score decreased significantly from 7.6 ± 0.9 before surgery to 1.9 ± 0.8 at last evaluation (p=0.006). Conclusion Although the calculated complication rate after VP/KP in the cervical spine is low (4%) and the reported pain relief rate is approximately 89%, there is lack of high-quality evidence supporting this. Future randomized controlled trials are needed. PMID:26913227

  13. Development of a super-pressure balloon with a diamond-shaped net --- result of a ground inflation test of a 2,000 cubic-meter balloon ---

    Science.gov (United States)

    Saito, Yoshitaka; Nakashino, Kyoichi; Akita, Daisuke; Matsushima, Kiyoho; Shimadu, Shigeyuki; Goto, Ken; Hashimoto, Hiroyuki; Matsuo, Takuma

    2016-07-01

    A light super-pressure balloon has been developed using a method to cover a balloon with a diamond-shaped net of high-tensile fibers. The goal is to fly a payload of 900 kg to the altitude of 37 km with a 300,000 m^{3} balloon. Beginning from a demonstration test of the net-balloon with a 10 m^{3} balloon in 2010, we have been polished the net-balloon through ground inflation tests and flight tests, including a flight test of a 3,000 m ^{3} balloon in the tandem balloon configuration with a 15,000 m^{3} zero-pressure balloon in 2012, and a flight test of a 10 m^{3} balloon in the tandem balloon configuration with a 2 kg rubber balloon in 2013, as reported in the last COSPAR. In 2014, we developed a 5,000 m^{3} balloon and performed a ground inflation test to find that the balloon burst from a lip panel for termination with a differential pressure of 425 Pa. It was due to a stress concentration at the edge of a thick tape attached along the termination mechanism. In 2015, we modified the balloon by adding tapes on the lip panel to avoid the stress concentration, and also shorten the net length to leave some margin of the film and performed a ground inflation test again to find the balloon showed asymmetrical deployment and burst from the edge of the net with a differential pressure of 348 Pa. We consider it is due to the margin of the film along the circumferential direction, and proposed a gore shape which circumference length is kept as determined by the pumpkin shape of the balloon but setting meridian length longer than that. We developed a 10 m^{3} balloon with the gore design to find that the balloon deployed symmetrically and showed the burst pressure of 10,000 Pa. In 2016, we are going to develop a 2,000 m^{3} balloon with the gore design and perform its ground inflation test. In this paper, we are going to report its result with the sequence of the development.

  14. Intragastric balloon and multidisciplinary team

    Directory of Open Access Journals (Sweden)

    R. A. Mazure

    Full Text Available Background: The intragastric balloon is widely used for weight reduction in obese patients, but results are variable. We describe our results enhancing the importance of a Multidisciplinary Team (MT taking part in the treatment. Methods: A retrospective review was done concerning a total of 119 balloons , placed in 116 patients, under endoscopic control and conscious sedation, from May 2001 until August 2006. 49 patients were prepared and recommended to be followed by a MT in a physical unit, at least every 15 days during 6 months. 67 were indicated and followed by other colleagues, without MT. Removal was performed 6 months later. Results: Concerning our 49 patients, mean age was 38, 1 years, 31 female and 18 males, with BMI ranged between 32 and 63, average of 42. The average decrease of weight excess was 31, 85% (-4, 45-80, 4%, and the BMI diminished 5,3 points (from 13,6 to gain of 0,9. The treatment failed in 34,6 % of our patients -including 4 patients lost of follow-up (8, 16%-, compared with 53, 8% of patients without structured MT for selection and follow-up. Physical exercise enhanced markedly the results with 45, 8% of excess of weight loss in women and 39, 7% in males, compared with 14, 6 and 15, 6% in patients who didn't follow the program. The weight loss was mostly fat mass, 89,9% in men and 75,6% in women.- The results maintenance was obtained in 40% of patients one year later. There were no major complications; one balloon had to be removed at 3 weeks because of intolerance, another at 5 months because of gastroesophageal reflux. Conclusions: BIB is an effective help to achieve a short term weight loss in obese patients; nevertheless, good and long lasting results will depend on the modification of life style obtained by a multidisciplinary approach.

  15. Flight Qualification of the NASA's Super Pressure Balloon

    Science.gov (United States)

    Cathey, Henry; Said, Magdi; Fairbrother, Debora

    Designs of new balloons to support space science require a number of actual flights under various flight conditions to qualify them to as standard balloon flight offerings to the science community. Development of the new Super Pressure Balloon for the National Aeronautics and Space Administration’s Balloon Program Office has entailed employing new design, analysis, and production techniques to advance the state of the art. Some of these advances have been evolutionary steps and some have been revolutionary steps requiring a maturing understanding of the materials, designs, and manufacturing approaches. The NASA Super Pressure Balloon development end goal is to produce a flight vehicle that is qualified to carry a ton of science instrumentation, at an altitude greater than 33 km while maintaining a near constant pressure altitude for extended periods of up to 100 days, and at any latitude on the globe. The NASA’s Balloon Program Office has pursued this development in a carefully executed incremental approach by gradually increasing payload carrying capability and increasing balloon volume to reach these end goal. A very successful test flight of a ~200,700 m3 balloon was launch in late 2008 from Antarctica. This balloon flew for over 54 days at a constant altitude and circled the Antarctic continent almost three times. A larger balloon was flown from Antarctica in early 2011. This ~422,400 m3 flew at a constant altitude for 22 days making one circuit around Antarctica. Although the performance was nominal, the flight was terminated via command to recover high valued assets from the payload. The balloon designed to reach the program goals is a ~532,200 m3 pumpkin shaped Super Pressure Balloon. A test flight of this balloon was launched from the Swedish Space Corporation’s Esrange Balloon Launch Facilities near Kiruna, Sweden on 14 August, 2012. This flight was another success for this development program. Valuable information was gained from this short test

  16. A Rare and Serious Unforeseen Complication of Cutting Balloon Angioplasty

    Directory of Open Access Journals (Sweden)

    Praveen Vemula

    2014-01-01

    Full Text Available Cutting balloon angioplasty (CBA is one of the adept ways of treating “in-stent restenosis.” Various complications related to cutting balloon angioplasty have been reported including arterial rupture, delayed perforation and fracture of microsurgical blades. Here we report a very unusual and inadvertent extraction of a stent previously deployed in the ramus intermedius coronary branch by a cutting balloon catheter. This required repeat stenting of the same site for an underlying dissection. Even though stent extraction is a rare complication it can be serious due to dissection, perforation, and closure of the artery. Physicians performing coronary artery interventions would need to be aware of this rare and serious complication especially if any difficulty is encountered while withdrawing the cutting balloon. Therefore, after removal, cutting balloon should be examined thoroughly for possible stent dislodgment or extraction when used for “in-stent restenosis.”

  17. An overview of instrumentation capabilities for Scientific ballooning in India

    Science.gov (United States)

    Devarajan, Anand; Reddy Vizapur, Anmi; Rao Tanneeru, Venkateswara; Bangaru, Kapardhi; Trivedi, Dharmesh; Rodi, Ashish; Ojha, Devendra; Koli, Santosh

    2016-07-01

    The Balloon Facility of Tata Institute of Fundamental Research (TIFR-BF) in India, launches scientific balloons for research in the field of astronomy, astrobiology and atmospheric sciences. TIFR-BF not only has the capability to design, fabricate and launch zero-pressure balloons, but also provide operational and engineering support for launching them. The Control Instrumentation Group (CIG) at the balloon facility handles all electronics related to telemetry, telecommand, tracking, real-time data display, data storage, air-safety and payload recovery. In the recent past, it has designed and developed customized electronics and payload orientation mechanism to meet specific experimental objectives. Small, inexpensive and rugged industrial grade radio data modems were successfully deployed in balloon flights for low bit rate data and image telemetry. This paper will provide an overview and in-flight performance of some of the recent developments in instrumentation and electronics systems. Our plans for future upgradations will also be discussed.

  18. Space Weather Ballooning

    Science.gov (United States)

    Phillips, Tony; Johnson, Sam; Koske-Phillips, Amelia; White, Michael; Yarborough, Amelia; Lamb, Aaron; Herbst, Anna; Molina, Ferris; Gilpin, Justin; Grah, Olivia; Perez, Ginger; Reid, Carson; Harvey, Joey; Schultz, Jamie

    2016-10-01

    We have developed a "Space Weather Buoy" for measuring upper atmospheric radiation from cosmic rays and solar storms. The Buoy, which is carried to the stratosphere by helium balloons, is relatively inexpensive and uses off-the-shelf technology accessible to small colleges and high schools. Using this device, we have measured two Forbush Decreases and a small surge in atmospheric radiation during the St. Patrick's Day geomagnetic storm of March 2015.

  19. Obesity and gastric balloon

    Directory of Open Access Journals (Sweden)

    Mohammed I Yasawy

    2014-01-01

    Full Text Available Background: The obesity epidemic, which is among the most common nutritional disorders, is rising rapidly worldwide. It leads to several health problems such as metabolic disorders, stroke, and even cancer. Efforts to control obesity with exercise and diet have a limited value in obese patients and different approaches to do this have been tried. In this paper, we share our experience with bioenteric intragastric balloon (BIB in treating obesity: Its safety, tolerability, and its efficacy in weight reduction. Materials and Methods: From January 2009 to September 2012, a total of 190 gastric balloons was inserted on patients at the endoscopy unit in King Fahd Hospital of the University, Al-Khobar. This is an evaluation of the first 100 patients. All the patients had a body mass index of over 30 kg/m 2 and were within the age range of 17-55 with a mean age of 32 years. After consent, preballoon investigation tests and anesthesia evaluation, BIB was inserted under monitored anesthesia care sedation in the endoscopy suite. The balloon was filled with 500-700 mls of stained saline. All patients′ were given an analgesic and antiemetic for a week and antisecretory proton pump inhibitor′s for 6 months. Diet and the importance of the exercise were part of the preballoon insertion phase and protocol. The balloon was removed after 6-12 months. Results: The weight loss response to BIB in the 100 patients are classified into four groups: In the uncooperative, noncompliant patients - the maximum weight loss was 7 kg, while in the most compliant patients the weight loss reached up to 39 kg. In addition, there was significant improvement into diabetes mellitus, hypertension, dyslipidemia, and fatty liveras. Its safety and tolerability were extremely acceptable. Conclusion: Our data indicates that in well-selected patients, BIB is an effective device, which with minimum complications helps to achieve body weight loss and resolve many obesity related

  20. Patient variables and referral paradigms associated with osteoporosis screening and treatment in neurosurgical patients undergoing kyphoplasty.

    Science.gov (United States)

    Morr, Simon; Shakir, Hakeem J; Lipinski, Lindsay J; Dimopoulos, Vassilios G; Leonardo, Jody; Pollina, John

    2015-12-01

    OBJECT Vertebral fractures are the most common osteoporotic fracture. Bone density testing and medical treatment with bisphosphonates or parathormone are recommended for all patients with an osteoporotic fracture diagnosis. Inadequate testing and treatment of patients presenting with low-impact fractures have been reported in various specialties. Similar data are not available from academic neurosurgery groups. The authors assessed compliance with treatment and testing of osteoporosis in patients with vertebral compression fractures evaluated by the authors' academic neurosurgery service, and patient variable and health-systems factors associated with improved compliance. METHODS Data for patients who underwent percutaneous kyphoplasty for compression fractures was retrospectively collected. Diagnostic and medical interventions were tabulated. Pre-, intra-, and posthospital factors that had been theorized to affect the compliance of patients with osteoporosis-related therapies were tabulated and statistically analyzed. RESULTS Less than 50% of patients with kyphoplasty received such therapies. Age was not found to correlate with other variables. Referral from a specialist rather than a primary care physician was associated with a higher rate of bone density screening, as well as vitamin D and calcium therapy, but not bisphosphonate/parathormone therapy. Patients who underwent preoperative evaluation by their primary care physician were significantly more likely to receive bisphosphonates compared with those only evaluated by a hospitalist. Patients with unprovoked fractures were more likely to undergo multiple surgeries compared with those with minor trauma. CONCLUSIONS These results suggest poor compliance with current standard of care for medical therapies in patients with osteoporotic compression fractures undergoing kyphoplasty under the care of an academic neurosurgery service.

  1. CT-guided vertebroplasty and kyphoplasty: comparing technical success rate and complications in 101 cases; CT-gesteuerte Vertebro- und Kyphoplastie: Vergleichende Untersuchung zu technischem Erfolg und Komplikationen bei 101 Eingriffen

    Energy Technology Data Exchange (ETDEWEB)

    Weber, C.H.; Kroetz, M.; Hoffmann, R.T.; Pfeifer, K.J.; Reiser, M.; Linsenmaier, U. [Inst. fuer Klinische Radiologie, LMU Muenchen (Germany); Euler, E.; Heining, S. [Chirurgische Klinik und Poliklinik, LMU Muenchen (Germany)

    2006-06-15

    Purpose: to compare the technical success and complication rates in CT-guided vertebroplasty and kyphoplasty. Materials and methods: from 2002 - 2005 69 patients (101 vertebrae) were treated with vertebroplasty (n = 82) or kyphoplasty (n = 19) using 4-slice MSCT with CT fluoroscopy as the sole guidance for the procedure. The underlying lesions were osteoporotic fractures in 78 vertebral bodies and 23 vertebral metastases. Results: technical success was achieved in all 101 procedures. Post-interventional CT demonstrated asymptomatic cement leakage in 51/101 vertebrae. Kyphoplasty resulted in leakage in 11/19 (57.9%) and vertebroplasty in 40/82 (48.8%) procedures. With p = 0.48 (Mann-Whitney test) there was no significant difference between kyphoplasty and vertebroplasty with respect to the number of cement leakage occurrences. There was one minor complication of an L5 root irritation following radiofrequency ablation and vertebroplasty of a sarcoma metastasis which subsided without treatment after 8 weeks. There was one major complication of intraspinal cement leakage during tumor vertebroplasty causing T5 root compression and requiring laminectomy for cement removal. The overall rate of major complications requiring treatment was 0.99%. (orig.)

  2. 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.

  3. Breakthrough in Mars balloon technology

    Science.gov (United States)

    Kerzhanovich, V. V.; Cutts, J. A.; Cooper, H. W.; Hall, J. L.; McDonald, B. A.; Pauken, M. T.; White, C. V.; Yavrouian, A. H.; Castano, A.; Cathey, H. M.; Fairbrother, D. A.; Smith, I. S.; Shreves, C. M.; Lachenmeier, T.; Rainwater, E.; Smith, M.

    2004-01-01

    Two prototypes of Mars superpressure balloons were flight tested for aerial deployment and inflation in the Earth's stratosphere in June, 2002. One was an 11.3 m diameter by 6.8 m high pumpkin balloon constructed from polyethylene film and Zylon (PBO) tendons, the second was a 10 m diameter spherical balloon constructed from 12 μm thick Mylar film. Aerial deployment and inflation occurred under parachute descent at 34 km altitude, mimicing the dynamic pressure environment expected during an actual Mars balloon mission. Two on-board video cameras were used on each flight to provide real-time upward and downward views of the flight train. Atmospheric pressure and temperature were also recorded. Both prototypes successfully deployed from their storage container during parachute descent at approximately 40 m/s. The pumpkin balloon also successfully inflated with a 440 g charge of helium gas injected over a 1.5-min period. Since the helium inflation system was deliberately retained after inflation in this test, the pumpkin balloon continued to fall to the ocean where it was recovered for post-flight analysis. The less robust spherical balloon achieved only a partial (~70%) inflation before a structural failure occurred in the balloon film resulting in the loss of the vehicle. This structural failure was diagnosed to result from the vigorous oscillatory motion of the partially inflated balloon, possibly compounded by contact between the balloon film and an instrumentation box above it on the flight train. These two flights together represent significant progress in the development of Mars superpressure balloon technology and pave the way for future flight tests that will include post-deployment flight of the prototype balloons at a stable altitude.

  4. Clinical analysis of percutaneous kyphoplasty for osteoporotic vertebral compression fracture%椎体后凸成形术治疗骨质疏松椎体压缩性骨折疗效分析

    Institute of Scientific and Technical Information of China (English)

    周毅; 海涌; 苏庆军; 杨晋才; 康南; 孟祥龙

    2012-01-01

    spinal canal involved situation on image. The levels of fracture ranged from T8 to L3, mostly at thoracolumbar levels from T10 to L2. The Visual Analog Scale ( VAS), Oswestry Dysfunction Index (ODI), and radiographic results were evaluated at different time point of before and after the operation. Results All patients were treated with balloon kyphoplasty via uni-pedicular approach and were followed up for 6-14 months (9. 6 months in average) successfully. The average operation time was 33 minutes and average volume of PMMA cement was 4. 2 ml. After kyphoplasty, VAS improved from 7. 86 ± 0. 86 to 2. 82 ± 0. 98 (P < 0. 01) and ODI improved from 79. 0417. 67 to 28. 35 ± 5. 80 (P < 0.01). The height of anterior and middle edge of the vertebrae increased from 68. 72 ± 5.48% and 72.92 ± 4. 82% to 84.04 ±5. 05% and 87.96 ±4.38% , respectively. The mean kyphosis was improved from 23. 52 ±3. 87 to 11.36 ±2.37 degree (P<0. 05). There was significant difference between pre- and post-operation, and there was no difference between different time point of post-operation and late follow-up time. Conclusion Balloon kyphoplasty via uni-pedicular approach is a reliable and effective method for osteoporotic vertebral compression fracture. It can not only relieve pain and improve function rapidly, but also restore the vertebral anterior column height and correct kyphosis deformity.

  5. Titan Balloon Convection Model Project

    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...

  6. Fraturas vertebrais adjacentes: cifoplastia versus vertebroplastia Fracturas vertebrales adyacentes: cifoplastía vs vertebroplastía Adjacent vertebral fractures: kyphoplasty versus vertebroplasty

    Directory of Open Access Journals (Sweden)

    Luis Cláudio Schettino

    2011-01-01

    pacientes fueron divididos en dos grupos diferentes: Vertebroplastía (V y Cifoplastía (C, de acuerdo con el procedimiento realizado. Se comparó, entre los dos grupos, la altura de los cuerpos vertebrales y la cifosis angular, antes y después de cada procedimiento, y fueron correlacionadas con la incidencia de fracturas vertebrales adyacentes. El análisis estadístico fue hecho por las pruebas chi-cuadrado, t de Student y ANOVA de 2 factores seguida por prueba post-hoc de Bonferroni. RESULTADOS: Fueron analizadas las historias médicas de 55 pacientes. Diez pacientes fueron excluidos del estudio. Veintiséis pacientes realizaron vertebroplastía y diecinueve pacientes hicieron cifoplastía. Fue observada reducción de la cifosis angular promedio, en los pacientes del grupo C, de 1,81 grados cuando se compararon con los pacientes del grupo V. No hubo diferencia estadística entre los dos grupos cuanto a la altura promedio del cuerpo vertebral pre y posoperatoria. Tres pacientes del grupo V y dos pacientes del grupo C presentaron fractura vertebral adyacente. Los dos pacientes, con fracturas adyacentes del grupo C, estaban en uso de corticosteroides. Los tres pacientes del grupo V, con fracturas adyacentes, presentaron extravación de cemento. CONCLUSIÓN: No hubo diferencia en la incidencia de fracturas vertebrales adyacentes entre los dos grupos.OBJECTIVE: To compare the incidence of adjacent vertebral fractures between vertebroplasty and kyphoplasty. METHODS: We reviewed medical records and radiographs pre and postoperatively from January 2002 to January 2009. The minimal follow-up time was three months. The patients were divided in two distinct groups: vertebroplasty (V and kyphoplasty (K group, according to the procedure performed. The vertebral body height and the angular kyphosis before and after each procedure were compared between these two groups and correlated to the incidence of adjacent vertebral fractures. RESULTS: We analyzed 55 medical records. Ten

  7. Double balloon enteroscopy examinations in general anesthesia

    Institute of Scientific and Technical Information of China (English)

    Laszlo; Zubek; Lena; Szabo; Peter; Laszlo; Lakatos; Janos; Papp; Janos; Gal; Gabor; Elo

    2010-01-01

    AIM:To demonstrate that the double balloon enteroscopy(DBE) can be safely performed in general anesthesia with intubation.METHODS:We performed a retrospective examination between August 2005 and November 2008 amongpatients receiving intubation narcosis due to DBE examination.The patients were grouped based on sex,age and physical status.Anesthesia records includedduration of anesthesia,quantity of medication usedand anesthesia-related complications.We determinedthe frequency of complications in the differen...

  8. An investigation of electrostatically deposited radionuclides on latex balloons

    Energy Technology Data Exchange (ETDEWEB)

    Price, T.; Caly, A., E-mail: Terry.Price@gmail.com [Univ. of Ontario Inst. of Technology, Oshawa, Ontario (Canada)

    2012-07-01

    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)

  9. Flight Performance of an advanced CZT Imaging Detector in a Balloon-borne Wide-Field Hard X-ray Telescope - ProtoEXIST1

    CERN Document Server

    Hong, J; Grindlay, J; Barthelemy, S; Baker, R; Garson, A; Krawczynski, H; Apple, J; Cleveland, W H

    2011-01-01

    We successfully carried out the first high-altitude balloon flight of a wide-field hard X-ray coded-aperture telescope ProtoEXIST1, which was launched from the Columbia Scientific Balloon Facility at Ft. Sumner, New Mexico on October 9, 2009. ProtoEXIST1 is the first implementation of an advanced CdZnTe (CZT) imaging detector in our ongoing program to establish the technology required for next generation wide-field hard X-ray telescopes. The CZT detector plane in ProtoEXIST1 consists of an 8 x 8 array of closely tiled 2 cm x 2 cm x 0.5 cm thick pixellated CZT crystals, each with 8 x 8 pixels, covering a 256 cm^2 active area with 2.5 mm pixels. A tungsten mask, mounted at 90 cm above the detector provides shadowgrams of X-ray sources in the 30 - 600 keV band for imaging, allowing a fully coded field of view of 9 Deg x 9 Deg with an angular resolution of 20 arcmin. To reduce the background radiation, the detector is surrounded by semi-graded (Pb/Sn/Cu) passive shields on the four sides all the way to the mask. ...

  10. Comparison of therapeutic effect between percutaneous kyphoplasty and pedicle screw system on vertebral compression fracture

    Institute of Scientific and Technical Information of China (English)

    MING Jiang-hua; ZHOU Jian-lin; ZHOU Pang-hu; ZHOU Jian-peng

    2007-01-01

    Objective:To compare the clinical efficacy of percutaneous kyphoplasty (PKP) with pedicle screw system(PS) in the treatment of vertebral compression fracture(VCF). Methods:Eighty-six patients with VCF were treated either by PKP (Group A,n = 30) ) or PS ( Group B,n =56).The anterior,intermediate,and posterior heights of the vertebrae body,visual analogue pain scale(VAS) before and after operation,the duration of operation,and amount of blood loss between two groups were compared. Results:No statistical difference was noted regarding the vertebral height between two groups. Significant difference was seen in VAS,duration of operation and amount of blood loss between the two groups ( P < 0.01). Conclusions:Percutaneous kyphoplasty has the similar therapeutic efficacy with pedicle screw system in treatment of VCF with a minimal invasion,less operation time and blood loss. For those with posterior wall destruction,PS is deemed favorable.

  11. Adverse Prognostic Factors and Optimal Intervention Time for Kyphoplasty/Vertebroplasty in Osteoporotic Fractures

    Directory of Open Access Journals (Sweden)

    Ioannis D. Papanastassiou

    2014-01-01

    Full Text Available Introduction. While evidence supports the efficacy of vertebral augmentation (kyphoplasty and vertebroplasty for the treatment of osteoporotic fractures, randomized trials disputed the value of vertebroplasty. The aim of this analysis is to determine the subset of patients that may not benefit from surgical intervention and find the optimal intervention time. Methods. 27 prospective multiple-arm studies with cohorts of more than 20 patients were included in this meta-analysis. We hereby report the results from the metaregression and subset analysis of those trials reporting on treatment of osteoporotic fractures with kyphoplasty and/or vertebroplasty. Results. Early intervention (first 7 weeks after fracture yielded more pain relief. However, spontaneous recovery was encountered in hyperacute fractures (less than 2 weeks old. Patients suffering from thoracic fractures or severely deformed vertebrae tended to report inferior results. We also attempted to formulate a treatment algorithm. Conclusion. Intervention in the hyperacute period should not be pursued, while augmentation after 7 weeks yields less consistent results. In cases of thoracic fractures and significant vertebral collapse, surgeons or interventional radiologists may resort earlier to operation and be less conservative, although those parameters need to be addressed in future randomized trials.

  12. Buddy balloon for TAVI.

    Science.gov (United States)

    Balkin, Jonathan; Silberman, Shuli; Almagor, Yaron

    2013-11-15

    Percutaneous transfemoral aortic valve replacement is a new rapidly evolving technique that has made significant progress in recent years. The technology is however limitted and in some cases has resulted in failure to deliver the prosthetic valve. We describe a new technique using a buddy balloon, from the contralateral femoral artery, to assist in crossing the native aortic valve in those cases where extreme calcification and or tortuosity have caused the delivery system to hang up on the aortic wall. The technique is easily applied and facilitates the success of the procedure in cases which may otherwise have to be converted to open surgical aortic valve replacement.

  13. A Methane Balloon Inflation Chamber

    Science.gov (United States)

    Czerwinski, Curtis J.; Cordes, Tanya J.; Franek, Joe

    2005-01-01

    The various equipments, procedure and hazards in constructing the device for inflating a methane balloon using a standard methane outlet in a laboratory are described. This device is fast, safe, inexpensive, and easy to use as compared to a hydrogen gas cylinder for inflating balloons.

  14. Nationwide Eclipse Ballooning Project

    Science.gov (United States)

    Colman Des Jardins, Angela; Berk Knighton, W.; Larimer, Randal; Mayer-Gawlik, Shane; Fowler, Jennifer; Harmon, Christina; Koehler, Christopher; Guzik, Gregory; Flaten, James; Nolby, Caitlin; Granger, Douglas; Stewart, Michael

    2016-05-01

    The purpose of the Nationwide Eclipse Ballooning Project is to make the most of the 2017 rare eclipse event in four main areas: public engagement, workforce development, partnership development, and science. The Project is focused on two efforts, both student-led: online live video of the eclipse from the edge of space and the study of the atmospheric response to the eclipse. These efforts, however, involving more than 60 teams across the US, are challenging in many ways. Therefore, the Project is leveraging the NASA Space Grant and NOAA atmospheric science communities to make it a success. The first and primary topic of this poster is the NASA Space Grant supported online live video effort. College and high school students on 48 teams from 31 states will conduct high altitude balloon flights from 15-20 locations across the 8/21/2017 total eclipse path, sending live video and images from near space to a national website. Video and images of a total solar eclipse from near space are fascinating and rare. It’s never been done live and certainly not in a network of coverage across a continent. In addition to the live video to the web, these teams are engaged in several other science experiments as secondary payloads. We also briefly highlight the eclipse atmospheric science effort, where about a dozen teams will launch over one hundred radiosondes from across the 2017 path, recording an unprecedented atmospheric data sample. Collected data will include temperature, density, wind, humidity, and ozone measurements.

  15. Computed Tomography During Experimental Balloon Dilatation For Calcific Aortic Stenosis. A Look into the Mechanism of Valvuloplasty

    NARCIS (Netherlands)

    C. di Mario (Carlo); L.C.P. van Veen; DE BAAT, L. (LEEN); C.E. Essed; K.J. Beatt (Kevin); O. Leborgne; SERRUYS, P.W. (PATRICK W.)

    1988-01-01

    textabstractThin‐slice contiguous computed tomographic scanning was performed in four postmortem hearts with calcific aortic valve stenosis (mean weight: 583 ± 78 g; mean age: 65 ± 10 years) before, during, and after balloon valvuloplasty. Balloons of increasing diameter (15–19 mm single balloons, a

  16. 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.

  17. Local drug-delivery balloon for proliferative occlusive in-stent restenosis after drug-eluting stent

    Institute of Scientific and Technical Information of China (English)

    Gianluca Rigatelli; Paolo Cardaioli; Fabio Dell'Avvocata; Massimo Giordan

    2011-01-01

    Drug-coated balloon has been developed as an alternative to drug-eluting stents for in-stent restenosis but the performance of drug infusion balloon in such setting has not been previously described. We present a case of particularly aggressive in-stent restenosis after drug eluting stent implantation treated with a new kind of drug infusion balloon developed in order to overcome the impossibility to inflate regular drug-coated balloon for several dilatation.

  18. 椎体后凸成形术治疗高龄骨质疏松性椎体压缩骨折%Treatment of Osteoporotic Vertebra Compressive Fractures in the over 80-year-old Patients with Percutaneous Kyphoplasty

    Institute of Scientific and Technical Information of China (English)

    贾璞; 李元; 唐海

    2009-01-01

    目的 探讨单一球囊扩张经皮椎体后凸成形术治疗80 岁以上老年骨质疏松性椎体压缩骨折的疗效及安全性.方法 回顾分析高龄(80岁及其以上)老年骨质疏松性椎体压缩骨折患者15 例,男性3 例,女性12 例,平均年龄(82.2±1.9)岁.共45个椎体,均为骨质疏松性脊柱压缩骨折,压缩骨折椎体后壁均完整.全部在C型臂X线机引导下行单侧入路、单一球囊椎体后凸成形术.结果 患者平均能在术后第2天下床行走,未发现严重手术并发症.椎体前缘、中部及后缘平均高度分别由术前的(2.17±0.82) cm、(1.75±0.66) cm、(2.95±0.43) cm增至术后的(2.40±0.73) cm、(2.11±0.51)cm、(3.00±0.45) cm,椎体前缘、中部高度差异有显著统计学意义(P<0.01);术后48 h患者胸腰背痛均有缓解,术前、术后48 hVAS评分比较差异有显著统计学意义(P<0.01).结论 应用椎体后凸成形术治疗高龄骨质疏松性椎体压缩骨折,能够安全、有效地改善骨折椎体高度,明显缓解疼痛,早期下床活动.%Objective To evaluate the efficiency and safety of percutaneous kyphoplasty in treating osteoporotic vertebra compressive fractures in the elderly(≥80 years)with one balloon.Methods 15 cases were retrospectively reviewed(3 males,12 females),and all with well intact posterior wall of vertebral body.45 vertebral bodies were treated by percutaneous kyphoplasty with one balloon under"C"armed imaging guiding by an unipedicular approach.Results All the procedures of 15 patients were successful without any complication.The mean height of the anterior,media and posterior vertebral bodies was(2.17±0.82) cm、(1.75±0.66) cm、(2.95±0.43) cm preoperatively and(2.40±0.73) cm、(2.11±0.51) cm、(3.00±0.45) cm postoperatively(P<0.01).The VAS of pre and post-operation were declined significantly after the treatment(P<0.01).Conclusion Percutaneous kyphoplasty for senior people(≥80 year) with osteoporotic vertebra

  19. 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.

  20. Comparison of therapeutic effect between percutaneous vertebroplasty and kyphoplasty on vertebral compression fracture

    Institute of Scientific and Technical Information of China (English)

    ZHOU Jian-lin; LIU Shi-qing; MING Jiang-hua; PENG Hao; QIU Bo

    2008-01-01

    Objective: To compare the clinical efficacy of percutaneous vertebroplasty ( PVP) with percutaneous kyphoplasty ( PKP ) in the treatment of vertebral compression fracture (VCF).Methods: Ninety-eight patients with VCF were treated by PVP (n =42) or PKP (n = 56). The anterior midline and posterior heights of vertebrae body, preoperative and postoperative visual analogue scale (VAS), operation time and amount of blood loss were compared between 2 groups.Results: There was statistical difference in vertebral height between two groups (P<0. 01). No significant difference was seen in VAS, operation time and blood loss between two groups (P<0. 05).Conclusions: PKP and PVP have the similar therapeutic efficacy in treatment of VCF with minimal invasion, less operation time and blood loss. However, PKP is superior in the recovery of vertebral height.

  1. 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...

  2. 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...

  3. 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...

  4. Introduction (Special Issue on Scientific Balloon Capabilities and Instrumentation)

    Science.gov (United States)

    Gaskin, Jessica A.; Smith, I. S.; Jones, W. V.

    2014-01-01

    In 1783, the Montgolfier brothers ushered in a new era of transportation and exploration when they used hot air to drive an un-tethered balloon to an altitude of 2 km. Made of sackcloth and held together with cords, this balloon challenged the way we thought about human travel, and it has since evolved into a robust platform for performing novel science and testing new technologies. Today, high-altitude balloons regularly reach altitudes of 40 km, and they can support payloads that weigh more than 3,000 kg. Long-duration balloons can currently support mission durations lasting 55 days, and developing balloon technologies (i.e. Super-Pressure Balloons) are expected to extend that duration to 100 days or longer; competing with satellite payloads. This relatively inexpensive platform supports a broad range of science payloads, spanning multiple disciplines (astrophysics, heliophysics, planetary and earth science.) Applications extending beyond traditional science include testing new technologies for eventual space-based application and stratospheric airships for planetary applications.

  5. 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.

  6. Treatment of osteoporotic compression fracture of thoracic/lumbar vertebrae by kyphoplasty with SKY bone expander system

    Institute of Scientific and Technical Information of China (English)

    XIONG Jian; DANG Yu; JIANG Bao-guo; FU Zhong-guo; ZHANG Dian-ying

    2010-01-01

    Objective: To investigate prospectively the effectiveness of kyphoplasty with SKY bone expander system in treatment of compression fracture of thoracic/lumbar vertebrae and correction of the deformity.Methods: Twenty-five patients with thoracic/lumbar vertebral osteoporotic compression fracture were admitted to our hospital between March 2007 and March 2008, and treated by kyphoplasty with SKY bone expander system.Patient's pain status was rated with Visual Analogue Scale (VAS) score system 1 day before and 1 hour, 48 hours, 6months, 12 months after surgery. In addition, Rolland-Morris and Oswestry disability questionnaires (RDQ and ODI)were used for survey 1 day before and 1, 6, 12 months after surgery. Pre- and post-operative vertebral heights and Cobb's angles were measured based on the X-ray films and statistically analyzed.Results: There were 27 fractured vertebrae in these 25 patients. After SKY kyphoplasty, the Cobb's angles (9.8°±9.76°) were significantly reduced compared with preoperative angles (17.18o±9.35°, P<0.05 ), and the average improvement rate was 39%. Patients' pain VAS scores were also greatly improved after operation (P<0.05). Moreover, postoperative RDQ and ODI scores were significantly smaller than preoperative values (P<0.05).Conclusions: Kyphoplasty with SKY bone expander system provides an effective method for treating thoracic/lumbar vertebral osteoporotic compression fracture, with the advantages of small surgical wound and short duration.It can effectively recover the anterior and medial heights of fractured vertebrae (33% and 50%, respectively), reduce the Cobb's angle, quickly alleviate pain and improve patients'quality of life in a relatively short time period.

  7. Report on the Brazilian Scientific Balloon Program

    Science.gov (United States)

    Braga, Joao

    2016-07-01

    We report on the recent scientific ballooning activities in Brazil, and present the plans for the next few years. Recent technological developments, especially on telecommunications and gondola attitude control systems will be reported. We also present the recent progress achieved in the development of the protoMIRAX balloon experiment. protoMIRAX is a balloon-borne hard X-ray imaging telescope under development at INPE as a pathfinder for the MIRAX (Monitor e Imageador de Raios X) satellite mission. The experiment consists essentially in a hard X-ray coded-aperture imager to operate in the 20-200 keV energy range. The detector plane is a square array of 196 10mm x 10mm x 2mm CdZnTe (CZT) planar detectors. A collimator defines a fully-coded field-of-view of 20 x 20 degrees, with 7 x 7 degrees of full sensitivity and an angular resolution of 1.7 degrees. We describe the final stages of development and testing of the front-end electronics, with charge preamplifiers, LNAs, shapers and Wilkinson-type ADCs customized for these detectors. We also show detailed Monte Carlo simulations of the flight background and the expected flight images of bright sources performed with the use of GEANT4.

  8. 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.

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

    Science.gov (United States)

    2016-01-01

    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. PMID:27766261

  10. Vertebroplasty

    Science.gov (United States)

    ... not collapse again. This procedure is similar to kyphoplasty . However, kyphoplasty involves the use of a balloon that is ... problem is more common with this procedure than kyphoplasty. You may need spine surgery to correct leakage ...

  11. Ballooning osteolysis in 71 failed total ankle arthroplasties.

    Science.gov (United States)

    Singh, Gurpal; Reichard, Theresa; Hameister, Rita; Awiszus, Friedemann; Schenk, Katja; Feuerstein, Bernd; Roessner, Albert; Lohmann, Christoph

    2016-08-01

    Background and purpose - Aseptic loosening is a major cause of failure in total ankle arthroplasty (TAA). In contrast to other total joint replacements, large periarticular cysts (ballooning osteolysis) have frequently been observed in this context. We investigated periprosthetic tissue responses in failed TAA, and performed an element analysis of retrieved tissues in failed TAA. Patients and methods - The study cohort consisted of 71 patients undergoing revision surgery for failed TAA, all with hydroxyapatite-coated implants. In addition, 5 patients undergoing primary TAA served as a control group. Radiologically, patients were classified into those with ballooning osteolysis and those without, according to defined criteria. Histomorphometric, immunohistochemical, and elemental analysis of tissues was performed. Von Kossa staining and digital microscopy was performed on all tissue samples. Results - Patients without ballooning osteolysis showed a generally higher expression of lymphocytes, and CD3+, CD11c+, CD20+, and CD68+ cells in a perivascular distribution, compared to diffuse expression. The odds of having ballooning osteolysis was 300 times higher in patients with calcium content >0.5 mg/g in periprosthetic tissue than in patients with calcium content ≤0.5 mg/g (p < 0.001). Interpretation - There have been very few studies investigating the pathomechanisms of failed TAA and the cause-effect nature of ballooning osteolysis in this context. Our data suggest that the hydroxyapatite coating of the implant may be a contributory factor.

  12. Coolability of ballooned VVER bundles with pellet relocation

    Energy Technology Data Exchange (ETDEWEB)

    Hozer, Z.; Nagy, I.; Windberg, P.; Vimi, A. [AEKI, P.O.box 49, Budapest, H-1525 (Hungary)

    2009-06-15

    During a LOCA incident the high pressure in the fuel rods can lead to clad ballooning and the debris of fuel pellets can fill the enlarged volume. The evaluation of the role of these two effects on the coolability of VVER type fuel bundles was the main objective of the experimental series. The tests were carried out in the modified configuration of the CODEX facility. 19-rod electrically heated VVER type bundle was used. The test section was heated up to 600 deg. C in steam atmosphere and the bundle was quenched from the bottom by cold water. Three series of tests were performed: 1. Reference bundle with fuel rods without ballooning, with uniform power profile. 2. Bundle with 86% blockage rate and with uniform power profile. The blockage rate was reached by superimposing hollow sleeves on all 19 fuel rods. 3. Bundle with 86% blockage rate and with local power peak in the ballooned area. The local power peak was produced by the local reduction the cross section of the internal heater bar inside of the fuel rods. In all three bundle configurations three different cooling water flow-rates were applied. The experimental results confirmed that a VVER bundle with even 86% blockage rate remains coolable after a LOCA event. The ballooned section creates some obstacles for the cooling water during reflood of the bundle, but this effect causes only a short delay in the cooling down of the hot fuel rods. Earlier tests on the coolability of ballooned bundles were performed only with Western type bundles with square fuel lattice. The present test series was the first confirmation of the coolability of VVER type bundles with triangular lattice. The accumulation of fuel pellet debris in the ballooned volume results in a local power peak, which leads to further slowing down of quench front. The first tests indicated that the effect of local power peak was less significant on the delay of cooling down than the effect of ballooning. (authors)

  13. 经皮穿刺椎体后凸成形术对 Tomita 分值高的脊柱转移瘤的疗效观察%Treatment of high Tomita score spinal metastatic tumor with percutaneous kyphoplasty

    Institute of Scientific and Technical Information of China (English)

    江铭; 朱文雄; 梁皓华; 吴海谊; 叶学年; 郭建恩

    2015-01-01

    目的:探讨椎体后凸成形术治疗 Tomita 分值高的脊柱转移瘤的临床效果。方法回顾2010年12月~2014年10月应用椎体后凸成形术治疗的脊柱转移瘤患者21例50个椎体,所有患者 Tomita 评分均在7分以上,均为多节段脊柱转移瘤,以 VAS 评分及美国东部肿瘤协作组(ECOG)评估活动能力作为手术治疗效果的评价指标。结果21例患者共50个病椎均穿刺成功,术程顺利,VAS 评分术前及术后分别为(8.53±0.72)分和(1.80±0.66)分(P 7)were treated with percutaneous kyphoplasty,all the tumors were multi- segment spinal metastatic tumors.Clinical efficacy was evaluated by using Visual Ana-logue Score (VAS)and Eastern Cooperative Oncology Group (ECOG)performance status. Results Trans-pedicular approach and percutaneous kyphoplasty succeeded for all 21 patients,50 ill vertebral bodies.Com-pared pre-operative VAS of (8.53±0.72)to post-operative VAS of (1.80±0.66)showed statistical differ-ence (P <0.05).One case had grade IV ECOG scale and was improved to grade III,10 of 1 1 cases had grade III ECOG scale which were improved to grade II,3 of 9 cases had grade II ECOG scale,which were improved to grade I.And no perioperative death. Conclusion Percutaneous kyphoplasty is safe and effective for high To-mita score spinal metastatic tumor in rapidly easing spinal lesion pain,improving activity function and impro-ving patients'quality of life.

  14. Balloon Exoplanet Nulling Interferometer (BENI)

    Science.gov (United States)

    Lyon, Richard G.; Clampin, Mark; Woodruff, Robert A.; Vasudevan, Gopal; Ford, Holland; Petro, Larry; Herman, Jay; Rinehart, Stephen; Carpenter, Kenneth; Marzouk, Joe

    2009-01-01

    We evaluate the feasibility of using a balloon-borne nulling interferometer to detect and characterize exosolar planets and debris disks. The existing instrument consists of a 3-telescope Fizeau imaging interferometer with 3 fast steering mirrors and 3 delay lines operating at 800 Hz for closed-loop control of wavefront errors and fine pointing. A compact visible nulling interferometer is under development which when coupled to the imaging interferometer would in-principle allow deep suppression of starlight. We have conducted atmospheric simulations of the environment above 100,000 feet and believe balloons are a feasible path forward towards detection and characterization of a limited set of exoplanets and their debris disks. Herein we will discuss the BENI instrument, the balloon environment and the feasibility of such as mission.

  15. Yellow Balloon in a Briar Patch.

    Science.gov (United States)

    Cooper, Frank; Fitzmaurice, Robert W.

    1978-01-01

    As part of a meteorology unit, sixth grade science students launched helium balloons with attached return postcards. This article describes Weather Service monitoring of the balloons and postcard return results. (MA)

  16. Comparison of unipedicular and bipedicular percutaneous kyphoplasty for treating osteoporotic vertebral compression fractures:a meta-analysis

    Institute of Scientific and Technical Information of China (English)

    LI Lian-hua; SUN Tian-sheng; LIU Zhi; ZHANG Jian-zheng; ZHANG Yan; CAI Yan-hong; WANG Hao

    2013-01-01

    Background Percutaneous vertebroplasty (PKP) has proved its effectiveness regarding minimal invasion,rapid pain reduction,safe cement augmentation,restoring vertebral height,and accelerating complete recovery of osteoporotic vertebral compression fractures (OVCFs).Whether unipedicular or bipedicular PKP provides a better outcome is controversial.Methods We searched PubMed,Cochrane Database of Systematic Reviews,Cochrane Central Register of Controlled Trials,Web of Knowledge,Chinese Biomedical Literature Database,and Wanfang Data from January 1980 to March 2013 with "kyphoplasty","unipedicular","bipedicular","compression fracture",and "randomized controlled trial".Risk of bias in the included studies was assessed according to a 12-item scale.Meta-analysis was performed.Dichotomous and continuous variables were calculated using the odds ratio (OR) and standardized mean difference (SMD),respectively.Results Seven studies involving 440 patients and 559 vertebral bodies met the criteria for inclusion.Among them,one randomized controlled trial had a high risk of bias and six a low risk.The pain visual analogue scale (VAS) SMDs were -0.02 (P=0.88) for short-term follow-up (≤3 months) and 0.03 (P=0.82) for long-term follow-up (≥ 1 year).Oswestry Disability Index (ODI) SMDs at short-and long-term follow-up were not statistically significant (-0.04,P=0.77 and-0.07,P=0.74,respectively).This meta-analysis showed greater polymethylmethacrylate volume (SMD-1.08,P=0.00) and operation time (SMD-2.40,P=0.00),favoring unipedicular PKP.Radiographic outcomes-preoperative kyphosis angle,restoration rate,reduction angle,loss of reduction angle-were not statistically different between the groups.Pooled analyses of cement leakage and subsequent adjacent OVCFs showed no significant differences between the groups,with OR=0.82 (P=0.79) and OR=1.41 (P=0.70),respectively.Conclusions This meta-analysis comparing unipedicular and bipedicular PKP demonstrated no significant differences

  17. 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

  18. Ballonnen in zee = balloons as marine litter

    NARCIS (Netherlands)

    Franeker, van J.A.

    2008-01-01

    Releasing balloons seems harmless. However, remains of balloons, especially valves and ribbons are becoming a common and persistent type of marine litter found on beaches. Following Dutch Queens day 2007, large numbers of Dutch balloons were found in Normandy, France. Animals may become entangled in

  19. 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

  20. Stratospheric balloons from Esrange - current and future capabilities

    Science.gov (United States)

    Norberg, O.

    Stratospheric balloon operations have been carried out at the Swedish Space Corporation's rocket, balloon and satellite operations base Esrange since 1974; approximately 550 stratospheric balloons have been launched during this period. The facility, located in northern Sweden at 68 degrees north, is fully equipped with a large launch pad, payload and flight train preparation hangars, telemetry stations, recovery helicopters, and supporting infrastructure. Many of the scientific balloons launched are CNES missions. This paper will present the possibilities for scientific and technical balloon missions at high latitudes and with a vast landing area in northern Sweden, Finland, and Russia. The proximity to the Arctic polar vortex makes Esrange an ideal base for studies of for example the ozone destruction process in the Arctic. A new option proposed by the Swedish Space Corporation and NASA is to perform week-long missions from the south of Sweden to western Canada. A newly developed line-of-sight telemetry system, E-LINK, for high bit-rates (> 2 Mbps both downlink and uplink) and based on the Ethernet communication standard is also described.

  1. Unilateral percutaneous baloon kyphoplasty for osteoporotic thoracolumbar compression fractures in the elderly%单侧穿刺后凸成形治疗高龄骨质疏松胸腰椎压缩骨折

    Institute of Scientific and Technical Information of China (English)

    顾晓晖; 夏冰; 张喆; 陈锦平; 毕擎

    2013-01-01

      Objective To evaluate the efficacy and safty of unilateral percutaneous baloon kyphoplasty for osteoporotic thoracolumbar compression fractures in the elderly . Methods 21 consecutive procedures were performed in 21 patients of osteoporotic thoracolumbar fractures in the elderly . under local anesthesia. This operation involved unilateral percutaneous insertion of one inflatable bone tamps into the anterior-center part of fractured vertebral body under fluoroscopic guidance . Inflation of the bone tamp would elevate the endplates, restoring the vertebral body back toward its original height, while creating a cavity to be filed with bone cement. The operative time and frequency of X-ray imagining were documented. The radiographic findings and back pain before kyphoplasty were compared with that after kyphoplasty. Results Al patients tolerated the procedure wel with immediate relief of their back pain in 24 hours(P<0.05). The mean operative time was 30.6 min(25~45min).The patients were alowed to take walk next day after the procedure. Complications such as epidural cement leakage or neural damange were not demonstrated in the study. The mean kyphosis and vertebral height was improved obviousiy(P<0.05). The average number of fluoroscopy was 21.5(15~28). Conclusion Unilateral percutaneous baloon kyphoplasty is a safe and effective therapy for osteoporotic thoracolumbar compression fractures in the elderly. The operation has been found to be a minimaly invasive and rapid procedure . The number of fluoroscopy and the amount of X-ray radiation decrease significantly because bilateral perform is not required in operation.%  目的:研究单侧入路穿刺球囊扩张椎体后凸成形术治疗高龄骨质疏松性胸腰椎压缩性骨折的效果和安全性。方法:高龄骨质疏松性胸腰椎压缩性骨折21例,经皮伤椎仅行单侧入路穿刺建立工作通道,放置单枚可扩张球囊于伤椎,扩张球囊抬升终板,注入骨水泥强

  2. Pseudoperforation during kissing balloon angioplasty.

    Science.gov (United States)

    Panetta, Carmelo J; Fasseas, Panayotis; Raveendran, Ganesh; Garratt, Kirk N

    2004-11-01

    We describe a case of apparent perforation during kissing balloon angioplasty of a bifurcation lesion. There was no evidence of perforation on follow-up angiography or via intravascular ultrasound. Possible etiologies include minimal perforation that immediately sealed postdeflation or forced contrast into the microvascular bed via a proximal side branch.

  3. 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.

  4. 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

  5. Percutaneous kyphoplasty combined with the posterior screw-rod system in treatment of osteoporotic thoracolumbar fractures

    Directory of Open Access Journals (Sweden)

    Jiang Wu

    2013-01-01

    Materials and Methods: Twenty six patients (65 years of age or older with the single spine fractures included in study. The preoperative bone mineral density was measured by dual-energy X-ray. The PKP was done in all the cases. Decompression was done if neurological symptoms were present. Results: The results demonstrated osteoporosis with BMD T value ≤ −2.5; injured posterior vertebral body (3 cases had shown the whole damage accompanied by neurological symptoms through X-ray or CT. After 2 days, the remaining patients of back pain symptoms were relieved or disappeared except for three cases of patients with decompression incision. VAS score and Cobb angle changed from preoperative 8.23 ± 0.17 and 28.7 ± 0.33° respectively to postoperative 3.77 ± 0.44 and 3.8 ± 0.2° respectively. Conclusion: Treatment of rupture of the posterior vertebral osteoporotic thoracolumbar fractures by means of kyphoplasty combined with posterior screw-rod system is a safe, effective procedure.

  6. EUSO-Balloon: The first flight

    Science.gov (United States)

    Scotti, Valentina; Osteria, Giuseppe

    2016-07-01

    EUSO-Balloon is a pathfinder mission for JEM-EUSO, the near-UV telescope proposed to be installed on board the International Space Station (ISS). The main objective of this pathfinder mission is to perform a full scale end-to-end test of all the key technologies of JEM-EUSO detectors and to measure the UV background. The JEM-EUSO instrument consists of UV telescope designed to focus the signal of the UV tracks generated by Extreme Energy Cosmic Rays propagating in Earth's atmosphere, onto a finely pixelized UV camera. The EUSO-Balloon instrument, smaller than the one designed for the ISS, was launched on August 2014 from Timmins (Ontario, Canada). The flight lasted about five hours and the instrument reached a float altitude of about 40 km. From this altitude the telescope registered, at a rate of 400 000 frames/s, the nightglow background on forests, lakes and clouds, as well as city lights and artificial air showers tracks generated by means of a laser installed on an helicopter flying inside its field of view. In this contribution we will describe the instrument and its performance during the first flight.

  7. EUSO-Balloon: The first flight

    Energy Technology Data Exchange (ETDEWEB)

    Scotti, Valentina, E-mail: scottiv@na.infn.it; Osteria, Giuseppe

    2016-07-11

    EUSO-Balloon is a pathfinder mission for JEM-EUSO, the near-UV telescope proposed to be installed on board the International Space Station (ISS). The main objective of this pathfinder mission is to perform a full scale end-to-end test of all the key technologies of JEM-EUSO detectors and to measure the UV background. The JEM-EUSO instrument consists of UV telescope designed to focus the signal of the UV tracks generated by Extreme Energy Cosmic Rays propagating in Earth's atmosphere, onto a finely pixelized UV camera. The EUSO-Balloon instrument, smaller than the one designed for the ISS, was launched on August 2014 from Timmins (Ontario, Canada). The flight lasted about five hours and the instrument reached a float altitude of about 40 km. From this altitude the telescope registered, at a rate of 400 000 frames/s, the nightglow background on forests, lakes and clouds, as well as city lights and artificial air showers tracks generated by means of a laser installed on an helicopter flying inside its field of view. In this contribution we will describe the instrument and its performance during the first flight.

  8. Scientific Ballooning Technologies Workshop STO-2 Thermal Design and Analysis

    Science.gov (United States)

    Ferguson, Doug

    2016-01-01

    The heritage thermal model for the full STO-2 (Stratospheric Terahertz Observatory II), vehicle has been updated to model the CSBF (Columbia Scientific Balloon Facility) SIP-14 (Scientific Instrument Package) in detail. Analysis of this model has been performed for the Antarctica FY2017 launch season. Model temperature predictions are compared to previous results from STO-2 review documents.

  9. Investigating obscure gastrointestinal bleeding : capsule endoscopy or double balloon enteroscopy?

    NARCIS (Netherlands)

    Westerhof, J.; Weersma, R. K.; Koornstra, J. J.

    2009-01-01

    The possibility to visualise the small bowel has dramatically improved with the introduction of capsule endoscopy (CE) and double balloon enteroscopy (DBE). CE and DBE have become standard practice in investigating suspected diseases of the small bowel. An important reason to perform small bowel inv

  10. 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.

  11. The design and use of plastic balloons for stratospheric research in India

    Directory of Open Access Journals (Sweden)

    V. K. Balasubramanian

    1958-04-01

    Full Text Available "Plastic balloon flying has been developed at the Tata Institute of Fundamental Research as a research technique which has a number of important applications in India: (a cosmic ray studies; (b air sampling in the stratosphere for fall-out measurements; (c meteorological investigations; (d astronomical observations; (e defence research. Comparatively little work has been done till now in these fields at equatorial latitudes, particularly at stratospheric altitudes. Large plastic balloons with volumes of the order of half a million cubic feet, and more, have been constructed by heat welding polyethylene sheeting 0.0015"" thick. With these balloons, successful level flights at altitudes of 110,000 ft. have been achieved; in some cases, individual loads weighing a hundred pounds have been carried up. The most serious problem encountered is the extremely low temperature(about-85DegreeC, of the tropopause at the equatorial latitudes; all known plastics for balloon manufacture become brittle at these low temperatures. To overcome this, dark fabrics have been employed so that the material is heated by solar radiation. The plastic sheeting employed is extruded in India to balloon specifications from chosen polymers. The low temperatures and the turbulent conditions that prevail in the atmosphere at low latitudes present problems in balloon flying which are different from those encountered at high latitudes present in balloon flying which are different from those encountered at high latitudes. The techniques employed, the design of the balloons, and their performance under these conditions are discussed."

  12. 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.

  13. Vertebroplasty and kyphoplasty--a systematic review of cement augmentation techniques for osteoporotic vertebral compression fractures compared to standard medical therapy.

    Science.gov (United States)

    Robinson, Yohan; Olerud, Claes

    2012-05-01

    After more than two decades the treatment effect of cement augmentation of osteoporotic vertebral compression fractures (VCF) has now been questioned by two blinded randomised placebo-controlled trials. Thus many practitioners are uncertain on the recommendation for cement augmentation techniques in elderly patients with osteoporotic VCF. This systematic review analyses randomised controlled trials on vertebroplasty and kyphoplasty to provide an overview on the current evidence. From an electronic database research 8 studies could be identified meeting our inclusion criteria of osteoporotic VCF in elderly (age>60 years), treatment with vertebroplasty or kyphoplasty, controlled with placebo or standard medical therapy, quality of life, function, or pain as primary parameter, and randomisation. Only two studies were properly blinded using a sham-operation as control. The other studies were using a non-surgical treatment control group. Further possible bias may be caused by manufacturer involvement in financing of three published RCT. There is level Ib evidence that vertebroplasty is no better than placebo, which is conflicting with the available level IIb evidence that there is a positive short-term effect of cement augmentation compared to standard medical therapy with regard to QoL, function and pain. Kyphoplasty is not superior to vertebroplasty with regard to pain, but with regard to VCF reduction (evidence level IIb). Kyphoplasty is probably not cost-effective (evidence level IIb), and vertebroplasty has not more than short-term cost-effectiveness (evidence level IV). Vertebroplasty and kyphoplasty cannot be recommended as standard treatment for osteoporotic VCF. Ongoing sham-controlled trials may provide further evidence in this regard.

  14. 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.

  15. Influence of inflation pressure and balloon size on the development of intimal hyperplasia after balloon angioplasty. A study in the atherosclerotic rabbit.

    Science.gov (United States)

    Sarembock, I J; LaVeau, P J; Sigal, S L; Timms, I; Sussman, J; Haudenschild, C; Ezekowitz, M D

    1989-10-01

    To evaluate the effect of balloon size and inflation pressure on acute and subsequent outcome following balloon angioplasty (BA), 70 New Zealand White rabbits with bilateral femoral atherosclerosis were assigned to four groups: group 1, oversized balloon, low inflation pressure (n = 35 vessels; balloon size, 3.0 mm/inflation pressure, 5 atm); group 2, oversized balloon, high inflation pressure (n = 36; 3.0 mm/10 atm); group 3, appropriate size, low inflation pressure (n = 17; 2.5 mm/5 atm); and group 4, appropriate size balloon, high inflation pressure (n = 19; 2.5 mm/10 atm). Angiograms were obtained before, 10 minutes after, and 28 days after BA and read by two blinded observers using electronic calipers. The in vivo balloon-to-vessel ratio was measured for each group. There were eight non-BA controls. Rabbits were sacrificed either immediately (n = 34) or at 28 days after BA (n = 36), with the femoral vessels pressure perfused for histologic and morphometric analysis. The latter was performed at 28 days only. Absolute angiographic diameters increased in all groups immediately after BA (p less than 0.01). Acute angiographic success, defined as greater than 20% increase in luminal diameter, was higher using high inflation pressure (group 2, 32/36 [89%] and group 4, 16/19 [84%] vs. group 1, 23/35 [66%] and group 3, 9/17 [53%]; p less than 0.05). A 3.0-mm balloon resulted in significant oversizing irrespective of inflation pressure (balloon-to-vessel ratio, 1.5 +/- 0.1 vs. 1.1 +/- 0.1 to 1, for the 2.5-mm balloon). Vessels exposed to high inflation pressure had a significantly higher incidence of mural thrombus, dissection (p less than 0.01), and medial necrosis versus low pressure (p less than 0.05). At 28 days, the rates of restenosis (defined as greater than 50% loss of initial gain) were 14/20 (70%), 11/16 (69%), 5/10 (50%), and 5/10 (50%) for groups 1 through 4 (p = NS; a trend in favor of the groups using an oversized balloon). There was an increase in the

  16. Cutting balloon angioplasty vs. conventional balloon angioplasty in patients receiving intracoronary brachytherapy for the treatment of in-stent restenosis.

    Science.gov (United States)

    Fasseas, Panayotis; Orford, James L; Lennon, Ryan; O'Neill, Jessica; Denktas, Ali E; Panetta, Carmelo J; Berger, Peter B; Holmes, David R

    2004-10-01

    The objective of this study was to evaluate the safety and efficacy of cutting balloon angioplasty (CBA) for the treatment of in-stent restenosis prior to intracoronary brachytherapy (ICB). Cutting balloon angioplasty may reduce the incidence of uncontrolled dissection requiring adjunctive stenting and may limit "melon seeding" and geographic miss in patients with in-stent restenosis who are subsequently treated with ICB. We performed a retrospective case-control analysis of 134 consecutive patients with in-stent restenosis who were treated with ICB preceded by either CBA or conventional balloon angioplasty. We identified 44 patients who underwent CBA and ICB, and 90 control patients who underwent conventional percutaneous transluminal coronary angioplasty (PTCA) and ICB for the treatment of in-stent restenosis. Adjunctive coronary stenting was performed in 13 patients (29.5%) in the CBA/ICB group and 41 patients (45.6%; P 0.05). Despite sound theoretical reasons why CBA may be better than conventional balloon angioplasty for treatment of in-stent restenosis with ICB, and despite a reduction in the need for adjunctive coronary stenting, we were unable to identify differences in clinical outcome.

  17. Hyperspectral Polarimeter for Monitoring Balloon Strain Project

    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...

  18. Scientific Ballooning Activities and Recent Developments in Technology and Instrumentation of the TIFR Balloon Facility, Hyderabad

    Science.gov (United States)

    Buduru, Suneel Kumar

    2016-07-01

    The Balloon Facility of Tata Institute of Fundamental Research (TIFR-BF) is a unique center of expertise working throughout the year to design, fabricate and launch scientific balloons mainly for space astronomy, atmospheric science and engineering experiments. Recently TIFR-BF extended its support to new user scientists for conducting balloon launches for biological and middle atmospheric sciences. For the first time two balloon launches conducted for sending live lab rats to upper stratosphere and provided launch support for different balloon campaigns such as Tropical Tropopause Dynamics (TTD) to study water vapour content in upper tropospheric and lower stratospheric regions over Hyderabad and the other balloon campaign to study the Asian Tropopause Aerosol Layer (BATAL) during the Indian summer monsoon season. BATAL is the first campaign to conduct balloon launches during active (South-West) monsoon season using zero pressure balloons of different volumes. TIFR-BF also provided zero pressure and sounding balloon support to various research institutes and organizations in India and for several international space projects. In this paper, we present details on our increased capability of balloon fabrication for carrying heavier payloads, development of high strength balloon load tapes and recent developments of flight control and safety systems. A summary of the various flights conducted in two years will be presented along with the future ballooning plans.

  19. 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.

  20. Latex micro-balloon pumping in centrifugal microfluidic platforms.

    Science.gov (United States)

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

    2014-03-01

    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-step processes on a single microfluidic 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 mechanisms have been designed to study the pump performance 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 show 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, a desirable volume of liquid can be stored and pumped by adjusting the size of the micro-balloon.

  1. Radiofrequency-targeted vertebral augmentation versus traditional balloon kyphoplasty: radiographic and morphologic outcomes of an ex vivo biomechanical pilot study [Erratum

    Directory of Open Access Journals (Sweden)

    Block J

    2013-06-01

    Full Text Available Erratum Dalton BE, Kohm AC, Miller LE, Block JE, Poser RD. Clinical Interventions in Aging 2012,7:525–531. In the Disclosure section, Dr Andrew C Kohm is referred to as "AWK". This should be "ACK".Read the original article

  2. Paraplegia following intraaortic balloon circulatory assistance

    Directory of Open Access Journals (Sweden)

    Benício Anderson

    1999-01-01

    Full Text Available Intraaortic balloon counterpulsation is frequently used in patients experiencing severe ventricular dysfunction following maximal drug therapy. However, even with the improvement of percutaneous insertion techniques, the procedure has always been followed by vascular, infectious, and neurological complications. This article describes a case of paraplegia due to intraaortic balloon counterpulsation in the postoperative period of cardiac surgery.

  3. EUSO-BALLOON a pathfinder for detecting UHECR's from the edge of space

    Directory of Open Access Journals (Sweden)

    Scotti V.

    2013-06-01

    Full Text Available EUSO-Balloon has been conceived as a pathfinder mission for JEM-EUSO, to perform an end-to-end test of the subsystems and components, and to prove the global detection chain while improving our knowledge of the atmospheric and terrestrial UV background. Through a series of stratospheric balloon flights performed by the French Space Agency CNES, EUSO-BALLOON will serve as an evolutive test-bench for all the key technologies of JEM-EUSO. EUSO-Balloon also has the potential to detect Extensive Air Showers from above, marking a key milestone in the development of UHECR science, and paving the way for any future large scale, space-based UHECR observatory.

  4. Treatment of elderly severe osteoporotic vertebral compressive fractures by kyphoplasty%椎体后凸成形术治疗重度骨质疏松性椎体压缩骨折

    Institute of Scientific and Technical Information of China (English)

    唐海; 陈浩; 王炳强; 李锦军; 贾璞

    2010-01-01

    Objective To evaluate the feasibility and therapeutic effect of kyphoplasty in treating severe osteoporotic vertebral compressive fractures. Methods Thirty-five patients (48 vertebral bodies) with severe osteoporotic compressive fractures were included. There were 33 females and 2 males with the mean age of 74.2 years. The average compressive rate of the affected vertebral bodies was 77.0%. The thoracolumbar vertebrae were treated with kyphoplasties. Percutaneous puncture direction was adjusted according to compressive rate and shape of the vertebral bodies. The inflatable bone tamp was inserted into the fractured vertebral body. The balloon was inflated with low pressure and dilate-relieve-dilate method was applied. The balloon was deflated and withdrawn, leaving a cavity within the vertebral body, which then fulfilled with visualized bone cement. Preoperative and postoperative symptom level, complications and radiographic findings were recorded. Results All 35 patients tolerated procedure well. The mean heights of the anterior, mid and posterior vertebral body had improved from (0.8±0.1) cm, (0.8±0.2) cm, (2.1 ±0.8) cm preoperatively to (1.2±0.3) cm, (1.3±0.2) cm, (2.3±1.0) cm respectively after operation (P <0.05). There was significance difference between preoperative and postoperative heights of the anterior and mid vertebral body. The mean kyphosis was improved from 28.2°±5.2° before operation to 19.1°±4.9° after operation. Conclusion Kyphoplasty is feasible and effective for severe osteoporotic vertebral compressive fractures.%目的 探讨应用椎体后凸成形术治疗重度骨质疏松性椎体压缩骨折的可行性和疗效.方法 2003年8月至2008年6月,治疗椎体后壁完整的重度骨质疏松性椎体压缩骨折35例(48椎),男2例,女33例;年龄64~86岁,平均74.2岁.患椎压缩程度为75.8%~80.1%,平均77.0%.在"C"型臂X线机引导下经皮穿刺进针,建立工作通道后放入可扩张球囊,行"扩张-放松-

  5. A Spreadsheet Simulation Tool for Terrestrial and Planetary Balloon Design

    Science.gov (United States)

    Raquea, Steven M.

    1999-01-01

    During the early stages of new balloon design and development, it is necessary to conduct many trade studies. These trade studies are required to determine the design space, and aid significantly in determining overall feasibility. Numerous point designs then need to be generated as details of payloads, materials, mission, and manufacturing are determined. To accomplish these numerous designs, transient models are both unnecessary and time intensive. A steady state model that uses appropriate design inputs to generate system-level descriptive parameters can be very flexible and fast. Just such a steady state model has been developed and has been used during both the MABS 2001 Mars balloon study and the Ultra Long Duration Balloon Project. Using Microsoft Excel's built-in iteration routine, a model was built. Separate sheets were used for performance, structural design, materials, and thermal analysis as well as input and output sheets. As can be seen from figure 1, the model takes basic performance requirements, weight estimates, design parameters, and environmental conditions and generates a system level balloon design. Figure 2 shows a sample output of the model. By changing the inputs and a few of the equations in the model, balloons on earth or other planets can be modeled. There are currently several variations of the model for terrestrial and Mars balloons, as well there are versions of the model that perform crude material design based on strength and weight requirements. To perform trade studies, the Visual Basic language built into Excel was used to create an automated matrix of designs. This trade study module allows a three dimensional trade surface to be generated by using a series of values for any two design variables. Once the fixed and variable inputs are defined, the model automatically steps through the input matrix and fills a spreadsheet with the resulting point designs. The proposed paper will describe the model in detail, including current

  6. Variceal bleeding from ileum identified and treated by single balloon enteroscopy

    Institute of Scientific and Technical Information of China (English)

    Mario Traina; Ilaria Tarantino; Luca Barresi; Filippo Mocciaro

    2009-01-01

    We report a case of acute uncontrolled gastrointestinal bleeding in a patient with liver cirrhosis. The upper and lower endoscopy were negative for bleeding lesions. We decided to perform the examination of the small bowel using single-balloon enteroscopy. The lower enteroscopy revealed signs of bleeding from varices of the ileum. In this report, we showed that the injection of a sclerosant solution can be accomplished using a freehand technique via the single balloon enteroscopy.

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

    Energy Technology Data Exchange (ETDEWEB)

    Tixador, R.; Richoilley, G.; Gasset, G.; Planel, H. (Faculte de Medecine, Toulouse-Purpan (France))

    1982-05-17

    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.

  8. Basic development of a small balloon-mounted telemetry and its operation system by university students

    Science.gov (United States)

    Yamamoto, Masa-yuki; Kakinami, Yoshihiro; Kono, Hiroki

    ) method with a 3DCAD design software, we designed and manufactured a camera-platform type antenna rotator that automatically track the balloon direction based on the received GPS data as a balloon operation system on ground with automatic controlling software for the tracking system. In order to develop a future telemetry system onboard a small weather balloon, we have performed an onboard data logger system. In this presentation, system configuration of the automatic tracking system will be introduced more in detail. The telemetry system onboard the small balloon is currently under development. We have a plan to send the measured GPS coordinates, temperature, pressure, and humidity data detected by the onboard sensors to ground. A monitoring camera, a 3-axes accelerometer, geomagnetic azimuth measurement, and power monitoring were added to the developed data logger system. The acquired data will be stored in an SD card aboard as well as transmitted to the ground. Using a vacuum chamber with a pressure sensors and a constant-temperature reservoir in laboratory, environmental tests were operated. In this presentation, introducing the data obtained through the development of a prototype balloon system, our recent results and problems will be discussed.

  9. Percutaneous Retrieval of an Embolized Kyphoplasty Cement Fragment From the Pulmonary Artery: A Case Report and Literature Review

    Science.gov (United States)

    Lamparello, Nicole A.; Jaswani, Vijay; DeSousa, Keith; Shapiro, Maksim; Kovacs, Sandor

    2016-01-01

    We present a case of a 41-year-old man with symptomatic pulmonary cement embolism following percutaneous vertebral augmentation, which was successfully retrieved via a percutaneous endovascular approach, a novel technique with only two prior cases reported. Cement leakage, including venous embolization of cement into the cardiopulmonary circulation, is a known potential complication following percutaneous kyphoplasty and vertebroplasty. While many patients with pulmonary cement embolism are asymptomatic and likely go undiagnosed, others experience respiratory distress and hemodynamic compromise requiring surgical and medical intervention. The optimal management for pulmonary cement embolism must be tailored to fit each individual patient, dependent upon the acuity of the clinical presentation, coexisting patient comorbidities, and the risks of systemic anticoagulation. In our patient, cement migration was visualized in real-time during vertebral augmentation. Endovascular retrieval by our Interventional Radiology section obviated the need for anticoagulation therapy or more invasive open surgical procedures. PMID:27761188

  10. 单侧入路经皮椎体后凸成形术治疗老年人脊柱脆性骨折%Unipedicular percutaneous kyphoplasty for treatment of vertebral fragility fractures in the elderly

    Institute of Scientific and Technical Information of China (English)

    王增顺; 伍骥; 黄蓉蓉; 崔玉明; 郑超

    2012-01-01

    Objective To evaluate the clinical outcomes and efficiency of the unipedicular percutaneous kyphoplasty(PKP) in vertebral fragility fractures. Methods A prospective observational study was performed. Twenty patients with a total of 34 vertebral compression fractures underwent kyphoplasty utilizing a unilateral pedicular/unipedicular approach. The vertebral bodies were measured at the anterior margins. And visual analog scale(VAS), Cobb's angle were compared preoperatively, at day 2 and the end of follow-up postoperatively. Complications were recorded. Height restoration, pain relief and Cobb's angle change were assessed pre-and post-operatively. Results Twenty patients underwent unipedicular PKP for a total of 34 levels. The mean duration of follow-up was 15.5 months (ranging 10 to 20 months). The mean pre-operative anterior vertebral height was (17.68 ± 3.33)mm and postoperative one was (30.94 ± 3.22)mm, which was significantly different (P 0.05). The Cobb's angle decreased from (21.53° ± 5.22°) to (7.35° ± 2.16°), with statistical significance (P < 0.05). Cement extravagation was observed in one asymptomatic case (2.9%). Adjacent vertebral fractures were observed on 2 levels (5.9%) in 2 cases, who underwent kyphoplasty again. Conclusions Unipedicular PKP is both a safe and efficacious alternative to the traditional bipedicular kyphoplasty for the treatment of painful vertebral fragility fractures. And it is comparable with bipedicular kyphoplasty in height restoration, pain relief and Cobb's angle change. And also, it is faster, less expensive and involves less radiation exposure for the patient. It improves the life quality of the involved elderly cases.%目的 探讨单侧人路经皮椎体后凸成形术( PKP)治疗老年人脊柱脆性骨折的有效性.方法 2009年1月至2011年1月,使用经皮椎体后凸成形PKP工具包治疗20例34个椎体脊椎脆性骨折.记录手术前后椎体前缘高度、Cobb's角、VAS评分,术后2d、随访末与

  11. Optical coherence tomography layer thickness characterization of a mock artery during angioplasty balloon deployment

    Science.gov (United States)

    Azarnoush, Hamed; Vergnole, Sébastien; Boulet, Benoît; Lamouche, Guy

    2011-03-01

    Optical coherence tomography (OCT) is used to study the deformation of a mock artery in an angioplasty simulation setup. An OCT probe integrated in a balloon catheter provides intraluminal real-time images during balloon inflation. Swept-source OCT is used for imaging. A 4 mm semi-compliant polyurethane balloon is used for experiments. The balloon is inflated inside a custom-built multi-layer artery phantom. The phantom has three layers to mock artery layers, namely, intima, media and adventitia. Semi-automatic segmentation of phantom layers is performed to provide a detailed assessment of the phantom deformation at various inflation pressures. Characterization of luminal diameter and thickness of different layers of the mock artery is provided for various inflation pressures.

  12. The Advanced Scintillator Compton Telescope (ASCOT) balloon project

    Science.gov (United States)

    Bloser, Peter F.; Sharma, Tejaswita; Legere, Jason S.; Bancroft, Christopher M.; McConnell, Mark L.; Ryan, James M.; Wright, Alex M.

    2016-07-01

    We describe a project to develop new medium-energy gamma-ray instrumentation by constructing and flying a balloon-borne Compton telescope using advanced scintillator materials combined with silicon photomultiplier readouts. There is a need in high-energy astronomy for a medium-energy gamma-ray mission covering the energy range from approximately 0.4 - 20 MeV to follow the success of the COMPTEL instrument on CGRO. We believe that directly building on the legacy of COMPTEL, using relatively robust, low-cost, off-the-shelf technologies, is the most promising path for such a mission. Fortunately, high-performance scintillators, such as Lanthanum Bromide (LaBr3), Cerium Bromide (CeBr3), and p-terphenyl, and compact readout devices, such as silicon photomultipliers (SiPMs), are already commercially available and capable of meeting this need. We have conducted two balloon flights of prototype instruments to test these technologies. The first, in 2011, demonstrated that a Compton telescope consisting of an liquid organic scintillator scattering layer and a LaBr3 calorimeter effectively rejects background under balloon-flight conditions, using time-of-flight (ToF) discrimination. The second, in 2014, showed that a telescope using an organic stilbene crystal scattering element and a LaBr3 calorimeter with SiPM readouts can achieve similar ToF performance. We are now constructing a much larger balloon instrument, an Advanced Scintillator Compton Telescope (ASCOT) with SiPM readout, with the goal of imaging the Crab Nebula at MeV energies in a one-day flight. We expect a 4σ detection up to 1 MeV in a single transit. We present calibration results of the first detector modules, and updated simulations of the balloon instrument sensitivity. If successful, this project will demonstrate that the energy, timing, and position resolution of this technology are sufficient to achieve an order of magnitude improvement in sensitivity in the mediumenergy gamma-ray band, were it to be

  13. Improvement in Pulmonary Function of Chronic Obstructive Pulmonary Disease (COPD) Patients With Osteoporotic Vertebral Compression Fractures (OVCFs) After Kyphoplasty Under Local Anesthesia.

    Science.gov (United States)

    Sheng, Song; Zhenzhong, Sun; Weimin, Jiang; Yimeng, Wang; Qudong, Yin; Jinhui, Shi

    2015-03-01

    To investigate the changes in respiratory function of COPD patients with osteoporotic vertebral compression fractures (OVCFs) after kyphoplasty (KP). Pain scores, pulmonary function parameters (PFT), and local kyphotic angle (LKA) were measured in 31 older patients (25 women, 6 men) with OVCFs before, 3 days after and 3 months after kyphoplasty. The preoperative and postoperative (3 days, 3 months) PFT parameters were as follows: % pred FVC, 74.33 ± 12.35, 85.23.8 ± 13.23, and 84.86 ± 14.01; % pred FEV1, 60.23 ± 11.2, 60.02 ± 11.90, and 60.78 ± 12.70; FEV1/FVC ratio (%), 68.22 ± 16.74, 59.56 ± 13.23, and 60.77 ± 12.28, % pred MVV 52.46 ± 14.37, 55.23 ± 15.68, and 62.12 ± 14.48, respectively. The preoperative mean VAS score was 8.01 ± 1.41 and significantly decreased to 2.52 ± 0.89 and 2.34 ± 0.78 at 3 days, 3 months after kyphoplasty, respectively. The preoperative local kyphotic angle degree was 21.96 ± 5.75°, significantly decreased to 13.48 ± 6.12° 3 days after KP, and maintained 3 month after KP. The decrease in the VAS scores correlated with the PFT parameters; however, there were no significant correlations between the PFT parameters and the LKA, the VAS scores and the LKA. Kyphoplasty under local anesthesia is a safety treatment for the COPD patients with OVCFS, and is able to improve the lung function impaired by OVCFs.

  14. Airborne Internet Providing Tethered Balloon System

    Directory of Open Access Journals (Sweden)

    Suvriti Dhawan1

    2015-12-01

    Full Text Available In this paper we shall introduce a new system for providing wireless network communication over a specified area using ’lighter than air’ balloons. This technology will replace the existing fiber optic network system. This will be done by using a tethered balloon along with the payload (containing a receiver, a transmitter and a radio communication device.This payload will be suspended from the ground at an altitude (depending on the area of coverage required. Users under this area will be able to access this system directly for internet connectivity. This system can be used over large areas like universities, companies and societies to provide internet facility to their users through Wi-Fi or over an area where the user is specified (commercial purposes. Currently Google is working on similar idea called the ’Google Loon’ in which they use high altitude balloons which float at an altitude twice as high as air planes and the weather. They recently tested this system over New-Zealand by providing internet to their pilot testers on ground. Their balloons not being stationary, move with directional winds and have to be replaced one after the other to maintain consistency. This can be a huge problem over the areas where upper atmospheric winds are not in favorable direction. We can resolve this problem by using our stationary tethered balloon system which can communicate with the loon balloons to provide internet facility over a desired area. Moreover when our balloon will communicate with the loon balloon it will increase the coverage area as the loon balloon has to communicate to a point which is above the ground. Our system will not only replace the existing fiber optic system but it will also be selfsustaining i.e. It will generate its own power using solar panels.

  15. Stratospheric electric field measurements with transmediterranean balloons

    Science.gov (United States)

    de La Morena, B. A.; Alberca, L. F.; Curto, J. J.; Holzworth, R. H.

    1993-01-01

    The horizontal component of the stratospheric electric field was measured using a balloon in the ODISEA Campaign of Transmediterranean Balloon Program. The balloon flew between Trapani (Sicily) and El Arenosillo (Huelva, Spain) along the 39 deg N parallel at a height between 34 and 24 km. The high values found for the field on fair-weather and its quasi-turbulent variation, both in amplitude and direction, are difficult to explain with the classical electric field source. A new source, first described by Holzworth (1989), is considered as possibly causing them.

  16. 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 ...

  17. Cortical screw trajectory for instrumentation and fusion in the setting of osteopathic compression fracture allows for percutaneous kyphoplasty for adjacent level compression fractures.

    Science.gov (United States)

    Pacione, Donato; Kim, Irene; Wilson, Taylor A; Frempong-Boadu, Anthony

    2015-05-01

    Spinal fixation in the osteoporotic patient can be challenging due to the poor trabecular bone quality of the vertebral body. Patients with osteoporotic vertebral body compression fractures are at risk for future compression fractures at adjacent levels, especially after cement augmentation. The purpose of this technical report is to describe the utilization of a cortical screw trajectory along with kyphoplasty for a patient with an osteoporotic compression fracture as well as degenerative spinal disease. This trajectory allows for the possibility of percutaneous pedicle access in the event of future compression fractures. Our patient underwent a decompressive laminectomy and kyphoplasty at the level of an osteoporotic compression fracture. The fracture was stabilized with cortical screw instrumentation and fusion at a level above and a level below the fracture. Subsequently the patient developed an adjacent level fracture within the fusion construct. Due to the utilization of a cortical screw trajectory for the initial fusion, the traditional pedicle trajectory was still accessible. As a result, the new fracture was treated with a percutaneous kyphoplasty through a standard pedicle trajectory. In conclusion, the use of a cortical screw trajectory for stabilization of osteoporotic compression fractures provides for a stronger bone screw interface and avoids osteoporotic trabecular vertebral body bone. At the same time this trajectory allows for future percutaneous pedicular access in the event that the patient suffers future compression fractures.

  18. 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....

  19. Attitude determination for balloon-borne experiments

    CERN Document Server

    Gandilo, N N; Amiri, M; Angile, F E; Benton, S J; Bock, J J; Bond, J R; Bryan, S A; Chiang, H C; Contaldi, C R; Crill, B P; Devlin, M J; Dober, B; Dore, O P; Farhang, M; Filippini, J P; Fissel, L M; Fraisse, A A; Fukui, Y; Galitzki, N; Gambrel, A E; Golwala, S; Gudmundsson, J E; Halpern, M; Hasselfield, M; Hilton, G C; Holmes, W A; Hristov, V V; Irwin, K D; Jones, W C; Kermish, Z D; Klein, J; Korotkov, A L; Kuo, C L; MacTavish, C J; Mason, P V; Matthews, T G; Megerian, K G; Moncelsi, L; Morford, T A; Mroczkowski, T K; Nagy, J M; Netterfield, C B; Novak, G; Nutter, D; O'Brient, R; Pascale, E; Poidevin, F; Rahlin, A S; Reintsema, C D; Ruhl, J E; Runyan, M C; Savini, G; Scott, D; Shariff, J A; Soler, J D; Thomas, N E; Trangsrud, A; Truch, M D; Tucker, C E; Tucker, G S; Tucker, R S; Turner, A D; Ward-Thompson, D; Weber, A C; Wiebe, D V; Young, E Y

    2014-01-01

    An attitude determination system for balloon-borne experiments is presented. The system provides pointing information in azimuth and elevation for instruments flying on stratospheric balloons over Antarctica. In-flight attitude is given by the real-time combination of readings from star cameras, a magnetometer, sun sensors, GPS, gyroscopes, tilt sensors and an elevation encoder. Post-flight attitude reconstruction is determined from star camera solutions, interpolated by the gyroscopes using an extended Kalman Filter. The multi-sensor system was employed by the Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry (BLASTPol), an experiment that measures polarized thermal emission from interstellar dust clouds. A similar system was designed for the upcoming flight of SPIDER, a Cosmic Microwave Background polarization experiment. The pointing requirements for these experiments are discussed, as well as the challenges in designing attitude reconstruction systems for high altitude balloon flights. ...

  20. Retrieving Balloon Data in Flight Project

    Data.gov (United States)

    National Aeronautics and Space Administration —   NASA has plans to fly stratospheric ULDBs for missions of 100 days or more in the next few years. As these balloons circumnavigate the globe multiple times,...

  1. 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...

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

    Science.gov (United States)

    de Campos, Tarcísio Passos Ribeiro; de Lima, Carla Flavia; Cuperschmid, Ethel Mizrahy

    2016-01-01

    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. PMID:27141131

  3. 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)

  4. Power Systems Design for Long Duration Ballooning

    Science.gov (United States)

    Stilwell, Bryan; Chuzel, Alain

    2016-01-01

    The Columbia Scientific Balloon Facility has been designing and building high-altitude balloon power systems for over 26 years. With that experience, we have found certain types of PV panels, batteries, and charge controllers that are reliable in stratospheric environments. The ultimate goal is to ensure that power systems will provide power reliably throughout the duration of an LDB flight. The purpose of this presentation is to provide some general guidelines and best practices for power system design.

  5. Diagnostic and therapeutic direct peroral cholangioscopy using an intraductal anchoring balloon

    Institute of Scientific and Technical Information of China (English)

    Mansour A Parsi; Tyler Stevens; John J Vargo

    2012-01-01

    AIM:To report our experience using a recently introduced anchoring balloon for diagnostic and therapeutic direct peroral cholangioscopy (DPOC).METHODS:Consecutive patients referred for diagnostic or therapeutic peroral cholangioscopy were evaluated in a prospective cohort study.The patients underwent DPOC using an intraductal anchoring balloon,which was recently introduced to allow consistent access to the biliary tree with an ultraslim upper endoscope.The device was later voluntarily withdrawn from the market by the manufacturer.RESULTS:Fourteen patients underwent DPOC using the anchoring balloon.Biliary access with an ultraslim upper endoscope was accomplished in all 14 patients.In 12 (86%) patients,ductal access required sphincteroplasty with a 10-mm dilating balloon.Intraductal placement of the ultraslim upper endoscope allowed satisfactory visualization of the biliary mucosa to the level of the confluence of the right and left hepatic ducts in 13 of 14 patients (93%).Therapeutic interventions by DPOC were successfully completed in all five attempted cases (intraductal biopsy in one and DPOC guided laser lithotripsy in four).Adverse events occurred in a patient on immunosuppressive therapy who developed an intrahepatic biloma at the site of the anchoring balloon.This required hospitalization and antibiotics.Repeat endoscopic retrograde cholangiopancreatography 8 wk after the index procedure showed resolution of the biloma.CONCLUSION:Use of this anchoring balloon allowed consistent access to the biliary tree for performance of diagnostic and therapeutic DPOC distal to the biliary bifurcation.

  6. 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.

  7. The balloon-borne electron telescope with scintillating fibers (BETS)

    CERN Document Server

    Torii, S; Tateyama, N; Yoshida, K; Ouchi, Y; Yamagami, T; Saitô, Y; Murakami, H; Kobayashi, T; Komori, Y; Kasahara, K; Yuda, T; Nishimura, J

    2000-01-01

    we describe a new detector system developed for high-altitude balloon flights to observe the cosmic-ray electrons above 10 GeV. The balloon borne electron telescope with Scintillating (BETS) fibers instrument is an imaging calorimeter which is capable of selecting electrons against the large background of protons. The calorimeter is composed of a sandwich of scintillating optical-fiber belts and lead plates with a combination of three plastic scintillators for the shower trigger. The total thickness of lead is 40 mm (~7.1 r.l.) and the number of fiber belts is nine. In each belt, alternating layers are oriented in orthogonal (x and y) directions. Two sets of an intensified CCD camera are adopted for read-out of the scintillating fibers in the x and y direction, respectively. The accelerator beam tests were carried out to study the performance of detector for electrons in 1996 and for protons in 1997 at CERN-SPS. The instrument was successfully flown aboard high-altitude balloon in 1997 and 1998. It is demonst...

  8. Precision Attitude Control for the BETTII Balloon-Borne Interferometer

    Science.gov (United States)

    Benford, Dominic J.; Fixsen, Dale J.; Rinehart. Stephen

    2012-01-01

    The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII) is an 8-meter baseline far-infrared interferometer to fly on a high altitude balloon. Operating at wavelengths of 30-90 microns, BETTII will obtain spatial and spectral information on science targets at angular resolutions down to less than half an arcsecond, a capability unmatched by other far-infrared facilities. This requires attitude control at a level ofless than a tenth of an arcsecond, a great challenge for a lightweight balloon-borne system. We have designed a precision attitude determination system to provide gondola attitude knowledge at a level of 2 milliarcseconds at rates up to 100Hz, with accurate absolute attitude determination at the half arcsecond level at rates of up to 10Hz. A mUlti-stage control system involving rigid body motion and tip-tilt-piston correction provides precision pointing stability to the level required for the far-infrared instrument to perform its spatial/spectral interferometry in an open-loop control. We present key aspects of the design of the attitude determination and control and its development status.

  9. A Low Cost Weather Balloon Borne Solar Cell Calibration Payload

    Science.gov (United States)

    Snyder, David B.; Wolford, David S.

    2012-01-01

    Calibration of standard sets of solar cell sub-cells is an important step to laboratory verification of on-orbit performance of new solar cell technologies. This paper, looks at the potential capabilities of a lightweight weather balloon payload for solar cell calibration. A 1500 gr latex weather balloon can lift a 2.7 kg payload to over 100,000 ft altitude, above 99% of the atmosphere. Data taken between atmospheric pressures of about 30 to 15 mbar may be extrapolated via the Langley Plot method to 0 mbar, i.e. AMO. This extrapolation, in principle, can have better than 0.1 % error. The launch costs of such a payload arc significantly less than the much larger, higher altitude balloons, or the manned flight facility. The low cost enables a risk tolerant approach to payload development. Demonstration of 1% standard deviation flight-to-flight variation is the goal of this project. This paper describes the initial concept of solar cell calibration payload, and reports initial test flight results. .

  10. Unilateral versus bilateral percutaneous kyphoplasty in treating osteoporotic vertebral compression fractures:A systematic review and meta-analysis%对比单双侧椎体后凸成形术治疗骨质疏松性椎体压缩性骨折的Meta分析

    Institute of Scientific and Technical Information of China (English)

    孙晗; 杨惠林; 孙佳佳; 刘义杰; 杨旭; 孙思炜; 周峰; 孟斌

    2015-01-01

    ObjectiveThe objective of this study was to compare the efficacy and safety of unipedicular kyphoplasty and bipedicular kyphoplasty in treating ostcoporotic vertebralcoression fractures (OVCFs) using Meta-analysis.MethodsStudies comparing between unilateral kyphoplasty and bilateral kyphoplasty in treating OVCFs with randomized controlled trials were searched systematically in PubMed MEDLINE, EMBASE, Web of Science, and Cochrane Library, from January 1990 to June 2015. The work of screening, inclusion of articles and data extraction were performed by two researchers independently. The RevMan 5.3 programme was used to carry out the meta-analysis.ResultsSix articles with 563 patients were enrolled in this study. The results showed that the unilateral approach possessed less surgery time (MD:-23.19; 95%CI:-27.08~-19.31;P<0.001) and cement consumption (MD:-2.07; 95%CI:-2.23~-1.91;P<0.001), as well as less cement leakage ratio (RR:0.59; 95%CI: 0.35~ 0.99;P<0.05). No significant differences were found in the visual analog scale score (short-term and long-term), Oswestry disability index score (mid-term and long-term), kyphotic angle reduction, restoration rate of anterior vertebral height, vertebral height loss rate, and postoperative adjacent-level fractures. ConclusionBoth unilateral kyphoplasty and bilateral kyphoplasty are safety and effective selections for OVCFs. However, unilateral kyphoplasty may be more recommended considering that it has the advantage of shorter operation time, lower cement leakage rate, less cement usage and radiation dose.%目的:利用Meta分析的方法评价单侧与双侧入路经皮椎体后凸成形术治疗骨质疏松性椎体压缩性骨折的疗效和安全性。方法采用了PubMed MEDLINE、EMBASE、Web of Science及Cochrane Library等互联网搜索引擎作为检索工具,系统检索了从1900年1月至2015年7月有关比较单侧与双侧入路经皮椎体后凸成形术治疗骨质疏松性椎体压缩性骨折的文

  11. Imaging Sunlit Aurora from Balloon

    Science.gov (United States)

    Lummerzheim, D.; Zhou, X.

    2012-12-01

    Since 1892 when aurora was first imaged by Martin Brendel, useful auroral images have been obtained only when the aurora is in darkness. While UV imagers onboard satellite provide global auroral dynamics, the sunlit aurora in the UV band is overwhelmed by the UV airglow that has the same wavelengths with the UV auroral emissions. The visible band imaging is feasible only when the aurora is in darkness to avoid the sunlight contamination. However, sunlit aurora (such as dayside aurora) is closely related to the solar wind - magnetosphere - ionosphere coupling. In addition, limited land area has badly restricted the capability of imaging dayside aurora from the northern hemisphere and nightside aurora from the southern hemisphere. We have confirmed that sunlit aurora can be imaged using a near-infrared (NIR) camera on board the balloon platform flying in Antarctica or Arctic. This method provides a unique capability for dayside and conjugate auroral investigations. Scientific questions that can be addressed by such observations include how does the dayside aurora respond to solar wind transient variations? Are auroras hemispherically symmetric? Are auroral forms and their variations under sunlight the same as those in darkness? etc. The new method is also cost effective comparing to space-borne imagers, and offers capabilities not obtainable from space and the ground. With the accomplishment of identifying auroral dynamics in sunlight and darkness, in the south and north simultaneously, our knowledge and understanding of auroral phenomenon and its causes will be expanded.

  12. Ballooning mode spectrum in general toroidal systems

    Energy Technology Data Exchange (ETDEWEB)

    Dewar, R.L.; Glasser, A.H.

    1982-04-01

    A WKB formalism for constructing normal modes of short-wavelength ideal hydromagnetic, pressure-driven instabilities (ballooning modes) in general toroidal magnetic containment devices with sheared magnetic fields is developed. No incompressibility approximation is made. A dispersion relation is obtained from the eigenvalues of a fourth order system of ordinary differential equations to be solved by integrating along a line of force. Higher order calculations are performed to find the amplitude equation and the phase change at a caustic. These conform to typical WKB results. In axisymmetric systems, the ray equations are integrable, and semiclassical quantization leads to a growth rate spectrum consisting of an infinity of discrete eigenvalues, bounded above by an accumulation point. However, each eigenvalue is infinitely degenerate. In the nonaxisymmetric case, the rays are unbounded in a four dimensional phase space, and semiclassical quantization breaks down, leading to broadening of the discrete eigenvalues and accumulation point of the axisymmetric case into continuum bands. Analysis of a model problem indicates that the broadening of the discrete eigenvalues is numerically very small, the dominant effect being broadening of the accumulation point.

  13. Percutaneous balloon valvuloplasty in mitral stenosis

    Energy Technology Data Exchange (ETDEWEB)

    Park, Jae Hyung; Oh, Byung Hee; Park, Kyung Ju; Kim, Seung Hyup; Lee, Young Woo; Han, Man Chung [Seoul National University College of Medicine, Seoul (Korea, Republic of)

    1989-02-15

    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{sup 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.

  14. Percutaneous gastrostomy performed by radiologists using balloon replacement tubes. A simple interventional technique for the placement of nutritional catheters without endoscopy or surgery; Perkutane Gastrostomie mit Ballon-PEG-Ersatzsonden durch den Radiologen. Eine interventionelle Technik zur einfachen Einlage von Ernaehrungskathetern ohne chirurgischen oder endoskopischen Eingriff

    Energy Technology Data Exchange (ETDEWEB)

    Dinkel, H.P.; Triller, J. [Bern Univ. (Switzerland). Inst. fuer Diagnostische Radiologie

    2001-06-01

    Patients afflicted with stenotic head and neck or esophageal tumors often require artificial enteral feeding. Frequently passage of an endoscope through the esophagus is impossible in these patients. Interventional, fluoroscopically assisted, percutaneous gastrostomy (PG) by balloon replacement tubes is a feasible and successful alternative to percutaneous endoscopic gastrostomy (PEG) and the method of choice in patients where the esophagus cannot be passed with an endoscope anymore. Technical success rate is very high and serious complications are rare. Radiological PG is a feasible, equivalent alternative to PEG also in all other patients. We recommend PG with balloon gastrostomy tubes in conjunction with gastropexy performed with three to four T-fasteners, which are left in place for seven days in order to prevent dislocation and leakage. (orig.) [German] Patienten mit HNO-Tumoren oder malignen Oesophagusstenosen muessen oft mit einem gastroenteralen Stoma versorgt werden. Haeufig sind die Tumoren so stenosierend, dass eine perkutane endoskopische Gastrostomie (PEG) nicht mehr moeglich ist und eine chirurgische Gastrostomie durchgefuehrt wird. Wir berichten ueber die radiologisch-perkutane Gastrostomie (PG). Die perkutane Gastrostomie ist Methode der Wahl bei stark stenosierenden oesophagealen Prozessen. Auch bei anderen Patienten (ohne Passagehindernis) stellt die PG eine gleichwertige Alternative zur PEG dar. Die Erfolgsrate der PG liegt nahe 100%, Komplikationen sind selten. Wir empfehlen Ballon-arretierte Sonden (sog. Ballonersatzsonden) in Verbindung mit der perkutanen Gastropexie mit 3-4 Fadenzugankern, die fuer etwa 7 Tage belassen werden. (orig.)

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

    Science.gov (United States)

    Fiszer, Roland; Szkutnik, Małgorzata; Smerdziński, Sebastian; Chodór, Beata; Białkowski, Jacek

    2016-01-01

    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. PMID:27625686

  16. COMPARISON OF EFFECTIVENESS BETWEEN KYPHOPLASTY AND CONSERVATIVE TREATMENT IN TREATING OSTEOPOROTIC VERTEBRAL FRACTURES%椎体后凸成形术与保守治疗骨质疏松性脊柱骨折的对比研究

    Institute of Scientific and Technical Information of China (English)

    林春阳; 遇呈祥; 陈亮; 柯珍勇; 邓忠良

    2011-01-01

    Objective To investigate the effectiveness of kyphoplasty in treating osteoporotic vertebral fracture according to comparative study. Methods Between March 2006 and August 2007, 60 patients with osteoporotic vertebral fractures were treated. Kyphoplasty was performed in 40 patients (test group) and conservative treatment was performed in 20 patients as control (control group). In test group, there were 6 males and 34 females with an average age of 68.7 years (range,56-78 years). The disease duration was 10-18 months (mean, 12 months). A total of 73 vertebral bodies fractured. In control group, there were 5 males and 15 females with an average age of 70.1 years (range, 57-80 years). The disease duration was 9-16 months (mean, 13 months). A total of 41 vertebral bodies fractured. There was no significant difference in the general data between 2 groups (P > 0.05). Results All incisions healed by first intention in test group, and no leakage of bone cement occurred. The patients of 2 groups were followed up 36-38 months. The visual analogue scale (VAS) scores, European Vertebral Osteoporosis Study (EVOS) questionnaire scores, anterior and middle vertebral column heights, and Cobb angles of test group at 1-3 days, 12 and 36 months after treatment were significantly improved when compared with those before operation (P < 0.05);but there was no significant difference between before treatment and after treatment in control group (P > 0.05). After 12 and 36 months, the VAS scores, EVOS scores, anterior and middle vertebral column heights, and Cobb angles of test group were better than those of control group (P < 0.05). The incidence of vertebral re-fractures was higher in control group than in test group after 36 months (x2=16.347, P=0.015). Conclusion Kyphoplasty can effectively relieve pain and restore the function after the procedure. The risk of vertebral re-fractures after kyphoplasty can be reduced in comparison with conservative treatment.%目的 通过临

  17. BLAST: A balloon-borne, large-aperture, submillimetre telescope

    Science.gov (United States)

    Wiebe, Donald Victor

    BLAST is a balloon-borne large-aperture, submillimetre telescope, which makes large area (1--200 square degree) surveys of Galactic and extragalactic targets. Since BLAST observes in the stratosphere, it is able to make broad-band observations between 200 mum and 550 mum which are difficult or impossible to perform from the ground. BLAST has been designed to probe star formation both in the local Galaxy and in the high redshift (z = 1--4) universe. Because BLAST is flown on an unmanned stratospheric balloon platform, it has been designed to be able to operate autonomously, without needing operator intervention to perform its scientific goals. This thesis includes an overview of the design of the BLAST platform, with emphasis on the command and control systems used to operate the telescope. BLAST has been flown on two long-duration balloon flights. The first of these, from Esrange, Sweden in June of 2005, acquired ˜70 hours of primarily Galactic data. During the second flight, from Willy Field, Antarctica in December of 2006, BLAST acquired ˜225 hours of both Galactic and extragalactic data. Operational performance of the platform during these two flights is reviewed, with the goal of providing insight on how future flights can be improved. Reduction of the data acquired by these large-format bolometer arrays is a challenging procedure, and techniques developed for BLAST data reduction are reviewed. The ultimate goal of this reduction is the generation of high quality astronomical maps which can be used for subsequent portions of data analysis. This thesis treats, in detail, the iterative, maximum likelihood map maker developed for BLAST. Results of simulations performed on the map maker to characterise its ability to reconstruct astronomical signals are presented. Finally, astronomical maps produced by this map maker using real data acquired by BLAST are presented, with a discussion on non-physical map pathologies resulting from the data reduction pipeline and

  18. Parallel wire balloon angioplasty for undilatable venous stenosis in hemodialysis fistula

    Energy Technology Data Exchange (ETDEWEB)

    Shin, Tae Beom; You, Jin Jong; Cho, Jae Min [Gyeongsang National University Hospital, Jinju (Korea, Republic of)] (and others)

    2007-05-15

    The purpose of this study was to assess the value of the parallel wire balloon angioplasty technique for treating dysfunctional hemdialysis fistula with rigid stenosis, and this type of lesion was resistant to conventional angioplasty. Between March 2002 and August 2003, we included 6 patients (mean age: 59, males: 2, females: 4) who were treated via parallel the wire balloon angioplasty technique and their hemodialysis fistula has stenoses that were resistant to conventional angioplasty. We performed conventional angioplasty in all patients, but we failed to achieve sufficient dilatation. In the cases of highly resistant stenosis, an additional 0.016 inch wire was inserted into the 7 F vascular sheath. During angioplasty, a 0.016 inch guide wire was inserted between the balloon and the stenosis and then it was pushed to and fro until the balloon indentation disappeared. After the procedure, we performed angiography to identify the residual stenosis and the procedure-related complications. The undilatable stenoses in 5 patients were successfully resolved without complications via the parallel wire angioplasty technique. In one patient, indentation of balloon was not resolved, but the residual stenosis was both minimal and hemodynamically insignificant. The parallel wire angioplasty technique seems to be a feasible and cost-effective method for treating a dysfunctional hemodialysis fistula with undilatable and rigid stenosis.

  19. Assessment of risk of carotid occlusion with balloon Matas testing and dynamic computed tomography

    Energy Technology Data Exchange (ETDEWEB)

    Terada, Tomoaki; Okuno, Takashi; Moriwaki, Hiroshi; Nakai, Ekini; Nishiguchi, Takashi; Hayashi, Seiji; Komai, Norihiko.

    1988-02-01

    Temporary occlusion of the internal carotid artery with a balloon catheter (balloon Matas test) and simultaneous dynamic computed tomographic scanning (DCT) were performed in four patients with intracranial aneurysms to determine their tolerance for permanent carotid occlusion. Five DCT parameters were evaluated: appearance time, peak time, peak height fitting, first effective moment, and transit time. The patients were characterized into three types: type I (2 patients) - lack of neurological deficit during the balloon Matas test and equally preserved cerebral blood flow (CBF) in the two hemispheres on DCT during carotid occlusion, type II (one patient) - a decreased CBF on the occluded side on DCT despite the lack of neurological deficit; type III (one patient) - neurological signs, such as disturbance of consciousness, aphasia, and right hemiparesis occuring immediately after the start of the balloon Matas test, and a decreased CBF in the region of the middle and anterior cerebral arteries on the occluded side. In the type III patient, occlusion of the internal carotid artery is contraindicated unless an EC-IC bypass procedure that can rapidly provide a large supply of blood is performed. It can be concluded that the balloon Matas/DCT method offers a reliable means of predicting the risk of carotid ligation. (Namekawa, K.).

  20. Balloon Flight Tests of a Gas-Ionization-Chamber-Based Isotope Spectrometer

    Science.gov (United States)

    Wiedenbeck, M. E.; Milliken, B.

    1995-01-01

    High resolution studies of the isotopic composition of heavy elements in the galactic cosmic radiation have been performed using satellites. The performance of the Tracking Heavy Isotope Spectrometer Telescopes for Low Energies (THISTLE) is investigated using data from a balloon flight carried out in 1993. The instrument design is discussed; and data, and additional analysis, is shown.

  1. Does Percutaneous Kyphoplasty Have Better Functional Outcome Than Vertebroplasty in Single Level Osteoporotic Compression Fractures? A Comparative Prospective Study

    Directory of Open Access Journals (Sweden)

    F. Omidi-Kashani

    2013-01-01

    Full Text Available Purpose. To evaluate the relative differences in surgical outcome of kyphoplasty (KP versus vertebroplasty (VP in the patients with single level refractory osteoporotic compression fractures (OCFs. Method. From August 2008 to May 2012, we intermittently treated 57 patients with single level OCF by PV and KP (Groups A and B, resp.. We used visual analogue scale (VAS and short form 36 (SF36 questionnaire to measure functional recovery and followed them for six months. Independent samples t- and Kendall’s tau-b tests were for statistics. Results. In terms of age, number, and bone mineral density of the patients, there were no significant differences between the two groups. In both groups, VAS and SF-36 scores improved significantly and remained relatively stable throughout the follow-up period. We had 9 and 6 asymptomatic cement extravasations and 5 and 8 new vertebral fractures in Group A and B, respectively. In comparing the two groups, the results indicated that KP almost failed to show any significant higher effect relative to VP during this period. Conclusions. In considering the high cost of KP relative to VP in the developing countries like Iran, there is no logical reason to use KP in a single level refractory OCF in these regions.

  2. Japan-Indo collaboration on balloon observations

    Science.gov (United States)

    Makino, Fumiyoshi

    Japan-Indo collaboration on balloon observations of cosmic X-ray sources was started in 1969 by the late S. Hayakawa of Nagoya Univ. and B. V. Sreekantan of TIFR. Cosmic background X-ray and soft gamma-ray spectra, simultaneous X-ray and optical flux variation, and size of X-ray emitting region of Crab Nebula were observed successfully by balloon flights at Hyderabad in 1969-1975. H. Shibai of Nagoya Univ. and T. N. Rengarajan of TIFR have organized collaboration on far infrared sky survey at wavlength of 150 micron emitted from CII. By employing improved detectors, CII distribution of Orion Nebula has been obtained in good accuracy by more than ten balloon flights in 1999-2008.

  3. Near ultraviolet spectrograph for balloon platform

    Science.gov (United States)

    Sreejith, A. G.; Safonova, Margarita; Murthy, Jayant

    2015-06-01

    Small and compact scientific payloads may be easily designed constructed and own on high altitude balloons. Despite the fact that large orbital observatories provide accurate observations and statistical studies of remote and/or faint space sources, small telescopes on board balloons or rockets are still attractive because of their low cost and rapid response time. We describe here a near ultraviolet (NUV) spectrograph designed to be own on a high{altitude balloon platform. Our basic optical design is a modified Czerny-Turner system using off the shelf optics. We compare different methods of aberration corrections in such a system. We intend the system to be portable and scalable to different telescopes. The use of reflecting optics reduces the transmission loss in UV. We plan on using an image intensified CMOS sensor operating in photon counting mode as the detector of choice.

  4. 75 FR 33838 - National Environmental Policy Act; Scientific Balloon Program

    Science.gov (United States)

    2010-06-15

    ... SPACE ADMINISTRATION National Environmental Policy Act; Scientific Balloon Program AGENCY: National... Draft Programmatic Environmental Assessment (PEA) and Draft Finding of No Significant Impact (FONSI) for NASA's Scientific Balloon Program. SUMMARY: Pursuant to the National Environmental Policy Act of...

  5. β-IRRADIATION WITH A LIQUID 188Re-FILLED BALLOON PREVENTS NEOINTIMAL PROLIFERATION IN THE CAROTID OF RABBIT

    Institute of Scientific and Technical Information of China (English)

    朱建国; 崔长琮; 崔翰斌; 胡国英; 马爱群; 王东琦; 付文

    2002-01-01

    Objective To evaluate the role of β-irradiatio n with a liquid 188Re-filled balloon for limiting neointimal prolifer ation. Methods Balloon-overstretched injury was performed in the rabb it carotid artery, then β-irradiation using the liquid 188Re-filled balloon was followed immediately, and the prescribed doses was 0, 15Gy or 20Gy a t 0.5mm from the surface of vessel. All animals survived and were sacrificed at three weeks. Histopathologic analysis was performed. Results In the control group, the neointimal area was larger ( 0.40±0.04)mm2, as compared with (0.23±0.06)mm2 of the 15Gy irradiated g roup and (0.15±0.02)mm2 in the 20Gy group (P<0.05). Conclusion The β-irradiation with a liquid 188Re-f illed balloon is safe and effective.

  6. 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.

  7. Particle Astrophysics in NASA's Long Duration Balloon Program

    CERN Document Server

    Gorham, Peter W

    2013-01-01

    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.

  8. There is a Text in 'The Balloon'

    DEFF Research Database (Denmark)

    Elias, Camelia

    2009-01-01

    From the Introduction: Camelia Elias' "There is a Text in 'The Balloon': Donald Barthelme's Allegorical Flights" provides its reader with a much-need and useful distinction between fantasy and the fantastic: "whereas fantasy in critical discourse can be aligned with allegory, in which a supernatu......From the Introduction: Camelia Elias' "There is a Text in 'The Balloon': Donald Barthelme's Allegorical Flights" provides its reader with a much-need and useful distinction between fantasy and the fantastic: "whereas fantasy in critical discourse can be aligned with allegory, in which...

  9. Cutting balloon angioplasty for intrastent restenosis treatment

    Directory of Open Access Journals (Sweden)

    João Orávio de Freitas Jr

    1999-05-01

    Full Text Available We describe here two patients with angiographic diagnosis of intrastent restenosis and regional myocardial ischemia. One stent restenosis was located in a native coronary artery and the other in a vein graft. Both were treated with cutting balloon angioplasty (CBA, inflated at low pressures. Angiographic success was obtained and both patients were discharged in the day after the procedure. Cutting balloon angioplasty using low inflation pressures achieved important luminal gains, in these two cases of intrastent restenosis. Further studies are necessary before the effectiveness of this procedure can be precisely defined.

  10. On the inflation of a rubber balloon

    Science.gov (United States)

    Vandermarlière, Julien

    2016-12-01

    It is a well-known fact that it is difficult to start a balloon inflating. But after a pressure peak that occurs initially, it becomes far easier to do it! The purpose of this article is to establish the experimental pressure-radius chart for a rubber balloon and to compare it to the theoretical one. We will demonstrate that the barometer of a smartphone is a very suitable tool to reach this goal. We hope that this phenomenon will help students realize that sometimes very simple questions can lead to very interesting and counterintuitive science.

  11. High altitude balloon experiments at IIA

    Science.gov (United States)

    Nayak, Akshata; Sreejith, A. G.; Safonova, Margarita; Murthy, Jayant

    Recent advances in balloon experiments as well as in electronics have made it possible to fly scientific payloads at costs accessible to university departments. We have begun a program of high altitude ballooning at the Indian Institute of Astrophysics, Bengaluru. The primary purpose of this activity is to test low-cost ultraviolet (UV) payloads for eventual space flight, but we will also try scientific exploration of the phenomena occurring in the upper atmosphere, including sprites and meteorite impacts. We present the results of the initial experiments carried out at the CREST campus of IIA, Hosakote, and describe our plans for the future.

  12. 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.

  13. Pointing System for the Balloon-Borne Astronomical Payloads

    CERN Document Server

    Nirmal, K; Mathew, Joice; Sarpotdar, Mayuresh; Suresh, Ambily; Prakash, Ajin; Safonova, Margarita; Murthy, Jayant

    2016-01-01

    We describe the development and implementation of a light-weight, fully autonomous 2-axis pointing and stabilization system designed for balloon-borne astronomical payloads. The system is developed using off-the-shelf components such as Arduino Uno controller, HMC 5883L magnetometer, MPU-9150 Inertial Measurement Unit (IMU) and iWave GPS receiver unit. It is a compact and rugged system which can also be used to take images/video in a moving vehicle, or in areal photography. The system performance is evaluated from the ground, as well as in conditions simulated to imitate the actual flight by using a tethered launch.

  14. Pointing system for the balloon-borne astronomical payloads

    Science.gov (United States)

    Nirmal, Kaipacheri; Sreejith, Aickara Gopinathan; Mathew, Joice; Sarpotdar, Mayuresh; Ambily, Suresh; Prakash, Ajin; Safonova, Margarita; Murthy, Jayant

    2016-10-01

    We describe the development and implementation of a light-weight, fully autonomous 2-axis pointing and stabilization system designed for balloon-borne astronomical payloads. The system is developed using off-the-shelf components such as Arduino Uno controller, HMC 5883L magnetometer, MPU-9150 inertial measurement unit, and iWave GPS receiver unit. It is a compact and rugged system which can also be used to take images/video in a moving vehicle or in real photography. The system performance is evaluated from the ground, as well as in conditions simulated to imitate the actual flight by using a tethered launch.

  15. 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

  16. Auditory Risk of Exploding Hydrogen-Oxygen Balloons

    Science.gov (United States)

    Gee, Kent L.; Vernon, Julia A.; Macedone, Jeffrey H.

    2010-01-01

    Although hydrogen-oxygen balloon explosions are popular demonstrations, the acoustic impulse created poses a hearing damage risk if the peak level exceeds 140 dB at the listener's ear. The results of acoustical measurements of hydrogen-oxygen balloons of varying volume and oxygen content are described. It is shown that hydrogen balloons may be…

  17. 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.

  18. 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...

  19. Experiments with Helium-Filled Balloons

    Science.gov (United States)

    Zable, Anthony C.

    2010-12-01

    The concepts of Newtonian mechanics, fluids, and ideal gas law physics are often treated as separate and isolated topics in the typical introductory college-level physics course, especially in the laboratory setting. To bridge these subjects, a simple experiment was developed that utilizes computer-based data acquisition sensors and a digital gram scale to estimate the molar mass of the gas in an inflated balloon. In this experiment, the comparable density of an inflated balloon to that of atmospheric air introduces a significant role for buoyancy that must be accounted for. The ideal gas law approximation is assumed for both the isolated gas mixture within the balloon and the surrounding air, which defines the relationship between the gas pressure, volume, temperature, and molar quantity. Analysis of the forces associated with the inflated balloon with the incorporation of Archimedes' principle and the ideal gas law into Newton's second law results in an experimental method for the measurement of the molar mass and mole fraction of a gas that is easy to implement yet academically challenging for students. The following narrative describes the basic setup of this experiment, along with a sample set of data as acquired and analyzed by a typical physics student from one of my classes.

  20. Pumpkins and onions and balloon design

    Science.gov (United States)

    Winker, J. A.

    The reach for a capability to make long flights (months) with heavy payloads (tonnes) has long been pursued. The closest we have come is with polar flights devoid of a significant diurnal cycle. Superpressure technology, with its ability to survive diurnal cycles, is an obvious choice, but materials limitations have been an obstacle to realizing these ambitious goals. Now comes an assortment of new synthetic materials, coupled with a special variety of superpressure balloon which, in combination, is poised to yield a solution for our enhanced duration/payload quest. In this paper we are looking not at materials, but only at a balloon concept. This concept is a "natural shape" oblate spheroid balloon whose shape is chosen to exploit properties of component materials, particularly newly available ones. The current variation of this concept is called a "pumpkin" balloon. The most visible work on this shape is that done by France's CNES, Japan's ISAS, and in the USA by NASA's Wallops Flight Facility. But the basic design idea is not new; it extends back at least a half century. This paper traces the origins of the shape, its evolution through various iterations, and it speculates on some of the recent thinking regarding construction details.

  1. A balloon-borne millimeter-wave telescope for cosmic microwave background anisotropy measurements

    CERN Document Server

    Fixsen, D J; Cottingham, D A; Folz, W C; Inman, C A; Kowitt, M S; Meyer, S; Page, L A; Puchalla, J L; Ruhl, J E; Silverberg, R F

    1995-01-01

    We report on the characteristics and design details of the Medium Scale Anisotropy Measurement (MSAM), a millimeter-wave, balloon-borne telescope that has been used to observe anisotropy in the Cosmic Microwave Background Radiation (CMBR) on 0\\fdg5 angular scales. The gondola is capable of determining and maintaining absolute orientation to a few arcminutes during a one-night flight. Emphasis is placed on the optical and pointing performance as well as the weight and power budgets. We also discuss the total balloon/gondola mechanical system. The pendulation from this system is a ubiquitous perturbation on the pointing system. A detailed understanding in these areas is needed for developing the next generation of balloon-borne instruments.

  2. The pGAPS experiment: an engineering balloon flight of prototype GAPS

    CERN Document Server

    Fuke, Hideyuki; Aramaki, Tsuguo; Bando, Nobutaka; Boggs, Steven E; Doetinchem, Philip v; Gahbauer, Florian H; Hailey, Charles J; Koglin, Jason E; Madden, Norm; Mognet, Samuel Adam I; Mori, Kaya; Okazaki, Shun; Perez, Kerstin M; Yoshida, Tetsuya; Zweerink, Jeffrey

    2013-01-01

    The General Anti-Particle Spectrometer (GAPS) project is being carried out to search for primary cosmic-ray antiparticles especially for antideuterons produced by cold dark matter. GAPS plans to realize the science observation by Antarctic long duration balloon flights in late 2010's. In preparation for the Antarctic science flights, an engineering balloon flight using a prototype of the GAPS instrument, "pGAPS", was successfully carried out in June 2012 in Japan to verify the basic performance of each GAPS subsystem. The outline of the pGAPS flight campaign is briefly reported.

  3. Stratospheric Balloon Platforms for Near Space Access

    Science.gov (United States)

    Dewey, R. G.

    2012-12-01

    For over five decades, high altitude aerospace balloon platforms have provided a unique vantage point for space and geophysical research by exposing scientific instrument packages and experiments to space-like conditions above 99% of Earth's atmosphere. Reaching altitudes in excess of 30 km for durations ranging from hours to weeks, high altitude balloons offer longer flight durations than both traditional sounding rockets and emerging suborbital reusable launch vehicles. For instruments and experiments requiring access to high altitudes, engineered balloon systems provide a timely, responsive, flexible, and cost-effective vehicle for reaching near space conditions. Moreover, high altitude balloon platforms serve as an early means of testing and validating hardware bound for suborbital or orbital space without imposing space vehicle qualifications and certification requirements on hardware in development. From float altitudes above 30 km visible obscuration of the sky is greatly reduced and telescopes and other sensors function in an orbit-like environment, but in 1g. Down-facing sensors can take long-exposure atmospheric measurements and images of Earth's surface from oblique and nadir perspectives. Payload support subsystems such as telemetry equipment and command, control, and communication (C3) interfaces can also be tested and operationally verified in this space-analog environment. For scientific payloads requiring over-flight of specific areas of interests, such as an active volcano or forest region, advanced mission planning software allows flight trajectories to be accurately modeled. Using both line-of-sight and satellite-based communication systems, payloads can be tracked and controlled throughout the entire mission duration. Under NASA's Flight Opportunities Program, NSC can provide a range of high altitude flight options to support space and geophysical research: High Altitude Shuttle System (HASS) - A balloon-borne semi-autonomous glider carries

  4. Management of life-threatening celiac-hepatic arterial hemorrhage after pancreaticoduodenectomy: usefulness of temporary balloon occlusion

    Institute of Scientific and Technical Information of China (English)

    WANG Mao-qiang; GUO Li-ping; LIN Han-ying; DUAN Feng; LIU Feng-yong; WANG Zhi-jun

    2011-01-01

    When a large visceral artery is ruptured,uncontrolled bleeding may lead to hemodynamic collapse.Use of endovascular occlusion balloon catheter may provide rapid control of hemorrhage and facilitate definitive therapy.We reported two patients with massive hemorrhage from ruptured celiac-hepatic artery after pancreaticoduodenectomy,who were initially treated percutaneously by temporary selective balloon occlusion.They became critically hemodynamic unstable during the angiographic procedure.Through an 8Fr sheath,a 6Fr compliant latex occlusion balloon was placed proximal to the celiac trunk and inflated,and upon patient stabilization surgical revision and stent-graft placement were successfully performed in the two patients,respectively.Temporary selective balloon occlusion provides fast and effective bleeding control for patient with critically uncontrollable visceral arterial hemorrhage,permitting subsequent use of conventional techniques for management of the arterial bleeding source.

  5. 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.

  6. Measurements of gondola motion on a stratospheric balloon flight

    CERN Document Server

    Safonova, Margarita; Sreejith, A G; Sarpotdar, Mayuresh; Ambily, S; Prakash, Ajin; Mathew, Joice; Murthy, Jayant; Anand, Devarajan; Kapardhi, B V N; Kumar, B Suneel; Kulkarni, P M

    2016-01-01

    Balloon experiments are an economically feasible method of conducting observations in astronomy that are not possible from the ground. The astronomical payload may include a telescope, a detector, and a pointing/stabilization system. Determining the attitude of the payload is of primary importance in such applications, to accurately point the detector/telescope to the desired direction. This is especially important in generally unstable lightweight balloon flights. However, the conditions at float altitudes, which can be reached by zero pressure balloons, could be more stable, enabling accurate pointings. We have used the Inertial Measurement Unit (IMU), placed on a stratospheric zero pressure balloon, to observe 3-axis motion of a balloon payload over a fight time of 4.5 hours, from launch to the float altitude of 31.2 km. The balloon was launched under nominal atmospheric conditions on May 8th 2016, from a Tata Institute of Fundamental Research Balloon Facility, Hyderabad.

  7. 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.

  8. The Balloon-borne Large Aperture Submillimeter Telescope: BLAST

    Science.gov (United States)

    Truch, Matthew D. P.; Ade, P. A. R.; Bock, J. J.; Chapin, E. L.; Chung, J.; Devlin, M. J.; Dicker, S.; Griffin, M.; Gundersen, J. O.; Halpern, M.; Hargrave, P. C.; Hughes, D. H.; Klein, J.; MacTavish, C. J.; Marsden, G.; Martin, P. G.; Martin, T. G.; Mauskopf, P.; Netterfield, C. B.; Olmi, L.; Pascale, E.; Patanchon, G.; Rex, M.; Scott, D.; Semisch, C.; Thomas, N. E.; Tucker, C.; Tucker, G. S.; Viero, M. P.; Wiebe, D. V.

    2009-01-01

    The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) is a suborbital surveying experiment designed to study the evolutionary history and processes of star formation in local galaxies (including the Milky Way) and galaxies at cosmological distances. The BLAST continuum camera, which consists of 270 detectors distributed between three arrays, observes simultaneously in broadband (30%) spectral windows at 250, 350, and 500 microns. The optical design is based on a 2 m diameter telescope, providing a diffraction-limited resolution of 30" at 250 microns. The gondola pointing system enables raster mapping of arbitrary geometry, with a repeatable positional accuracy of 30"; postflight pointing reconstruction to manual override. On this poster, we describe the primary characteristics and measured in-flight performance of BLAST. BLAST performed a test flight in 2003 and has since made two scientifically productive long-duration balloon flights: a 100 hour flight from ESRANGE (Kiruna), Sweden to Victoria Island, northern Canada in 2005 June; and a 250 hour, circumpolar flight from McMurdo Station, Antarctica in 2006 December. The BLAST collaboration acknowledges the support of NASA through grants NAG5-12785, NAG5-13301, and NNGO-6GI11G, the Canadian Space Agency (CSA), the Science and Technology Facilities Council (STFC), Canada's Natural Sciences and Engineering Research Council (NSERC), the Canada Foundation for Innovation, the Ontario Innovation Trust, the Puerto Rico Space Grant Consortium, the Fondo Institucional para la Investigacion of the University of Puerto Rico, and the National Science Foundation Office of Polar Programs.

  9. Rubber Balloons, Buoyancy and the Weight of Air: A Look Inside

    Science.gov (United States)

    Calza, G.; Gratton, L. M.; Lopez-Arias, T.; Oss, S.

    2009-01-01

    We discuss three methods of measuring the density of air most commonly used in a teaching context. Emphasis is put on the advantages and/or difficulties of each method. In particular, we show that the 'rubber balloon' method can still be performed with meaningful physical insight, but it requires a very careful approach. (Contains 4 figures and 3…

  10. 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 ass

  11. Report on the Activities of National Balloon Facility, Hyderabad

    Science.gov (United States)

    Vasudevan, Rajagopalan; Sreenivasan, S.; Suneel Kumar, B.; Kulkarni, P. M.

    2012-07-01

    More than five and half decades back, the Indian Balloon Group at Tata Institute of Fundamental Research, Mumbai started development of stratospheric zero pressure balloon technology and today it is one among the leading balloon groups in the world. For the past 40 years, the Institute has been operating a Scientific Balloon Facility at Hyderabad and carried out 478 balloon flights for various disciplines of space sciences like primary cosmic ray studies, X ray, Gamma Ray, Infra Red Astronomies and Atmospheric science maintaining 100% success rate during the past nine years. The Balloon Facility has the capability to build balloons of volume up to 750,000 Cu.M. as well as carrying out R & D in all aspects of scientific ballooning like balloon engineering, balloon material development, general and flight support instrumentation. A continued effort in R & D for ultra thin balloon material for High Altitude Sounding Flights has resulted in lowering the thickness of the proven indigenous Antrix film initially from 6 to 3.8 microns in the first phase and further reduction to 2.7 microns in the second phase. A test balloon of volume 5000 Cu.M. using the 2.7 micron film attained a record altitude of 45.0 Km. amsl with 1 Kg. GPS sonde payload. A 60,000 Cu.M. balloon fabricated out of 3.8 micron film capable of reaching 47 Km. Altitude with 10 Kg. Payload is awaiting trial. This report briefly describes our balloon activities during the past two years. In atmospheric sciences, aerosol studies were made with OPC,QCM,Aethelometer, Nephelometer,MWR, CIMEL Sun Photometer and Raman LIDAR.Measuments of vertical profile of Meteorological parameters and ozone upto stratosphere using GPS Radiosonde and Ozone sonde is made respectively.Study of Ionospheric tomography is done with CADI and CRABEX.

  12. Healing after arterial dilatation with radiofrequency thermal and nonthermal balloon angioplasty systems.

    Science.gov (United States)

    Kaplan, J; Barry, K J; Connolly, R J; Nardella, P C; Hayes, L L; Lee, B I; Waller, B F; Becker, G J; Callow, A D

    1993-01-01

    Thermal balloon angioplasty has been proposed as a means of reducing acute and delayed reclosure of arteries after percutaneous transluminal balloon angioplasty. A radiofrequency (rf) balloon catheter was used to perform thermal balloon angioplasty on canine arteries in vivo. The histologic appearance of rf-treated sites was compared with that of control sites treated by conventional percutaneous transluminal angioplasty. Acutely, rf-treated sites showed a reduced medial cellularity with preservation of internal elastic lamina except at the transitional zone between thermal injury and normal artery, where localized internal elastic lamina disruption was found. Nonthermal sites showed generalized disruption of internal elastic lamina and normal medial cellularity. Both thermal and nonthermal sites displayed a return of intimal cover commencing at 1 to 2 weeks and completed by 4 weeks. Diffuse myointimal hyperplasia appeared by 2 weeks after injury at breaks in the internal elastic lamina along the nonthermal vessels but was localized to the transitional zone in thermal injury sites. In rf-treated vessels, repopulation of the acellular thermally modified media had commenced by 4 weeks, and by 8 weeks the media was diffusely repopulated by spindle-shaped cells resembling smooth muscle cells lying between and aligned with preserved connective tissue laminae. Overall, the distribution and extent of the proliferative response after rf thermal balloon angioplasty were less than those seen after nonthermal balloon angioplasty. Thermal sites, which underwent reintimalization before medial cells returned, were considerably less prone to the development of myointimal hyperplasia. These results suggest that this modality may have beneficial effects on arterial healing after angioplasty.

  13. Effect of low-grade conductive heating on vascular compliance during in vitro balloon angioplasty.

    Science.gov (United States)

    Mitchel, J F; Fram, D B; Aretz, T A; Gillam, L D; Woronick, C; Waters, D D; McKay, R G

    1994-07-01

    Radiofrequency-powered, thermal balloon angioplasty is a new technique that enhances luminal dilatation with less dissection than conventional angioplasty. The purpose of this study was to assess the effect of radiofrequency heating of balloon fluid on the pressure-volume mechanics of in vitro balloon angioplasty and to determine the histologic basis for thermal-induced compliance changes. In vitro, radiofrequency-powered, thermal balloon angioplasty was performed on 46 paired iliac segments freshly harvested from 23 nonatherosclerotic pigs. Balloon inflations at 60 degrees C were compared to room temperature inflations in paired arterial segments. Intraballoon pressure and volume were recorded during each inflation as volume infusion increased pressure over a 0 to 10 atm range. Pressure-volume compliance curves were plotted for all dilatations. Six segments were stained to assess the histologic abnormalities associated with thermal compliance changes. Radiofrequency heating acutely shifted the pressure-volume curves rightward in 20 of 23 iliac segments compared to nonheated controls. This increase in compliance persisted after heating and exceeded the maximum compliance shift caused by multiple nonheated inflations in a subset of arterial segments. Histologically, heated segments showed increased thinning and compression of the arterial wall, increased medial cell necrosis and altered elastic tissue fibers compared to nonheated specimens. In conclusion, radiofrequency heating of intraballoon fluid to 60 degrees C acutely increases vascular compliance during in vitro balloon angioplasty of nonatherosclerotic iliac arteries. The increased compliance persists after heating and can be greater than the compliance shifts induced by multiple conventional dilatations. Arterial wall thinning and irreversible alteration of elastic tissue fibers probably account for thermal compliance changes.

  14. 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.

  15. Background Measurements from Balloon-Borne CZT Detectors

    CERN Document Server

    Jenkins, J A; Grindlay, J E; Bloser, P F; Stahle, C K; Parker, B; Barthelmy, S D; Jenkins, Johnathan A; Narita, Tomohiko; Grindlay, Jonathan E.; Bloser, Peter F.; Stahle, Carl; Parker, Brad; Barthelmy, Scott

    2002-01-01

    We report detector characteristics and background measurements from two prototype imaging CZT detectors flown on a scientific balloon payload in May 2001. The detectors are both platinum-contact 10mm x 10mm x 5mm CZT crystals, each with a 4 $\\times$ 4 array of pixels tiling the anode. One is made from IMARAD horizontal Bridgman CZT, the other from eV Products high-pressure Bridgman material. Both detectors were mounted side-by-side in a flip-chip configuration and read out by a 32-channel IDE VA/TA ASIC preamp/shaper. We enclosed the detectors in the same 40deg field-of-view collimator (comprisinga graded passive shield and plastic scintillator) used in our previously-reported September 2000 flight. I-V curves for the detectors are diode-like, and we find that the platinum contacts adhere significantly better to the CZT surfaces than gold to previous detectors. The detectors and instrumentation performed well in a 20-hour balloon flight on 23/24 May 2001. Although we discovered a significant instrumental back...

  16. Global stability of the ballooning mode in a cylindrical model

    Science.gov (United States)

    Mazur, N. G.; Fedorov, E. N.; Pilipenko, V. A.

    2013-07-01

    Ballooning disturbances in a finite-pressure plasma in a curvilinear magnetic field are described by the system of coupled equations for the Alfvén and slow magnetosonic modes. In contrast to most previous works that locally analyzed the stability of small-scale disturbances using the dispersion relationship, a global analysis outside a WKB approximation but within a simple cylindrical geometry, when magnetic field lines are circles with constant curvature, is performed in the present work. This model is relatively simple; nevertheless, it has the singularities necessary for the formation of the ballooning mode: field curvature and non-uniform thermal plasma pressure. If the disturbance finite radial extent is taken into account, the instability threshold increases as compared to a WKB approximation. The simplified model used in this work made it possible to consider the pattern of unstable disturbances at arbitrary values of the azimuthal wavenumber ( k y ). Azimuthally large-scale disturbances can also be unstable, although the increment increases with decreasing azimuthal scale and reaches saturation when the scales are of the order of the pressure nonuniformity dimension.

  17. 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.

  18. 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...

  19. Balloon-borne CALET prototype payload (bCALET)

    Science.gov (United States)

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

    The CALorimetric Electron Telescope (CALET) payload will be installed in the Japanese Experiment Module Exposed Facility (JEM-EF) of the International Space Station (ISS). We have been developing a balloon borne payload to evaluate the performance of CALET by carring out precursor flights for the electron observation in 1-1000 GeV. The first flight of bCALET was done in 2006, and the enhanced version, bCALET-2, was successfully flown in 2009. In this paper, we describe the bCALET-3 payload which is composed of Imaging Calorimeter (IMC), Total Absorption Calorimeter (TASC) and Silicon pixel Array (SIA). IMC has an area of 320mm × 320mm, and is consisted 8 x-y layers of scintillating fiber belts inserted below tungsten plates for a fine imaging of shower particles. TASC is constructed by 6 layers of BGO scintillator blocks with an area of 300mm × 300mm, for measuring the total energy deposit of incoming shower particles. SIA owns to measure the charge number of incoming particle. Each component has very similar function with CALET with about half the area of CALET. We are planning to carry out the balloon experiment by bCALET-3 in November, 2010 for the test of the CALET capability of observing the electrons.

  20. Balloon-borne gamma-ray polarimetry

    CERN Document Server

    Pearce, Mark

    2011-01-01

    The physical processes postulated to explain the high-energy emission mechanisms of compact astrophysical sources often yield polarised soft gamma rays (X-rays). PoGOLite is a balloon-borne polarimeter operating in the 25-80 keV energy band. The polarisation of incident photons is reconstructed using Compton scattering and photoelectric absorption in an array of phoswich detector cells comprising plastic and BGO scintillators, surrounded by a BGO side anticoincidence shield. The polarimeter is aligned to observation targets using a custom attitude control system. The maiden balloon flight is scheduled for summer 2011 from the Esrange Space Centre with the Crab and Cygnus X-1 as the primary observational targets.

  1. Burn Injury Arise From Flying Balloon Toys

    OpenAIRE

    Yalcin Kulahci; Fatih Zor; Mehmet Bozkurt; Serdar Ozturk; Mustafa Sengezer

    2007-01-01

    Many of peoples are faced minor or major burn injuries in their life. Even the most widespread burn cause is flame injuries, too different burn cause pointed out in literature like Acetylen burns. The cases which imply in literature, mostly causes from explosion of high pressure acetylene tube, metal oxygene patch flame or carbide lamp using from cave explorers. An interesting acetylene burn cause in Turkey was publised by the authors. This cases was to come into being from flying toy balloon...

  2. MAXIS Balloon Observations of Electron Microburst Precipitation

    Science.gov (United States)

    Millan, R. M.; Hunter, A. E.; McCarthy, M. P.; Lin, R. P.; Smith, D. M.

    2003-12-01

    Quantifying and understanding losses is an integral part of understanding relativistic electron variability in the radiation belts. SAMPEX observations indicate that electron microburst precipitation is a major loss mechanism during active periods; the loss of relativistic electrons during a six hour period due to microburst precipitation was recently estimated to be comparable to the total number of trapped electrons in the outer zone (Lorentzen et al., 2001). Microburst precipitation was first observed from a balloon (Anderson and Milton, 1964), but these early measurements were only sensitive to MAXIS 2000 long duration balloon campaign. MAXIS was launched from McMurdo Station in Antarctica carrying a germanium spectrometer, a BGO scintillator and two X-ray imagers designed to measure the bremsstrahlung produced by precipitating electrons. The balloon circumnavigated the south pole in 18 days covering magnetic latitudes ranging from 58o-90o South. During the week following a moderate geomagnetic storm (with Dst reaching -91 nT), MAXIS detected a total of over 16 hours of microburst precipitation. We present high resolution spectra obtained with the MAXIS germanium spectrometer which allow us to determine the precipitating electron energy distribution. The precipitating distribution will then be compared to the trapped distribution measured by the GPS and LANL satellites. We also examine the spatial distribution of the precipitation.

  3. 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.

  4. 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.

  5. Combining Undergraduate Student Curriculum, Research, and Outreach: High-altitude Balloon and Rockets

    Science.gov (United States)

    Davis, E. J.; Nielsen, K.

    2015-12-01

    The Society of Physics Students chapter at Utah Valley University (UVU) recently established a high altitude balloon project to provide students with research opportunities. This highly successful program involves students not only from physics but also from other STEM fields and non-STEM subjects, and as such acts as a unique outreach program for the department of physics. Examples of experiments performed with the balloon project are: 3D-acceleration measurements, altitude/pressure/temperature measurements, ozone monitoring, bio-aerosol collection, and solar panel performance output. All these experiment are designed and build by groups of students either as part of research projects or through class participation as the projects link with the curriculum in several courses. Most recently, a group of UVU students have initiated the implementation of small rockets capable of carrying payloads to this high-altitude program. Both balloon and rocket platforms are fundamental in-situ measuring techniques for numerous geoscience subjects, and are arguably best illustrated by the NASA balloon and sounding rocket programs. In this presentation, we give an overview of the program and how it is 1) being implemented into the curriculum, 2) provide unique research opportunities for students, and 3) specific outreach activities.

  6. 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.

  7. Improving uv resistance of high strength fibers used in large scientific balloons

    Science.gov (United States)

    Said, M.; Gupta, A.; Seyam, A.; Mock, G.; Theyson, T.

    For the last three decades, NASA has been involved in the development of giant balloons that are capable of lifting heavy payloads of equipment (such as large telescopes and scientific instruments) to the upper atmosphere. While the use of such balloons has led to scientific discoveries, the demand for competitive science payloads and observational programs continues to rise. The NASA Balloon Program Office has entered a new phase of research to develop an Ultra Long Duration Balloon (ULDB) that will lift payloads of up to 3,600 kg to altitudes of up to 40 km. The flight duration is targeted to ranges between 30 to 100 days. Attaining these target durations requires the development of a super-pressure balloon design. The use of textile structures have already been established in these missions in the form of high strength tendons essential for the super pressure pumpkin design. Unfortunately, high strength fibers lose significant strength upon exposure to Ultra Violet (UV) radiation. Such UV degradation poses a serious challenge for the development of the ULDB. To improve the mission performance of the ULDB, new methods for protecting the tendons from the environmental effects need to be developed. NASA and NC State University College of Textiles are undertaking a research program to address these issues. Four tracks have been identified to prepare finishes that are believed to enhance the resistance of high strength fibers to UV. These tracks are: (a) self-polymerizing, (b) diffusion application, (c) polymer-filled with 30-40% UV absorber, and (d) combination of dyeing plus surface application. Four high performance fibers have been selected for this research investigation. These are Vectran, Spectra, Kevlar and, PBO (Zylon). This work will address the current progress of evaluating the performance of the UV finishes. This will be accomplished by comparing the tensile properties (strenthg, breaking elongation, modulus, etc) of untreated, unexposed to UV fibers

  8. Experiencia preliminar en el tratamiento combinado de metástasis vertebrales mediante radiofrecuencia y cifoplastia en sesión única Preliminary experience in the treatment of vertebral metastases by radiofrequency and Kyphoplasty combined in one single session

    Directory of Open Access Journals (Sweden)

    G. Buitrago

    2013-02-01

    de radiofrecuencia asociada a cifoplastia en la enfermedad metastásica vertebral puede contribuir al manejo del dolor refractario al tratamiento médico y al control local de la enfermedad.Objectives: Describe our preliminary experience in the treatment of vertebral metastases by radiofrequency and Kyphoplasty combined in one single session. Material and methods: Four patients with histologically confirmed single spinal metastasis (breast, prostate, lung and myeloma in L1, L5, D12, D12, respectively were treated. The indication in all cases was pain with a poor response to medical treatment. All patients had pain in the range 6-7 visual analogue scale (VAS. In two cases there was a lytic lesion of the spinal posterior wall. After obtaining informed consent, and under sedation and local anesthetic the procedure took place. The transpedicular approach took place with a 11 G bone puncture system. Two radiofrequency needles were coaxially inserted to carry out an ablation cycle through each pedicle. During the ablation cycle the tip of the ablation neddle stood between the anterior and middle third of the vertebral body, while the second needle was used as thermal sensor with its end to the height of the vertebral posterior wall. The duration of each cycle of ablation was 8 minutes reaching intratumoral temperatures of 70-80 ºC. Transpedicular Kyphoplasty was performed subsequently. Results: No complications were reported during or after the procedure and patients were discharged in the first 24 hours. There was an immediate improvement in pain after the procedure (with a VAS 1-2 intensity pain in all patients. During follow up, analgesic medication was withdrawn in three patients, and there was no evidence of disease progression or recurrence of pain (pain intensity 1 (VAS in a follow-up in the range of 8-14 months. Clinical and radiological follow-up after discharge could not be performed on a patient. Conclusion: The use of radio-frequency associated with

  9. 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

  10. Depression of the Thoracolumbar Posterior Vertebral Body on the Estimation of Cement Leakage in Vertebroplasty and Kyphoplasty Operations

    Science.gov (United States)

    Chen, Hao; Jia, Pu; Bao, Li; Feng, Fei; Yang, He; Li, Jin-Jun; Tang, Hai

    2015-01-01

    Background: The cross-section of thoracolumbar vertebral body is kidney-shaped with depressed posterior boundary. The anterior wall of the vertebral canal is separated from the posterior wall of the vertebral body on the lateral X-ray image. This study was designed to determine the sagittal distance between the anterior border of the vertebral canal and the posterior border of the vertebral body (DBCV) and to analyze the potential role of DBCV in the estimation of cement leakage during percutaneous vertebroplasty (PVP) or percutaneous kyphoplasty (PKP). Methods: We retrospectively recruited 233 patients who had osteoporotic vertebral compression fractures and were treated with PVP or PKP. Computed tomography images of T11–L2 normal vertebrae were measured to obtain DBCV. The distance from cement to the posterior wall of the vertebral body (DCPW) of thoracolumbar vertebrae was measured from C-arm images. The selected vertebrae were divided into two groups according to DCPW, with the fracture levels, fracture grades and leakage rates of the two groups compared. A relative operating characteristic (ROC) curve was applied to determine whether the DCPW difference can be used to estimate the degree of cement leakage. The data were processed by statistical software SPSS version 21.0 using independent sample t-test and Chi-square tests. Results: The maximum DBCV was 6.40 mm and the average DBCV was 3.74 ± 0.95 mm. DBCV appeared to be longer in males than in females, but the difference was not statistically significant. The average DCPW of type-B leakage vertebrae (2.59 ± 1.20 mm) was shorter than that of other vertebrae (7.83 ± 2.38 mm, P 6.40 mm for type-C and type-S, but much higher for type-B. ROC curve revealed that DCPW only has a predictive value for type-B leakage (area under the curve: 0.98, 95% confidence interval: 0.95–0.99, P < 0.001), and when the cut-off value was 4.05 mm, the diagnostic sensitivity and the specificity were 94.87% and 93

  11. 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 pe

  12. Double-balloon enteroscopy reliably directs surgical intervention for patients with small intestinal bleeding

    Institute of Scientific and Technical Information of China (English)

    Mou-Bin Lin; Lu Yin; Jian-Wen Li; Wei-Guo Hu; Qian-Jian Qian

    2008-01-01

    AIM: To evaluate preoperative double-balloon enteroscopy for determining bleeding lesions of small intestine, thus directing selective surgical intervention.METHODS: We retrospectively reviewed 56 patients who underwent double-balloon enteroscopy to localize intestinal bleeding prior to surgical intervention, and compared enteroscopic findings with those of intraoperation to determine the accuracy of enteroscopy in identifying and localizing the sites of small intestinal bleeding.RESULTS: Double-balloon enteroscopy was performed in all 56 patients in a 30-mo period. A possible site of blood loss was identified in 54 (96%) patients. Enteroscopy provided accurate localization of the bleeding in 53 (95%) of 56 patients, but failed to disclose the cause of bleeding in 4 (7%). There was one case with negative intraoperative finding (2%). Resection of the affected bowel was carried out except one patient who experienced rebleeding after operation. Gastrointestinal stromal tumor (GIST) was most frequently diagnosed (55%).CONCLUSION: Double-balloon enteroscopy is a safe, reliable modality for determining bleeding lesion of small intestine. This technique can be used to direct selective surgical intervention.

  13. Design and Implementation of an experiment-specific Payload Orientation Platform for balloon-borne Experiment .

    Science.gov (United States)

    Devarajan, Anand; Rodi, Ashish; Ojha, Devendra

    2012-07-01

    To investigate the mesospheric dynamics and its coupling to the upper atmospheric regions above, a Balloon-borne optical Investigation of Regional-atmospheric Dynamics (BIRD) experiment was jointly conducted by Physical Research Laboratory Ahmedabad and Boston University, on 08 March 2010 from TIFR Balloon Facility, Hyderabad. Along with the BIRD payload, a nano payload of University of York, Canada was also flown for aerosol studies during sunset. The balloon carrying a 335kg BIRD payload was launched at 1052 hrs, reached a float altitude of 34.8km amsl at 1245 hrs and was allowed to float till 1825 hrs before it was parachuted down. To achieve the experimental objectives, it was essential that the payload Gandola, comprising of two optical spectrographs, is programmed to rotate azimuthally in 3 steps of 30 degrees each from East-West (E-W) to North-South (N-S) direction, stop at each step for 5 minutes for data acquisition, return to the original E-W position and keep repeating the sequence continuously with a provision to start or stop the orientation from Ground station through telecommand. To meet these unique requirements, we designed developed and implemented a Payload Orientation Platform (POP), using flux-gate magnetometer for direction-finding, which worked satisfactorily in the BIRD flight. This paper presents an overview of the POP implemented, focuses on the design considerations of the associated electronics and finally presents the results of the performance during the entire balloon flight.

  14. Balloon laryngoplasty for acquired subglottic stenosis in children: predictive factors for success

    Directory of Open Access Journals (Sweden)

    Rebecca Maunsell

    2014-10-01

    Full Text Available INTRODUCTION: The treatment of subglottic stenosis in children remains a challenge for the otorhinolaryngologist, and may involve both endoscopic and open surgery. OBJECTIVE: To report the experience of two tertiary facilities in the treatment of acquired subglottic stenosis in children with balloon laryngoplasty, and to identify predictive factors for success of the technique and its complications. METHODS: Descriptive, prospective study of children diagnosed with acquired subglottic stenosis and submitted to balloon laryngoplasty as primary treatment. RESULTS: Balloon laryngoplasty was performed in 37 children with an average age of 22.5 months; 24 presented chronic subglottic stenosis and 13 acute subglottic stenosis. Success rates were 100% for acute subglottic stenosis and 32% for chronic subglottic stenosis. Success was significantly associated with acute stenosis, initial grade of stenosis, children of a smaller age, and the absence of tracheostomy. Transitory dysphagia was the only complication observed in three children. CONCLUSION: Balloon laryngoplasty may be considered the first line of treatment for acquired subglottic stenosis. In acute cases, the success rate is 100%, and although the results are less promising in chronic cases, complications are not significant and the possibility of open surgery remains without prejudice.

  15. 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.

  16. 椎体后凸成形术后疼痛的原因分析%Causes of the Pain after Kyphoplasty for Vertebral Compressive Fractures

    Institute of Scientific and Technical Information of China (English)

    陈晓明; 马华松; 王蒙; 杨滨; 袁伟

    2012-01-01

    目的 探讨椎体后凸成形术治疗椎体压缩骨折术后疼痛的原因. 方法 8例骨质疏松性椎体压缩骨折行椎体后凸成形术后仍然疼痛原因:2例出现骨水泥渗漏;3例术中出现椎弓根骨折;2例随访中出现邻近节段骨折;1例术后检查发现转移性病理骨折.骨水泥渗漏和椎弓根骨折患者给予镇痛和卧床休息及继续抗骨质疏松治疗,2例邻近节段骨折再次行椎体后凸成形术,1例转移性病理骨折进行放化疗. 结果 8例随访3 ~12个月,平均7个月,7例骨质疏松性骨折治疗前VAS(3.5±1.5)分,治疗后VAS(1.2±0.5)分;1例病理性骨折治疗前VAS评分为4分,随访时VAS为1.3分. 结论 椎体后凸成形术治疗骨质疏松性椎体压缩骨折术后疼痛原因包括骨水泥渗漏、椎弓根骨折、邻近节段骨折等,应对术后疼痛进行个体化处理.%Objective To evaluate the causes of post-kyphoplasty pain in patients with vertebral compressive fractures. Methods Totally 8 patients with osteoporotic compressive fractures, who had pain after kyphoplasty, were enrolled in this study. Among the patients, two had bone cement leakage, three showed pedicle fractures, two were diagnosed with adjacent segment fractures, and one were confirmed with metastatic pathologic fracture by postoperative examinations. The patients who had cement leakage or pedicle fractures received analgesia, bed rest and anti-osteoporosis treatments, while those who developed adjacent segment fractures or metastatic pathologic fracture received chemotherapy. Results The eight patients were followed up for 3 to 12 months with a mean of 7 months, during which the VAS of the 7 cases of osteoporotic compressive fractures decreased from 3.5 ±1.5 preoperatively to 1.2 ± 0. 5, and that in the patient with pathological compressive fracture decreased from 4 to 1.3. Conclusions Pain after kyphoplasty for osteoporotic compressive fractures can be caused by bone cement leakage

  17. 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).

  18. Audit of radiation dose during balloon mitral valvuloplasty procedure

    Energy Technology Data Exchange (ETDEWEB)

    Livingstone, Roshan S [Department of Radiology, Christian Medical College, Vellore-632004, TN (India); Chandy, Sunil [Department of Cardiology, Christian Medical College, Vellore-632004, TN (India); Peace, B S Timothy [Department of Radiology, Christian Medical College, Vellore-632004, TN (India); George, Paul [Department of Cardiology, Christian Medical College, Vellore-632004, TN (India); John, Bobby [Department of Cardiology, Christian Medical College, Vellore-632004, TN (India); Pati, Purendra [Department of Cardiology, Christian Medical College, Vellore-632004, TN (India)

    2006-12-15

    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{sup 2} and from the other was 21.19 Gy cm{sup 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{sup 2}.

  19. 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

    Directory of Open Access Journals (Sweden)

    J.-B. Renard

    2015-09-01

    Full Text Available In the companion paper (Renard et al., 2015, 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 some topology identification of particles (droplets, carbonaceous, salts, and mineral dust in addition to size segregated counting in a large diameter range from 0.2 up to possibly more than 100 μm depending on sampling conditions. 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 (UAV and at ground level. We illustrate here the first LOAC airborne results obtained from an unmanned aerial vehicle (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.

  20. 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.

  1. Stratospheric composition from balloon based measurements

    Energy Technology Data Exchange (ETDEWEB)

    Mencaraglia, F.; Carli, B. [Ist. per le Ricerche sulle Onde Elettromagnetiche, Firenze (Italy); Bonetti, A.; Ciarpallini, P. [Univ. di Firenze (Italy); Carlotti, M.; Lepri, G. [Univ. di Bologna (Italy); Alboni, F.; Cortesi, U.; Ridolfi, M. [Fondazione per la Metereologia Applicata, Firenze (Italy)

    1995-12-31

    Measurements of the composition of the earth`s atmosphere is of fundamental importance for the study of atmospheric chemistry and for developing models that can predict the evolution of the atmosphere itself. Here, the chemical composition of the lower stratosphere has been measured using a polarizing interferometer operating in the far infrared and submillimetric spectral region. The instrument was flown three times (in 1992, 1993 and 1994) from the NSBF balloon base (Fort Sumner, New Mexico) in coincidence with overpasses of the UARS satellite, for a total of about 50 hours of measurements. In this paper the authors report some of the results obtained from the data analysis made up to now.

  2. 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 selectio...... within the next 12 months. Conclusions. CE can be applied as a screening procedure for DBE and allows for an approximately two-thirds reduction in the need for DBE as well as enabling a choice to be made between the oral and anal route Udgivelsesdato: 2008...

  3. 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.

  4. Ballooning Spiders: The Case for Electrostatic Flight

    CERN Document Server

    Gorham, Peter W

    2013-01-01

    We consider general aspects of the physics underlying the flight of Gossamer spiders, also known as ballooning spiders. We show that existing observations and the physics of spider silk in the presence of the Earth's static atmospheric electric field indicate a potentially important role for electrostatic forces in the flight of Gossamer spiders. A compelling example is analyzed in detail, motivated by the observed "unaccountable rapidity" in the launching of such spiders from H.M.S. Beagle, recorded by Charles Darwin during his famous voyage.

  5. Thrombus aspiration catheter is a Dottering balloon.

    Science.gov (United States)

    Sheshagiri Rao, D; Barik, Ramachandra; Prasad, Akula Siva

    2016-01-01

    Coronary angiogram in a young man with history of STEMI with delayed presentation revealed subtotal occlusion of left anterior descending artery (LAD) with large thrombotic filling defect distal to the critical lesion. PCI was preferred without delay because of ongoing chest pain. Several runs of thrombus aspiration failed to detect any visible thrombus. However, the immediate angiogram after thrombus aspiration showed complete distal embolization of the thrombus which could have been achieved by Dottering or balloon dilatation. In contrary to the general perception, does thrombus aspiration push more thrombus than it can aspirate?

  6. A PROSPECTIVE COMPARATIVE STUDY BETWEEN CLOSED MITRAL VALVOTOMY AND BALLOON VALVOPLASTY AS TREATMENT FOR RHEUMATIC NON CALCIFIC MITRAL STENOSIS

    Directory of Open Access Journals (Sweden)

    Ravikrishnan

    2015-08-01

    Full Text Available BACKGROUND: Treatment of rheumatic mitral stenosis ranges from conservative medical management to closed mitral valvotomy and the more recent balloon mitral valvoplasty. This is a prospective study to compare the results of closed mitral valvotomy with percutaneous b alloon valvoplasty in 100 cases (50 patients in each group of rheumatic non - calcific mitral stenosis. MATERIALS AND METHODS: From November 2011 to March 2012, 50 patient underwent closed mitral valvotomy and another 50 had percutaneous balloon mitral valv oplasty. Balloon mitral valvoplasty was performed by Inoue technique and closed mitral valvotomy was carried out through standard anterolateral thoracotomy with transventricular gradual Tubbs dilatation. NYHA functional status, left atrial size, transmitra l end diastolic gradient, mean diastolic gradient and mitral valve area were recorded. The results at the 4 day post procedure and the results at the 6 months follow up were compared. RESULTS: Residual atrial septal defect (ASD was present in 6 patients a t 6 month follow up after balloon mitral valvoplasty. Severe mitral regurgitation occurred in 3 cases of closed mitral valvotomy group as compared to 7 cases of balloon mitral valvoplasty group. Urgent mitral valve replacement was needed in 2 patient of ba lloon mitral valvoplasty group. There was single mortality in each group. CONCLUSION: No statistical significant difference between the result of closed mitral valvotomy and balloon mitral valvoplasty but better outcome obtained by closed mitral valvotomy. Hemodynamic and functional improvement was sustained through 6 month of follow up in both groups. Procedural cost of closed mitral valvotomy was significantly lower than the procedural cost of balloon mitral valvoplasty.

  7. 21 CFR 870.1350 - Catheter balloon repair kit.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Catheter balloon repair kit. 870.1350 Section 870... repair kit. (a) Identification. A catheter balloon repair kit is a device used to repair or replace the... effect the repair or replacement. (b) Classification. Class III (premarket approval). (c) Date PMA...

  8. Reversible transient apical ballooning syndrome with coronary lesions

    Institute of Scientific and Technical Information of China (English)

    Yunshan Cao; Min Zhang; Xiang Li; Ping Xie; Lynn Cronin

    2009-01-01

    Transient apical ballooning syndrome(Tako-Tsubo syndrome or ampulla cardiomyopathy) occurs predominantly in women over 60 years of age with a history of recent physical or psychological stress. We present a case of a male patient with reversible transient apical ballooning syndrome with significant coronary lesions and other ECG changes that did not explain the clinical symptoms.

  9. Endoscopic treatment of vesicoureteral reflux with a self-detachable balloon system.

    Science.gov (United States)

    Atala, A; Peters, C A; Retik, A B; Mandell, J

    1992-08-01

    There is controversy about the use of polytetrafluoroethylene (Teflon) paste in children for the endoscopic treatment of vesicoureteral reflux due to evidence of particle migration. However, there are definite advantages in treating patients endoscopically. It is evident that the ideal substance should be able to be delivered endoscopically, conserve its volume, and be nonmigratory and nonantigenic. Towards this goal we developed a catheter with an inflatable, detachable and self-sealing silicone balloon that would fit through a 19 gauge cystoscopic needle. Hydroxy-ethyl-methyl acrylate, a hydrophilic polymer that solidifies within 60 minutes after the addition of ferrous sulfate, was chosen as the filling material for the balloon. Conceptually, the sealed balloon would prevent the migration of hydroxy-ethyl-methyl acrylate and the solidified polymer would prevent volume loss. To test this system reflux was created in 6 Hanford mini-pigs by unroofing the ureters bilaterally. In 2 pigs a previously described method of open surgery was used and in the other 4 reflux was created endoscopically using the resectoscope and laparoscopic scissors. The presence of bilateral reflux was confirmed 4 weeks later with a cystogram and the balloon was implanted unilaterally through a cystoscope. The opposite ureter served as an internal control in all animals. A repeat cystogram was performed 2 to 4 weeks after implantation, demonstrating resolution of reflux in the treated side and persistence of reflux in the opposite untreated ureter. Serial cystograms, ultrasound and excretory urography showed no reflux on the implanted side nor any evidence of obstruction. Tissue sections from various organs showed no evidence of particle migration, granuloma formation or inflammatory reaction. Short-term results show that the balloon implants are able to correct reflux without evidence of obstruction.

  10. The Application of Dual-wire Balloon in The Treatment of Coronary Bifurcation Lesions

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Objectives To assess the efficiency and safety of dual-wire balloon angioplasty side branch combined stenting the main branch in the treatment of coronary bifurcation lesions. Methods This study included thirty-six patients with 41 coronary bifurcation lesions. Selective dual-wire balloon angioplasty was performed in side branch and/or in main branch, and implantation of stents was performed in main branch only. Clinical outcome and major adverse cardiac events were observed inhospital and follow-up. Results Success rate of side branch dilatation before main branch stenting was 100%; main branch direct stenting performed in 4 cases; success main branch dilatation performed in the other 37 cases; kissing technique was performed successfully in 5 cases, which side branch was jailed after main branch stenting with TIMI grade 0-2 flow. No Q-wave myocardial infarction, acute revascularization and death occurred during in-hospital.Clinical follow-up was available in all patients. No Q-wave myocardial infarction, revascularization and death occurred, angina pectoris recurred in three patients,released by strengthen drug treatment. Conclusions Dual-wire balloon angioplasty side branch combined stenting the main branch is simple, safe and effective for the treatment of coronary bifurcation lesions.

  11. A New Paradigm in Space Based Experiments Using Rubber Balloons

    CERN Document Server

    Chakrabarti, Sandip K; Palit, Sourav; Chakraborty, Subhankar; Mondal, Sushanta; Bhattacharyya, Arnab; Middya, Susanta; Chakrabarti, Sonali

    2013-01-01

    Indian Centre for Space Physics is engaged in long duration balloon borne experiments with typical payloads less than ~ 3kg. Low cost rubber balloons are used. In a double balloon system, the booster balloon lifts the orbiter balloon to its cruising altitude where data is taken for a long time. Here we present results of muon detections and recent solar activities, including the light curves and flare spectra in the 20-100keV range. We not only show that we have successfully obtained several flares and there spectra at different altitudes, we also found that the high energy X-ray flux of strong flares at altitudes of 10-13 km (the flight altitude of commercial planes) could be more than the contribution due to cosmic rays.

  12. Global kinetic ballooning mode simulations in BOUT++

    Science.gov (United States)

    Ma, C. H.; Xu, X. Q.

    2017-01-01

    We report on simulation results of a 3+1 gyro-Landau-fluid (GLF) model in BOUT++ framework, which contributes to increasing the physics understanding of the edge turbulence. We find that there is no second stability region of kinetic ballooning modes (KBM) in the concentric circular geometry. The first unstable β of KBM decreases below the ideal ballooning mode threshold with increasing {ηi} . In order to study the KBM in the real tokamak equilibrium, we find that the approximation of shifted circular geometry (β \\ll {{\\varepsilon}2} ) is not valid for a high β global equilibrium near the second stability region of KBM. Thus we generate a series of real equilibria from a global equilibrium solver CORSICA, including both Shafranov shift and elongation effects, but not including bootstrap current. In these real equilibria, the second stability region of KBM are observed in our global linear simulations. The most unstable mode for different β are the same while the mode number spectrum near the second stability region is wider than the case near the first stability region. The nonlinear simulations show that the energy loss of an ELM keeps increasing with β, because the linear drive of the turbulence remains strong for the case near the second stability region during profile evolution.

  13. A constitutive equation for stratospheric balloon materials

    Science.gov (United States)

    Rand, J.; Sterling, J.

    The selection of a suitable material for use as a reliable stratospheric balloon gas barrier and structural component is based on a variety of desired properties. In order to achieve the required combination of weight per unit area, helium permeation, strength, flexibility and toughness at low temperatures, low density polyethylene has been used for the last half century. During the last decade, linear low density polyethylene (LLDPE) has been found to have even better properties for this application. Thin films extruded from this type resin have been found to have time dependent properties which should be understood in order to make an intelligent analysis of the balloon. This paper describes the current effort to characterize a 38 micron coextrusion of LLDPE as a nonlinearly viscoelastic material. The resulting constitutive equation may be used to accurately describe the time dependent creep and/or relaxation of this film when subjected to a biaxial state of stress. Recent laboratory data have been used to modify an existing model of LLDPE to account for differences caused by the coextrusion process. The new model will facilitate structure design optimization and reliability assessment, and may further be utilized as a predictive tool to benefit in-flight operations. Unfortunately, current structural analysis techniques based on linear elastic properties will predict stresses in excess of those which actually exist. An example will be presented which demonstrates the magnitude of this error when nonlinear behavior is ignored.

  14. The laser driven short-term heating balloon catheter: Relation between the chronic neointimal hyperplasia formation and thermal damage to arterial smooth muscle cells.

    Science.gov (United States)

    Shimazaki, Natsumi; Hayashi, Tomoaki; Kunio, Mie; Igami, Yuka; Arai, Tsunenori; Sakurada, Masami

    2010-01-01

    We proposed a novel laser-driven short-term heating angioplasty to realize restenosis-suppressive angioplasty for peripheral artery disease. In this study, we investigated the chronic intimal hyperplasia formation after the short-term heating dilatation in vivo, as well as the thermal damage calculation on arterial smooth muscle cells (SMCs). The prototype short-term heating balloon catheter with 5.0, 5.5, 6.0 mm φ in balloon diameter and 25 mm in balloon length were employed. The short-term heating dilatation was performed in porcine iliac arteries with dilatation conditions of 75°C (N=4) and 65°C (N=5) as peak balloon temperature, 18 ± 4s as heating duration, 3.5 atm as balloon dilatation pressure. Four weeks after the balloon dilatation, the balloon-dilated artery segments were extracted and were stained with HE and picrosirius red for histological observation. In the case of 75°C as the peak balloon temperature, neointimal hyperplasia formation was significantly reduced. In this case, the SMCs density in the artery media measured from the HE-stained specimen was 20% lower than that in the reference artery. According to the thermal damage calculation, it was estimated that the SMCs lethality in artery media after the short-term heating angioplasty was 20% in the case of 75°C as the peak balloon temperature. We demonstrated that the short-term heating dilatation reduced the number of SMCs in artery media. We think this SMCs reduction might contribute to the suppression of chronic neointimal hyperplasia.

  15. Analysis of actinic flux profiles measured from an ozonesonde balloon

    Science.gov (United States)

    Wang, P.; Allaart, M.; Knap, W. H.; Stammes, P.

    2015-04-01

    A green light sensor has been developed at KNMI to measure actinic flux profiles using an ozonesonde balloon. In total, 63 launches with ascending and descending profiles were performed between 2006 and 2010. The measured uncalibrated actinic flux profiles are analysed using the Doubling-Adding KNMI (DAK) radiative transfer model. Values of the cloud optical thickness (COT) along the flight track were taken from the Spinning Enhanced Visible and Infrared Imager (SEVIRI) Cloud Physical Properties (CPP) product. The impact of clouds on the actinic flux profile is evaluated on the basis of the cloud modification factor (CMF) at the cloud top and cloud base, which is the ratio between the actinic fluxes for cloudy and clear-sky scenes. The impact of clouds on the actinic flux is clearly detected: the largest enhancement occurs at the cloud top due to multiple scattering. The actinic flux decreases almost linearly from cloud top to cloud base. Above the cloud top the actinic flux also increases compared to clear-sky scenes. We find that clouds can increase the actinic flux to 2.3 times the clear-sky value at cloud top and decrease it to about 0.05 at cloud base. The relationship between CMF and COT agrees well with DAK simulations, except for a few outliers. Good agreement is found between the DAK-simulated actinic flux profiles and the observations for single-layer clouds in fully overcast scenes. The instrument is suitable for operational balloon measurements because of its simplicity and low cost. It is worth further developing the instrument and launching it together with atmospheric chemistry composition sensors.

  16. Background measurements from balloon-born imaging CZT detectors

    Science.gov (United States)

    Jenkins, Jonathan A.; Narita, Tomohiko; Grindlay, Jonathan E.; Bloser, Peter F.; Stahle, Carl M.; Parker, Bradford H.; Barthelmy, Scott D.

    2003-03-01

    We report detector characteristics and background measurements from two prototype imaging CdZnTe (CZT) detectors flown on a scientific balloon payload in May 2001. The detectors are both platinum-contact 10 mm × 10 mm × 5 mm CZT crystals, each with a 4 × 4 array of pixels tiling the anode. One is made from IMARAD horizontal Bridgman CZT, the other from eV Products high-pressure Bridgman CZT. Both detectors were mounted side-by-side in a flip-chip configuration and read out by a 32-channel IDE VA/TA ASIC preamp/shaper. We enclosed the detectors in the same 40o field-of-view collimator used in our previously-reported September 2000 flight. I-V curves for the detectors are diode-like, and we find that the platinum contacts adhere significantly better to the CZT surfaces than gold to previosu detectors. The detectors and instrumentation performed well in a 20-hour balloon flight on 23/24 May 2001. Although we discovered a significant instrumental background component in flight, it was possible to measure and subtract this component from the spectra. The resulting IMARAD detector background spectrum reaches ~5×10-3 counts cm-2s-1keV-1 at 100 keV and has a power-law index of ~2 at hgih energies. The eV Products detector has a similar spectrum, although there is more uncertainty in the enregy scale because of calibration complications.

  17. CNES super pressure balloons upgrade for Strateole-2 campaign

    Science.gov (United States)

    Venel, Stephanie; Cocquerez, Philippe; Hertzog, Albert

    2016-07-01

    The French Space Agency, CNES, has developed, since about twelve years ago, super pressure balloons (SPB) that float on constant density (isopycnic) surfaces in the lowermost stratosphere, carrying 40 to 50 kg payloads, during typically three months. These SPB have been successfully deployed in flotilla of about 20 balloons for different scientific campaigns all over the world in different configuration sizes from 8,5 to 12 m diameter, mainly to document the chemistry and dynamics of the atmosphere, to study gravity waves, and to provide in-situ atmospheric profiles thanks to the NCAR driftsonde payload. The SPB housekeeping gondola used from 2005 to 2011 now needs to be upgraded in order to increase the flights' safety and to improve its performance with up to date equipment's. The control center will also be redesigned. These modifications take into account the experience acquired during the last SPB campaigns, mainly during CONCORDIASI, with 19 flights over Antarctica from September 2010 to January 2011. After a successful preliminary design review, the project is now conducting the detailed conception phase. This new system is developed for STRATEOLE-2, a project dedicated to the coupling processes between the troposphere and the stratosphere in the deep tropics, using several types of instruments, both for in situ and remote measurements in the atmosphere. STRATEOLE -2 includes two measurement campaigns, three years spaced to study the quasi biennial oscillation. Since the scientific payloads are fully self-standing, some technical solutions will be common with the CNES housekeeping gondola, such as the renewable power system. This paper will describe the STRATEOLE-2 project and the developments in progress for the SPB system upgrade.

  18. 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

    1991-01-01

    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

  19. Characterization of a pneumatic balloon actuator for use in refreshable Braille displays.

    Science.gov (United States)

    Fan, Richard E; Feinman, Adam M; Wottawa, Christopher; King, Chih-Hung; Franco, Miguel L; Dutson, Erik P; Grundfest, Warren S; Culjat, Martin O

    2009-01-01

    Many existing refreshable Braille display technologies are costly or lack robust performance. A process has been developed to fabricate consistent and reliable pneumatic balloon actuators at low material cost, using a novel manufacturing process. This technique has been adapted for use in refreshable Braille displays that feature low power consumption, ease of manufacture and small form factor. A prototype refreshable cell, conforming to American Braille standards, was developed and tested. The cell was fabricated from molded PDMS to form balloon actuators with a spin-coated silicone film, and fast pneumatic driving elements and an electronic control system were developed to drive the Braille dots. Perceptual testing was performed to determine the feasibility of the approach using a single blind human subject. The subject was able to detect randomized Braille letters rapidly generated by the actuator with 100% character detection accuracy.

  20. The role of balloon aortic valvuloplasty in the era of transcatheter aortic valve implantation

    Science.gov (United States)

    Wilczek, Krzysztof; Pres, Damian; Krajewski, Adam; Poloński, Lech; Zembala, Marian; Gąsior, Mariusz

    2015-01-01

    Balloon aortic valvuloplasty is recommended in patients not suitable for transcatheter aortic valve implantation/aortic valve replacement (TAVI/AVR) or when such interventions are temporarily contraindicated. The number of performed balloon aortic valvuloplasty (BAV) procedures has been increasing in recent years. Valvuloplasty enables the selection of individuals with severe left ventricular dysfunction or with symptoms of uncertain origin resulting from concomitant disorders (including chronic obstructive pulmonary disease [COPD]) who can benefit from destination therapy (AVR/TAVI). Thanks to improved equipment, the number of adverse effects is now lower than it was in the first years after the advent of BAV. Valvuloplasty can be safely performed even in unstable patients, but long-term results remain poor. In view of the limited availability of TAVI in Poland, it is reasonable to qualify patients for BAV more often, as it is a relatively safe procedure improving the clinical condition of patients awaiting AVR/TAVI. PMID:26336471

  1. Novel short-duration heating balloon dilatation with uniform temperature distribution: the heating conditions to suppress neo-intimal hyperplasia.

    Science.gov (United States)

    Kunio, M; Shimazaki, N; Arai, T; Sakurada, M

    2011-01-01

    We investigate the relation between the influences on smooth muscle cells and the chronic performances of our novel short-duration heating balloon dilatation to reveal the heating conditions which can suppress the neo-intimal hyperplasia after our heating dilatations. The temperature of prototype balloon catheter surface was measured during short-duration heating balloon dilatation ex vivo. There existed 2 °C temperature variations in the long direction of prototype balloon catheter at a maximum. The neo-intimal hyperplasia occupancy rate after our short-duration heating dilatations were measured in vivo porcine study. The neo-intimal hyperplasia was suppressed most at 75 °C in balloon peak temperature in vivo. The estimated dead rate of smooth muscle cells at this condition was about 13% by the Arrhenius equation. We think that the suppression of neo-intimal hyperplasia was obtained after our short-duration heating dilatation due to the proper decrease of smooth muscle cells by heating and no thermal damages to the adventitia and surrounding tissues.

  2. Effect of intra-aortic balloon pump on coronary blood flow during different balloon cycles support: A computer study.

    Science.gov (United States)

    Aye, Thin Pa Pa; Htet, Zwe Lin; Singhavilai, Thamvarit; Naiyanetr, Phornphop

    2015-01-01

    Intra-aortic balloon pump (IABP) has been used in clinical treatment as a mechanical circulatory support device for patients with heart failure. A computer model is used to study the effect on coronary blood flow (CBF) with different balloon cycles under both normal and pathological conditions. The model of cardiovascular and IABP is developed by using MATLAB SIMULINK. The effect on coronary blood flow has been studied under both normal and pathological conditions using different balloon cycles (balloon off; 1:4; 1:2; 1:1). A pathological heart is implemented by reducing the left ventricular contractility. The result of this study shows that the rate of balloon cycles is related to the level of coronary blood flow.

  3. Completely obstructed colorectal anastomosis: A new non-electrosurgical endoscopic approach before balloon dilatation

    Institute of Scientific and Technical Information of China (English)

    Gabriele; Curcio; Marco; Spada; Fabrizio; di; Francesco; Ilaria; Tarantino; Luca; Barresi; Gaetano; Burgio; Mario; Traina

    2010-01-01

    Benign stricture is a relatively common complication of colorectal anastomosis after low anterior resection. On occasion, the anastomosis may close completely. A variety of endoscopic techniques have been described, but there is a lack of data from controlled prospective trials as to the optimal approach. Through-the-scope balloon dilatation is well known and easy to perform. Some case reports describe different endoscopic approaches, including endoscopic electrocision with a papillotomy knife or hook knife...

  4. Tracheal rupture after intubation and placement of an endotracheal balloon catheter (A-view®) in cardiac surgery.

    Science.gov (United States)

    Timman, Simone T; Mourisse, Jo M; van der Heide, Stefan M; Verhagen, Ad F

    2016-09-01

    The endotracheal balloon catheter (A-view®) is a device developed to locate atherosclerotic plaques of the ascending aorta (AA) in cardiac surgery to prevent stroke. The saline-filled balloon is located in the trachea and combines the advantages of transoesophageal echocardiography (e.g. used before performing the sternotomy) and intraoperative epiaortic ultrasound scanning (e.g. complete view of the AA). We report the first severe complication after the use of A-view®. This is a case of a 66-year old woman who underwent elective myocardial revascularization complicated by an intraoperative iatrogenic tracheal rupture of 6 cm, after uncomplicated intubation and the use of an endotracheal balloon catheter (A-view®), which required direct surgical repair with a posterolateral thoracotomy after the myocardial revascularization was completed, weaning from bypass and closure of the median sternotomy.

  5. Longitudinal stent elongation during retraction of entrapped jailed guidewire in a side branch with balloon catheter support: a case report

    Energy Technology Data Exchange (ETDEWEB)

    Taniguchi, Norimasa; Mizuguchi, Yukio; Takahashi, Akihiko, E-mail: a-takahashi@wine.ocn.ne.jp

    2015-01-15

    A 72-year-old man underwent primary percutaneous coronary intervention for a subtotal occlusion in the mid-portion of the left anterior descending artery involving a large diagonal branch. After successful stenting with a 3.0/24 mm bare metal stent, during which, the diagonal branch was protected with a coronary guidewire, conventional retrieval of the jailed guide wire was impossible. Subsequently, several attempts at a strong retraction of the wire with the support of a balloon catheter enabled retrieval of the trapped wire. Optical coherence tomography performed after post-dilatation, revealed that the stent was elongated to the left main coronary artery, and the structure of the strut had become coarse in the proximal portion. The stent was believed to have become entangled with the balloon catheter when the guidewire was being pulled. This case suggests that retrieving the jailed guidewire with a balloon catheter carries a potential risk of entrapment in the deformed stent.

  6. The protoMIRAX Hard X-ray Imaging Balloon Experiment

    CERN Document Server

    Braga, João; Avila, Manuel A C; Penacchioni, Ana V; Sacahui, J Rodrigo; Santiago, Valdivino A de; Mattiello-Francisco, Fátima; Strauss, Cesar; Fialho, Márcio A A

    2015-01-01

    The protoMIRAX hard X-ray imaging telescope is a balloon-borne experiment developed as a pathfinder for the MIRAX satellite mission. The experiment consists essentially in a coded-aperture hard X-ray (30-200 keV) imager with a square array (13$\\times$13) of 2mm-thick planar CZT detectors with a total area of 169 cm$^2$. The total, fully-coded field-of-view is $21^{\\circ}\\times 21^{\\circ}$ and the angular resolution is 1$^{\\circ}$43'. In this paper we describe the protoMIRAX instrument and all the subsystems of its balloon gondola, and we show simulated results of the instrument performance. The main objective of protoMIRAX is to carry out imaging spectroscopy of selected bright sources to demonstrate the performance of a prototype of the MIRAX hard X-ray imager. Detailed background and imaging simulations have been performed for protoMIRAX balloon flights. The 3$\\sigma$ sensitivity for the 30-200 keV range is ~1.9 $\\times$ 10$^{-5}$ photons cm$^{-2}$ s$^{-1}$ for an integration time of 8 hs at an atmospheric ...

  7. Design and Calibrations of the Protomirax Balloon Telescope and the Brazilian Scientific Balloon Program

    Science.gov (United States)

    Braga, Joao; D'Amico, Flavio; Avila, Manuel

    2012-07-01

    In this presentation we report on the recent scientific ballooning activities in Brazil, including important international collaborations, and present our plan for the next few years. We also present the recent progress achieved in the design of the detector system of the protoMIRAX balloon experiment and report on the scientific balloon activities in Brazil. protoMIRAX is a balloon-borne X-ray imaging telescope under development at INPE as a pathfinder for the MIRAX (Monitor e Imageador de Raios X) satellite mission. The experiment consists essentially in an X-ray (30-200 keV) coded-aperture imager which employs a square array of 196 10mm x 10mm x 2mm CdZnTe (CZT) planar detectors made by eV Products in the USA. A collimator defines a fully-coded field-of-view of 20o x 20o, with 4o x 4o of full sensitivity. The final angular resolution will depend on the mask pattern used. In this paper we describe the design and development of the detector plane, including the front-end electronics. Preamplifiers and shaping amplifiers, customized for these detectors, were designed and built at INPE. Laboratory spectral measurements show an energy resolution of 12.0% at 60 keV, of which 10.6% is due to intrinsic electronics noise measured with a pulser at similar pulse height levels. We present spectral results obtained in the laboratory as well as initial calibration results of the acquisition system designed to get positions and energies in the detector plane. We show simulations of the coded-aperture images with different mask designs and iterative reconstruction methods.

  8. A systematic review on unilateralversus bilateral kyphoplasty for osteoporotic vertebral compression fractures%单双侧球囊灌注骨水泥椎体成形修复骨质疏松性椎体压缩骨折的系统评价

    Institute of Scientific and Technical Information of China (English)

    杨森; 徐韬; 盛伟斌; 王国旗; 郭海龙

    2015-01-01

    BACKGROUND:Percutaneous kyphoplasty is an effective treatment for osteoporotic compression fractures, but randomized controled trials have smal sample size and methodological shortcomings. The priority of unilateral approach or bilateral approach of percutaneous kyphoplasty for the treatment of osteoporotic vertebral compression fractures is stil controversial. OBJECTIVE:To comprehensively evaluate and compare the unilateral and bilateral percutaneous kyphoplasty, and provide evidence for the selection of surgical approach. METHODS:A computer-based online search was done in the English and Chinese databases such as Cochrane Library, PubMed, OVID, Embase, China Biology Medicine disc, Wanfang, and VIP. Nine relevant Chinese orthopedic journals were manualy searched from the initial issue to the issue published in March 2014. Randomized controled trials comparing unilateral and bilateral kyphoplasty for osteoporotic vertebral compression fractures were colected. According to the inclusion and exclusion criteria, two evaluators performed the selection of test, data extraction and quality assessment. RevMan 5.2 software was used for meta-analysis. RESULTS AND CONCLUSION: Eight randomized controled trials involving 507 patients and 656 vertebral bodies were involved in the result analysis. The results showed that, there was no bone cement leakage between the two groups; preoperative visual analog scale score (WMD=-0.05,P=0.58) at short-term folow-up (≤ 3 months) (WMD=-0.02, P=0.25) and long-term folow-up (≥ 12 months) (WMD=0.08,P=0.64) also showed no significant differences between the two groups. Oswestry disability index at short-term folow-up (WMD=0.13,P= 0.73) and long-term folow-up (WMD=0.05,P= 0.98) in the two groups had no statistical significance. This meta-analysis showed significant difference in the bone cement volume and operating time, and the unilateral approach was better than bilateral approach. Radiographic findings showed that preoperative and

  9. Balloon observations of spatial coherence in the Global Circuit

    Science.gov (United States)

    Holzworth, R. H.; Polar Patrol Balloon Team

    The first campaign of the Polar Patrol Balloon (PPB) experiment (1st-PPB) was carried out at Syowa Station in Antarctica during 1990-1991 and 1992-1993. Based on the results of the 1st-PPB experiment, the next campaign (2nd-PPB) was carried out in the austral summer of 2002-2003. This paper will present the global circuit results from the 2nd-PPB experiment. In that experiment, three balloons were launched for the purpose of upper atmosphere physics observation (3 balloons). Payloads of these 3 flights were identical with each other, and were launched as close together in time as allowed by weather conditions to constitute a cluster of balloons during their flights. Such a "Balloon Cluster" is suitable to observe temporal evolution and spatial distribution of phenomena in the ionospheric regions and boundaries that the balloons traversed during their circumpolar trajectory. More than 20 days of simultaneous fair weather 3-axis electric field and stratospheric conductivity data were obtained at geomagnetic latitudes ranging from sub-auroral to the polar cap. Balloon separation varied from ˜ 60 to ˜ 500 km. This paper will present the global circuit observations with emphasis on the times of apparent spatial variation in the vertical fair weather field.

  10. Geodesic Acoustic Propagation and Ballooning Mode Formalism

    Science.gov (United States)

    Li, M. B.; Diamond, P. H.; Young, G. G.; Arakawa, M.

    2005-10-01

    Relevance of ballooning formalism (BMF) in nonlinear interaction of toroidal electromagnetic drift waves in the presence of zonal flows and Geodesic Acoustic Oscillation (GAO) is critically examined from a physical argument of radial propagation of wave packets. To achieve the quasi-translational invariance of poloidal harmonics which is necessary for the BMF, the geodesic curvature induced transfer [1] of fluctuation energy in radial direction should occur faster than the time scale of physical interest. Of course, this does not happen necessarily in drift-Alfven (DALF) turbulence simulations [2]. This observation casts considerable doubts on the applicability of various codes based on the BMF concept to nonlinear electromagnetic problems. [1] B. Scott, Phys. Letters A 320 (2003) 53. [2] B. Scott, New J. Phys 7 (2005) 92.

  11. The Norwegian Sounding Rocket and Balloon Program

    Science.gov (United States)

    Skatteboe, Rolf

    2001-08-01

    The status and recent developments of the Norwegian Sounding Rocket and Balloon Program are presented with focus on national activities and recent achievements. The main part of the Norwegian program is sounding rocket launches conducted by Andøya Rocket Range from the launch facilities on Andøya and at Svalbard. For the majority of the programs, the scientific goal is investigation of processes in the middle and upper atmosphere. The in situ measurements are supplemented by a large number of ground-based support instruments located at the ALOMAR Observatory. The ongoing and planned projects are described and the highlights of the latest completed projects are given. The scientific program for the period 2001-2003 will be reviewed. Several new programs have been started to improve the services available to the international science comunity. The Hotel Payload project and MiniDusty are important examples that will be introduced in the paper. Available space related infrastructure is summarized.

  12. Intragastric balloon: ethics, medical need and cosmetics.

    Science.gov (United States)

    Kotzampassi, Katerina; Shrewsbury, Anne D

    2008-01-01

    The development of the intragastic balloon as a safe, noninvasive, alternative method to weight reduction raises all the ethical questions routinely faced by practitioners of other forms of cosmetic surgery. In the case of the morbidly, severely or merely obese, the surgeon is faced with a medical decision in a situation defined by medical parameters. The case of the overweight or normal may, however, create an ethical dilemma in which the doctor is forced to make decisions of a nonmedical nature, for which his training has not prepared him, and relating essentially to his personal attitudes and moral beliefs, culture and the recognition that 'if I don't, somebody else--possibly less competent--will'.

  13. Results of the first EUSO-Balloon flight

    Science.gov (United States)

    Miyamoto, H.; Bertaina, M.; JEM-EUSO Collaboration

    2016-05-01

    EUSO-Balloon, a balloon-borne diffractive fluorescence telescope, was launched by the French Space Agency ONES from the Timmins base in Ontario (Canada) on August 25th in 2014. After reaching the floating altitude of about 38 km, EUSO-Balloon imaged the UV background for more than 5 hours before descending to ground using the key technologies of JEM-EUSO. A detailed and precise measurement of the UV background in different atmospheric and ground conditions was achieved. The instrument proved the capability of detecting Extensive Air Showers (EAS) by observing laser tracks with similar characteristics. This contribution will summarise the first results obtained concerning all the topics described above.

  14. Balloon dilation of congenital supravalvular pulmonic stenosis in a dog

    Science.gov (United States)

    Treseder, Julia R.

    2017-01-01

    Percutaneous balloon valvuloplasty is considered the standard of care for treatment of valvular pulmonic stenosis, a common congenital defect in dogs. Supravalvular pulmonic stenosis is a rare form of pulmonic stenosis in dogs and standard treatment has not been established. Although, there have been reports of successful treatment of supravalvular pulmonic stenosis with surgical and stenting techniques, there have been no reports of balloon dilation to treat dogs with this condition. Here, a case of supravalvular pulmonic stenosis diagnosed echocardiographically and angiographically in which a significant reduction in pressure gradient was achieved with balloon dilation alone is presented. PMID:27297421

  15. 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.)

  16. Current Status of a NASA High-Altitude Balloon-Based Observatory for Planetary Science

    Science.gov (United States)

    Varga, Denise M.; Dischner, Zach

    2015-01-01

    Recent studies have shown that progress can be made on over 20% of the key questions called out in the current Planetary Science Decadal Survey by a high-altitude balloon-borne observatory. Therefore, NASA has been assessing concepts for a gondola-based observatory that would achieve the greatest possible science return in a low-risk and cost-effective manner. This paper addresses results from the 2014 Balloon Observation Platform for Planetary Science (BOPPS) mission, namely successes in the design and performance of the Fine Pointing System. The paper also addresses technical challenges facing the new Gondola for High Altitude Planetary Science (GHAPS) reusable platform, including thermal control for the Optical Telescope Assembly, power generation and management, and weight-saving considerations that the team will be assessing in 2015 and beyond.

  17. Stingray balloon used in slender percutaneous coronary intervention for chronic total occlusion.

    Science.gov (United States)

    Wu, Eugene B; Ikari, Yuji

    2013-07-01

    Slender chronic total occlusion (CTO) percutaneous coronary intervention (PCI) using 5 Fr radial Ikari catheter is possible in simple CTO cases. We report a case where we initially thought the LAD CTO was short and easy, but we found that the CTO had a considerable amount of calcium and also some tortuosity, making simple wire crossing impossible. We used a Stingray balloon to perform re-entry by tracking the balloon over an Ultimate Bros 3 gram wire using an extension wire. We successfully punctured into true lumen and completed stenting through a slender 5 Fr system. This case demonstrates the beauty of combining the advances in CTO PCI from the East and the West together and also demonstrates the possibility of using the Stingray system in a 5 Fr guiding catheter.

  18. Improvement of Flexible Linear Stepping Actuator Driven by Pneumatic Balloons and Brakes

    Directory of Open Access Journals (Sweden)

    Eguchi Yuya

    2016-01-01

    Full Text Available The development of soft actuator for the rehabilitation device and power assisting devices has been required based on aging society. However, a flexible actuator that can generate both larger force and longer displacement has not been developed. It is also difficult to realize a flexible displacement sensor with long stroke while deforming its form according to the actuator’s shape. In the previous study, the flexible actuator with larger force and longer stroke that can adjust its stroke by giving stepping motion using pneumatic balloons and brakes was proposed and tested. However, the slipping of the pneumatic brake prevents the larger generated force. In this paper, the improved pneumatic brake using a pneumatic balloon and a mechanical chuck is described. The fundamental performance of the actuator using the improved brake is also described.

  19. Immediate Outcome of Balloon Mitral Valvuloplasty with JOMIVA Balloon during Pregnancy

    Science.gov (United States)

    Ramasamy, Ramona; Kaliappan, Tamilarasu; Gopalan, Rajendiran; Palanimuthu, Ramasmy; Anandhan, Premkrishna

    2017-01-01

    Introduction Rheumatic mitral stenosis is the most common Valvular Heart Disease encountered during pregnancy. Balloon Mitral Valvuloplasty (BMV) is one of the treatment option available if the symptoms are refractory to the medical management and the valve anatomy is suitable for balloon dilatation. BMV with Inoue balloon is the most common technique being followed worldwide. Over the wire BMV is a modified technique using Joseph Mitral Valvuloplasty (JOMIVA) balloon catheter which is being followed in certain centres. Aim To assess the immediate post procedure outcome of over the wire BMV with JOMIVA balloon. Materials and Methods Clinical and echocardiographic parameters of pregnant women with significant mitral stenosis who underwent elective BMV with JOMIVA balloon in our institute from 2005 to 2015 were analysed retrospectively. Severity of breathlessness (New York Heart Association Functional Class), and duration of pregnancy was included in the analysis. Pre procedural echocardiographic parameters which included severity of mitral stenosis and Wilkin’s scoring were analysed. Clinical, haemodynamic and echocardiographic outcomes immediately after the procedure were analysed. Results Among the patients who underwent BMV in our Institute 38 were pregnant women. Twenty four patients (63%) were in New York Heart Association (NYHA) Class III. All of them were in sinus rhythm except two (5%) who had atrial fibrillation. Thirty four patients (89.5%) were in second trimester of pregnancy at the time of presentation and four (10.5%) were in third trimester. Echocardiographic analysis of the mitral valve showed that the mean Wilkin’s score was 7.3. Mean mitral valve area pre procedure was 0.8 cm2. Mean gradient across the valve was 18 mmHg. Ten patients (26.5%) had mild mitral regurgitation and none had more than mild mitral regurgitation. Thirty six patients had pulmonary hypertension as assessed by tricuspid regurgitation jet velocity. All of them underwent BMV

  20. 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... STANDARDS: MANNED FREE BALLOONS Flight Requirements § 31.17 Performance: Climb. (a) Each balloon must be capable of climbing at least 300 feet in the first minute after takeoff with a steady rate of...

  1. 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.

  2. Functional brain imaging in irritable bowel syndrome with rectal balloon-distention by using fMRI

    Institute of Scientific and Technical Information of China (English)

    Yao-Zong Yuan; Ran-Jun Tao; Bin Xu; Jing Sun; Ke-Min Chen; Fei Miao; Zhong-Wei Zhang; Jia-Yu Xu

    2003-01-01

    AIM: Irritable bowel syndrome (IBS) is characterized by abdominal pain and changes in stool habits. Visceral hypersensitivity is a key factor in the pathophysiology of IBS. The aim of this study was to examine the effect of rectal balloon-distention stimulus by blood oxygenation leveldependent functional magnetic resonance imaging (BOLDfMRI) in visceral pain center and to compare the distribution,extent, and intensity of activated areas between IBS patients and normal controls. METHODS: Twenty-six patients with IBS and eleven normal controls were tested for rectal sensation, and the subjective pain intensity at 90 ml and 120 ml rectal balloon-distention was reported by using Visual Analogue Scale. Then, BOLDfMRI was performed at 30 ml, 60 ml, 90 ml, and 120 ml rectal balloon-distention in all subjects. RESULTS: Rectal distention stimulation increased the activity of anterior cingulate cortex (35/37), insular cortex (37/37),prefrontal cortex (37/37), and thalamus (35/37) in most cases.At 120 ml of rectal balloon-distention, the activation area and percentage change in MR signal intensity of the regions of interest (ROI) at IC, PFC, and THAL were significantly greater in patients with IBS than that in controls. Score of pain sensation at 90 ml and 120 ml rectal balloon-distention was significantly higher in patients with IBS than that in controls. CONCLUSION: Using fMRI, some patients with IBS can be detected having visceral hypersensitivity in response to painful rectal balloon-distention. fMRI is an objective brain imaging technique to measure the change in regional cerebral activation more precisely. In this study, IC and PFC of the IBS patients were the major loci of the CNS processing of visceral perception.

  3. 10 meter Sub-Orbital Large Balloon Reflector (LBR) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Besides serving as a launch vehicle, the carrier balloon provides a stable mount for the enclosed telescope. Looking up, the LBR will serve as a telescope. Looking...

  4. Ohmic scaling based on current diffusive ballooning mode

    Energy Technology Data Exchange (ETDEWEB)

    Yagi, Masatoshi; Itoh, Sanae [Kyushu Univ., Kasuga, Fukuoka (Japan). Research Inst. for Applied Mechanics; Fukuyama, Atsushi; Itoh, Kimitaka

    1996-01-01

    Based on the anomalous transport model due to current diffusive ballooning mode turbulence, the global energy confinement time in a tokamak with Ohmic heating is theoretically studied. Relations to empirical scaling laws are also discussed. (author)

  5. 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.

  6. Low Cost Variable Conductance Heat Pipe for Balloon Payload Project

    Data.gov (United States)

    National Aeronautics and Space Administration — While continuously increasing in complexity, the payloads of terrestrial high altitude balloons need a thermal management system to reject their waste heat and to...

  7. Balloon Pump with Floating Valves for Portable Liquid Delivery

    Directory of Open Access Journals (Sweden)

    Yuya Morimoto

    2016-03-01

    Full Text Available In this paper, we propose a balloon pump with floating valves to control the discharge flow rates of sample solutions. Because the floating valves were made from a photoreactive resin, the shapes of the floating valves could be controlled by employing different exposure patterns without any change in the pump configurations. Owing to the simple preparation process of the pump, we succeeded in changing the discharge flow rates in accordance with the number and length of the floating valves. Because our methods could be used to easily prepare balloon pumps with arbitrary discharge properties, we achieved several microfluidic operations by the integration of the balloon pumps with microfluidic devices. Therefore, we believe that the balloon pump with floating valves will be a useful driving component for portable microfluidic systems.

  8. The Hubble party balloon and the expanding universe

    Science.gov (United States)

    Zendri, G.; Rosi, T.; Oss, S.

    2016-09-01

    We show that the metaphor of the inflated balloon used to describe expanding space-time according to the Hubble law can be transformed into a simple laboratory experiment. We obtain, in terms of measured recession speeds and distances of ink dots drawn on a party balloon, easy renditions of various cosmological models, such as the static one and the Einstein-De Sitter universe.

  9. Small Research Balloons in a Physics Course for Education Majors

    Science.gov (United States)

    Bruhweiler, F. C.; Verner, E.; Long, T.; Montanaro, E.

    2013-12-01

    At The Catholic Univ. of America, we teach an experimental physics course entitled Physics 240: The Sun-Earth Connection, which is designed for the undergraduate education major. The emphasis is on providing hands-on experience and giving the students an exciting experience in physics. As part of this course, in the Spring 2013 semester, we instituted a project to plan, build, launch, and retrieve a small (~1.3 kg) research balloon payload. The payload flown was a small GPS unit that sent its position to an Internet site, a small wide-angle high-resolution video camera, and an analog refrigerator thermometer placed in the field of view of the camera. All data were stored on the camera sim-card. Students faced the problems of flying a small research balloon in the congested, densely populated Northeast Corridor of the US. They used computer simulators available on the Web to predict the balloon path and flight duration given velocities for the Jet Stream and ground winds, as well as payload mass and amount of helium in the balloon. The first flight was extremely successful. The balloon was launched 140 km NW of Washington DC near Hagerstown, MD and touched down 10 miles (16 km) NW of York, PA, within 1.6 km of what was predicted. The balloon reached 73,000 ft (22,000 m) and the thermometer indicated temperatures as low as -70 degrees Fahrenheit (-57 C) during the flight. Further balloon flights are planned in conjunction with this course. Additional exercises and experiments will be developed centered around these flights. Besides learning that science can be exciting, students also learn that science is not always easily predictable, and that these balloon flights give an understanding of many of problems that go into real scientific space missions. This project is supported in part by an educational supplement to NASA grant NNX10AC56G

  10. Analysis of current diffusive ballooning mode in tokamaks

    Energy Technology Data Exchange (ETDEWEB)

    Uchida, Morihisa [Faculty of Engineering, Okayama University, Okayama (Japan); Fukuyama, Atsushi [Kyoto Univ. (Japan). Dept. of Nuclear Engineering; Itoh, Kimitaka [National Inst. for Fusion Science, Toki, Gifu (Japan); Itoh, Sanae-I.; Yagi, Masatoshi [Kyushu Univ., Fukuoka (Japan). Research Inst. for Applied Mechanics

    2000-07-01

    The effect of finite gyroradius on the current diffusive ballooning mode is examined. Starting from the reduced MHD equations including turbulent transports, coupling with drift motion and finite gyroradius effect of ions, we derive a ballooning mode equation with complex transport coefficients. The eigenfrequency, saturation level and thermal diffusivity are evaluated numerically from the marginal stability condition. Preliminary results of their parameter dependence are presented. (author)

  11. Intrauterine tamponade balloon use in the treatment of uterine inversion

    OpenAIRE

    Haeri, Sina; Rais, Sheliza; Monks, Brian

    2015-01-01

    Uterine inversion is a rare but life-threatening obstetrical emergency that occurs when the fundus of the uterus prolapses through the cervix, hence turning the uterus inside out. In this case report, we present our experience using an intrauterine tamponade balloon for management of uterine inversion, and a review of the literature. The utility of an intrauterine tamponade balloon in cases of uterine inversion, especially when maternal medical conditions preclude the use of uterotonics, or r...

  12. Image-guided method for TLD-based in vivo rectal dose verification with endorectal balloon in proton therapy for prostate cancer

    Energy Technology Data Exchange (ETDEWEB)

    Hsi, Wen C.; Fagundes, Marcio; Zeidan, Omar [ProCure Proton Therapy Center, Oklahoma City, Oklahoma 73142 (United States); Hug, Eugen [ProCure Proton Therapy Centers, New York, New York 10016 (United States); Schreuder, Niek [ProCure Training and Development Center, Bloomington, Indiana 47404 (United States)

    2013-05-15

    Purpose: To present a practical image-guided method to position an endorectal balloon that improves in vivo thermoluminiscent dosimeter (TLD) measurements of rectal doses in proton therapy for prostate cancer. Methods: TLDs were combined with endorectal balloons to measure dose at the anterior rectal wall during daily proton treatment delivery. Radiopaque metallic markers were employed as surrogates for balloon position reproducibility in rotation and translation. The markers were utilized to guide the balloon orientation during daily treatment employing orthogonal x-ray image-guided patient positioning. TLDs were placed at the 12 o'clock position on the anterior balloon surface at the midprostatic plane. Markers were placed at the 3 and 9 o'clock positions on the balloon to align it with respect to the planned orientation. The balloon rotation along its stem axis, referred to as roll, causes TLD displacement along the anterior-posterior direction. The magnitude of TLD displacement is revealed by the separation distance between markers at opposite sides of the balloon on sagittal x-ray images. Results: A total of 81 in vivo TLD measurements were performed on six patients. Eighty-three percent of all measurements (65 TLD readings) were within +5% and -10% of the planning dose with a mean of -2.1% and a standard deviation of 3.5%. Examination of marker positions with in-room x-ray images of measured doses between -10% and -20% of the planned dose revealed a strong correlation between balloon roll and TLD displacement posteriorly from the planned position. The magnitude of the roll was confirmed by separations of 10-20 mm between the markers which could be corrected by manually adjusting the balloon position and verified by a repeat x-ray image prior to proton delivery. This approach could properly correct the balloon roll, resulting in TLD positioning within 2 mm along the anterior-posterior direction. Conclusions: Our results show that image-guided TLD

  13. Development of a tiny tandem balloon system for atmospheric observation

    Science.gov (United States)

    Saito, Yoshitaka; Yamada, Kazuhiko; Fujiwara, Masatomo

    2016-07-01

    A tandem balloon system with a combination of a zero-pressure balloon on top and a super-pressure balloon on the bottom has a unique trajectory characteristic, with different flight altitudes between day and night and thus with ascending and descending motions at dawn and dusk, respectively. This characteristic provides a unique opportunity to explore the atmosphere, e.g., the upper tropospheric and lower stratospheric region with cross-tropopause measurements twice a day. We started development of a tiny tandem balloon system using a 10 m^{3} super-pressure balloon and a 100 m^{3} zero-pressure balloon, with a capability of carrying 3 kg of payload. One of the scientific targets is to measure water vapor, cloud particles, and temperature around the tropical tropopause which is the entry point of the stratospheric and mesospheric meridional circulation. For the data transfer, the iridium satellite communication module, SBD9603 is used. In this paper, the current status of the development will be reported.

  14. Catching Comet's Particles in the Earth's Atmosphere by Using Balloons

    Science.gov (United States)

    Potashko, Oleksandr; Viso, Michel

    The project is intended to catch cometary particles in the atmosphere by using balloons. The investigation is based upon knowledge that the Earth crosses the comet’s tails during the year. One can catch these particles at different altitudes in the atmosphere. So, we will be able to gradually advance in the ability to launch balloons from low to high altitudes and try to catch particles from different comet tails. The maximum altitude that we have to reach is 40 km. Both methods - distance observation and cometary samples from mission Stardust testify to the presence of organic components in comet’s particles. It would be useful to know more details about this organic matter for astrobiology; besides, the factor poses danger to the Earth. Moreover, it is important to prove that it is possible to get fundamental scientific results at low cost. In the last 5 years launching balloons has become popular and this movement looks like hackers’ one - as most of them occur without launch permission to airspace. The popularity of ballooning is connected with low cost of balloon, GPS unit, video recording unit. If you use iPhone, you have a light solution with GPS, video, picture and control function in one unit. The price of balloon itself begins from $50; it depends on maximum altitude, payload weight and material. Many university teams realized balloon launching and reached even stratosphere at an altitude of 33 km. But most of them take only video and picture. Meanwhile, it is possible to carry out scientific experiments by ballooning, for example to collect comet particles. There is rich experience at the moment of the use of mineral, chemical and isotopic analysis techniques and data of the comet’s dust after successful landing of StarDust capsule with samples in 2006. Besides, we may use absolutely perfect material to catch particles in the atmosphere, which was used by cosmic missions such as Stardust and Japanese Hayabusa. As to balloon launches, we could use

  15. Effectiveness of balloon sinuplasty in patients with chronic rhinosinusitis without polyposis,

    Directory of Open Access Journals (Sweden)

    Cassiana Burtet Abreu

    2014-12-01

    Full Text Available Introduction: Balloon sinuplasty is a minimally invasive endoscopic procedure, developed with the aim of restoring patency of the paranasal sinuses ostia with minimal damage to the mucosa. Objective: To evaluate the effectiveness of balloon sinuplasty in patients with chronic rhinosinusitis. Methods: This was a prospective cohort study comprising 18 patients with chronic rhinosinusitis without polyposis who underwent balloon sinuplasty. Patients were evaluated for clinical criteria, quality of life (Sino-Nasal Outcome Questionnaire Test-20 SNOT-20], and computed tomography of the sinuses (Lund–Mackay staging preoperatively and three to six months after the procedure. Results: Out of 18 patients assessed, 13 were included, with a mean age of 39.9 ± 15.6 years. Ostia sinuplasty was performed in 24 ostia (four sphenoid, ten frontal, and ten maxillary sinus. At the follow-up, 22 (92% ostia were patent and there was no major complication. There was symptomatic improvement (SNOT-20, with Cronbach coefficients for consistency of the questionnaire items of 0.86 (95% CI: 0.73–0.94 preoperatively and of 0.88 (95% CI: 0.77–0.95 postoperatively, the difference being statistically significant (p <0.001. In addition, there was marked reduction of the computed tomography signs, an average of 4.2 point score (p <0.001. Conclusion: Sinuplasty is effective in reducing symptoms and improving quality of life as a treatment option for chronic rhinosinusitis in selected patients.

  16. 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.

  17. Segmentation of pituitary adenoma: a graph-based method vs. a balloon inflation method.

    Science.gov (United States)

    Egger, Jan; Zukić, Dženan; Freisleben, Bernd; Kolb, Andreas; Nimsky, Christopher

    2013-06-01

    Among all abnormal growths inside the skull, the percentage of tumors in sellar region is approximately 10-15%, and the pituitary adenoma is the most common sellar lesion. A time-consuming process that can be shortened by using adequate algorithms is the manual segmentation of pituitary adenomas. In this contribution, two methods for pituitary adenoma segmentation in the human brain are presented and compared using magnetic resonance imaging (MRI) patient data from the clinical routine: Method A is a graph-based method that sets up a directed and weighted graph and performs a min-cut for optimal segmentation results: Method B is a balloon inflation method that uses balloon inflation forces to detect the pituitary adenoma boundaries. The ground truth of the pituitary adenoma boundaries - for the evaluation of the methods - are manually extracted by neurosurgeons. Comparison is done using the Dice Similarity Coefficient (DSC), a measure for spatial overlap of different segmentation results. The average DSC for all data sets is 77.5±4.5% for the graph-based method and 75.9±7.2% for the balloon inflation method showing no significant difference. The overall segmentation time of the implemented approaches was less than 4s - compared with a manual segmentation that took, on the average, 3.9±0.5min.

  18. Reflood experiments in rod bundles with flow blockages due to clad ballooning

    Energy Technology Data Exchange (ETDEWEB)

    Moon, S.K.; Kim, J.; Kim, K.; Kim, B.J.; Park, J.K.; Youn, Y.J.; Choi, H.S.; Song, C.H. [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2016-07-15

    Clad ballooning and the resulting partial flow blockage are one of the major thermal-hydraulic concerns associated with the coolability of partially blocked cores during a loss-of-coolant accident (LOCA). Several in-pile tests have shown that fuel relocation causes a local power accumulation and a high thermal coupling between the clad and fuel debris in the ballooned regions. However, previous experiments in the 1980s did not take into account the fuel relocation phenomena and resulting local power increase in the ballooned regions. The present paper presents the results of systematic investigations on the coolability of rod bundles with flow blockages. The experiments were mainly performed in 5 x 5 rod bundles, 2 x 2 rod bundles and other test facilities. The experiments include a reflood heat transfer, single-phase convective heat transfer, flow redistributions phenomena, and droplet break-up behavior. The effects of the fuel relocation and resulting local power increase were investigated using a 5 x 5 rod bundle. The fuel relocation phenomena increase the peak cladding temperature.

  19. Gamma ray Large Area Space Telescope (GLAST) Balloon Flight Engineering Model Overview

    CERN Document Server

    Thompson, D J; Williams, S; Grove, J E; Mizuno, T; Sadrozinski, H F W

    2002-01-01

    The Gamma Ray Large Area Space Telescope (GLAST) Large Area Telescope (LAT) is a pair-production high-energy (>20 MeV) gamma-ray telescope being built by an international partnership of astrophysicists and particle physicists for a satellite launch in 2006, designed to study a wide variety of high-energy astrophysical phenomena. As part of the development effort, the collaboration has built a Balloon Flight Engineering Model (BFEM) for flight on a high-altitude scientific balloon. The BFEM is approximately the size of one of the 16 GLAST-LAT towers and contains all the components of the full instrument: plastic scintillator anticoincidence system (ACD), high-Z foil/Si strip pair-conversion tracker (TKR), CsI hodoscopic calorimeter (CAL), triggering and data acquisition electronics (DAQ), commanding system, power distribution, telemetry, real-time data display, and ground data processing system. The principal goal of the balloon flight was to demonstrate the performance of this instrument configuration under c...

  20. Focal plane actuation to achieve ultra-high resolution on suborbital balloon payloads

    Science.gov (United States)

    Scowen, Paul A.; Miller, Alex; Challa, Priya; Veach, Todd; Groppi, Chris; Mauskopf, Phil

    2014-07-01

    Over the past few years there has been remarkable success flying imaging telescope systems suspended from suborbital balloon payload systems. These imaging systems have covered optical, ultraviolet, sub-­-millimeter and infrared passbands (i.e. BLAST, STO, SBI, Fireball and others). In recognition of these advances NASA is now considering ambitious programs to promote planetary imaging from high altitude at a fraction of the cost of similar fully orbital systems. The challenge with imaging from a balloon payload is delivering the full diffraction-­-limited resolution of the system from a moving payload. Good progress has been made with damping mechanisms and oscillation control to remove most macroscopic movement in the departures of the imaging focal plane from a static configuration, however a jitter component remains that is difficult to remove using external corrections. This paper reports on work to demonstrate in the laboratory the utility and performance of actuating a detector focal plane (of whatever type) to remove the final jitter terms using an agile hexapod design. The input to this demonstration is the jitter signal generated by the pointing system of a previously flown balloon mission (the Stratospheric Terahertz Observatory, STO). Our group has a mature jitter compensation system that thermally isolates the control head from the focal plane itself. This allows the hexapod to remain at ambient temperature in a vacuum environment with the focal plane cooled to cryogenic temperatures. Our lab design mounts the focal plane on the hexapod in a custom cryostat and delivers an active optical stimulus together with the corresponding jitter signal, using the actuation of the hexapod to correct for the departures from a static, stable configuration. We believe this demonstration will make the case for inclusion of this technological solution in future balloon-­-borne imaging systems requiring ultra-­-high resolution.

  1. A comparison of balloon-expandable-stent implantation with balloon angioplasty in patients with coronary artery disease. Benestent Study Group.

    OpenAIRE

    Serruys, P.W.; de Jaegere, P; Kiemeneij, F.; Macaya, C; Rutsch, W; Heyndrickx, G.; Emanuelsson, H.; Marco, J.; Legrand, Victor; Materne, P.

    1994-01-01

    BACKGROUND: Balloon-expandable coronary-artery stents were developed to prevent coronary restenosis after coronary angioplasty. These devices hold coronary vessels open at sites that have been dilated. However, it is unknown whether stenting improves long-term angiographic and clinical outcomes as compared with standard balloon angioplasty. METHODS: A total of 520 patients with stable angina and a single coronary-artery lesion were randomly assigned to either stent implantation (262 patients)...

  2. Burn Injury Arise From Flying Balloon Toys

    Directory of Open Access Journals (Sweden)

    Yalcin Kulahci

    2007-08-01

    Full Text Available Many of peoples are faced minor or major burn injuries in their life. Even the most widespread burn cause is flame injuries, too different burn cause pointed out in literature like Acetylen burns. The cases which imply in literature, mostly causes from explosion of high pressure acetylene tube, metal oxygene patch flame or carbide lamp using from cave explorers. An interesting acetylene burn cause in Turkey was publised by the authors. This cases was to come into being from flying toy balloons flame. 80 person was injured from flying toy ballons flame in a meeting in 2002. Although this potential risks of acetylene, helium have not any of some risk. But helium was provided from other countries and have more price. The injuries which caused from acetylene burns like 1st -2nd degree burns. Consequently that was known helium is more avaliable for using in toy sector, and never cause burn injuries like this. [TAF Prev Med Bull 2007; 6(4.000: 291-296

  3. Balloon borne arcsecond pointer feasibility study

    Science.gov (United States)

    Ward, Philip R.; Deweese, Keith D.

    2003-08-01

    A major hurdle in extending the range of experiments for which balloon vehicles are useful has been the imposition of the gondola dynamics on the accuracy with which an instrument can be kept pointed at a celestial target. In this paper, the foundation for a high fidelity controller simulation is presented and it is shown that sub-arcsecond pointing stability can be achieved for a large instrument pointing at an inertial target. The flexibility of the flight train is represented through generalized modal analysis. A multiple controller scheme is introduced with a coarse azimuth pointer and a pitch-yaw gimbal mount for fine pointing. An analysis and demonstration of the necessity in eliminating static friction are provided along with a solution to eliminate static friction from the system dynamics. A control scheme involving linear accelerometers for enhanced disturbance rejection is also presented. This paper establishes that the proposed control strategy can be made robustly stable with significant design margins. Also demonstrated is the efficacy of the proposed system in rejecting disturbances larger than those considered realistic.

  4. Burn Injury Arise From Flying Balloon Toys

    Directory of Open Access Journals (Sweden)

    Yalcin Kulahci

    2007-08-01

    Full Text Available Many of peoples are faced minor or major burn injuries in their life. Even the most widespread burn cause is flame injuries, too different burn cause pointed out in literature like Acetylen burns. The cases which imply in literature, mostly causes from explosion of high pressure acetylene tube, metal oxygene patch flame or carbide lamp using from cave explorers. An interesting acetylene burn cause in Turkey was publised by the authors. This cases was to come into being from flying toy balloons flame. 80 person was injured from flying toy ballons flame in a meeting in 2002. Although this potential risks of acetylene, helium have not any of some risk. But helium was provided from other countries and have more price. The injuries which caused from acetylene burns like 1st -2nd degree burns. Consequently that was known helium is more avaliable for using in toy sector, and never cause burn injuries like this. [TAF Prev Med Bull. 2007; 6(4: 291-296

  5. Optical coherence tomography monitoring of angioplasty balloon inflation in a deployment tester

    Science.gov (United States)

    Azarnoush, Hamed; Vergnole, Sébastien; Bourezak, Rafik; Boulet, Benoit; Lamouche, Guy

    2010-08-01

    We present an innovative integration of an intravascular optical coherence tomography probe into a computerized balloon deployment system to monitor the balloon inflation process. The high-resolution intraluminal imaging of the balloon provides a detailed assessment of the balloon quality and, consequently, a technique to improve the balloon manufacturing process. A custom-built swept-source optical coherence tomography system is used for real-time imaging. A semicompliant balloon with a nominal diameter of 4 mm is fabricated for the experiments. Imaging results correspond to balloon deployment in air and inside an artery phantom. A characterization of the balloon diameter, wall thickness, compliance, and elastic modulus is provided, based on image segmentation. Using the images obtained from the probe pullback, a three-dimensional visualization of the inflated balloon is presented.

  6. Balloon-expandable covered stent therapy of complex endovascular pathology.

    Science.gov (United States)

    Giles, Heath; Lesar, Christopher; Erdoes, Luke; Sprouse, Richard; Myers, Stuart

    2008-11-01

    The current study was designed to investigate our hypotheses that balloon-expandable covered stents display acceptable function over longitudinal follow-up in patients with complex vascular pathology and provide a suitable alternative for the treatment of recurrent in-stent restenosis. All stents were Atrium iCast, which is a balloon-mounted, polytetrafluoroethylene-covered stent with a 6F/7F delivery system. A retrospective review was performed of 49 patients with 66 stented lesions. Data were analyzed with life tables and t-tests. The most commonly treated vessels were the iliac (61%) and renal (24%) arteries. Indications for covered stent placement were unstable atheromatous lesions (50%), recurrent in-stent restenosis (24%), aneurysm (8%), aortic bifurcation reconstruction (7.5%), dissection (4.5%), endovascular aneurysm repair-related (4.5%), and stent fracture (1.5%). Patency was assessed by angiogram or duplex ultrasonography. The primary end point was patency and secondary end points were technical success and access-site complications. Mean follow-up was 13 months (range 1.5-25). The technical success rate was 97%. Unsuccessful outcomes were due to deployment error (n=1) and stent malpositioning (n=1). The cohort (n=64) 6- and 12-month primary patency rates were 96% and 84%, respectively. Twelve-month assisted primary patency was 98%. Iliac artery stents (n=38) had a primary patency of 97% at 6 months and 84% at 12 months with an assisted primary patency of 100% at 12 months. Renal artery stents (n=16) had a primary patency of 92% at 6 months and 72% at 12 months with an assisted primary patency of 92% at 6 and 12 months. Stents placed for recurrent in-stent restenosis (n=16) had a primary patency of 85%, assisted primary patency of 93%, and a 15% restenosis rate at 12 months. Specifically, stents placed for renal artery recurrent in-stent restenosis (n=10) had a primary patency of 73%, assisted primary patency of 82%, and a restenosis rate of 27%. The

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

    Science.gov (United States)

    Chen, Chen; Li, Donghua; Wang, Zhiguo; Li, Tong; Liu, Xunwei; Zhong, Jian

    2016-01-01

    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.

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

    Science.gov (United States)

    Chen, Chen; Li, Donghua; Wang, Zhiguo; Li, Tong; Liu, Xunwei; Zhong, Jian

    2016-01-01

    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. PMID:26963808

  9. 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.

  10. Dosimetry of charged and neutral particles onboard a stratospheric balloon

    Science.gov (United States)

    Dönsdorf, Esther Miriam; Burmeister, Soenke; Heber, Bernd; Benton, Eric; Berger, Thomas

    The interaction of the primary galactic cosmic rays with constituents of the atmosphere leads to a complex secondary radiation field at high altitudes. Of special interest for aviation and thereby also for radiation protection is the height up to 30 km where the radiation field consists of charged and neutral particles. For the determination of the dose rates up to this altitude in the Earth's atmosphere a stratopheric balloon flight will be performed in central Oklahoma which has a cutoff rigidity of about 4 GV. Onboard there will be two different active radiation detector systems to measure the dose of charged and neutral particles in the stratosphere. The first one is a silicon telescope which consists of two 2 cm2 silicon PIN-photodiodes used as semiconductor detectors. This instrument will mainly be used to measure the charged component of the radiation field due to the fact that the silicon detectors have a rather low efficiency for the detection of neutrons and gammas with energies higher than 60 keV. The second instrument is a so called phoswich detector. It is composed of two dissimilar scintillators optically coupled to each other and to a common photomultiplier tube. For this experimental setup a combination of a fast plastic scintillator BC412 and a slow inorganic scintillator CsI(Na) is used. The pulses from the two scintillators will be separated by applying pulse shape analysis. These two different scintillator materials have been chosen because BC412 is hydrogen rich and thus the cross section for fast neutrons is relatively high and CsI(Na) has a high cross section for gamma radiation. The objective of the phoswich detector is to distinguish between gammas and neutrons but it is also possible to measure charged particles with this setup. The aim of the balloon flight is to determine the dose measured with these two different instruments and in particular to differentiate between the dose induced by charged particles and by the different neutral

  11. Intragastric balloon followed by diet vs intragastric balloon followed by another balloon: a prospective study on 100 patients.

    Science.gov (United States)

    Genco, Alfredo; Cipriano, Massimiliano; Bacci, Vincenzo; Maselli, Roberta; Paone, Emanuela; Lorenzo, Michele; Basso, Nicola

    2010-11-01

    Aim of this study is to compare the efficacy of BioEnterics Intragastric Balloon (BIB®) followed by diet with BIB followed by another BIB. A prospective study was designed: a homogeneous group of 100 obese patients (age range 25-35, BMI range 40.0-44.9, M/F ratio 1/4) was allocated into two groups according to procedure: BIB (6 months) followed by diet therapy (7 months; group A = 50 pts), BIB positioning followed by another BIB after 1 month (group B = 50 pts). Baseline demographics were similar in both groups (Group A 10M/40F; mean age 31.4 ± 2.6; range 25-35; mean weight 106.3 ± 12.5 Kg; range 88-150; mean BMI 42.6±2.7 Kg/m(2); range 40.2-43.8; Group B 10M/40F; mean age 32.1 ± 2.1; range 25-35; mean weight 107.1 ± 11.9 Kg; range 90-150; mean BMI 42.9 ± 2.3; range 40.2-43.9). In both groups, weight loss parameters (Kg, BMI, and % EBL) were considered. Statistics were by Fisher's exact test (p < 0.05 was considered significant). At the time of 1st BIB removal, weight loss parameters in both groups were not significantly different: Group A: mean weight was 83.7±19.1 (range 52-151); mean BMI 34.2 ± 3.9 (range 32.4-43.8); and mean %EBL 43.5 ± 21.1 (range 0-68). Group B: mean weight was 84.9 ± 18.3 (range 50-148); mean BMI 34.8 ± 3.3 (range 32.4-43.8); and mean % EBL 45.2 ± 22.5% (range 0-68). At the study end, weight loss parameters were significantly lower in patients who underwent consecutive BIB (p < 0.05): mean BMI was 30.9 ± 7.2 Kg/m(2) (range 24-40), and 35.9 ± 9.7 Kg/m(2) (range 34-42); mean % EBL was 51.9 ± 24.6% (range 0-100) and 25.1 ± 26.2% (range 0-100) in group B and A, respectively. As compared with diet, a second intragastric balloon can be positioned without difficulties, achieving good results with continuous weight loss.

  12. Proliferation kinetics of paramecium tetraurelia in balloon-borne experiments

    Energy Technology Data Exchange (ETDEWEB)

    Croute, F.; Soleilhavoup, J.P.; Vidal, S.; Rousseille, R.; Planel, H.

    1982-06-01

    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.

  13. Understanding cosmic rays with Balloon and Space Experiments

    Energy Technology Data Exchange (ETDEWEB)

    Picozza, P., E-mail: piergiorgio.picozza@roma2.infn.it [University of Rome Tor Vergata, Department of Physics, Via della Ricerca Scientifica 1, 00133 Rome (Italy); INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome (Italy); Di Felice, V. [INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome (Italy)

    2013-10-15

    Measurements of cosmic rays provide important information on their sources and on the mechanisms of acceleration and propagation of cosmic particles through the Galaxy. Positrons and antiprotons in cosmic rays are also the major candidates for searching signals from annihilation of dark matter and contributions from other exotic sources as nearby pulsars. Many balloon-borne experiments have been performed since the sixties, obtaining important results that strongly suggested the realization of the PAMELA and Fermi satellite missions, the latter mainly for gamma rays, and AMS-02 on the ISS. The precision of the measurements and the high statistics highlighted unexpected features in the cosmic particle energy spectra that are setting strong constraints to the nature of Dark Matter and are contributing to change our basic vision of their origin and propagation. The continuous particle detection in space experiments is allowing a constant monitoring of the solar activity and detailed study of the solar modulation for a long period, giving important improvements to the comprehension of the heliosphere mechanisms.

  14. Right ventricular function before and after percutaneous balloon mitral valvuloplasty.

    Science.gov (United States)

    Burger, W; Brinkies, C; Illert, S; Teupe, C; Kneissl, G D; Schräder, R

    1997-01-01

    Aim of this study was to evaluate right ventricular performance in patients with mitral stenosis and its modification by balloon valvuloplasty. Right ventricular volumes of 24 patients with postrheumatic mitral stenosis were determined by thermodilution 1 or 2 days before and 1 or 2 days after valvuloplasty. Right ventricular ejection fraction at rest was 43 (36-47)% (median and interquartile range). Right ventricular end-diastolic volume was 100 (86-119) ml/m2. Supine bicycle exercise (50 Watt) reduced right ventricular ejection fraction to 30 (29-37)% (P volume to 124 (112-141) ml/m2 (P improvement of right ventricular ejection fraction correlated inversely with the value of this parameter before valvuloplasty (r = -0.88, P volume (r = 0.57, P < 0.01). The right ventricular function curve, disturbed before commissurotomy, was reestablished by the procedure. In conclusion, at the here investigated stage of mitral stenosis right ventricular function is reversibly impaired. This is predominantly caused by the hemodynamic consequences of the valvular defect and not by an impairment of right ventricular myocardial function.

  15. The Balloon-borne Large Aperture Submillimeter Telescope: BLAST

    CERN Document Server

    Pascale, E; Bock, J J; Chapin, E L; Chung, J; Devlin, M J; Dicker, S; Griffin, M; Gundersen, J O; Halpern, M; Hargrave, P C; Hughes, D H; Klein, J; MacTavish, C J; Marsden, G; Martin, P G; Martin, T G; Mauskopf, P; Netterfield, C B; Olmi, L; Patanchon, G; Rex, M; Scott, D; Semisch, C; Thomas, N; Truch, M D P; Tucker, C; Tucker, G S; Viero, M P; Wiebe, D V

    2007-01-01

    The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) is a sub-orbital survey-experiment designed to study the evolutionary history and processes of star formation in local galaxies (including the Milky Way) and galaxies at cosmological distances. The BLAST continuum camera, which consists of 270 detectors distributed between 3 arrays, observes simultaneously in broad-band (30%) spectral-windows at 250, 350, and 500 micron. The optical design is based on a 2m diameter Cassegrain telescope, providing a diffraction-limited resolution of 30" at 250 micron. The gondola pointing system enables raster-like maps of arbitrary geometry, with a repeatable positional accuracy of ~30" post-flight pointing reconstruction to ~<5" rms is also achieved. The on-board telescope control software permits autonomous execution of a pre-selected set of maps, with the option of manual intervention. In this paper we describe the primary characteristics and measured in-flight performance of BLAST. Since a test-flight in ...

  16. Extradural balloon obliteration of the empty sella report of three cases (intrasellar balloon obliteration).

    Science.gov (United States)

    Gazioğlu, N; Akar, Z; Ak, H; Işlak, C; Koçer, N; Seçkin, M S; Kuday, C

    1999-01-01

    Empty sella syndrome is an anatomical and clinical entity composed of intrasellar reposition of the CSF and compression of the pituitary tissue, resulting in a clinical picture of headache, visual field defect, CSF rhinorrhea and some mild endocrinological disturbances. While some cases are primary with no appreciable aetiology, secondary cases are associated with prior operation or radiotherapy of the region. In our series, 3 patients with primary empty sella syndrome were treated by the current approach of extradural filling of the sellar cavity. This technique was first described by Guiot and widely accepted thereafter. We used a detachable silicon balloon filled with HEMA or liquid silicone for obliteration of the sellar cavity and obtained clinically satisfactory results without complications. Visual symptoms regressed and headache disappeared. But at long term follow-up all the balloons were found to be deflated. Despite the facility and efficacy of the technique we do not recommend it in the treatment of the empty sella because the filling of the sella is only transient and relapses may occur.

  17. Balloon dacryocystoplasty: Incomplete versus complete obstruction of the nasolacrimal system

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jeong Min; Lee, Sang Hoon; Han, Young Min; Chung, Gyung Ho; Kim, Chong Soo; Choi, Ki Chul [Chung Ang University College of Medicine, Seoul (Korea, Republic of); Song, Ho Young [Asan Medical Center, University of Ulsan College of Medicine, Seoul (Korea, Republic of)

    1993-07-15

    Balloon dilatation of nasolacrimal drainage apparatus was attempted for the treatment of stenoses or obstructures of the nasolacrimal system in 49 eyes of 41 consecutive patients with complete obstructions and 16 eyes of 14 patients with incomplete obstructions. These two groups were compared with regards to the effectiveness of balloon dacryocystoplasty. All patients suffered from severe epiphora had already undergone multiple probings. A 0.018 inch hair or ball guide wire was introduced through the superior punctum into the inferior meatus of the nasal cavity and pulled out through the nasal aperture using a hemostat under nasal endoscopy. A deflated angiography balloon catheter was then introduced in a retrograde direction and dilated under fluoroscopic control. No major complications occurred in any of the patients. At 7 days after balloon dilatation, 25 of 49 eyes with complete obstruction demonstrated improvement in epiphora (initial success rate: 51.0%) and among them 17 eyes showed complete resolution of symptoms. Reocclusion occurred in 12 of the 25 eyes with initial improvement at the 2 months follow up. For the 16 eyes with incomplete obstruction, and improvement of epiphora was attained in 11 eyes (initial success rate 68.8%): 5 of these eyes showed complete resolution of epiphora, and 3 was failed to maintain initial improvement at the 2 month follow up. Although this study demonstrate that results of balloon dacryocystoplasty are not encouraging because of the high failure and recurrence rate, balloon dacryocystoplasty is a simple and safe nonsurgical technique that can be used to treat for obstructions of the nasolacrimal system. In addition, balloon dacryocystoplasty shows better results in incomplete obstruction than in complete obstruction than complete obstruction of the nasolacrimal system.

  18. 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.

  19. Complexity Analysis of Balloon Drawing for Rooted Trees

    CERN Document Server

    Lin, Chun-Cheng; Poon, Sheung-Hung; Fan, Jia-Hao

    2010-01-01

    In a balloon drawing of a tree, all the children under the same parent are placed on the circumference of the circle centered at their parent, and the radius of the circle centered at each node along any path from the root reflects the number of descendants associated with the node. Among various styles of tree drawings reported in the literature, the balloon drawing enjoys a desirable feature of displaying tree structures in a rather balanced fashion. For each internal node in a balloon drawing, the ray from the node to each of its children divides the wedge accommodating the subtree rooted at the child into two sub-wedges. Depending on whether the two sub-wedge angles are required to be identical or not, a balloon drawing can further be divided into two types: even sub-wedge and uneven sub-wedge types. In the most general case, for any internal node in the tree there are two dimensions of freedom that affect the quality of a balloon drawing: (1) altering the order in which the children of the node appear in...

  20. Restenosis following balloon dilation of benign esophageal stenosis

    Institute of Scientific and Technical Information of China (English)

    Ying-Sheng Cheng; Ming-Hua Li; Ren-Jie Yang; Hui-Zhen Zhang; Zai-Xian Ding; Qi-Xin Zhuang; Zhi-Ming Jiang; Ke-Zhong Shang

    2003-01-01

    AIM: To elucidate the mechanism of restenosis following balloon dilation of benign esophageal stenosis.METHODS: A total of 49 rats with esophageal stenosis were induced in 70 rats using 5 ml of 50 % sodium hydroxide solution and the double-balloon method, and an esophageal restenosis (RS) model was developed by esophageal stenosis using dilation of a percutaneous transluminal coronary angioplasty (PTCA) balloon catheter. These 49 rats were divided into two groups: rats with benign esophageal stricture caused by chemical burn only (control group, n=21) and rats with their esophageal stricture treated with balloon catheter dilation (experimental group, n=28). Imaging analysis and immunohistochemistry were used for both quantitative and qualitative analyses of esophageal stenosis and RS formation in the rats, respectively.RESULTS: Cross-sectional areas and perimeters of the esophageal mucosa layer, muscle layer, and the entire esophageal layers increased significantly in the experimental group compared with the control group. Proliferating cell nuclear antigen (PCNA) was expressed on the 5th day after dilation, and was still present at 1 month. Fibronectin (FN)was expressed on the 1st day after dilation, and was still present at 1 month.CONCLUSION: Expression of PCNA and FN plays an important role in RS after balloon dilation of benign esophageal stenosis.

  1. Ideal ballooning modes, shear flow and the stable continuum

    Science.gov (United States)

    Taylor, J. B.

    2012-11-01

    There is a well-established theory of ballooning modes in a toroidal plasma. The cornerstone of this is a local eigenvalue λ on each magnetic surface—which also depends on the ballooning phase angle k. In stationary plasmas, λ(k) is required only near its maximum, but in rotating plasmas its average over k is required. Unfortunately in many cases λ(k) does not exist for some range of k, because the spectrum there contains only a stable continuum. This limits the application of the theory, and raises the important question of whether this ‘stable interval’ gives rise to significant damping. This question is re-examined using a new, simplified, model—which leads to the conclusion that there is no appreciable damping at small shear flow. In particular, therefore, a small shear flow should not affect ballooning mode stability boundaries.

  2. Ideal MHD Ballooning modes, shear flow and the stable continuum

    CERN Document Server

    Taylor, J B

    2012-01-01

    There is a well established theory of Ballooning modes in a toroidal plasma. The cornerstone of this is a local eigenvalue lambda on each magnetic surface - which also depends on the ballooning phase angle k. In stationary plasmas lambda(k) is required only near its maximum, but in rotating plasmas its average over k is required. Unfortunately in many case lambda(k) does not exist for some range of k, because the spectrum there contains only a stable continuum. This limits the application of the theory, and raises the important question of whether this "stable interval" gives rise to significant damping. This question is re-examined using a new, simplified, model - which leads to the conclusion that there is no appreciable damping at small shear flow. In particular, therefore, a small shear flow should not affect Ballooning mode stability boundaries.

  3. Tokamak resistive magnetohydrodynamic ballooning instability in the negative shear regime

    Institute of Scientific and Technical Information of China (English)

    Shi Bing-Ren; Lin Jian-Long; Li Ji-Quan

    2007-01-01

    Improved confinement of tokamak plasma with central negative shear is checked against the resistive ballooning mode. In the negative shear regime, the plasma is always unstable for purely growing resistive ballooning mode. For a simplest tokamak equilibrium model, the s-α model, characteristics of this kind of instability are fully clarified by numerically solving the high n resistive magnetohydrodynamic ballooning eigen-equation. Dependences of the growth rate on the resistivity, the absolute shear value, the pressure gradient are scanned in detail. It is found that the growth rate is a monotonically increasing function of a while it is not sensitive to the changes of the shear s, the initial phase θ0 and the resistivity parameter εR.

  4. 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

  5. To sail the skies of Mars - Scientific ballooning on the red planet

    Science.gov (United States)

    Gaidos, Eric J.; Burke, James D.

    1988-01-01

    Balloons represent a novel approach to exploring the surface of Mars. One promising aerostat system incorporates a solar-powered balloon as a means of generating diurnally varying lift and so can 'hop' across the surface, obtaining detailed information at a large number of sites. Two important areas of research and testing are underway on solar balloon technology and balloon payload design. The solar balloon concept has been demonstrated on earth, but more work is needed on a 'flyable' version for Mars. Particular attention must be paid to radiation heat transfer and aerodynamic effects. A special 'snake' payload concept has been demonstrated that allows for balloon system traverses of the surface and provides a usable instrument platform. A balloon system of this type could obtain unique surface imaging and physical and chemical data. The flight of the balloon also provides in situ atmospheric boundary-layer and circulation measurements.

  6. Balloon vetebroplasty with calcium phosphate cement augmentation for direct restoration of traumatic thoracolumbar vertebral fractures

    NARCIS (Netherlands)

    Verlaan, JJ; van Helden, WH; Oner, FC; Verbout, AJ; Dhert, WJA

    2002-01-01

    Study Design. A human cadaveric model was used to evaluate balloon vertebroplasty in traumatic vertebral fractures. Objectives. To assess the feasibility and safety of balloon vertebroplasty followed by calcium phosphate cement augmentation to prevent recurrent kyphosis. Summary of Background Data.

  7. Matrix metalloproteinase inhibition reduces adventitial thickening and collagen accumulation following balloon dilation

    NARCIS (Netherlands)

    Sierevogel, MJ; Velema, E; van der Meer, FJ; Nijhuis, MO; de Kleijn, DPV; Borst, C; Pasterkamp, G

    2002-01-01

    Objective: Constrictive arterial remodeling following balloon angioplasty has been related to adventitial collagen accumulation and subsequent thickening and can be prevented by matrix ructalloprotemase (MMP) inhibition. Following balloon dilation, we examined the effect of MMP inhibition on colla-e

  8. Evolution of NASA Scientific Ballooning and Particle Astrophysics Research

    Science.gov (United States)

    Jones, William Vernon

    2017-01-01

    Particle astrophysics research has a history in ballooning that spans over 100 years, ever since Victor Hess discovered cosmic rays on a manned balloon in 1912. The NASA Particle Astrophysics Program currently covers the origin, acceleration and transport of Galactic cosmic rays, plus the Nature of Dark Matter and Ultrahigh Energy Neutrinos. Progress in each of these topics has come from sophisticated instrumentation flown on Long Duration Balloon (LDB) flights around Antarctica for more than two decades. Super Pressure Balloons (SPB) and International Space Station (ISS) platforms are emerging opportunities that promise major steps forward for these and other objectives. NASA has continued development and qualification flights leading to SPB flights capable of supporting 1000 kg science instruments to 33 km for upwards of hundred day missions, with plans for increasing the altitude to 38 km. This goal is even more important now, in view of the Astro2010 Decadal Study recommendation that NASA should support Ultra-Long Duration Balloon (ULDB) flight development for studies of particle astrophysics, cosmology and indirect detection of dark matter. The mid-latitude test flight of an 18.8 MCF SPB launched from Wanaka, NZ in 2015 achieved 32 days of nearly constant altitude exposure, and an identical SPB launched from Wanaka in 2016 with a science payload flew for 46 days. Scientific ballooning as a vital infrastructure component for cosmic ray and general astrophysics investigations, including training for young scientists, graduate and undergraduate students, leading up to the 2020 Decadal Study and beyond, will be presented and discussed.

  9. Near Space Lab-Rat Experimentation using Stratospheric Balloon

    Science.gov (United States)

    Buduru, Suneel Kumar; Reddy Vizapur, Anmi; Rao Tanneeru, Venkateswara; Trivedi, Dharmesh; Devarajan, Anand; Pandit Manikrao Kulkarni, MR..; Ojha, Devendra; Korra, Sakram; Neerudu, Nagendra; Seng, Lim; Godi, Stalin Peter

    2016-07-01

    First ever balloon borne lab-rat experiment up to near space stratospheric altitude levels carried out at TIFR Balloon Facility, Hydeabad using zero pressure balloons for the purpose of validating the life support system. A series of two balloon experiments conducted under joint collaboration with IN.Genius, Singapore in the year 2015. In these experiments, three lab-rats sent to stratosphere in a pressurized capsule designed to reach an altitude of 30 km by keeping constant pressure, temperature and maintained at a precise rate of oxygen supply inside the capsule. The first experiment conducted on 1 ^{st} February, 2015 with a total suspended weight of 225 kg. During the balloon ascent stage at 18 km altitude, sensors inside the capsule reported drastic drop in internal pressure while oxygen and temperatures maintained at correct levels resulted in premature fligt termination at 20.1 km. All the three lab-rats recovered without life due to the collapse of their lungs caused by the depressurization inside the capsule. The second experiment conducted on 14th March, 2015 using a newly developed capsule with rectification of depressurization fault by using improved sealing gaskets and hermitically sealed connectors for sending lab-rats again to stratosphere comprising a total suspended load of 122.3 kg. The balloon flight was terminated after reaching 29.5 km in 110 minutes and succesfully recovered all the three lab-rats alive. This paper focuses on lessons learnt of the development of the life support system as an integral pressurized vessel, flight control instrumentation, flight simulation tests using thermo-vaccum chamber with pre-flight operations.

  10. Paclitaxel-coated balloons - Survey of preclinical data.

    Science.gov (United States)

    Schnorr, B; Kelsch, B; Cremers, B; Clever, Y P; Speck, U; Scheller, B

    2010-10-01

    Restenosis following interventions in the coronary or peripheral arteries develops over weeks to months. In coronary arteries the restenosis rate has been markedly reduced since the advent of drug-eluting stents. Non-stent-based methods for local drug delivery enable restenosis inhibition without the need for stent implantation, does not permanently change the structure of the vessel, are repeatable, and seems to be applicable where drug-eluting stents provide insufficient protection. Preclinical data indicate that short exposure of the vessel wall to a lipophilic inhibitor of cell proliferation is sufficient for preventing restenosis. Initial evidence to this effect emerged from an investigation of paclitaxel embedded in a matrix that enhances the solubility and release of the agent from the balloon coating as well as its transfer to the vessel wall. Further corroborating data from preclinical and clinical studies demonstrating a reduction in late lumen loss and lower restenosis rates led to the market introduction of a variety of paclitaxel-coated angioplasty balloons. The effectiveness of restenosis inhibition is not determined by the active agent alone. Other factors that are crucial for the effectiveness and safety of drug-coated angioplasty balloons are the formulation containing the agent and the coating technique. In this review we first outline the development of paclitaxel-coated balloons to then provide an overview of the preclinical results obtained with different paclitaxel-coated balloons and finally compare these with the outcome in patients. The article concludes with a short outlook on initial results with a zotarolimus-coated angioplasty balloon.

  11. Second-generation endometrial ablation technologies: the hot liquid balloons.

    Science.gov (United States)

    Vilos, George A; Edris, Fawaz

    2007-12-01

    Hysteroscopic endometrial ablation (HEA) was introduced in the 1980s to treat menorrhagia. Its use required additional training, surgical expertise and specialized equipment to minimize emergent complications such as uterine perforations, thermal injuries and excessive fluid absorption. To overcome these difficulties and concerns, thermal balloon endometrial ablation (TBEA) was introduced in the 1990s. Four hot liquid balloons have been introduced into clinical practice. All systems consist of a catheter (4-10mm diameter), a silicone balloon and a control unit. Liquids used to inflate the balloons include internally heated dextrose in water (ThermaChoice, 87 degrees C), and externally heated glycine (Cavaterm, 78 degrees C), saline (Menotreat, 85 degrees ) and glycerine (Thermablate, 173 degrees C). All balloons require pressurization from 160 to 240 mmHg for treatment cycles of 2 to 10 minutes. Prior to TBEA, preoperative endometrial thinning, including suction curettage, is optional. Several RCTs and cohort studies indicate that the advantages of TBEA include portability, ease of use and short learning curve. In addition, small diameter catheters requiring minimal cervical dilatation (5-7 mm) and short duration of treatment cycles (2-8 min) allow treatment under minimal analgesia/anesthesia requirements in a clinic setting. Following TBEA serious adverse events, including thermal injuries to viscera have been experienced. To minimize such injuries some surgeons advocate the use of routine post-dilatation hysteroscopy and/or ultrasonography to confirm correct intrauterine placement of the balloon prior to initiating the treatment cycle. After 10 years of clinical practice, TBEA is thought to be the preferred first-line surgical treatment of menorrhagia in appropriately selected candidates. Economic modeling also suggested that TBEA may be more cost-effective than HEA.

  12. Balloon-Borne Infrasound Detection of Energetic Bolide Events

    Science.gov (United States)

    Young, Eliot F.; Ballard, Courtney; Klein, Viliam; Bowman, Daniel; Boslough, Mark

    2016-10-01

    Infrasound is usually defined as sound waves below 20 Hz, the nominal limit of human hearing. Infrasound waves propagate over vast distances through the Earth's atmosphere: the CTBTO (Comprehensive Nuclear-Test-Ban Treaty Organization) has 48 installed infrasound-sensing stations around the world to detect nuclear detonations and other disturbances. In February 2013, several CTBTO infrasound stations detected infrasound signals from a large bolide that exploded over Chelyabinsk, Russia. Some stations recorded signals that had circumnavigated the Earth, over a day after the original event. The goal of this project is to improve upon the sensitivity of the CTBTO network by putting microphones on small, long-duration super-pressure balloons, with the overarching goal of studying the small end of the NEO population by using the Earth's atmosphere as a witness plate.A balloon-borne infrasound sensor is expected to have two advantages over ground-based stations: a lack of wind noise and a concentration of infrasound energy in the "stratospheric duct" between roughly 5 - 50 km altitude. To test these advantages, we have built a small balloon payload with five calibrated microphones. We plan to fly this payload on a NASA high-altitude balloon from Ft Sumner, NM in August 2016. We have arranged for three large explosions to take place in Socorro, NM while the balloon is aloft to assess the sensitivity of balloon-borne vs. ground-based infrasound sensors. We will report on the results from this test flight and the prospects for detecting/characterizing small bolides in the stratosphere.

  13. Voice prosthesis insertion after endoscopic balloon-catheter dilatation in case of a stenotic hypopharyngo-oesophageal junction.

    Science.gov (United States)

    Móricz, Péter; Gerlinger, Imre; Solt, Jeno; Somogyvári, Krisztina; Pytel, József

    2007-12-01

    Stenosis of the hypopharyngo-oesophageal junction can be a rare complication of laryngectomy and/or partial pharyngectomy and makes the insertion of voice prosthesis extremely difficult. This study describes the authors' experiences gained by endoscopic balloon-catheter dilatation of hypopharyngo-oesophageal stenoses prior to implantation of voice prostheses in four cases. In two patients a single balloon-catheter dilatation resulted in wide enough pharyngo-oesophageal lumen on the long run. The average prosthesis wearing-times were 6.8 months in case 1 and 4.6 months in case 2, corresponding to the published literature data. In case 3, repeated dilatation of the pharyngo-oesophageal transition had proved to be unsuccessful despite taking every effort with the endoscopic balloon-catheter method. Having excised the stenotic segment, reconstruction with pectoralis major myocutaneous flap (PMMF) was indicated. Eighteen months later, a repeated restenosis was observed and a free jejunal flap needed to be performed as a final solution. In case 4, the insertion was carried out into a previously dilated jejunal free flap, which became gradually ischemic and stenotic since the major head-and neck procedure was carried out that resulted in prosthesis rejection after just 1 week. The authors emphasize that correct indication of pedicled and free flaps in head and neck reconstruction is a prerequisite from the aspect of prevention of pharyngo-oesophageal strictures. Endoscopic balloon-catheter dilatation is a safe and established method for dilatating hypopharyngo-oesophageal stenoses of different origin. The procedure provides maximum patient benefit with minimal trauma and morbidity; moreover, facilitates insertion of voice prostheses. However, a single balloon-catheter dilatation cannot always result in wide enough oesophageal lumen on the long run (case 3). Insertion of a voice prosthesis into a previously dilated ischemic jejunal segment is challenging and avoidable due

  14. 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.

  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. 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

  17. Balloon-Borne System Would Aim Instrument Toward Sun

    Science.gov (United States)

    Polites, M. E.

    1992-01-01

    Proposed system including digital control computer, control sensors, and control actuators aims telescope or other balloon-borne instrument toward Sun. Pointing system and instrument flown on gondola, suspended from balloon. System includes reaction wheel, which applies azimuthal control torques to gondola, and torque motor to apply low-frequency azimuthal torques between gondola and cable. Three single-axis rate gyroscopes measure yaw, pitch, and roll. Inclinometer measures roll angle. Two-axis Sun sensor measures deviation, in yaw and pitch, of attitude of instrument from line to apparent center of Sun. System provides initial coarse pointing, then maintains fine pointing.

  18. Intrauterine tamponade balloon use in the treatment of uterine inversion.

    Science.gov (United States)

    Haeri, Sina; Rais, Sheliza; Monks, Brian

    2015-01-06

    Uterine inversion is a rare but life-threatening obstetrical emergency that occurs when the fundus of the uterus prolapses through the cervix, hence turning the uterus inside out. In this case report, we present our experience using an intrauterine tamponade balloon for management of uterine inversion, and a review of the literature. The utility of an intrauterine tamponade balloon in cases of uterine inversion, especially when maternal medical conditions preclude the use of uterotonics, or reinversion is observed should be kept in mind.

  19. 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

  20. Simultaneous electric-field measurements on nearby balloons.

    Science.gov (United States)

    Mozer, F. S.

    1972-01-01

    Electric-field payloads were flown simultaneously on two balloons from Great Whale River, Canada, on September 21, 1971, to provide data at two points in the upper atmosphere that differed in altitude by more than one atmospheric density scale height and in horizontal position by 30-140 km. The altitude dependences in the two sets of data prove conclusively that the vertical electric field at balloon altitudes stems from fair-weather atmospheric electricity sources and that the horizontal fields are mapped down ionospheric fields, since the weather-associated horizontal fields were smaller than 2 mV/m.

  1. 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.

  2. Large bowel impaction by the BioEnterics Intragastric Balloon (BIB) necessitating surgical intervention.

    Science.gov (United States)

    Kim, W Y; Kirkpatrick, U J; Moody, A P; Wake, P N

    2000-05-01

    A case of large bowel impaction caused by migration of a BioEnterics Intragastric Balloon (BIB) is presented. The literature is reviewed regarding both the use and the complications inherent in such balloon devices. This is the first reported case of an intragastric balloon impacted in the colon 9 months after insertion.

  3. Hybrid Global Communication Architecture with Balloons and Satellites

    Science.gov (United States)

    Pignolet, G.; Celeste, A.; Erb, B.

    2002-01-01

    Global space communication systems have been developed now for more than three decades, based mainly on geostationary satellites or almost equivalent systems such as the Molnya orbit concepts. The last decade of the twentieth century has seen the emergence of satellite constellations in low or medium Earth orbit, in order to improve accessibility in terms of visibility at higher latitudes and limited size or power requirement for ground equipment. However such systems are complex to operate, there are still many situations where connection may remain difficult to achieve, and commercial benefits are still to be proven. A new concept, using a network combination of geostationary relay satellites and high altitude stratospheric platforms may well overcome the inconveniences of both geostationary systems and satellite constellations to improve greatly global communication in the future. The emergence of enabling technologies developed in Japan and in several other countries will soon make it possible to fly helium balloons in the upper layers of the atmosphere, at altitudes of 20 km or more. At such an altitude, well above the meteorological disturbances and the jet-streams, the stratosphere enjoys a regular wind at moderate speeds ranging between 10 m/s and 30 m/s, depending on latitude and also on season. It is possible for balloons powered by electric engines to fly non- stop upstream of the wind in order to remain stationary above a particular location. Large balloons, with sizes up to 300 m in length, would be able to carry sub-satellite communication payloads, as well as observation apparatus and scientific equipment. The range of visibility for easy both-way communication between the balloon and operators or customers on the ground could be as large as 200 km in radius. Most current studies consider a combination of solar cells and storage batteries to power the balloons, but microwave beam wireless power transportation from the ground could be a very

  4. 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)

  5. 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)

  6. 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

  7. 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.

  8. Using Hydrogen Balloons to Display Metal Ion Spectra

    Science.gov (United States)

    Maynard, James H.

    2008-01-01

    We have optimized a procedure for igniting hydrogen-filled balloons containing metal salts to obtain the brightest possible flash while minimizing the quantity of airborne combustion products. We report air quality measurements in a lecture hall immediately after the demonstration. While we recommend that this demonstration be done outdoors or in…

  9. 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.

  10. 75 FR 77673 - National Environmental Policy Act: Scientific Balloon Program

    Science.gov (United States)

    2010-12-13

    ... SPACE ADMINISTRATION National Environmental Policy Act: Scientific Balloon Program AGENCY: National... the National Environmental Policy Act (NEPA) of 1969, as amended (42 U.S.C. 4321, et seq.); the Council on Environmental Quality Regulations for Implementing the Procedural Provisions of NEPA (40...

  11. Complications of flow-directed balloon-tipped catheters.

    Science.gov (United States)

    Smart, F W; Husserl, F E

    1990-01-01

    Acute or short-term complications following the use of flow-directed balloon-tipped catheters are well recognized. Long-term sequelae are rarely reported. We report herein an early complication of pulmonary arterial rupture with infarction followed by the delayed development of a pulmonary arterial aneurysm.

  12. An automatic parachute release for high altitude scientific balloons

    Science.gov (United States)

    Field, Chris

    NASA's Columbia Scientific Balloon Facility launches high altitude scientific research balloons at many locations around the world. Locations like Antarctica are flat for hundreds of miles and have nothing to snag a parachute consequently causing it to be more important to separate the parachute from the payload than in an area with vegetation and fences. Scientists are now building one of a kind payloads costing millions of dollars, taking five years or more to build, and are requesting multiple flights. In addition to that, the data gathering rate of many science payloads far exceeds the data downlink rate on over-the-horizon flights therefore making a recovery of at least the data hard drives a "minimum success requirement". The older mentality in ballooning; separating the parachute and payload from the balloon and getting it on the ground is more important than separating the parachute after the payload is on the ground has changed. It is now equally as important to separate the parachute from the gondola to prevent damage from dragging. Until now, commands had to be sent to separate the parachute from the gondola at approximately 60K ft, 30K ft, and 10K ft to use the Semi Automatic Parachute Release (SAPR), which is after the sometimes violent parachute opening shock. By using the Gondola controlled Automatic Parachute Release (GAPR) all commanding is done prior to termination, making the parachute release fully autonomous.

  13. The Micro-Instrumentation Package: A Solution to Lightweight Ballooning

    Science.gov (United States)

    Juneau, Jill

    This paper discusses the design and testing of an over the horizon (OTH) light weight telemetry and termination system that can be used for small ballooning payloads. Currently, the Columbia Scientific Balloon Facility (CSBF) provides telemetry for the science payload by integrating one of two types of support packages. The type of support package integrated depends on whether the flight will stay in range of line of sight (LOS) or will exceed LOS requiring the use of over the horizon (OTH) telemetry. The weights of these systems range from 100 pounds to 350 pounds depending upon the use of redundant systems, equipment for high data rates, and batteries and/or solar panels for power requirements. These weight values are not as significant for larger payloads but can be crippling for smaller payloads. In addition, these support package systems are fairly expensive, placing a high importance on recovery. A lightweight and inexpensive telemetry system could be beneficial for various reasons. First, it would allow scientists to fly lightweight payloads on large balloons reaching even higher altitudes. Second, scientists could fly lightweight payloads on less expensive balloons such as meteorological balloons. Depending on the payload, these flights could be fairly inexpensive and even disposable. Third, a compact telemetry system on any balloon will free up more room for the science portion of the payload. In response, a compact telemetry/termination system called the Micro-Instrumentation Package (MIP) was developed. The MIP provides uplink and downlink communications, an interface to the science, housekeeping information including global positioning system (GPS) position, and relays. Instead of a power-hungry microprocessor, the MIP's central consists of a microcontroller. Microcontrollers are lower power, easily programmed, and can be purchased for less than ten dollars. For uplink and downlink telemetry, the MIP uses an LOS serial transceiver and an Iridium unit

  14. Angioplasty with drug coated balloons for the treatment of infrainguinal peripheral artery disease.

    Science.gov (United States)

    Werner, Martin

    2016-09-01

    Restenosis or re-occlusion after femoropopliteal angioplasty or stent implantation is the main limitation of endovascular treatment strategies for peripheral artery disease. Within the last years, balloon catheters with anti-proliferative drug coating on the balloon surface have shown to be associated with higher patency rates compared to plain balloon angioplasty. Thus, drug-coated balloons were gradually adopted in many interventional centres for the treatment of femoropopliteal obstructions. The current review summarises the existing evidence for drug-coated balloons in the infrainguinal vessels and their indication in special lesion cohorts.

  15. [Perioperative management of abdominal aortic balloon occlusion in patients complicated with placenta percteta: a case report].

    Science.gov (United States)

    Zeng, Hong; Wang, Yan; Wang, Yang; Guo, Xiang-yang

    2015-12-18

    When placenta previa complicated with placenta percreta, the exposure of operative field is difficult and the routine methods are difficult to effectively control the bleeding, even causing life-threatening results. A 31-year-old woman, who had been diagnosed with a complete type of placenta previa and placenta percreta with bladder invasion at 34 weeks gestation. Her ultrasound results showed a complete type of placenta previa and there was a loss of the decidual interface between the placenta and the myometrium on the lower part of the uterus, suggestive of placenta increta. For further evaluation of the placenta, pelvis magnetic resonance imaging was performed, which revealed findings suspicious of a placenta percreta. She underwent elective cecarean section at 36 weeks of gestation. Firstly, two ureteral stents were placed into the bilateral ureter through the cystoscope. After the infrarenal abdominal aorta catheter was inserted via the femoral artery (9 F sheath ), subarachnoid anesthesia had been established. A healthy 2 510 g infant was delivered, with Apgar scores of 10 at 1 min and 10 at 5 min. Immediately after the baby was delivered, following which there was massive haemorrhage and general anaesthesia was induced. The balloon catheter was immediately inflated until the wave of dorsal artery disappeared. With the placenta retained within the uterus, a total hysterectomy was performed. The occluding time was 30 min. The intraoperative blood loss was 2 500 mL. The occluding balloon was deflated at the end of the operation. The patient had stable vital signs and normal laboratory findings during the recovery period and the hemoglobin was 116 g/L. She was discharged six days after delivery without intervention-related complications. This case illustrates that temporary occlusion of the infrarenal abdominal aorta using balloon might be a safe and effective treatment option for patients with placenta previa complicated with placenta percreta, who were at high

  16. 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

  17. High Altitude Infrasound Measurements using Balloon-Borne Arrays

    Science.gov (United States)

    Bowman, D. C.; Johnson, C. S.; Gupta, R. A.; Anderson, J.; Lees, J. M.; Drob, D. P.; Phillips, D.

    2015-12-01

    For the last fifty years, almost all infrasound sensors have been located on the Earth's surface. A few experiments consisting of microphones on poles and tethered aerostats comprise the remainder. Such surface and near-surface arrays likely do not capture the full diversity of acoustic signals in the atmosphere. Here, we describe results from a balloon mounted infrasound array that reached altitudes of up to 38 km (the middle stratosphere). The balloon drifted at the ambient wind speed, resulting in a near total reduction in wind noise. Signals consistent with tropospheric turbulence were detected. A spectral peak in the ocean microbarom range (0.12 - 0.35 Hz) was present on balloon-mounted sensors but not on static infrasound stations near the flight path. A strong 18 Hz signal, possibly related to building ventilation systems, was observed in the stratosphere. A wide variety of other narrow band acoustic signals of uncertain provenance were present throughout the flight, but were absent in simultaneous recordings from nearby ground stations. Similar phenomena were present in spectrograms from the last balloon infrasound campaign in the 1960s. Our results suggest that the infrasonic wave field in the stratosphere is very different from that which is readily detectable on surface stations. This has implications for modeling acoustic energy transfer between the lower and upper atmosphere as well as the detection of novel acoustic signals that never reach the ground. Our work provides valuable constraints on a proposed mission to detect earthquakes on Venus using balloon-borne infrasound sensors.

  18. 椎体成形术或后凸成形术生物活性充填材料的体内降解%The degradation of bioactive bone cement for vertebroplasty or kyphoplasty in vivo

    Institute of Scientific and Technical Information of China (English)

    朱雪松; 陈晓庆; 陈春茂; 王根林; 顾勇; 耿德春; 张志明; 杨惠林

    2010-01-01

    目的 观察磷酸钙骨水泥(CPC)和硫酸钙骨水泥(CSC)在椎体内的演变过程,为椎体成形术或后凸成形术中寻找更为合适的充填材料.方法 对24只成年雌性绵羊的L2~L5椎体制作骨缺损,随机注入CPC、CSC和聚甲基丙烯酸甲酯(PMMA),其中剩余的椎体作为空白对照,并以L6椎体作正常对照.术后2周、12周和24周分别随机处死其中8只绵羊,进行大体观察、生物力学测试、不脱钙组织学分析.结果 CSC组和CPC组椎体被填充材料明显增强,但CSC组椎体力学性能自2~12周呈现下降趋势,而到24周时又出现回升.CPC组椎体力学性能自2~24周呈上升趋势.12周时3组新骨形成量差异不明显,CSC已被大部分吸收;植入24周时新骨形成量CSC组>空白组>CPC组,CPC出现了明显的吸收,而CSC仅有少量残留.结论 CSC与CPC初期均能明显增强椎体;随着时间的推移,CSC在体内降解迅速,而CPC在体内降解缓慢.%Objective To observe the degradation of calcium phosphate cements (CPC) and calcium sulfate cement (CSC) in vertebras, and explore the ideal filler for vertebroplasty and kyphoplasty.Methods Bone voids were created in L2-L5 vertebras of 24 female mature sheep. CPC, CSC and polymethylmethacrylate (PMMA) were injected into one bone void randomly, and the remaining voids served as the blank control, and L6 vertebra served as the normal control. Eight sheep were sacrificed at the 2nd,12th and 24th week after operation randomly. Gross observation, biomechanical test and undecalcified bone histology analyses were performed. Results Biomechanical analysis showed that the vertebras could be augmented by CPC and CSC. The mechanical properties of CSC group were decreased from the 2nd to 12th week, and increased from the 12th to 24th week after operation. The mechanical properties of CPC group were increased from the 2nd to 24th week, however, but lower than PMMA group. Histology analysis revealed CSC was mostly

  19. Concept report: Experimental vector magnetograph (EXVM) operational configuration balloon flight assembly

    Science.gov (United States)

    1993-01-01

    The observational limitations of earth bound solar studies has prompted a great deal of interest in recent months in being able to gain new scientific perspectives through, what should prove to be, relatively low cost flight of the magnetograph system. The ground work done by TBE for the solar balloon missions (originally planned for SOUP and GRID) as well as the rather advanced state of assembly of the EXVM has allowed the quick formulation of a mission concept for the 30 cm system currently being assembled. The flight system operational configuration will be discussed as it is proposed for short duration flight (on the order of one day) over the continental United States. Balloon hardware design requirements used in formulation of the concept are those set by the National Science Balloon Facility (NSBF), the support agency under NASA contract for flight services. The concept assumes that the flight hardware assembly would come together from three development sources: the scientific investigator package, the integration contractor package, and the NSBF support system. The majority of these three separate packages can be independently developed; however, the computer control interfaces and telemetry links would require extensive preplanning and coordination. A special section of this study deals with definition of a dedicated telemetry link to be provided by the integration contractor for video image data for pointing system performance verification. In this study the approach has been to capitalize to the maximum extent possible on existing hardware and system design. This is the most prudent step that can be taken to reduce eventual program cost for long duration flights. By fielding the existing EXVM as quickly as possible, experience could be gained from several short duration flight tests before it became necessary to commit to major upgrades for long duration flights of this system or of the larger 60 cm version being considered for eventual development.

  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

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Jae Soo; You, Jin Jong [Gyeongsang National University Hospital, Chinju (Korea, Republic of)

    2005-07-15

    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. Challenges of the opto-mechanical conceptual design of a small far-IR balloon experiment

    Science.gov (United States)

    Dournaux, Jean-Laurent; Berthod, Christophe; Horville, David; Huet, Jean-Michel; Laporte, Philippe; Wiedner, Martina; Romanow, Alexia; Krieg, Jean-Michel; Pagani, Laurent; Evrard, Jean; Gomes, Albert; Jouret, Martine

    2014-07-01

    Astronomers require more and more precise instruments for their observations. Here we describe the challenges encountered in the optical and mechanical designs of the CIDRE (Campagne d'Identification du Deutérium par Réception hEtérodyne) project, which was to be flown on a high altitude balloon at 40 km. The project aimed to measure the transitions of the HD molecule at 2.675 THz band and some other THz lines in our galaxy. The astronomers asked to fly the biggest possible telescope in a standard balloon gondola, and required high pointing accuracy (7 arcsec). In January 2014, the technical project, including the optical and mechanical designs, was evaluated to be of excellent standard, but, for all that, the project was cancelled because of financial constraints. Nevertheless the phase A study allowed us to identify the optical and mechanical challenges of balloon projects and we were able to come up with a simple design, that fulfilled all the requirements. The 900 mm primary mirror and the rest of the optics were designed to be supported by a sandwich-panel composite structure with carbon epoxy skins and aluminum honeycomb core to improve the mechanical stiffness and the thermal behavior of the instrument without increasing its mass or its complexity. In this paper, we describe the optical design and the mechanical structure of the instrument. Finite element analysis is carried out to estimate the gravitational flexure and the thermal deformations, which can both harm the pointing accuracy and the performances of the instrument. These simulations show that the proposed design would fulfill the different requirements (pointing accuracy, landing survival as well as the dynamic behavior).

  3. 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.

  4. A comparison of balloon-expandable-stent implantation with balloon angioplasty in patients with coronary artery disease

    NARCIS (Netherlands)

    P.W.J.C. Serruys (Patrick); P.P.T. de Jaegere (Peter); F. Kiemeneij (Ferdinand); C.M. Miguel (Carlos); W.R. Rutsch (Wolfgang); G.R. Heyndrickx (Guy); H.U. Emanuelsson (Hakan); J. Marco (Jean); V.M.G. Legrand (Victor); P.H. Materne (Phillipe); J.A. Belardi (Jorge); U. Sigwart (Ulrich); A. Colombo (Antonio); J-J. Goy (Jean-Jacques); P.A. van den Heuvel (Paul); J. Delcan; M-A.M. Morel (Marie-Angèle)

    1994-01-01

    textabstractBalloon-expandable coronary-artery stents were developed to prevent coronary restenosis after coronary angioplasty. These devices hold coronary vessels open at sites that have been dilated. However, it is unknown whether stenting improves long-term angiographic and clinical outcomes as c

  5. A comparison of balloon-expandable-stent implantation with balloon angioplasty in patients with coronary artery disease.

    NARCIS (Netherlands)

    P.W.J.C. Serruys (Patrick); P.P.T. de Jaegere (Peter); F. Kiemeneij (Ferdinand); C.M. Miguel (Carlos); W.R. Rutsch (Wolfgang); G.R. Heyndrickx (Guy); H.U. Emanuelsson (Hakan); J. Marco (Jean); V.M.G. Legrand (Victor); P.H. Materne (Phillipe); J.A. Belardi (Jorge); U. Sigwart (Ulrich); A. Colombo (Antonio); J-J. Goy (Jean-Jacques); P. van den Heuvel; J. Delcan; M-A.M. Morel (Marie-Angèle)

    1994-01-01

    textabstractBACKGROUND. Balloon-expandable coronary-artery stents were developed to prevent coronary restenosis after coronary angioplasty. These devices hold coronary vessels open at sites that have been dilated. However, it is unknown whether stenting improves long-term angiographic and clinical o

  6. Sicily 2002 balloon campaign: a test of the HASI instrument

    Science.gov (United States)

    Bettanini, C.; Fulchignoni, M.; Angrilli, F.; Lion Stoppato, P. F.; Antonello, M.; Bastianello, S.; Bianchini, G.; Colombatti, G.; Ferri, F.; Flamini, E.; Gaborit, V.; Aboudan, A.

    2004-01-01

    A mock-up of the probe descending in the Titan atmosphere as part of the Huygens Cassini Mission was successfully launched and recovered on 30th May 2002 after a stratospheric balloon launch from the Italian Space Agency Base "Luigi Broglio" in Trapani, Sicily. To simulate the Huygens mission at Titan, the probe was lifted to an altitude of 32 km and then released to perform a 45 min parachute decelerated descent. The probe was hosting spares of HASI instruments, housekeeping sensors and other dedicated sensors, Beagle II UV Sensors and Huygens Tilt Sensor, for a total of 76 acquired sensor channels and sampled during the ascent, drift and descent phase. An integrated data acquisition and instrument control system was developed, based on PC architecture and soft-real-time application. Sensors channels were sampled at the nominal HASI data rates, with a max rate of 1 kHz. Software was developed for data acquisition, onboard storage and telemetry transmission satisfying all requests for real-time monitoring, diagnostic and redundancy. The main goal of this flight was to verify sensor performance and perform a realistic functional test for HASI hardware in dynamical and environmental conditions similar to those of the Titan atmosphere as well as the impact detection sequence of HASI accelerometer and HASI during ground landing. Aerodynamic study of the probe has contributed in achieving descent velocity and spin rate profiles close to the ones envisioned for the Huygens Titan descent. Profiles have been calculated by solving a system of ODE describing the translational and rotational motion of the probe through the Earth's atmosphere during parachute aided descent. Results of these calculations have driven the choice of an appropriate angle of attack of the blades in the bottom of the probe and ballast weight during flight. Passive thermal control of the probe has also been designed and implemented in order to guarantee proper temperature ranges on critical components

  7. Thermal, Structural, and Optical Analysis of a Balloon-Based Imaging System

    Science.gov (United States)

    Borden, Michael; Lewis, Derek; Ochoa, Hared; Jones-Wilson, Laura; Susca, Sara; Porter, Michael; Massey, Richard; Clark, Paul; Netterfield, Barth

    2017-03-01

    The Subarcsecond Telescope And BaLloon Experiment, STABLE, is the fine stage of a guidance system for a high-altitude ballooning platform designed to demonstrate subarcsecond pointing stability over one minute using relatively dim guide stars in the visible spectrum. The STABLE system uses an attitude rate sensor and the motion of the guide star on a detector to control a Fast Steering Mirror to stabilize the image. The characteristics of the thermal-optical-mechanical elements in the system directly affect the quality of the point-spread function of the guide star on the detector, so a series of thermal, structural, and optical models were built to simulate system performance and ultimately inform the final pointing stability predictions. This paper describes the modeling techniques employed in each of these subsystems. The results from those models are discussed in detail, highlighting the development of the worst-case cold and hot cases, the optical metrics generated from the finite element model, and the expected STABLE residual wavefront error and decenter. Finally, the paper concludes with the predicted sensitivities in the STABLE system, which show that thermal deadbanding, structural pre-loading, and self-deflection under different loading conditions, and the speed of individual optical elements were particularly important to the resulting STABLE optical performance.

  8. 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.

  9. The TRACER instrument: A balloon-borne cosmic-ray detector

    Science.gov (United States)

    Ave, M.; Boyle, P. J.; Brannon, E.; Gahbauer, F.; Hermann, G.; Höppner, C.; Hörandel, J. R.; Ichimura, M.; Müller, D.; Obermeier, A.; Romero-Wolf, A.

    2011-10-01

    We describe a large-area detector for measurements of the intensity of cosmic-ray nuclei in balloon-borne exposures. In order to observe individual nuclei at very high energies, the instrument employs transition radiation detectors (TRD) whose energy response extends well beyond 10 4 GeV amu -1. The TR measurement is performed with arrays of single-wire proportional tubes interleaved with plastic-fiber radiators. An additional energy determination comes from the specific ionization in gas and its relativistic rise which is also measured with proportional tubes. The tubes also determine the trajectory of each cosmic-ray nucleus with mm-resolution. In total, nearly 1600 tubes are used. The instrument is triggered by large-area plastic scintillators. The scintillators, together with acrylic Cherenkov counters, also determine the nuclear charge Z of each cosmic-ray particle, measure the energy in the GeV amu -1 region, and discriminate against low-energy background. We describe the details of this detector system, and discuss its performance in three high-altitude balloon flights, including two long-duration flights in 2003 and 2006 at Antarctic and Arctic latitudes, respectively. Scientific results from these flights are summarized, and possible future developments are reviewed.

  10. A systematic review and meta-analysis of intra-aortic balloon pump therapy in ST-elevation myocardial infarction: should we change the guidelines?

    NARCIS (Netherlands)

    K.D. Sjauw; A.E. Engström; M.M. Vis; R.J. van der Schaaf; J.,Jr Baan; K.T. Koch; R.J. de Winter; J.J. Piek; J.G.P. Tijssen; J.P.S. Henriques

    2009-01-01

    Aims Intra-aortic balloon counterpulsation (IABP) in ST-segment elevation myocardial infarction (STEMI) with cardiogenic shock is strongly recommended (class IB) in the current guidelines. We performed meta-analyses to evaluate the evidence for IABP in STEMI with and without cardiogenic shock. Metho

  11. 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.

  12. 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.

  13. Use of a Fourier transform spectrometer on a balloon-borne telescope and at the multiple mirror telescope (MMT)

    Science.gov (United States)

    Traub, W. A.; Chance, K. V.; Brasunas, J. C.; Vrtilek, J. M.; Carleton, N. P.

    1982-01-01

    The design and use of an infrared Fourier transform spectrometer which has been used for observations of laboratory, stratospheric, and astronomical spectra are described. The spectrometer has a spectral resolution of 0.032/cm and has operated in the mid-infrared (12 to 13 microns) as well as the far-infrared (40 to 140 microns), using both bolometer and photoconductor cryogenic detectors. The spectrometer is optically sized to accept an f/9 beam from the multi-mirror telescope (MMT). The optical and electronic design are discussed, including remote operation of the spectrometer on a balloon-borne 102-cm telescope. The performance of the laser-controlled, screw-driven moving cat's-eye mirror is discussed. Segments of typical far-infrared balloon flight spectra, lab spectra, and mid-infrared MMT spectra are presented. Data reduction, interferogram processing, artifact removal, wavelength calibration, and intensity calibration methods are discussed. Future use of the spectrometer is outlined.

  14. Using High Resolution Balloon Photography to Provide Topographic Data

    Science.gov (United States)

    Russell, K.; Bauer, T.

    2009-12-01

    For site-scale projects, the Bureau of Reclamation has used low altitude balloon photogrammetry to obtain high-resolution photographs and detailed topographic information. These data are collected in a fraction of the time and effort it would take to obtain a similar level of detail using traditional methods. This is accomplished at a significantly reduced cost compared to flying LiDAR or aerial photography, which can be prohibitively expensive for small or medium scale projects. Low altitude balloon photogrammetry is a process where overlapping photographs and ground survey control points are input into a photogrammetry software program (AdamTechnology 3DM Analyst Mine Mapping Suite) to produce orthophotographs and digital terrain model (DTM) elevation points. To acquire the photos a digital camera is attached to an 8-foot diameter helium balloon. The balloon is tethered and flown above the location of interest. The camera is controlled remotely while a live image is transmitted to a receiver on the ground. Ground survey control is established by using GPS equipment to survey ground targets placed within the area to be photographed. There are limitations to the process. Data collection is very weather dependent; too much wind causes the balloon to be unstable. Site conditions also determine the feasibility: power lines, trees, and steep embankments can cause difficulties maneuvering the balloon. Although some of the photographs show the underwater portion of the channel; there is little agreement between GPS points and the processed DTM elevations in the channel. The balloon has been used to survey large woody debris (LWD) structures and channel morphology in the Middle Fork John Day River (central Oregon) and monitoring debris after the removal of Chiloquin Dam (Sprague River, southern Oregon). Seventeen LWD structures were installed on the Middle Fork John Day River near John Day, OR in 2007 and 2008 to provide aquatic habitat. Balloon photos were obtained in

  15. 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.

  16. 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

    Today it is widely recognised that a measurement of the polarization status of cosmic sources high energy emission is a key observational parameter to understand the active production mechanism and its geometry. Therefore new instrumentation operating in the hard X/soft γ rays energy range should...... 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...... development results and possible improvements currently under study. Furthermore we describe a possible baseline design of the payload, which can be also seen as a pathfinder for a high performance focal plane detector in new hard X and soft gamma ray focussing telescopes and/or advanced Compton instruments...

  17. 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.

  18. Fine-scale turbulence soundings in the stratosphere with the new balloon-borne instrument LITOS

    Directory of Open Access Journals (Sweden)

    A. Theuerkauf

    2010-08-01

    Full Text Available We have developed a new compact balloon payload called LITOS (Leibniz-Institute Turbulence Observations in the Stratosphere for high resolution wind turbulence soundings up to 35 km altitude. The wind measurements are performed applying a constant temperature anemometer (CTA with a vertical resolution of ~2.5 mm, i.e. 2 kHz sampling rate at 5 m/s ascent speed. Thereby, for the first time, it is possible to study the entire turbulence spectrum down to the viscous subrange in the stratosphere. Including telemetry, housekeeping, batteries and recovery unit the payload weighs less than 5 kg and can be launched at any radiosonde station. Since autumn 2007 LITOS has been successfully launched several times from the Leibniz-Institute of Atmospheric Physics (IAP in Kühlungsborn, Germany (54° N, 12° E. Two additional soundings were carried out in 2008 and 2009 at Kiruna, Sweden (67° N, 21° E as part of the BEXUS program (Balloon-borne EXperiments for University Students. We describe here the basic principle of CTA measurements and prove the validity of this method in the stratosphere. First case studies allow a clear distinction between non-turbulent layers and turbulent layers with a thickness of some tens of meters. Since our measurements cover the transition between the inertial and viscous subrange, energy dissipation rates can be calculated with high reliability.

  19. Comparison of a nitinol stent versus balloon angioplasty for treatment of a dysfunctional arteriovenous graft

    Energy Technology Data Exchange (ETDEWEB)

    Yoon, Yeo Chang; Shin, Byung Seok; Ahn, Moon Sang [Chungnam National University Hospital, Daejeon (Korea, Republic of); Park, Mi Hyun [Dankook Univ. Hospital, Cheonan (Korea, Republic of); Ohm, Joon Young [The Catholic Univ. of Korea College of Medicine/Bucheon St. Mary' s Hospital, Bucheon (Korea, Republic of); Kim, Ho Jun [Konyang Univ. Hospital, Daejeon (Korea, Republic of)

    2012-06-15

    This study aimed to 1) evaluate the outcome of placing a nitinol stent for treating dysfunctional arteriovenous grafts (AVG), and 2) compare the results with those of successful balloon angioplasty. Between February 2008 and October 2011, we retrospectively reviewed the interventional data and medical records of 29 patients (21 men, 8 women; mean age, 67.4 years) who underwent interventional procedures for dysfunctional AVG. Stents were placed only in cases with inadequate angioplasty results. Stent patency was evaluated and compared to cases of successful balloon angioplasty using the Kaplan Meier analysis. Eleven stents and 18 angioplasties were performed successfully at the venous anastomotic site of AVG. The primary patency at 3, 6, 12, and 18 months did not differ significantly for stent placement and angioplasty (52%, 29%, 15%, 15% vs. 71%, 50%, 34%, 34%; mean survival, 164 vs. 253 days, p = 0.283). Secondary patency of the stent also did not differ significantly from angioplasty (80%, 80%, 49%, 49% vs. 76%, 57%, 57%, 36%; mean survival, 405 vs. 385 days, p = 0.553). Nitinol stent placement was effective for treating dysfunctional AVG, but did not improve the primary and secondary patency compared to successful angioplasty.

  20. Preparation and characterisation of polyamide 11/montmorillonite (MMT) nanocomposites for use in angioplasty balloon applications

    Energy Technology Data Exchange (ETDEWEB)

    Halim, Khairul Anwar A. [Department of Polymer Engineering, Athlone Institute of Technology, Athlone (Ireland); School of Materials Engineering, Universiti Malaysia Perlis, Perlis (Malaysia); Farrell, Joseph B. [Department of Polymer Engineering, Athlone Institute of Technology, Athlone (Ireland); Kennedy, James E., E-mail: jkennedy@ait.ie [Department of Polymer Engineering, Athlone Institute of Technology, Athlone (Ireland)

    2013-12-16

    With increased demands on catheter balloon functionality, there is an emphasis to blend new materials which can improve mechanical performance. Polymer nanocomposites were prepared by melt blending polyamide 11 (PA 11) with organically modified montmorillonite nanoclay. The effects of incorporating the nanoclay on the short-term mechanical properties of PA 11 were assessed using a design of experiments (DoEs) approach. X-ray diffraction (XRD), transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis techniques (DMA) were used to characterise the morphology of the nanocomposites. Design of experiments studies revealed that the optimum nanocomposites properties can be achieved by carefully controlling the melt compounding parameters. XRD and TEM data proved that exfoliated clay morphologies existed within the matrix at low clay loading (2%). Whereas the interaction between the polymer matrix and nanoclay was quantified in the DMA spectra, showed a significant increase in storage modulus (up to 80%). The reinforcing effect of nanoclay within the PA 11 was further investigated using mechanical testing, where significant increases in the ultimate tensile strength and strain at break of reinforced tri-layer balloon tubing were observed. - Highlights: • TEM reveals the coexistence of exfoliated and intercalated nanostructures. • Isothermal crystallisation studies found that the nano-clays reduced the crystallisation time. • Significant increase in the storage modulus was due to the reinforcing effect of the nano-clay platelets. • It was observed that the activation energy values decreased due to the presence of nanoclay.

  1. 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.

  2. 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.

  3. Space-quality data from balloon-borne telescopes: the High Altitude Lensing Observatory (HALO)

    CERN Document Server

    Rhodes, Jason; Booth, Jeffrey; Massey, Richard; Liewer, Kurt; Smith, Roger; Amara, Adam; Aldrich, Jack; Berge, Joel; Bezawada, Naidu; Brugarolas, Paul; Clark, Paul; Dubbeldam, Cornelis M; Ellis, Richard; Frenk, Carlos; Gallie, Angus; Heavens, Alan; Henry, David; Jullo, Eric; Kitching, Thomas; Lanzi, James; Lilly, Simon; Lunney, David; Miyazaki, Satoshi; Morris, David; Paine, Christopher; Peacock, John; Pellegrino, Sergio; Pittock, Roger; Pool, Peter; Refregier, Alexandre; Seiffert, Michael; Sharples, Ray; Smith, Alexandra; Stuchlik, David; Taylor, Andy; Teplitz, Harry; Vanderveld, R Ali; Wu, James

    2012-01-01

    We present a method for attaining sub-arcsecond pointing stability during sub- orbital balloon flights, as designed for in the High Altitude Lensing Observatory (HALO) concept. The pointing method presented here has the potential to perform near-space quality optical astronomical imaging at 1-2% of the cost of space-based missions. We also discuss an architecture that can achieve sufficient thermomechanical stability to match the pointing stability. This concept is motivated by advances in the development and testing of Ultra Long Duration Balloon (ULDB) flights which promise to allow observation campaigns lasting more than three months. The design incorporates a multi-stage pointing architecture comprising: a gondola coarse azimuth control system, a multi-axis nested gimbal frame structure with arcsecond stability, a telescope de-rotator to eliminate field rotation, and a fine guidance stage consisting of both a telescope mounted angular rate sensor and guide CCDs in the focal plane to drive a fast-steering ...

  4. 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.

  5. Predictors of Developing Significant Mitral Regurgitation Following Percutaneous Mitral Commissurotomy with Inoue Balloon Technique

    Directory of Open Access Journals (Sweden)

    Abdelfatah A. Elasfar

    2011-01-01

    Full Text Available Background. Despite the high technical expertise in percutaneous mitral commissurotomy (PMC, mitral regurgitation (MR remains a major procedure-related complication. The aim of this work is to find out the most sensitive and applicable predictors of development of significant mitral regurgitation (SMR following percutaneous mitral commissurotomy using Inoue balloon technique. Methods. We studied prospectively the preprocedural (clinical, echocardiography, and hemodynamic and procedural predictors of significant mitral regurgitation (identified as increase of ≥2/4 grades of pre-PMC MR by color Doppler flow mapping following valvuloplasty using Inoue balloon in 108 consecutive patients with severe mitral stenosis. Multiple stepwise logistic regression analysis was performed for variables found positive on univariate analysis to determine the most important predictor(s of developing SMR. Results. The incidence of SMR following PMC using Inoue technique was 18.5% (10 patients. MV scoring systems were the only variables that showed significant differences between both groups (Group A without SMR and Group B with SMR. However, no clinical, other echocardiographic measurements, hemodynamic or procedural variables could predict the development of SMR. Using multiple regression analysis, the best predictive factor for the risk of SMR after Inoue BMV was the total MR-echo score with a cutoff point of 7 and a predictive percentage of 97.7%. Conclusions. The total MR-echo score is the only independent predictor of SMR following PMC using Inoue technique with a cutoff point of 7.

  6. Balloon Flight Test of a Compton Telescope Based on Scintillators with Silicon Photomultiplier Readouts

    CERN Document Server

    Bloser, P F; 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. 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 the rejection of background via time-of-flight (ToF) discrimination. The Solar Compton Telescope (SolCompT) prototype 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 dete...

  7. Surgical interventions in patients undergoing percutaneous balloon mitral valvotomy : a retrospective analysis of anaesthetic considerations.

    Directory of Open Access Journals (Sweden)

    Tempe Deepak

    2004-01-01

    Full Text Available Between 1990 and 2000, 5499 balloon mitral valvotomies were performed at GB Pant Hospital. Amongst these, 45 patients required surgical intervention, which form the basis of this report. There were 18 males and 27 females with the mean age of 26.5+/-8.3 years and weight of 42.9+/-7.39 kg. Thirty-five patients underwent open-heart surgery and 10 closed-heart surgery. Twenty-five patients developed acute severe mitral regurgitation during balloon mitral valvotomy and required emergency open-heart surgery. Morphine based anaesthetic technique with careful attention to haemodynamic monitoring was used in these patients. All patients required a high inotropic support to terminate the cardiopulmonary bypass. The closed-heart surgical procedures included emergency exploration for cardiac tamponade (4, exploration + closed mitral valvotomy (4, and elective closed mitral valvotomy (2. The overall mortality was 9%, which is much higher than the reported mortality for elective mitral valve replacement. Morphine based anaesthetic technique is useful in these patients. Adequate oxygenation, vasodilators, inotropes and diuretics are required for preoperative stabilisation of patients who develop acute mitral regurgitation, while those who develop cardiac tamponade need volume replacement along with inotropes and immediate surgical decompression of the tamponade.

  8. Apical ballooning-like syndrome: Hypocalcemia? What else!

    Directory of Open Access Journals (Sweden)

    Maria Accadia

    2016-01-01

    Full Text Available Apical ballooning syndrome (ABS, also known as Takotsubo or stress cardiomyopathy, is characterised by acute, transient and severe LV dysfunction, mimicking myocardial infarction; it occurs, in most cases, in the absence of obstructive coronary disease and is precipitated by severe emotional or physical stress, but many other potential triggers has been identi ed in the last years. Although the pathogenesis of ABS remains unclear, the most common mechanisms suggested are coronary vasospam and an exaggerated sympathetic activation associated to high levels of plasma cathecolamine leading to cardiotoxicity.We describe two cases of Apical Ballooning like Syndrome that were triggered by severe, acute hypocalcemia, without evidence of coronary vasospasm and with normal hematic level of cathecolamines.

  9. Developing International Standards for Meteorological Balloon to Facilitate Industrial Progress

    Institute of Scientific and Technical Information of China (English)

    Deng Yizhi

    2011-01-01

    Meteorological balloon is made of natural rubber latex with a special process.On natural conditions,it carries the air sounding instrument into the high air to detect the meteorological elements in the air.As a means of delivery used in the aerological sounding,it is widely used in the meteorological,sailing,aeronautical,aerospace and other fields,and plays an extremely important role in the weather report,disaster prevention,disaster relief,guaranteeing ships and aircrafts to leave ports safely,and scientific research in relevant spaces,etc.Especially,the role of meteorological balloons is not ignorable in the forecast of extremely adverse weather frequently occurring around the world in recent years.

  10. MIPAS Ozone Validation by Stratospheric Balloon and Aircraft Measurements

    Science.gov (United States)

    Cortesi, U.; Blom, C. E.; Camy-Peyret, C.; Chance, K.; Davies, J.; Goutail, F.; Kuttippurath, J.; McElroy, C. T.; Mencaraglia, F.; Oelhaf, H.; Petritoli, A.; Pirre, M.; Pommereau, J. P.; Ravegnani, F.; Renard, J. B.; Strong, K.

    2004-08-01

    A number of in situ and remote sensing techniques for the measurement of upper tropospheric and stratospheric O3 content was employed during dedicated experiments of the ESABC programme, aiming at the validation of the ENVISAT chemistry payload. In this paper, we will be focusing on the validation of MIPAS off-line products, by presenting the results of the intercomparison between MIPAS O3 vertical profiles and aircraft and balloon correlative measurements. First priority is given to the validation of processor v4.61 data, but individual results of 2002 and 2003 balloon observations are also compared with MIPAS O3 non operational data. Some general remarks are finally expressed, along with specific recommendation to fully exploit the available ESABC validation dataset

  11. Apical ballooning-like syndrome: Hypocalcemia? What else!

    OpenAIRE

    Maria Accadia; Marianna Abitabile; Salvatore Rumolo; Scotto di Uccio Fortunato; Luigi Irace; Andrea Tuccillo; Giuseppe Mercogliano; Bernardino Tuccillo

    2016-01-01

    Apical ballooning syndrome (ABS), also known as Takotsubo or stress cardiomyopathy, is characterised by acute, transient and severe LV dysfunction, mimicking myocardial infarction; it occurs, in most cases, in the absence of obstructive coronary disease and is precipitated by severe emotional or physical stress, but many other potential triggers has been identi ed in the last years. Although the pathogenesis of ABS remains unclear, the most common mechanisms suggested are coronary vasospam an...

  12. The Extreme Universe Space Observatory Super Pressure Balloon Mission

    Science.gov (United States)

    Wiencke, Lawrence; Olinto, Angela; Adams, Jim; JEM-EUSO Collaboration

    2017-01-01

    The Extreme Universe Space Observatory on a super pressure balloon (EUSO-SPB) mission will make the first fluorescence observations of high energy cosmic ray extensive air showers by looking down on the atmosphere from near space. A long duration flight of at least 50 nights launched from Wanaka NZ is planned for 2017. We describe completed instrument, and the planned mission. We acknowledge the support of NASA through grants NNX13AH53G and NNX13AH55G.

  13. Astronomical observations with the University College London balloon borne telescope

    Science.gov (United States)

    Jennings, R. E.

    1974-01-01

    The characteristics of a telescope system which was developed for high altitude balloon astronomy are discussed. A drawing of the optical system of the telescope is provided. A sample of the signals recorded during one of the flights is included. The correlation between the infrared flux and the radio continuum flux is analyzed. A far infrared map of the radio and infrared peaks of selected stars is developed. The spectrum of the planet Saturn is plotted to show intensity as compared with wavenumber.

  14. Double-balloon enteroscopy in detecting small intestinal bleeding

    Institute of Scientific and Technical Information of China (English)

    ZHI Fa-chao; PAN De-shou; ZHOU Dian-yuan; XIAO Bing; JIANG Bo; WAN Tian-mo; GUO Yu; ZHOU Dan; WANG Li-hui; CHEN Jin-feng; XIE Lu

    2005-01-01

    @@ Digestive tract hemorrhage is a common disease of the digestive system, but about 0.4%-5% intestinal bleeding can not be detected with gastroscope or colonscope.1 Since the intestine is long, tortuous, far away from both ends of the digestive tract and unfixed in position, clinical diagnosis of the bleeding is relatively difficult. Yamamoto and Sugano2 reported the clinical application of double-balloon enteroscope at American DDW in 2003.

  15. 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.

  16. NEW APPROACHES: A hot air balloon from dustbin liners

    Science.gov (United States)

    Weaver, Nicholas

    1998-07-01

    This article describes how a simple hot air balloon, inflated by a hair dryer, can be made out of household bin liners and Sellotape. It can be used at sixth-form level as an application of the ideal gas equation, = constant, and is rather more exciting than heated pistons. It gives a taste of a simple engineering design process, although the students do have to be reasonably adept at geometry and algebra.

  17. 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.

  18. 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.

  19. 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.

  20. Low Cost Balloon programme of Indian Centre for Space Physics

    Science.gov (United States)

    Chakrabarti, Sandip Kumar

    2016-07-01

    Indian Centre for Space Physics has launched 89 Missions to near space using single or multiple weather balloons or very light plastic balloons. Basic goal was to capitalize miniaturization of equipments in modern ages. Our typical payload of less than 4kg weight consists of GPS, video camera, cosmic ray detectors, Attitude measurement unit, sunsensor and most importantly a 50-100sqcm X-ray/Gamma-ray detector (usually a scintillator type). The main purpose of the latter is to study spectra of secondary cosmic ray spectra (till our ceiling altitude of 36-42km) over the years and their seasonal variation or variation with solar cycle. We also study solar X-ray spectra, especially of solar flares. We have detected a Gamma Ray Burst (GRB) and pulsars. Our observation of black hole candidates did not yield satisfactory result yet mainly because of poor collimation (~ 10 deg x 10 deg) by lead collimator which introduces strong background also. Our effort with multiple balloon flights enabled us to have long duration flights. We believe that our procedure is very futuristic and yet at an affordable cost.

  1. Measurements by Mail: Satellite-Controlled Balloons for Making Real-Time Atmospheric Observations Anywhere on Earth

    Science.gov (United States)

    Voss, P. B.

    2008-12-01

    While most of the atmosphere is only a few tens of kilometers overhead, gaining access to this critical region of the earth system is notoriously difficult. Aircraft have been highly successful as atmospheric research platforms but their use can be limited by high costs, complex logistics, and need for ground-support infrastructure. While small Unmanned Aerial Systems (UAS) carry far fewer instruments, they promise to overcome some of these limitations, especially if regulatory and air safety issues can be resolved. Here we describe five years of development on a new type of unmanned platform that can be flown with far fewer restrictions than current UAS. This altitude-controlled balloon can be mailed to collaborators almost anywhere in the world, launched within hours, and flown remotely from our laboratory via satellite link. It can be commanded to perform soundings, track atmospheric layers, or navigate divergent wind fields over periods ranging from days to potentially weeks; meteorological and chemical observations from the balloon are processed on the ground and distributed via the internet in near real time. These controlled balloons have been used in several recent atmospheric research campaigns and are now providing new possibilities for long-distance collaboration, low-cost deployments, and research in previously inaccessible parts of the lower atmosphere.

  2. 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.

  3. Computational Modelling of Multi-folded Balloon Delivery Systems for Coronary Artery Stenting: Insights into Patient-Specific Stent Malapposition.

    Science.gov (United States)

    Ragkousis, Georgios E; Curzen, Nick; Bressloff, Neil W

    2015-08-01

    Despite the clinical effectiveness of coronary artery stenting, percutaneous coronary intervention or "stenting" is not free of complications. Stent malapposition (SM) is a common feature of "stenting" particularly in challenging anatomy, such as that characterized by long, tortuous and bifurcated segments. SM is an important risk factor for stent thrombosis and recently it has been associated with longitudinal stent deformation. SM is the result of many factors including reference diameter, vessel tapering, the deployment pressure and the eccentric anatomy of the vessel. For the purpose of the present paper, virtual multi-folded balloon models have been developed for simulated deployment in both constant and varying diameter vessels under uniform pressure. The virtual balloons have been compared to available compliance charts to ensure realistic inflation response at nominal pressures. Thereafter, patient-specific simulations of stenting have been conducted aiming to reduce SM. Different scalar indicators, which allow a more global quantitative judgement of the mechanical performance of each delivery system, have been implemented. The results indicate that at constant pressure, the proposed balloon models can increase the minimum stent lumen area and thereby significantly decrease SM.

  4. Cutting-Balloon Angioplasty Versus Balloon Angioplasty as Treatment for Short Atherosclerotic Lesions in the Superficial Femoral Artery: Randomized Controlled Trial

    Energy Technology Data Exchange (ETDEWEB)

    Poncyljusz, Wojciech, E-mail: wponcyl@poczta.onet.pl; Falkowski, Aleksander, E-mail: bakhis@hot.pl [Pomeranian Medical University, Department of Interventional Radiology (Poland); Safranow, Krzysztof, E-mail: chrissaf@mp.pl; Rac, Monika, E-mail: carmon@pum.edu.pl [Pomeranian Medical University, Department of Biochemistry and Medical Chemistry (Poland); Zawierucha, Dariusz, E-mail: dariusz13@yahoo.com [Interventional Radiology, Sacred Heart Medical Center, River Bend (United States)

    2013-12-15

    Purpose: To evaluate the treatments of a short-segment atherosclerotic stenosis in the superficial femoral arteries with the cutting balloon angioplasty (CBA) versus conventional balloon angioplasty [percutaneous transluminal angioplasty (PTA)] in a randomized controlled trial. Material and Methods: The study group comprised 60 patients (33 men, 27 women; average age 64 years) with a short ({<=}5 cm) focal SFA de novo atherosclerotic stenosis associated with a history of intermittent claudication or rest pain. The primary end point of this study was the rate of binary restenosis in the treated segment 12 months after the intervention. All patients were evenly randomized to either the PTA or CBA treatment arms. Follow-up angiograms and ankle-brachial index (ABI) measurements were performed after 12 months. The evaluation of the restenosis rates and factors influencing its occurrence were calculated by logistic regression analysis. Results: In the intention-to-treat analysis, restenosis rates after 2-month follow-up were 9 of 30 (30 %) in the PTA group and 4 of 30 (13 %) in the CBA group (p = 0.117). In the actual treatment analysis, after exclusion of patients who required nitinol stent placement for a suboptimal result after angioplasty alone (5 patients in the PTA group and none in the CBA group), restenosis rates were 9 of 25 (36 %) and 4 of 30 (13 %), respectively (p = 0.049). In the intention-to-treat analysis there were also significant differences in ABI values between the PTA and CBA groups at 0.77 {+-} 0.11 versus 0.82 {+-} 0.12, respectively (p = 0.039), at 12 months. Conclusion: Based on the presented results of the trial, CBA seems to be a safer and more effective than PTA for treatment of short atherosclerotic lesions in the superior femoral artery.

  5. The Liege-balloon program. [balloon-borne instruments for high-spectral resolution observations of the sun

    Science.gov (United States)

    Zander, R.

    1974-01-01

    The Liege-balloon program is intended to make high-spectral resolution observations of the sun in the near- and intermediate infrared regions not accessible from the ground. A description of the equipment, followed by a summary of the data obtained till now is presented. Except for ozone whose maximum of concentration lies near 25 Km altitude, the residual mass distribution of the other mentioned molecules decreases with altitude. This is a self-explanatory argument for carrying out spectroscopic observations from platforms transcending the densest layers of the earth's atmosphere. The Liege balloon equipment is primarily intended for very high-resolution solar observations from about 27-30 Km altitude, in all spectral regions between 1.5 and 15.0 microns, not accessible from the ground.

  6. Double Balloon Cervical Ripening Catheter for Control of Massive Hemorrhage in a Cervical Ectopic Pregnancy

    Science.gov (United States)

    Zambrano, Nabila; Reilly, James; Moretti, Michael

    2017-01-01

    Cervical pregnancy can be complicated by perfuse vaginal bleeding. Mechanical compression directed at tamponing the cervical vessels can control hemostasis. There are several types of balloon catheters that have been described for cervical compression. However use of a double balloon catheter is a novel approach for cervical tamponade, as one balloon is positioned below the external cervical os and the second balloon is situated above in the internal cervical os. This compresses the cervix from internal os to external os between the two balloons, forming a “cervical sandwich.” We describe this method of cervical tamponade using a silicone double balloon cervical ripening catheter that rapidly controlled hemorrhage in a patient that failed conservative management with methotrexate. PMID:28261511

  7. 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.

  8. Vessel wall temperature estimation for novel short term thermal balloon angioplasty: study of thermal environment.

    Science.gov (United States)

    Kaneko, Kenji; Nakatani, Eriko; Futami, Hikaru; Ogawa, Yoshifumi; Arai, Tsunenori; Fukui, Masaru; Shimamura, Satoshi; Kawabata, Takashi

    2005-01-01

    We have been proposing novel thermal balloon angioplasty, photo-thermo dynamic balloon angioplasty (PT-DBA). PTDBA realized thermal injury and low pressure dilatation that can prevent restenosis in chronic phase. We aim to determine the most efficient heating condition suit to individual symptom with pre-operation thermal simulation. We analyzed the flow dynamics and heat convection inside the balloon, and investigated heat conduction of balloon film to establish the temperature estimation method among vessel wall. Compared with ex vivo temperature measurement experiment, we concluded that the factors need to be considered for the establishment would be the heat conduction of the flow inside PTDB, heat conduction at the balloon film, and contact thermal resistance between the balloon film and vessel wall.

  9. Five-millimeter balloon trocar site herniation: report of two cases and review of literature.

    Science.gov (United States)

    Kanis, Margaux J; Momeni, Mazdak; Zakashansky, Konstantin; Chuang, Linus; Hayes, Monica Prasad

    2013-01-01

    Trocar site herniation is a well-known potential complication of minimally invasive surgery. We present the cases of two herniations after use of 5-mm non-bladed balloon trocars. In both patients, surgical management was required, with no subsequent sequelae to date. The hernias were attributed to excessive fascial stretching and compression by the balloon. We recommend full-thickness closure of 5-mm ports if a balloon is used or if there was extensive intraoperative manipulation.

  10. 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.

  11. The High Altitude Balloon Experiment demonstration of acquisition, tracking, and pointing technologies (HABE-ATP)

    Science.gov (United States)

    Dimiduk, D.; Caylor, M.; Williamson, D.; Larson, L.

    1995-01-01

    The High Altitude Balloon Experiment demonstration of Acquisition, Tracking, and Pointing (HABE-ATP) is a system built around balloon-borne payload which is carried to a nominal 26-km altitude. The goal is laser tracking thrusting theater and strategic missiles, and then pointing a surrogate laser weapon beam, with performance levels end a timeline traceable to operational laser weapon system requirements. This goal leads to an experiment system design which combines hardware from many technology areas: an optical telescope and IR sensors; an advanced angular inertial reference; a flexible multi-level of actuation digital control system; digital tracking processors which incorporate real-time image analysis and a pulsed, diode-pumped solid state tracking laser. The system components have been selected to meet the overall experiment goals of tracking unmodified boosters at 50- 200 km range. The ATP system on HABE must stabilize and control a relative line of sight between the platform and the unmodified target booster to a 1 microrad accuracy. The angular pointing reference system supports both open loop and closed loop track modes; GPS provides absolute position reference. The control system which positions the line of sight for the ATP system must sequence through accepting a state vector handoff, closed-loop passive IR acquisition, passive IR intermediate fine track, active fine track, and then finally aimpoint determination and maintenance modes. Line of sight stabilization to fine accuracy levels is accomplished by actuating wide bandwidth fast steering mirrors (FSM's). These control loops off-load large-amplitude errors to the outer gimbal in order to remain within the limited angular throw of the FSM's. The SWIR acquisition and MWIR intermediate fine track sensors (both PtSi focal planes) image the signature of the rocket plume. After Hard Body Handover (HBHO), active fine tracking is conducted with a visible focal plane viewing the laser-illuminated target

  12. Huygens Atmospheric Structure Instrument (HASI) test by a stratospheric balloon experiment

    Science.gov (United States)

    Fulchignoni, M.; Gaborit, V.; Aboudam, A.; Angrilli, F.; Antonello, M.; Bastianello, S.; Bettanini, C.; Bianchini, G.; Colombatti, G.; Ferri, F.; Lion Stoppato, P.

    2002-09-01

    We developped a series of balloon experiments parachuting a 1:1 scale mock up of the Huygens probe from an altitude larger than 30 km in order to simulate at planetary scale the final part of the descent of the probe in the Titan atmosphere. The Earth atmosphere represents a natural laboratory where most of the physical parameters meet quite well the bulk condition of Titan's environment, with the exception of temperature. A first balloon experiment has been carried out in June 2001 and the results have been reported at the last DPS (V. Gaborit et al., BAAS 33, 38.03) The mock up of the probe descending in the Titan atmosphere for the Huygens Cassini Mission has been successfully launched with stratospheric balloon from Italian Space Agency Base "Luigi Broglio" in Sicily and recovered on May 30th 2002. The probe has been lifted at 32 km altitude and then released to perform a 45 minutes descent decelerated by parachute, to simulate Huygens mission at Titan. Preliminary aerodynamics study of the probe has focused on the achievement of a descent velocity profile and a spin rate profile, satisfying the Huygens mission to Titan requirements. The descent velocity and spin rate have been calculated by solving a system of ODE describing the translational and rotational motion of the probe trough the earth atmosphere during parachute aided descent Results of these calculations have driven the choice of an appropriate angle of attack of the blades in the bottom of the probe and ballast weight during flight. The probe is hosting spares of HASI sensors, housekeeping sensors and other dedicated sensors, Beagle II UV Sensors and Huygens SSP Tilt Sensor, for a total of 77 acquired sensor channels, sampled during ascent, drift and descent phase. Main goals are i) to verify sensor performance and perform a realistic functional test in dynamical and environmental conditions similar to those during the descent in Titan atmosphere; ii) to investigate impact at ground to check the

  13. Development of ultra-thin polyethylene balloons for high altitude research upto mesosphere

    CERN Document Server

    Kumar, B Suneel; Ojha, D K; Peter, G Stalin; Vasudevan, R; Anand, D; Kulkarni, P M; Reddy, V Anmi; Rao, T V; Sreenivasan, S

    2014-01-01

    Ever since its inception four decades back, Balloon Facility of Tata Institute of Fundamental Research (TIFR), Hyderabad has been functioning with the needs of its user scientists at its focus. During the early nineties, when the X-ray astronomy group at TIFR expressed the need for balloons capable of carrying the X-ray telescopes to altitudes up to 42 km, the balloon group initiated research and development work on indigenous balloon grade films in various thickness not only for the main experiment but also in parallel, took up the development of thin films in thickness range 5 to 6 microns for fabrication of sounding balloons required for probing the stratosphere up to 42 km as the regular 2000 grams rubber balloon ascents could not reach altitudes higher than 38 km. By the year 1999, total indigenisation of sounding balloon manufacture was accomplished. The work on balloon grade ultra-thin polyethylene film in thickness range 2.8 to 3.8 microns for fabrication of balloons capable of penetrating mesosphere ...

  14. High-Altitude Ballooning Program at the Indian Institute of Astrophysics

    CERN Document Server

    Nayak, A; Safonova, M; Murthy, Jayant

    2013-01-01

    We have begun a program of high altitude ballooning at the Indian Institute of Astrophysics, Bangalore. Recent advances in balloons as well as in electronics have made possible scientific payloads at costs accessible to university departments. The primary purpose of this activity is to test low-cost ultraviolet (UV) payloads for eventual space flight, but to also explore phenomena occurring in the upper atmosphere, including sprites and meteorite impacts, using balloon-borne payloads. This paper discusses the results of three tethered balloon experiments carried out at the CREST campus of IIA, Hosakote and our plans for the future. We also describe the stages of payload development for these experiments.

  15. Performance testing of biodegradable mesh-like microporous balloon combined with calcium phosphate cement for vertebroplasty%联合钙盐骨水泥及可降解网状微孔球囊椎体成形的体外实验

    Institute of Scientific and Technical Information of China (English)

    刘训伟; 钟建; 彭湘涛; 魏岱旭; 周涓; 叶勇; 孙钢

    2014-01-01

    背景:椎体成形、椎体后凸成形治疗骨质疏松性椎体压缩性骨折中存在骨水泥外溢、伤椎及临近椎体继发骨折等风险。  目的:验证高分子可降解网状微孔球囊应用于骨质疏松性椎体压缩骨折的可行性。  方法:以聚乳酸-已内酯共聚物为原材料,采用静电纺丝技术制备可降解网状微孔球囊,同时制备涂层球囊,扫描电镜观察其形貌;向球囊内分别注入水和骨水泥,观察外渗情况;测试球囊的断裂强度和断裂伸长率。采用细胞染色法和CCK-8法测试小鼠胚胎成骨细胞在两种球囊上的增殖情况。观察两种球囊在模拟体液、猪胰脂肪酶溶液和新鲜的人血清中的降解。将球囊置入猪椎体后测试球囊的爆破压。将钙盐骨水泥注入球囊后密封,固化后置于6 atm压力的超纯水中,定期检测钙离子浓度。  结果与结论:网状微孔球囊具有良好的纤维形态,粗细分布均匀,存在孔隙;涂层球囊表面无具体形态结构及孔隙存在。与涂层球囊相比,网状微孔球囊具有更好的力学性能和液体渗透性及爆破压力,可防止骨水泥渗漏,促进成骨细胞的黏附与增殖,降解更均匀、稳定,可较好保持钙离子浓度,更利于新骨生长和骨折愈合。%BACKGROUND:Vertebroplasty and kyphoplasty for osteoporotic vertebral compression fractures can result in many complications, such as bone cement leakage and adjacent-level fractures. OBJECTIVE:To verify the possibility of biodegradable mesh-like microporous polymer bal oon for the treatment of osteoporotic vertebral compression fractures. METHODS:Biodegradable mesh-like microporous P(DLLA-CL) bal oons were fabricated by electrospinning technique. Coated bal oons with the same specification was fabricated by coating P(DLLA-CL) onto the same mould. Morphology of the bal oons was observed by scanning electron microscopy. The bal oon

  16. Thromboembolic events associated with single balloon-, double balloon-, and stent-assisted coil embolization of asymptomatic unruptured cerebral aneurysms: evaluation with diffusion-weighted MR imaging

    Energy Technology Data Exchange (ETDEWEB)

    Takigawa, Tomoji; Suzuki, Kensuke; Sugiura, Yoshiki; Suzuki, Ryotaro; Takano, Issei; Shimizu, Nobuyuki; Tanaka, Yoshihiro; Hyodo, Akio [Dokkyo Medical University Koshigaya Hospital, Department of Neurosurgery, Koshigaya, Saitama (Japan)

    2014-12-15

    The introduction of the balloon remodeling and stent-assisted technique has revolutionized the approach to coil embolization for wide-neck aneurysms. The purpose of this study was to determine the frequency of thromboembolic events associated with single balloon-assisted, double balloon-assisted, and stent-assisted coil embolization for asymptomatic unruptured aneurysms. A retrospective review was undertaken by 119 patients undergoing coiling with an adjunctive technique for unruptured saccular aneurysms (64 single balloon, 12 double balloon, 43 stent assisted). All underwent diffusion-weighted imaging (DWI) within 24 h after the procedure. DWI showed hyperintense lesions in 48 (40 %) patients, and ten (21 %) of these patients incurred neurological deterioration (permanent, two; transient, eight). Hyperintense lesions were detected significantly more often in procedures with the double balloon-assisted technique (7/12, 58 %) than with the single balloon-assisted technique (16/64, 25 %, p = 0.05). Occurrence of new lesions was significantly higher with the use of stent-assisted technique (25/43, 58 %) than with the single balloon-assisted technique (p = 0.001). Symptomatic ischemic rates were similar between the three groups. The increased number of microcatheters was significantly related to the DWI abnormalities (two microcatheters, 15/63 (23.8 %); three microcatheters, 20/41 (48.8 %) (p = 0.008); four microcatheters, 12/15 (80 %) (p = 0.001)). Thromboembolic events detected on DWI related to coil embolization for unruptured aneurysms are relatively common, especially in association with the double balloon-assisted and stent-assisted techniques. Furthermore, the number of microcatheters is highly correlated with DWI abnormalities. The high rate of thromboembolic events suggests the need for evaluation of platelet reactivity and the addition or change of antiplatelet agents. (orig.)

  17. Cutting balloon angioplasty for in-stent restenosis of the aortic coarctation in a young boy presenting with systemic hypertension of the upper extremities.

    Science.gov (United States)

    Lee, Meng-Luen

    2013-12-01

    An 8.25-year-old boy was incidentally found to have systemic hypertension of the upper extremities. Blood pressures of the upper extremities were 142-150/86-98 mmHg, and those of the lower extremities 110-116/60-66 mmHg. Doppler echocardiography showed in-stent restenosis of the aortic coarctation. Traditional high-pressure balloon angioplasty failed to dilate this inveterate in-stent restenosis. Instead, a cutting balloon angioplasty was performed. The lumen was dilated from 4.80 mm to 7.89 mm. The pressure gradient dropped from 32 mmHg to 9 mmHg. Blood pressures of the upper extremities were 112-116/76-78 mmHg, and those of the lower extremities 100-104/70-72 mmHg. This paper highlights that a cutting balloon angioplasty can serve as a juste milieu to relieve in-stent restenosis of the aortic coarctation when traditional high-pressure balloon angioplasty is debatable.

  18. 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

  19. NuMED CHEATHAM-PLATINUM STENT AND BALLOON IN BALLOON DELIVERY CATHETER FOR TREATMENT OF NATIVE COARCTATION OF THE AORTA

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ COARCTATION of the aorta (CoA) is a congenital heart defect involving a narrowing of the aorta. The narrowed segment called coarctation is most likely to happen in the segment just after the aortic arch. The narrowing can be removed by surgery or sometimes by a nonsurgical balloon dilation. However, aortic coarctation may recur even after successful surgery or balloon dilation. Fortunately, coarctation can now be treated with nonsurgical balloon dilation associated with implanting a stent using cardiac catheterization. Herein we reported our experience in a 19-year-old boy with CoA who underwent successful covered Cheatham-Platinum (CP) stent implantation for the coarctation.

  20. Effects of rosuvastatin on expression of angiotensin-converting enzyme 2 after vascular balloon injury in rats

    Institute of Scientific and Technical Information of China (English)

    Yong-Hong Li; Qi-Xin Wang; Jing-Wei Zhou; Xian-Ming Chu; Yu-Lin Man; Ping Liu; Bei-Bei Ren; Ting-Ru Sun; Yi An

    2013-01-01

    Objective To investigate the effects and mechanisms of rosuvastatin on angiotensin -converting enzyme 2 (ACE2) in the process of neointimal formation after vascular balloon injury in rats, and to explore the effects of ACE2 and rosuvastatin in restenosis. Methods Thirty-six Wistar rats were randomly allocated into three groups: control group (n = 12), surgery group (n = 12), and statin group (n = 12). Aortic endothelial denudation of rats was performed using 2F balloon catheters. At days 14 and 28 after injury, aortic arteries were harvested to examine the following. Intimal thickening was examined by hematoxylin and eosin staining. We measured angiotensin II (Ang II) and angiotensin 1-7 (Ang-[1–7]) levels by a radioimmunological method or enzyme-linked immunosorbent assay. Protein and mRNA expression of ACE2 and Ang II type 1 receptor (AT1) were investigated by immunohistochemistry, Western blots, and Reverse transcriptase-polymerase chain reaction (RT-PCR). We measured changes in proliferating cell nuclear antigen (PCNA) by immunohistochemistry. The level of phosphorylated extracellular signal regulated kinase 1/2 (P-ERK1/2) was evaluated by Western blotting. Results Proliferation of vascular smooth muscle cells (VSMC) and intimal thickening were higher at day 14 after vascular balloon injury in the surgery group compared with the control group. Proliferation of VSMC was decreased by day 28 after injury, while intimal thickening continued. With rosuvastatin treatment, the extent of VSMC proliferation and intimal thickening was reduced at day 14 and 28 after injury. Ang II and P-ERK levels were significantly increased, Ang-(1–7) levels were significantly decreased, mRNA and protein expressions of ACE2 were significantly decreased, and AT1 expression was significantly increased at days 14 and 28 after vascular balloon injury in the surgery group compared with the control group. PCNA expression was higher in the surgery group than in the control group, and it

  1. A Case Report: Balloon Occlusion Of Vertebral Artery In A Giant Vertebral Artery Aneurysm

    Directory of Open Access Journals (Sweden)

    K. Edraki

    2005-08-01

    Full Text Available Introduction & Background: True aneurysms of extra cranial vertebral arteries are rare. The usual pathogenesis of aneurysms in this location is either penetrating or blunt trauma with resultant pseudo- aneurysm formation. We report a patient with a presumed pseudo-aneurysm of the extra- cranial vertebral artery presenting with painful neck mass, without obvious history of trauma. Case description: A 59-year old man presented with painful left lateral neck mass from 3 month ago with a bruit over it on physical examination. Patient had a history of long term anticoagulant therapy because of chronic lower extremity DVT. Patient was referred to our DSA (Department for angiography. After color Doppler US, CT scan and MR-angiography were performed and a giant aneurysm in left vertebral artery was detected. The lesion was successfully treated by an endovascular technique of balloon occlusion of the verte-bral artery.

  2. Temporary balloon occlusion of internal carotid artery : a simple and reliable clinical test.

    Directory of Open Access Journals (Sweden)

    Sudhakar K

    2000-04-01

    Full Text Available Balloon test occlusion of internal carotid artery has been frequently used in preoperative evaluation of patients with carotid aneurysms, fistulas and skull based neoplasms in whom arterial sacrifice is planned or considered as a possible part of therapy. We present our experience of the test in 28 patients. The test was positive in four and negative in twenty four patients. The results are compared with cross-compression angiography and the outcome following internal carotid artery sacrifice. There were no complications related to the test and the results accurately predicted the tolerance to occlusion of artery. We found the test safe, simple to perform and reliable to preoperatively detect patients at risk of ischaemic stroke following surgical ligation or endovascular occlusion of internal carotid artery.