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Sample records for balloon enteroscopy-assisted ercp

  1. Is endoscopic papillary balloon dilatation really a risk factor for post-ERCP pancreatitis?

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    Fujisawa, Toshio; Kagawa, Koichi; Hisatomi, Kantaro; Kubota, Kensuke; Nakajima, Atsushi; Matsuhashi, Nobuyuki

    2016-01-01

    Endoscopic papillary balloon dilatation (EPBD) is useful for decreasing early complications of endoscopic retrograde cholangio-pancreatography (ERCP), including bleeding, biliary infection, and perforation, but it is generally avoided in Western countries because of a relatively high reported incidence of post-ERCP pancreatitis (PEP). However, as the efficacy of endoscopic papillary large-balloon dilatation (EPLBD) becomes widely recognized, EPBD is attracting attention. Here we investigate whether EPBD is truly a risk factor for PEP, and seek safer and more effective EPBD procedures by reviewing past studies. We reviewed thirteen randomised control trials comparing EPBD and endoscopic sphincterotomy (EST) and ten studies comparing direct EPLBD and EST. Three randomized controlled trials of EPBD showed significantly higher incidence of PEP than EST, but no study of EPLBD did. Careful analysis of these studies suggested that longer and higher-pressure inflation of balloons might decrease PEP incidence. The paradoxical result that EPBD with small-calibre balloons increases PEP incidence while EPLBD does not may be due to insufficient papillary dilatation in the former. Insufficient dilatation could cause the high incidence of PEP through the use of mechanical lithotripsy and stress on the papilla at the time of stone removal. Sufficient dilation of the papilla may be useful in preventing PEP.

  2. ERCP in acute pancreatitis

    Institute of Scientific and Technical Information of China (English)

    Jijo V Cherian; Joye Varghese Selvaraj; Rajesh Natrayan; Jayanthi Venkataraman

    2007-01-01

    BACKGROUND:The role of endoscopic retrograde cholangiopancreatography (ERCP) in the management of acute pancreatitis has evolved over years since its introduction in 1968. Its importance in diagnosing the etiology of pancreatitis has steadily declined with the advent of less invasive diagnostic tools. The therapeutic implications of ERCP in acute pancreatitis are many fold and are directed towards management of known etiological factors or its related complications. This article highlights the current status of ERCP in acute pancreatitis. DATA SOURCES:An English literature search using PubMed database was conducted on ERCP in acute pancreatitis, the etiologies and complications of pancreatitis amenable to endotherapy and other related subjects, which were reviewed. RESULTS: ERCP serves as a primary therapeutic modality for management of biliary pancreatitis in speciifc situations, pancreatitis due to microlithiasis, speciifc types of sphincter of Oddi dysfunction, pancreas divisum, ascariasis and malignancy. In recurrent acute pancreatitis and smoldering pancreatitis it has a deifnite therapeutic utility. Complications of acute pancreatitis including pancreatic-duct disruptions or leaks, benign pancreatic-lfuid collections and pancreatic necrosis can be beneifcially dealt with. Intraductal ultrasound and pancreatoscopy during ERCP are useful in detecting pancreatic malignancy. CONCLUSIONS:The role of ERCP in acute pancreatitis is predominantly therapeutic and occasionally diagnostic. Its role in the management continues to evolve and advanced invasive procedures should be undertaken only in centers dedicated to pancreatic care.

  3. ERCP Related Sepsis

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    Iffet Palabıyıkoglu

    2005-01-01

    Full Text Available Endoscopic procedures performed worldwide have increased considerably in recent years. In addition to diagnosis, many cases previously necessitating surgery now often can be carried out by endoscopic techniques. However, endoscopy has introduced its own infection risk. Most reports of gastrointestinal endoscopy-associated infection describe sepsis after endoscopic retrograde cholangiopancreatography (ERCP in patients with biliary tract obstruction. During this study, which was conducted by Infection Control Committee of Ankara University Hospital, 13 out of 1147 (1.1% and 17 out of 922 patients (1.8% had ERCP related sepsis in 2002 and 2003 respectively, at the ERCP Unit of Gastroenterology Department. Sepsis-caused mortality were 23.1 and 29.4% in 2002 and 2003 respectively. The first four causative agents were Escherichia coli, Pseudomonas spp, Klebsiella spp and Enterobacter spp. Type and frequency of the causative agents remind that both endogenous and exogenous mechanisms are together responsible for the infections emerging from ERCP Unit. Besides, increasing isolation of Pseudomonas spp. brings out the strong need for re-evaluation of infection control measures, mainly effective cleansing and disinfection of endoscopes.

  4. ERCP in acute biliary pancreatitis

    OpenAIRE

    Kapetanos, Dimitrios J

    2010-01-01

    The role of urgent endoscopic retrograde cholangiopancreatography (ERCP) in acute biliary pancreatitis is for many years a subject for disagreement among physicians. Although the evidence seemed to be in favor of performing ERCP, endoscopists usually hesitate to conform to the guidelines. ERCP is an invasive procedure, with complications which can affect patients’ outcome. Recent evidence suggests that we should probably modify our policy, recruiting less invasive procedures, like magnetic re...

  5. Novel Developments in ERCP and EUS

    NARCIS (Netherlands)

    J.-W. Poley (Jan-Werner)

    2013-01-01

    textabstractThis thesis focuses on the diagnostic and therapeutic role of endoscopic retrograde cholangiopancreaticography (ERCP) and endoscopic ultrasonography (EUS) in benign and malignant pancreaticobiliary disease. Since the first practical applications of ERCP and EUS were developed in the firs

  6. Intrahepatic cholangiocarcinoma diagnosed via endoscopic retrograde cholangiopancreatography with a short double-balloon enteroscope

    OpenAIRE

    Ikeura, Tsukasa; Shimatani, Masaaki; Takaoka, Makoto; Matsushita, Mitsunobu; Miyoshi, Hideaki; Kurishima, Akiko; Sumimoto, Kimi; Miyamoto, Sachi; Okazaki, Kazuichi

    2013-01-01

    Endoscopic retrograde cholangiopancreatography (ERCP) using a double-balloon enteroscope (DBE) in patients with bowel reconstruction due to a previous abdominal surgery is now widely accepted. In particular, a short DBE, which has a 2.8-mm working channel and 152-cm working length, is useful for ERCP because of its good rotational and straightening ability and the availability of various conventional ERCP accessories through the working channel. Herein we report a case of intrahepatic cholang...

  7. Complications of ERCP: a prospective study

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    Christensen, Merete; Matzen, Peter; Schulze, Svend;

    2004-01-01

    included in this prospective study. Complications were assessed at the time of ERCP and by postal/telephone contact at 30-days after the procedure. RESULTS: A total of 1177 ERCPs were included in the analysis, of which 56.2% were therapeutic. The 30-day complication rate was 15.9%; the procedure...... analysis. Risk of pancreatitis was increased with age under 40 years ( p = 0.0078), placement of stent ( p = 0.031), and a dilated bile duct ( p = 0.036). CONCLUSIONS: This prospective study confirms that the complication rate of ERCP including therapeutic procedures is high. Cardiopulmonary complications...

  8. Prevention of Post-ERCP Pancreatitis

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    Donnellan, F.; Byrne, Michael F

    2011-01-01

    Post-procedure pancreatitis is the most common complication of endoscopic retrograde cholangio pancreatography (ERCP) and carries a high morbidity and mortality occurring in at least 3%-5% of all procedures. We reviewed the available literature searching for “ERCP” and “pancreatitis” and “post-ERCP pancreatitis”. in PubMed and Medline. This review looks at the diagnosis, risk factors, causes and methods of preventing post-procedure pancreatitis. These include the evidence for patient selectio...

  9. Prophylaxis of post-ERCP pancreatitis: European Society of Gastrointestinal Endoscopy (ESGE) Guideline - updated June 2014.

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    Dumonceau, Jean-Marc; Andriulli, Angelo; Elmunzer, B Joseph; Mariani, Alberto; Meister, Tobias; Deviere, Jacques; Marek, Tomasz; Baron, Todd H; Hassan, Cesare; Testoni, Pier A; Kapral, Christine

    2014-09-01

    This Guideline is an official statement of the European Society of Gastrointestinal Endoscopy (ESGE). It addresses the prophylaxis of post-endoscopic retrograde cholangiopancreatography (post-ERCP) pancreatitis. Main recommendations 1 ESGE recommends routine rectal administration of 100 mg of diclofenac or indomethacin immediately before or after ERCP in all patients without contraindication. In addition to this, in the case of high risk for post-ERCP pancreatitis (PEP), the placement of a 5-Fr prophylactic pancreatic stent should be strongly considered. Sublingually administered glyceryl trinitrate or 250 µg somatostatin given in bolus injection might be considered as an option in high risk cases if nonsteroidal anti-inflammatory drugs (NSAIDs) are contraindicated and if prophylactic pancreatic stenting is not possible or successful. 2 ESGE recommends keeping the number of cannulation attempts as low as possible. 3 ESGE suggests restricting the use of a pancreatic guidewire as a backup technique for biliary cannulation to cases with repeated inadvertent cannulation of the pancreatic duct; if this method is used, deep biliary cannulation should be attempted using a guidewire rather than the contrast-assisted method and a prophylactic pancreatic stent should be placed. 4 ESGE suggests that needle-knife fistulotomy should be the preferred precut technique in patients with a bile duct dilated down to the papilla. Conventional precut and transpancreatic sphincterotomy present similar success and complication rates; if conventional precut is selected and pancreatic cannulation is easily obtained, ESGE suggests attempting to place a small-diameter (3-Fr or 5-Fr) pancreatic stent to guide the cut and leaving the pancreatic stent in place at the end of ERCP for a minimum of 12 - 24 hours. 4 ESGE does not recommend endoscopic papillary balloon dilation as an alternative to sphincterotomy in routine ERCP, but it may be advantageous in selected patients; if this

  10. Frequency and risk factors in the post-ercp pancreatitis in a tertiary care centre

    International Nuclear Information System (INIS)

    Objective: To evaluate the frequency and associated factors in the post-endoscopic retrograde cholangiopancreatography (ERCP) pancreatitis. Study Design: Cross-sectional analytical study. Place and Duration of Study: Endoscopy Suite of Surgical Unit IV, Civil Hospital, Karachi, from December 2009 to November 2010. Methodology: Patients undergoing ERCP were included. Patients who had presented with pancreatitis or raised amylase levels before procedure or patients who had previous history of surgery on the biliary or pancreatic systems were excluded from the study. Pearson chi-square and Fisher's exact test were used for qualitative data and t-test for quantitative data. Significance was taken as p=0.05. Odds ratio was calculated for the qualitative data using 95% confidence interval. Results: Age of the study population ranged from 9 to 90 years (mean age 46.5 A+- 14.94 years, median 45 years). Male to female ratio was 1:1.87. Pancreatitis was seen in 18 patients (3.6%), mild in 15 (3%), moderate in one (0.2%) and severe in 2 (0.4%). Mean amylase level at 4 hours and 24 hours was 280.93 A+- 539.13 and 168.83 A+- 338.34 respectively. Pancreatitis was seen in 15/326 (4.6%) females and 3/174 (1.72%) males. Statistically significant increased risk for pancreatitis was seen in difficult cannulation (9.8%, p = 0.006), prolonged cannulation time (7.6 minute, p = 0.002), pancreatic duct cannulation (13.7%, p = 0.001) and pancreatic duct contrast injection (13.4%, p < 0.001). Conclusion: The frequency of post-ERCP pancreatitis was 3.6%. Difficult cannulation, pancreatic duct cannulation, pancreatic duct contrast injection and balloon sphincteroplasty were associated with higher frequency of post-ERCP pancreatitis. Reuse of ERCP accessories poses no additional risk to the frequency of pancreatitis. (author)

  11. Early Management Experience of Perforation after ERCP

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    Guohua Li

    2012-01-01

    Full Text Available Background and Aim. Perforation after endoscopic retrograde cholangiopancreatography (ERCP is a rare complication, but it is associated with significant mortality. This study evaluated the early management experience of these perforations. Patients and Methods. Between November 2003 and December 2011, a total of 8504 ERCPs were performed at our regional endoscopy center. Sixteen perforations (0.45% were identified and retrospectively reviewed. Results. Nine of these 16 patients with perforations were periampullary, 3 duodenal, 1 gastric fundus, and 3 patients had a perforation of an afferent limb of a Billroth II anastomosis. All patients with perforations were recognized during ERCP by X-ray and managed immediately. One patient with duodenal perforation and three patients with afferent limb perforation received surgery, others received medical conservative treatment which included suturing lesion, endoscopic nasobiliary drainage (ENBD, endoscopic retrograde pancreatic duct drainage (ERPD, gastrointestinal decompression, fasting, broad-spectrum antibiotics, and so on. All patients with perforation recovered successfully. Conclusions. We found that: (1 the diagnosis of perforation during ERCP may be easy, but you must pay attention to it. (2 Most retroperitoneal perforations can recover with only medical conservative treatment in early phase. (3 Most peritoneal perforations need surgery unless you can close the lesion up under endoscopy in early phase.

  12. Pneumothorax following ERCP: Report of Two Cases with Different Pathophysiology

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    Sakis Loizou; Charalampos Andreou; Evangelos Felekouras; Christos Petrides; Constantinos Savva; Athanasios Petrou; Kyriakos Neofytou

    2013-01-01

    In the last thirty years, the widespread use of endoscopic retrograde cholangiopancreatography (ERCP) has radically changed the management of patients with diseases of the extrahepatic biliary tract and pancreas. Pneumothorax is a rare complication of ERCP. We report two cases of pneumothorax following elective ERCP for ductal stone clearance. The first patient was a 45-year-old female, who developed respiratory distress, abdominal pain, and profoundly abdominal distention immediately after t...

  13. Endoscopic retrograde cholangiopancreatography (ERCP)-related adverse events: post-ERCP pancreatitis.

    Science.gov (United States)

    Rustagi, Tarun; Jamidar, Priya A

    2015-01-01

    Post-endoscopic retrograde cholangiopancreatography pancreatitis (PEP) is the most common complication of endoscopic retrograde cholangiopancreatography (ERCP), and not uncommonly is the reason behind ERCP-related lawsuits. Patients at high risk for PEP include young women with abdominal pain, normal liver tests, and unremarkable imaging. Procedure-related factors include traumatic and persistent cannulation attempts, multiple injections of the pancreatic duct, pancreatic sphincterotomy, and, possibly, use of precut sphincterotomy. Aggressive hydration, use of rectal indomethacin, and prophylactic pancreatic stenting can diminish the risk (and likely severity) of PEP. Though hugely beneficial, these measures do not supersede careful patient selection and technique.

  14. ERCP during pregnancy CPRE durante el embarazo

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    Jesús García-Cano

    2012-02-01

    Full Text Available Background and aims: ERCP during pregnancy is always challenging for the entire team performing the endoscopic intervention. In this study techniques and different interventional aspects used at several centres about the clinical experience on ERCP in pregnant women are analyzed. Patients and methods: the practice on ERCP in pregnant women in six centers during a period of ten years is reported. Results: eleven patients were included in the study. Mean age was 30.6 years. Indication for ERCP was always symptomatic common bile duct stone (CBDS disease. Before the procedure abdominal ultrasound was performed at all times and magnetic resonance cholangiopancreatography in four occasions. Conscious sedation by means of midazolam and fentanyl or meperidine was applied. Sphincterotomes and guidewires were used for bilary cannulation. Sometimes, rapid exchange platforms with short-length guidewires controlled by the same endoscopist were employed. Biliary cannulation was confirmed in 9 occasions by bile aspiration. In five procedures, a mean of 30 seconds of fluoroscopy was used, both to verify cannulation and to corroborate complete CBDS clearance. These patients had the pelvic zone protected with a lead shield and radiation dose was measured. Ten biliary sphincterotomies were performed followed by CBDS extraction. Two plastic stents were inserted. Relief of biliary obstruction was attained in all circumstances. Only one patient had hyperamylasemia after ERCP. All pregnant women had healthy foetuses with normal deliveries. Conclusions: with experience, ERCP appears to be a safe technique during pregnancy. With simple measures fluoroscopic time can be diminished or even abolished. It seems that ERCP during pregnancy is underused in our working areas, although it has shown to be a useful technique for relieving biliary obstruction.Antecedentes y objetivos: la CPRE realizada durante el embarazo constituye siempre un reto para todo el equipo que participa

  15. Complications of ERCP: ethical obligations and legal consequences.

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    Rácz, István; Rejchrt, Stanislav; Hassan, Majid

    2008-01-01

    Endoscopic retrograde cholangiopancreatography (ERCP) is a skill and technique demanding high-risk procedure with an overall complication rate of about 5-10%. Pancreatitis remains the most common complication of ERCP, however, bleeding after sphincterotomies, infections and cardiopulmonary complications as well as perforations may also occur. Patient- and procedure-related risk factors of ERCP complications are mainly predictable so that ERCP often can be avoided and substituted for alternative imaging techniques, especially in high-risk patients. Written consent should be obtained for any ERCP to provide documentary evidence that explanation of the proposed procedure and endoscopic treatment was given and that consent was sought and obtained. The investigating doctor remains responsible for ensuring sufficient time for the patient's questions and to make informed decision before the start of any procedure. The most common legal consequence of an ERCP complication is a civil negligence claim for compensation, however, a clinician may in rare cases be faced with criminal proceedings where there is evidence of gross negligence. Analysis of claims against gastroenterologists suggests the conclusion that ERCP should be done for good indications, by trained endoscopists with standard techniques, with good, documented, patient-informed consent and communication before and after the procedure.

  16. Somatostatin administration prior to ERCP is effective in reducing the risk of post-ERCP pancreatitis in high-risk patients

    OpenAIRE

    Zhao, Li-Na; Yu, Tao; LI, CHU-QIANG; LAI, YU; Chen, Qi-Kui

    2014-01-01

    Somatostatin has been extensively studied for the prophylaxis of pancreatitis following endoscopic retrograde cholangiopancreatography (ERCP). However, the results remain controversial. The present retrospective cohort study aimed to investigate the efficacy of pre- and post-ERCP somatostatin administration in the prevention of post-ERCP pancreatitis (PEP). All ERCP procedures performed at one hospital between January 2009 and December 2012 were reviewed. They were divided into three groups b...

  17. Intradiverticular Ampulla of Vater: Personal Experience at ERCP

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    Girolamo Geraci

    2013-01-01

    Full Text Available Introduction. Conflicting results have been reported about the true impact of intradiverticula ampulla (IA on the technical success and complication rate of endoscopic retrograde cholangiopancreatography (ERCP. Patients. A total of 500 patients who underwent ERCP were divided into two groups according to the presence (group A, 81 patients or absence (group B, 419 patients of IA. Success rate, difficulty at cannulation, findings at ERCP, and procedure-related complications were retrospectively reviewed. Results. Successful cannulation was achieved in 100% of group A patients compared to 98% of group B patients (P = ns. There was a significant difference in the type of cannulation that was routinary in group B (, while requiring guidewire in group A (. Cholangitis (, microstones (, dilated common bile duct without stones (, stone recurrence (, and transient postprocedure hyperamylasemia ( were more frequently observed in group A. There was no significant difference in complication rate between both groups. Conclusions. The finding of an IA at ERCP should not be considered a predictor for failed cannulation. IA is associated with post-ERCP transient hyperamylasemia and is a risk factor for biliary stone disease and its recurrence.

  18. Diagnosis of pancreatic carcinoma by ERCP(analysis of 119 cases).

    Institute of Scientific and Technical Information of China (English)

    1994-01-01

    The ERCP findings of 119 patients with pancreatic carcinoma were analysed in detail. Based on ERCP findings,the authors suggested a new clasification for pancreatic carcinoma including 6 types: (1)main pancreatic duct obstruction; (2)main panreatic duct steno

  19. Pneumothorax following ERCP: Report of Two Cases with Different Pathophysiology

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    Kyriakos Neofytou

    2013-01-01

    Full Text Available In the last thirty years, the widespread use of endoscopic retrograde cholangiopancreatography (ERCP has radically changed the management of patients with diseases of the extrahepatic biliary tract and pancreas. Pneumothorax is a rare complication of ERCP. We report two cases of pneumothorax following elective ERCP for ductal stone clearance. The first patient was a 45-year-old female, who developed respiratory distress, abdominal pain, and profoundly abdominal distention immediately after the procedure. Imaging studies revealed the presence of a right-side pneumothorax, pneumomediastinum, pneumoperitoneum, and pneumoretroperitoneum. The second patient was a 94-year-old female, who developed tension pneumothorax with clinical signs of shock during the procedure. Imaging studies revealed the presence of a right-side pneumothorax without free air in the mediastinum and retroperitoneal space. The imaging findings suggest that the occurrence of this rare complication in our patients was caused by entirely different pathophysiological mechanisms. Both patients were successfully treated with chest tube insertion, and no further intervention was required. Clinicians should be aware of this serious complication because delayed diagnosis may involve significant morbidity and mortality risks.

  20. Mass-forming chronic pancreatitis : CT and ERCP features

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    Jung, Dong Jin; Ha, Hyun Kwon; Lee, Yong Suk; Lee, Jin Hwa; Kim, Pyo Nyun; Lee, Moon Gyu; Auh, Yong Ho [Asan Medical Center, Ulsan Univ. College of Medicine, Ulsan (Korea, Republic of)

    1999-11-01

    To describe the CT and ERCP findings of mass-forming chronic pancreatitis. CT and ERCP features were assessed in 13 patients suffering from mass-forming chronic pancreatitis. Diagnosis was on the basis of surgery (n=5), percutaneous needle biopsy (n=3), and clinical follow-up (n=5). Contrast-enhanced CT was available for all patients : five underwent dynamic study and ERCP was performed in 12. On CT and ERCP, both groups were evaluated with regard to the presence and degree of pancreatic ductal dilatation (greater or less than 50 % of total gland width), double duct sign, enhancement pattern, pancreatic parenchymal calcification (site and distribution pattern), mass identification, the direction of infiltration, pancreatic parenchymal atrophy, configuration at the site of obstruction in the pancreatic and common bile duct, lymphadenopathy, vascular encasement, and vascular engorgement or increased collateral vessels in the peripancreatic space. Seven of 13 patients had suffered chronic alcoholism. Serum CA19-9 levels were normal in all patients except one. Common CT and ERCP findings of mass-forming chronic pancreatitis included pancreatic duct dilatation (92.3%), double duct sign (69.2%), inhomogeneous enhancement of the mass (69.2%), and the presence of calcification (61.5%). Patterns of pancreatic duct dilation were irregular in five patients (38.4%) and smooth in three (23.1%). In all patients, duct dilatation was less than 50% of total gland width. Enhancement patterns of the pancreatic mass were inhomogeneous (69.2%), a nonenhancing low attenuation mass (15.3%), and homogeneous enhancement (15.3%). Configuration at the site of obstruction in the pancreatic duct was abrupt termination in two patients (15.4%) and smooth termination in two (15.4%). The common bile duct teminated abruptly in three patients (23.1%), and in four (30.8%) smooth narrowing was abserved. Common findings of mass-forming chronic pancreatitis were duct dilatation of less than 50% of total

  1. Mass-forming chronic pancreatitis : CT and ERCP features

    International Nuclear Information System (INIS)

    To describe the CT and ERCP findings of mass-forming chronic pancreatitis. CT and ERCP features were assessed in 13 patients suffering from mass-forming chronic pancreatitis. Diagnosis was on the basis of surgery (n=5), percutaneous needle biopsy (n=3), and clinical follow-up (n=5). Contrast-enhanced CT was available for all patients : five underwent dynamic study and ERCP was performed in 12. On CT and ERCP, both groups were evaluated with regard to the presence and degree of pancreatic ductal dilatation (greater or less than 50 % of total gland width), double duct sign, enhancement pattern, pancreatic parenchymal calcification (site and distribution pattern), mass identification, the direction of infiltration, pancreatic parenchymal atrophy, configuration at the site of obstruction in the pancreatic and common bile duct, lymphadenopathy, vascular encasement, and vascular engorgement or increased collateral vessels in the peripancreatic space. Seven of 13 patients had suffered chronic alcoholism. Serum CA19-9 levels were normal in all patients except one. Common CT and ERCP findings of mass-forming chronic pancreatitis included pancreatic duct dilatation (92.3%), double duct sign (69.2%), inhomogeneous enhancement of the mass (69.2%), and the presence of calcification (61.5%). Patterns of pancreatic duct dilation were irregular in five patients (38.4%) and smooth in three (23.1%). In all patients, duct dilatation was less than 50% of total gland width. Enhancement patterns of the pancreatic mass were inhomogeneous (69.2%), a nonenhancing low attenuation mass (15.3%), and homogeneous enhancement (15.3%). Configuration at the site of obstruction in the pancreatic duct was abrupt termination in two patients (15.4%) and smooth termination in two (15.4%). The common bile duct teminated abruptly in three patients (23.1%), and in four (30.8%) smooth narrowing was abserved. Common findings of mass-forming chronic pancreatitis were duct dilatation of less than 50% of total

  2. Relationship between post-ERCP pancreatitis and the change of serum amylase level after the procedure

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    AIM: To clarify the relationship between the change of serum amylase level and post-ERCP pancreatitis.METHODS: Between January 1999 and December 2002, 1291 ERCP-related procedures were performed.Serum amylase concentrations were measured before the procedure and 3, 6, and 24 h afterward. The frequency and severity of post-ERCP pancreatitis and the relationship between these phenomena and the change in amylase level were estimated.RESULTS: Post-ERCP pancreatitis occurred in 47 patients (3.6%). Pancreatitis occurred in 1% of patients with normal amylase levels 3 h after ERCP, and in 1%,5%, 20%, 31% and 39% of patients with amylase levels elevated 1-2 times, 2-3 times, 3-5 times, 5-10 times and over 10 times the upper normal limit at 3 h after ERCP,respectively (level < 2 times vs ≥ 2 times, P < 0.001).Of the 143 patients with levels higher than the normal limit at 3 h after ERCP followed by elevation at 6 h,pancreatitis occurred in 26%. In contrast, pancreatitis occurred in 9% of 45 patients with a level higher than two times the normal limit at 3 h after ERCP followed by a decrease at 6 h (26% vs 9%, P < 0.05).CONCLUSION: Post-ERCP pancreatitis is frequently associated with an increase in serum amylase level greater than twice the normal limit at 3 h after ERCP with an elevation at 6 h. A decrease in amylase level at 6 h after ERCP suggests the unlikelihood of development of post-ERCP pancreatitis.

  3. Difficult cannulation as defined by a prospective study of the Scandinavian Association for Digestive Endoscopy (SADE) in 907 ERCPs

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    Halttunen, Jorma; Meisner, Søren; Aabakken, Lars;

    2014-01-01

    BACKGROUND: The definition of a "difficult" cannulation varies considerably in reports of endoscopic retrograde cholangiopancreatography (ERCP). AIMS: To define a difficult cannulation, which translates into higher risk of post-ERCP pancreatitis. PATIENTS AND METHODS: Prospective consecutive reco...

  4. A Case of Mortal Klatskin Tumor with Bacteriemia after ERCP

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    Geyik MF

    2015-10-01

    Full Text Available Due to the late onset of symptoms, Klatskin tumors or hilar cholangiocarcinoma are usually diagnosed late and long-term life expectancy is very low. In this case, an 83-year-old female patient with diagnosis of obesity and depression was admitted to Family Medicine Outpatient Clinic in Duzce University Medical Faculty because of abdominal pain and nausea ongoing for two days. In hepatobiliary ultrasound examination made in Family Medicine Clinic, gallbladder diameter was 50 mm and bile duct was seen distended to 14 mm. With these findings the patient was assessed by Infectious Diseases and Gastroenterology Clinic. She was directed outside the province for an endoscopic retrograde cholangiopancreatography (ERCP. After ERCP clinical situation is further aggravated by developed bacteremia. Due to the late onset of symptoms of the disease, as in our case, and developing bacteremic infections, the disease has resulted in a rapid mortality. In this case, it has been evaluated that table of bacteremic infection superimposed invasive medical procedures resulted to severe prognosis and increases the mortality in elderly patient with Klatskin tumor.

  5. CT and ERCP findings of chronic focal pancreatitis

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    Kim, Hee Soo; Lee, Jong Tae; Yoo, Hyung Sik; Kim, Eun Kyeong [Yonsei Univ. College of Medicine, Seoul (Korea, Republic of)

    1996-10-01

    To evaluate the major radiologic features of chronic focal pancreatitis in various imaging studies, with special emphasis on CT and ERCP findings. From 1991 to 1995, twelve patients were pathologically proved to be suffering from focal chronic pancreatitis after pancreatico-duodenectomy;for retrospective evaluation, imaging studies were available for eight(seven men, one woman;mean age 58.9{+-}6.6, range 47 to 67). Clinical, surgical, and radiological findings, including CT(n=8), ultrasound(n=7), ERCP(n=8) and UGI(n=3) were analysed. Seven male patients had suffered from chronic alcoholism for between 20 and 50 years. Serum bilirubin levels were normal in eight patients and alkaline phosphatase levels were normal in seven patients. Serum CA 19-9 levels were normal in all five patients who had undergone preoperative evaluation. Seven patients(87.5%) showed focal enlargement without definable margin on CT, and five of the six lesions detectable on ultrasound(83.3%) were ill defined hypoechoic nodules. Dilated side branches within lesions were seen in five of eight patients(83.3%) on CT and ERCP. Double duct signs were observed in siven(87.5%) patients, and dilated intrahepatic ducts in six(75%), with diameters ranging from 5 to 8mm(average:5.42{+-}1.96mm). The average ratio of pancreatic duct caliber to gland width was 0.33{+-}0.19. None of the patients had calcification within the lesion and one case showed intraductal calcification. None showed perivascular fat obliteration around the superior mesenteric artery or celiac axis. The average biductal distance between abnormal common bile duct and the immediately adjacent pancreatic duct was 4.0{+-}1.15mm. One of three cases who under went a UGI examination showed severe luminal narrowing and mucosal thickening in the second protion of the duodenum, another showed double contour, and the other merely showed widening of the C-loop of the duodenum. Chronic focal pancreatitis mostly demonstrated ill defined focal

  6. Utility and Safety of ERCP in the Elderly: A Comparative Study in Iran

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    Amir Houshang Mohammad Alizadeh

    2012-01-01

    Full Text Available Background. The present study sought and compared the utility and safety of endoscopic retrograde cholangiopancreatography (ERCP in the elderly and younger people in a great sample of Iranian population. Methods. Our study involved 780 patients undergoing diagnostic and therapeutic ERCP at the Taleghani hospital in Tehran between 2010 and 2011; among them, 558 patients were less than 70 years old and others were 70 years old or older. The patients were prospectively identified and data including clinical and biochemical features, ERCP procedures, ERCP diagnosis, and ERCP complications were gathered on them prospectively. Results. Clinical manifestations were comparable in young and older groups except for hepatosplenomegaly and constipation that were more prevalent in the elderly. Laboratory findings were similar in both groups other than mean levels of alkaline phosphatase, hemoglobin and albumin levels, which were higher in the elderly group. Selective biliary cannulation was technically more successful in the younger than in others (89.0% versus 81.8%. Common bile duct stone was the most frequent diagnosis in both young and older groups (36.6% and 45.9%, resp., whereas ERCP was reported to be normal in 13.4% of the younger and 5.0% of the elderly patients. Post-ERCP complications were observed in 4.8% of patients aged less than 70 years in comparison with 2.3% of patients aged over 70 years. The most frequent complication was pancreatitis that was significantly more developed in young than older patients (3.6% versus 1.5%; OR: 8.216, P=0.015. Conclusion. Diagnostic ERCP is safe and well tolerated in the elderly and even associated with significantly less risk than the younger.

  7. Antisecretory Agents for Prevention of Post-ERCP Pancreatitis: Rationale for Use and Clinical Results

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    Poon RTP

    2003-01-01

    Full Text Available Acute pancreatitis is the most common complication of endoscopic retrograde cholangiopancreatography (ERCP. Over the past decade, there has been notable research on the use of various prophylactic agents in preventing post-ERCP pancreatitis. The most widely investigated drug is the antisecretory agent somatostatin and its analogue octreotide. Both agents are potent inhibitors of exocrine secretion of the pancreas, which plays an important role in the pathogenesis of acute pancreatitis by causing autodigestion of pancreas. In addition, somatostatin and octreotide appear to have anti-inflammatory and cytoprotective effects, both of which may be protective against post-ERCP pancreatitis. Furthermore, somatostatin has been shown to relax the sphincter of Oddi, whereas octreotide increases the basal pressure of the sphincter. Several randomized controlled trials have evaluated the efficacy of somatostatin and octreotide in reducing post-ERCP pancreatitis. The results of these trials vary due to different patient populations and experimental designs. Overall, the available evidence suggests that somatostatin reduces the incidence of post-ERCP pancreatitis, whereas octreotide does not. Whether the difference in efficacy between the two drugs is related to their differential effects on sphincter of Oddi motility or is due to other reasons remains unclear. Although there is some evidence supporting the use of somatostatin in reducing the frequency of post-ERCP pancreatitis, it is widely agreed that generalized treatment of all patients undergoing ERCP with prophylactic somatostatin may not be cost-effective. Further studies should focus on the elucidation of the most cost-effective dosage regimen of somatostatin and it efficacy in patients at high risk for post-ERCP pancreatitis.

  8. Primary endoscopic approximation suture under cap-assisted endoscopy of an ERCP-induced duodenal perforation

    Institute of Scientific and Technical Information of China (English)

    Tae; Hoon; Lee; Byoung; Wook; Bang; Jee; In; Jeong; Hyung; Gil; Kim; Seok; Jeong; Seon; Mee; Park; Don; Haeng; Lee; Sang-Heum; Park; Sun-Joo; Kim

    2010-01-01

    Duodenal perforation during endoscopic retrograde cholangiopancreatography(ERCP) is a rare complication,but it has a relatively high mortality risk.Early diagnosis and prompt management are key factors for the successful treatment of ERCP-related perforation.The management of perforation can initially be conservative in cases resulting from sphincterotomy or guide wire trauma.However,the current standard treatment for duodenal free wall perforation is surgical repair.Recently,several case reports of endosco...

  9. The Diagnostic Value of Endoscopic Balloon Catheter Usage for Detecting Early-Stage Primary Sclerosing Cholangitis in Endoscopic Retrograde Cholangiopancreatography:A Case Report

    Directory of Open Access Journals (Sweden)

    Burhan Ozdil

    2010-02-01

    Full Text Available A 34-year-old woman was admitted to our clinic with abdominal pain, jaundice and pruritus. Endoscopic retrograde cholangiopancreatography was performed for cholestasis. Endoscopic retrograde cholangiopancreatography (ERCP was judged as normal, after a standard ERCP cannula was used for the cholangiogram. However, marked canalicular irregularities were identified in cholangiography when pressurized contrast agent was administrated via balloon catheter. This cholangiographic view was thought to reveal an early-stage alteration of sclerosing cholangitis. Primary sclerosing cholangitis (PSC is a chronic cholestatic liver disease characterized by destruction and fibrosis of the bile ducts. The diagnosis of PSC is based on typical cholangiographic findings, supported by nonspecific clinical signs and symptoms, cholestatic liver biochemical tests, and liver biopsy. Cholangiography is considered to be the gold standard for the diagnosis of PSC. The diagnosis is easy when diffuse multifocal biliary strictures, the hallmarks of the disease, resulting in a ‘beaded’ appearance on ERCP is detected. However, it may reveal a normal image in an early stage of the disease when bile duct changings are not prominent. We think that balloon catheter ERCP appears to facilitate the diagnosis of early-stage primary sclerosing cholangitis.

  10. What Are the Predictors of Post-ERCP Pancreatitis, and How Useful Are They?

    Directory of Open Access Journals (Sweden)

    Sultan S

    2002-11-01

    Full Text Available Acute pancreatitis is one of the major complications of ERCP. It is of paramount importance that we accurately identify which patients will go on to develop post-ERCP pancreatitis. As most ERCPs are performed on an outpatient basis, early evaluation can allow safe discharge of the majority of patients who will not develop post-ERCP pancreatitis or develop only mild symptoms that will be self-limited. Alternatively, early detection of those patients who will go on to develop moderate or severe post-ERCP pancreatitis can guide decisions regarding hospital admission and aggressive management and can help direct the use of targeted therapies that have the potential to prevent or mitigate pancreatic inflammation. Thus, significant efforts have focused on trying to identify predictors of post-ERCP pancreatitis. These parameters can be organized into three categories of tests: 1 pancreatic enzymes as markers of pancreatic injury: serum amylase/urine amylase; 2 markers of proteolytic activation: trypsinogen, trypsinogen activation peptide; 3 markers of systemic inflammation: C-reactive protein, various interleukins such as IL-6 and IL-10. A serum amylase level greater than 4-5 times the upper reference limit in conjunction with clinical symptoms has been shown to be an accurate and reliable predictor of post-ERCP pancreatitis. However, the exact timing and level of amylase elevation remains debatable. Urine testing of amylase and trypsinogen-2 in post-ERCP patients has also been shown to be highly sensitive and specific for detecting pancreatitis. The main advantage of these urinary markers is that they are available as rapid dipstick tests. Serum trypsinogen-2 levels have also been studied in post-ERCP pancreatitis patients; high levels seem to correlate with severity of disease. Among the markers of systemic inflammation, serum CRP is an accurate and readily available laboratory test for predicting severity of post-ERCP pancreatitis, but it appears to

  11. 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.

  12. Weather Balloon Ascent Rate

    Science.gov (United States)

    Denny, Mark

    2016-05-01

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

  13. Papillary cannulation and sphincterotomy techniques at ERCP: European Society of Gastrointestinal Endoscopy (ESGE) Clinical Guideline.

    Science.gov (United States)

    Testoni, Pier Alberto; Mariani, Alberto; Aabakken, Lars; Arvanitakis, Marianna; Bories, Erwan; Costamagna, Guido; Devière, Jacques; Dinis-Ribeiro, Mario; Dumonceau, Jean-Marc; Giovannini, Marc; Gyokeres, Tibor; Hafner, Michael; Halttunen, Jorma; Hassan, Cesare; Lopes, Luis; Papanikolaou, Ioannis S; Tham, Tony C; Tringali, Andrea; van Hooft, Jeanin; Williams, Earl J

    2016-07-01

    This Guideline is an official statement of the European Society of Gastrointestinal Endoscopy (ESGE). It provides practical advice on how to achieve successful cannulation and sphincterotomy at minimum risk to the patient. The Grading of Recommendations Assessment, Development, and Evaluation (GRADE) system was adopted to define the strength of recommendations and the quality of evidence. Main recommendations 1 ESGE suggests that difficult biliary cannulation is defined by the presence of one or more of the following: more than 5 contacts with the papilla whilst attempting to cannulate; more than 5 minutes spent attempting to cannulate following visualization of the papilla; more than one unintended pancreatic duct cannulation or opacification (low quality evidence, weak recommendation). 2 ESGE recommends the guidewire-assisted technique for primary biliary cannulation, since it reduces the risk of post-ERCP pancreatitis (moderate quality evidence, strong recommendation). 3 ESGE recommends using pancreatic guidewire (PGW)-assisted biliary cannulation in patients where biliary cannulation is difficult and repeated unintentional access to the main pancreatic duct occurs (moderate quality evidence, strong recommendation). ESGE recommends attempting prophylactic pancreatic stenting in all patients with PGW-assisted attempts at biliary cannulation (moderate quality evidence, strong recommendation). 4 ESGE recommends needle-knife fistulotomy as the preferred technique for precutting (moderate quality evidence, strong recommendation). ESGE suggests that precutting should be used only by endoscopists who achieve selective biliary cannulation in more than 80 % of cases using standard cannulation techniques (low quality evidence, weak recommendation). When access to the pancreatic duct is easy to obtain, ESGE suggests placement of a pancreatic stent prior to precutting (moderate quality evidence, weak recommendation). 5 ESGE recommends that in patients with a small papilla

  14. Effect of octreotide on the prevention of hyperamylasemia after ERCP in Saudi Arabia: A prospective study

    Directory of Open Access Journals (Sweden)

    Al Awad Naif

    2000-01-01

    Full Text Available Background and objectives: Acute pancreatitis is a serious complication of ERCP. Octreotide as prophylaxis against ERCP-induced hyperamylasemia has produced conflicting results. A review article has called for additional controlled studies. This work was undertaken to see the effect of octreotide in ERCP-induced enzyme changes in a predominantly Saudi population. Subjects &methods: The setting was a university teaching hospital, Eastern Saudi Arabia. The study was prospective, randomized and controlled and the subjects were 50 consecutive adult in-patients. Octreotide, 200 tg subcutaneous, was used in the study group (27 patients. Levels of serum amylase and lipase were estimated three times post-ERCP; mean values were compared with the control group (23 patients using student t test. Results: A total of 50 patients were studied. Their mean age was 43 (range 19 to 70; 30 were female, a male:female ratio of 1:1.5. The two groups were comparable in terms of age, sex and nationality as well as clinical, haematological and biochemical variables. In both groups, the serum levels of amylase and lipase 4 hours post-ERCP were significantly higher compared with base line levels. However, there were no statistical differences between the mean post-ERCP values within as well as between the two groups of patient studied. However, the pattern of response appeared to be different when amylase was compared with lipase. Conclusion: Prophylactic octreotide, in the regimen used in this study, does not protect against post-ERCP hyperamylasemia and hyperlipasemia. The observed apparent difference in the pattern of serum amylase and lipase remains to be confirmed.

  15. 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.

  16. Safety and Yield of Diagnostic ERCP in Liver Transplant Patients with Abnormal Liver Function Tests

    Directory of Open Access Journals (Sweden)

    Jayapal Ramesh

    2014-01-01

    Full Text Available Background. Abnormal liver enzymes postorthotopic liver transplant (OLT may indicate significant biliary pathology or organ rejection. There is very little known in the literature regarding the current role of diagnostic ERCP in this scenario. Aim. To review the utility of diagnostic ERCP in patients presenting with abnormal liver function tests in the setting of OLT. Methods. A retrospective review of diagnostic ERCPs in patients with OLT from 2002 to 2013 from a prospectively maintained, IRB approved database. Results. Of the 474 ERCPs performed in OLT patients, 210 (44.3%; 95% CI 39.8–48.8 were performed for abnormal liver function tests during the study period. Majority of patients were Caucasian (83.8%, male (62.4% with median age of 55 years (IQR 48–62 years. Biliary cannulation was successful in 99.6% of cases and findings included stricture in 45 (21.4 %; biliary stones/sludge in 23 (11%; biliary dilation alone in 31 (14.8%; and normal in 91 (43.3%. Three (1.4% patients developed mild, self-limiting pancreatitis; one patient (0.5% developed cholangitis and two (1% had postsphincterotomy bleeding. Multivariate analyses showed significant association between dilated ducts on imaging with a therapeutic outcome. Conclusion. Diagnostic ERCP in OLT patients presenting with liver function test abnormalities is safe and frequently therapeutic.

  17. Adverse reactions to iodinated contrast media administered at the time of endoscopic retrograde cholangiopancreatography (ERCP).

    Science.gov (United States)

    Pan, Jen-Jung; Draganov, Peter V

    2009-03-01

    Adverse reactions after intravascular administration of iodine contrast media are common and prophylactic regiments consisting of the use of steroids and low osmolality contrast media are highly effective in significantly decreasing the adverse reactions rate. The same type of contrast media are also used for opacification of the biliary tree and the pancreatic duct at the time of endoscopic retrograde cholangiopancreatography (ERCP). Systemic absorption of contrast media after ERCP routinely occurs. Although the adverse reaction rate appears to be very low the exact incidence remains unknown due to the retrospective nature of all reports. Despite the lack of formal recommendations, numerous prophylactic regiments are routinely used prior to ERCP in patients with history of prior reaction to intravascular contrast media. Moreover, the use of prophylaxis has even expanded to patients with no prior reaction to intravascular contrast media who are somehow perceived to be at increase risk (e.g. shellfish allergy). Recently, the first large scale prospective study reported exceedingly low incidence of adverse reaction to high oslmolality iodine-containing contrast media administered at the time of ERCP done without prophylactic premedication even in patients considered to be at the highest risk (prior severe reaction to intravascular contrast media administration). These data suggest that the use of prophylactic regiments prior to ERCP appears to be unnecessary. PMID:19275689

  18. Bursting water balloons

    CERN Document Server

    Lund, Hugh M

    2011-01-01

    The impact and rupture of water-filled balloons upon a flat, rigid surface is studied experimentally, for which three distinct stages of the flow are observed. Due to the impact, waves are formed on the balloon's surface for which the restoring force is tension in the latex. Immediately following rupture of the membrane, a shear instability created by the retraction of the balloon is observed. At later times, a larger-scale growth of the interfacial amplitude is observed, that may be regarded as a manifestation of a phenomenon known as the Richtmyer-Meshkov instability. This flow is closely related to the classical understanding of the Richtmyer-Meshkov instability for when there exists a density difference between the fluids inside and outside the balloon. Further, it is shown experimentally that this growth of the interface may also occur when there is no density difference across the balloon, a situation that does not arise for the standard Richtmyer-Meshkov instability.

  19. Meta-analysis: Nitroglycerin for prevention of post-ERCP pancreatitis

    DEFF Research Database (Denmark)

    Bang, Ulrich Christian; Nøjgaard, C; Andersen, P K;

    2009-01-01

    BACKGROUND: Acute pancreatitis after ERCP is a severe side effect. AIM: To evaluate the preventive effect of nitroglycerin on post-ERCP pancreatitis by a meta-analysis of randomized clinical studies. METHODS: We searched on Pubmed, Embase, Cochrane Library and all abstracts presented at Digestive...... Disease Week and United European Gastrointestinal Week from 2004 to 2008. We used the MeSH terms 'pancreatitis' together (AND) with the terms: 'glyceryl trinitrate', 'glyceryl dinitrate', 'isosorbide dinitrate' or 'nitroglycerin'. RESULTS: Five clinical studies evaluating the incidence of post......-ERCP pancreatitis after administration of nitroglycerin were identified. Meta-analysis including all five studies showed a relative risk (RR) of 0.61 (95% CI; 0.44, 0.86) with the number needed to treat (NNT) of 26 (95% CI: 16, 82). Three studies evaluated nitroglycerin administered by a dermal patch reaching...

  20. Partial stent-in-stent placement of biliary metallic stents using a short double-balloon enteroscopy

    Institute of Scientific and Technical Information of China (English)

    Koichiro Tsutsumi; Hironari Kato; Takeshi Tomoda; Kazuyuki Matsumoto; Ichiro Sakakihara; Naoki Yamamoto; Yasuhiro Noma

    2012-01-01

    Endoscopic intervention is less invasive than percutaneous or surgical approaches and should be considered the primary drainage procedure in most cases with obstructive jaundice.Recently,therapeutic endoscopic retrograde cholangiopancreatography (ERCP) using double-balloon enteroscopy (DBE) has been shown to be feasible and effective,even in patients with surgically altered anatomies.On the other hand,endoscopic partial stent-in-stent (PSIS) placement of selfexpandable metallic stents (SEMSs) for malignant hilar biliary obstruction in conventional ERCP has also been shown to be feasible,safe and effective.We performed PSIS placement of SEMSs for malignant hilar biliary obstruction due to liver metastasis using a short DBE in a patient with Roux-en-Y anastomosis and achieved technical and clinical success.This procedure can result in quick relief from obstructive jaundice in a single session and with short-term hospitalization,even in patients with surgically altered anatomies.

  1. Balloon Design Software

    Science.gov (United States)

    Farley, Rodger

    2007-01-01

    PlanetaryBalloon Version 5.0 is a software package for the design of meridionally lobed planetary balloons. It operates in a Windows environment, and programming was done in Visual Basic 6. By including the effects of circular lobes with load tapes, skin mass, hoop and meridional stress, and elasticity in the structural elements, a more accurate balloon shape of practical construction can be determined as well as the room-temperature cut pattern for the gore shapes. The computer algorithm is formulated for sizing meridionally lobed balloons for any generalized atmosphere or planet. This also covers zero-pressure, over-pressure, and super-pressure balloons. Low circumferential loads with meridionally reinforced load tapes will produce shapes close to what are known as the "natural shape." The software allows for the design of constant angle, constant radius, or constant hoop stress balloons. It uses the desired payload capacity for given atmospheric conditions and determines the required volume, allowing users to design exactly to their requirements. The formulations are generalized to use any lift gas (or mixture of gases), any atmosphere, or any planet as described by the local acceleration of gravity. PlanetaryBalloon software has a comprehensive user manual that covers features ranging from, but not limited to, buoyancy and super-pressure, convenient design equations, shape formulation, and orthotropic stress/strain.

  2. Digitalised endoscopic retrograde pancreatography (D-ERP): A comparison with ERCP

    Energy Technology Data Exchange (ETDEWEB)

    Soimakallio, S.; Pirinen, A.; Suhonen, M.

    1988-06-01

    Cannulation of the papilla of Vater was successful in 49 out of 65 cases (75.4%) and digital imaging of the pancreas in 38% of cases. Visualisation of the pancreatic duct with D-ERP was comparable to that of conventional ERCP. Absent or faint opacification of the parenchyma was seen in 39.5% of patients. Both methods were equally effective for the diagnosis of pancreatic tumours. D-ERP was better than ERCP for the diagnosis of chronic pancreatitis. Two patients (4.1%) had clinical evidence of mild acute pancreatitis following pancreatic duct injections.

  3. European Society of Gastrointestinal Endoscopy (ESGE) Guideline: prophylaxis of post-ERCP pancreatitis.

    Science.gov (United States)

    Dumonceau, J-M; Andriulli, A; Deviere, J; Mariani, A; Rigaux, J; Baron, T H; Testoni, P A

    2010-06-01

    Pancreatitis is the most common complication of endoscopic retrograde cholangiopancreatography (ERCP). Risk factors for post-ERCP pancreatitis (PEP) are both patient-related and procedure-related. Identification of patients at high risk for PEP is important in order to target prophylactic measures. Prevention of PEP includes administration of nonsteroidal inflammatory drugs (NSAIDs), use of specific cannulation techniques, and placement of temporary pancreatic stents. The aim of this guideline commissioned by the European Society of Gastrointestinal Endoscopy (ESGE) is to provide practical, graded, recommendations for the prevention of PEP.

  4. Digitalised endoscopic retrograde pancreatography (D-ERP): A comparison with ERCP

    International Nuclear Information System (INIS)

    Cannulation of the papilla of Vater was successful in 49 out of 65 cases (75.4%) and digital imaging of the pancreas in 38% of cases. Visualisation of the pancreatic duct with D-ERP was comparable to that of conventional ERCP. Absent or faint opacification of the parenchyma was seen in 39.5% of patients. Both methods were equally effective for the diagnosis of pancreatic tumours. D-ERP was better than ERCP for the diagnosis of chronic pancreatitis. Two patients (4.1%) had clinical evidence of mild acute pancreatitis following pancreatic duct injections. (orig.)

  5. Double-balloon-enteroscopy-based endoscopic retrograde cholangiopancreatography in post-surgical patients

    Institute of Scientific and Technical Information of China (English)

    Martin Raithel; Harald Dormann; Andreas Naegel; Frank Boxberger; Eckhart G Hahn; Markus F Neurath; Juergen Maiss

    2011-01-01

    AIM: To evaluate double balloon enteroscopy (DBE) in post-surgical patients to perform endoscopic retrograde cholangiopancreatography (ERCP) and interventions. METHODS: In 37 post-surgical patients, a stepwise approach was performed to reach normal papilla or enteral anastomoses of the biliary tract/pancreas. When conventional endoscopy failed, DBE-based ERCP was performed and standard parameters for DBE, ERCP and interventions were recorded.RESULTS: Push-enteroscopy (overall, 16 procedures) reached enteral anastomoses only in six out of 37 post-surgical patients (16.2%). DBE achieved a high rate of luminal access to the biliary tract in 23 of the remaining 31 patients (74.1%) and to the pancreatic duct (three patients). Among all DBE-based ERCPs (86 procedures), 21/23 patients (91.3%) were successfully treated. Interventions included ostium incision or papillotomy in 6/23 (26%) and 7/23 patients (30.4%),respectively. Biliary endoprosthesis insertion and regular exchange was achieved in 17/23 (73.9%) and 7/23 patients (30.4%), respectively. Furthermore, bile duct stone extraction as well as ostium and papillary dilation were performed in 5/23 (21.7%) and 3/23 patients (13.0%), respectively. Complications during DBE-based procedures were bleeding (1.1%), perforation (2.3%) and pancreatitis (2.3%), and minor complications occurred in up to 19.1%.CONCLUSION: The appropriate use of DBE yields a high rate of luminal access to papilla or enteral anastomoses in more than two-thirds of post-surgical patients, allowing important successful endoscopic therapeutic interventions.

  6. The Descending Helium Balloon

    Science.gov (United States)

    Helseth, Lars Egil

    2014-01-01

    I describe a simple and fascinating experiment wherein helium leaks out of a rubber balloon, thereby causing it to descend. An estimate of the volumetric leakage rate is made by measuring its rate of descent.

  7. Diagnostic role of secretin-enhanced MRCP in patients with unsuccessful ERCP

    Institute of Scientific and Technical Information of China (English)

    László Czakó; Tamás Takács; Zita Morvay; László Csernay; János Lonovics

    2004-01-01

    AIM: To evaluate the value of MR cholangiopancreatography (MRCP) in patients in whom endoscopic retrograde cholangiopancreatography (ERCP) was unsuccessfully performed by experts in a tertiary center.METHODS: From January 2000 to June 2003, 22 patients fulfilled the inclusion criteria. The indications for ERCP were obstructive jaundice (n = 9), abnormal liver enzymes (n = 8),suspected chronic pancreatitis (n = 2), recurrent acute pancreatitis (n = 2), or suspected pancreatic cancer (n = 1).The reasons for the ERCP failure were the postsurgical anatomy (n = 7), duodenal stenosis (n = 3), duodenal diverticulum (n = 2), and technical failure (n = 10). MRCP images were evaluated before and 5 and 10 min after i.v.administration of 0.5 IU/kg secretin.RESULTS: The MRCP images were diagnosed in all 21patients. Five patients gave normal MR findings and required no further intervention. MRCP revealed abnormalities (primary sclerosing cholangitis, chronic pancreatitis, cholangitis, cholecystolithiasis or common bile duct dilation) in 10 patients, who were followed up clinically. Four patients subsequently underwent laparotomy (hepaticojejunostomy in consequence of common bile duct stenosis caused by unresectable pancreatic cancer; hepaticotomy+Kehr drainage because of insufficient biliary-enteric anastomosis; choledochojejunostomy, gastrojejunostomy and cysto-Wirsungo gastrostomy because of chronic pancreatitis, or choledochojejunostomy because of common bile duct stenosis caused by chronic pancreatitis). Three patients participated in therapeutic percutaneous transhepatic drainage. The indications were choledocholithiasis with choledochojejunostomy, insufficient biliary-enteric anastomosis, or cholangiocarcinoma.CONCLUSION: MRCP can assist the diagnosis and management of patients in whom ERCP is not possible.

  8. Pneumothorax following ERCP: Report of four cases and review of the literature

    NARCIS (Netherlands)

    N.J. Schepers (Nicolien ); H.R. van Buuren (Henk)

    2012-01-01

    textabstractWe report four patients with pneumothorax as a complication of ERCP with sphincterotomy. With conservative treatment all patients recovered. Previously, 16 comparable cases have been reported in the literature. The main risk factor for this rare complication seems (pre-cut) sphincterotom

  9. Factors and Outcomes Associated with MRCP Use prior to ERCP in Patients at High Risk for Choledocholithiasis

    Directory of Open Access Journals (Sweden)

    Gobind Anand

    2016-01-01

    Full Text Available Background. Consensus guidelines recommend that patients at high risk for choledocholithiasis undergo endoscopic retrograde cholangiopancreatography (ERCP without additional imaging. This study evaluates factors and outcomes associated with performing magnetic resonance cholangiopancreatography (MRCP prior to ERCP among patients at high risk for choledocholithiasis. Methods. An institutional administrative database was searched using diagnosis codes for choledocholithiasis, cholangitis, and acute pancreatitis and procedure codes for MRCP and ERCP. Patients categorized as high risk for choledocholithiasis were evaluated. Results. 224 patients classified as high risk, of whom 176 (79% underwent ERCP only, while 48 (21% underwent MRCP prior to ERCP. Patients undergoing MRCP experienced longer time to ERCP (72 hours versus 35 hours, p<0.0001, longer length of stay (8 days versus 6 days, p=0.02, higher hospital charges ($23,488 versus $19,260, p=0.08, and higher radiology charges ($3,385 versus $1,711, p<0.0001. The presence of common bile duct stone(s on ultrasound was the only independent factor associated with less use of MRCP (OR 0.09, p<0.0001. Conclusions. MRCP use prior to ERCP in patients at high risk for choledocholithiasis is common and associated with greater length of hospital stay, higher radiology charges, and a trend towards higher hospital charges.

  10. Universal stratospheric balloon gradiometer

    Science.gov (United States)

    Tsvetkov, Yury; Filippov, Sergey; Brekhov, Oleg; Nikolaev, Nikolay

    The study of the interior structure of the Earth and laws of its evolution is one of the most difficult problems of natural science. Among the geophysical fields the anomaly magnetic field is one of the most informational in questions of the Earth’s crust structure. Many important parameters of an environment are expedient for measuring at lower altitudes, than satellite ones. So, one of the alternatives is stratospheric balloon survey. The balloon flight altitudes cover the range from 20 to 50 km. At such altitudes there are steady zone air flows due to which the balloon flight trajectories can be of any direction, including round-the-world (round-the-pole). For investigation of Earth's magnetic field one of the examples of such sounding system have been designed, developed and maintained at IZMIRAN and MAI during already about 25 years. This system consists of three instrumental containers uniformly placed along a vertical 6 km line. Up today this set has been used only for geomagnetic purposes. So we describe this system on example of the measuring of the geomagnetic field gradient. System allows measuring a module and vertical gradient of the geomagnetic field along the whole flight trajectory and so one’s name is - stratospheric balloon magnetic gradiometer (SMBG). The GPS-receivers, located in each instrumental container, fix the flight coordinates to within several tens meters. Process of SBMG deployment, feature of the exit of rope from the magazine at the moment of balloon launching has been studied. Used magazine is cellular type. The hodograph of the measuring base of SBMG and the technique of correction of the deviations of the measuring base from the vertical line (introduction of the amendments for the deviation) during the flight have been investigated. It is shown that estimation of the normal level of values of the vertical gradient of the geomagnetic field is determined by the accuracy of determining the length of the measuring base SBMG

  11. 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...

  12. 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...

  13. JACEE long duration balloon flights

    International Nuclear Information System (INIS)

    JACEE balloon-borne emulsion chamber detectors are used to observe the spectra and interactions of cosmic ray protons and nuclei in the energy range 1-100A TeV. Experience with long duration mid-latitude balloon flights and characteristics of the detector system that make it ideal for planned Antarctic balloon flights are discussed. 5 refs., 2 figs

  14. Temporary duodenal stenting as a bridge to ERCP for inaccessible papilla due to duodenal obstruction: a retrospective study

    Science.gov (United States)

    Donatelli, Gianfranco; Cereatti, Fabrizio; Dumont, Jean-Loup; Dhumane, Parag; Tuszynski, Thierry; Derhy, Serge; Meduri, Alexandre; Vergeau, Bertrand Marie; Meduri, Bruno

    2016-01-01

    Background and study aims: Duodenal obstruction may prevent performance of endoscopic retrograde cholangiopancreatography (ERCP). Percutaneous transhepatic biliary drainage (PTBD) or Endoscopic ultrasonograhy-guided biliary access (EUS-BD) are alternative treatments but are associated with a higher morbidity and mortality rate. The aim of the study is to report overall technical success rate and clinical outcome with deployment of temporary fully or partially covered self-expanding duodenal stent (pc/fcSEMS) as a bridge to ERCP in case of inaccessible papilla due to duodenal strictures. Patients and methods: This retrospective study included 66 consecutive patients presenting with a duodenal stricture impeding the ability to perform an ERCP. Provisional duodenal stenting was performed as a bridge to ERCP. A second endoscopic session was performed to remove the provisional stent and to perform an ERCP. Afterward, a permanent duodenal stent was delivered if necessary. Results: Sixty-six duodenal stents (17 pcSEMS and 49 fcSEMS) were delivered with a median indwelling time of 3.15 (1 – 7) days. Two migrations occurred in the pcSEMS group, 1 of which required lower endoscopy for retrieval. No other procedure-related complications were observed. At second endoscopy a successful ERCP was performed in 56 patients (85 %); 10 patients (15 %) with endoscopic failure underwent PTBD or EUS-BD. Forty patients needed permanent duodenal stenting. Conclusions: Provisional removable covered duodenal stenting as a bridge to ERCP for duodenal obstruction is safe procedure and in most cases allows successful performance of therapeutic ERCP. This technique could be a sound option as a step up approach before referring such cases for more complex techniques such as EUS-BD or PTBD. PMID:27652301

  15. MRCP compared to diagnostic ERCP for diagnosis when biliary obstruction is suspected: a systematic review

    International Nuclear Information System (INIS)

    Magnetic resonance cholangiopancreatography (MRCP) is an alternative to diagnostic endoscopic retrograde cholangiopancreatography (ERCP) for investigating biliary obstruction. The use of MRCP, a non-invasive procedure, may prevent the use of unnecessary invasive procedures. The aim of the study was to compare the findings of MRCP with those of ERCP by the computation of accuracy statistics. Thirteen electronic bibliographic databases, covering biomedical, science, health economics and grey literature were searched. A systematic review of studies comparing MRCP to diagnostic ERCP in patients with suspected biliary obstruction was conducted. Sensitivity, specificity, likelihood ratios, acceptability and adverse events were reported. 25 studies were identified reporting several conditions including choledocholithiasis (18 studies), malignancy (four studies), obstruction (three studies), stricture (two studies) and dilatation (five studies). Three of the 18 studies reporting choledocholithiasis were excluded from the analysis due to lack of data, or differences in study design. The sensitivity for the 15 studies of choledocholithiasis ranged from 0.50 to 1.00 while specificity ranged from 0.83 to 1.00. The positive likelihood ratio ranged: from 5.44–47.72 and the negative likelihood ratio for the 15 studies ranged from 0.00–0.51. Significant heterogeneity was found across the 15 studies so the sensitivities and specificities were summarised by a Receiver Operating Characteristic (ROC) curve. For malignancy, sensitivity ranged from 0.81 to 0.94 and specificity from 0.92 to 1.00. Positive likelihood ratios ranged from 10.12 to 43 and negative likelihood ratios ranged from 0.15 to 0.21, although these estimates were less reliable. MRCP is a comparable diagnostic investigation in comparison to ERCP for diagnosing biliary obstruction

  16. Analysis of radiation exposure to medical staff and patients during ERCP in Uruguay

    International Nuclear Information System (INIS)

    Background.The ERCP procedure requires the use of fluoroscopy with the subsequent exposure to ionizing radiation. The doses received by patients, physicians and assistants in the endoscopy have never been recorded in our area. This analysis describes the findings of the MIREDUy study (measuring radiation in digestive endoscopy in Uruguay). Objective. To determine radiation exposure received by patients, physicians and assistants during ERCP. Methods. Data were collected from 33 procedures conducted by four endoscopists, supported by endoscopy assistants. All staff took basic radiation-protection measures. The magnitudes measured were the kerma area product (KAP) for the patient and the effective dose (E) and the equivalent doses in hand (HM) and lens of the eyes (HC) for the operators. Results. Mean value for PKA was 24 Gy.cm2 (range: 0.04-71) equivalent to 312 chest x-rays. The mean fluoroscopy time was 2.3 minutes (range: 0.45 a 5.70 minutes). The E mean per procedure was 3.69, 5.14 y 3.69 μSv, for physician, first and second assistant respectively. The dose in hand for the physician was 19.4 μSv and the dose in lens was 7.94 μSv. Conclusions. The first results of measuring ERCP radiation doses in Uruguay are presented. These procedures expose the patient and staff to measurable radiation doses, which should be taken into account to minimize their risks. (authors)

  17. Pharmacological Prevention of Post-ERCP Pancreatitis: Which Therapy is Best?

    Directory of Open Access Journals (Sweden)

    Mariani A

    2003-01-01

    Full Text Available The effectiveness of the pharmacological prevention of post-ERCP pancreatitis can be established only from large controlled randomized studies. Over the last decade, fifteen studies dealt with these characteristics and a cumulative series of about 3,000 non-selected patients were evaluated. Cumulating the data of the placebo groups, the median incidence of post-ERCP pancreatitis was 8.7% (mean 9.3%, the range varied from 1.6 to 17.7% likely due to case mix and/or different criteria defining acute pancreatitis. These variables, other than differences in the modalities of the administration of the drugs, could explain their contrasting effectiveness between the studies. Somatostatin and octreotide were the prophylactic drugs more frequently experimented (8 studies followed by corticosteroids such as hydrocortisone, prednisone or methylprednisolone (four studies and gabexate (three studies. While octreotide was confirmed to be ineffective, somatostatin and gabexate seem to be the best for the prevention of post-ERCP pancreatitis, but both can present some limits such as unreported sample size calculation in the statistical analysis for somatostatin studies and lack of widespread commercial availability for gabexate. Pharmacoeconomic studies are lacking in English language literature. On this point of view, it seems reasonable and preferable a selective as opposed to universal pharmacological prophylaxis but, actually, the experimented pre-treatments in high-risk patients are ineffective.

  18. Single shot MR-cholangiopancreatography (MRCP) by a fast acquisition spin echo sequence (FASE). A substitute for ERCP?; Einzelschuss MR-Cholangiopankreatographie (MRCP) mittels einer ``Fast-Acquisition-Spin-Echo``-Sequenz (FASE). Ersatz fuer die ERCP?

    Energy Technology Data Exchange (ETDEWEB)

    Schulte, B.; Beyer, D.; Wedekind, G [Inst. fuer Diagnostische und Interventionelle Radiologie, Krankenhaus Porz am Rhein, Koeln (Germany); Meuser, W. [Medizinische Klinik, Krankenhaus Porz am Rhein, Akademisches Lehrkrankenhaus der Univ. zu Koeln (Germany)

    1998-01-01

    Purpose: 118 patients with suspected obstruction of the biliary tract or pancreatic duct were examined to evaluate the accuracy of MR cholangiopancreatography (MRCP) in comparison with diagnostic findings in endoscopic retrograde cholangiopancreatography (ERCP). Results: In all MRCP examinations images of satisfactory quality were obtained. In cases of obstruction of the biliary or pancreatic duct, locations and lengths of stenoses were correctly demonstrated. Gallstones within the gallbladder or in the extrahepatic bile ducts were also properly visualised in MRCP. Stenoses caused by non-depicted pancreatic carcinoma, gallbladder carcinoma, or segmental pancreatitis were reliably shown. Conclusion: Even if MRCP will not replace ERCP, a number of clinical applications for non-invasive MRCP examination arise: Primary diagnosis in patients with obstructive jaundice, obstruction of the biliary or pancreatic duct, if ERCP is not possible due to anatomic reason and in patients scheduled for laparoscopic cholecystectomy. (orig./AJ) [Deutsch] Ziel: Zur Beurteilung der diagnostischen Wertigkeit der MR-Cholangiopankreatographie in Ergaenzung zur endoskopischen retrograden Cholangiopankreatographie (ERCP) untersuchten wir 118 Patienten unter dem Verdacht auf Obstruktion des Gallenwegsystems bzw. des Pankreasganges. Ergebnisse: Alle MRCP-Untersuchungen ergaben Aufnahmen von diagnostischer Qualitaet. Obstruktionen des Ductus hepaticus, Ductus choledochus sowie des Pankreasganges konnten sowohl in Laenge als auch hinsichtlich der Lokalisation korrekt beschrieben werden. Ebenso liessen sich karzinom- oder entzuendungsbedingte Gangstenosen nachweisen. Gallenblasensteine und Gallenwegkonkremente wurden zuverlaessig dargestellt. Schlussfolgerung: Selbst wenn die MRC letztendlich die ERCP nicht ersetzt, so konkurriert sie in einigen Faellen mit der diagnostischen ERCP. Die ERCP kann somit gezielter aus therapeutischen Gesichtspunkten angewendet werden. (orig./AJ)

  19. Post-ERCP pancreatitis. A single center experience and an update on prevention strategies.

    Science.gov (United States)

    D'Arpa, Francesco; Tutino, Roberta; Battaglia, Emanuele Onofrio; Orlando, Giuseppina; Salamone, Giuseppe; Licari, Leo; Gulotta, Gaspare

    2015-01-01

    La pancreatite rimane ad oggi la maggiore complicanza dell’ERCP nonostante numerose misure tese alla sua prevenzione siano state proposte negli anni. La sua incidenza è del 3.5% e raggiunge in alcune serie di casi anche il 25%; solitamente è lieve-moderata nel 90%. La stratificazione dei pazienti in base al grado di rischio è necessaria per destinare i casi più complessi a centri di terzo livello presenti nel territorio; per far questo, un’analisi dei possibili fattori di rischio è stata originariamente proposta da Freeman ed è poi stata modificata dall’ESGE sulla base dei contributi dei singoli centri, con importanti modifiche. Il presente studio analizza l’incidenza di pancreatite post- ERCP in un centro di terzo livello analizzando, sulla scorta dei fattori di rischio proposti, l’aderenza dei dati. Negli anni 2012-2013, 492 pazienti sono stati sottoposti ad ERCP da due esperti endoscopisti. Secondo le classificazioni di Freeman e Cotton sono state osservate 14 PEP (2.8%), di cui 6 lievi, 4 moderate e 4 severe. È stata condotta un’analisi multivariata che ha evidenziato come fattori di rischio l’elevato numero di tentativi di incannulamento della via biliare e l’iniezione di mezzo di contrasto nel dotto pancreatico; sono risultati fattori protettivi l’early pre-cut e il fallimento della procedura con la sua interruzione. Nella discussione sono state inoltre brevemente analizzate le varie misure profilattiche, quali il posizionamento di protesi pancreatiche e l’utilizzo dei FANS. È interessante notare come i nostri risultati rafforzino gli ultimi orientamenti nel management dell’ERCP, circa l’utilizzo della tecnica di incannulamento filo-guidato e del pre-cut; questi infatti riducono il numero di tentativi di incannulamento ed il conseguente trauma alla papilla promuovendo un incannulamento biliare selettivo e prevenendo l’iniezione di mezzo di contrasto nel dotto pancreatico. Nonostante la pancreatite sia un

  20. Nursing comprehend of treating common duct stones in youth by ERCP%ERCP 在治疗青年胆管结石的护理体会

    Institute of Scientific and Technical Information of China (English)

    王倩; 王缘

    2014-01-01

    目的:探讨ERCP治疗青年胆总管结石患者的护理体会。方法对25例青年胆总管结石患者行内镜下治疗。加强护理,做好术后病情的观察及并发症处理。结果25例胆总管结石患者,成功25例,成功率100%,并发症13例,胰腺炎4例,高淀粉酶血症8例,急性胆管炎1例,均经内科保守治疗后治愈,平均住院时间8 d。结论青年胆管结石患者ERCP术后并发胰腺炎比例较大,术前及时心理干预,精心细致的护理,术后严密监测并发症,及时处理,可有效提高疗效,促进患者的早日康复。%Objective To discuss the nursing comprehend of treating common duct stones in youth by ERCP.Methods We did the endoscopic therapy in 25 young patients with common duct stones , and given them intensive nursing , especially in observing the body condition and treating the complications .Results Among these 25 patients, all of their ERCP therapies were succeed (100%).However, 13 of them got complications , 4 patients got acute pancreatitis , 8 patients got high blood amylase and 1 patient got acute cholangitis .All of them were cured by internal medicine care , and the average hospital stay was 8 days.Conclusions Pancreatitis caused by ERCP therapy may occupy high rate in young patients with common duct stones .And timely mental intervention , carefully nursing , monitoring complications and promptly treatment can utility improve the curative effect, insure the quickly recovering .

  1. 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.

  2. 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.

  3. 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...

  4. Role of nonsteroidal anti-inlfammatory drugs in the prevention of post-ERCP pancreatitis:a meta-analysis

    Institute of Scientific and Technical Information of China (English)

    Hui-Fen Dai; Xiao-Wen Wang; Kui Zhao

    2009-01-01

    BACKGROUND:The role of prophylactic nonsteroidal anti-inlfammatory drugs (NSAIDs) for reduction of pancreatitis after endoscopic retrograde cholangiopancreatography (ERCP) is debated. We performed a meta-analysis of all published randomized controlled trials to evaluate the efifcacy of NSAIDs in the prevention of post-ERCP pancreatitis. DATA SOURCES:Searches were conducted in the databases PubMed, EMBASE and the Cochrane Library. Six randomized clinical trials that fuliflled the inclusion criteria and addressed the clinical questions of this analysis were further assessed. Data were extracted by two independent observers according to predetermined criteria. RESULTS:The risk of pancreatitis was lower in the NSAID group than in the placebo group (OR: 0.46, 95% CI: 0.32 to 0.65,P<0.0001). Two hours after ERCP, prophylactic administration of NSAIDs was associated with a lower serum amylase level (WMD: -91.09, 95% CI: -149.78 to -32.40, P=0.002), but there was no difference in mean 24-hour serum amylase values (WMD: -379.00, 95% CI: -805.75 to 47.76,P=0.08). No deaths or NSAID-related complications were noted. CONCLUSIONS:Prophylactic administration of NSAIDs can reduce the incidence of post-ERCP pancreatitis;this administration in patients undergoing ERCP is recommended. Further randomized controlled trials are required before its introduction into routine care.

  5. New Frontiers in the Pharmacological Prevention of Post-ERCP Pancreatitis: The Cytokines

    Directory of Open Access Journals (Sweden)

    Demols A

    2003-01-01

    Full Text Available Acute pancreatitis is a major complication of endoscopic retrograde cholangiopancreatography (ERCP, its incidence varying with the indications for the procedure (less than 5% for the management of common bile duct stones and up to 20% in the case of sphincter of Oddi dysfunction and also with events occurring during the ERCP such as acinarization and pancreatic sphincterotomy. If the triggering event of premature intra-acinar activation of trypsinogen is unknown, the acinar cell injury leads to oxidative stress, nuclear translocation of nuclear factor kappa B and subsequent transcription of chemo- and pro-inflammatory cytokines. These events are followed by chemoattraction and activation of monomacrophages, T lymphocytes and neutrophils which are responsible for acinar necrosis and amplification of the pro-inflammatory cascade. Finally, after amplification by Kupffer cells, systemic inflammatory response syndrome and multiple organ failure occur. All these events take place within a very short period of time, thus offering a very short therapeutic window during which it is theoretically possible to modulate the severity of human pancreatitis. Prophylactic immunomodulation of this pro-inflammatory cascade is attractive, using anti-inflammatory cytokines, specific inhibitors of pro-inflammatory cytokines or inhibitors of the nuclear translocation of the nuclear factor kappa B. Good results have been obtained in experimental models, reducing the acute pancreatitis severity and its systemic complications. The use of immunomodulators in the prevention of human post-ERCP pancreatitis is actually restricted to recombinant interleukin-10. Three of four randomized clinical trials, confirmed by a meta-analysis, have shown that prophylactic injection of recombinant interleukin-10 can significantly reduce the incidence of acute pancreatitis and may decrease the length of the hospital stay. The use of recombinant interleukin-10 in this indication has to be

  6. 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.

  7. 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.

  8. Comparison between magnetic resonance cholangiopancreatography (MRCP) and endoscopic retrograde cholangiopancreatography (ERCP); Comparacion entre calongiografia por resonancia magnetica (CPRM) y colangiografia retrograda endoscopia (CPRE)

    Energy Technology Data Exchange (ETDEWEB)

    Pulpeiro, J. R.; Armesto, V. [Clinica Nosa Senora dos Ollos Grandes. Lugo (Spain); Lopez-Roses, L.; Lancho, A.; Gonzalez, A. [Hospital Xeral. Lugo (Spain)

    2000-07-01

    To assess the correlation between magnetic resonance cholangiopancreatography (MRCP) and endoscopic retrograde cholangiopancreatography (ERCP). The authors carried out a prospective study of 71 patients suspected of having biliary diseases. MRCP was performed, followed by ERCP.MRCP was done with a 1.5-T system using hypergradients, abdominal phase array coil and single-shot fast spin-echo (SSFSE) sequences with maximum signal intensity in T2-weighted images. This sequence only provides images of the fluids, similar to those obtained with ERCP. The results of ERCP were employed as a reference standard. Thirty patients were found to have stenosis (19 malignant and 11 benign). 25 had choledocholithiasis and 16 showed no abnormal findings. The correlation was complete in patients with stenosis. MRCP detected 23 cases of choledocholithiasis (ERCP was normal in the remaining two patients, but calculi were discovered on shpincterotomy). MRCP confirmed the normal condition of the bile duct in 12 of the 16 patients free of biliary disease (2 patients in whom ERCP had been normal had been diagnosed as having bile duct dilatation due to choledocholithiasis 24 hours and 10 days earlier, respectively, and two cases of presented ectasia due to fibrosis of the sphincter of Oddi showed good emptying during ERCP). MRCP using SSFSE is highly correlated with ERCP, which should be reserved for cases in which the diagnosis is in doubt or endoscopic management is necessary. (Author) 25 refs.

  9. 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.

  10. Therapeutic transjejunal ERCP for patients with digestive tract reconstruction%经腹壁空肠造瘘行ERCP在消化道重建患者中的临床应用

    Institute of Scientific and Technical Information of China (English)

    张迎春; 麻树人; 杨卓; 高飞; 高峰; 李顺明; 程广明; 金红旭; 刘宝军

    2014-01-01

    Objective To investigate the effectiveness and safety of jejunostomy ERCP via the abdominal wall in patients with digestive tract reconstruction.Methods Data of 22 patients with digestive tract reconstruction,who underwent ERCP by jejunostomy,were retrospectively analyzed for effectiveness and complications.Results Jejunostomy through the abdominal wall was completed in all patients.ERCP was successfully completed in 21 patients,where the duodenal papilla or anastomotic stoma were reached,and the time was 6 to 34 minutes,mean 18.4 minutes.It failed in one case and the success rate was 95.5%.Under endoscopy,anastomotic stenosis was diagnosed in 10 cases,tumor recurrence in 8 cases,choledocholithiasis in 1 case,stent blockage in 1 case,no abnormality was seen in 1 case.Plastic stenting was performed in 9 patients,metal stenting in 7 patients,replacement plastic stent in 1 patient,stone removal in 1 patient,cylindrical balloon dilation in 2 patients.Post-ERCP complications included 4 cases of incisional infection,1 biliary tract infection and 1 intestinal fistula.Conclusion Jejunostomy ERCP through the abdominal wall in patients with digestive tract reconstruction is safe,effective and minimally invasive,which can be applied to clinical practice.%目的 探讨消化道重建患者经腹壁空肠造瘘行ERCP诊疗的疗效及安全性.方法 回顾性分析22例经腹壁空肠造瘘行ERCP诊疗的消化道重建患者的疗效及并发症发生情况.结果 22例均一次性完成经腹壁空肠造瘘,其中21例(95.5%)成功完成ERCP诊疗,内镜通过瘘口到达乳头或胆肠吻合口处的时间为6~34 min,平均为18.4 min;另外1例失败.ERCP诊断吻合口狭窄10例、肿瘤复发8例、胆总管结石1例、内支架堵塞1例,1例未见明显异常.置入塑料胆道内支架9例,置入金属胆道支架7例,更换塑料内支架1例,取石1例,仅行柱状球囊扩张2例.术后并发早期切口感染4例,并发胆道感染1例,并发肠瘘1

  11. Does glyceryl nitrate prevent post-ERCP pancreatitis? A prospective, randomized, double-blind, placebo-controlled multicenter trial

    DEFF Research Database (Denmark)

    Nøjgaard, Camilla; Hornum, Mads; Elkjaer, Margarita;

    2009-01-01

    OBJECTIVE: Acute pancreatitis is the most dreaded complication of ERCP. Two studies have shown a significant effect of glyceryl nitrate (GN) in preventing post-ERCP pancreatitis (PEP). We wanted to evaluate this promising effect in a larger study with a realistically precalculated incidence of PEP...... with the PL group was not statistically significant (P = .11). Thirteen had mild pancreatitis (4 in the GN group, 9 in the PL group), 26 had moderate pancreatitis (9 in the GN group, 17 in the PL group), and 8 had severe pancreatitis (5 in the GN group, 3 in the PL group). Headache (P < .001) and...

  12. ERCP wire systems:The long and the short of it

    Institute of Scientific and Technical Information of China (English)

    Shilpa Chandrupatla Reddy; Peter V Draganov

    2009-01-01

    Guidewires are routinely used at the time of endoscopic retrograde cholangiopancreatography (ERCP) to gainand maintain access to the desired duct and aid in the advancement of various devices. Limitations of the traditional long-wire systems have led to the introduction of three proprietary short-wire systems.These systems differ in many respects but share two main principles: They lock a shorter wire in position to allow advancement or removal of various devices without displacement of the wire and they all allow for physician control of the wire. In this comprehensive review, we describe the key features of the three currently available short-wire systems: RX, Fusion and V systems. We also focus on the potential benefits and drawbacks that accompany the short-wire concept as a whole and each specific system in particular. Although the available data are limited, it appears that the use of the short-wire systems lead to reduced procedure,fluoroscopy and device exchange times, decreased sedation requirements, improved wire stability and increased endoscopist control of the wire. Furthermore,the physician-controlled wire-guided cannulation has the potential to decrease ampullary trauma and the rate of post-ERCP pancreatitis. The short guidewire systems appear to be an improvement over the traditional long-wire systems but further studies directly comparing the two approaches are needed.

  13. Role of ERCP in the era of laparoscopic cholecystectomy for the evaluation of choledocholithiasis in sickle cell anemia

    Institute of Scientific and Technical Information of China (English)

    Hussain Issa; Ahmed H Al-Salem

    2011-01-01

    AIM: To evaluate the role of endoscopic retrograde cholangiopancreatography (ERCP) for choledocholithiasis in patients with sickle cell anemia (SCA) in the era of laparoscopic cholecystectomy (LC).METHODS: Two hundred and twenty four patients (144 male, 80 female; mean age, 22.4 years; range, 5-70 years) with SCA underwent ERCP as part of their evaluation for cholestatic jaundice (CJ).The indications for ERCP were: CJ only in 97, CJ and dilated bile ducts on ultrasound in 103, and CJ and common bile duct (CBD) stones on ultrasound in 42.RESULTS: In total, CBD stones were found in 88 (39.3%) patients and there was evidence of recent stone passage in 16.Fifteen were post-LC patients.These had endoscopic sphincterotomy and stone extraction.The remaining 73 had endoscopic sphincterotomy and stone extraction followed by LC without an intraoperative cholangiogram.CONCLUSION: In patients with SCA and cholelithiasis, ERCP is valuable whether preoperative or postoperative, and in none was there a need to perform intraoperative cholangiography.Sequential endoscopic sphincterotomy and stone extraction followed by LC is beneficial in these patients.Endoscopic sphincterotomy may also prove to be useful in these patients as it may prevent the future development of biliary sludge and bile duct stones.

  14. 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...

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

    Data.gov (United States)

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

  16. ERCP-the role of radiologist or what the endoscopist needs to know

    International Nuclear Information System (INIS)

    Endoscopic retrograde cholangiopancreatography (ERCP) is an interdisciplinary endoscopic-radiologic method for diagnosis and treatment of the diseases of the biliary and pancreatic ducts. The procedure requires an excellent technical experience and high professional qualification of the medical team. The cannulation of the papilla of Vater and the contrast imaging of the hepatobiliary tree and the pancreatic duct need co-operation between the radiologist and endoscopist for interpretation of the findings - malignant or benign stenosis, choledocholithiasis, iatrogenic lesions. The undertaken endoscopic therapeutic procedures are performed under fluoroscopic guidance as well as the subsequent assessment of their effective - stone extraction, stent placement, etc. The good collaboration of the team during each stage of the procedure can guarantee its success. (authors)

  17. Examination of cholangiogram of obstructive jaundice using MRI; Compared with PTC and ERCP

    Energy Technology Data Exchange (ETDEWEB)

    Nakagawa, Hiroshi; Okamura, Shouzo; Ohashi, Shinji; Mitake, Masahiro; Fujii, Yasuaki; Miyata, Takahiro; Satake, Koji; Matsui, Masumi (Toyohashi City Hospital, Aichi (Japan))

    1993-07-01

    PTC and ERCP are most often used in diagnosis of obstructive jaundice. We studied the possibility of clinical diagnosis using MRI in 33 cases of obstructive jaundice. A clinical diagnosis of malignant tumors could be given in 17 cases out of 20 (85%) using MRI if respiratory sandstill was possible. An MRI cholangiogram was particularly effective in describing tearful parting bile ducts and was clearer than PTC in describing negative gallbladders. Choledochal stones could be diagnosed in 58% of cases, which was less than the rate for malignant tumors. MRI is not an invasive examination, can be used in diagnosis of obstructive jaundice, and helps in selecting treatment methods such as PTCD and ERBD. (author).

  18. Pancreatic duct guidewire placement for biliary cannulation in a single-session therapeutic ERCP

    Institute of Scientific and Technical Information of China (English)

    Dimitrios Xinopoulos; Stefanos P Bassioukas; Dimitrios Kypreos; Dimitrios Korkolis; Andreas Scorilas; Konstantinos Mavridis; Dimitrios Dimitroulopoulos; Emmanouil Paraskevas

    2011-01-01

    AIM: To investigate the technical success and clinical complication rate of a cannulated pancreatic duct with guidewire for biliary access.METHODS: During a five-year study period, a total of 2843 patients were included in this retrospective analysis. Initial biliary cannulation method consisted of single-guidewire technique (SGT) for up to 5 attempts, followed by double-guidewire technique (DGT) when repeated unintentional pancreatic duct cannulation had taken place. Pre-cut papillotomy technique was reserved for when DGT had failed or no pancreatic duct cannulation had been previously achieved. Main outcome measurements were defined as biliary cannu-lation success and post-endoscopic retrograde cholan-giopancreatography (ERCP) complication rate.RESULTS: SGT (92.3% success rate) was character-ized by statistically significant enhanced patient out-come compared to either the DGT (43.8%, P < 0.001), pre-cut failed DGT (73%, P < 0.001) or pre-cut as first step method (80.6%, P = 0.002). Pre-cut as first step method offered a statistically significantly more favor-able outcome compared to the DGT (P < 0.001). The incidence of post-ERCP pancreatitis did not differ in a statistically significant manner between either method (SGT: 5.3%, DGT: 6.1%, Pre-cut failed DGT: 7.9%, Pre-cut as first step: 7.5%) or with patients' gender. CONCLUSION: Although DGT success rate proved not to be superior to SGT or pre-cut papillotomy, it is con-sidered highly satisfactory in terms of safety in order to avoid the risk of a pre-cut when biliary therapy is neces-sary in difficult-to-cannulate cases.

  19. BLOCKING SUN WITH ORBITING BALLOONS

    Energy Technology Data Exchange (ETDEWEB)

    Chul Park [Department of Aerospace Engineering, Kor ea Advanced Institute of Science and Technology, Daejeon (Korea)

    2008-09-30

    Sun's radiation power reaching Earth's surface can be reduced by letting large balloons circle the Earth in orbits at approximately 1000 km altitude. These balloons, made of plastic films 1 mm in thickness, of a diameter of approximately 46 km, will weigh about 10,000 tons each. A balloon will consist of one hundred of 100 ton pieces. They are transported to the orbit piece by piece, and are assembled there into the spherical shape. They are kept inflated with the vapor pressure of potassium and the electrostatic forces. The inclination angles of these balloons with respect to the solar ecliptic plane can be varied from zero to 90 degrees, although efficiency is highest with the zero degree inclination. If zero degree inclination is chosen, twenty-three of these will reduce the average sun's radiation by 0.01%. In the 1000 km orbits, which are stable and are populated only by space debris, these balloons will serve also to remove the debris.

  20. 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...

  1. Pre-Study protocol MagPEP: a multicentre randomized controlled trial of magnesium sulphate in the prevention of post-ERCP pancreatitis

    OpenAIRE

    Fluhr, Gabriele; Mayerle, Julia; Weber, Eckhard; Aghdassi, Ali; Simon, Peter; Gress, Thomas; Seufferlein, Thomas; Mössner, Joachim; Stallmach, Andreas; Rösch, Thomas; Müller, Martina; Siegmund, Britta; Büchner-Steudel, Petra; Zuber-Jerger, Ina; Kantowski, Marcus

    2013-01-01

    Background Acute pancreatitis is the most common complication of diagnostic and therapeutic endoscopic retrograde cholangiopancreatography (ERCP). In spite of continuing research, no pharmacologic agent capable of effectively reducing the incidence of ERCP-induced pancreatitis has found its way into clinical practise. A number of experimental studies suggest that intrapancreatic calcium concentrations play an important role in the initiation of intracellular protease activation, an initiating...

  2. 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.

  3. 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.

  4. 腔内隧道式电切疏通在内镜治疗胆管重度狭窄中的应用%Intra-biliary tunnel electro-resection and aspiration approach during ERCP for severe biliary stricture

    Institute of Scientific and Technical Information of China (English)

    张炳印; 庞勇; 白文涛; 刘丹青

    2012-01-01

    Objective To evaluate intra-biliary tunnel electro-resection and aspiration approach during ERCP for severe biliary stricture.Methods A total of 14 patients with severe benign or malignant biliary stricture,which failed in previous ERCP,were recruited. First the guide wire was passed gently through the narrow segment under fluoroscopy,then the double-lumen needle knife was placed near the stricture and wire cutter was protruded.The tunnel electro-resection and aspiration was performed along the guide wire until the narrow segment could be passed through under fluoroscopy by the expanding balloon dilator for the following procedures.Results Of 14 patients with severe biliary strictnres,electro-resection and aspiration procedure were successful in 12 (85.7%).Metal stents were implanted in all 7 patients with malignant biliary strictures.Plastic stents were placed after balloon dilatation in 5 patients with benign stenosis.Three out of 5 patients received double plastic stents,while the two others only needed a single plastic stent.The procedure was failed in 2 patients ( 14.3% ) with malignant biliary strictures as hilar cholangiocarcinoma invaded the left and right hepatic duct,forming a right angle in biliary stenosis,so that needle knife could not go through,and the following procedure was aborted.There were no severe complications like massive bleeding,perforation or death observed.Conclusion The intra-biliary tunnel electro-resection and aspiration approach can significantly increase the success rate of ERCP in severe biliary strictures.%目的 探讨腔内隧道式电切疏通在ERCP治疗胆管重度狭窄患者中的应用价值.方法 对14例胆管良恶性重度狭窄只能勉强通过导丝而扩张导管等器械不能通过的ERCP治疗患者,将双腔针状切开刀沿导丝插至狭窄处并伸出刀丝,在X线监测下向前推进行腔内电切疏通,形成隧道至可通过扩张导管或柱状气囊以达到延续治疗的目的.结果 14

  5. 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

  6. ERCP for the treatment of bile leak after partial hepatectomy and fenestration for symptomatic polycystic liver disease

    Institute of Scientific and Technical Information of China (English)

    Nayantara Coelho-Prabhu; David M Nagorney; Todd H Baron

    2012-01-01

    AIM:TO describe endoscopic treatment of bile leaks in these patients and to identify risk factors in these patients which can predict the development of bile leaks.METHODS:Retrospective case-control study examining consecutive patients who underwent partial hepatectomy for polycystic liver disease (PLD) and developed a postoperative bile leak managed endoscopically over a ten year period.Each case was matched with two controls with PLD who did not develop a postoperative bile leak.RESULTS:Ten cases underwent partial hepatectomy with fenestration for symptoms including abdominal distention,pain and nausea.Endoscopic retrograde cholangiopancreatography (ERCP) showed anatomic abnormalities in 1 case.A biliary sphincterotomy was performed in 4 cases.A plastic biliary stent was placed with the proximal end at the site of the leak in 9 cases;in 1 case two stents were placed.The overall success rate of ERCP to manage the leak was 90%.There were no significant differences in age,gender,comorbidities,duration of symptoms,history of previous surgery or type of surgery performed between cases and controls.CONCLUSION:ERCP with stent placement is safe and effective for management of post-hepatectomy bile leak in patients with PLD.

  7. Peroxisome proliferator-activated receptor γ agonist reduces the severity of post-ERCP pancreatitis in rats

    Institute of Scientific and Technical Information of China (English)

    Emma Folch-Puy; Susana Granell; Juan L Iovanna; Marc Barthet; Daniel Closa

    2006-01-01

    AIM:To determine the effects of prophylactic peroxisome proliferator-activated receptor (PPARγ) agonist administration in an experimental model of postendoscopic retrograde cholangiopancreatography (postERCP) acute pancreatitis.METHODS: Post-ERCP pancreatitis was induced in male Wistar rats by infusion of contrast medium into the pancreatic duct. In additional group, rosiglitazone, a PPARγ agonist, was administered 1 h before infusion of contrast medium. Plasma and pancreas samples were obtained 6 h after the infusion.RESULTS: Infusion of contrast medium into the pancreatic duct resulted in an inflammatory process characterized by increased lipase levels in plasma, and edema and myeloperoxidase activity (MPO) in pancreas.This result correlated with the activation of nuclear factor κB (NFκB) and the inducible NO synthase (iNOS)expression in pancreatic cells. Rosiglitazone reduced the increase in lipase and the level of edema and the increase in myeloperoxidase as well as the activation of NFκB and iNOS expression.CONCLUSION: A single oral dose of rosiglitazone, given 1 h before post-ERCP pancreatitis induction is effective in reducing the severity of the subsequent inflammatory process. The protective effect of rosiglitazone was associated with NFκB inhibition and the blockage of leukocyte infiltration in pancreas.

  8. 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.

  9. Global electrodynamics from superpressure balloons

    Science.gov (United States)

    Holzworth, R. H.; Hu, H.

    1995-01-01

    Electric field and conductivity measurements in the stratosphere between November 1992 and March 1993 have been made using superpressure balloons in the southern hemisphere. Over 400 payload-days of data have been made during a record setting experiment called ELBBO (Extended Life Balloon Borne Observatories). This experiment resulted in 4 flights aloft simultaneously for over 2 months including one flight which lasted over 4 months. Electrodynamical coupling between the atmosphere and ionosphere is studied using the measured electric fields, and a simple empirical model of the stratospheric conductivity. Altitude profiles of conductivity have been obtained from several superpressure balloon flights using the large end-of-flight altitude swings on the last few days of each flight (as the balloon begins to loose superpressure). Coupling between the fields and atmospheric inertial waves has been observed. Effects and dynamics of the global circuit suggest that standard models are missing significant phenomena. Large scale ionospheric convection activity has been studied from the polar cap to the middle latitudes. Cusp latitude fields have been continuously measured for many days in a row.

  10. 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

  11. Antioxidant therapy in the management of acute, chronic and post-ERCP pancreatitis: A systematic review

    Institute of Scientific and Technical Information of China (English)

    Seyed Sajad Mohseni Salehi Monfared; Hamed Vahidi; Amir Hossein Abdolghaffari; Shekoufeh Nikfar; Mohammad Abdollahi

    2009-01-01

    We systematically reviewed the clinical trials which recruited antioxidants in the therapy of pancreatitis and evaluated whether antioxidants improve the outcome of patients with pancreatitis. Electronic bibliographic databases were searched for any studies which investigated the use of antioxidants in the management of acute pancreatitis (AP) or chronic pancreatitis (CP) and in the prevention of post-endoscopic retrograde cholangio-pancreatography (post-ERCP) pancreatitis (PEP) up to February 2009. Twenty-two randomized, placebo-controlled, clinical trials met our criteria and were included in the review. Except for a cocktail of antioxidants which showed improvement in outcomes in three different clinical trials, the results of the administration of other antioxidants in both AP and CP clinical trials were incongruent and heterogeneous. Furthermore, antioxidant therapy including allopurinol and N-acetylcysteine failed to prevent the onset of PEP in almost all trials. In conclusion, the present data do not support a benefit of antioxidant therapy alone or in combination with conventional therapy in the management of AP, CP or PEP. Further double blind, randomized, placebo-controlled clinical trials with large sample size need to be conducted.

  12. 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.

  13. A Mars 2011 Balloon Mission Trade Study

    Science.gov (United States)

    Smith, I.; Lew, T.; Perry, W.

    Mars Scouts are competitively selected PI-led missions to further Mars exploration in ways that satisfy NASA s overall objectives but are not currently in the planned line of missions The current 2006 Announcement of Opportunity AO for Mars Scouts has just closed The goal of this SwRI study was to develop a new balloon mission concept to where it could be credibly proposed for the AO The balloon system was defined in the study as consisting of two parts the balloon flight system BFS and the balloon deployment inflation system DIS The BFS includes the balloon envelope accessory hardware and gondola The balloon includes the envelope seams end fittings load core inflation tube diffusers payload tether shock attenuator and separation hardware The DIS includes the balloon container deployment hardware sequencer tankage gas and control hardware Trade studies were performed to better define the mission design space These studies included 1 effect of varied atmospheric thermal loads 2 effect of varying latitudes 3 effect of payload mass for varying altitudes 4 effect of radiative material properties on balloon size mass 5 effect of material areal densities on balloon size mass and 6 effect of inflation gas on system masses Results of the balloon trade study for the Mars 2011 mission opportunity will be presented

  14. 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.

  15. 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...

  16. 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.

  17. [ENDOSCOPIC RETROGRADE CHOLANGIO PANCREATOGRAPHY(ERCP): EXPERIENCE IN 902 PROCEDURES AT THE ENDOSCOPY DIGESTIVE CENTRE OF "ARZOBISPO LOAYZA" HOSPITAL

    Science.gov (United States)

    Vargas Cardenas, Gloria; Astete Benavides, Magdalena

    1997-01-01

    On 1997, the Digestive Endoscopy Centre of "Arzobispo Loayza" Hospital was created with the cooperation of JICA (Japan International Cooperation Agency). 902 ERCP were regularly performed from 1985 to August 1997. 902 tests were reviewed and 831 cases were left after excluding 16 ampulloma cases, 15 cannulated or insufficient cases and 40 cases dealing only with pancreatic duct cannulation. The population is examined according to sex, age and diagnosis, establishing a relation among these three variables. Results showed that most of ERCP were made to women (3:1) with Choledocal Lithiasis (C.L.) and cholecistectomy antecedents, a greater frequency was observed in 56-65 year old women. In males, it was more frequent in people older than 65 years, they also had predominance of choledocal lithiasis, but malignant neoplasia of the biliary duct ranked in the third place. The highest incidence of C.L. with cholecistectomy antecedents suggests the performance of an appropriate evaluation of the biliary duct before surgery. PMID:12177716

  18. Reevaluation of the balloon in gastrointestinal manometry.

    Science.gov (United States)

    Wilkes, P R; Hoskin, R W; Semlacher, E A; MacCannell, K L; Tyberg, J V

    1994-09-01

    Although the flow-through catheter (FTC) system has been useful and satisfactorily accurate for gastrointestinal manometry, we hypothesized that a cylindrical, liquid-filled balloon would also accurately reflect stress imposed by a sphincter. Latex balloons were fitted over the side ports of a closed-end catheter. The responses of the balloon and FTC system were compared in a cylindrical chamber commonly identified as a Starling resistor. Independent, constant-pressure sources were used to control both the inwardly directed "contact pressure" of the Starling resistor (Ps) and the intraluminal fluid pressure (P(lum)). The balloon transducers responded linearly and accurately (slope = 1) to changes in both Ps and P(lum) within the test range (0-200 mmHg, 0-26.7 kPa). When either P(lum) or Ps was held constant and the other changed, the balloon transducers always accurately measured the higher of the two pressures. Although the performance of the FTC system was improved after the Starling resistor was lubricated, the FTC system sometimes responded inaccurately to changes in Ps. The ability of the balloon transducers to measure the contractions of the lower esophageal sphincter and of the esophagus was demonstrated. We conclude that the balloon transducer can measure sphincter pressure accurately and suggest that, in certain circumstances, it might be advantageous relative to the FTC system. PMID:7842396

  19. 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.

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

    Science.gov (United States)

    Blumenthal, Jack; Bradvica, Rafaela; Karl, Katherine

    2013-01-01

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

  1. Investigating Diffusion and Entropy with Carbon Dioxide-Filled Balloons

    Science.gov (United States)

    Jadrich, James; Bruxvoort, Crystal

    2010-01-01

    Fill an ordinary latex balloon with helium gas and you know what to expect. Over the next day or two the volume will decrease noticeably as helium escapes from the balloon. So what happens when a latex balloon is filled with carbon dioxide gas? Surprisingly, carbon dioxide balloons deflate at rates as much as an order of magnitude faster than…

  2. 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 ...

  3. Cutting Balloon angioplasty for cardiac transplant vasculopathy.

    OpenAIRE

    Takano, Y.; Currier, JW; Yeatman, LA; Kobashigawa, JA; Rogers, AD; Cianfichi, LJ; Fishbein, MC; Tobis, JM

    2002-01-01

    We performed Cutting Balloon angioplasty on 20 lesions in 11 heart transplant recipients 7.5 +/- 3.8 years after transplantation. The mean percentage of diameter stenosis decreased from 88.3% +/- 13.8% to 19.6% +/- 13.7% after Cutting Balloon angioplasty without complication. Seven patients underwent follow-up angiography at 4.9 +/- 1.7 months in a total of 12 lesions, and all lesions showed restenosis with a mean diameter stenosis of 84.4% +/- 19.2%. Cutting Balloon angioplasty can be used t...

  4. The balloon and the airship technological heritage

    Science.gov (United States)

    Mayer, N. J.

    1981-01-01

    The balloon and the airship are discussed with emphasis on the identification of commonalities and distinctions. The aerostat technology behind the shape and structure of the vehicles is reviewed, including a discussion of structural weight, internal pressure, buckling, and the development of a stable tethered balloon system. Proper materials for the envelope are considered, taking elongation and stress into account, and flight operation and future developments are reviewed. Airships and tethered balloons which are designed to carry high operating pressure with low gas loss characteristics are found to share similar problems in low speed flight operations, while possessing interchangeable technologies.

  5. 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.

  6. Relationship between intraduodenal peri-ampullar y diver ticulum and biliar y disease in 178 patients undergoing ERCP

    Institute of Scientific and Technical Information of China (English)

    Shuo-Dong Wu; Yang Su; Ying Fan; Zhen-Hai Zhang; Hao-Lin Wang; Jing Kong; Yu Tian

    2007-01-01

    BACKGROUND:The presence of intraduodenal peri-ampullary diverticulum is often observed during upper digestive tract barium meal studies and endoscopic retrograde cholangiopancreatography (ERCP). A few papers in China and overseas reported that the diverticulum had something to do with the incidence of cholelithiasis. This study was undertaken to further test this notion and ascertain the relationship between intraduodenal peri-ampullary diverticulum and biliary disease, especially the formation of bile duct pigment stones. METHODS: A total of 178 patients who had undergone ERCP or endoscopic sphincterotomy (EST) were studied retrospectively. They were divided into 6 groups according to the category of biliary disease, and the incidence rates of intraduodenal peri-ampullary diverticulum were calculated. RESULTS:There were 44 patients with intraduodenal peri-ampullary diverticulum in 81 patients with primary bile duct pigment stones (54.32%), 4 in 8 patients with bile duct stones and gallbladder stones (50%), 7 in 33 patients with bile duct stones secondary to gallbladder stones (21.21%), 3 in 21 patients with inlfammation and stricture of the end of the bile duct and papilla (14.29%), 1 in 22 patients with carcinoma of the end of the bile duct and papilla (4.54%), and 5 in 13 patients with post-cholecystectomy syndrome or sphincter of Oddi dysfunction (38.46%). CONCLUSIONS:The incidence rate of intraduodenal peri-ampullary diverticulum in patients with primary bile duct pigment stones is higher than that in patients with bile duct stones secondary to gallbladder stones, patients with inlfammation and stricture of the end of the bile duct and papilla, and patients with carcinoma of the end of the bile duct and papilla. These ifndings indicate that the anatomical abnormalities and malfunction of the sphincter of Oddi play an important role in the formation of bile duct pigment stones.

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

    Science.gov (United States)

    Vasudevan, Rajagopalan

    2012-07-01

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

  8. 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....

  9. 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...

  10. 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.

  11. 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. ...

  12. 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...

  13. 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.

  14. Test ventilation with smoke, bubbles, and balloons

    Energy Technology Data Exchange (ETDEWEB)

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

    1987-01-01

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

  15. New stent delivery balloon: a technical note.

    Science.gov (United States)

    di Mario, C; Reimers, B; Reinhardt, R; Ferraro, M; Moussa, I; Colombo, A

    1997-12-01

    This study reports the first clinical application of a new noncompliant balloon composed of a middle polyurethane layer sandwiched between an inner layer of polyethylene terephtalate and an outer membrane that provides for consistent even expansion. With this balloon design, the very low compliance and high pressure resistance of polyethylene terephthalate are associated with the high elasticity of polyurethane, preventing balloon damage from stent crimping and expansion and allowing a firm embedding of the stent struts. Palmaz-Schatz stent implantation was successful in 33/35 stents (94%), and the two stents that could not be advanced up to the lesion were successfully withdrawn. High pressure expansion of the stent was obtained during deployment with no balloon ruptures at inflation pressures equal or lower than 16 atmospheres (atm). Accurate positioning of the stent was facilitated by the two markers at the balloon ends and by the optimal visualization after contrast injection, even with 6 Fr guiding catheters. This new delivery system maintains the advantages of hand-crimped stents on noncompliant balloons, reducing the risk of stent loss. PMID:9408637

  16. ERCP with double-channel endoscope for patients with Billroth-Ⅱ gastroenterostomy%双腔前视胃镜治疗毕Ⅱ式胃空肠吻合术后胆胰疾病的临床观察

    Institute of Scientific and Technical Information of China (English)

    姚炜; 黄永辉; 常虹; 黄雪彪; 李柯

    2014-01-01

    Objective To evaluate the therapeutic effect and safety of forward-viewing,doublechannel endoscope in the process of ERCP in patients with bile duct diseases after Billroth-Ⅱ gastroenterostomy.Methods ERCP was applied to 46 patients with bile duct diseases using forward-viewing,doublechannel endoscope.All patients had the history of Billroth-Ⅱ gastroenterostomy.The success rate of selective cannulation,complication rate and the outcome of all the patients were recorded.Results The procedure succeeded in 38 patients with a success rate of 82.6%,and failed in 8.Of all the failing cases,the afferent loop couldn't be accessed in 6,failure in biliary cannulation in 2.Of 38 successful cases,bile duct stones were successfully removed in 31,metal stents placed for malignant bile duct obstruction in 4,and endoscopic balloon dilation for benign common bile duct stricture in 3.All patients recovered without complications of perforation,delayed bleeding or pancreatitis.Conclusion For patients with history of Billroth-Ⅱgastroenterostomy,ERCP with forward-viewing,double-channel endoscope yields to a higher success rate and lower complication rate.%目的 评价使用双腔前视胃镜对毕Ⅱ式胃空肠吻合术后胆胰疾病患者进行经内镜逆行胰胆管造影术(ERCP)治疗的疗效及安全性.方法 回顾性总结46例使用双腔前视胃镜进行ERCP治疗的毕Ⅱ式胃空肠吻合术后胆胰疾病患者的临床资料,统计十二指肠乳头插管成功率、并发症发生情况和治疗情况.结果 十二指肠乳头插管成功率为82.6% (38/46),8例失败,其中6例因双腔前视胃镜无法进入输入袢找到十二指肠乳头而失败,2例因乳头插管困难而失败.38例插管成功者中,31例胆管结石者均成功取出结石,4例胆总管下端恶性梗阻者均成功置入胆管金属支架,3例十二指肠乳头良性狭窄者经气囊扩张后均成功置入鼻胆引流管;所有患者术后恢复良好,无一例发生出血

  17. Adverse events of ERCP at San José Hospital of Bogotá (Colombia) Eventos adversos de la CPRE en el Hospital de San José de Bogotá

    OpenAIRE

    A. Peñaloza-Ramírez; C. Leal-Buitrago; A Rodríguez-Hernández

    2009-01-01

    Endoscopic retrograde cholangiopancreatography (ERCP) has become the preferred treatment method for hepatobiliary and pancreatic disease. Despite technological progress this technique continues to account for the greatest morbidity and mortality caused by digestive endoscopic procedures. ERCP carries a risk of pancreatitis, perforation, hemorrhage, cholangitis and cardiopulmonary events occurring in upto 10% of patients in referral centers, implying a mortality of up to 1%, not including ther...

  18. Diagnostic yield of brush cytology for biliary stenosis during ERCP Rentabilidad diagnóstica de la citología por cepillado de las estenosis biliares durante la CPRE

    OpenAIRE

    R. Temiño López-Jurado; G. Cacho Acosta; M. Argüelles Pintos; G. Rodríguez Caravaca; J. L. Lledó Navarro; C. Fernández Rodríguez

    2009-01-01

    Aim: to evaluate the diagnostic yield of brush cytology for biliary strictures detected on ERCP when a systematic approach is used. Patients and methods: data on 62 consecutive patients with a biliary stricture on ERCP were collected. Cytological samples were processed immediately after brushing in the endoscopy room, and all were analyzed by the same pathologist. For the statistical analysis specimens were classified as positive, negative, suspicious for malignancy (presence of atypias), and...

  19. The French Balloon Program 2013 - 2017

    Science.gov (United States)

    Dubourg, Vincent; Vargas, André; Raizonville, Philippe

    2016-07-01

    With over 50 years' experience in the field, the French Centre National d'Etudes Spatiales (CNES) goes on supporting - as designer and operator - a significant scientific ballooning program. In particular so because balloons still give a unique and valuable access to near space science. From 2008 to 2013, an important renovation effort was achieved, beginning by Zero Pressure Balloons (ZPB) systems, to comply with more stringent Safety constraints and to the growing reliability and performance requirements from scientific missions. The paper will give an overview of the CNES new capabilities and services for operational balloon activities, and their availability status. The scientific launch campaigns of the past two years will be presented. A focus will be made on the results of the Stratoscience 2015 flight campaign from Timmins, Ontario, using the NOSYCA command and control system for ZPB, qualified in flight in 2013. In particular, the PILOT telescope successfully flew during the 2015 campaign, key figures about the flight and mission will be given. An outlook of the new stratospheric long duration flight systems currently in process of developement at CNES will be given, as well as the presentation of the Stratéole 2 project, dedicated to the survey of the low stratosphere and upper troposphere in equatorial regions, with a fleet of small suprer pressure balloons (SPB). As far as tropospheric balloons are concerned, the Aeroclipper initiative will be presented, aiming at qualifying a quasi-tethered balloon, pushed by the winds close to the sea surface, for the study of cyclones. The scientific launch campaigns and the main payloads in the study for the near future will also be presented.

  20. Ballooning mode instability at the plasmapause

    Science.gov (United States)

    Lakhina, G. S.; Mond, M.; Hameiri, E.

    1990-01-01

    The ballooning mode instability, which can excite hydromagnetic waves at the plasmapause, is studied in the presence of azimuthal plasma flows induced during geomagnetically disturbed periods. A general sufficient criterion for the ballooning mode stability is derived, for a change in the potential energy greater than or equal to 0, which involves the integration over an entire field line. A local stability analysis at the equatorial plasmapause region shows that the ballooning modes could be spontaneously generated via instability under at least two conditions: one is similar to the usual interchange condition, and the second to the quasi-interchange modes. Both of these local instability conditions can be derived from the general stability criterion. Finally an exact solution for the equilibrium state with flow is derived analytically, and the change in the potential energy is computed numerically. It is found that, in the cases studied, the flow does not spontaneously excite the ballooning modes; it only further stabilizes (or destabilizes) the ballooning spectrum if originally the system is stable (or unstable). The analysis would be useful for the interpretation of some of the low-frequency modes observed at the ground and near the equatorial plasmapause.

  1. Clinical Evaluation of ERCP and Naobiliary Drainage for Biliary Fungal Infection--A Report of Five Cases of Severe Combined Bacterial and Fungal Infection of Biliary Tract

    Institute of Scientific and Technical Information of China (English)

    ZHAO Qiu; LIAO Jiazhi; QIN Hua; WANG Jialong

    2005-01-01

    This study studied the use of ERCP and nasobiliary tube in the diagnosis of fungal infection of biliary tract and the efficacy of combined use of local administration via nasobiliary tube and intravenous antifungal treatment for severe biliary tract fungal infection. 5 patients in our series,with age ranging from 47 to 68 y (mean 55.8), were diagnosed as having mixed bacterial and fungal infection of biliary tract as confirmed by smear or/and culture of bile obtained by ERCP and nasobiliary drainage. Besides routine anti-bacteria therapy, all patients received local application of fluconazole through nasobiliary tube and intravenous administration of fluconazole or itraconazole in terms of the results of in vitro sensitivity test. The mean duration of intravenous fluconazole or itraconazole was 30 days (24-40 days), and that of local application of fluconazole through nasobiliary drainage tube was 19 days (8-24 days). During a follow-up period of 3-42 months, all patient's fungal infection of biliary tract was cured. It is concluded that on the basis of typical clinical features of biliary tract infection, fungal detection of smear/culture of bile obtained by ERCP was the key for the diagnosis of fungal infection of biliary tract. Local application antifungal drug combined with intravenous anti-fungal drugs might be an effective and safe treatment for fungal infection of biliary tract.

  2. 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.

  3. 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...... York in Donald Barthelme's short story  "The Balloon" from 1968 is discussed in the light of the chapter's epistemological understanding of fantasy....

  4. 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.

  5. 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.

  6. 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.

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

    International Nuclear Information System (INIS)

    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. 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...

  9. 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…

  10. Increased Production of Sonic Hedgehog by Ballooned Hepatocytes

    OpenAIRE

    Rangwala, Fatima; Cynthia D Guy; Lu, Jiuyi; SUZUKI, Ayako; Burchette, James L.; Abdelmalek, Manal F; Chen, Wei; Diehl, Anna Mae

    2011-01-01

    Ballooned hepatocytes distinguish nonalcoholic steatohepatitis (NASH) from steatosis. Such cells contain dilated endoplasmic reticulum and ubiquitin aggregates, characteristics of endoplasmic reticulum stress. Hepatocyte ballooning increases risk for fibrosis in NASH, suggesting ballooned hepatocytes release pro-fibrogenic factors. Hedgehog ligands function as pro-fibrogenic factors in liver diseases, but mechanisms for Hedgehog ligand production remain poorly understood. We evaluated the hyp...

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

    Science.gov (United States)

    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.

  12. Survey of balloon design problems and prospects for large super-pressure balloons in the next century

    Science.gov (United States)

    Yajima, Nobuyuki

    About a half century has passed since modern scientific ballooning started in the 1950's. All this while, size and payload capabilities of zero-pressure balloons have improved rapidly. On the other hand, a super-pressure balloon which can take the place of a conventional large zero-pressure balloon has not yet become operational. To investigate this problem, previous research on balloon design is surveyed. It is concluded that quite important design problems have been left unsolved. Problems occur when a load tape assembly is introduced to the natural shape balloon system. The author proposed a new balloon design concept, named 3-D gore design, at the last COSPAR held in Nagoya in 1998. This theory improves the conventional natural shape design concept for the balloon reinforced by load tapes. This new design concept enables enhancing the strength of a balloon dramatically. In addition, the strength does not depend on balloon size. This theory will accelerate the development of large super-pressure balloons which will play a leading role in scientific ballooning in the 21st century.

  13. Attitude determination for balloon-borne experiments

    Science.gov (United States)

    Gandilo, N. N.; Ade, P. A. R.; Amiri, M.; Angilè, 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.; Doré, 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.

    2014-07-01

    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. In the 2010 and 2012 BLASTPol flights from McMurdo Station, Antarctica, the system demonstrated an accuracy of < 5' rms in-flight, and < 5" rms post-flight.

  14. Treatment of tuberculous bronchostenosis: balloon bronchoplasty

    International Nuclear Information System (INIS)

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

  15. 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.

  16. Efficacy and safety of ERCP in a low-volume hospital Eficacia y seguridad de la CPRE en un hospital con bajo volumen

    Directory of Open Access Journals (Sweden)

    José María Riesco-López

    2013-02-01

    Full Text Available Background and aims: there is little scientific evidence on the outcomes of endoscopic retrograde cholangiopancreatography (ERCP performed in low-volume hospitals; however, in our country, it is growing up its implementation. The objectives of our study were to evaluate the efficacy and safety of this technique performed by two endoscopists with basic training in a center of this nature and analyze the learning curve in the first procedures. Patients and methods: single-center retrospective study of the first 200 ERCP performed in our hospital (analyzing the evolution between the first 100 and 100 following procedures, comparing them with the quality standards proposed in the literature. Results: from February 2009 to April 2011, we performed 200 ERCP in 169 patients, and the most common indications were: Choledocholithiasis (77 %, tumors (14.5 % and other conditions (8.5 %. The cannulation rate rose from 85 % in the first 100 ERCP to 89 % in the next 100 procedures, clinical success from 81 % to 87 %, decreasing the post-ERCP acute pancreatitis rate from 11 % to 4 %, upper gastrointestinal bleeding (UGIB from 3 % to 2 % and acute cholangitis from 4 % to 1 %. There was a death from a massive UGIB in a cirrhotic patient in the first group of patients and a case of biliary perforation resolved by surgery in the second one. Conclusions: the results obtained after performing 200 procedures support the ability to practice ERCP in low-volume hospitals obtaining levels of efficacy and safety in accordance with published quality standards.Introducción y objetivos: existe poca evidencia científica sobre los resultados de la CPRE realizada en hospitales con bajo volumen, sin embargo su puesta en marcha en nuestro medio es creciente. Los objetivos de nuestro estudio son evaluar la eficacia y seguridad de dicha técnica realizada por dos endoscopistas biliares noveles en un centro de estas características y analizar la curva de aprendizaje en los

  17. Glyceryl trinitrate for prevention of post-ERCP pancreatitis and improve the rate of cannulation: a meta-analysis of prospective, randomized, controlled trials.

    Directory of Open Access Journals (Sweden)

    Jiexia Ding

    Full Text Available BACKGROUND: Acute pancreatitis is the most common complication of diagnostic and therapeutic endoscopic retrograde cholangiopancreatography (ERCP. Several clinical trials used glyceryl trinitrate (GTN to prevent the incidence of post-ERCP pancreatitis (PEP. However, the results were still controversial. OBJECTIVE: To conduct a meta-analysis of published, full-length, randomized controlled trials evaluating the effect of prophylactic GTN on the prevention of PEP, improve the rate of cannulation and the prevention of hyperamylasemia. METHODS: Literature searches were conducted using PubMed, EMBASE, The Cochrane Library and Web of Knowledge databases, using keywords "post-ERCP" and "pancreatitis" and limited in randomized controlled trials. RESULTS: Twelve RCTs involving 2649 patients were included. Eleven RCTs compared GTN with placebo for PEP prevention. Meta-analysis showed the overall incidence of PEP was significantly reduced by GTN treatment (RR 0.67; 95% CI, 0.52-0.87. Nevertheless, GTN administration did not decrease the incidence of moderate to severe PEP (RR 0.70; 95% CI, 0.42-1.15. Subgroup analyses revealed that GTN administered by sublingual was more effective than transdermal and topical in reducing the incidence of PEP. Besides, the prophylactic effect of GTN was far more obvious in the group of high PEP incidence than in the group of low PEP incidence. Additionally, the incidence of hyperamylasemia was significantly reduced by GTN treatment (RR 0.69; 95% CI, 0.54-0.90. No differences of the successful cannulation rate of bile ducts (RR 1.03; 95% CI, 0.99-1.06 attributable to GTN were observed. CONCLUSION: Prophylactic use of GTN reduced the overall incidence of PEP and hyperamylasemia. However, GTN was not helpful for the severity of PEP and the rate of cannulation.

  18. Clinical value of serum amylase, serum trypsinogen-2, IL-10 and platelet activating factor detection in diagnosis of post-ERCP pancreatitis

    Institute of Scientific and Technical Information of China (English)

    Di Wang; Xue-Song Li; Peng-Peng Cai

    2016-01-01

    Objective:To explore the clinical value of serum amylase, serum trypsinogen-2, IL-10 and platelet activating factor detection in the diagnosis of post-ERCP pancreatitis.Methods:A total of 256 patients with ERCP were selected in our hospital of the digestive department of internal medicine from January 2015 to December 2015. According to different symptoms, signs, serum amylase and pancreatic CT examination results after ERCP, the subjects were divided into three groups: control group, hyperlipidemia group and PEP group. Serum trypsinogen-2, IL-10, platelet activating factor were detected.Results:There were statistically significant differences in serum trypsinogen-2, IL-10, platelet activating factor among control group, hyperlipidemia group and PEP group patients with serum amylase (Fgroup = 269.578, 139.492, 145.637, 126.891, allP = 0.000), and the value of PEP group was the highest. There were statistically significant differences in serum trypsinogen-2, IL-10, platelet activating factor at different time point (Ftime = 602.506, 494.375, 462.512, 239.564, allP = 0.000), the serum amylase level in the patients with hyperlipidemia group reached the highest value after 4 h, but the 24 h was lower than the normal level after operation, the serum amylase in PEP group increased rapidly after 4 h, and the 24 h was still increased after operation; The serum trypsinogen-2, IL-10, platelet activating factor were all highest 4 h after the operation in the hyperlipidemia group and PEP group, and the 24 h after the operation were all decreased. In PEP group, serum amylase, serum trypsinogen-2, IL-10, platelet activating factor 4 h after the operation and 24 h after the operation were significantly higher than those before operation (Finteractive = 28.492, 22.614, 16.573, 7.819, allP = 0.000). In PEP group, the serum amylase had positive correlations with serum trypsinogen-2, IL-10, platelet activating factor (r=0.591, 0.662, 0.681, allP<0.05).Conclusions: Serum amylase

  19. 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.

  20. Pneumothorax, music and balloons: A case series

    OpenAIRE

    2013-01-01

    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 ...

  1. Coronary artery dissection by an oversized balloon.

    Science.gov (United States)

    Yafi, Wael; Jacquemin, Laurent

    2014-01-01

    Percutaneous coronary intervention (PCI) as a treatment of coronary artery disease can be a simple, rapid procedure with a clear benefit for the patient, but it could also become a complex procedure with fatal consequences. These complications depend on the lesion itself, material used and also on operating staff. In this case we report a coronary artery dissection of the circumflex (CX) artery caused by inflation of an oversized balloon. We discuss here the management and evolution of this complication. PMID:25479753

  2. 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...

  3. 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.

  4. Lightweight Reusable Solar Array For Balloons

    Science.gov (United States)

    Aaron, K.; Tensor, P.; Nock, K.; Wyszkowski, C.

    We will discuss a new lightweight reusable solar array system, dubbed HighPower, which is being developed for the Ultra-Long Duration Balloon (ULDB) program using NASA/SBIR funding, but which is also applicable to other balloon systems. The system uses a vertically deployed stack of panels suspended from their corners by cables. The stack act likes a two-dimensional Venetian blind. By raising and lowering opposite corners, the array of parallel panels can be pointed over most of the upper hemisphere. This allows the panels to remain normal to the sun despite the slow rotation of the gondola and without requiring rotation of the system (no slip rings) or heavy cantilevered rotation joints. The system is sized to generate 2000 W using six 2m x 2m panels. The modularity of the system allows panels to be added or removed to tailored the power to the needs of the mission. Prior to cut -down of the balloon, the panels can be retracted and stowed compactly in the lower part of the gondola. This will protect the array during landing, allowing the array to be reused on subsequent flights.

  5. Evaluation of staff, patient and foetal radiation doses due to endoscopic retrograde cholangio-pancreatography (ERCP) procedures in a pregnant patient

    International Nuclear Information System (INIS)

    The use of endoscopic retrograde cholangio-pancreatography (ERCP) in pregnant patients is not rare. Most studies on the safety and efficacy of these procedures report short- and long-term pregnancy outcomes and but not foetal absorbed doses. This investigation reports on an ERCP procedure for a 40-y-old woman who was 32-34 weeks pregnant. Thermoluminescent dosemeters (TLD 100) were used to measure doses received by the patient and the staff. Additionally, Monte Carlo calculations were performed using a 3D computational phantom representing a 9-month pregnant patient to estimate the foetal absorbed dose. The results show that the spleen of the mother received the largest absorbed dose of 12.18 mGy since it was closer to the source than other internal organs. For the foetus and uterus, the lowest absorbed dose was found to be 0.01 mGy to the foetal brain, while the largest absorbed dose was estimated to be 0.13 mGy to the placenta. (authors)

  6. Fluoroscopically Guided Balloon Dilation for Postintubation Tracheal Stenosis

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Woong Hee; Kim, Jin Hyoung, E-mail: m1fenew@daum.net; Park, Jung-Hun [University of Ulsan College of Medicine, Department of Radiology and Research Institute of Radiology, Asan Medical Center (Korea, Republic of)

    2013-10-15

    Purpose: Little was known about the safety and long-term efficacy of fluoroscopically guided balloon dilation for postintubation tracheal stenosis. The purpose of this study was to evaluate the safety and long-term efficacy of fluoroscopically guided balloon dilation in patients with postintubation tracheal stenosis. Methods: From February 2000 to November 2010, 14 patients underwent fluoroscopically guided balloon dilation for postintubation tracheal stenosis. Technical success, clinical success, and complications were evaluated. Patients were followed up for recurrent symptoms. Results: In all patients, fluoroscopically guided balloon dilation was technically and clinically successful with no major complications. Following the initial procedure, six patients (43 %) remained asymptomatic during a follow-up period. Obstructive symptoms recurred in eight patients (57 %) within 6 months (mean, 1.7 months), who were treated with repeat balloon dilation (n = 4) and other therapies. Of the four patients who underwent repeat balloon dilation, three became asymptomatic. One patient became asymptomatic after a third balloon dilation. On long-term (mean, 74 months) follow-up, 71 % of patients experienced relief of symptoms following fluoroscopically guided balloon dilation. Conclusions: Fluoroscopically guided balloon dilation may be safe, is easy to perform, and resulted in effective treatment in patients with postintubation tracheal stenosis.

  7. Acoustical characterization of exploding hydrogen-oxygen balloons.

    Science.gov (United States)

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

    2012-03-01

    Exploding hydrogen-oxygen balloons are popular chemistry demonstrations. Although initial research experimentally quantified potential hearing risk via analysis of peak levels [K. L. Gee et al., J. Chem. Educ. 87, 1039-1044 (2010)], further waveform and spectral analyses have been conducted to more fully characterize these impulsive noise sources. While hydrogen-only balloons produce inconsistent reactions and relatively low, variable levels, stoichiometrically mixed hydrogen-oxygen balloons produce consistent high-amplitude noise waveforms. Preliminary consideration is also given to the potential use of these exploding balloons in architectural acoustics applications. PMID:22423815

  8. Safety and efficacy of large balloon sphincteroplasty in a third care hospital Dilatación con balón asociada a esfinterotomía, evaluación de eficacia y seguridad en un hospital terciario

    Directory of Open Access Journals (Sweden)

    Eduardo Martín-Arranz

    2012-07-01

    Full Text Available Background and aims: large balloon sphincteroplasty (LBS associated with sphincterotomy (ES has gained acceptance as a useful tool in extracting difficult bile duct stones. Our purpose was to evaluate the efficacy and safety of LBS with balloons ≥ 10 mm in clinical practice setting. Patients and methods: unicentre prospective study in a tertiary care hospital. All patients who underwent LBS associated with ES between July 2007 and March 2011 were included prospectively in a database recording clinical aspects, procedure data, outcome and complications. Success is the main outcome defined as complete stone removal documented by absence of any filling defect during a final occlusion cholangiogram and absence of clinical or radiological findings after the ERCP consistent with remaining stones. Complications as pancreatitis, cholangitis, post-ERCP bleeding, perforation and others were also measured. Results: one hundred twenty procedures were made in 109 patients with balloons ranging from 10 to 20 mm. Success rate was 91% in the first attempt and 96.7% after two procedures. Mechanical lithotripsy was only needed in one case (0.8%. Complication rate was 4.2% due to five cases of post-ERCP bleeding in high risk patients. Conclusion: large balloon sphincteroplasty associated to sphincterotomy in clinical practice is a very effective and safe technique.Introducción y objetivos: la dilatación con balón de gran tamaño asociada a esfinterotomía es un recurso cada vez más utilizado en la extracción de coledocolitiasis de gran tamaño. El objetivo de este estudio es evaluar la eficacia y seguridad de la dilatación con balones mayores de 10 mm en un entorno de práctica clínica habitual. Pacientes y métodos: estudio prospectivo en un hospital terciario. Todos los pacientes en los que se realizó dilatación con balón mayor de 10 mm asociado a esfinterotomía entre julio de 2007 y marzo de 2011 se incluyeron prospectivamente en una base de datos

  9. 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

  10. 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.

  11. Guidelines and Suggestions for Balloon Gondola Design

    Science.gov (United States)

    Franco, Hugo

    2016-01-01

    The Columbia Scientific Balloon Facility is responsible for ensuring that science payloads meet the appropriate design requirements. The ultimate goal is to ensure that payloads stay within the allowable launch limits as well as survive the termination event. The purpose of this presentation is to provide some general guidelines for Gondola Design. These include rules and reasons on why CSBF has a certain preference and location for certain components within the gondola as well as other suggestions. Additionally, some recommendations are given on how to avoid common pitfalls.

  12. General theory of kinetic ballooning modes

    International Nuclear Information System (INIS)

    The ballooning mode formalism, previously developed for the ideal MHD problem, is applied here to the kinetic problem in tokamaks. The general two-dimensional equation governing drift and trapped-electron eigenmodes reduces to a one-dimensional integral equation along the lines of force with the radial structure determined by a WKB procedure. Comparisons made between the present one-dimensional code and a previous two-dimensional code embodying identical physical assumptions indicate reasonable agreement. This correspondence holds both for the structure along the field line and for the radial structure in the special case of closely spaced turning points

  13. 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.

  14. 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? PMID:27543477

  15. 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.

  16. Double-balloon endoscopy: Who needs it?

    DEFF Research Database (Denmark)

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

    2008-01-01

    Objective. Double-balloon endoscopy (DBE) made the small bowel accessible to inspection and therapy in its entirety. However, DBE is a time-consuming procedure that requires a highly skilled endoscopist, several nurses and - more often than not - anesthesiological support. This makes the selection...... of patients for DBE a pivotal point. The mainstay of this screening examination of the small bowel is capsule endoscopy (CE). The aim of this study was to describe the results of this screening procedure and the subsequent DBE in patients with suspected mid-gastrointestinal bleeding (MGIB). Material...

  17. Pneumothorax, music and balloons: A case series.

    Science.gov (United States)

    Dejene, Shiferaw; Ahmed, Fahim; Jack, Kastelik; Anthony, Arnorld

    2013-07-01

    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. PMID:23922614

  18. 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

  19. 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.

  20. 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...

  1. Recent developments in the scientific ballooning in India

    Science.gov (United States)

    Manchanda, R.; Sreenivasan, S.; Subbarao, J.; Kumar, P.

    RECENT DEVELOPMENTS IN THE SCIENTIFIC BALLOONING IN INDIA R. K. Manchanda1, S. Sreenivasan2, J. V. Subbarao2, P. R. Kumar2 1. Tata Institute of Fundamental Research Colaba, Mumbai-400 005, India. 2. TIFR Balloon Facility, PO Box 5, ECIL Post Office, Hyderabad-500 762, India ravi@tifr.res.in/FAX: +91-22-2152110 National Balloon facility operated by TIFR in Hyderabad, India is the only one of its kind in the world, which combines both, the in-house balloon production and a complete flight support for scientific ballooning. In the past few years we executed a major programme of upgradation of different components of balloon production, telemetry and telecommand hardware and various support facilities. This paper focuses on our increased capability of balloon production of large sizes up to 780,000 m3 using Antrix film, development of high strength balloon load tapes with the breaking strength of 182 kg, and the recent introduction of S-band telemetry and a commandable timer cut-off unit in the flight hardware. A summary of the various flights conducted in recent years and the results of the test flight conducted to qualify new sub systems will be presented.

  2. Application of therapeutic ERCP in patients 80 years of age and older%高龄患者进行治疗性逆行胆管造影的经验体会

    Institute of Scientific and Technical Information of China (English)

    邵晓冬; 郭晓钟; 任丽楠; 赵佳均; 梁振东; 林浩

    2013-01-01

    Objective To evaluate the efficacy and the safety of therapeutic ERCP in patients 80 years of age and older with biliary and pancreatic diseases. Methods Patients with biliary and pancreatic diseases treated with therapeutic ERCP in our hospital from December 2005 to December 2011 were retrospectively reviewed. Results Two hundred and thirty seven patients underwent 268 therapeutic ERCP procedures. The indications included choledocholithiasis( 53. 2% ), malignant obstructive jaundice( 20. 2% ), biliary pancreatitis ( 10. 5% ),acute suppurative cholangitis( 9. 7% ),benign biliary stricture( 3. 4% )and others( 3. 0% ). The success rate of therapeutic ERCP was 94. 9% and 14. 6% of all procedures were emergent. Bile duct stones were completely cleared in 95. 4% of patients with cho-ledocholithiasis. Four patients underwent ERBD and two patients were referred for surgical intervention due to unsuccessful clearance of bile duct stone. Metal biliary stents were inserted in 23 patients with malignant obstructive jaundice. Plastic biliary stents were inserted in 34 patients,of which 11 patients underwent stent replacement because of stent occlustion. Unsuccessful ERCP procedures occurred in 12 cases. There were 183( 77. 2% )patients with peripapillary diverticulum. Complications occurred in 6 patients including cholangitis( 2 cases ), pancreatitis( 1 case ), hemorrhage( 2 cases )and perforation( 1 case )and there was no death case in the group. Conclusion For patients 80 years of age and older with biliary and pancreatic diseases, therapeutic ERCP is an effective and safe treatment.%目的 评估在80岁以上高龄患者中经逆行胆管造影(ERCP)进行胆胰疾病治疗的疗效和安全性.方法 回顾性分析该院自2005年12月-2011年12月经ERCP进行胆胰疾病治疗的80岁以上高龄患者的病历资料.结果 237例80岁以上高龄患者共进行了268例次治疗性ERCP.患者行ERCP治疗的原因有:胆管结石(53.2%)、恶性梗阻性黄疸(20.2%)

  3. 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.

  4. Spectrum of the ballooning Schroedinger equation

    International Nuclear Information System (INIS)

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

  5. Intravascular ultrasound imaging following balloon angioplasty.

    Science.gov (United States)

    Tobis, J M; Mahon, D J; Moriuchi, M; Honye, J; McRae, M

    1991-01-01

    Despite its long history and reliability, contrast angiography has several inherent limitations. Because it is a two-dimensional projection image of the lumen contour, the wall thickness cannot be measured and the plaque itself is not visualized. This results in an underestimation of the amount of atherosclerotic disease by angiography. An assessment of atherosclerosis could be improved by an imaging modality: (1) that has an inherent larger magnification than angiography and (2) that directly visualizes the plaque. Intravascular ultrasound fulfils these criteria. This presentation will provide evidence that intravascular ultrasound may prove complimentary or even superior to angiography as an imaging modality. Intravascular ultrasound demonstrates excellent representations of lumen and plaque morphology of in vitro specimens compared with histology. There is very close intraobserver and interobserver variability of measurements made from intravascular ultrasound images. Phantom studies of stenoses in a tube model demonstrate that angiography can misrepresent the severity of stenosis when the lumen contour is irregular and not a typical ellipse, whereas intravascular ultrasound reproduces the cross-sectional morphology more accurately since it images the artery from within. In vitro studies of the atherosclerotic plaque tissue characteristics compare closely with the echo representation of fibrosis, calcification, and lipid material. In addition, in vitro studies of balloon angioplasty demonstrate that intravascular ultrasound accurately represents the changes in the structure of artery segments following balloon dilatation. PMID:1833473

  6. Balloon concepts for scientific investigation of Mars and Jupiter

    Science.gov (United States)

    Ash, R. L.

    1979-01-01

    Opportunities for scientific investigation of the atmospheric planets using buoyant balloons have been explored. Mars and Jupiter were considered in this study because design requirements at those planets bracket nominally the requirements at Venus, and plans are already underway for a joint Russian-French balloon system at Venus. Viking data has provided quantitative information for definition of specific balloon systems at Mars. Free flying balloons appear capable of providing valuable scientific support for more sophisticated Martian surface probes, but tethered and powered aerostats are not attractive. The Jovian environment is so extreme, hot atmosphere balloons may be the only scientific platforms capable of extended operations there. However, the estimated system mass and thermal energy required are very large.

  7. 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.

  8. 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.”

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

    International Nuclear Information System (INIS)

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

  10. 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.

  11. 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

  12. Risk Factors for Post-Endoscopic Retrograde Cholangiopancreatography (ERCP) Pancreatitis and Stent Dysfunction after Preoperative Biliary Drainage in Patients with Malignant Biliary Stricture.

    Science.gov (United States)

    Hashimoto, Shinichi; Ito, Kei; Koshida, Shinsuke; Kanno, Yoshihide; Ogawa, Takahisa; Masu, Kaori; Iwashita, Yuji; Horaguchi, Jun; Kobayashi, Go; Noda, Yutaka

    2016-01-01

    Objective To retrospectively evaluate the risk factors for post-endoscopic retrograde cholangiopancreatography (ERCP) pancreatitis (PEP) and stent dysfunction after performing preoperative biliary drainage (BD) in patients with malignant biliary stricture. Methods Between January 2003 and February 2013, 105 consecutive patients who had undergone transpapillary BD before surgery were enrolled in this study. Procedure-related complications, stent dysfunction rates, and their respective risk factors were investigated. PEP was defined according to the consensus guidelines. Results Fifty-five patients had bile duct cancer, 31 had pancreatic cancer, 16 had ampullary cancer, and 3 had gallbladder cancer. Endoscopic biliary stenting (EBS) and nasobiliary drainage (NBD) were performed in 84 patients and 21 patients, respectively. PEP occurred in 10% of the patients, with a significantly higher frequency in those with hilar/upper bile duct stricture (p=0.026) and a normal bilirubin level at admission (p=0.016). Of the 84 patients who underwent initial EBS, stent dysfunction occurred in 13%. The mean number of days from EBS to stent dysfunction was 14±12 days. A multivariate analysis revealed a male gender (p=0.048), a stent diameter ≤8 Fr (p=0.036), and an ERCP procedure time ≥45 minutes (p=0.021) to be risk factors for stent dysfunction. No NBD tube dysfunction was observed. Conclusion Patients with upper/hilar bile duct stricture or a normal bilirubin level are at high risk of developing PEP after preoperative BD. NBD or EBS with a large-bore stent is therefore recommended as preoperative BD. PMID:27629944

  13. Microgravity combustion experiment using high altitude balloon.

    Science.gov (United States)

    Kan, Yuji

    In JAXA, microgravity experiment system using a high altitude balloon was developed , for good microgravity environment and short turn-around time. In this publication, I give an account of themicrogravity experiment system and a combustion experiment to utilize the system. The balloon operated vehicle (BOV) as a microgravity experiment system was developed from 2004 to 2009. Features of the BOV are (1) BOV has double capsule structure. Outside-capsule and inside-capsule are kept the non-contact state by 3-axis drag-free control. (2) The payload is spherical shape and itsdiameter is about 300 mm. (3) Keep 10-4 G level microgravity environment for about 30 seconds However, BOV’s payload was small, and could not mount large experiment module. In this study, inherits the results of past, we established a new experimental system called “iBOV” in order toaccommodate larger payload. Features of the iBOV are (1) Drag-free control use for only vertical direction. (2) The payload is a cylindrical shape and its size is about 300 mm in diameter and 700 mm in height. (3) Keep 10-3-10-4 G level microgravity environment for about 30 seconds We have "Observation experiment of flame propagation behavior of the droplets column" as experiment using iBOV. This experiment is a theme that was selected first for technical demonstration of iBOV. We are conducting the flame propagation mechanism elucidation study of fuel droplets array was placed at regular intervals. We conducted a microgravity experiments using TEXUS rocket ESA and drop tower. For this microgravity combustion experiment using high altitude balloon, we use the Engineering Model (EM) for TEXUS rocket experiment. The EM (This payload) consists of combustion vessel, droplets supporter, droplets generator, fuel syringe, igniter, digital camera, high-speed camera. And, This payload was improved from the EM as follows. (1) Add a control unit. (2) Add inside batteries for control unit and heater of combustion

  14. Microcontroller uses in Long-Duration Ballooning

    Science.gov (United States)

    Jones, Joseph

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

  15. National Report France: The French Balloon Programme 2013-2016

    Science.gov (United States)

    Dubourg, V.; Vassaux, D.; Vargas, A.; Cocquerez, P.; Louvel, S.; Douchin, F.; Saccocio, M.; Mirc, F.

    2015-09-01

    With over 50 years' experience in the field, the French Centre National dEtudes Spatiales (CNES) goes on supporting a significant scientific ballooning program. In particular so because balloons still give a unique access to near space science. Over the past 6 years, most of the systems, beginning by the Zero Pressure Balloons, had to be renewed to comply with more stringent Safety constraints and to growing performance and reliability requirements from the scientific missions. This paper will give an overview of the CNES new capabilities and services for operational balloon activities, and their availability status. The scientific launch campaigns of the past two years will be presented. A focus will be made on the results of the Stratoscience 2014 flight campaign from Timmins, Ontario, using the NOSYCA command and control system for zero pressure balloons, qualified in 2013. The ChArMEx campaign (Chemistry-AeRosol Mediterranean Experiment) performed in 2013 from the Baleares islands and from the south of France, with Boundary Layer Pressurized Balloons will also be presented as well as the LOAC-VOLTAIRE experiment, carried out from Aire-sur-l'Adour (France), through the flights of 20 instrumented light expandable balloons. An outlook of the new stratospheric long duration flight systems currently studied at CNES will be given. The scientific launch campaigns and the main payloads in the study for the near future will also be presented.

  16. Graph-Based Path-Planning for Titan Balloons

    Science.gov (United States)

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

    2010-01-01

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

  17. Ballooning of CANDU pressure tubes. Model assessment

    International Nuclear Information System (INIS)

    The transient creep equations used to analyze the possible ballooning and failure of Zr-2.5% Nb pressure tubes during a loss-of-coolant accident (LOCA) were developed and verified using as-received Zr-2.5% Nb pressure tube material. But in a CANDU reactor, the pressure tubes absorb deuterium and are exposed to a continuous neutron fluence. Consequently, a literature survey was done to determine how irradiation damage and deuterium might affect the creep rate and ductility of Zr-2.5% Nb pressure tubes in the temperature range from 600 to 800 degrees C. It was found that irradiation damage, dissolved deuterium and deuteride blisters could possibly affect the creep rate and ductility of ZR-2.5% Nb pressure tubes in this temperature range, but deuteride platelets are expected to have little effect. Further tests are required to determine the effect of irradiation damage and deuterium on the creep rate and ductility of pressure tubes

  18. 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.

  19. 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'.

  20. Validation of IASI ozone profiles, using balloon sounding data

    OpenAIRE

    Delcloo, Andy; Hurtmans, Daniel; Coheur, Pierre-François; Clerbaux, Cathy

    2011-01-01

    Here we present a validation study of IASI vertical ozone profiles. This has been done using balloon ozone sonde data, which have a vertical resolution of about 100 m and measures ozone from the surface up to an altitude of about 30 km. IASI vertical ozone profiles are given as partial ozone columns [in DU per layer] between varying pressure levels. To validate the satellite derived ozone layers with the balloon ozone sounding data we integrate the ozone measured by the balloon ozone sounding...

  1. Balloon-dilatation of esophageal strictures in children

    Energy Technology Data Exchange (ETDEWEB)

    Johnsen, A.; Ingemann Jensen, L.; Mauritzen, K.

    1986-07-01

    Dilatation of benign esophageal strictures by means of a balloon-catheter is a well-established procedure in adults. This method is also useful in children. The technique is described and the results of treatment in 10 children are reported. In all our patients the stricture developed after an operation for esophageal atresia with an end-to-end anastomosis. Dilatation with a balloon-catheter seems to have the same or an even better effect than the traditional dilatation with bougies. Complications following balloon-dilatations have been few and negligible in this series and dilatations can be performed using sedation instead of general anaesthesia. Therefore, this method is recommended.

  2. Intragastric balloon for morbid obesity causing chronic gastric dilatation

    International Nuclear Information System (INIS)

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

  3. 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.

  4. 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)

  5. 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.)

  6. CLIMB: cosmic light isotopes and muons with balloons

    Energy Technology Data Exchange (ETDEWEB)

    Pearce, M. E-mail: pearce@particle.kth.se; Adriani, O.; Boezio, M.; Bonvicini, V.; Carlson, P.; Mocchiutti, E.; Papini, P.; Straulino, S.; Vacchi, A.; Vannuccini, E.; Zampa, G.; Zampa, N

    2004-06-01

    A new balloon-borne experiment is proposed which will measure high-energy light isotopes at the top of the Earth's atmosphere and cosmic ray muons at fixed altitudes within the Earth's atmosphere.

  7. 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.

  8. Current status of intragastric balloon for obesity treatment

    Science.gov (United States)

    Kim, Seung Han; Chun, Hoon Jai; Choi, Hyuk Soon; Kim, Eun Sun; Keum, Bora; Jeen, Yoon Tae

    2016-01-01

    Endoscopic bariatric therapy may be a useful alternative to pharmacological treatment for obesity, and it provides greater efficacy with lower risks than do conventional surgical procedures. Among the various endoscopic treatments for obesity, the intragastric balloon is associated with significant efficacy in body weight reduction and relief of comorbid disease symptoms. Anatomically, this treatment is based on gastric space-occupying effects that increase the feeling of satiety and may also affect gut neuroendocrine signaling. The simplicity of the intragastric balloon procedure may account for its widespread role in obesity treatment and its applicability to various degrees of obesity. However, advances in device properties and procedural techniques are still needed in order to improve its safety and cost-effectiveness. Furthermore, verification of the physiological outcomes of intragastric balloon treatment and the clinical predictive factors for treatment responses should be considered. In this article, we discuss the types, efficacy, safety, and future directions of intragastric balloon treatment. PMID:27350727

  9. 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...

  10. Proposed techniques for launching instrumented balloons into tornadoes

    Science.gov (United States)

    Grant, F. C.

    1971-01-01

    A method is proposed to introduce instrumented balloons into tornadoes by means of the radial pressure gradient, which supplies a buoyancy force driving to the center. Presented are analytical expressions, verified by computer calculations, which show the possibility of introducing instrumented balloons into tornadoes at or below the cloud base. The times required to reach the center are small enough that a large fraction of tornadoes are suitable for the technique. An experimental procedure is outlined in which a research airplane puts an instrumented, self-inflating balloon on the track ahead of the tornado. The uninflated balloon waits until the tornado closes to, typically, 750 meters; then it quickly inflates and spirals up and into the core, taking roughly 3 minutes. Since the drive to the center is automatically produced by the radial pressure gradient, a proper launch radius is the only guidance requirement.

  11. 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...

  12. Isothermal pumping analysis for high-altitude tethered balloons

    OpenAIRE

    Kuo, Kirsty A.; Hunt, Hugh E.M.

    2015-01-01

    High-altitude tethered balloons have potential applications in communications, surveillance, meteorological observations and climate engineering. To maintain balloon buoyancy, power fuel cells and perturb atmospheric conditions, fluids could be pumped from ground level to altitude using the tether as a hose. This paper examines the pumping requirements of such a delivery system. Cases considered include delivery of hydrogen, sulfur dioxide (SO2) and powders as fluid-based slurries. Isothermal...

  13. 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

  14. 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.

  15. 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.

  16. 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

  17. 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

  18. Alpha particle effects on MHD ballooning

    International Nuclear Information System (INIS)

    During the period, as the first step towards the goal of detail understanding of the effects of alpha particle on MHD Ballooning Modes, a new numerical approach to investigate the stability of low-frequency fluctuations in high temperature tokamaks was developed by solving the gyrokinetic equations for the ion and electron directly as an initial value problem. The advantage of this approach is the inclusion of many important kinetic features of the problem without approximations and computationally more economical than particle-pushing simulation. The ion-temperature-gradient-mode was investigated to benchmark this new simulation technique. Previous results in literature were recovered. Both the adiabatic electron model and the full drift-kinetic electron model are studied. Numerical result shows that the full drift-kinetic electron model is more unstable. The development of subcycling technique to handle the fast electron bounce time is particularly significant to apply this new approach to the alpha particle problem since alpha particle bounce frequency is also significantly higher than the mode frequency. This new numerical technique will be the basis of future study of the microstability in high temperature tokamaks with alpha particles (or any energetic species). 15 refs., 13 figs

  19. 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.

  20. 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.

  1. Post-ERCP pancreatogastric fistula associated with an intraductal papillary-mucinous neoplasm of the pancreas – a case report and literature review

    Directory of Open Access Journals (Sweden)

    Yasuda Yoshikazu

    2005-10-01

    Full Text Available Abstract Background Fistula formation has been reported in intraductal papillary-mucinous neoplasms (IPMNs with or without invasion of the adjacent organs. The presence or absence of invasion is mostly determined by postoperative histological examination rather than by preoperative work-up. Case presentation A 72 year-old Japanese woman showed remarkable dilatation of the main pancreatic duct (MPD in the distal region of the pancreas. Subsequent ERCP also showed MPD dilatation, after which the patient suffered moderate pancreatitis. A subsequent gastroscopy revealed a small ulceration that had not been observed in a gastroscopy performed 3 months prior. Mucinous discharge from the ulceration suggested it might be the orifice of a fistula connected to the MPD. En bloc resection including the distal region of the pancreas, spleen, stomach and part of the transverse colon was performed under the pre- and intraoperative diagnosis of an invasive malignant IPMN. However, histopathology revealed the lesion to be of "borderline malignancy" without apparent invasion of the stomach. Light microscopy showed inflammatory cellular infiltrates (mainly neutrophils around the pancreatogastric fistula, but there was no evidence of neoplastic epithelia lining the fistulous tract. Conclusion This case highlights that a pancreatogastric fistula can develop after acute inflammation of the pancreas in the absence of cancer invasion. Further information regarding IPMN-associated fistulae is necessary to clarify the pathogenesis, diagnosis, appropriate surgical intervention and prognosis for this disorder.

  2. ERCP在不明原因肝外阻塞性黄疸的临床应用%Clinical application of ERCP in the diagnosis of unexplained extrahepatic obstructive jaundice

    Institute of Scientific and Technical Information of China (English)

    高晓姣; 梁运啸; 农兵; 梁列新; 覃柳; 潘咏; 王彩英; 覃惠庆

    2012-01-01

    Objective To valuate the clinical application of endoscopic retrograde cholangiopancre-atography (ERCP) to the patients with unexplained extrahepatic obstructive jaundice after routine diagnostic approaches. Methods Forty-five patients consisting of 28 males and 17 females, aged 21 to 80 years old, enrolled for ERCP to determine the causes of pancreatic disease as well as extrahepatic bile duct obstruction which could not be figured out via ultrasonography, CT and/or MRCP. Results After ERCP, 42 of 45 patients were diagnosed as biliary tnicrolithiasis and were treated by endoscopic sphincterotomy (EST) technique to remove biliary microlithiasis. The patients with lower common bile tract were treated with endoscopic retrograde biliary drainage (ERBD). Together, all patients were rapidly relieved from abdominal pain and jaundice except two cases. One of them suffered from post-operative complication of mild pancreatitis but cured by conservative treatment, another one developed recurrent abdominal pain and then received cholecystectomy. Conclusion Our findings indicate that biliary microlithiasis is the main cause of unexplained extrahepatic obstructive jaundice. ERCP is a safe and reliable method for diagnosis and therapy of extrahepatic obstructive jaundice.%目的 探讨内镜逆行胰胆管造影(ERCP)在经常规检查不明原因肝外阻塞性黄疸的临床应用价值.方法 收集经B超、CT和/或MRCP检查诊断不明原因胆胰疾病或肝外胆管梗阻病人45例,男28例,女17例,年龄21~80岁,均行ERCP术.结果 45例病人行ERCP术,其中42例诊断为胆道微结石(Biliary microlithiasis,BML),42例均行乳头扩张术/EST+胆道取石术;3例为胆总管下端炎性狭窄而行胆道内支架植入术;1例ERCP取石术后并发轻症胰腺炎,经内科保守治疗后痊愈,1例因腹痛再发行胆囊切除术,其余患者经ERCP治疗后腹痛、黄疸均缓解.结论 BML是不明原因肝外阻塞性黄疸的主要原因,ERCP是不

  3. Determination of membrane tension during balloon distension of intestine.

    Science.gov (United States)

    Gregersen, H; Kassab, G S; Fung, Y C

    2004-09-01

    During the last decades, it has become increasingly common to make balloons distension in visceral organs in vivo. In particular this is true for studies of gastrointestinal motor function and biomechanics. Balloon distension is often used for assessment of small intestinal compliance and tension based on Laplace's law for cylindrical pressure pipes. This commonly used law is valid only when the balloon-distended intestine is cylindrical. Experimentally, it is seen that the diameter of the balloon-distended intestine is not a constant, but variable in the axial direction. Hence, it is necessary to improve Laplace's law for intestinal investigation. In this paper we develop the framework for determination of the tension distribution in circumferential and longitudinal direction during balloon distension. When the radii of curvature are measured from a photograph of the intestinal profile, then the membrane stress resultants can be computed everywhere in the intestine in contact with the balloon from the equations of equilibrium. The experimental data were obtained from small intestinal segments from five pigs and three guinea pigs. Papaverine was injected before the animals were sacrificed to relax the intestinal smooth muscle. The segments were immersed in a bath with calcium-free Krebs solution with dextran and EGTA. A balloon was distended in the lumen with pressures up to 15 cmH2O in the pigs and 10 cmH2O in the guinea pigs and radii were measured along the z-axis. The tension in circumferential direction had its maximum approximately 25% away from the middle of the balloon. The circumferential tension was 2-3 times higher than the longitudinal tension. In conclusion when we know the shape of the intestine, we can compute the circumferential and longitudinal components of tension. The large variation in tensions along the z axis must be considered when performing balloon distension studies in the gastrointestinal tract for studying physiological and

  4. 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...

  5. 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

  6. 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.

  7. Aerial Deployment and Inflation System for Mars Helium Balloons

    Science.gov (United States)

    Lachenmeler, Tim; Fairbrother, Debora; Shreves, Chris; Hall, Jeffery, L.; Kerzhanovich, Viktor V.; Pauken, Michael T.; Walsh, Gerald J.; White, Christopher V.

    2009-01-01

    A method is examined for safely deploying and inflating helium balloons for missions at Mars. The key for making it possible to deploy balloons that are light enough to be buoyant in the thin, Martian atmosphere is to mitigate the transient forces on the balloon that might tear it. A fully inflated Mars balloon has a diameter of 10 m, so it must be folded up for the trip to Mars, unfolded upon arrival, and then inflated with helium gas in the atmosphere. Safe entry into the Martian atmosphere requires the use of an aeroshell vehicle, which protects against severe heating and pressure loads associated with the hypersonic entry flight. Drag decelerates the aeroshell to supersonic speeds, then two parachutes deploy to slow the vehicle down to the needed safe speed of 25 to 35 m/s for balloon deployment. The parachute system descent dynamic pressure must be approximately 5 Pa or lower at an altitude of 4 km or more above the surface.

  8. 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.

  9. Development of Ultra-Thin Polyethylene Balloons for High Altitude Research upto Mesosphere

    Science.gov (United States)

    Kumar, B. Suneel; Nagendra, N.; Ojha, D. K.; Peter, G. Stalin; Vasudevan, R.; Anand, D.; Kulkarni, P. M.; Reddy, V. Anmi; Rao, T. V.; Sreenivasan, S.

    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 μm for fabrication of sounding balloons required for probing the stratosphere up to 42 km as the regular 2000-gram rubber balloon ascents could not reach altitudes higher than 38 km. By the year 1999, total indigenization of sounding balloon manufacture was accomplished. The work on balloon grade ultra-thin polyethylene film in thickness range 2.8 to 3.8 μm for fabrication of balloons capable of penetrating mesosphere to meet the needs of user scientists working in the area of atmospheric dynamics commenced in 2011. Pursuant to the successful trials with 61,000-m3 balloon made of 3.8-μm Antrix film reaching stratopause (48 km) for the first time in the history of balloon facility in the year 2012, fine tuning of launch parameters like percentage free lift was carried out to take the same volume balloons to higher mesospheric altitudes. Three successful flights with a total suspended load of 10 kg using 61,000-m3 balloons were carried out in the month of January 2014 and all the three balloons crossed into the mesosphere reaching altitudes of over 51 km. All the balloons flown so far are closed system with no escape ducts. Balloon fabrication, development of launch hardware, flight control instruments and launch technique for these mesospheric balloon flights are discussed in this paper.

  10. High-n ballooning modes in highly elongated tokamaks

    International Nuclear Information System (INIS)

    An analytic study of stability against high-n ballooning modes is highly elongated axisymmetric plasmas is presented and compared with computational results. - From the equation for the marginal pressure gradient, it is found that local shear has an important effect on the stability of elongated plasmas, and that stability deteriorates through high elongation since the stabilizing effects of field line bending and local shear are reduced. The net contribution of the local shear to stability decreases with elongation for strong ballooning modes (eigenfunctions strongly localized near the outer edge of the toroidal flux surfaces) but increases for interchange modes (eigenfunctions more uniform along the flux surfaces). - The computational study of high-n ballooning modes in a highly elongated plasma reveals that lowering the aspect ratio and broadening the pressure profile enhance the marginal beta for βsub(p) less than unity but severely reduce the marginal beta for βsub(p) larger than unity. (author)

  11. Extrusion process optimization for toughness in balloon films

    Science.gov (United States)

    Cantor, K. M.; Harrison, I. R.

    1993-01-01

    An experimental optimization process for blown film extrusion is described and examined in terms of the effects of the technique on the toughness of balloon films. The optimization technique by Cantor (1990) is employed which involves the identification of key process variables including screw speed, nip speed, bubble diameter, and frost-line height for analysis to optimize the merit function. The procedure is employed in the extrusion of a low-density polyethylene polymer, and the resulting optimized materials are toughness- and puncture-tested. Balloon toughness is optimized in the analytical relationship, and the process parameters are modified to attain optimal toughness. The film produced is shown to have an average toughness of 24.5 MPa which is a good value for this key property of balloon materials for high-altitude flights.

  12. 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.

  13. 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.

  14. 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.

  15. Drug-Coated Balloons for Infrainguinal Peripheral Artery Disease.

    Science.gov (United States)

    Sethi, Sanjum S; Lee, Michael S

    2016-07-01

    Revascularization of infrainguinal peripheral artery disease has traditionally been accomplished via percutaneous transluminal angioplasty. However, long-term results have been hampered by high rates of restenosis. Along with the advent of stents, paclitaxel-coated balloons are an emerging therapeutic option for the invasive management of infrainguinal peripheral artery disease. Paclitaxel has been successful in inhibiting neointimal hyperplasia, the main mechanism for in-stent restenosis. Technological advances have facilitated the development of paclitaxel-coated balloons, which show promise in early trials for femoropopliteal stenosis relative to uncoated balloons. For infrapopliteal stenoses, the data remain scant and conflicted. Therefore, large-scale randomized clinical trials with long-term follow-up evaluating safety and effectiveness between various strategies need to be performed to determine the optimal invasive management strategy for infrainguinal peripheral artery disease. PMID:27342205

  16. Dynamic electromechanical instability of a dielectric elastomer balloon

    Science.gov (United States)

    Chen, Feifei; Zhu, Jian; Wang, Michael Yu

    2015-11-01

    Electromechanical instability, a significant phenomenon in dielectric elastomers, has been well studied in the literature. However, most previous work was based on the assumption that dielectric elastomers undergo quasi-static deformation. This letter investigates the dynamic electromechanical instability of a dielectric elastomer balloon which renders four types of oscillation subject to a parametric combination of DC and AC voltages. The simulated oscillations show that dynamic electromechanical instability occurs within quite a large range of excitation frequency, in the form of snap-through or snap-back, when the DC and AC voltages reach critical values. The balloon is at its most susceptible to dynamic electromechanical instability when the superharmonic, harmonic or subharmonic resonance is excited. Taking all excitation parameters into account, this letter analyzes the global critical condition which triggers the dynamic electromechanical instability of the balloon.

  17. 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.

  18. Membranous duodenal stenosis: Initial experience with balloon dilatation in four children

    International Nuclear Information System (INIS)

    Introduction: We present a novel approach to the treatment of membranous duodenal stenosis (MDS). To our knowledge this is the first paper to describe balloon dilatation for this entity. Material and methods: Four children, 2 boys and 2 girls, aged between 8 and 28 days, underwent duodenal balloon dilatation. Balloon dilatation was performed under general anaesthesia using standard angiography balloons per os. Balloon diameters ranged from 6 to 14 mm. Results: All balloon dilatations were successful. None of the procedures showed procedural or post-procedural complications. None of the patients subsequently required surgical intervention. To date all children are doing well. Discussion: The initial experience with balloon dilation of MDS showed a 100% success rate, without procedural or post-procedural complications. The results obtained in this small group of patients suggest that the use of balloon dilatation in cases of MDS may be a safe technique that can be readily performed by an experienced interventional radiologist

  19. 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.

  20. 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.

  1. 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.

  2. BETTII: The Balloon Experimental Twin Telescope for Infrared Interferometry

    Science.gov (United States)

    Rinehart, Stephen

    2011-01-01

    Astronomical studies at infrared wavelengths have dramatically improved our understanding the universe. The relatively low angular resolution of these missions, however, is insufficient to resolve the physical scale on which mid-to far-infrared emission arises. We will build the Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII),8oeight-meter Michelson interferometer to fly on a high-altitude balloon. BETTII's spectral-spatial capability, provided by an instrument using double-Fourier techniques, will address key questions about the nature of disks io young star clusters and active galactic nuclei and the envelopes of evolved stars. BETTII will also lay the technological groundwork for future space interferometers.

  3. The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII)

    Science.gov (United States)

    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. BETTII uses a double-Fourier Michelson interferometer to simultaneously obtain spatial and spectral information on science targets; the long baseline provides subarcsecond angular resolution, a capability unmatched by other far-infrared facilities. Here, we present key aspects of the overall design of the mission and provide an overview of the current status of the project. We also discuss briefly the implications of this experiment for future space-based far-infrared interferometers.

  4. 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.

  5. 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

  6. Testing in a stratospheric balloon of a semiconductor detector altimeter

    International Nuclear Information System (INIS)

    An altimeter containing a semiconductor detector has been operated on flight. We have used a stratospheric balloon launched from AIRE-SUR-ADOUR with the C.N.E.S. collaboration. During this assay two apparatus have been used. The first allowed to follow the balloon during its ascension and descent, the second to follow its evolution at its maximum altitude. Informations transmitted by radio and recorded on Magnetophon, have been studied after the flight. Results are identical with these given by the barometer used by the C.N.E.S. in this essay. (authors)

  7. 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.

  8. Polymer blends for LDB applications. [Long Duration Ballooning

    Science.gov (United States)

    Lichkus, Andrew M.; Harrison, Ian R.

    1991-01-01

    A series of LCP/PE blends have been studied to determine the potential of such systems to produce a high modulus balloon film material which retains the balloon fabrication and low temperature flight advantages of the current PE films. Blown films of blends of 5 and 15 percent LCP in PE have been produced which show a 28 percent enhancement in modulus over the neat PE matrix. These results are substantially lower than anticipated and are explained in terms of the LCP reinforcement aspect ratio and fibril diameter.

  9. Long-term follow-up after embolization of pulmonary arteriovenous malformations with detachable silicone balloons

    DEFF Research Database (Denmark)

    Andersen, Poul Erik; Kjeldsen, Anette D

    2007-01-01

    ) with pulmonary angiography. Fifty-four percent of the balloons were deflated at latest radiographic chest film follow-up, but at pulmonary angiographic follow-up all embolized malformations were without flow irrespective of whether or not the balloons were visible. Detachable silicone balloons are not...

  10. Three dimensional intravascular ultrasonic assessment of the local mechanism of restenosis after balloon angioplasty

    NARCIS (Netherlands)

    M.A. Costa (Marco); P.J. de Feyter (Pim); K. Kozuma (Ken); A.L. Gaster; M. Sabaté (Manel); I.P. Kay (Ian Patrick); J.M.R. Ligthart (Jürgen); P. Thayssen; M.J.B.M. van den Brand (Marcel); P.W.J.C. Serruys (Patrick); D.P. Foley (David); W.J. van der Giessen (Wim)

    2001-01-01

    textabstractOBJECTIVE: To assess the mechanism of restenosis after balloon angioplasty. DESIGN: Prospective study. PATIENTS: 13 patients treated with balloon angioplasty. INTERVENTIONS: 111 coronary subsegments (2 mm each) were analysed after balloon angioplasty and at a six month follow up using th

  11. 丙谷胺对ERCP术后胰腺功能影响的评价%The Effect of Proglumide on Pancreatic Function of Post-ERCP

    Institute of Scientific and Technical Information of China (English)

    彭海峰; 郑通标; 龚时文; 闵军; 闫玉矿; 段君英

    2005-01-01

    目的探导丙谷胺对逆行胰胆管造影(ERCP)术后胰腺功能的影响.方法比较对照组(S组)、奥曲肽组(O组)、丙谷胺组(P组)急性胰腺炎的发生率、死亡率、血浆胆囊收缩素八肽(CCK-OP)及血清淀粉酶含量的变化.结果 S组并发急性胰腺炎3例(13.6%,3/22),O组并发急性胰腺炎1例(5%,1/20),P组并发急性胰腺炎1例(4.0%,1/25),S组明显高于O组及P组(P<0.05).术后6h及24h P组及O组血清淀粉酶与S组比较差异均有显著性(P<0.05), 但P组与O组比较差异无显著性(P>0.05).术后6h P组血浆CCK-OP 明显低于O组及S组,差异有显著性(P<0.05).术后24h P组与O组及S组比较差异均无显著性(P>0.05).结论丙谷胺可抑制CCK-OP的作用,与奥曲肽一样能有效地保护ERCP术后胰腺的功能,减轻酶血症,预防急性胰腺炎的发生.

  12. Adverse events of ERCP at San José Hospital of Bogotá (Colombia Eventos adversos de la CPRE en el Hospital de San José de Bogotá

    Directory of Open Access Journals (Sweden)

    A. Peñaloza-Ramírez

    2009-12-01

    Full Text Available Endoscopic retrograde cholangiopancreatography (ERCP has become the preferred treatment method for hepatobiliary and pancreatic disease. Despite technological progress this technique continues to account for the greatest morbidity and mortality caused by digestive endoscopic procedures. ERCP carries a risk of pancreatitis, perforation, hemorrhage, cholangitis and cardiopulmonary events occurring in upto 10% of patients in referral centers, implying a mortality of up to 1%, not including therapeutic failures or the need for re-intervention. A greater mortality rate has been demonstrated in prospective studies rather than in retrospective studies, but overall, the number of complications described in the literature is much lower than the number of complications that actually occur. A descriptive prospective study was conducted at San José Hospital from April 1, 2006 to April 30, 2007 in patients who underwent an ERCP and had a 1-month follow-up. A total of 381 patients were included; 9 (2.3% were excluded, and of the remaining 372 there was an overall success in 79.6% of cases, 8.3% had a second intervention, 7.6% developed complications (pancreatitis, perforation, hemorrhage, cholangitis, pain, intolerance to sedatives, and cardiopulmonary events, and 4.3% were failed ERCP studies. The mortality rate of the ERCP procedure was 0.8%. ERCP-related complications were determined at a teaching center, and this suggests the need to implement centers of excellence in order to improve the efficacy of the procedure.La colangiopancreatografía retrograda endoscópica (CPRE se ha convertido en el procedimiento terapéutico por excelencia de la vía biliopancreática. A pesar de los avances tecnológicos continúa siendo la técnica con mayor morbimortalidad de la endoscopia digestiva. Las complicaciones de la CPRE incluyen la pancreatitis, perforación, hemorragia, colangitis y eventos cardiopulmonares que en centros de referencia ocurren hasta en un 10

  13. Therapeutic ERCP strategies in patients with duodenum stricture%合并十二指肠狭窄患者实施经内镜逆行胰胆管造影术的策略

    Institute of Scientific and Technical Information of China (English)

    潘亚敏; 吴军; 王田田; 高道健; 胡冰

    2012-01-01

    目的 探讨合并十二指肠狭窄患者实施ERCP诊疗的方法与策略.方法 回顾性分析合并十二指肠狭窄患者的ERCP处理方法,观察内镜操作的成功率及并发症.结果 7276例接受ERCP的患者中,合并十二指肠狭窄158例(2.17%),其中恶性肿瘤浸润肠壁120例,十二指肠良性狭窄38例.采用改变体位或导丝引导的方法顺利通过狭窄处完成ERCP及胆道引流96例,实施柱状水囊扩张术后完成ERCP 33例,先放置十二指肠金属支架后行胆管引流4例,另有25例未能完成或放弃治疗.内镜操作成功率84.2% (133/158),术中有少量出血5例,未发生持续出血或穿孔等并发症.结论 十二指肠狭窄患者仍有可能完成ERCP操作,轻度狭窄可通过改变体位或导丝引导帮助内镜通过,重度狭窄需采用水囊扩张或先留置肠道支架,根据局部病变情况循序应用以上方法实施内镜治疗仍是安全的,且成功率较高.%Objective To investigate the methods and strategies of therapeutic ERCP in patients with duodenum stricture.Methods Endoscopic procedure,success rate and complications in patients with duodenum stricture who underwent ERCP were retrospectively analyzed.Results In 7276 patients who underwent therapeutic ERCP,duodenum stricture was found in 158 (2.17%),patients with malignant tumor infiltration in 120 and benign stricture in 38.The total success rate of ERCP and biliary drainage was 84.2%,with posture change or guidewire leading method in 96 patients,stylolitic water sac dilation in 33and duodenum metal stent placement before biliary drainage in 4.The procedure was failed in 25 patients.Minor bleeding occurred in 5 patients and no major complication including massive bleeding or perforation was observed.Conclusion ERCP is safe,effective and feasible for patients with duodenum stricture,which can be performed by posture change or guidewire leading method in mild stricture,and stylolitic water sac dilation or

  14. Resultados del drenaje de la vía biliar por CPRE en pacientes con edad geriátrica Outcomes of bile duct drainage by means of ERCP in geriatric patients

    Directory of Open Access Journals (Sweden)

    J. García-Cano

    2007-08-01

    Full Text Available Antecedentes y objetivo: la colangiopancreatografía retrógrada endoscópica (CPRE es habitualmente la técnica de elección para desobstruir la vía biliar. Una gran parte de los pacientes a los que se realiza esta intervención están en edad geriátrica (mayores de 75 años. Nuestro objetivo ha sido valorar la eficacia de la CPRE en este grupo de pacientes, comparado con los de menor edad. Pacientes y métodos: estudio retrospectivo en el que se han incluido los pacientes a quienes se realizó terapéutica biliar endoscópica mediante CPRE en un periodo de cuatro años (2002-2005. Resultados: se realizó CPRE a 178 pacientes en edad geriátrica y a 159 de menor edad. No hubo diferencias en el éxito del drenaje biliar (97,7-98,7%, en el número de complicaciones (11,8-14,4%, ni en la mortalidad (1,1-0,6%. Por el contrario, en el grupo geriátrico hubo más coledocolitiasis (57,3-39,6%, p = 0,004 y se utilizaron más prótesis metálicas autoexpandibles para drenar la ictericia obstructiva tumoral (47-8%, p = 0,0035. En el grupo de menor edad se repitieron más CPRE a los mismos pacientes (4-10%, p = 0,001. Conclusiones: el éxito y la morbimortalidad para drenar la vía biliar mediante CPRE son similares en los pacientes con edad geriátrica y en los de edad inferior. La coledocolitiasis es más frecuente en los pacientes mayores. No se debe excluir a ningún paciente que precise de una CPRE sólo por la edad.Background and objective: endoscopic retrograde cholangiopancreatography (ERCP is usually the procedure of choice for relieving bile duct obstruction. A large number of patients undergoing this intervention are geriatric population (aged 75 years of age and older. Our aim was to assess the efficacy of ERCP in this group of patients as compared to younger ones. Patients and methods: a retrospective study. All patients in whom a therapeutic biliary endoscopy had been performed over a four-year period of time (2002-2005 were included

  15. [Intra-graft balloon pumping--a clinical case report].

    Science.gov (United States)

    Nagata, M; Tashiro, T; Tanaka, K; Haruta, Y; Todo, K

    1991-12-01

    A 29-year-old female underwent tube graft replacement of distal aortic arch and descending aorta for dissecting aneurysm. After 42 minutes of aortic cross-clamping the patient was initially weaned satisfactorily from cardiopulmonary bypass (CPB). However, cardiac arrhythmia and cardiac arrest necessitated reestablishment of CPB. Electro-cardiography showed inferior myocardial infarction. To wean CPB intraaortic balloon pumping (IABP) was mandatory. But because of dissecting aortic aneurysm IABP in conventional method was contra-indicated. Intra graft balloon pumping (IGBP) was initiated while the patient was on full CPB. A low-porosity woven Dacron tube graft (22 mm) was anastomosed end-to-side to ascending aorta. A balloon was inserted into the tube graft to establish IGBP. This IGBP provided effective circulatory assist. The patient was weaned from CPB 1 hours after reestablishment of IGBP. Postoperative course was stable. The patient was returned to the operating room for removal of the balloon 3 days postoperatively. We reported the case for whom IGBP was effective. IGBP was effective circulatory support for the patient when conventional use of IABP was contra-indicated. PMID:1774515

  16. 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.

  17. 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.

  18. Balloon dilatation of the esophageal stricture in infants and children

    Energy Technology Data Exchange (ETDEWEB)

    Choo, Sung Wook; Kim, In One; Kim, Woo Sun; Yeon, Kyung Mo; Kim, Woo Ki; Park, Kwi Won; Han, Man Chung [Seoul Natioal University College of Medicine, Seoul (Korea, Republic of); Lee, Gi Jae [Inje University Paik Hospital, Seoul (Korea, Republic of); Yu, Pil Mun [Dankuk University College of Medicine, Seoul (Korea, Republic of)

    1992-09-15

    Balloon dilatation has been applied in treating of various pathologic narrowing of the hollow viscus. It is now accepted as a very effective modality especially in treating esophageal stenosis obviating surgical procedure. We performed 128 balloon dilatations in 29 patients with the number of dilatations in each patient ranging from once to 12 times. The age distribution of the patients was from 3 weeks to 6 years, with the median age of 3 months. Twenty nine patients consisted of 25 postoperative esophageal strictures (21 esophageal atresia with tracheoesophageal fistula, 1 congenital esophageal stenosis, 2 tracheobronchial remnant, and 1 congenital esophageal stenosis with esophageal atresia), 2 achalasia, 1 congenital esophageal stenosis, and 1 corrosive esophagitis. We had successful dilatation in 22 patients, who showed subsequent relief of symptoms and improvement in the diameter of stenotic segment. In 14 patients, esophageal perforation occurred during the procedure, one requiring emergency thoracotomy and the other three conservative management. Seven patients had no improvement in stenotic sites after several balloon dilatations. Failed cases were congenital stenosis, achalasia, corrosive esophagitis and four postoperative strictures. We believe that balloon dilatation is the procedure of choice in the treatment of postoperative esophageal stricture in infants and children and is a safe method as the perforation which can complicate the procedure could be managed conservatively.

  19. 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.

  20. 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

  1. Hot Air Balloon: An Unusual Cause of Multicasualty Trauma Incident.

    Science.gov (United States)

    Persoz, Marc-Olivier; Dami, Fabrice; Ciavatta, Ettore; Vallotton, Laurent; Albrecht, Roland; Carron, Pierre-Nicolas

    2016-01-01

    Hot air balloon incidents are few and far between compared with the total number of flights. Nevertheless, hot air balloon incidents may produce severe trauma involving several patients and are linked to significant mortality. The prehospital management of injured patients starts after having secured potential surrounding dangers, such as fire or explosion. In the context of a rescue by helicopter, close attention must be paid to potential obstacles, like trees or electrical wires, and the risk of aspiration of the balloon envelope into the rotor. Patients involved in such incidents are often split up in a closed perimeter around the crash point. The severity of the trauma depends essentially on the height of the fall. The most frequent traumatic lesions involve fractures of the lower limbs, the spine, and the pelvis as well as severe burns caused by the balloon fire. Because of the number of patients present, an initial triage is usually required at the site. The use of rescue helicopters can be helpful. They can perform aerial reconnaissance, provide on-site high-level resources, enable access to the patients even in hostile environments, and quickly transport them to trauma center hospitals. PMID:27255882

  2. 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.

  3. 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.

  4. [Expansion dilatation balloons for cervical ripening in obstetric practice].

    Science.gov (United States)

    Ducarme, G; Grange, J; Vital, M

    2016-02-01

    During recent decades, mechanical devices have been substituted by pharmacological methods. Their place in the therapeutic arsenal remains important with a renewed obstetrical interest for these devices. Due to a lack of data they are still not recommended as first-line. This review thus attempted to examine the use of expansion dilatation balloons (Foley catheter and double-balloons) to analyze their effectiveness in case of native uterus and previous cesarean section. Twenty-seven clinical trials had compared balloons catheter and prostaglandins in patients without a history of uterine scar. The risk of cesarean section did not differ. Mechanical methods seemed to be more effective in achieving delivery within 24hours, with fewer episodes of excessive uterine contractions, but they necessitated more oxytocin during labor. Ten clinical trials analyzed dilatation balloons in patients with previous cesarean section. More than 70% women had favorable cervical ripening (Bishop score>6), and vaginal delivery was reported between 35 and 70% of patients. The risk of uterine rupture was low between 0.64 and 0.72%, with neither increased risk of severe neonatal and maternal morbidity nor increased risk of infectious morbidity. Mechanical methods are effective and safe for third trimester cervical ripening, mainly in women with previous cesarean section. Potential advantages may include wide availability and reduction of some of the side effects. PMID:26774842

  5. Stability of infernal and ballooning modes in advanced tokamak scenarios

    NARCIS (Netherlands)

    Holties, H. A.; Huysmans, G. T. A.; Goedbloed, J. P.; Kerner, W.; Parail, V.V.; Soldner, F. X.

    1996-01-01

    A numerical parameter study has been performed in order to find MHD stable operating regimes for advanced tokamak experiments In this study we have concentrated on internal modes. Ballooning stability and stability with respect to infernal modes are considered. The calculations confirm that pressure

  6. 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.

  7. Balloon-assisted coiling through a 5-French system

    International Nuclear Information System (INIS)

    We present a catheter technique that utilizes a 5F system for the purpose of balloon-assisted coiling in the setting of intracranial aneurysms. A standard 5F short sheath is placed in the common femoral artery, and a 5F diagnostic catheter is placed through the sheath and used for selective vessel angiography. When endovascular intervention is pursued, the diagnostic catheter is placed in the appropriate vessel and systemic heparinization is ensured. Over an exchange length wire, the 5F vertebral catheter and 5F short sheath are exchanged for a 5F Shuttle (Cook) sheath. We then routinely place a 10, 14 or 18 microcatheter over an appropriately gauged microguidewire into the aneurysm. As needed, balloon catheters are then placed across the neck of the aneurysm for remodeling purposes. During the course of the procedure, control angiography is performed through the Shuttle sheath. Following the placement of coils, the microcatheter and balloon catheter are removed and a final biplane image is obtained via the 5F Shuttle sheath. This technique has been employed in 15 patients who required balloon-assisted coiling of an intracranial aneurysm. There were no technical difficulties or arterial access site complications from the procedures. Catheter mobility and torque were not affected, nor was the quality of our imaging. We conclude that this small-diameter system provides ample ''room'' for catheter placement and interventional treatment while reducing the known risks of postprocedural complications. Angiographic images remain excellent and are comparable to those obtained by larger catheters. (orig.)

  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. Lightweight Liquid Helium Dewar for High-Altitude Balloon Payloads

    Science.gov (United States)

    Kogut, Alan; James, Bryan; Fixsen, Dale

    2013-01-01

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

  10. ENBD治疗ERCP后胆管感染及高淀粉酶血症疗效分析%Effects of ENBD Treating Post-ERCP Biliary Tract Infection and Hyperamylasemia

    Institute of Scientific and Technical Information of China (English)

    黄亚彬

    2012-01-01

    目的 评价内镜鼻胆管引流术(ENBD)治疗经内镜逆行胰胆管造影(ERCP)术后胆管感染和高淀粉酶血症疗效.方法 选择行ERCP胆总管结石患者120例,其中术后未给予ENBD60例作为对照组,术后给予ENBD60例作为治疗组.结果 治疗组和对照组血清淀粉酶值和C反应蛋白值在术前比较,差异无统计学意义(P>0.05),术后3h和24 h对比,差异有统计学意义(P<0.01),治疗组优于对照组.同时,治疗组胆管感染和高淀粉酶血症发生率均低于对照组,差异有统计学意义(P<0.05).结论 鼻胆管引流术对ERCP术后胆管感染和高淀粉酶血症均有一定的预防作用.%Objective To evaluate endoscopic naso-biliary drainage (ENBD) effect on post-ERCP biliar-y tract infection and hyperamylasemia. Methods 120 cases with common bile duct stones for routine ERCP were selected, among which 60 cases not given ENBD were set as the control group, the other 60 cases given ENBD were set as the treatment group. Results After observation, amylase and CRP levels of the two groups were not statistically significantly different from before surgery(P >0. 05) ,while significant differences were seen between 3 hours after surgery and 24 hours after surgery(P <0.01 ) ,the treatment group better than the control group. The biliary tract infection and hyperamylasemia rates in the treatment group were lower than that in the control group (P < 0. 05). Conclusion ENBD treatment has a certain preventive function on post-ERCP biliary tract infection and hyperamylasemia.

  11. 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

  12. 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

  13. 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

  14. A meta-analysis for the effect of prophylactic GTN on the incidence of post-ERCP pancreatitis and on the successful rate of cannulation of bile ducts

    Directory of Open Access Journals (Sweden)

    Wang Chun-hui

    2010-07-01

    Full Text Available Abstract Background Glyceryl trinitrate (GTN has been shown to be able to relax the sphincter of Oddi (SO both in animals and humans. Theoretically, the use of these compounds during and after endoscopic retrograde cholangiopancreatgraphy (ERCP could relax the biliary and pancreatic sphincters, facilitating cannulation of common bile duct (CBD during the procedure, or minimizing potential pancreatic outflow obstruction after the procedure. However, clinical trials evaluating the protective effect of GTN on the post-endoscopic retrograde cholangiopancreatgraphy pancreatitis (PEP have yielded inconclusive results. This meta-analysis is to systematically assess the effect of prophylactic administration of glyceryl trinitrate (GTN on the prevention of PEP and the effect on the cannulation of bile ducts. Methods By searching PubMed (1966 to September 2009, CENTRAL (Cochrane Controlled trials Register; issue 3, 2009 and EMBASE.com (1984 to September 2009, two independent reviewers systematically identified prospective randomized controlled trials (RCTs detecting the effect of prophylactic GTN on the incidence of PEP and on the cannulation of bile ducts. A meta-analysis of these clinical trials was then performed. Results There are 55/899(6.1% patients suffering PEP in the treatment group versus 95/915(10.4% patients in the placebo group. The overall pooled risk of PEP was significantly lower in the GTN group than in the placebo group (OR 0.56, 95% CI: 0.40 to 0.79, p = 0.001. Subgroup analyses suggested that GTN administered by the sublingual form (OR 0.34,95% CI:0.16 to 0.75, p = 0.007 is more effective than transdermal route(OR 0.64,95% CI:0.40 to 1.01, p = 0.05, and the protective effect of GTN was far more obvious in the centers with high incidence of PEP (OR 0.40, 95% CI:0.24 to 0.67, p = 0.0006 than those centers with a low incidence of PEP (OR 0.75, 95% CI: 0.47 to 1.20, p = 0.22. Additionally, the meta-analysis suggests that GTN was not

  15. Designing the Balloon Experimental Twin Telescope for Infrared Interferometry

    Science.gov (United States)

    Rinehart, Stephen

    2011-01-01

    While infrared astronomy has revolutionized our understanding of galaxies, stars, and planets, further progress on major questions is stymied by the inescapable fact that the spatial resolution of single-aperture telescopes degrades at long wavelengths. The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII) is an 8-meter boom interferometer to operate in the FIR (30-90 micron) on a high altitude balloon. The long baseline will provide unprecedented angular resolution (approx. 5") in this band. In order for BETTII to be successful, the gondola must be designed carefully to provide a high level of stability with optics designed to send a collimated beam into the cryogenic instrument. We present results from the first 5 months of design effort for BETTII. Over this short period of time, we have made significant progress and are on track to complete the design of BETTII during this year.

  16. Stabilization of ballooning modes with sheared toroidal rotation

    International Nuclear Information System (INIS)

    A new code demonstrates the stabilization of MHD ballooning modes by sheared toroidal rotation. A shifted-circle model is used to elucidate the physics, and numerically reconstructed equilibria are used to analyze DIII-D discharges. In the ballooning representation, the modes shift periodically along the field line to the next point of unfavorable curvature. The shift frequency (dΩ/dq, where Ω is the angular toroidal velocity and q is the safety factor) is proportional to the rotation shear and inversely proportional to the magnetic shear. Stability improves with increasing shift frequency and, in the shifted circle model, direct stable access to the second stability regime occurs when this frequency is a fraction of the Alfven frequency, ωA = VA/qR. Shear stabilization is also demonstrated for an equilibrium reconstruction of a DIII-D VH-mode. (author). 9 refs, 3 figs

  17. 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.

  18. [Adherence and fidelity in patients treated with intragastric balloon].

    Science.gov (United States)

    Mazure, R A; Cancer, E; Martínez Olmos, M A; De Castro, M L; Abilés, V; Abilés, J; Bretón, I; Álvarez, V; Peláez, N; Culebras, J M

    2014-01-01

    A correct treatment of obesity needs a program of habits modification regardless of the selected technique, especially if it is minimally invasive as the intragastric balloon (BIG). The adherence of the obese patients with regard to recommended drugs measures to medium- and long-term is less than 50%. Given that the results obtained using the technique of gastric balloon must be seen influenced by adherence to the modification of habits program and its fulfillment, we reviewed series published in attention to the program proposed with the BIG. The series published to date provide few details about the used Therapeutic Programs as well as the adherence of patients to them, and even less concerning the Monitoring Plan and the loyalty of the patient can be seen. We conclude the convenience to agree on a follow-up strategy, at least the 6 months during which the BIG remain in the stomach. PMID:24483961

  19. Electrodynamics of the stratosphere using 5000 cu m superpressure balloons

    Science.gov (United States)

    Holzworth, R. H.

    1983-01-01

    The Electrodynamics of the Middle Atmosphere research project encompasses the design of a microprocessor-controlled payload and the launch of up to eight small superpressure balloons in the 1982-1984 period. The primary payload instrument will measure the vector electric field from dc to 10 kHz, and the payloads will include instruments measuring local ionization, electrical conductivity, magnetic field, and temperature and pressure fluctuations. In addition, optical lightning will be recorded. The simultaneous measurement of these stratospheric parameters by several balloons, for periods extending over several solar rotations, will allow the study of electrical coupling between atmosphere and magnetosphere, of global current systems, and of global response to solar flares and magnetospheric storms.

  20. 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.

  1. Intraaortic Balloon Pump Counterpulsation and Cerebral Autoregulation: an observational study

    OpenAIRE

    Boots Rob; Barnett Adrian G; Timms Daniel; Dunster Kimble; Geng Shureng; Bellapart Judith; Fraser John F

    2010-01-01

    Abstract Background The use of Intra-aortic counterpulsation is a well established supportive therapy for patients in cardiac failure or after cardiac surgery. Blood pressure variations induced by counterpulsation are transmitted to the cerebral arteries, challenging cerebral autoregulatory mechanisms in order to maintain a stable cerebral blood flow. This study aims to assess the effects on cerebral autoregulation and variability of cerebral blood flow due to intra-aortic balloon pump and in...

  2. 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.

  3. Effect of Externally Driven Magnetic Islands on Resistive Ballooning Turbulence

    OpenAIRE

    NISHIMURA, Seiya; Yagi, Masatoshi

    2011-01-01

    Turbulent transport in the edge region of tokamak plasmas is simulated using a reduced set of magnetohydrodynamic equations. Repetitive and intermittent transport bursts driven by resistive ballooning turbulence with external heating are observed. The effect of a resonant magnetic perturbation (RMP) on turbulent heat transport is examined, where the electromagnetic response of the plasma to the RMP is solved consistently. The penetration of the RMP excites a magnetic island chain and damps th...

  4. 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

  5. Latex Micro-balloon Pumping in Centrifugal Microfluidic Platforms

    OpenAIRE

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

    2014-01-01

    Centrifugal microfluidic platforms have emerged as point-of-care diagnostic tools. However, the unidirectional nature of the centrifugal force limits the available space for multi-stepped processes on a single microfluidics disc. To overcome this limitation, a passive pneumatic pumping method actuated at high rotational speeds has been previously proposed to pump liquid against the centrifugal force. In this paper, a novel micro-balloon pumping method that relies on elastic energy stored in a...

  6. 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.

  7. 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.

  8. 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...

  9. 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.

  10. Inverted Meckel's diverticulum preoperatively diagnosed using double-balloon enteroscopy.

    Science.gov (United States)

    Takagaki, Kosuke; Osawa, Satoshi; Ito, Tatsuhiro; Iwaizumi, Moriya; Hamaya, Yasushi; Tsukui, Hiroe; Furuta, Takahisa; Wada, Hidetoshi; Baba, Satoshi; Sugimoto, Ken

    2016-05-01

    An inverted Meckel's diverticulum is a rare gastrointestinal congenital anomaly that is difficult to diagnose prior to surgery and presents with anemia, abdominal pain, or intussusception. Here, we report the case of 57-year-old men with an inverted Meckel's diverticulum, who was preoperatively diagnosed using double-balloon enteroscopy. He had repeatedly experienced epigastric pain for 2 mo. Ultrasonography and computed tomography showed intestinal wall thickening in the pelvis. Double-balloon enteroscopy via the anal route was performed for further examination, which demonstrated an approximately 8-cm, sausage-shaped, submucosal tumor located approximately 80 cm proximal to the ileocecal valve. A small depressed erosion was observed at the tip of this lesion. Forceps biopsy revealed heterotopic gastric mucosa. Thus, the patient was diagnosed with an inverted Meckel's diverticulum, and single-incision laparoscopic surgery was performed. This case suggests that an inverted Meckel's diverticulum should be considered as a differential diagnosis for a submucosal tumor in the ileum. Balloon-assisted enteroscopy with forceps biopsy facilitate a precise diagnosis of this condition. PMID:27158212

  11. 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. .

  12. 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.

  13. Early clinical outcome and complications related to balloon kyphoplasty

    Directory of Open Access Journals (Sweden)

    Martin Bergmann

    2012-06-01

    Full Text Available The treatment of painful osteoporotic vertebral compression fractures using transpedicular cement augmentation has grown significantly over the last two decades. The benefits of balloon kyphoplasty compared to conservative treatment remain controversial and are discussed in the literature. The complication rates of vertebroplasty and kyphoplasty are considered to be low. The focus of this study was the analysis of acute and clinically relevant complications related to this procedure. In our department, all patients treated between February 2002 and February 2011 with percutaneous cement augmentation (372 patients, 522 augmented vertebral bodies were prospectively recorded. Demographic data, comorbidities, fracture types, intraoperative data and all complications were documented. The pre- and postoperative pain-level and neurological status (Frankel-Score were evaluated. All patients underwent a standardized surgical procedure. Two hundred and ninety-seven patients were treated solely by balloon kyphoplasty; 216 females (72.7% and 81 males (27.3%. Average patient age was 76.21 years (±10.71, range 35-98 years. Average American Society Anestesiologists score was 3.02. According to the Orthopedic Trauma Association classification, there were 69 A 1.1 fractures, 177 A 1.2 fractures, 178 A 3.1.1 fractures and 3 A 3.1.3 fractures. Complications were divided into preoperative, intraoperative and postoperative events. There were 4 pre-operative complications: 3 patients experienced persistent pain after the procedure. In one case, the pedicles could not be visualized during the procedure and the surgery was terminated. One hundred and twenty-nine (40.06% of the patients showed intraoperative cement leaking outside the vertebras, one severe hypotension and tachycardia as reaction to the inflation of the balloons, and there was one cardiac arrest during surgery. Postoperative subcutaneous hematomas were observed in 3 cases, 13 patients developed a

  14. 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

    This report describes a study evaluating the potential for a balloon-based optical telescope as a planetary science asset to achieve decadal class science. The study considered potential science achievable and science traceability relative to the most recent planetary science decadal survey, potential platform features, and demonstration flights in the evaluation process. Science Potential and Benefits: This study confirms the cost the-benefit value for planetary science purposes. Forty-four (44) important questions of the decadal survey are at least partially addressable through balloon based capabilities. Planetary science through balloon observations can provide significant science through observations in the 300 nm to 5 m range and at longer wavelengths as well. Additionally, balloon missions have demonstrated the ability to progress from concept to observation to publication much faster than a space mission increasing the speed of science return. Planetary science from a balloon-borne platform is a relatively low-cost approach to new science measurements. This is particularly relevant within a cost-constrained planetary science budget. Repeated flights further reduce the cost of the per unit science data. Such flights offer observing time at a very competitive cost. Another advantage for planetary scientists is that a dedicated asset could provide significant new viewing opportunities not possible from the ground and allow unprecedented access to observations that cannot be realized with the time allocation pressures faced by current observing assets. In addition, flight systems that have a relatively short life cycle and where hardware is generally recovered, are excellent opportunities to train early career scientists, engineers, and project managers. The fact that balloon-borne payloads, unlike space missions, are generally recovered offers an excellent tool to test and mature instruments and other space craft systems. Desired Gondola Features: Potential

  15. Intestinal cholesterol embolism resulting from intra-aortic balloon pumping: a case report

    OpenAIRE

    Yamaguchi, Satoshi; Kakazu, Masanori; Osamu, Arasaki

    2014-01-01

    Introduction Intra-aortic balloon pumping is used in elective percutaneous coronary intervention for increasing coronary blood flow. However, intra-aortic balloon pumping may decrease visceral blood flow and cause mesenteric ischemia by visceral artery obstruction. Case presentation We report the case of a 79-year-old Asian man in whom elective percutaneous coronary intervention was performed with intra-aortic balloon pumping. He died from mesenteric ischemia 25 hours after the procedure. Mic...

  16. 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.

  17. 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 ...

  18. ERCP胆管支架在恶性胆管梗阻中的临床应用#%Clinical Application of ERCP Biliary Stents in Malignant Biliary Obstruction

    Institute of Scientific and Technical Information of China (English)

    曾安祥; 刘波颖; 张德强; 曾德辉

    2014-01-01

    average survival time and stent patency time two indicators, compared between the two groups, the metal stents was signiifcantly longer than the plastic stent group. Conclusion: Compared with plastic stents, the treatment effect of the metal stents and with the implementation of ERCP biliary stenting is better, and it is the reliable choice for malignant biliary obstruction implementation of clinical biliary stent drainage treatment.

  19. 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.)

  20. 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

  1. Experimental investigation of undesired stable equilibria in pumpkin shape super-pressure balloon designs

    Science.gov (United States)

    Schur, W.

    The scientific community's desire for large capacity, constant altitude, long duration stratospheric platforms is not likely going to be met by un-reinforced spherical super-pressure balloons. More likely, the pneumatic envelope for the large-scale super-pressure balloon of the future will be a tendon reinforced structure in which the tendons perform the primary pressure load confining function and the skin serves as a gas barrier and transfers the local pressure load to the tendons. NASA's Ultra Long Duration Balloon (ULDB), which is currently under development, is of that type. By separating the load carrying function of the tendons and the skin a number of advantages are gained. Perhaps most important is the fact that the required skin strength remains to first order independent of the balloon size. Only the size and number of tendons are dictated by the balloon size. By designing the balloon to be at least quasi statically determinate, the stress distributions are more certain, and stress raisers due to fabrication imperfections are more easily controlled and it becomes unnecessary to account for load path uncertainties by providing everywhere excessive strength and structural weight. Furthermore, it becomes possible to use for the envelope skin a visco-elastic film (polyethylene) that has proven performance in the stratospheric environment. The silhouette shape of this balloon type has prompted early researchers to name this design a "pumpkin" shape balloon. Later investigators accepted this terminology. The pumpkin shape balloon concept was adopted by NASA for its ULDB design at the end of 1998 when advantages of that design over a spherical shape design were convincingly demonstrated. Two stratospheric test flights of large-scale super-pressure balloons demonstrated the functioning of this balloon type. In the second successful flight the switch was made from an excessively strong and heavy skin, a holdover from the earlier concept of a spherical design, to

  2. Long-Duration Altitude-Controlled Balloons for Venus: A Feasibility Study Informed by Balloon Flights in Remote Environments on Earth

    Science.gov (United States)

    Voss, P. B.; Nott, J.; Cutts, J. A.; Hall, J. L.; Beauchamp, P. M.; Limaye, S. S.; Baines, K. H.; Hole, L. R.

    2013-12-01

    In situ exploration of the upper atmosphere of Venus, approximately 65-77 km altitude, could answer many important questions (Limaye 2013, Crisp 2013). This region contains a time-variable UV absorber of unknown composition that controls many aspects of the heat balance on Venus. Understanding the composition and dynamics of this unknown absorber is an important science goal; in situ optical and chemical measurements are needed. However, conventional approaches do not provide access to this altitude range, repeated traverses, and a mission lifetime of several months needed to effectively carry out the science. This paper examines concepts for altitude-controlled balloons not previously flown on planetary missions that could potentially provide the desired measurements. The concepts take advantage of the fact that at 60 km altitude, for example, the atmospheric density on Venus is about 40% of the sea-level density on earth and the temperature is a moderate 230 K. The solar flux is approximately double that on earth, creating some thermal challenges, but making photovoltaic power highly effective. Using a steady-state thermodynamic model and flight data from Earth, we evaluate the suitability of two types of altitude-controlled balloons for a potential mission on Venus. Such balloons could repeatedly measure profiles, avoid diurnal temperature extremes, and navigate using wind shear. The first balloon design uses air ballast (AB) whereby ambient air can be compressed into or released from a constant-volume balloon, causing it to descend or ascend accordingly. The second design uses lift-gas compression (LGC) to change the volume of a zero-pressure balloon, thereby changing its effective density and altitude. For an altitude range of 60-75 km on Venus, we find that the superpressure volume for a LGC balloon is about 5% of that needed for an AB balloon while the maximum pressurization is the same for both systems. The compressor work per km descent of the LGC balloon

  3. Modeling plaque fissuring and dissection during balloon angioplasty intervention.

    Science.gov (United States)

    Gasser, T Christian; Holzapfel, Gerhard A

    2007-05-01

    Balloon angioplasty intervention is traumatic to arterial tissue. Fracture mechanisms such as plaque fissuring and/or dissection occur and constitute major contributions to the lumen enlargement. However, these types of mechanically-based traumatization of arterial tissue are also contributing factors to both acute procedural complications and chronic restenosis of the treatment site. We propose physical and finite element models, which are generally useable to trace fissuring and/or dissection in atherosclerotic plaques during balloon angioplasty interventions. The arterial wall is described as an anisotropic, heterogeneous, highly deformable, nearly incompressible body, whereas tissue failure is captured by a strong discontinuity kinematics and a novel cohesive zone model. The numerical implementation is based on the partition of unity finite element method and the interface element method. The later is used to link together meshes of the different tissue components. The balloon angioplasty-based failure mechanisms are numerically studied in 3D by means of an atherosclerotic-prone human external iliac artery, with a type V lesion. Image-based 3D geometry is generated and tissue-specific material properties are considered. Numerical results show that in a primary phase the plaque fissures at both shoulders of the fibrous cap and stops at the lamina elastica interna. In a secondary phase, local dissections between the intima and the media develop at the fibrous cap location with the smallest thickness. The predicted results indicate that plaque fissuring and dissection cause localized mechanical trauma, but prevent the main portion of the stenosis from high stress, and hence from continuous tissue damage.

  4. The readout electronic of EUSO-Balloon experiment

    Science.gov (United States)

    Ahmad, S.; Barrillon, P.; Blaksley, C.; Blin-Bondil, S.; Ebersoldt, A.; Dagoret-Campagne, S.; de la Taille, C.; Dulucq, F.; Gorodetzky, P.; Miyamoto, H.; Moretto, C.; Prévôt, G.; Reina, J. A. R.

    2014-03-01

    The EUSO-Balloon experiment is a pathfinder for the satellite mission JEM-EUSO whose goal will be to observe Extensive Air Showers produced in the atmosphere by the passage can detect fluorescent UV photons released by the EAS thanks to Multi-anode photomultipliers (MAPMT) arranged in 6 × 6 matrices inside Photo Detector Modules (PDM). A set of lenses is used to focus the photons on the PDM which can be compared to a UV camera taking pictures every 2.5 μs period (GTU: Gate Time Unit). The experiment consists in launching a balloon, at an altitude of 40 km, equipped with complete PDM and Data Processing systems. This project, supported by CNES and constructed by the JEM-EUSO collaboration, is meant to prove that the technology of such an instrument is possible and that the performance is satisfying, raising the Technical Readiness Level (TRL) of JEM-EUSO. Moreover, complex trigger algorithms will be assessed and the main back ground (night glow plus star light) will be studied. A complex readout electronic chain has been designed for the EUSO-Balloon project. It contains two elements: the 9 EC units and the 6 EC-ASIC boards. The EC unit includes four 64-channel Multi-Anode Photomultipliers and a set of pcbs used to supply the 14 different high voltages needed by the MAPMTs and to read out the analog anode signals. These signals are transmitted to the EC-ASIC boards which contain 6 SPACIROC ASICs each. During the year 2012, prototypes of each board were produced and tested successfully, leading to the production of the flight model PCBs in 2013.

  5. Biogenic nonmethane hydrocarbon emissions estimated from tethered balloon observations

    Science.gov (United States)

    Davis, K. J.; Lenschow, D. H.; Zimmerman, P. R.

    1994-01-01

    A new technique for estimating surface fluxes of trace gases, the mixed-layer gradient technique, is used to calculate isoprene and terpene emissions from forests. The technique is applied to tethered balloon measurements made over the Amazon forest and a pine-oak forest in Alabama at altitudes up to 300 m. The observations were made during the dry season Amazon Boundary Layer Experiment (ABLE 2A) and the Rural Oxidants in the Southern Environment 1990 experiment (ROSE I). Results from large eddy simulations of scalar transport in the clear convective boundary layer are used to infer fluxes from the balloon profiles. Profiles from the Amazon give a mean daytime emission of 3630 +/- 1400 micrograms isoprene sq m/h, where the uncertainty represents the standard deviation of the mean of eight flux estimates. Twenty profiles from Alabama give emissions of 4470 +/- 3300 micrograms isoprene sq m/h, 1740 +/- 1060 micrograms alpha-pinene sq m/h, and 790 +/- 560 micrograms beta-pinene sq m/h, respectively. These results are in agreement with emissions derived from chemical budgets. The emissions may be overestimated because of uncertainty about how to incorporate the effects of the canopy on the mixed-layer gradients. The large variability in these emission estimates is probably due to the relatively short sampling times of the balloon profiles, though spatially heterogeneous emissions may also play a role. Fluxes derived using this technique are representative of an upwind footprint of several kilometers and are independent of hydrocarbon oxidation rate and mean advection.

  6. Fine tracking system for balloon-borne telescopes

    OpenAIRE

    Ricci, M.; Pedichini, F.; Lorenzetti, D.

    2011-01-01

    We present the results of a study along with a first prototype of a high precision system (? 1 arcsec) for pointing and tracking light (near-infrared) telescopes on board stratospheric balloons. Such a system is essentially composed by a star sensor and by a star tracker, able to recognize the field and to adequately track the telescope, respectively. We present the software aimed at processing the star sensor image and the predictive algorithm that allows the fine tracking of the source at a...

  7. Balloon-borne observations of mid-latitude hydrofluoric acid

    Science.gov (United States)

    Sen, B.; Toon, G. C.; Blavier, J.-F.; Szeto, J. T.; Fleming, E. L.; Jackman, C. H.

    1995-01-01

    Measurements of stratospheric hydrofluoric acid (HF) have been made by the JPL MkIV interferometer during high-altitude balloon flights. Infrared solar absorption spectra were acquired near 35 deg N at altitudes between local tropopause and 38 km. Volume mixing ratio profiles of HF derived from 4 flights (1990-93), in conjunction with simultaneously observed N2O profiles, indicate an average rate of HF increase of (5.5 +/- 0.3)% per year, in agreement with time-dependent, two-dimensional model simulations (6% per year) and ATMOS measurements.

  8. 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.

  9. The GRAD high-altitude balloon flight over Antarctica

    International Nuclear Information System (INIS)

    The Gamma Ray Advanced Detector(GRAD) consists of a n-type germanium detector inside an active bismuth-germanate Compton and charged particle shield with additional active plastic shielding across the aperture. It will be flown on a high altitude balloon at 36 km altitude at a latitude of 78 degree S over Antarctica for observations of gamma radiation emitted by the radioactive decay of 56Co in the Supernova SN1987A, for assessment of the performance of bismuth-germanate scintillation material in the radiation environment of near space, for gathering information on the gamma-ray background over Antarctica, and for testing fault-tolerant software

  10. Application of double-balloon enteroscopy in jejunal diverticular bleeding

    Institute of Scientific and Technical Information of China (English)

    Tsung-Hsing; Chen; Cheng-Tang; Chiu; Chen-Ming; Hsu

    2010-01-01

    AIM:To evaluate the efficacy of endoscopic diagnosis and therapy for jejunal diverticular bleeding.METHODS:From January 2004 to September 2009,154 patients underwent double-balloon enteroscopy (DBE) for obscure gastrointestinal bleeding.Ten consecutive patients with jejunal diverticula (5 males and 5 females) at the age of 68.7 ± 2.1 years (range 1995 years) at Chang Gung Memorial Hospital,Academic Tertiary Referral Center,were enrolled in this study.RESULTS:Of the 10 patients,5 had melena,2 had hematochezi...

  11. Detachable balloon embolization of an aneurysmal gastroduodenal arterioportal fistula

    Energy Technology Data Exchange (ETDEWEB)

    Defreyne, Luc; De Schrijver, Ignace; Vanlangenhove, Peter; Kunnen, Marc [Department of Radiology and Medical Imaging, Ghent University Hospital (Belgium)

    2002-01-01

    Extrahepatic arteriovenous fistulas involving the gastroduodenal artery and the portal venous system are rare and almost always a late complication of gastric surgery. Secondary portal hypertension and mesenteric ischemia may provoke abdominal pain, upper and lower gastrointestinal hemorrhage, diarrhea, and weight loss. Until recently, surgical excision has been the therapy of choice with excellent results. The authors report a case of gastroduodenal arterioportal fistula with a rare large interpositioned aneurysm in a cardiopulmonary-compromised patient who was considered a non-surgical candidate. The gastroduodenal arterioportal fistula was occluded endovascularly by means of a detachable balloon. A survey of the literature of this rare type of arterioportal fistula is included. (orig.)

  12. 胆囊收缩素拮抗剂对ERCP术后胰腺功能影响的临床研究%The effect of cholecystokinin-receptor antagonist proglumide on the pancreas function of post-ERCP

    Institute of Scientific and Technical Information of China (English)

    彭海峰; 闫玉矿; 霍红军; 李德宁; 段君英; 杨镇

    2005-01-01

    目的探讨丙谷胺对逆行胰胆管造影(ERCP)术后胰腺功能的影响.方法43例ERCP术患者随机分为对照组(S组,20例)和丙谷胺组(P组,23例),术前均禁食10 h,P组于术前4 h、术后4 h及24 h分别舌下含服丙谷胺400 mg.两组均于术前2 h、术后4 h及24 h分别采血备测血清淀粉酶及血浆胆囊收缩素八肽(CCK-OP).结果均顺利完成ERCP.术后,对照组(S组)并发急性胰腺炎3例(15%,3/20),明显高于P组(4.3%,1/23)(P<0.05).P组术后4h血清淀粉酶及血浆CCK-OP均明显低于S组(P<0.05);术后24 h P组血浆CCK-OP与S组差异无显著意义(P>0.05),但血清淀粉酶明显低于S组(P<0.05).结论丙谷胺可有效抑制CCK-OP的作用,保护ERCP术后胰腺的功能,减轻酶血症,预防急性胰腺炎的发生.

  13. Balloon dilatation of post-surgical ano-rectal strictures in two infants

    Energy Technology Data Exchange (ETDEWEB)

    Wilder, W.M.; Melhem, R.E.

    1989-08-01

    Balloon dilatation of ano-rectal strictures offers an alternative to surgical repair of such lesions. This procedure has been described in higher colonic strictures secondary to necrotizing enterocolitis in infants but not in post-surgical ano-rectal strictures. Two cases of successful balloon dilatation are reported. Anal sphincter injury resulting in fecal incontinence, as previously reported, did not occur. (orig.).

  14. The balloon system with stabilized platform and oriented submillimeter telescope: Design

    Science.gov (United States)

    Lapshin, V.; Leonov, V.; Levshuk, B.; Shekshnya, V.

    1994-02-01

    A large number of scientific ballooning programs in the interests both of fundamental sciences (astrophysics, solar physics, etc.) and applied research require fine spatial orientation in inertial space of scientific instruments installed on balloons. Among these, some of the actual programs are the investigations of astophysical objects in gamma- and X-ray, far-infrared/submillimeter regions, as are also high precision magnetometric measurements, the research of the Earth's atmosphere and related ecological problems. As an applied problem, the development of modern balloon-based communication systems is pointed out. A rather large amount of different balloon platforms is developed and used in modern practice of ballooning. The Academy of Sciences of Russia (ASR) provides the design of the balloon-borne oriented and stabilized platform from 1991 (Lebedev Physical Institute, ASR). We have designed and built the balloon platform, that is considered a universal device for future balloon research, where spatial orientation is required. At the first stage of this project, the design of the far-infared version of this platform was performed. The platform is equipped with an 1-meter Cassegrain type telescope (on scheme Nesmith). The primary mirror of spherical form (f/0.5) is made from special aluminum alloy: the construction of telescope is lightweight.

  15. Single Balloon Enteroscopy for Endoscopic Retrograde Cholangiography in a Patient with Hepaticojejunostomy after Liver Transplant

    OpenAIRE

    Salvatore Gruttadauria; Riccardo Volpes; Roberto Miraglia; Marta Di Pisa; Mario Traina

    2010-01-01

    We report a case of a post-transplant patient with hepaticojejunostomy in whom we used a single balloon enteroscopy to access the biliary tree. This procedure seems to be safe and feasible for approaching the biliary anastomosis by means of the overtube and fixation of the small bowel by the balloon.

  16. 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."

  17. Cephalic arch stenosis in autogenous brachiocephalic hemodialysis fistulas: results of cutting balloon angioplasty

    DEFF Research Database (Denmark)

    Heerwagen, Søren Thorup; Lönn, Lars; Schroeder, Torben V;

    2010-01-01

    Cephalic arch stenosis is a known cause of hemodialysis access failure in patients with brachiocephalic fistulas (BCFs). Outcomes of endovascular treatment are affected by resistance of the stenosis to balloon dilation, a high vein rupture rate and the development of early restenosis. The purpose...... of this retrospective study was to report outcomes after cutting balloon angioplasty (CBA) of cephalic arch stenosis....

  18. Clinical study of percutaneous transhepatic balloon dilation: a novel procedure for common bileduct stone

    Institute of Scientific and Technical Information of China (English)

    李玉亮

    2014-01-01

    Objective To investigate the safety and efficacy of percutaneous transhepatic balloon dilation for the removal of common bile duct stone.Methods Sixty-eight cases with common bile duct stone treated with percutaneous transhepatic balloon dilation in our department from July2008 to April 20l1 were analyzed retrospectively.Record CA19-9,total bilirubin,

  19. Effect of oxygen deficiency on response of CR-39 on board scientific balloons

    CERN Document Server

    Fujii, M; Osawa, A; Saitô, T; Yamamoto, K; Hasebe, T; Nakamura, T; Sasaki, H; Yanagita, T; Aglietta, M; Vernetto, S; Castellina, A; Fulgione, W; Saavedra, O; Trinchero, G C

    1999-01-01

    We should be careful about the effect of oxygen deficiency on polymeric track detectors even at balloon altitude. Results of balloon experiments and calibration experiments in a vacuum chamber at different pressures show that the effect of oxygen deficiency becomes serious at a pressure below 10 hPa.

  20. Malignant lymphoma in the ileum diagnosed by double-balloon enteroscopy

    Institute of Scientific and Technical Information of China (English)

    Kazuko Beppu; Nobuhiro Sato; Toshiki Kamano; Yasuo Hayashida; Sumio Watanabe; Taro Osada; Akihito Nagahara; Naoto Sakamoto; Tomoyoshi Shibuya; Masato Kawabe; Takeshi Terai; Toshifumi Ohkusa; Tatsuo Ogihara

    2007-01-01

    A 73-year old man presented with abdominal pain. A tumor with central ulceration was observed in the ileum using double-balloon enteroscopy. Histological findings of the biopsy specimens were consistent with malignant lymphoma. Double-balloon enteroscopy confirmed the diagnosis of a malignant lymphoma tumor which was surgically resected. The patient is still in complete remission now.

  1. Adjustable Intragastric Balloons: A 12-Month Pilot Trial in Endoscopic Weight Loss Management

    NARCIS (Netherlands)

    E. Machytka; P. Klvana; A. Kornbluth; S. Peikin; L.E.M. Mathus-Vliegen; C. Gostout; G. Lopez-Nava; S. Shikora; J. Brooks

    2011-01-01

    Intragastric balloons are associated with (1) early period intolerance, (2) diminished effect within 3-4 months, and (3) bowel obstruction risk mandating removal at 6 months. The introduction of an adjustable balloon could improve comfort and offer greater efficacy. A migration prevention function,

  2. 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.

  3. An analysis of the deployment of a pumpkin balloon on mars

    Science.gov (United States)

    Rand, J.; Phillips, M.

    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, which produces stress resultants determined by the volume of the system, 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. The application of this technology to very large systems is currently being demonstrated by NASA's Ultra Long Duration Balloon (ULDB) Program. However, this type of balloon has certain features that may be exploited to produce a system far more robust than a comparable sphere during deployment, inflation, and operation for long periods of time. When this concept is applied to a system designed to carry two kilograms in the atmosphere of Mars, the resulting balloon is small enough to alter the construction techniques and produce an envelope which is free of tucks and folds which may cause uncontrolled stress concentrations. A technique has been demonstrated where high strength tendons may be pretensioned prior to installation along the centerline of each gore. Since this position is the shortest distance between the apex and nadir of the balloon, the tendons will automatically resist the forces caused by deployment and inflation and thereby protect the thin film gas barrier from damage. A suitable balloon has been designed for this type of mission using five-micron Mylar Type C film for the gas barrier and P O braided cables for the meridionalB load carrying members. 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 ten-kilogram system suspended at the nadir of the balloon. As the

  4. The Balloon Experimental Twin Telescope for Infrared Interferometry

    Science.gov (United States)

    Silverburg, Robert

    2009-01-01

    Astronomical studies at infrared wavelengths have dramatically improved our understanding of the universe, and observations with Spitzer, the upcoming Herschel mission, and SOFIA will continue to provide exciting new discoveries. The comparatively low spatial resolution of these missions, however, is insufficient to resolve the physical scales on which mid- to far-infrared emission arises, resulting in source and structure ambiguities that limit our ability to answer key science questions. Interferometry enables high angular resolution at these wavelengths. We have proposed a new high altitude balloon experiment, the Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII). High altitude operation makes far-infrared (30- 300micron) observations possible, and BETTII's 8-meter baseline provides unprecedented angular resolution (approx. 0.5 arcsec) in this band. BETTII will use a double-Fourier instrument to simultaneously obtain both spatial and spectral information. The spatially resolved spectroscopy provided by BETTII will address key questions about the nature of disks in young cluster stars and active galactic nuclei and the envelopes of evolved stars. BETTII will also lay the groundwork for future space interferometers.

  5. 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...

  6. 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.

  7. 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.

  8. The Use of Zylon Fibers in ULDB Balloons

    Science.gov (United States)

    Zimmerman, M.; Seely, L.; McLaughlin, J.

    Early in the development of the ULDB balloon, Zylon (PBO) was selected as the tendon material due to its favorable stress-strain properties. It is a next generation super fiber whose strength and modulus are almost double those of the p-Aramid fibers. In addition there are two versions of the Zylon, As Spun (AS) and High Modulus (HM). Data will be presented on why the HM was chosen. Early in the development process, it was learned that this material exhibited an unusual sensitivity to degradation by ambient light. This is in addition to the expected sensitivity to UV radiation (Ultraviolet). The fiber manufacturer reported all of these properties in their literature. Due to the operating environment of the ULDB (Ultra Long Duration Balloon) it is necessary to protect the tendons from both visible and UV radiation. Methods to protect the tendons will be discussed. In addition, information on the long term exposure of the braided tendon over a thirty-six month period in a controlled manufacturing plant will be provided.

  9. Percutaneous trigeminal ganglion balloon compression : experience in 40 patients.

    Directory of Open Access Journals (Sweden)

    Natarajan M

    2000-10-01

    Full Text Available Forty patients of trigeminal neuralgia were treated with percutaneous trigeminal ganglion balloon compression. Symptoms had been present since six months to twenty years. The age ranged between 23 years and 73 years. All the patients had immediate relief from pain. Two had already undergone trigeminal cistern rhizolysis. One patient had foramen ovale stenosis. After the procedure, all the patients had mild to moderate degree of ipsilateral facial sensory loss which included buccal mucosa and anterior 2/3rd of the tongue. Facial dysaesthesia (anaesthesia dolorosa was seen in only one case, who had mild involvement lasting one week. Thirty patients had altered taste sensation, probably due to general somatic sensory loss. Five patients had herpes perioralis. In this study group, two patients had already undergone microvascular decompression. All the patients were followed for a period ranging from one to eighteen months. Balloon compression technique seems to be better than injection of alcohol, glycerol or radio frequency lesion. Recurrence of pain was noted in 3 patients after one year.

  10. Balloon UV Experiments for Astronomical and Atmospheric Observations

    CERN Document Server

    Sreejith, A G; Sarpotdar, Mayuresh; Nirmal, K; Ambily, S; Prakash, Ajin; Safonova, Margarita; Murthy, Jayant

    2016-01-01

    The ultraviolet (UV) window has been largely unexplored through balloons for astronomy. We discuss here the development of a compact near-UV spectrograph with ?ber optics input for balloon ights. It is a modi?ed Czerny-Turner system built using o?-the-shelf components. The system is portable and scalable to di?erent telescopes. The use of re ecting optics reduces the transmission loss in the UV. It employs an image-intensi?ed CMOS sensor, operating in photon counting mode, as the detector of choice. A lightweight pointing system developed for stable pointing to observe astronomical sources is also discussed, together with the methods to improve its accuracy, e.g. using the in-house build star sensor and others. Our primary scienti?c objectives include the observation of bright Solar System objects such as visible to eye comets, Moon and planets. Studies of planets can give us valuable information about the planetary aurorae, helping to model and compare atmospheres of other planets and the Earth. The other ma...

  11. 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.

  12. Polar Balloon Experiment for Astrophysics Research (Polar BEAR)

    Science.gov (United States)

    Bashindzhagyan, G.; Adams, James H., Jr.; Bashindzhagyan, P.; Chilingarian, A.; Donnelly, J.; Drury, L.; Egorov, N.; Golubkov, S.; Grebenyuk, V.; Kalinin, A.; Whitaker, Ann F. (Technical Monitor)

    2001-01-01

    A new balloon experiment is proposed for a long duration flight around the North Pole. The primary objective of the experiment is to measure the elemental energy spectra of high-energy cosmic rays in the region up to 10(exp 15) eV. The proposed instrument involves the combination of a large collecting area (approximately 1 x 1 square m) KLEM (Kinematic Lightweight Energy Meter) device with an ionization calorimeter having a smaller collecting area (approximately 0.5 x 0.5 square m) and integrated beneath the KLEM apparatus. This combination has several important advantages. Due to the large aperture (greater than 2 square m sr) of the KLEM device a large exposure factor can be achieved with a long duration balloon flight (2-4 weeks). The calorimeter will collect about 10% of the events already registered by KLEM and provide effective cross-calibration for both energy measurement methods. Details of the experiment and its astrophysical significance will be presented.

  13. Electrodynamics of the Middle Atmosphere: Superpressure Balloon Program

    Science.gov (United States)

    Holzworth, Robert H.

    1990-01-01

    This project called Electrodynamics of the Middle Atmosphere (EMA): Superpressure Balloon Program was begun by the PI at the Aerospace Corporation in Los Angeles under joint NSF and NASA funding originally combined in one grant ATM80-17071 and has continued at the University of Washington under grants ATM8212283, ATM84-11326 and ATM86-15628 and NASA grants NAGW-724 and NAGS-635. In the EMA experiment a comprehensive set of electrical parameters was measured during eight long-duration balloon flights in the Southern Hemisphere stratosphere. These flights resulted in the largest vector electric field data set ever collected from the stratosphere which has been a treasure-trove of new phenomena. Since the stratosphere has never been electrodynamically sampled in this systematic manner before, it is perhaps not surprising that several new discoveries have been made and reported. Another way to measure the success of this first EMA project is to note that all together the total data rate was about 1 bit/sec/payload amounting to 12 MBytes (1/3 of 1 standard 1600 BPI magnetic tape) which nevertheless has resulted in 14 papers and 2 masters theses (so far! . Ten of these papers and one masters thesis specifically acknowledge the support by NASA grant NAGS-635 are discussed herein.

  14. A case of asymptomatic fungal and bacterial colonization of an intragastric balloon

    Institute of Scientific and Technical Information of China (English)

    Halil Coskun; Suleyman Bozkurt

    2009-01-01

    Intragastric balloon therapy, as a part of a multidisciplinary weight management program, is an effective short-term intervention for weight loss. Although the insertion procedure is easy and generally well tolerated by patients, a few complications can occur. We report here a heavy smoker with intragastric balloon insertion complicated by colonization with opportunistic organisms. The 27-year-old female, body mass index 35.5 kg/m2, had a BioEnterics. Intragastric Balloon inserted under conscious sedation without any perioperative complications. Six months later, when the standard removal time arrived, the balloon was seen to be covered with a necrotic white-gray material. Microbiological examination revealed Enterobacter cloacae and Candida species yeast colonies. We recommend that asymptomatic fungal and/or bacterial colonization should be considered among the complications of the intragastric balloon procedure, despite its rarity.

  15. Vascular Rupture Caused by a Molding Balloon during Endovascular Aneurysm Repair: Case Report

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Hee Young; Do, Young Soo; Park, Hong Suk; Park, Kwang Bo [Dept. of Radiology, Samsugn Medical Center, Sungkyunkwan University School of Medicine, Seoul (Korea, Republic of); Kim, Young Wook; Kim, Dong Ik [Dept. of Surgery, Samsugn Medical Center, Sungkyunkwan University School of Medicine, Seoul (Korea, Republic of)

    2011-08-15

    Endovascular aneurysm repair (EVAR) has been accepted as an alternative to traditional open surgery in selected patients. Despite the minimally invasiveness of this treatment, several complications may occur during or after EVAR. Complications include endoleak, aortic dissection, distal embolism, or iatrogenic injury to the access artery. However, there are few reports on the vascular rupture caused by a molding balloon during EVAR. We report two cases of infrarenal abdominal aortic aneurysms complicated by procedure-related aortic or iliac artery rupture by the molding balloon during EVAR. In our cases, we observed suddenly abrupt increase of the diameter of the endograft during balloon inflation, because we inflated the balloon rapidly. In conclusion, careful attention must be paid during inflation of the molding balloon to prevent vascular rupture.

  16. Treatment of benign ureteral stricture by double J stents using high-pressure balloon angioplasty

    Institute of Scientific and Technical Information of China (English)

    YU Hua-liang; YE Lin-yang; LIN Mao-hu; YANG Yu; MIAO Rui; HU Xiao-juan

    2011-01-01

    Background Balloon dilatation angioplasty is a minimally invasive surgery for treating benign ureteral stricture. The aim of this study was to investigate the effect of placing double J (D-J) stents using high-pressure balloon angioplasty in treating benign ureteral stricture.Methods A total of 42 patients (48 cases) with benign ureteral stricture (42 had benign ureteral stricture) were investigated by inserting dual D-J stents using high-pressure balloon angioplasty. The control group contained 50 patients (57 cases) employing the conventional balloon angioplasty with a single D-J stent inserted for comparison.Results The overall effective rate of the treated and control groups was 87.8% (36/41) and 62.7% (32/51), respectively (P <0.05).Conclusion This new approach produces a better curative effect than the conventional balloon angioplasty with a single D-J stent insertion in treating benign ureteral stricture.

  17. Astrobiology Exploration Strategies for the Mars Polar Regions Using Balloon Platforms

    Science.gov (United States)

    Mahaffy, P. R.; Atreya, S. A.; Fairbrother, D. A.; Farrell, W. M.; Gorevan, S.; Jones, J.; Mitrofanov, I.; Scott, J.

    2003-01-01

    Montgolfiere balloons can provide a unique near-surface platform for an extended traverse over the polar regions of Mars. During the polar summer, such solar powered balloons would remain in the constant sun of the polar summer and could remain airborne for many weeks or even months as the atmospheric circulation would drive the balloons around the polar region many times before the balloon would cross the terminator. Such a platform for scientific measurements could provide in situ sampling of the atmosphere for trace disequilibrium species that might be indicators of present geological or biological activity in this regon. It could furthermore provide high resolution imaging, deep electromagnetic (EM) sounding for subsurface stratigraphy and liquid water, and high spatial resolution neutron measurements of subsurface ice. Technologies for robust balloon deployment on entry and controlled encounters with the surface and near subsurface for sample acquisition in otherwise inaccessible regions are presently being studied and developed with support from NASA.

  18. 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.

  19. Safety and effectiveness of gastric balloons associated with hypocaloric diet for the treatment of obesity

    Directory of Open Access Journals (Sweden)

    M.ª Luisa de Castro

    2013-10-01

    Full Text Available Introduction: intragastric balloons provide early satiety and thereby induce short-term weight loss. The aim of this study was to evaluate safety and short and medium-term effectiveness of gastric balloons associated to hypocaloric diet in obesity. Material and methods: from May 2004 to June 2011 91 obese patients, body mass index [BMI] 45.2 ± 7.2 kg/m² were prospectively followed after endoscopic implantation of a gastric balloon associated to restricted diet. Successful therapy was defined as percent loss of total weight (%LTW ≥ 5% at six months after balloon placement and 6 and 12 months after their withdrawal. All analyses followed intention-to treat principles considering significant p-values < 0.05. Results: we placed 73 fluid-filled balloons (80.2% and 18 air-filled ones (19.8%. Compared to baseline values, at 6-month 73.7% subjects succeeded, showing significant reductions in weight (13.3 ± 8.8 kg, BMI (5 ± 3.4 kg/m² (p < 0.0001, with% LTW 11 ± 7%. Six and twelve months after retrieval 45.1% and 28.6% patients reached% LTW ≥ 5%. Short-term and medium-term effectiveness was negatively associated to obesity in first-grade relatives (p = 0.003 and p = 0.04. Higher weight loss 6 months after balloon placement independently predicted medium-term effectiveness (p = 0.0001. Mortality was absent but there were two spontaneous deflations of air-filled balloons and severe withdrawal difficulties in 8 patients, leading to surgery in one case. Retrieval complications associated to air-filled balloons (p = 0.0005. Conclusions: in obesity, effectiveness of gastric balloons associated to hypocaloric diet decreases over time. Complications occurred mainly in the retrieval endoscopic procedure and related to air-filled balloons.

  20. Kinetic Ballooning Instability as a Substorm Onset Mechanism

    International Nuclear Information System (INIS)

    A new scenario of substorm onset and current disruption and the corresponding physical processes are presented based on the AMPTE/CCE spacecraft observation and a kinetic ballooning instability theory. During the growth phase of substorms the plasma beta is larger than unity (20 greater than or equal to beta greater than or equal to 1). Toward the end of the late growth phase the plasma beta increases from 20 to greater than or equal to 50 in approximately 3 minutes and a low-frequency instability with a wave period of 50 - 75 sec is excited and grows exponentially to a large amplitude at the current disruption onset. At the onset, higher-frequency instabilities are excited so that the plasma and electromagnetic field form a turbulent state. Plasma transport takes place to modify the ambient pressure profile so that the ambient magnetic field recovers from a tail-like geometry to a dipole-like geometry. A kinetic ballooning instability (KBI) theory is proposed to explain the low-frequency instability (frequency and growth rate) and its observed high beta threshold (beta subscript c is greater than or equal to 50). Based on the ideal-MHD theory beta subscript c, superscript MHD approximately equals 1 and the ballooning modes are predicted to be unstable during the growth phase, which is inconsistent with observation that no appreciable magnetic field fluctuation is observed. The enhancement beta subscript c over beta subscript c, superscript MHD is due to the kinetic effects of trapped electrons and finite ion-Larmor radii which provide a large stabilizing effect by producing a large parallel electric field and hence a parallel current that greatly enhances the stabilizing effect of field line tension. As a result, beta subscript c is greatly increased over beta subscript c, superscript MHD by a factor proportional to the ratio of the total electron density to the untrapped electron density (n subscript e divided by n subscript eu) which is greater than or equal to

  1. The balloon-borne large aperture submillimeter telescope

    Science.gov (United States)

    Truch, Matthew David Patey

    The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) is designed to produce large (1-100 deg 2 ) maps of the sky at 250, 350, and 500 pm. The balloon platform lifts BLAST above most of the atmosphere, which is nearly opaque in the submillimeter, making BLAST significantly more sensitive than existing ground-based submillimeter telescopes. BLAST has had three successful flights on a high-altitude balloon. This thesis is in three parts. In the first part, the design, construction, and operation of BLAST is described in detail. Specifically, the submillimeter telescope and receiver, the cryogenic system, the various pointing sensors, and the command and control systems are covered. The processes of launching and landing the gondola are also discussed. In the second part, the analysis of BLAST data is discussed, and specifically data from the BLAST05 flight. The process of cleaning and preparing bolometer time-streams for map-making is discussed. The process of calibrating the data, flat-fielding the bolometer responsivity, removing time-varying changes in bolometer responsivity, and absolute flux calibration based on the fluxes of a known astronomical submillimeter source is detailed. Reconstructing the pointing solution from the data from the in-flight pointing sensors is discussed. Finally, combining the calibrated bolometer data with the reconstructed pointing solution to generate maps is described. In the third part, BLAST05 flight data and results are presented. Several compact sources were mapped, including solar system, Galactic, and extragalactic targets. These included Pallas and Saturn in the solar system, K3-50, W 75N, IRAS 20126+4104, CRL 2688, IRAS 21078+5211, LDN 1014, IRAS 21307+5049, IRAS 22134+5834, and IRAS 23011+6126 in the Galaxy, and the galaxies NGC 4565, Mrk 231, and Arp 220. Fluxes and spectral energy distributions (SEDs) of each of these sources at the BLAST wavelengths are presented, and these are compared with previous

  2. Collection of Stratospheric Samples using Balloon-Borne Payload System

    Science.gov (United States)

    Prakash, Ajin; Safonova, Margarita; Murthy, Jayant; Sreejith, A. G.; Kumble, Sheshashayi; Mathew, Joice; Sarpotdar, Mayuresh; Kj, Nirmal; Suresh, Ambily; Chakravortty, Dipshikha; Rangarajan, Annapoorni

    2016-07-01

    Earth's atmosphere at stratospheric altitudes contains dust particles from soil lifted by weather, volcanic dust, man-made aerosols, IDP (Interplanetary Dust Particles) - remnants of comets and asteroids, and even interstellar dust. Satellite observations suggest that approximately 100--300 tons of cosmic dust enter Earth's atmosphere every day. However, very little is known about the microbial life in the upper atmosphere, where conditions are very much similar to that on Mars and possibly on some exoplanets. Stratosphere provides a good opportunity to study the existence or survival of biological life in these conditions. Despite the importance of this topic to astrobiology, stratospheric microbial diversity/survival remains largely unexplored, probably due to significant difficulties in the access and ensuring the absence of contamination of the samples. To conduct a detailed study into this, we are developing the balloon-borne payload system SAMPLE (Stratospheric Altitude Microbiology Probe for Life Existence) to collect dust samples from stratosphere and bring them in an hygienic and uncontaminated manner to a suitable laboratory environment, where further study will be conducted to establish the possibility of microbial life in the upper atmosphere. This balloon-borne payload system will rise through the atmosphere till it reaches an altitude of about 25-30 km above sea level. The payload consists of detachable pre-sterilized sampling chambers designed to collect and contain the dust samples and get them back to the surface without contamination during the flight, a microprocessor and a controller which will determine the altitude of the payload system to actively monitor the opening and closing of the sample collection chambers. For contamination control, we will have two extra chambers, one of which will fly but not open, and one will remain closed on the ground. Other onboard devices include environmental sensors, GPS tracking devices, cameras to monitor

  3. 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

    In Japan, the high altitude balloon for scientific observation has been continuously launched by JAXA. The balloon has a possibility to reach 50 km altitude without tight environmental condition for onboard equipments, operating with a cost lower than sounding rockets, however, development of the large-scale scientific observation balloons by university laboratories is still difficult. Being coupled with recent improvement of semiconductor sensors, laboratory-basis balloon experiments using small weather balloons has been becoming easily in these years. Owing to an advantage of wide land fields in continental regions, the launch of such small balloons has become to be carried out many times especially in continental countries (e.g. Near Space Ventures, Inc., 2013). Although the balloon is very small as its diameter of 6 feet, excluding its extra buoyancy and the weight of the balloon itself, it is expected that about 2 kg loading capacity is remained for payloads to send it up to about 35 km altitude. However, operation of such balloons in Japan is not in general because precise prediction of a landing area of the payload is difficult, thus high-risk situation for balloon releases is remained. In this study, we aim to achieve practical engineering experiments of weather balloons in Japan to be used for scientific observation within university laboratory level as an educational context. Here we report an approach of developing many devices for a small tethered balloon currently in progress. We evaluated an accuracy of altitude measurement by using a laboratory developed altitude data logger system that consists of a GPS-module and a barometric altimeter. Diameter of the balloon was about 1.4 m. Being fulfilled with about 1440 L helium, it produced buoyancy of about 15.7 N. Taking into account of total weight including the mooring equipments, available payload mass becomes to be about 1100 g. Applying an advantage of a 3D printer of FDM (Fused Deposition Modeling

  4. 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.

  5. Therapeutic enema for pediatric ileocolic intussusception: using a balloon catheter improves efficacy.

    Science.gov (United States)

    Betz, Bradford W; Hagedorn, Jeffrey E; Guikema, Jeffrey S; Barnes, Courtney L

    2013-10-01

    A therapeutic enema for pediatric intussusception may benefit by using a rectal catheter with an inflated balloon. We compared the efficacy of rectal catheters without and with an inflated balloon for air and liquid enemas. We retrospectively reviewed PACS images and hospital records of children who had a therapeutic enema for intussusception at our institution between January 2006 and May 2011. Sixty-two enemas in 60 children were included. Physician assistants with training in pediatric fluoroscopy and pediatric radiologists were more likely to use air enema (37/41 or 90 %), and general radiologists were more likely to use liquid enema (18/21 or 86 %). However, the reduction rate for air enema overall was only slightly higher than for liquid enema using an inflated balloon catheter (36/40 or 90 % versus 14/17 or 82 %) (P=0.653). For air enema, mean procedure time for successful reductions was shorter with an inflated balloon catheter than with a plastic catheter (7.6 versus 28.2 min) (Pinflated balloon catheter than without inflation (14/17 or 82 % versus 1/5 or 20 %; P=0.021), but the procedure time was not shortened. No procedural complications were directly attributed to using a rectal catheter with an inflated balloon. Using a rectal catheter with an inflated balloon appears to safely shorten the procedure time of a successful air enema and improve the reduction rate of liquid enema. PMID:23748969

  6. Diagnostic yield of brush cytology for biliary stenosis during ERCP Rentabilidad diagnóstica de la citología por cepillado de las estenosis biliares durante la CPRE

    Directory of Open Access Journals (Sweden)

    R. Temiño López-Jurado

    2009-06-01

    Full Text Available Aim: to evaluate the diagnostic yield of brush cytology for biliary strictures detected on ERCP when a systematic approach is used. Patients and methods: data on 62 consecutive patients with a biliary stricture on ERCP were collected. Cytological samples were processed immediately after brushing in the endoscopy room, and all were analyzed by the same pathologist. For the statistical analysis specimens were classified as positive, negative, suspicious for malignancy (presence of atypias, and unsatisfactory for evaluation. Final diagnosis was based on either histopathologic (surgery or biopsies by other techniques or clinical/radiographic diagnosis. Results: a total of 71 cytological specimens were included. Definite diagnosis was malignancy in 49 samples, and benign stricture in 22. Three samples were excluded because of insufficient material or processing artifacts. The sensitivity of biliary brushing was 62% (95% CI 0.47-0.77, specificity was 100%, positive predictive value was 100%, and negative predictive value was 58% (95% CI 0.43-0.75. When suspicious samples were included as malignant, sensitivity was 67% (95% CI 0.54-0.81 without changes in the remaining parameters. Eight patients underwent more than one ERCP. Repeated brush cytology exams in these patients yielded a definitive diagnosis in every case. Conclusions: brush cytology has intermediate sensitivity with a high specificity. A systematic approach with a dedicated pathologist and the inclusion of significant atypias as malignant results improves sensitivity. Due to its simplicity brush cytology should be performed in all cases of biliary strictures detected on ERCP, and in case of repeated ERCPs additional cytology brushings are recommended.Objetivo: evaluar la rentabilidad de la citología por cepillado de las estenosis biliares diagnosticadas por CPRE cuando se aplica una metodología sistemática. Pacientes y métodos: se recogieron muestras de 62 pacientes consecutivos con

  7. Fine tracking system for balloon-borne telescopes

    CERN Document Server

    Ricci, M; Lorenzetti, D

    2011-01-01

    We present the results of a study along with a first prototype of a high precision system (? 1 arcsec) for pointing and tracking light (near-infrared) telescopes on board stratospheric balloons. Such a system is essentially composed by a star sensor and by a star tracker, able to recognize the field and to adequately track the telescope, respectively. We present the software aimed at processing the star sensor image and the predictive algorithm that allows the fine tracking of the source at a sub-pixel level. The laboratory tests of the system are described and its performance is analyzed. We demonstrate how such a device, when used at the focal plane of enough large telescopes (2-4m, F/10), is capable to provide (sub-)arcsec diffraction limited images in the near infrared bands.

  8. Reflood Phenomena in a 5 x 5 Ballooned Rod Bundle

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Byoung Jae; Kim, Jong Rok; Kim, Kihwan; Moon, S. K. [KAERI, Daejeon (Korea, Republic of)

    2015-05-15

    Various experimental programs were carried out for the coolability of an assembly containing a partial blockage in a group of ballooned fuel rods under LOCA conditions. A review on these experimental programs is well documented in. One key distinguished feature of KAERI research activities is the consideration of local power increase owing to fuel relocation, whereas the past experimental program did not consider the effect of fuel relocation. The purpose of this study is to investigate the reflood phenomena in the partial blocked 5 x 5 rod bundle. A series of the forced reflood tests were performed with/without consideration of local power increase by fuel relocation. The experimental data were evaluated with numerical predictions using MARS code. The flow blockage alone has little effect on the peak wall temperature. However, the local power increase by fuel relocation affects considerably the peak wall temperature and the time period during which high wall temperatures continue.

  9. Prototype TIGRE Compton γ-ray balloon-borne telescope

    Science.gov (United States)

    Bhattacharya, D.; O'Neill, T. J.; Akyüz, A.; Samimi, J.; Zych, A. D.

    2004-02-01

    A prototype balloon-borne telescope is being constructed for γ-ray observations in the MeV energy range. The Tracking and Imaging Gamma-Ray Experiment (TIGRE) uses multi-layers of thin silicon detectors to track and measure the energy losses of Compton recoil electrons. When combined with the direction and energy of the Compton scattered γ-ray a unique incident direction for each photon event is determined. This facilitates background rejection, improved sensitivity and image reconstruction. The converter/tracker also serves as an electron-positron pair detector for γ-rays up to 100 MeV. The initial continental US flight will be used to determine the sub-orbital atmospheric backgrounds and search for polarized γ-emission for the Crab pulsar. Longer southern hemisphere flights with an enhanced instrument will map out the 26Al emissions from the galactic center region.

  10. Neutral beam effects on tokamak ballooning mode stability

    International Nuclear Information System (INIS)

    An equation is derived that gives a necessary, as well as sufficient, stability criterion for the guiding center plasma to instabilities of large toroidal mode number. It is found that quasi-perpendicular injection induces a displacement of the psub(perpendicular to) contours with respect to the flux surfaces away from the destabilizing curvature region, which enhances the stability of tensor pressure equilibria over comparable scalar pressure equilibria. Also found is a distinct difference between the necessary and sufficient stability limits when the most unstable modes concentrate in regions of relatively high pressure. Both stability criteria coalesce when ballooning modes, which appear near the edge of the plasma where the pressure is low, dominate. (author)

  11. Absence of Bacteria on Coronary Angioplasty Balloons from Unselected Patients

    DEFF Research Database (Denmark)

    Hansen, Gorm Mørk; Nilsson, Martin; Nielsen, Claus Henrik;

    2015-01-01

    Periodontitis is a chronic, bacterially-induced inflammatory disease of the tooth-supporting tissues, which may result in transient bacteremia and a systemic inflammatory response. Periodontitis is associated with coronary artery disease independently of established cardiovascular risk factors......, and translocation of bacteria from the oral cavity to the coronary arteries may play a role in the development of coronary artery disease. Very few studies have used angioplasty balloons for in vivo sampling from diseased coronary arteries, and with varying results. Therefore, the aim of this study was to assess...... patients with stable angina, unstable angina/non-ST elevation myocardial infarction, and ST-elevation myocardial infarction (n = 15 in each group) were collected and analyzed using a PCR assay with high sensitivity and specificity for 16S rRNA genes of the oral microbiome. Despite elimination of extraction...

  12. Reflood Phenomena in a 5 x 5 Ballooned Rod Bundle

    International Nuclear Information System (INIS)

    Various experimental programs were carried out for the coolability of an assembly containing a partial blockage in a group of ballooned fuel rods under LOCA conditions. A review on these experimental programs is well documented in. One key distinguished feature of KAERI research activities is the consideration of local power increase owing to fuel relocation, whereas the past experimental program did not consider the effect of fuel relocation. The purpose of this study is to investigate the reflood phenomena in the partial blocked 5 x 5 rod bundle. A series of the forced reflood tests were performed with/without consideration of local power increase by fuel relocation. The experimental data were evaluated with numerical predictions using MARS code. The flow blockage alone has little effect on the peak wall temperature. However, the local power increase by fuel relocation affects considerably the peak wall temperature and the time period during which high wall temperatures continue

  13. 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}.

  14. Long distance cell communication using spherical tether balloons

    Science.gov (United States)

    Manchanda, R. K.; Rajagopalan, Vasudevan; Vasudevan, Rajagopalan; Mehrotra, R. K.; Sreenivasan, S.; Pawaskar, M.; Subba Rao Jonnalagadda, Venkata; Buduru, Suneelkumar; Kulkarni, P. M.

    A proof-of-concept experiment was conducted for long-range cell communication for rural tele-phony and internet. We designed and fabricated a spherical tether balloon to carry the con-ventional micro base transceiver station (BTS) along with three slotted antenna to cover 2-pi radius. AC power and optical fiber were anchored along with the tether line. A special fre-quency license was obtained from Wireless Planning Commission (WPC) wing of Department of Telecommunication (DoT), India for the period of experiment so as not to affect the opera-tional networks. The experiments were carried out for different BTS heights up to 500 meter. Signal measurement both in data mode and voice quality were done in different quadrant using mobile vans. This paper describes the methodology (under patenting) and utility of technique for operational application.

  15. Ballooning of CANDU pressure tubes - experiments with degraded tube material

    International Nuclear Information System (INIS)

    Three as-received Zr-2.5% Nb pressure tube specimens and three specimens with eight 0.5 mm deep defects machined on the inside surface were tested in the ballooning test rig at Stern Laboratories Inc. The temperature ramp rate was controlled between 28 K s-1 and 35 K s-1. Temperatures on the outside and inside surfaces of the specimens, and circumferential and longitudinal strains were recorded during the transients. Post-test longitudinal, circumferential and wall thickness strains were measured. All as-received specimens ruptured full-length near the top, i.e., the hottest point. All defected specimens failed at either or both upper defects, one rupture being full-length and the others limited to one to three times the length of the defect. (author). 4 refs., 2 tabs., 15 figs

  16. Initial Results from the ANITA 2006-2007 Balloon Flight

    Energy Technology Data Exchange (ETDEWEB)

    Gorham, P.W.; /Hawaii U.; Allison, P.; /Hawaii U.; Barwick, S.W.; /UC, Irvine; Beatty, J.J.; /Ohio State U.; Besson, D.Z.; /Kansas U.; Binns, W.R.; /Washington U., St. Louis; Chen, C.; /SLAC; Chen, P.; /SLAC; Clem, J.M.; /Delaware U.; Connolly, A.; /University Coll. London; Dowkontt, P.F.; /Washington U., St. Louis; DuVernois, M.A.; /Minnesota U.; Field, R.C.; /SLAC; Goldstein, D.; /UC, Irvine; Goodhue, A.; /UCLA; Hast, C.; /SLAC; Hebert, C.L.; /Hawaii U.; Hoover, S.; /UCLA; Israel, M.H.; /Washington U., St. Louis; Kowalski, J.; /Hawaii U.; Learned, J.G.; /Hawaii U. /Caltech, JPL /Hawaii U. /Minnesota U. /Hawaii U. /Ohio State U. /Hawaii U. /Hawaii U. /UC, Irvine /Taiwan, Natl. Taiwan U. /Caltech, JPL /SLAC /University Coll. London /Ohio State U. /SLAC /Hawaii U. /Hawaii U. /Hawaii U. /UCLA /Delaware U. /Hawaii U. /SLAC /Taiwan, Natl. Taiwan U. /UC, Irvine

    2011-11-16

    We report initial results of the Antarctic Impulsive Transient Antenna (ANITA) 2006-2007 Long Duration Balloon flight, which searched for evidence of the flux of cosmogenic neutrinos. ANITA flew for 35 days looking for radio impulses that might be due to the Askaryan effect in neutrino-induced electromagnetic showers within the Antarctic ice sheets. In our initial high-threshold robust analysis, no neutrino candidates are seen, with no physics background. In a non-signal horizontal-polarization channel, we do detect 6 events consistent with radio impulses from extensive air showers, which helps to validate the effectiveness of our method. Upper limits derived from our analysis now begin to eliminate the highest cosmogenic neutrino models.

  17. Static and quasi-static analysis of lobed-pumpkin balloon

    Science.gov (United States)

    Nakashino, Kyoichi; Sasaki, Makoto; Hashimoto, Satoshi; Saito, Yoshitaka; Izutsu, Naoki

    The present study is motivated by the need to improve design methodology for super pressure balloon with 3D gore design concept, currently being developed at the Scientific Balloon Center of ISAS/JAXA. The distinctive feature of the 3-D gore design is that the balloon film has excess materials not only in the circumferential direction but also in the meridional direction; the meridional excess is gained by attaching the film boundaries to the corresponding tendons of a shorter length with a controlled shortening rate. The resulting balloon shape is a pumpkin-like shape with large bulges formed between adjacent tendons. The balloon film, when fully inflated, develops wrinkles in the circumferential direction over its entire region, so that the stresses in the film are limited to a small amount of uniaxial tension in the circumferential direction while the high meridional loads are carried by re-enforced tendons. Naturally, the amount of wrinkling in the film is dominated by the shortening rate between the film boundaries and the tendon curve. In the 3-D gore design, as a consequence, the shortening rate becomes a fundamental design parameter along with the geometric parameters of the gore. In view of this, we have carried out a series of numerical study of the lobed-pumpkin balloon with varying gore geometry as well as with varying shortening rate. The numerical simula-tions were carried out with a nonlinear finite element code incorporating the wrinkling effect. Numerical results show that there is a threshold value for the shortening rate beyond which the stresses in the balloon film increases disproportionately. We have also carried out quasi-static simulations of the inflation process of the lobed-pumpkin balloon, and have obtained asymmetric deformations when the balloon films are in uniaxial tension state.

  18. 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.

  19. Hands-on Space Exploration through High Altitude Ballooning

    Science.gov (United States)

    Hammergren, Mark; Gyuk, G.

    2010-01-01

    The Adler Planetarium's "Far Horizons" high-altitude ballooning effort serves as the focus for a diverse set of educational activities, including middle school summer camps, a high school summer program (the Astro-Science Workshop), school-year internships for high school students, summer internships for undergraduates, a NSF-funded graduate fellowship, and a thriving public volunteer program. The relatively low costs of both the reusable hardware (less than $1000) and expendable supplies (around $150 per launch) allow us to mount frequent missions throughout the year - and make such a program ideal for replication at institutions of any size. The rapid development schedule for each individual mission permits the cradle-to-grave involvement of short-term participants, making it easy to draw in a wide audience. Students are involved literally in a hands-on manner in all aspects of the construction, launch, tracking, and recovery of simple experimental payloads, which typically include sensors for temperature, pressure, light intensity, and radiation. Stunning imagery provided by onboard cameras can attract significant media interest, which can bring outreach efforts to a very broad audience. Future plans include the design and construction of CubeSats - decimeter-sized picosatellites carried to orbit as secondary payloads. Our first satellite will be a relatively simple Earth-imager, built from commercial, off-the-shelf components. As in the ballooning program, students and volunteers will be involved in all stages of this effort. Once operational, imagery and other data from the satellite will be incorporated into a museum exhibit that will allow visitors to submit target requests. This material is based in part upon work supported by the National Science Foundation under Grant No. 0525995.

  20. Coordinated weather balloon solar radiation measurements during a solar eclipse

    Science.gov (United States)

    2016-01-01

    Solar eclipses provide a rapidly changing solar radiation environment. These changes can be studied using simple photodiode sensors, if the radiation reaching the sensors is unaffected by cloud. Transporting the sensors aloft using standard meteorological instrument packages modified to carry extra sensors, provides one promising but hitherto unexploited possibility for making solar eclipse radiation measurements. For the 20 March 2015 solar eclipse, a coordinated campaign of balloon-carried solar radiation measurements was undertaken from Reading (51.44°N, 0.94°W), Lerwick (60.15°N, 1.13°W) and Reykjavik (64.13°N, 21.90°W), straddling the path of the eclipse. The balloons reached sufficient altitude at the eclipse time for eclipse-induced variations in solar radiation and solar limb darkening to be measured above cloud. Because the sensor platforms were free to swing, techniques have been evaluated to correct the measurements for their changing orientation. In the swing-averaged technique, the mean value across a set of swings was used to approximate the radiation falling on a horizontal surface; in the swing-maximum technique, the direct beam was estimated by assuming that the maximum solar radiation during a swing occurs when the photodiode sensing surface becomes normal to the direction of the solar beam. Both approaches, essentially independent, give values that agree with theoretical expectations for the eclipse-induced radiation changes. This article is part of the themed issue ‘Atmospheric effects of solar eclipses stimulated by the 2015 UK eclipse’. PMID:27550757

  1. Coordinated weather balloon solar radiation measurements during a solar eclipse.

    Science.gov (United States)

    Harrison, R G; Marlton, G J; Williams, P D; Nicoll, K A

    2016-09-28

    Solar eclipses provide a rapidly changing solar radiation environment. These changes can be studied using simple photodiode sensors, if the radiation reaching the sensors is unaffected by cloud. Transporting the sensors aloft using standard meteorological instrument packages modified to carry extra sensors, provides one promising but hitherto unexploited possibility for making solar eclipse radiation measurements. For the 20 March 2015 solar eclipse, a coordinated campaign of balloon-carried solar radiation measurements was undertaken from Reading (51.44°N, 0.94°W), Lerwick (60.15°N, 1.13°W) and Reykjavik (64.13°N, 21.90°W), straddling the path of the eclipse. The balloons reached sufficient altitude at the eclipse time for eclipse-induced variations in solar radiation and solar limb darkening to be measured above cloud. Because the sensor platforms were free to swing, techniques have been evaluated to correct the measurements for their changing orientation. In the swing-averaged technique, the mean value across a set of swings was used to approximate the radiation falling on a horizontal surface; in the swing-maximum technique, the direct beam was estimated by assuming that the maximum solar radiation during a swing occurs when the photodiode sensing surface becomes normal to the direction of the solar beam. Both approaches, essentially independent, give values that agree with theoretical expectations for the eclipse-induced radiation changes.This article is part of the themed issue 'Atmospheric effects of solar eclipses stimulated by the 2015 UK eclipse'. PMID:27550757

  2. Characteristic mechanical properties of balloon-expandable peripheral stent systems

    International Nuclear Information System (INIS)

    Purpose: To measure in vitro geometric-mechanical characteristics of balloon-expandable peripheral stent systems for determining suitability for specific vascular regions. Materials and Methods: Balloon-expandable stents including their delivery systems manufactured by Guidant (OTW MegalinkTM), Inflow Dynamics (Antares), Medtronic (AVE BridgeTM), Biotronik (PeironTM) and Cordis (Corinthian IQTM) were selected for this study. When expanded, all stents had a nominal diameter of 8 mm. The length was 38-40 mm. Stent profile, trackability, length change on expansion, stiffness, elastic recoil, and radio-opacity in the crimped and expanded state of these stent systems were determined with specially developed test methods. Results: The Corinthian IQTM, MegalinkTM and PeironTM required the smallest force to pass through the vascular model. While the BridgeTM system had the largest profile with a diameter of 2.430 mm, all other stent systems had a significantly smaller diameter ranging from 1.970 mm for the PeironTM to 2.078 mm for the Corinthian IQTM. In the distal region of the stent delivery system, the MegalinkTM was the most flexible and the BridgeTM system the stiffest. Elastic recoil for all stents was in the range of 2.5% to 3.5%, with the exception of the BridgeTM stent, which had an elastic recoil of 4.79%. The Corinthian IQTM stent had noticeably the highest radial stiffness. In the expanded condition, the PeironTM was the most flexible while the Corinthian IQTM and AntaresTM were found to be the stiffest. Length change (shrinkage on expansion) ranged from 0.54 to 6.57%, with the exception of the Corinthian IQ, which shrunk >7 mm (18.5%) on expansion. All stent systems in the crimped and expanded state were readily visible radiographically. (orig.)

  3. Balloon catheter dilatation of esophageal strictures in children and an infant

    Energy Technology Data Exchange (ETDEWEB)

    Yeon, Kyung Mo; Choe, Yeon Hyeon; Kim, In One [Seoul National University College of Medicine, Seoul (Korea, Republic of)

    1986-10-15

    Severe postoperative strictures in two children and an infant and mild postoperative stricture in a child were treated with balloon catheter. A child with post-fundoplication stricture showed symptomatic improvement. Anastomotic strictures after esophageal atresia repair in an infant and a child were successfully dilated with improved luminal diameter and symptoms. In a child with mild postoperative stricture, balloon dilatation was performed to prevent stricture of the anastomotic site. Radiological esophageal dilatation using balloon catheters is a safe effective method for dilating symptomatic esophageal strictures which obviates surgery and allows subsequent standard bougienage.

  4. Randomised comparison of coronary stenting with and without balloon predilatation in selected patients

    OpenAIRE

    Le Breton, H; Boschat, J; Commeau, P; Brunel, P.; Gilard, M; Breut, C; Bar, O.; Geslin, P; Tirouvanziam, A; Maillard, L.; Moquet, B; Barragan, P.; Dupouy, P.; Grollier, G; Berland, J.

    2001-01-01

    BACKGROUND—The SWIBAP (stent without balloon predilatation) prospective randomised trial was designed to compare direct coronary stenting with stenting preceded by lesion predilatation with an angioplasty balloon.
OBJECTIVE—To determine the feasibility and safety of direct stenting in non-complex coronary lesions in a prospective study.
PATIENTS AND DESIGN—All patients  3.0 mm, who granted their informed consent, were randomised into the trial. In group I, the stent was placed without balloon...

  5. Ruptured high flow gastric varices with an intratumoral arterioportal shunt treated with balloon-occluded retrograde transvenous obliteration during temporary balloon occlusion of a hepatic artery

    Institute of Scientific and Technical Information of China (English)

    Motoki Nakai; Morio Sato; Hirohiko Tanihata; Tetsuo Sonomura; Shinya Sahara; Nobuyuki Kawai; Masashi Kimura; Masaki Terada

    2006-01-01

    A patient presented with hematemesis due to gastric variceal bleeding with an intratumoral arterioportal shunt. Contrast-enhanced CT revealed gastric varices and hepatocellular carcinoma with tumor thrombi in the right portal vein. Angiography and angio-CT revealed a marked intratumoral arterioportal shunt accompanied with reflux into the main portal vein and gastric varices. Balloon-occluded retrograde venography from the gastro-renal shunt showed no visualization of gastric varices due to rapid blood flow through the intratumoral arterioportal shunt. The hepatic artery was temporarily occluded with a balloon catheter to reduce the blood flow through the arterioportal shunt, and then concurrent balloon-occluded retrograde transvenous obliteration (BRTO) was achieved. Vital signs stabilized immediately thereafter, and contrast-enhanced CT revealed thrombosed gastric varices. Worsening of hepatic function was not recognized. BRTO combined with temporary occlusion of the hepatic artery is a feasible interventional procedure for ruptured high flow gastric varices with an intratumoral arterioportal shunt.

  6. The prevention and management of complications during and immediately after percutaneous balloon mitral valvuloplasty

    International Nuclear Information System (INIS)

    Objective: To approach the cause and treatment of complication during and immediately after percutaneous balloon mitral valvuloplasty. Methods: One thousand three hundred and eleven patients with mitral stenosis were treated by percutaneous transseptal balloon mitral valvuloplasty. Among them, 42 patients with complications were retrospectively analyzed. Results: The overall complications rate was 3.2% (42/1311) including atrial fibrillation 0.8% (10/1311), acute pericardial tamponade 0.31% (4/1311), severe mitral insufficiency 0.46% (6/1311), femoral arterial venous fistula 0.69% (9/1311), acute pulmonary edema and iatrogenic atrial septal defect 0.23% (3/1311), respectively. Coronary air embolism, arterial thrombosis and transient cerebrovascular accident was 0.15% (2/1311) for every other one. Balloon rupture was 0.08%(1/1311). Conclusions: The complications of percutaneous balloon mitral valvuloplasty rarely occur. It is a safe and efficient nonsurgical method for treating rheumatic mitral stenosis

  7. Demonstrating Classical Conditioning in Introductory Psychology: Needles Do Not Always Make Balloons Pop!

    Science.gov (United States)

    Vernoy, Mark W.

    1987-01-01

    Describes a method of teaching classical conditioning to an introductory psychology class which involves demonstrating the conditioned response that occurs when a needle pierces, but does not pop, a balloon. (GEA)

  8. Ballooning instability of the earth's plasma sheet region in the presence of parallel flow

    Science.gov (United States)

    Lakhina, G. S.; Hameiri, E.; Mond, M.

    1990-01-01

    Stability of the plasma sheet and plasma sheet boundary layer against the ballooning mode instability is investigated. The equilibrium state of a two-dimensional plasma sheet configuration with parallel sheared flow is modeled. This equilibrium is shown to be ballooning unstable when delta-W is not positive definite, where delta-W is the potential energy. The eigenmode structure of the ballooning mode is found by imposing the boundary conditions that the waves are totally reflected from the ionosphere, and that no waves are coming in from infinity. The eigenmode structure of the unstable balloning modes is highly oscillatory, extending beyond about 100 R(E). The ballooning modes are thus a possible candidate for explaining the MHD waves and other dynamical events observed in the magnetotail by ISEE 3 and other spacecraft.

  9. 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.

  10. Balloon-Borne, High-Energy Astrophysics: Experiences from the 1960s to the 1980s

    Science.gov (United States)

    Fishman, Gerald J.

    2008-01-01

    Observational high-energy astrophysics in the hard-x-ray and gamma-ray regions owes its development and initial successes to the balloon-borne development of detector systems, as well as pioneering observations, primarily in the timeframe from the 1960s to the 1990s. I will describe some of the first observations made by the Rice University balloon group in the 1960s, including the impetus for these observations. The appearance of SN 1987a led to several balloon-flight campaigns, sponsored by NASA, from Alice Springs, Australia in 1987 and 1988. During the 1980s, prototypes of instruments for the Compton Gamma Ray Observatory were flown on many balloon flights, which greatly enhanced the success of that mission.

  11. Sub-Scale Re-entry Capsule Drop via High Altitude Balloons Project

    Data.gov (United States)

    National Aeronautics and Space Administration — High-altitude balloon flights are an inexpensive method used to lift payloads to high altitudes. Federal Aviation Administration (FAA) regulations permit payloads...

  12. Novel Ultralow-Weight Metal Rubber Sensor System for Ultra Long-Duration Scientific Balloons Project

    Data.gov (United States)

    National Aeronautics and Space Administration — NanoSonic proposes to develop an innovative, ultralow mass density, and non-intrusive sensor system for ultra long duration balloons that will operate in the most...

  13. Integrating BalloonSAT and Atmospheric Dynamic Concepts into the Secondary Classroom

    Science.gov (United States)

    Fong, B. N.; Kennon, J. T.; Roberts, E.

    2016-05-01

    Arkansas BalloonSAT is an educational outreach and scientific research program that is part of Arkansas State University in Jonesboro, AR. The following is a unit of instruction to incorporate BalloonSAT measurements into secondary science classes. Students interpret graphs and identify several atmospheric trends and properties of a typical balloon flight. Students engage critical thinking skills in developing and answering their own questions relevant to the BalloonSAT program. Prerequisite concepts students should know are how to interpret graphs and unit conversions. Students should have a basic understanding of gravity, units of temperature and distance, and error in measurements. The unit is designed for one week after end-of-course exams and before the end of school. The unit may take two to five 50-minute periods, depending on how many activities are completed.

  14. Induced Radioactivity Measured in a Germanium Detector After a Long Duration Balloon Flight

    Science.gov (United States)

    Starr, R.; Evans, L. G.; Floyed, S. R.; Drake, D. M.; Feldman, W. C.; Squyres, S. W.; Rester, A. C.

    1997-01-01

    A 13-day long duration balloon flight carrying a germanium detector was flown from Williams Field, Antartica in December 1992. After recovery of the payload the activity induced in the detector was measured.

  15. Environmental effects of the US Antarctic Program`s use of balloons in Antarctica

    Energy Technology Data Exchange (ETDEWEB)

    McCold, L.N.; Eddlemon, G.K.; Blasing, T.J.

    1995-06-01

    The USAP uses balloons in Antarctica to conduct scientific research, to facilitate safe air transport, and to provide data for global weather predictions. However, there is the possibility that balloons or their payloads may adversely affect Antarctic fauna or flora. The purpose of this study is to provide background information upon which the USAP may draw when complying with its responsibilities under the National Environmental Policy Act of 1969, the Antarctic Treaty, and the Madrid Protocol.

  16. Modeling the ascent of sounding balloons: derivation of the vertical air motion

    Directory of Open Access Journals (Sweden)

    A. Gallice

    2011-06-01

    Full Text Available A new model to describe the ascent of sounding balloons in the troposphere and lower stratosphere (up to ~30–35 km altitude is presented. Contrary to previous models, detailed account is taken of both the variation of the drag coefficient with altitude and the heat imbalance between the balloon and the atmosphere. To compensate for the lack of data on the drag coefficient of sounding balloons, a reference curve for the relationship between drag coefficient and Reynolds number is derived from a dataset of flights launched during the Lindenberg Upper Air Methods Intercomparisons (LUAMI campaign. The transfer of heat from the surrounding air into the balloon is accounted for by solving the radial heat diffusion equation inside the balloon. The potential applications of the model include the forecast of the trajectory of sounding balloons, which can be used to increase the accuracy of the match technique, and the derivation of the air vertical velocity. The latter is obtained by subtracting the ascent rate of the balloon in still air calculated by the model from the actual ascent rate. This technique is shown to provide an approximation for the vertical air motion with an uncertainty error of 0.5 m s−1 in the troposphere and 0.2 m s−1 in the stratosphere. An example of extraction of the air vertical velocity is provided in this paper. We show that the air vertical velocities derived from the balloon soundings in this paper are in general agreement with small-scale atmospheric velocity fluctuations related to gravity waves, mechanical turbulence, or other small-scale air motions measured during the SUCCESS campaign (Subsonic Aircraft: Contrail and Cloud Effects Special Study in the orographically unperturbed mid-latitude middle troposphere.

  17. Laceration of anterior mitral leaflet postpercutaneous balloon mitral valvuloplasty for rheumatic mitral stenosis

    OpenAIRE

    Jadoon, Mehmood; Roberts, M. J.; Dixon, L.; Jones, Mark

    2012-01-01

    A 37-year-old Caucasian female with known rheumatic mitral stenosis was admitted for Balloon mitral valvuloplasty which was complicated with a laceration of anterior mitral leaflet (A2 scallop) resulting in severe mitral regurgitation. Intra-aortic balloon pump (IABP) was instituted and the patient was referred for emergency mitral surgery. During surgery anterior mitral leaflet was excised. Most of the posterior leaflet was preserved. Mitral valve was replaced with St Jude mitral mechanical ...

  18. 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.

  19. Drug-Coated Balloon Treatment of Very Late Stent Thrombosis Due to Complicated Neoatherosclerosis

    Science.gov (United States)

    Alfonso, Fernando; Bastante, Teresa; Cuesta, Javier; Benedicto, Amparo; Rivero, Fernando

    2016-01-01

    We describe the treatment of a patient presenting with very-late stent thrombosis with the use of a drug-coated balloon. In this patient, optical coherence tomography disclosed that ruptured and complicated neoatherosclerosis was the underlying substrate responsible for the episode of very-late stent thrombosis. The potential use of drug-coated balloons in this unique scenario is discussed. PMID:27409130

  20. Identification of cerebral response to balloon distention of the bile duct

    Institute of Scientific and Technical Information of China (English)

    Masafumi; Suyama; Yoshihiro; Kubokawa; Yuuji; Matsumura; Koichi; Inami; Sumio; Watanabe; Eiji; Kirino

    2010-01-01

    AIM: To identify the brain loci that process human biliary sensation. METHODS: In 6 patients (age range: 42-74 years; 4 men), who underwent percutaneous transhepatic biliary drainage (PTBD), the distal biliary tract was stimulated by repeatedly inflating the balloon of the PTBD catheter so that it reached volumes that produced a definite painless sensation. The functional magnetic resonance imaging (fMRI) of the cortical response to biliary sensation was examined. RESULTS: Biliary balloon stimulation elicit...

  1. Expression of glutamine synthetase in balloon cells: a basis of their antiepileptic role?

    Science.gov (United States)

    Buccoliero, Anna Maria; Barba, Carmen; Giordano, Flavio; Baroni, Gianna; Genitori, Lorenzo; Guerrini, Renzo; Taddei, Gian Luigi

    2015-01-01

    Glutamine synthetase is an enzyme involved in the clearance of glutamate, the most potent excitatory neurotransmitter. We studied the immunohistochemical expression of glutamine synthetase in neocortical samples from 5 children who underwent surgery for pharmacoresistant epilepsy and a histological diagnosis of focal cortical dysplasia IIb. In all cases, balloon cells, but not dysmorphic neurons, were immunopositive for glutamine synthetase. This finding suggests that balloon cells can be involved in the neutralization of glutamate and play a protective anti-seizure role.

  2. A New Type of Captive Balloon for Vertical Meteorological Observation in Urban Area

    Science.gov (United States)

    Nakamura, M.; Sakai, S.; Ono, K.

    2010-12-01

    Many meteorological observations in urban area have been made in recent years in order to investigate the mechanism of heat island. However, there are few data of cooling process in urban area. For this purpose, high density observations in both space and time are required. Generally vertical meteorological observations can be made by towers, radars, balloons. These methods are limited by urban area conditions. Among these methods, a captive balloon is mainly used to about a hundred meter from ground in a vertical meteorological observation. Small airships called kytoons or advertising balloons, for example. Conventional balloons are, however, influenced by the wind and difficult to keep the specified position. Moreover, it can be dangerous to conduct such observations in the highly build-up area. To overcome these difficulties, we are developing a new type of captive balloon. It has a wing form to gain lift and keep its position. It is also designed small to be kept in a carport. It is made of aluminum film and polyester cloth in order to attain lightweight solution. We have tried floating a balloon like NACA4424 for several years. It was difficult to keep a wing form floating up over 100 meters from ground because internal pressure was decreased by different temperature. The design is changed in this year. The balloon that has wing form NACA4415 is similar in composition to an airplane. It has a big gasbag with airship form and two wing form. It is able to keep form of a wing by high internal pressure. We will report a plan for the balloon and instances of some observations.

  3. 24 Hour ST Segment Analysis in Transient Left Ventricular Apical Ballooning

    OpenAIRE

    Frank Bode; Christof Burgdorf; Heribert Schunkert; Volkhard Kurowski

    2013-01-01

    OBJECTIVE: The etiologic basis of transient left ventricular apical ballooning, a novel cardiac syndrome, is not clear. Among the proposed pathomechanisms is coronary vasospasm. Long-term ST segment analysis may detect vasospastic episodes but has not been reported. METHODS: 30 consecutive patients with transient left ventricular apical ballooning, left ventricular dysfunction and normal or near-normal coronary arteries were investigated. A 24-hour Holter ECG was obtained after emergency admi...

  4. Balloon Analogue Risk Task to assess decision-making in Acquired Brain Injury

    OpenAIRE

    Marina Areny Balagueró; Mercè Jodar Vicente; Alberto García Molina; Josep María Tormos; Teresa Roig Rovira

    2016-01-01

    Introduction: Although impairment in decision-making is a frequent consequence of frontal lobe injury, few instruments evaluate decision-making in patients with acquired brain injury (ABI). Most are difficult to use and require a well-preserved ability of complex verbal comprehension and executive functions. We propose the Balloon Analogue Risk Task (BART) as an alternative instrument to evaluate decision-making in ABI. Material and Methods: Balloon Analogue Risk Task (BART) and Iowa Gambling...

  5. Characterization of Pebax angioplasty balloon surfaces with AFM, SEM, TEM, and SAXS.

    Science.gov (United States)

    Warner, Jacob A; Forsyth, Bruce; Zhou, Fang; Myers, Jason; Frethem, Chris; Haugstad, Greg

    2016-04-01

    In the medical device industry, angioplasty balloons have been widely used in the less invasive treatment of heart disease by expanding and relieving clogged structures in various arterial segments. However, new applications using thin coatings on the balloon surface have been explored to enhance therapeutic value in the delivery of pharmaceuticals (drug-elution) or control thermal energy output (RF ablation). In this study, angioplasty balloon materials comprised of poly(ether-block-amide) (Pebax) were investigated via atomic force microscopy (AFM), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and small-angle X-ray scattering (SAXS) to characterize physical properties at the balloon surface that may affect coating adhesion. The soft segment of this Pebax 1074 material is polyethylene oxide (PEO) and the hard segment is nylon-12. The morphology of the hard segments of this block co-polymer are found via AFM stiffness measurements to be (40 ± 20) nm by (300 ± 150) nm and are oriented parallel to the surface of the balloon. SAXS measurements found the lamellar spacing to be (18.5 ± 0.5) nm, and demonstrate a preferential orientation in agreement with TEM and AFM measurements. Fixation of this balloon in resin, followed by cryo-sectioning is shown to provide a novel manner in which to investigate surface characteristics on the balloon such as material or coating thickness as well as uniformity in comparison to the bulk structure. These outputs were deemed critical to improve overall balloon processing such as molding and surface treatment options for robust designs toward better procedural outcomes targeting new therapeutic areas. PMID:25891789

  6. Double-Balloon Catheter for Isolated Liver Perfusion: An Experimental Study

    International Nuclear Information System (INIS)

    Purpose: Further development of a previously described interventional method for isolated liver perfusion (ILP) with a new double-lumen balloon catheter, and evaluation of the side-effects of such isolation.Methods: In six pigs a double-balloon occlusion catheter was placed via the transjugular approach with its tip in the portal vein. One of the balloons was positioned in the inferior vena cava (IVC), cranial to the origin of the hepatic veins and the other balloon in the portal vein. By the transfemoral approach, a single-balloon occlusion catheter was placed in the IVC caudal to the origin of the hepatic veins. A third catheter was placed by the transfemoral route with the occlusion balloon in the proper hepatic artery. After inflation of all balloons 99Tcm-labelled human serum albumin was recirculated through the liver. The isolation was evaluated by repeated measurement of radioactivity levels in peripheral blood. Laboratory tests of liver and pancreas function, and hemoglobin, were taken before, at the end of, and 3 days after the procedure. Blood gases were tested at the beginning and end of the procedure.Results: One pig died during the procedure due to technical failure and was excluded from the study. In the other pigs leakage from the isolated liver to the systemic circulation increased slowly, up to 9.7% (mean) during 30 min of recirculation of the perfusate through the liver. Laboratory tests were normal in all pigs except insignificant acidosis directly after the procedure and the slight elevation of s-ALAT after 3 days.Conclusions: Only minor leakage from the liver to the systemic circulation was noted during ILP performed with a new, double-balloon catheter. There were no serious side effects

  7. The Cosmic Foreground Explorer (COFE): A balloon-borne microwave polarimeter to characterize polarized foregrounds

    OpenAIRE

    Leonardi, Rodrigo; Williams, Brian; Bersanelli, Marco; Ferreira, Ivan; Lubin, Philip M.; Meinhold, Peter R.; O'Neill, Hugh,; Stebor, Nathan C.; Villa, Fabrizio; Villela, Thyrso; Wuensche, Carlos A.

    2007-01-01

    The COsmic Foreground Explorer (COFE) is a balloon-borne microwave polarime- ter designed to measure the low-frequency and low-l characteristics of dominant diffuse polarized foregrounds. Short duration balloon flights from the Northern and Southern Hemispheres will allow the telescope to cover up to 80% of the sky with an expected sensitivity per pixel better than 100 $\\mu K / deg^2$ from 10 GHz to 20 GHz. This is an important effort toward characterizing the polarized foregrounds for future...

  8. Pulmonary valve regurgitation following balloon valvuloplasty for pulmonary valve stenosis: Single center experience

    Directory of Open Access Journals (Sweden)

    Asim Yousuf Al Balushi

    2013-01-01

    Full Text Available Background: Pulmonary valve regurgitation following balloon valvuloplasty for moderate to severe pulmonary valve stenosis is a known late outcome of this procedure. Objective: The aim of the study was to characterise the status of pulmonary regurgitation on follow up after pulmonary valve balloon dilatation (PVBD, and to study the determinant of the severity of PR. Materials and Methods: We retrospectively reviewed 50 consecutive patients, aged 2 days to 18 years, with isolated pulmonary valve stenosis, who had undergone PVBD in 2004-2009 and were assessed with follow-up Doppler echocardiography. The impact of balloon to annulus ratio, age, and valve anatomy on the late development of moderate and severe pulmonary valve regurgitation following balloon valvuloplasty was analysed. Results: Six patients (12% had no pulmonary valve regurgitation; 32 (64% had mild, 9 (18% had moderate, and 3 (6% had severe pulmonary valve regurgitation at a mean follow-up of 4 years. Balloon to annulus ratio, age, and valve anatomy were not statistically significant predictors for moderate and severe pulmonary valve regurgitation. Conclusions: The majority of patients in our population had mild pulmonary valve regurgitation. Moderate to severe pulmonary valve regurgitation was well tolerated at midterm follow-up. Age, balloon to annulus ratio, and valve anatomy were not statistically significant predictors for the late development of moderate and severe valve regurgitation. Large and longer follow-up studies are needed to address this question.

  9. Integrating Balloon and Satellite Operation Data Centers for Technology Readiness Assessment

    Science.gov (United States)

    Mattiello-Francisco, Fátima; Fernandes, Jose Oscar

    2016-07-01

    Stratospheric balloon-borne experiments have been one of the most effective ways to validate innovative space technology, taking the advantage of reduced development cycles and low cost in launching and operation. In Brazil, the National Institute for Space Research (INPE) has balloon and satellite ground infrastructures since the 1970´s and the 1990´s, respectively. In the recent past, a strategic approach was adopted on the modernization of balloon ground operation facilities for supporting the protoMIRAX experiment, an X-ray imaging telescope under development at INPE as a pathfinder for the MIRAX (Monitor e Imageador de Raios X) satellite mission. The strategic target was to reuse the SATellite Control System (SATCS), a software framework developed to control and monitor INPÉs satellites, for balloon operation. This paper presents the results of that effort and the new ongoing project, a computer-based framework named I2Bso, which strategic target is to Integrate INPÉs Balloon and Satellite Operation data centers. The I2Bso major purpose is to support the continuous assessment of an innovative technology after different qualification flights either on board balloons or satellites in order to acquire growing evidence for the technology maturity.

  10. 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.

  11. Correcting the dynamic response of a commercial esophageal balloon-catheter.

    Science.gov (United States)

    Cross, Troy J; Beck, Kenneth C; Johnson, Bruce D

    2016-08-01

    It is generally recommended that an esophageal balloon-catheter possess an adequate frequency response up to 15 Hz, such that parameters of respiratory mechanics may be quantified with precision. In our experience, however, we have observed that some commercially available systems do not display an ideal frequency response (Wiener deconvolution. These two numerical techniques were performed on a commercial balloon-catheter interfaced with 0, 1, and 2 lengths of extension tubing (90 cm each), referred to as configurations L0, L90, and L180, respectively. The frequency response of the balloon-catheter in these configurations was assessed by empirical transfer function analysis, and its "working" range was defined as the frequency beyond which more than 5% amplitude and/or phase distortion was observed. The working frequency range of the uncorrected balloon-catheter extended up to only 10 Hz for L0, and progressively worsened with additional tubing length (L90 = 3 Hz, L180 = 2 Hz). Although both numerical methods of correction adequately enhanced the working frequency range of the balloon-catheter to beyond 25 Hz for all length configurations (L0, L90, and L180), Wiener deconvolution consistently provided more accurate corrections. Our data indicate that Wiener deconvolution provides a superior correction of the balloon-catheter's dynamic response, and is relatively more robust to extensions in catheter tube length compared with the exponential correction method. PMID:27402558

  12. Non-linear analysis and the design of Pumpkin Balloons: stress, stability and viscoelasticity

    Science.gov (United States)

    Rand, J. L.; Wakefield, D. S.

    Tensys have a long-established background in the shape generation and load analysis of architectural stressed membrane structures Founded upon their inTENS finite element analysis suite these activities have broadened to encompass lighter than air structures such as aerostats hybrid air-vehicles and stratospheric balloons Winzen Engineering couple many years of practical balloon design and fabrication experience with both academic and practical knowledge of the characterisation of the non-linear viscoelastic response of the polymeric films typically used for high-altitude scientific balloons Both companies have provided consulting services to the NASA Ultra Long Duration Balloon ULDB Program Early implementations of pumpkin balloons have shown problems of geometric instability characterised by improper deployment and these difficulties have been reproduced numerically using inTENS The solution lies in both the shapes of the membrane lobes and also the need to generate a biaxial stress field in order to mobilise in-plane shear stiffness Balloons undergo significant temperature and pressure variations in flight The different thermal characteristics between tendons and film can lead to significant meridional stress Fabrication tolerances can lead to significant local hoop stress concentrations particularly adjacent to the base and apex end fittings The non-linear viscoelastic response of the envelope film acts positively to help dissipate stress concentrations However creep over time may produce lobe geometry variations that may

  13. A rectal balloon catheter as internal immobilization device for conformal radiotherapy of prostate cancer

    International Nuclear Information System (INIS)

    Background: As known from the literature, prostate motion depends on different bladder and/or rectum fillings. The aim of this study was to analyze the influence of a rectum balloon catheter, used as an internal immobilization device, on prostate and rectum motion during the treatment course. Moreover we have analysed if the balloon enables an increase of the distance between the prostate and the posterior rectum wall. Results: An increase of the distance between the prostate and the posterior rectal wall of 8 mm was observed at the base of the prostate when using the rectum balloon. Moreover prostate motion in the ventrodorsal direction ≥4 mm (1 SD) was reduced from 6/10 patients (60%) to 1/10 patients (10%) using the rectal balloon. In general, deviations in the latero-lateral and cranio-caudal directions were less (mean ≤ 2 mm, 1 SD), no difference between both examination series (with and without balloon) was observed. Conclusion: Rectal balloon catheter offers a possibility to reduce prostate motion and rectum filling variations during treatment course. In addition it enables an increase in the distance between prostate and posterior rectal wall, which could enable an improved protection of the posterior rectal wall. (orig./AJ)

  14. Long-Term Outcomes of Balloon Dilation for Acquired Subglottic Stenosis in Children

    Directory of Open Access Journals (Sweden)

    Aliye Filiz

    2014-01-01

    Full Text Available Objectives. Balloon dilation laryngoplasty has been suggested as an alternative treatment to open surgical treatment of acquired subglottic stenosis in children. We describe long-term outcomes of balloon dilation for acquired subglottic stenosis in children. Methods. The medical charts of children who had balloon dilation for subglottic stenosis secondary to intubation were reviewed. Data included demographics, relevant history and physical examination, diagnostic workup, and management. Outcomes of balloon dilation were assessed based on improvement in preoperative symptoms, grading of stenosis, complications, and need for additional procedures. Results. Three children (2 male, 1 female, age range: 14 weeks–1 year underwent balloon dilation for acquired subglottic stenosis. Patients presented with stridor and increased work of breathing. Duration of intubation ranged from 2 days to 3 weeks. Patients became symptomatic 5 days to 6 weeks after extubation. Grade of subglottic stenosis was II in 2 patients and III in one. Subglottic stenosis patients had 2-3 dilations within 2–10 weeks. All patients were asymptomatic during 14–21-month follow-up. Conclusions. Serial balloon dilation was safe and successful method to manage acquired subglottic stenosis in this group of children. No recurrence was noted in a follow-up more than a year after resolution of symptoms.

  15. Long-term outcomes of balloon dilation for acquired subglottic stenosis in children.

    Science.gov (United States)

    Filiz, Aliye; Ulualp, Seckin O

    2014-01-01

    Objectives. Balloon dilation laryngoplasty has been suggested as an alternative treatment to open surgical treatment of acquired subglottic stenosis in children. We describe long-term outcomes of balloon dilation for acquired subglottic stenosis in children. Methods. The medical charts of children who had balloon dilation for subglottic stenosis secondary to intubation were reviewed. Data included demographics, relevant history and physical examination, diagnostic workup, and management. Outcomes of balloon dilation were assessed based on improvement in preoperative symptoms, grading of stenosis, complications, and need for additional procedures. Results. Three children (2 male, 1 female, age range: 14 weeks-1 year) underwent balloon dilation for acquired subglottic stenosis. Patients presented with stridor and increased work of breathing. Duration of intubation ranged from 2 days to 3 weeks. Patients became symptomatic 5 days to 6 weeks after extubation. Grade of subglottic stenosis was II in 2 patients and III in one. Subglottic stenosis patients had 2-3 dilations within 2-10 weeks. All patients were asymptomatic during 14-21-month follow-up. Conclusions. Serial balloon dilation was safe and successful method to manage acquired subglottic stenosis in this group of children. No recurrence was noted in a follow-up more than a year after resolution of symptoms.

  16. 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.

  17. 内镜逆行胰胆管造影过程中取胆汁行淀粉酶检测的临床意义%The clinical significance of detecting amylase level of bile during ERCP

    Institute of Scientific and Technical Information of China (English)

    邹树; 田伏洲; 崔建峰

    2006-01-01

    目的 研究内镜逆行胰胆管造影(ERCP)过程中取胆汁行淀粉酶(AMY)检测的临床意义.方法 对本中心拟行ERCP的部分患者在造影前行血清AMY测定,其中一部分患者在造影过程中取胆汁行AMY测定.根据造影结果将患者分组.结果 胰胆管合流异常(AJPB组胆汁AMY水平显著高于长共同通道(LCC)组及短共同通道(SCC)组,而LCC组胆汁AMY显著高于SCC组.AJPB组胆汁AMY显著高于血清AMY.结论 胆汁AMY水平高低与胰胆管共同通道长度有关;胆汁高AMY水平是诊断胰胆反流的参考指标,检测胆汁AMY可作为诊断AJPB的重要辅助手段.对共同通道长度未达到AJPB诊断标准,但胆汁AMY明显高于血清水平者,也应视为AJPB一样处理.

  18. MR cholangio-pancreatography using an open, low magnetic field of 0.2 Tesla. Early clinical results and comparison with a higher magnetic field (1.5 Tesla) and with ERCP

    International Nuclear Information System (INIS)

    Aim: To evaluate MR cholangio-pancreatography (MRCP) using an open low magnetic field apparatus in normals and in patients with mechanical cholestasis. Methods: MRCP was performed on five normals and on 30 patients, using both an 0.2 Tesla and 1.5 Tesla apparatus. With the low field system, rapid acquisition by relaxation enhancement was used, for the high field system, half Fourier acquisition single shot turbo spin-echo sequences were used. In all patients, sonography and ERCP of PTC was performed; 23 underwent surgery. Results: In all normals it was possible to show the bile duct, hepatic duct, gall bladder and intrahepatic ducts of the first order. Using the high field system, second order ducts could be shown and sometimes third order ducts. In the patients, MRCP, using either system, demonstrated all 21 obstructive sites due to tumours or stenoses. Stones were shown in 69% by the low field system and in 88% by the high field system. Conclusion: MRCP can be successfully carried out using the low field system. In the presence of mechanical cholestasis, image quality is adequate for the localisation of stenoses and occlusions, and using an open magnet, is suitable for planning further intervention. (orig.)

  19. 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.

  20. DLR HABLEG- High Altitude Balloon Launched Experimental Glider

    Science.gov (United States)

    Wlach, S.; Schwarzbauch, M.; Laiacker, M.

    2015-09-01

    The group Flying Robots at the DLR Institute of Robotics and Mechatronics in Oberpfaffenhofen conducts research on solar powered high altitude aircrafts. Due to the high altitude and the almost infinite mission duration, these platforms are also denoted as High Altitude Pseudo-Satellites (HAPS). This paper highlights some aspects of the design, building, integration and testing of a flying experimental platform for high altitudes. This unmanned aircraft, with a wingspan of 3 m and a mass of less than 10 kg, is meant to be launched as a glider from a high altitude balloon in 20 km altitude and shall investigate technologies for future large HAPS platforms. The aerodynamic requirements for high altitude flight included the development of a launch method allowing for a safe transition to horizontal flight from free-fall with low control authority. Due to the harsh environmental conditions in the stratosphere, the integration of electronic components in the airframe is a major effort. For regulatory reasons a reliable and situation dependent flight termination system had to be implemented. In May 2015 a flight campaign was conducted. The mission was a full success demonstrating that stratospheric research flights are feasible with rather small aircrafts.

  1. 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.

  2. Balloon catheter dilatation for mitral stenosis and severe pulmonary hypertension

    International Nuclear Information System (INIS)

    Objective: To determine the safety and efficacy of percutaneous balloon mitral valvuloplasty (PBMV) for patients with mitral stenosis and severe pulmonary hypertension, and to assess the changes in pulmonary systolic pressure during follow-up. Methods: Forty-two patients with rheumatic mitral stenosis and severe pulmonary hypertension (pulmonary systolic pressure > 75 mmHg) underwent PBMV using standard Inoue technique, and the changes in clinical functional status and echo Doppler pulmonary systolic pressure during follow-up were assessed. Results: PBMV was successful in 39 patients. Immediately after the procedure, mitral valve area increased from (0.83 +- 0.12) cm2 to (1.75 +- 0.11) cm2, pulmonary systolic pressure decreased from (85 +- 7) mmHg to (61 +- 13) mmHg (all P < 0.001). Severe mitral regurgitation occurred in 3 patients, one of whom underwent mitral valve replacement. During follow-up (average 6 months), in 39 patients with successful PBMV, the clinical functional status was improved and pulmonary systolic pressure was further decreased despite unchanged mitral valve area. Conclusions: PBMV was safe and effective for patients with mitral stenosis and severe pulmonary hypertension. Clinical functional status was improved and pulmonary systolic pressure was continuously decreased during the short-term follow-up

  3. EBEX: A balloon-borne CMB polarization experiment

    CERN Document Server

    Reichborn-Kjennerud, Britt; Ade, Peter; Aubin, Françcois; Baccigalupi, Carlo; Bao, Chaoyun; Borrill, Julian; Cantalupo, Christopher; Chapman, Daniel; Didier, Joy; Dobbs, Matt; Grain, Julien; Grainger, William; Hanany, Shaul; Hillbrand, Seth; Hubmayr, Johannes; Jaffe, Andrew; Johnson, Bradley; Jones, Terry; Kisner, Theodore; Klein, Jeff; Korotkov, Andrei; Leach, Sam; Lee, Adrian; Levinson, Lorne; Limon, Michele; MacDermid, Kevin; Matsumura, Tomotake; Meng, Xiaofan; Miller, Amber; Milligan, Michael; Pascale, Enzo; Polsgrove, Daniel; Ponthieu, Nicolas; Raach, Kate; Sagiv, Ilan; Smecher, Graeme; Stivoli, Federico; Stompor, Radek; Tran, Huan; Tristram, Matthieu; Tucker, Gregory S; Vinokurov, Yury; Yadav, Amit; Zaldarriaga, Matias; Zilic, Kyle

    2010-01-01

    EBEX is a NASA-funded balloon-borne experiment designed to measure the polarization of the cosmic microwave background (CMB). Observations will be made using 1432 transition edge sensor (TES) bolometric detectors read out with frequency multiplexed SQuIDs. EBEX will observe in three frequency bands centered at 150, 250, and 410 GHz, with 768, 384, and 280 detectors in each band, respectively. This broad frequency coverage is designed to provide valuable information about polarized foreground signals from dust. The polarized sky signals will be modulated with an achromatic half wave plate (AHWP) rotating on a superconducting magnetic bearing (SMB) and analyzed with a fixed wire grid polarizer. EBEX will observe a patch covering ~1% of the sky with 8' resolution, allowing for observation of the angular power spectrum from \\ell = 20 to 1000. This will allow EBEX to search for both the primordial B-mode signal predicted by inflation and the anticipated lensing B-mode signal. Calculations to predict EBEX constrain...

  4. Pointing control for the SPIDER balloon-borne telescope

    CERN Document Server

    Shariff, Jamil A; Amiri, Mandana; Benton, Steven J; Bock, Jamie J; Bond, J Richard; Bryan, Sean A; Chiang, H Cynthia; Contaldi, Carlo R; Crill, Brendan P; Doré, Olivier P; Farhang, Marzieh; Filippini, Jeffrey P; Fissel, Laura M; Fraisse, Aurelien A; Gambrel, Anne E; Gandilo, Natalie N; Golwala, Sunil R; Gudmundsson, Jon E; Halpern, Mark; Hasselfield, Matthew; Hilton, Gene C; Holmes, Warren A; Hristov, Viktor V; Irwin, Kent D; Jones, William C; Kermish, Zigmund D; Kuo, Chao-Lin; MacTavish, Carolyn J; Mason, Peter V; Megerian, Krikor G; Moncelsi, Lorenzo; Morford, Tracy A; Nagy, Johanna M; Netterfield, C Barth; O'Brient, Roger; Rahlin, Alexandra S; Reintsema, Carl D; Ruhl, John E; Runyan, Marcus C; Soler, Juan D; Trangsrud, Amy; Tucker, Carole E; Tucker, Rebecca S; Turner, Anthony D; Weber, Alexis C; Wiebe, Donald V; Young, Edward Y

    2014-01-01

    We present the technology and control methods developed for the pointing system of the SPIDER experiment. SPIDER is a balloon-borne polarimeter designed to detect the imprint of primordial gravitational waves in the polarization of the Cosmic Microwave Background radiation. We describe the two main components of the telescope's azimuth drive: the reaction wheel and the motorized pivot. A 13 kHz PI control loop runs on a digital signal processor, with feedback from fibre optic rate gyroscopes. This system can control azimuthal speed with < 0.02 deg/s RMS error. To control elevation, SPIDER uses stepper-motor-driven linear actuators to rotate the cryostat, which houses the optical instruments, relative to the outer frame. With the velocity in each axis controlled in this way, higher-level control loops on the onboard flight computers can implement the pointing and scanning observation modes required for the experiment. We have accomplished the non-trivial task of scanning a 5000 lb payload sinusoidally in az...

  5. Novel Balloon Surface Scanning Device for Intraoperative Breast Endomicroscopy.

    Science.gov (United States)

    Zuo, Siyang; Hughes, Michael; Yang, Guang-Zhong

    2016-07-01

    Recent advances in fluorescence confocal endomicroscopy have allowed real-time identification of residual tumour cells on the walls of the cavity left by breast conserving surgery. However, it is difficult to systematically survey the surgical site because of the small imaging field-of-view of these probes, compounded by tissue deformation and inconsistent probe-tissue contact when operated manually. Therefore, a new robotized scanning device is required for controlled, large area scanning and mosaicing. This paper presents a robotic scanning probe with an inflatable balloon, providing stable cavity scanning over undulating surfaces. It has a compact design, with an outer diameter of 4 mm and a working channel of 2.2 mm, suitable for a leached flexible fibre bundle endomicroscope probe. With the probe inserted, the tip positioning accuracy measured to be 0.26 mm for bending and 0.17 mm for rotational motions. Large area scanning was achieved (25-35 mm(2)) and the experimental results demonstrate the potential clinical value of the device for intraoperative cavity tumour margin evaluation. PMID:26508330

  6. 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 ...

  7. Kinetic analysis of MHD ballooning modes in tokamaks

    International Nuclear Information System (INIS)

    A comprehensive analysis of the stability properties of the appropriate kinetically generalized form of MHD ballooning modes together with the usual trapped-particle drift modes is presented. The calculations are fully electromagnetic and include the complete dynamics associated with compressional ion acoustic waves. Trapped-particle effects along with all forms of collisionless dissipation are taken into account without approximations. The influence of collisions is estimated with a model Krook operator. Results from the application of this analysis to realistic tokamak operating conditions indicate that unstable short-wavelength modes with significant growth rates can extend from β = 0 to value above the upper ideal-MHD-critical-beta associated with the so-called second stability regime. Since the strength of the relevant modes appears to vary gradually with β, these results support a soft beta limit picture involving a continuous (rather than abrupt or hard) modification of anomalous transport already present in low-β-tokamaks. However, at higher beta the increasing dominance of the electromagnetic component of the perturbations indicated by these calculations could also imply significantly different transport scaling properties

  8. The treatment for malignant obstructive jaundice by biliary stent placement by ERCP or PTCD (an analysis of 68 cases)%经皮逆行胰胆管造影术或经皮经肝胆管引流术放置胆管支架治疗恶性梗阻性黄疸(附68例分析)

    Institute of Scientific and Technical Information of China (English)

    张皞; 黄平; 张啸

    2011-01-01

    目的 探讨经内镜逆行胰胆管造影术(ERCP)联合改良法经皮经肝胆管引流术(PTCD)治疗恶性梗阻性黄疸的优越性.方法 68例恶性梗阻性黄疸患者先通过EKCP放置胆道支架,ERCP不成功则通过改良法PTCD窦道放置.观察其操作成功率、退黄效果、并发症发生情况、支架通畅期及患者生存期.结果 68例患者中58例通过ERCP成功置入内支架,8例行PTCD经窦道放入金属支架,2例均未能成功,成功率97.1%;所有患者术后瘙瘁、腹痛及发热等临床症状明显改善,肝功能各项转氨酶指标及胆红素水平迅速下降;7例患者支架再次阻塞,1例患者反复发作胆管炎,并发症发生率为11.8%;塑料支架通畅期平均为112 d;金属支架通畅期平均为212 d;患者生存期最短为68d,最长为540d,平均为238d.结论 ERCP及改良法PTCD创伤小,疗效好,可作为无法手术切除或不愿手术的恶性梗阻性黄疸患者的首选治疗.%[Objective]To investigated the superiority of ERCP (endoscopic retrograde cholangiopancreatography) combining improved PTCD (percutaneous transhepatic biliary drainage) in the treatment of the patients with malignant obstructive jaundice.[Methods]68 patients with malignant obstructive jaundice were placed biliary stents through ERCP firstly, and PTCD after ERCP is unsuccessful.The operation success rate, the palliative level of jaundice, the rate of complication, the stent patency period and the survival period of patientswere observed.[Results]Of 68 patients with malignant obstructive jaundice, 58 cases were placed biliary stents via ERCP; 8 via PTCD after it faied.The success rate was 97.1%.Two failed in the stent implantation via either ERCP or PTCD.The clinical symptoms such as pruritus, abdominal pain and fever were improved obviously and the liver function indicators of transaminase and bilirubin levels decreased rapidly in all patients; Stent obstruction happened on 7 cases, recurrent cholangitis

  9. High Altitude Balloons as a Platform for Space Radiation Belt Science

    Science.gov (United States)

    Mazzino, L.; Buttenschoen, A.; Farr, Q.; Hodgson, C.; Johnson, W.; Mann, I. R.; Rae, J.; University of Alberta High Altitude Balloons (UA-HAB)

    2011-12-01

    The goals of the University of Alberta High Altitude Balloons Program (UA-HAB) are to i) use low cost balloons to address space radiation science, and ii) to utilise the excitement of "space mission" involvement to promote and facilitate the recruitment of undergraduate and graduate students in physics, engineering, and atmospheric sciences to pursue careers in space science and engineering. The University of Alberta High Altitude Balloons (UA-HAB) is a unique opportunity for University of Alberta students (undergraduate and graduate) to engage in the hands-on design, development, build, test and flight of a payload to operate on a high altitude balloon at around 30km altitude. The program development, including formal design and acceptance tests, reports and reviews, mirror those required in the development of an orbital satellite mission. This enables the students to gain a unique insight into how space missions are flown. UA-HAB is a one and half year program that offers a gateway into a high-altitude balloon mission through hands on experience, and builds skills for students who may be attracted to participate in future space missions in their careers. This early education will provide students with the experience necessary to better assess opportunities for pursuing a career in space science. Balloons offer a low-cost alternative to other suborbital platforms which can be used to address radiation belt science goals. In particular, the participants of this program have written grant proposal to secure funds for this project, have launched several 'weather balloon missions', and have designed, built, tested, and launched their particle detector called "Maple Leaf Particle Detector". This detector was focussed on monitoring cosmic rays and space radiation using shielded Geiger tubes, and was flown as one of the payloads from the institutions participating in the High Altitude Student Platform (HASP), organized by the Louisiana State University and the Louisiana

  10. Balloon-borne stratospheric BrO measurements: comparison with Envisat/SCIAMACHY BrO limb profiles

    OpenAIRE

    Dorf, M.; H. Bösch; Butz, A.; Camy-Peyret, C.; Chipperfield, M. P.; Engel, A.; Goutail, F.; Grunow, K.; Hendrick, F.; Hrechanyy, S.; B. Naujokat; J.-P. Pommereau; Van Roozendael, M.; C. Sioris; F. Stroh

    2006-01-01

    For the first time, results of four stratospheric BrO profiling instruments, are presented and compared with reference to the SLIMCAT 3-dimensional chemical transport model (3-D CTM). Model calculations are used to infer a BrO profile validation set, measured by 3 different balloon sensors, for the new Envisat/SCIAMACHY (ENVIronment SATellite/SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) satellite instrument. The balloon observations include (a) balloon-borne in situ ...

  11. Balloon-borne stratospheric BrO measurements: comparison with Envisat/SCIAMACHY BrO limb profiles

    OpenAIRE

    Dorf, M.; H. Bösch; Butz, A.; Camy-Peyret, C.; Chipperfield, M. P.; Engel, A.; Goutail, F.; Grunow, K.; Hendrick, F.; Hrechanyy, S.; B. Naujokat; J.-P. Pommereau; Van Roozendael, M.; C. Sioris; F. Stroh

    2005-01-01

    For the first time, results of all four existing stratospheric BrO profiling instruments, are presented and compared with reference to the SLIMCAT 3-dimensional chemical transport model (3-D CTM). Model calculations are used to infer a BrO profile validation set, measured by 3 different balloon sensors, for the new Envisat/SCIAMACHY (ENVIronment SATellite/SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) satellite instrument. The balloon observations include (a) balloon-b...

  12. Balloon-borne stratospheric BrO measurements : comparison with Envisat/SCIAMACHY BrO limb profiles

    OpenAIRE

    Dorf, Marcel; Bösch, Hartmut; BUTZ Andre; Camy-Peyret, Claude C.; Chipperfield, Martyn P.; Engel, Andreas; Goutail, Florence; Grunow, Katja; Hendrick, François; Hrechanyy, Serhiy; Naujokat, Barbara; Pommereau, Jean-Pierre; Van Roozendael, Michel; Sioris, Christopher E.; Stroh, Fred

    2005-01-01

    For the first time, results of all four existing stratospheric BrO profiling instruments, are presented and compared with reference to the SLIMCAT 3-dimensional chemical transport model (3-D CTM). Model calculations are used to infer a BrO profile validation set, measured by 3 different balloon sensors, for the new Envisat/SCIAMACHY (ENVIronment SATellite/SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) satellite instrument. The balloon observations include (a) balloon-b...

  13. Balloon-borne stratospheric BrO measurements: comparison with Envisat/SCIAMACHY BrO limb profiles

    OpenAIRE

    Dorf, Marcel; Bösch, Hartmut; BUTZ Andre; Camy-Peyret, Claude C.; Chipperfield, Martyn P.; Engel, Andreas; Goutail, Florence; Grunow, Katja; Hendrick, François; Hrechanyy, Serhiy; Naujokat, Barbara; Pommereau, Jean-Pierre; Van Roozendael, Michel; Sioris, Christopher E.; Stroh, Fred

    2006-01-01

    For the first time, results of all four existing stratospheric BrO profiling instruments, are presented and compared with reference to the SLIMCAT 3-dimensional chemical transport model (3-D CTM). Model calculations are used to infer a BrO profile validation set, measured by 3 different balloon sensors, for the new Envisat/SCIAMACHY (ENVIronment SATellite/SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) satellite instrument. The balloon observations include (a) balloon-b...

  14. Balloon-borne stratospheric BrO measurements: comparison with Envisat/SCIAMACHY BrO limb profiles

    OpenAIRE

    Dorf, M.; H. Bösch; B. Naujokat; Pommereau, J. P.; Van Roozendael, M.; C. Sioris; F. Stroh; Weidner, F.; K. Pfeilsticker; Butz, A.; Camy-Peyret, C.; Chipperfield, M. P.; Engel, A.; Goutail, F.; Grunow, K.

    2006-01-01

    For the first time, results of four stratospheric BrO profiling instruments, are presented and compared with reference to the SLIMCAT 3-dimensional chemical transport model (3-D CTM). Model calculations are used to infer a BrO profile validation set, measured by 3 different balloon sensors, for the new Envisat/SCIAMACHY (ENVIronment SATellite/SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) satellite instrument. The balloon observations include ( a) balloon-borne in situ...

  15. Recent Results and Near Term Outlook for the NASA Balloon Science Program

    Science.gov (United States)

    Jones, William Vernon

    Long-duration and conventional balloon flights in the traditional Astrophysics, Solar and Heliophysics, and Earth Science disciplines have continued in both polar and non-polar regions since the 39th COSPAR Assembly in Mysore, India. One of these established a new flight record of 55 days over Antarctica during the 2012-2013 austral season. That Super-TIGER science flight broke both the 42-day record of the CREAM science flight during the 2004-2005 season and the 54-day super pressure balloon test flight in 2008-2009. With two comets approaching the sun in 2013-2014, the Planetary Science community has shown increased interest in remote observations of comets, planets, and other objects in the Solar System. All of the above science disciplines are interested in super pressure balloon (SPB) flights, which have been under development by NASA, and which were strongly supported by the Astro2010 Decadal Study. A 532,152 m3 (18.8 MCF) SPB with a major gamma ray astrophysics payload is planned for an ultra-long duration balloon (ULDB) test flight around and from Antarctica during the upcoming 2014-2015 season. Flights for SPB qualification to support 1000 kg science instruments to 33 km altitude have proceeded in parallel with planning for options to increase the altitude for less massive instruments that require less atmospheric overburden. The nearly constant SPB volume will provide stable altitude long-duration flights at non-polar latitudes, thereby supporting a much broader range of scientific investigations. Scientific ballooning continues to complement and enable space missions, while training young scientists and systems engineers for the workforce needed to conduct future missions. Highlights of results from past balloon-borne measurements and expected results from ongoing and planned balloon-borne experiments will be presented.

  16. 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

  17. Implementation of a Novel Flight Tracking and Recovery Package for High Altitude Ballooning Missions

    Science.gov (United States)

    Fatima, Aqsa; Nekkanti, Sanjay; Mohan Suri, Ram; Shankar, Divya; Prasad Nagendra, Narayan

    High altitude ballooning is typically used for scientific missions including stratospheric observations, aerological observations, and near space environment technology demonstration. The usage of stratospheric balloons is a cost effective method to pursue several scientific and technological avenues against using satellites in the void of space. Based on the Indian Institute of Astrophysics (IIA) ballooning program for studying Comet ISON using high altitude ballooning, a cost effective flight tracking and recovery package for ballooning missions has been developed using open source hardware. The flight tracking and recovery package is based on using Automatic Packet Reporting System (APRS) and has a redundant Global System for Mobile Communications (GSM) based Global Positioning System (GPS) tracker. The APRS based tracker uses AX.25 protocol for transmission of the GPS coordinates (latitude, longitude, altitude, time) alongside the heading and health parameters of the board (voltage, temperature). APRS uses amateur radio frequencies where data is transmitted in packet messaging format, modulated by radio signals. The receiver uses Very High Frequency (VHF) transceiver to demodulate the APRS signals. The data received will be decoded using MixW (open source software). A bridge will be established between the decoding software and the APRS software. The flight path will be predicted before the launch and the real time position co-ordinates will be used to obtain the real time flight path that will be uploaded online using the bridge connection. We also use open source APRS software to decode and Google Earth to display the real time flight path. Several ballooning campaigns do not employ payload data transmission in real time, which makes the flight tracking and package recovery vital for data collection and recovery of flight instruments. The flight tracking and recovery package implemented in our missions allow independent development of the payload package

  18. Sodium ferulate inhibits neointimal hyperplasia in rat balloon injury model.

    Directory of Open Access Journals (Sweden)

    Jing Zhang

    Full Text Available BACKGROUND/AIM: Neointimal formation after vessel injury is a complex process involving multiple cellular and molecular processes. Inhibition of intimal hyperplasia plays an important role in preventing proliferative vascular diseases, such as restenosis. In this study, we intended to identify whether sodium ferulate could inhibit neointimal formation and further explore potential mechanisms involved. METHODS: Cultured vascular smooth muscle cells (VSMCs isolated from rat thoracic aorta were pre-treated with 200 µmol/L sodium ferulate for 1 hour and then stimulated with 1 µmol/L angiotensin II (Ang II for 1 hour or 10% serum for 48 hours. Male Sprague-Dawley rats subjected to balloon catheter insertion were administrated with 200 mg/kg sodium ferulate (or saline for 7 days before sacrificed. RESULTS: In presence of sodium ferulate, VSMCs exhibited decreased proliferation and migration, suppressed intracellular reactive oxidative species production and NADPH oxidase activity, increased SOD activation and down-regulated p38 phosphorylation compared to Ang II-stimulated alone. Meanwhile, VSMCs treated with sodium ferulate showed significantly increased protein expression of smooth muscle α-actin and smooth muscle myosin heavy chain protein. The components of Notch pathway, including nuclear Notch-1 protein, Jagged-1, Hey-1 and Hey-2 mRNA, as well as total β-catenin protein and Cyclin D1 mRNA of Wnt signaling, were all significantly decreased by sodium ferulate in cells under serum stimulation. The levels of serum 8-iso-PGF2α and arterial collagen formation in vessel wall were decreased, while the expression of contractile markers was increased in sodium ferulate treated rats. A decline of neointimal area, as well as lower ratio of intimal to medial area was observed in sodium ferulate group. CONCLUSION: Sodium ferulate attenuated neointimal hyperplasia through suppressing oxidative stress and phenotypic switching of VSMCs.

  19. 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

  20. Modeling the ascent of sounding balloons: derivation of the vertical air motion

    Directory of Open Access Journals (Sweden)

    A. Gallice

    2011-10-01

    Full Text Available A new model to describe the ascent of sounding balloons in the troposphere and lower stratosphere (up to ∼30–35 km altitude is presented. Contrary to previous models, detailed account is taken of both the variation of the drag coefficient with altitude and the heat imbalance between the balloon and the atmosphere. To compensate for the lack of data on the drag coefficient of sounding balloons, a reference curve for the relationship between drag coefficient and Reynolds number is derived from a dataset of flights launched during the Lindenberg Upper Air Methods Intercomparisons (LUAMI campaign. The transfer of heat from the surrounding air into the balloon is accounted for by solving the radial heat diffusion equation inside the balloon. In its present state, the model does not account for solar radiation, i.e. it is only able to describe the ascent of balloons during the night. It could however be adapted to also represent daytime soundings, with solar radiation modeled as a diffusive process. The potential applications of the model include the forecast of the trajectory of sounding balloons, which can be used to increase the accuracy of the match technique, and the derivation of the air vertical velocity. The latter is obtained by subtracting the ascent rate of the balloon in still air calculated by the model from the actual ascent rate. This technique is shown to provide an approximation for the vertical air motion with an uncertainty error of 0.5 m s−1 in the troposphere and 0.2 m s−1 in the stratosphere. An example of extraction of the air vertical velocity is provided in this paper. We show that the air vertical velocities derived from the balloon soundings in this paper are in general agreement with small-scale atmospheric velocity fluctuations related to gravity waves, mechanical turbulence, or other small-scale air motions measured during the SUCCESS campaign (Subsonic Aircraft: Contrail and Cloud Effects

  1. Balloon Measurements of Electric Fields in Thunderstorms: A Modern Version of Benjamin Franklin's Kite

    Science.gov (United States)

    Marshall, T. C.; Stolzenburg, M.

    2006-12-01

    One of Benjamin Franklin's most famous experiments was the kite experiment, which showed that thunderstorms are electrically charged. It is not as commonly noted that the kite experiment was also one of the the first attempts to make an in situ measurement of any storm parameter. Franklin realized the importance of making measurements close to and within storms, and this realization has been shared by later atomspheric scientists. In this presentation we focus on a modern version of Franklin's kite--instrumented balloons--used for in situ measurements of electric field and other storm parameters. In particular, most of our knowledge of the charge structure inside thunderstorms is based on balloon soundings of electric field. Balloon measurements of storm electricity began with the work of Simpson and colleagues in the 1930's and 1940's. The next major instrumentation advances were made by Winn and colleagues in the 1970's and 1980's. Today's instruments are digital versions of the Winn design. We review the main instrument techniques that have allowed balloons to be the worthy successors to kites. We also discuss some of the key advances in our understanding of thunderstorm electrification made with in situ balloon-borne instruments.

  2. Approaching the knee -- balloon-borne observations of cosmic ray composition

    CERN Document Server

    Cherry, M L

    2005-01-01

    Below the knee in the cosmic ray spectrum, balloon and spacecraft experiments offer the capability of direct composition and energy measurements on the primary particles. A major difficulty is obtaining enough exposure to extend the range of direct measurements sufficiently high in energy to permit overlap with ground-based observations. Presently, balloon and space measurements extend only up to ~100 TeV, well below the range of ground-based experiments. The prospect of Ultra-Long Duration Balloon missions offers the promise of multiple long flights that can build up exposure. The status of balloon measurements to measure the high energy proton and nuclear composition and spectrum is reviewed, and the statistical considerations involved in searching for a steepening in the spectrum are discussed. Given the very steeply falling spectrum, it appears unlikely that balloon experiments will be able to extend the range of direct measurements beyond 1000 TeV any time in the near future. Especially given the recent ...

  3. Formation and evolution of flapping and ballooning waves in magnetospheric plasma sheet

    Science.gov (United States)

    Ma, J. Z. G.; Hirose, A.

    2016-05-01

    By adopting Lembége & Pellat's 2D plasma-sheet model, we investigate the flankward flapping motion and Sunward ballooning propagation driven by an external source (e.g., magnetic reconnection) produced initially at the sheet center. Within the ideal MHD framework, we adopt the WKB approximation to obtain the Taylor-Goldstein equation of magnetic perturbations. Fourier spectral method and Runge-Kutta method are employed in numerical simulations, respectively, under the flapping and ballooning conditions. Studies expose that the magnetic shears in the sheet are responsible for the flapping waves, while the magnetic curvature and the plasma gradient are responsible for the ballooning waves. In addition, the flapping motion has three phases in its temporal development: fast damping phase, slow recovery phase, and quasi-stabilized phase; it is also characterized by two patterns in space: propagating wave pattern and standing wave pattern. Moreover, the ballooning modes are gradually damped toward the Earth, with a wavelength in a scale size of magnetic curvature or plasma inhomogeneity, only 1-7% of the flapping one; the envelops of the ballooning waves are similar to that of the observed bursty bulk flows moving toward the Earth.

  4. A review of recent results in gamma-ray astronomy obtained from high-altitude balloons

    Science.gov (United States)

    Teegarden, B. J.

    1994-06-01

    This paper reviews recent results in gamma-ray astronomy obtained from experiments flown on high-altitude balloons. New generation balloon-borne imaging experiments have produced the first gamma-ray maps of the Galactic center (GC) region. Balloon flights of new gamma-ray spectrometers with improved sensitivity have provided important new information on the GC annihilation line. For the first time, the narrow 511 keV line as been resolved (FWHM approx. = 3 keV). A very interesting spectral feature at approximately 170 keV has been attributed to backscattered annihilation, probably from the vicinity of a compact object. New results from the Compton Gamma-Ray Observatory (CGRO)/OSSE and Granat/SIGMA experiments on the annihilation line, when considered together with the recent balloon results, have added greatly to our knowledge and understanding of the origin and distribution of this emission. Balloon-borne instruments have made important measurements of gamma-ray continuum and line emission from SN 1987A. The GRIS spectrometer unambiguously resolved the 847 and 1238 keV line emission from radioactive Co-56 synthesized during the explosion. This data indicated that simple spherically symmetric and homogeneous models did not provide an adequate description of the expanding SN shell.

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

    Directory of Open Access Journals (Sweden)

    J. Lisý

    2014-01-01

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

  6. 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.).

  7. Status of the Balloon-Borne X-ray Polarimetry Mission X-Calibur

    Science.gov (United States)

    Krawczynski, Henric; Kislat, Fabian; Stuchlik, David; Okajima, Takashi; de Geronimo, Gianluigi

    2016-04-01

    We report on the status of the balloon borne hard X-ray polairmetry mission X-Calibur. The missions combines a focussing hard X-ray mirror from the InFOCuS collaboration with a scattering polarimeter and the WASP (Wallops Arc Second Pointer) pointing system. The mission is scheduled for a conventonal ~1 day balloon flight in Fall 2016 and a long duration (~30 day) balloon flight from McMurdo (Ross Island) in 2018/2019. X-Calibur will allow us to measure ~5% polarization fractions for strong sources with a Crab-like enegry spectra and fluxes. The science targets of the first balloon flights will include the stellar mass black holes GRS 1915+105 and Cyg X-1, Her X-1, Sco X-1, and the Crab nebula and pulsar. The long duration balloon flight will target several X-ray binaries and the extragalactic mass accreting supermassive black hole Cen A. In this contribution we give an update on the status of the mission, and the expected science return.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2009-07-15

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

  9. 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.

  10. Balloon catheter dilation technology combined with a fibrolaryngoscope to treat a maxillary sinus cyst.

    Science.gov (United States)

    Xiao, Jianxin; Chen, Junming; Wang, Yuejian

    2016-02-01

    A prospective randomized controlled study was conducted to investigate the effect of balloon catheter dilation technology combined with a fibrolaryngoscope in the treatment of a maxillary sinus cyst. The clinical data of 14 cases (19 maxillary sinuses) with balloon catheter dilation technology combined with a fibrolaryngoscope to remove sinus cysts (balloon group) and 16 cases (23 maxillary sinuses) with conventional nasal endoscopic sinus surgery to remove sinus cysts (conventional group) were analyzed. All cases have completed the preoperative and postoperative SNOT-20, nasal endoscopy and coronal sinus CT scan. Lund-Kennedy endoscopic and Lund-Mackay CT scan staging scores were recorded. All patients were followed up for 24 weeks after the operation. The SNOT-20 scores, Lund-Kennedy endoscopic and Lund-Mackay CT scan staging scores were lower in the balloon group than that in the control group. Balloon catheter dilation technology combined with a fibrolaryngoscope can effectively preserve the function and structures of the nasal cavity and sinus, making it a good choice in the treatment of a retention cyst of the maxillary sinus.

  11. 间苯三酚预防胆总管结石ERCP术后胰腺炎的效果%Effect of phloroglucinol on the prevention of postoperative pancreatitis in patients with common bile duct stones after ERCP surgery

    Institute of Scientific and Technical Information of China (English)

    林蕤; 顾卫; 黄慧

    2016-01-01

    Objective To study the value of preoperative application of phloroglucinol in the prevention of postoperative pancreatitis in patients with common bile duct stones undergoing endoscopic retrograde cholangiopancrea-tography (ERCP). Methods Thirty-eight patients with common bile duct stones received ERCP treatment in Depart-ment of Hepatobiliary Surgery in our hospital from June 2014 to June 2015 were selected and randomly divided into the observation group (n=19) and the control group (n=19). The control group received conventional surgery scheme, with diazepam, pethidine and anisodamine applied preoperatively. The observation group additionally applied phloroglucinol preoperatively on the basis of the control group. The adverse reactions, gastric peristalsis times, operation time, the pre-operative, postoperative 6 h, 24 h serum amylase level, as well as the incidence of postoperative hyperamylasemia and acute pancreatitis were compared between the two groups. Results The nausea and vomiting, hypertension and intraopera-tive gastric motility times in observation group were significantly lower than those in the control group [1 case vs 6 cases, 2 cases vs 9 cases, (1.6 ± 0.5) times vs (4.2 ± 0.6) times, P<0.05]. The operation time of observation group was significantly shorter than that in the control group [(34.7±6.7) min vs (48.2±12.1) min, P<0.05]. The serum amylase levels showed no sta-tistically significant difference between the two groups before operation [(55.8±12.5) c·µ-1·L-1 vs (56.3±13.7) c·µ -1·L-1]. The levels in the two groups at postoperative 6 h, 24 h were significantly lower than the preoperative level (P<0.05), and the levels at each postoperative time point of the observation group were significantly lower than those of the control group [(82.5±24.7) c·µ-1·L-1 vs (122.4±44.6) c·µ-1·L-1;(72.1±29.5) c·µ-1·L-1 vs (114.3±58.4) c·µ-1·L-1, P<0.05]. The to-tal incidence rates of postoperative hyperamylasemia and acute

  12. 氯戊米特对逆行胰胆管造影术后胰腺功能的影响%Effect of cholecystokinin-receptor antagonist lorglumide on the pancreas function of Post-ERCP in rat

    Institute of Scientific and Technical Information of China (English)

    彭海峰; 闫玉矿; 郑通标; 闵军; 龚时文; 杨镇

    2004-01-01

    目的探讨氯戊米特对逆行胰胆管造影(ERCP)术后胰腺功能的影响.方法比较对照组(S组)、ERCP组(E组)及氯戊米特组(L组)急性胰腺炎的发生率、血浆胆囊收缩素八肽(CCK-OP)、血淀粉酶及胰腺组织的病理变化.结果 E组并发急性胰腺炎1例,S组及L组均无急性胰腺炎发生.E组术后4 h血清淀粉酶及血浆CCK-OP均明显高于对照组(P<0.05),术后24h血浆CCK-OP与对照组差异无显著性(P>0.05),但血清淀粉酶仍明显高于对照组(P<0.05).L组术后4 h血清淀粉酶及血浆CCK-OP均明显高于S组(P<0.05),但与E组对比明显降低(P<0.05).术后24 h血清淀粉酶及血浆CCK-OP与S组比较差异无显著性(P>0.05).结论氯戊米特可有效抑制CCK-OP的作用,保护ERCP术后胰腺的功能,减轻酶血症,预防急性胰腺炎的发生.

  13. Anesthesia with Flurbiprofen Axetil and Propofol for Endoscopic Retrograde Cholangiopancreatography%ERCP 术中氟比洛芬酯复合异丙酚麻醉的效果

    Institute of Scientific and Technical Information of China (English)

    朱龙泉; 朱云生; 陈世彪; 赵为禄

    2012-01-01

      目的评价内镜下逆行胰导管造影(ERCP)术患者用氟比洛芬酯复合异丙酚麻醉的安全性和有效性.方法60例行ERCP患者,年龄20~70岁,ASAⅠ级或Ⅱ级,按随机数字表法分为氟比洛芬酯复合异丙酚组(F组)和对照组(C组),每组30例.鼻导管给氧情况下,每组以2 mg・kg -1异丙酚诱导,术中以10 mg・kg -1・h-1异丙酚维持麻醉,F组于诱导时缓慢追加氟比洛芬酯50 mg ,记录起效时间、恢复时间、术中体动(程度和次数)、镇痛效果、呼吸抑制评分和HR、MAP、SpO2及术后并发症的发生情况等.结果2组间麻醉起效时间和恢复时间差异无统计学意义(P>0.05),F组术中体动和呼吸抑制评分的例数低于C组(P0.05).结论氟比洛芬酯复合异丙酚麻醉用于ERCP术中麻醉效果较好,但术后嗜睡的发生率较高.

  14. New developments in the clinical use of drug-coated balloon catheters in peripheral arterial disease

    Science.gov (United States)

    Naghi, Jesse; Yalvac, Ethan A; Pourdjabbar, Ali; Ang, Lawrence; Bahadorani, John; Reeves, Ryan R; Mahmud, Ehtisham; Patel, Mitul

    2016-01-01

    Peripheral arterial disease (PAD) involving the lower extremity is a major source of morbidity and mortality. Clinical manifestations of PAD span the spectrum from lifestyle limiting claudication to ulceration and gangrene leading to amputation. Advancements including balloon angioplasty, self-expanding stents, drug-eluting stents, and atherectomy have resulted in high technical success rates for endovascular therapy in patients with PAD. However, these advances have been limited by somewhat high rates of clinical restenosis and clinically driven target lesion revascularization. The recent introduction of drug-coated balloon technology shows promise in limiting neointimal hyperplasia induced by vascular injury after endovascular therapies. This review summarizes the contemporary clinical data in the emerging area of drug-coated balloons.

  15. 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.

  16. Evaluation of interventional angioplasty by using thrombolysis and balloon dilatation in treating pulmonary embolism

    International Nuclear Information System (INIS)

    Objective: To evaluate the interventional angioplasty by using thrombolysis and balloon dilatation in the treatment of pulmonary embolism. Methods: Eight patients with pulmonary embolism were treated with interventional management including fragmentation of the thrombus, thrombolysis with urokinase flush infusion, balloon dilatation and continuing low-dose infusion for 24 hours. Anticoagulation with heparin was given simultaneously. Results: The pulmonary artery was completely recanalized in three patients, and partially recanalized in five patients. The blood oxygen saturation reached 100% in 3 cases and was over 93% in 5 cases. Conclusion: Interventional angioplasty by means of thrombolysis or balloon dilatation is an effective therapy for pulmonary embolism in reopening the embolized pulmonary artery, bringing the pulmonary hemodynamics to normal condition and correcting the hypoxemia. (authors)

  17. Palliative balloon dilation of pulmonic stenosis in a dog with tetralogy of Fallot.

    Science.gov (United States)

    Weder, C; Ames, M; Kellihan, H; Bright, J; Orton, C

    2016-09-01

    A 6-month-old Beagle with tetralogy of Fallot underwent balloon valvuloplasty of the pulmonary valve. Balloon valvuloplasty was successful and resulted in palliation of clinical signs and an improved quality of life for approximately 9 months. After 9 months, the dog became symptomatic and a modified Blalock-Taussig shunt procedure was successfully performed. Based on this report, balloon valvuloplasty in dogs with tetralogy of Fallot appears to be a feasible technique that may result in improvement of clinical signs. In addition, it may allow for the delay of the more invasive surgical palliation and provide time for weight gain and development of the pulmonary vascular bed for greater ease of surgical shunt creation. PMID:27025569

  18. Solid State Inflation Balloon Active Deorbiter: Scalable Low-Cost Deorbit System for Small Satellites

    Science.gov (United States)

    Huang, Adam

    2016-01-01

    The goal of the Solid State Inflation Balloon Active Deorbiter project is to develop and demonstrate a scalable, simple, reliable, and low-cost active deorbiting system capable of controlling the downrange point of impact for the full-range of small satellites from 1 kg to 180 kg. The key enabling technology being developed is the Solid State Gas Generator (SSGG) chip, generating pure nitrogen gas from sodium azide (NaN3) micro-crystals. Coupled with a metalized nonelastic drag balloon, the complete Solid State Inflation Balloon (SSIB) system is capable of repeated inflation/deflation cycles. The SSGG minimizes size, weight, electrical power, and cost when compared to the current state of the art.

  19. BECOOL: a magnetohydrodynamic ballooning mode eigenvalue solver based on variable order Legendre polynomial basis functions

    Science.gov (United States)

    Cooper, Guy A.; Peterson, Randolph S.; Gruber, Ralf; Cooper, W. Anthony; Graves, Jonathan P.

    2009-11-01

    An incompressible variational ideal ballooning mode equation is discretized with the COOL finite element discretization scheme using basis functions composed of variable order Legendre polynomials.footnotetextG. A. Cooper, J. P. Graves, W. A. Cooper, R. Gruber and R. S. Peterson, J. Comput. Phys. 228 (2009) 4911-4916. This reduces the second order ordinary differential equation to a special block pentadiagonal matrix equation that is solved using an inverse vector iteration method. A benchmark test of BECOOL (Ballooning Eigensolver using COOL finite elements) with second order Legendre polynomials recovers precisely the eigenvalues computed by the VVBAL shooting code.footnotetextA. Cooper, Plasma Phys. Control. Fusion 34 (1992) 1011-1036. Timing runs reveal the need to determine an optimal lower order case. Eigenvalue convergence runs show that cubic Legendre polynomials construct the optimal ballooning mode equation for intensive computations.

  20. Analysis of Data from the Balloon Borne Gamma RAy Polarimeter Experiment (GRAPE)

    Science.gov (United States)

    Wasti, Sambid K.; Bloser, Peter F.; Legere, Jason S.; McConnell, Mark L.; Ryan, James M.

    2016-04-01

    The Gamma Ray Polarimeter Experiment (GRAPE), a balloon borne polarimeter for 50~300 keV gamma rays, successfully flew in 2011 and 2014. The main goal of these balloon flights was to measure the gamma ray polarization of the Crab Nebula. Analysis of data from the first two balloon flights of GRAPE has been challenging due to significant changes in the background level during each flight. We have developed a technique based on the Principle Component Analysis (PCA) to estimate the background for the Crab observation. We found that the background depended mostly on the atmospheric depth, pointing zenith angle and instrument temperatures. Incorporating Anti-coincidence shield data (which served as a surrogate for the background) was also found to improve the analysis. Here, we present the calibration data and describe the analysis done on the GRAPE 2014 flight data.

  1. 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.

  2. Design and construction of a carbon fiber gondola for the SPIDER balloon-borne telescope

    CERN Document Server

    Soler, J D; Amiri, M; Benton, S J; Bock, J J; Bond, J R; Bryan, S A; Chiang, C; Contaldi, C C; Crill, B P; Doré, O P; Farhang, M; Filippini, J P; Fissel, L M; Fraisse, A A; Gambrel, A E; Gandilo, N N; 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; Kuo, C L; MacTavish, C J; Mason, P V; Megerian, K G; Moncelsi, L; Nagy, J M; Netterfield, C B; O'Brient, R; Rahlin, A S; Reintsema, C D; Ruhl, J E; Runyan, M C; Shariff, J A; Trangsrud, A; Tucker, C; Tucker, R S; Turner, A D; Weber, A C; Wiebe, D V; Young, E Y

    2014-01-01

    We introduce the light-weight carbon fiber and aluminum gondola designed for the SPIDER balloon-borne telescope. SPIDER is designed to measure the polarization of the Cosmic Microwave Background radiation with unprecedented sensitivity and control of systematics in search of the imprint of inflation: a period of exponential expansion in the early Universe. The requirements of this balloon-borne instrument put tight constrains on the mass budget of the payload. The SPIDER gondola is designed to house the experiment and guarantee its operational and structural integrity during its balloon-borne flight, while using less than 10% of the total mass of the payload. We present a construction method for the gondola based on carbon fiber reinforced polymer tubes with aluminum inserts and aluminum multi-tube joints. We describe the validation of the model through Finite Element Analysis and mechanical tests.

  3. Loss of Guide Wire: A Rare Complication of Intra-Aortic Balloon Pump Insertion

    Directory of Open Access Journals (Sweden)

    Manouchehr Hekmat

    2015-10-01

    Full Text Available At the final stages of a coronary artery bypass graft operation on a 64-year-old man, an experienced physician attempted to insert an intra-aortic balloon pump into the femoral artery via the Seldinger technique. However, while the balloon pump was being passed over the guide wire, the latter was completely lost.The guide wire should be held at the tip at all times to prevent passage into the vessel. Strict adherence to this rule will prevent guide-wire loss, which is, albeit rare and completely avoidable, a potentially life-threatening complication of central vein or artery catheterization, with reported fatality rates of up to 20% when the whole wire is lost. The literature contains several reports on guide-wire loss during central venous, arterial, and hemodialysis catheterization, but we report for the first time the loss of a guide wire as a rare complication of intra-aortic balloon pump insertion.

  4. ERCP胆管支架置入与传统手术方法解除恶性胆道梗阻的临床疗效及安全性比较%Comparison of Clinical Efficacy and Safety of Biliary Stent Insertion by ERCP and Traditional Operation for Patients with Malignant Biliary Obstruction

    Institute of Scientific and Technical Information of China (English)

    梁君蓉; 石德红; 张冲; 李晓林; 韩国栋; 李春燕

    2015-01-01

    Objective To compare the clinical efficacy and safety of biliary stent insertion by endoscopic retrograde cholangiopancreatography( ERCP) and traditional operation for patients with malignant biliary obstruction.Methods 92 cases of malignant biliary obstruction were divided into group A,group B and group C according to the surgery method.Group A,group B and group C respectively received traditional operation,biliateral plastic stent drainage via ERCP and biliateral metal stent drain-age via ERCP.Results There were no significant difference in survival time among the 3 groups (P>0.05);Postoperative pa-tency period in group C was significantly longer than that of group B,there had significant difference ( P<0.05); The hospital stay in group B and group C were much less than that of group A ( P<0.05);Liver function indexes 1 week after operation in group B and group C were superior to group A (P<0.05);The occurrence of complictions were 43.8%,14.3%and 15.6%in group A,group B and group C (P<0.05).Conclusion Biliary stent insertion via ERCP and traditional operation have similar efficacy for malignant biliary obstruction.ERCP has less complication and faster recovery of liver function.Biliateral metal stent drainage via ERCP has ideal effect of drainage.%目的:比较内镜下逆行胰胆管造影( ERCP)胆管支架置入与传统手术方法解除恶性胆道梗阻的临床疗效及安全性。方法根据患者手术方法不同将92例恶性胆道梗阻患者分入A组、B组及C组,3组患者分别接受传统外科手术治疗、ERCP置入塑料支架治疗及ERCP置入金属支架治疗。结果3组生存时间无显著差别(P>0.05)。 C组术后胆道通畅时间显著长于B组,差别具有统计学意义(P<0.05)。 B组及C组住院时间显著少于A组(P<0.05)。术后1周B组及C组肝功能检测指标显著优于A组(P<0.05)。 A组、B组及C组并发症发生率分别为43.8%、14.3%和15.6%(P<0

  5. Lifting options for stratospheric aerosol geoengineering: advantages of tethered balloon systems.

    Science.gov (United States)

    Davidson, Peter; Burgoyne, Chris; Hunt, Hugh; Causier, Matt

    2012-09-13

    The Royal Society report 'Geoengineering the Climate' identified solar radiation management using albedo-enhancing aerosols injected into the stratosphere as the most affordable and effective option for geoengineering, but did not consider in any detail the options for delivery. This paper provides outline engineering analyses of the options, both for batch-delivery processes, following up on previous work for artillery shells, missiles, aircraft and free-flying balloons, as well as a more lengthy analysis of continuous-delivery systems that require a pipe connected to the ground and supported at a height of 20 km, either by a tower or by a tethered balloon. Towers are shown not to be practical, but a tethered balloon delivery system, with high-pressure pumping, appears to have much lower operating and capital costs than all other delivery options. Instead of transporting sulphuric acid mist precursors, such a system could also be used to transport slurries of high refractive index particles such as coated titanium dioxide. The use of such particles would allow useful experiments on opacity, coagulation and atmospheric chemistry at modest rates so as not to perturb regional or global climatic conditions, thus reducing scale-up risks. Criteria for particle choice are discussed, including the need to minimize or prevent ozone destruction. The paper estimates the time scales and relatively modest costs required if a tethered balloon system were to be introduced in a measured way with testing and development work proceeding over three decades, rather than in an emergency. The manufacture of a tether capable of sustaining the high tensions and internal pressures needed, as well as strong winds, is a significant challenge, as is the development of the necessary pumping and dispersion technologies. The greatest challenge may be the manufacture and launch of very large balloons, but means have been identified to significantly reduce the size of such balloons or aerostats.

  6. 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.

  7. QUANTITATIVE TESTS OF ELMS AS INTERMEDIATE N PEELING-BALLOONING MODES

    International Nuclear Information System (INIS)

    OAK A271 QUANTITATIVE TESTS OF ELMS AS INTERMEDIATE N PEELING-BALLOONING MODES. Two of the major issues crucial for the design of the next generation tokamak burning plasma devices are the predictability of the edge pedestal height and control of the divertor heat load in H-mode configurations. Both of these are strongly impacted by edge localized modes (ELMs) and their size. A working model for ELMs is that they are intermediate toroidal mode number, n ∼ 5-30, peeling-ballooning modes driven by the large edge pedestal pressure gradient P(prime) and the associated large edge bootstrap current density JBS. the interplay between P(prime) and JBS as a discharge evolves can excite peeling-ballooning modes over a wide spectrum of n. The pedestal current density plays a dual role by stabilizing the high n ballooning modes via opening access to second stability but providing free energy to drive the intermediate n peeling modes. This makes a systematic evaluation of this model particularly challenging. This paper describes recent quantitative tests of this model using experimental data from the DIII-D and the JT-60U tokamaks. These tests are made possible by recent improvements to the ELITE MHD stability code, which allow an efficient evaluation of the unstable peeling-ballooning modes, as well as by improvements to other diagnostic and analysis techniques. Some of the key testable features of this model are: (1) ELMs are triggered when the growth rates of intermediate n MHD modes become significantly large; (2) ELM sizes are related to the radial widths of the unstable modes; (3) the unstable modes have a strong ballooning character localized in the outboard bad curvature region; (4) at high collisionality, ELM size generally becomes smaller because JBS is reduced

  8. Balloon Coating with Rapamycin Using an On-site Coating Device

    Energy Technology Data Exchange (ETDEWEB)

    Schmehl, Joerg, E-mail: joerg.schmehl@med.uni-tuebingen.de [Department of Diagnostic and Interventional Radiology, University Hospital of Tuebingen (Germany); Ruhr, Juergen von der [Institute of Anatomy, University of Tuebingen (Germany); Dobratz, Markus; Kehlbach, Rainer [Department of Diagnostic and Interventional Radiology, University Hospital of Tuebingen (Germany); Braun, Isabelle [Translumina GmbH (Germany); Greiner, Tim-Oliver [Clinic of Thoracic and Cardiovascular Surgery, University Hospital of Tuebingen (Germany); Claussen, Claus D. [Department of Diagnostic and Interventional Radiology, University Hospital of Tuebingen (Germany); Behnisch, Boris [Translumina GmbH (Germany)

    2013-06-15

    Purpose. The efficacy of drug-eluting balloons has been demonstrated in clinical trials. The drug predominantly used is paclitaxel because of its lipophilic properties and the rapid onset of action. The aim of the investigation was to evaluate the feasibility and efficacy of an alternative balloon coating with rapamycin that can be applied on site.MethodsThe balloon coating (3.0/18 and 3.0/12 mm, Cathy No. 4, Translumina GmbH) with rapamycin was conducted with a coating machine (Translumina GmbH). Concentrations were 2, 2 Multiplication-Sign 2, 3, and 4 %. Measurements regarding the amount of substance released to the vessel wall were carried out on explanted porcine coronaries by means of ultraviolet and visible-light spectroscopy. Inflation time varied between 30 and 120 s. The biological effect of the coating was evaluated in a porcine peripheral overstretch and stent implantation model. Results. The amount of rapamycin on the balloon surface ranged from 558 {+-} 108 {mu}g for the 2 % solution to 1,441 {+-} 228 {mu}g in the 4 % solution. An amount of 95 {+-} 63-193 {+-} 113 {mu}g was released into the vessel wall. The quantitative measurements of the angiographic examinations 4 weeks after treatment revealed a reduction of diameter stenosis from 20.6 {+-} 17.4 % in the control group to 11.6 {+-} 5.5 % in the drug-eluting balloon group. Conclusion. A balloon coating with rapamycin omitting an excipient is possible with a dose-adjustable coating machine. However, the biological effects are moderate, which make further optimization of the coating process and evaluation of appropriate excipients necessary.

  9. CNES super pressure balloons assessment and new developments to prepare Strateole-2 campaign

    Science.gov (United States)

    Venel, Stephanie; Spel, Martin; Cocquerez, Philippe; Meyer, Jean-Renaud; Nicot, Jean-Marc.; Parot, Gael; Perraud, Sophie

    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 payloada. This paper will describe the main results and lessons achieved during the last CONCORDIASI campaign in 2010 over the Antarctic region. Thus, anomalies on the on-board system were investigated and explained by the effect of atmospheric particles fluxes. Also related to these flights, an accurate thermal model was built to evaluate the temperature distribution in the balloon, and several ageing tests have been made to better understand the effect of solar exposure on the different balloon materials. This paper will also present the new developments in progress for the future STRATEOLE-2 campaign dedicated to advance the knowledge of coupling processes between the troposphere and the stratosphere in the deep tropics, and foreseen in 2018-2019. In particular, a new command-control system will be developed to be in conformity with the CNES safety rules, and in continuation with the new zero pressure balloons system named NOSYCA. New solar panels are under investigation. Finally, two new balloon sizes will grow the SPB family to respond to the scientist demand of two special altitude densities.

  10. Effectiveness of Rehabilitative Balloon Swallowing Treatment on Upper Esophageal Sphincter Relaxation and Pharyngeal Motility for Neurogenic Dysphagia

    OpenAIRE

    Kim, Yong Kyun; Choi, Sung Sik; Choi, Jung Hwa; Yoon, Jeong-Gyu

    2015-01-01

    Objective To investigate the relationship between dysphagia severity and opening of the upper esophageal sphincter (UES), and to assess the effect of balloon size on functional improvement after rehabilitative balloon swallowing treatment in patients with severe dysphagia with cricopharyngeus muscle dysfunction (CPD). Methods We reviewed videofluoroscopic swallowing studies (VFSS) conducted in the Department of Physical Medicine and Rehabilitation, Myongji Hospital from January through Decemb...

  11. The removal of intravascular bullets by interventional radiology: the prevention of central migration by balloon occlusion--case report.

    Science.gov (United States)

    Sclafani, S J; Shatzkes, D; Scalea, T

    1991-10-01

    A migratory intravascular bullet fragment located within the hypogastric vein was removed successfully with the aid of interventional radiologic techniques. The authors describe the use of the technique of balloon trapping as part of this procedure. A balloon should be inflated between the foreign body and the heart before retrieval is attempted in order to prevent migration back to the heart during the manipulation.

  12. Treatment of hepatic venous stenosis by transfemoral venous balloon dilation following living donor liver transplantation: a case report

    Institute of Scientific and Technical Information of China (English)

    Weiwei Jiang; Yangsui Liu; Lianbao Kong

    2009-01-01

    Hepatic venous stenosis may be a cause of graft failure in living donor liver transplantation (LDLT). Balloon dilation and metallic frame approaches have been used successfully to treat hepatic venous stenosis. Here, we report the effect of transfemoral venous balloon dilation for treating a child with hepatic venous stenosis after LDLT.

  13. Microbiological sampling of the atmosphere using a latex sounding balloon

    Science.gov (United States)

    Adkins, W. P.; Bryan, N.; Christner, B. C.; Guzik, T. G.; Stewart, M. F.; Giammanco, J. R.

    2010-12-01

    The occurrence of microbes in the atmosphere has been the subject of scientific inquiry since Louis Pasteur’s time; however, data on the nature and diversity of microbial life in the upper troposphere and stratosphere is very limited. To experimentally address this, we have designed, constructed, and field-tested a lightweight, autonomous system that can sample at high altitudes using a latex sounding balloon. An important aspect of our sampling protocol is the ability to decontaminate and assess the level of background contamination during laboratory and field handling. Our approach involves the parallel decontamination and monitoring of 3 identical payloads: (i) one that remains in the laboratory, (ii) a control on the flight string, and (iii) a payload that opens and samples airborne particles in the atmosphere. Comparative analysis of various sterilization methods indicated that ethylene oxide was most effective at decreasing the concentration of DNA-containing cells, decreasing background cellular contamination by 94%. In conjunction, germicidal ultraviolet light, sodium hypochlorite, and 70% ethanol were used to decrease the concentration of microbes associated with payload surfaces. Bioaerosol collection is achieved by impact sampling on a 3.5 mm^2 retention surface covered with a thin layer of sterile silicone grease as the payload travels through the atmosphere. Initial flights have been successful in recovering viable microorganisms present in parcels of air at altitudes of 3 km to 9 km. Microscopic analysis on the collected cell assemblages implied that ~70% of the cells were potentially viable, and aerobic heterotrophic bacteria were cultured and isolated from liquid and agar-solidified culture media. Future plans include increasing the sampling altitude up to ~30 km in a series of discrete steps, maintaining our background controls and connection to lower altitude measurements. The pressure, temperature, and radiation levels in Earth’s stratosphere

  14. Exploring the interior structure of Venus with balloons and satellites

    Science.gov (United States)

    Mimoun, David; Cutts, Jim; Stevenson, Dave

    2015-04-01

    Although present daily in our sky as the brightest object at dusk and dawn, many characteristics of Venus remains a mystery. Its dense atmosphere hides the surface from orbital viewing, and the extreme conditions experienced at its surface (460°C, almost 100 bar of pressure at the surface) pose a formidable challenge to the sustained survival and operation of planetary landers. Despite their sharply contrasting atmospheres, Venus is not very different from Earth in size, its composition should be very similar, its orbit is very close to be circular and it is only a little closer to the Sun ( 0.7 A.U). So what are the processes that turned the twin sister of our planet into such a different object? And how can we better understand the processes that have shaped the terrestrial planets, and to understand their formation history? With its harsh surface environment, conventional seismology on Venus, requiring seismometers to be deployed at the surface for months or even years seems impractical. In June 2014, the Keck Institute for Space Studies (KISS) at the California Institute of Technology sponsored a one-week workshop with 30 specialists in the key techniques and technologies relevant to investigating Venus's interior structure focusing on alternative approaches to seismology . As the vertical component of surface motion on Venus is very efficiently coupled into the atmosphere as infrasonic waves, especially at low frequency, several alternative approaches to detecting seismic events can be considered. Seismo-acoustic waves propagate upwards producing pressure fluctuations in the middle atmosphere of Venus and the seismic wave energy is ultimately dissipated by local heating, ionospheric perturbation, or airglow. These atmospheric perturbations can therefore be recorded either in-situ (with a barometer network, deployed on balloons floating in the cloud layer near 55 km) or remotely via optical imaging or electromagnetic sounding deployed on a spacecraft. A report

  15. 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

  16. 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

  17. Balloon aortic valvuloplasty as a bridge to aortic valve surgery for severe aortic stenosis.

    Science.gov (United States)

    Nwaejike, Nnamdi; Mills, Keith; Stables, Rod; Field, Mark

    2015-03-01

    A best evidence topic in cardiac surgery was written according to a structured protocol. The question addressed was, in patients with severe aortic stenosis, can balloon valvuloplasty be used as a bridge to aortic valve replacement? Altogether 463 papers were found using the reported search, of which 11 papers represented the best evidence to answer the clinical question. The authors, journal, date and country of publication, patient group studied, study type, relevant outcomes and results of these papers are tabulated. We conclude that balloon aortic valvuloplasty is recommended as a bridge to aortic valve replacement (AVR) or transcatheter aortic valve implantation (TAVI) in patients with severe symptomatic aortic stenosis. Institutional practices, local and logistic factors can affect patient selection and management approaches to severe aortic stenosis, but having the facility to offer balloon aortic valvuloplasty (especially in the TAVI era) provides another management option for patients who would otherwise have been considered unacceptably high risk for aortic valve surgery. The increased incidence of balloon aortic valvuloplasty mirrors the increase in the use of TAVI with a sharp increase in activity from 2006. Success rates for bridging from balloon aortic valvuloplasty to definite surgical intervention are in the range 26.3-74%, with AVR or TAVI occurring within 8 weeks to 7 months. Complications from balloon aortic valvuloplasty such as aortic regurgitation (AR) can be managed successfully. Up to 40% of patients selected by balloon aortic valvuloplasty to have TAVI or AVR do not have these procedures within 2 years. While most of these patients are excluded for objective clinical reasons such as terminal disease/malignancy or other persistent contraindication, some patients refuse definitive treatment and others die while on the waiting list. Outcomes in patients bridged to AVR/TAVI are better than in patients treated with balloon aortic valvuloplasty

  18. A self-contained 3He refrigerator suitable for long duration balloon experiments

    Science.gov (United States)

    Masi, S.; Aquilini, E.; Cardoni, P.; de Bernardis, P.; Martinis, L.; Scaramuzzi, F.; Sforna, D.

    We describe the design, development and test of a self-contained 3He fridge, aimed to cool at ≲0.3 K a bolometric detection system with a hold time of two weeks. The system is robust and suitable for operation on a long-duration stratospheric balloon payload. A physical model of the fridge has been developed, which describes the measured hold time, limiting temperature and load curve of the fridge. The system has been flight tested successfully during two balloon flights of the BOOMERanG payload in summer 1997.

  19. Certification and safety aspects relating to the transport of passengers on high altitude balloons in Europe

    Science.gov (United States)

    Schoenmaker, Annelie

    2014-07-01

    High-altitude balloons typically fly between 25 and 50 km in altitude, which, while below the Karman line of 100 km, is yet far above the altitudes typically flown by aircraft. For example, the highest-flying commercial aircraft - the Concorde - had a maximum cruising altitude of only 18 km. zero2infinity, a Spanish company, is currently developing a pressurized pod named “bloon” which will be capable of lifting six people, including two pilot crew members and four paying passengers, to an altitude of 36 km through the use of high-altitude balloons. The boundary between Airspace and Outer Space has never been legally defined, mostly because of the lack of activities taking place between the altitude where airplanes fly and the lowest orbiting spacecraft. High-altitude balloons do fly at these in-between altitudes and the prospect of commercializing access to these parts of the stratosphere poses some questions in a new light. Given the relatively low altitude at which they fly, it may well be that these types of balloons would be considered to operate exclusively within air space. However, given the technology involved in crewed high altitude balloon flights, which is more similar to spacecraft engineering than to traditional hot-air or gas ballooning, it is necessary to evaluate the various legal regimes, codes, and regulations that would apply to such flights, especially regarding licenses and liabilities. For high altitude balloon flights commencing in Europe, the European Aviation Safety Agency (EASA) would very likely be the competent certification or licensing agency for these flights, although there would likely be input from various national aviation authorities as well. However, because the European Commission (EC) has not yet issued regulations regarding commercial spaceflight, particularly the use of high altitude balloons, new rules and regulations governing such flights may still need to be drafted and promulgated. With the development of

  20. PoGOLino: A scintillator-based balloon-borne neutron detector

    Energy Technology Data Exchange (ETDEWEB)

    Kole, Merlin, E-mail: merlin@particle.kth.se [KTH Royal Institute of Technology, Department of Physics, 106 91 Stockholm (Sweden); The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, 106 91 Stockholm (Sweden); Chauvin, Maxime [KTH Royal Institute of Technology, Department of Physics, 106 91 Stockholm (Sweden); The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, 106 91 Stockholm (Sweden); Fukazawa, Yasushi [Department of Physical Science, Hiroshima University, Hiroshima 739-8526 (Japan); Fukuda, Kentaro; Ishizu, Sumito [Tokuyama Corporation, Shunan, Yamaguchi (Japan); Jackson, Miranda [KTH Royal Institute of Technology, Department of Physics, 106 91 Stockholm (Sweden); The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, 106 91 Stockholm (Sweden); Kamae, Tune [University of Tokyo, Department of Physics, 113-0033 Tokyo (Japan); Kawaguchi, Noriaki [Tokuyama Corporation, Shunan, Yamaguchi (Japan); Kawano, Takafumi [Department of Physical Science, Hiroshima University, Hiroshima 739-8526 (Japan); Kiss, Mózsi; Moretti, Elena; Pearce, Mark; Rydström, Stefan [KTH Royal Institute of Technology, Department of Physics, 106 91 Stockholm (Sweden); The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, 106 91 Stockholm (Sweden); Takahashi, Hiromitsu [Department of Physical Science, Hiroshima University, Hiroshima 739-8526 (Japan); Yanagida, Takayuki [Kyushu Institute of Technology, Kitakyushu, Fukuoka (Japan)

    2015-01-11

    PoGOLino is a balloon-borne scintillator-based experiment developed to study the largely unexplored high altitude neutron environment at high geomagnetic latitudes. The instrument comprises two detectors that make use of LiCAF, a novel neutron sensitive scintillator, sandwiched by BGO crystals for background reduction. The experiment was launched on March 20th 2013 from the Esrange Space Centre, Northern Sweden (geomagnetic latitude of 65°), for a three hour flight during which the instrument took data up to an altitude of 30.9 km. The detector design and ground calibration results are presented together with the measurement results from the balloon flight.

  1. 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.

  2. PoGOLino: a scintillator-based balloon-borne neutron detector

    CERN Document Server

    Kole, Merlin; Fukazawa, Yasushi; Fukuda, Kentaro; Ishizu, Sumito; Jackson, Miranda; Kamae, Tune; Kawaguchi, Noriaki; Kawano, Takafumi; Kiss, Mozsi; Moretti, Elena; Pearce, Mark; Rydström, Stefan; Takahashi, Hiromitsu; Yanagida, Takayuki

    2014-01-01

    PoGOLino is a balloon-borne scintillator-based experiment developed to study the largely unexplored high altitude neutron environment at high geomagnetic latitudes. The instrument comprises two detectors that make use of LiCAF, a novel neutron sensitive scintillator, sandwiched by BGO crystals for background reduction. The experiment was launched on March 20th 2013 from the Esrange Space Centre, Northern Sweden (geomagnetic latitude of $65^\\circ$), for a three hour flight during which the instrument took data up to an altitude of 30.9 km. The detector design and ground calibration results are presented together with the measurement results from the balloon flight.

  3. Stabilisation of ballooning modes in torsatrons with an externally applied toroidal current

    Energy Technology Data Exchange (ETDEWEB)

    Cooper, W.A. [Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)

    1996-09-01

    It has been found that ideal ballooning modes can impose very restrictive volume average {beta} limits in torsatrons much below the typical values close to 5% that are required to be economically realisable as reactor systems and it has been shown that externally applied toroidal currents that are peaked can destabilise the Mercier criterion in this type of configuration. We will show here that if the applied currents are hollow, they can stabilise the ballooning modes without triggering Mercier instabilities and as a result raise the limiting {beta}* from 2% to 5%. (author) 3 figs., 10 refs.

  4. Proceedings of the 3rd workshop on balloon-borne experiments with superconducting magnet spectrometers

    International Nuclear Information System (INIS)

    The Third Work Shop on Balloon Borne Experiment with a Superconducting Magnet Spectrometer was held at National Laboratory for High Energy Physics (KEK), Tsukuba, Japan on February 24 - 25, 1992. The main effort for this workshop was focused on the progress of the BESS (Balloon Borne Experiment with a Superconducting Spectrometer) experiment and on the scope for scientific investigation with the BESS detector. The progress was reviewed and further investigation was discussed for the BESS further scientific collaboration among Univ. of Tokyo, Kobe University, KEK, ISAS and NMSU. (J.P.N.)

  5. 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.

  6. The Cosmic Foreground Explorer (COFE): A balloon-borne microwave polarimeter to characterize polarized foregrounds

    CERN Document Server

    Leonardi, Rodrigo; Bersanelli, Marco; Ferreira, Ivan; Lubin, Philip M; Meinhold, Peter R; O'Neill, Hugh; Stebor, Nathan C; Villa, Fabrizio; Villela, Thyrso; Wuensche, Carlos A

    2006-01-01

    The COsmic Foreground Explorer (COFE) is a balloon-borne microwave polarime- ter designed to measure the low-frequency and low-l characteristics of dominant diffuse polarized foregrounds. Short duration balloon flights from the Northern and Southern Hemispheres will allow the telescope to cover up to 80% of the sky with an expected sensitivity per pixel better than 100 $\\mu K / deg^2$ from 10 GHz to 20 GHz. This is an important effort toward characterizing the polarized foregrounds for future CMB experiments, in particular the ones that aim to detect primordial gravity wave signatures in the CMB polarization angular power spectrum.

  7. 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)

  8. 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

  9. An Automated System for Measuring Microphysical and Radiative Cloud Characteristics from a Tethered Balloon

    Energy Technology Data Exchange (ETDEWEB)

    Dr. Paul Lawson

    2004-03-15

    OAK-B135 The rate of climate change in polar regions is now felt to be a harbinger of possible global warming. Long-lived, relatively thin stratus clouds play a predominant role in transmitting solar radiation and trapping long wave radiation emitted from open water and melt ponds. In situ measurements of microphysical and radiative properties of Arctic and Antarctic stratus clouds are needed to validate retrievals from remote measurements and simulations using numerical models. While research aircraft can collect comprehensive microphysical and radiative data in clouds, the duration of these aircraft is relatively short (up to about 12 hours). During the course of the Phase II research, a tethered balloon system was developed that supports miniaturized meteorological, microphysical and radiation sensors that can collect data in stratus clouds for days at a time. The tethered balloon system uses a 43 cubic meter balloon to loft a 17 kg sensor package to altitudes u p to 2 km. Power is supplied to the instrument package via two copper conductors in the custom tether. Meteorological, microphysical and radiation data are recorded by the sensor package. Meteorological measurements include pressure, temperature, humidity, wind speed and wind direction. Radiation measurements are made using a 4-pi radiometer that measures actinic flux at 500 and 800 nm. Position is recorded using a GPS receiver. Microphysical data are obtained using a miniaturized version of an airborne cloud particle imager (CPI). The miniaturized CPI measures the size distribution of water drops and ice crystals from 9 microns to 1.4 mm. Data are recorded onboard the sensor package and also telemetered via a 802.11b wireless communications link. Command signals can also be sent to the computer in the sensor package via the wireless link. In the event of a broken tether, a GMRS radio link to the balloon package is used to heat a wire that burns 15 cm opening in the top of the balloon. The balloon and

  10. Efficacy analysis of endoscopic sphincterotomy plus endoscopic papillary balloon dilation for remove of common bile duct stons%内镜下乳头小切开联合球囊扩张治疗胆总管结石临床疗效分析

    Institute of Scientific and Technical Information of China (English)

    闫方博; 张健康

    2014-01-01

    Objective To explore the effectiveness and safety of endoscopic sphincterotomy(EST)plus endoscopic pap-illary balloon dilation (EPBD) for the removal of common bile duct stones. Methods One hundred patients who re-ceived endoscopic retrograde pancreatic angiography(ERCP)in the first hospital of shanxi medical university from June 2012 to March 2014 were randomly divided into EST group and ESBD group. ESBD group in advance nipples small in-cision after balloon expansion; EST group used normal operation. The successful rate of stone clear-ance,operation time,the rate of mechanical lithotripsy and related complications were observed.Results After one time,all stones were removed one time from 46 cases(92%) assigned EST and 48 cases(96%) assigned EPBD(P>0.05); Mechanical lithotripsy was used to fragment stones 8 cases(16%) in EST group and 2 cases(4%) in ESBD group(P0.05); Average operation time,respectively (45.3±13.0) min and (30.5±9.2) min(P0.05);使用机械碎石分别有8例(16%)和2例(4%),差异有统计学意义(P0.05);两组平均操作时间分别为(45.3±13.0)min和(30.5±9.2)min,差异有统计学意义(P<0.05)。结论内镜下乳头括<肌小切开联合球囊扩张术取石成功率及术后并发症发生率与常规括<肌切开术相当,但平均操作时间及使用机械碎石的机率与EST相比较低,是治疗胆总管结石安全、有效的方法。

  11. Navigation for fluoroscopy-guided cryo-balloon ablation procedures of atrial fibrillation

    Science.gov (United States)

    Bourier, Felix; Brost, Alexander; Kleinoeder, Andreas; Kurzendorfer, Tanja; Koch, Martin; Kiraly, Attila; Schneider, Hans-Juergen; Hornegger, Joachim; Strobel, Norbert; Kurzidim, Klaus

    2012-02-01

    Atrial fibrillation (AFib), the most common arrhythmia, has been identified as a major cause of stroke. The current standard in interventional treatment of AFib is the pulmonary vein isolation (PVI). PVI is guided by fluoroscopy or non-fluoroscopic electro-anatomic mapping systems (EAMS). Either classic point-to-point radio-frequency (RF)- catheter ablation or so-called single-shot-devices like cryo-balloons are used to achieve electrically isolation of the pulmonary veins and the left atrium (LA). Fluoroscopy-based systems render overlay images from pre-operative 3-D data sets which are then merged with fluoroscopic imaging, thereby adding detailed 3-D information to conventional fluoroscopy. EAMS provide tracking and visualization of RF catheters by means of electro-magnetic tracking. Unfortunately, current navigation systems, fluoroscopy-based or EAMS, do not provide tools to localize and visualize single shot devices like cryo-balloon catheters in 3-D. We present a prototype software for fluoroscopy-guided ablation procedures that is capable of superimposing 3-D datasets as well as reconstructing cyro-balloon catheters in 3-D. The 3-D cyro-balloon reconstruction was evaluated on 9 clinical data sets, yielded a reprojected 2-D error of 1.72 mm +/- 1.02 mm.

  12. Per anal balloon dilatation of a post-necrotizing enterocolitis stricture of the sigmoid colon

    Energy Technology Data Exchange (ETDEWEB)

    Renfrew, D.L.; Smith, W.L.; Pringle, K.C.

    1986-05-01

    Per anal balloon dilatation of a sigmoid colon stricture caused by necrotizing enterocolitis allowed identification of a more proximal lesion which would otherwise have gone radiographically undetected. Repeated dilatations at two weeks and four weeks following the initial dilatation of the stricture resulted in relief of the stricture and obviated the need for surgical treatment of this lesion.

  13. BTEB2 antisense RNA inhibits intimal hyperplasia in a rat carotid balloon injury model

    Institute of Scientific and Technical Information of China (English)

    LI De; HE Guo-xiang; TANG Bing; TANG Bo

    2006-01-01

    Objective: To investigate the effects of basic transcriptional element binding protein-2(BTEB2) antisense RNA on vascular smooth muscle cells (VSMCs) proliferation and the neointimal formation after carotid balloon injury in rats. Methods: The cultured VSMCs were transfected with an adenoviral vector containing BTEB2 antisense gene, Ad ASBTEB2. Effects of BTEB2 antisense RNA on the expression of BTEB2 were investigated by Western blot analysis. The cell cycle was analyzed using flow cytometry. Ad ASBTEB2, control adenoviral vector Ad. LacZ or PBS was transduced into the rat carotid artery after balloon injury. The expression of BTEB2 at 7, 14, and 21 d after gene transfer was detected by immunohistochemistry and neointima-to-media (I/M) area ratio at these time points was calculated. Results: The cell cycle was arrested in G0/G1 phase and the expression of BETB2 was downregulated after transfection with Ad ASBTEB2. Ad ASBTEB2 treatment reduced I/M area ratios on day 7, 14, and 21 after injury by 45%, 50% and 53% respectively, whereas the Ad LacZ treatment did not significantly alter these ratios compared with control group. Conclusion: BTEB2 antisense RNA mediated by adenoviral vector inhibits proliferation of VSMCs and significantly reduces neointimal hyperplasia in the rat carotid balloon injury model. BTEB2 antisense RNA is a potential therapeutic approach to preventing neointimal formation after balloon injury.

  14. A system for visualization and automatic placement of the endoclamp balloon catheter

    NARCIS (Netherlands)

    Furtado, H.; Stüdeli, T.; Sette, M.; Samset, E.; Gersak, B.

    2010-01-01

    The European research network "Augmented Reality in Surgery" (ARIS*ER) developed a system that supports minimally invasive cardiac surgery based on augmented reality (AR) technology. The system supports the surgical team during aortic endoclamping where a balloon catheter has to be positioned and ke

  15. The Effect of Plasma Beta on High-n Ballooning Stability at Low Magnetic Shear

    OpenAIRE

    Connor, J. W.; Ham, C. J.; Hastie, R. J.

    2016-01-01

    An explanation of the observed improvement in H-mode pedestal characteristics with increasing core plasma pressure or poloidal beta, as observed in MAST and JET, is sought in terms of the impact of the Shafranov shift, d', on ideal ballooning MHD stability.

  16. Peripheral Applications of Drug-Coated Balloons: Past, Present and Future

    Energy Technology Data Exchange (ETDEWEB)

    Krokidis, Miltiadis, E-mail: mkrokidis@hotmail.com; Spiliopoulos, Stavros, E-mail: stavspiliop@upatras.gr; Katsanos, Konstantinos, E-mail: katsanos@med.upatras.gr; Sabharwal, Tarun, E-mail: tarun_sabharwal@yahoo.co.uk [Guy' s and St. Thomas' Hospitals, NHS Foundation Trust, Department of Radiology (United Kingdom)

    2013-04-15

    Drug-coated balloon (DCB) technologies represent the latest and hottest development in the field of endovascular treatment of peripheral arterial disease. Initial experience with paclitaxel-coated balloon use in the femoral artery has demonstrated lower mid-term restenosis and superior mid-term clinical outcomes in terms of improved wound healing and reduced repeat angioplasty rates compared with standard balloon angioplasty. Many companies are presently developing and/or improving DCB catheters and therefore ongoing, technical improvements of the already existing platforms, new drugs, and innovative carriers are expected. The ongoing basic research studies and various multicenter randomized, controlled trials that are currently in progress will offer valuable scientific insights regarding the long-term effectiveness and other crucial issues, such as efficacy in various vascular beds, optimal balloon dosage, and post angioplasty antiplatelet therapy. Future applications of these devices also could include in-stent restenosis, anastomotic stenosis of surgical bypass, and benign stenoses of the central venous system. The authors envision that DCB angioplasty will evolve to a major paradigm shift in the endovascular treatment of occlusive vascular diseases.

  17. Gastro-oesophageal reflux in mechanically ventilated patients: effects of an oesophageal balloon.

    Science.gov (United States)

    Orozco-Levi, M; Félez, M; Martínez-Miralles, E; Solsona, J F; Blanco, M L; Broquetas, J M; Torres, A

    2003-08-01

    Gastro-oesophageal reflux (GOR) and bronchoaspiration of gastric content are risk factors linked with ventilator-associated pneumonia. This study was aimed at evaluating the effect of a nasogastric tube (NGT) incorporating a low-pressure oesophageal balloon on GOR and bronchoaspiration in patients receiving mechanical ventilation. Fourteen patients were studied in a semi-recumbent position for 2 consecutive days. Inflation or deflation of the oesophageal balloon was randomised. Samples of blood, gastric content, and oropharyngeal and bronchial secretions were taken every 2 h over a period of 8 h. A radioactively labelled nutritional solution was continuously administered through the NGT. The magnitude of both the GOR and bronchoaspiration was measured by radioactivity counting of oropharyngeal and bronchial secretion samples, respectively. Inflation of the oesophageal balloon resulted in a significant decrease of both GOR and bronchoaspiration of gastric content. This protective effect was statistically significant from 4 h following inflation throughout the duration of the study. This study demonstrates that an inflated oesophageal balloon delays and decreases gastro-oesophageal and bronchial aspiration of gastric content in patients carrying a nasogastric tube and receiving enteral nutrition during mechanical ventilation. Although the method was found to be safe when applied for 8 h, longer times should be considered with caution. PMID:12952272

  18. Observing Boundary-Layer Winds from Hot-Air Balloon Flights

    NARCIS (Netherlands)

    Bruijn, de E.I.F.; Haan, de S.; Bosveld, F.C.; Wichers Schreur, B.G.J.; Holtslag, A.A.M.

    2016-01-01

    High-resolution upper-air wind observations are sparse, and additional observations are a welcome source of meteorological information. In this paper the potential of applying balloon flights for upper-air wind measurements is explored, and the meteorological content of this information is investiga

  19. 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.

  20. 络筒的气圈和张力%Balloon and tension in winding

    Institute of Scientific and Technical Information of China (English)

    王元昌; 薛卫; 肖荣

    2003-01-01

    In winding, when the yarn is unwinding from the cop under certain conditions it may form multi-sections balloon. The balloon is the rotational standing wave according to the string vibration theory. Applying this theory, the calculation of the yarn initial tension in winding is more correct than others, and the winding balloon phenomenon may be explained perfectly. It has been proved mathematically that the string vibration will form standing waves if its upper end is fixed while the lower end moves round a circle. In this paper, the authors point out that the study of the shapes, sections and tension of unwinding balloon in winding must be based upon the theory of string vibration.%从数学上证明了上端固定、下端作圆周运动的弦振动会形成驻波.在络筒工程中,一定条件下纱从管纱上退绕,会形成多节气圈,它是一种旋转的驻波.用此理论计算络筒的初始张力,比其它公式要好,而且可完美地解释气圈观象.文中还指出,对气圈形状、节数和张力的研究应该以弦振动理论为基础.

  1. Response of Balloon-Expandable Endoprosthetic Metallic Stents Subjected to Over-Expansion In Vitro

    International Nuclear Information System (INIS)

    We attempted to evaluate the in vitro behavior and performance of balloon-expandable endoprosthetic metallic stents subjected to over-expansion (OE). Seventy-two balloon-expandable endoprosthetic stents, representing 22 models from six manufacturers, were over- expanded in vitro. Stents were initially expanded to their maximum manufacturer- recommended diameter and then over-expanded incrementally to their endpoints. Endpoints for OE were either stent disarticulation or an inability to undergo further expansion despite balloon insufflation to maximum burst pressure. Measurements of stent dimensions were recorded at each overexpanded diameter and comparisons were made to manufacturer's specifications. A total of 288 balloon-driven expansions were performed on 72 stents. Sixteen stents were expanded to large diameters (≥ 16 mm), 20 stents underwent OE of 50% or greater. One model tended to disarticulate after OE greater than 50%. There were five models that had a tendency to disarticulate after minimal OE. Five models were resistant to OE (25% or less OE) but did not disarticulate. Nearly all stents showed some degree of foreshortening with OE, while 36 stents underwent foreshortening of 30% or more. Models that are not recommended for OE include Intrastent, Intrastent DoubleStrut, NIR Royale and Omniflex. Good candidates for OE include Intrastent DoubleStrut LD, Palmaz large, Medtronic Extra Support Biliary Plus and Medtronic Flexible Biliary. Palmaz XL remains the only model available for expansion from 20 to 28 mm in diameter. For the remaining stents, OE is possible, however, caution should be used

  2. Stability of Tokamak Equilibrium with Internal Transport Barrier against High-n MHD Ballooning Mode

    Institute of Scientific and Technical Information of China (English)

    SHI Bing-Ren; QU Wen-Xiao; DONG Jia-Qi

    2006-01-01

    @@ A new eigen-mode equation for the tokamak high-n (the toroidal mode number) ideal magnetohydrodynamic (MHD) ballooning mode in tokamak plasmas is derived to include the toroidal effects that are significant for stability of configurations with internal transport barriers (ITBs).

  3. 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.

  4. An Overview of High-Altitude Balloon Experiments at the Indian Institute of Astrophysics

    CERN Document Server

    Safonova, Margarita; Sreejith, A G; Mathew, Joice; Sarpotdar, Mayuresh; Ambily, S; Nirmal, K; Talnikar, Sameer; Hadigal, Shripathy; Prakash, Ajin; Murthy, Jayant

    2016-01-01

    The High-Altitude Ballooning programme began at Indian Institute of Astrophysics, Bangalore, in the year 2011 with the primary purpose of developing and flying low-cost scientific payloads on a balloon-borne platform. Some of the science goals are studies of the phenomena occurring in the upper atmosphere, of airglow and zodiacal light, and observations of extended astronomical objects such as, for example, comets, from near space (20 to 30 km). A brief summary and results of the tethered flights carried out at CREST campus are given in Ref.~1. Here we present a complete overview of the 9 free-flying balloon experiments conducted from March 2013 to November 2014. We describe the launch procedures, payloads, methods of tracking and recovery of the payloads. Since we fall in the light/medium balloon category, the weight of the payload is limited to less than 5 kg --- we use a 3-D printer to fabricate lightweight boxes and structures for our experiments. We are also developing in-house lightweight sensors and co...

  5. Postpartum cerebral angiopathy: atypical features and treatment with intracranial balloon angioplasty

    International Nuclear Information System (INIS)

    Postpartum cerebral angiopathy (PCA) is an uncommon cause of ischemic and hemorrhagic stroke in young women. It is usually clinically benign and not relapsing. We describe a patient with non-hemorrhagic PCA who had an atypical progressive neurological deficit from bilateral hemisphere watershed ischemia despite treatment with aggressive medical therapy and intracranial balloon angioplasty. (orig.)

  6. Postpartum cerebral angiopathy: atypical features and treatment with intracranial balloon angioplasty

    Energy Technology Data Exchange (ETDEWEB)

    Song, J.K. [Center for Endovascular Surgery, Hyman-Newman Inst. for Neurology and Neurosurgery, New York, NY (United States); Cacayorin, E.D. [Interventional Neuroradiology, Dept. of Radiology, Univ. of Texas Medical School, Houston, TX (United States); Fisher, S.; Seifert, T.D.; Alexandrov, A.V.; Malkoff, M.D.; Grotta, J.C.; Campbell, M.S. [Div. of Stroke Neurology, Dept. of Neurology, Univ. of Texas Medical School, Houston, TX (United States)

    2004-12-01

    Postpartum cerebral angiopathy (PCA) is an uncommon cause of ischemic and hemorrhagic stroke in young women. It is usually clinically benign and not relapsing. We describe a patient with non-hemorrhagic PCA who had an atypical progressive neurological deficit from bilateral hemisphere watershed ischemia despite treatment with aggressive medical therapy and intracranial balloon angioplasty. (orig.)

  7. Balloon-borne hard X-ray polarimetry with PoGOLite

    CERN Document Server

    ,

    2012-01-01

    PoGOLite is a hard X-ray polarimeter operating in the 25-100 keV energy band. The instrument design is optimised for the observation of compact astrophysical sources. Observations are conducted from a stabilised stratospheric balloon platform at an altitude of approximately 40 km. The primary targets for first balloon flights of a reduced effective area instrument are the Crab and Cygnus-X1. The polarisation of incoming photons is determined using coincident Compton scattering and photo-absorption events reconstructed in an array of plastic scintillator detector cells surrounded by a bismuth germanate oxide (BGO) side anticoincidence shield and a polyethylene neutron shield. A custom attitude control system keeps the polarimeter field-of-view aligned to targets of interest, compensating for sidereal motion and perturbations such as torsional forces in the balloon rigging. An overview of the PoGOLite project is presented and the outcome of the ill-fated maiden balloon flight is discussed.

  8. 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.

  9. Migration of BTEX and phthalates from natural rubber latex balloons obtained from the Sri Lankan market.

    Science.gov (United States)

    Jayawardena, Imanda; Godakumbura, Pahan I; Prashantha, M A B

    2016-01-01

    The current study evaluates the migration of benzene, toluene, ethylbenzene, xylene (BTEX) and phthalates into artificial saliva from natural rubber latex (NRL) balloons available for sale in Sri Lanka. It was discovered that at least one BTEX compound migrated from almost all the brands. The migration of four phthalates; diethyl phthalate, dibutyl phthalate, di-isobutyl phthalate and butyl benzyl phthalate were also observed. Migratory levels of BTEX and phthalates in most of the balloon brands were above the permissible levels set by the European Union. Assessment of factors affecting the migratory levels indicated migration under active mouthing conditions and migration from the neck region of the balloons were significantly higher. The migratory levels were observed to decrease with storage time, and in certain brands the BTEX levels decreased below the permissible level. One-way ANOVA indicated no significant differences (p ≥ 0.05) in migratory levels of each individual compound within the same brand for both BTEX and phthalates. When compared among different brands, BTEX levels indicated significant differences (p ≤ 0.05), while phthalate levels were observed to not be significantly different (p ≥ 0.05). A significant difference was also observed (p ≤ 0.05) among the migratory levels of compounds under each test condition evaluated as factors affecting the migratory level. Furthermore, the solvent based colorants added to color the latex were found to be the source of BTEX and phthalates in the NRL balloons.

  10. Measurements of the vertical atmospheric electric field and of the electrical conductivity with stratospheric balloons

    Science.gov (United States)

    Iversen, I. B.; Madsen, M. M.; Dangelo, N.

    1985-01-01

    Measurements of the atmospheric (vertical) electric field with balloons in the stratosphere are reported. The atmospheric electrical conductivity is also measured and the current density inferred. The average vertical current shows the expected variation with universal time and is also seen to be influenced by external (magnetospheric) electric fields.

  11. Effect of balloon atrial septostomy on cerebral oxygenation in neonates with transposition of the great arteries

    NARCIS (Netherlands)

    van der Laan, Michelle E.; Verhagen, Elise A.; Bos, Arend F.; Berger, Rolf M. F.; Kooi, Elisabeth M. W.

    2013-01-01

    BACKGROUND: The aim of this study was to determine the effect of balloon atrial septostomy (BAS) on cerebral oxygenation in neonates with transposition of the great arteries (TGA). METHODS: In term neonates with TGA, regional cerebral tissue oxygen saturation (r(c)SO(2)) was measured using, near-inf

  12. Cephalic arch stenosis in autogenous brachiocephalic hemodialysis fistulas: results of cutting balloon angioplasty

    DEFF Research Database (Denmark)

    Heerwagen, Søren Thorup; Lönn, Lars; Schroeder, Torben V;

    2010-01-01

    Cephalic arch stenosis is a known cause of hemodialysis access failure in patients with brachiocephalic fistulas (BCFs). Outcomes of endovascular treatment are affected by resistance of the stenosis to balloon dilation, a high vein rupture rate and the development of early restenosis. The purpose...

  13. Failure of Sengstaken balloon tamponade for rebleeding after tissue adhesive injection in a fundic varix

    NARCIS (Netherlands)

    Nieuwenhuis, JA; Peters, FTM; Sanders, J; Van der Werf, TS; Zijlstra, JG

    1998-01-01

    A 61-year-old man developed a huge fundic varix due to portal hypertension in alcoholic liver cirrhosis. After a third injection therapy session with tissue adhesive (Histoacryl(R)) massive hemorrhage developed. Sengstaken (gastric) balloon tamponade failed. Autopsy showed a huge, solid varix with a

  14. Balloon-occluded percutaneous transheptic obliteration of isolated vesical varices causing gross hematuria

    Energy Technology Data Exchange (ETDEWEB)

    Lim, Dong Hoon; Kim, Dong Hyun; Kim, Min Seok; Kim, Chul Sung [Department of Urology, College of Medicine, Chosun University, Gwangju (Korea, Republic of)

    2013-01-15

    Gross hematuria secondary to vesical varices is an unusual presentation. We report such a case recurrent gross hematuria in a male patient who had a history of bladder substitution with ileal segments that had been treated by balloon-occluded percutaneous transhepatic obliteration of vesical varices.

  15. Wiktor stent implantation in patients with restenosis following balloon angioplasty of a native coronary artery

    NARCIS (Netherlands)

    P.W.J.C. Serruys (Patrick); M.E. Bertrand (Michel); V. Wiegand; G. Kober; J.F. Marquis; B. Valeix; R. Uebis; J. Piessen; P.P.T. de Jaegere (Peter)

    1992-01-01

    textabstractIntracoronary stenting has been introduced as an adjunct to balloon angioplasty aimed at overcoming its limitations, namely acute vessel closure and late restenosis. This study reports the first experience with the Wiktor stent implanted in the first 50 consecutive patients. All patients

  16. 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

  17. Validation and retrieval of IASI measurements with IASI-balloon correlative measurements

    Science.gov (United States)

    Payan, Sébastien; Camy-Peyret, Claude; Pondrom, Marc; Té, Yao; Jeseck, Pascal; Bureau, Jérôme; Pépin, Isabelle

    2010-05-01

    Because of the increase of anthropogenic greenhouse gases and pollutants in the atmosphere since pre-industrial times and their impact on the environment (ozone hole, air quality, acid rains, greenhouse effect), in situ and remote-sensing measurements of atmospheric composition are carried out by a wide variety of instruments, using different measurement principles and different platforms (ground, aircrafts, balloons, satellites). The IASI (Infrared Atmospheric Sounding Interferometer) instrument, consisting of a nadir-looking thermal infrared Fourier transform spectrometer, which was launched onboard the MetOp-A platform on 19th October 2006, is dedicated to operational meteorology. However, IASI spectra have demonstrated a huge potential for retrieving trace gases such as ozone (O3), methane (CH4), carbon monoxide (CO) and many others. In this framework the LPMAA (Laboratoire de Physique Moléculaire pour l'Atmosphère et l'Astrophysique) developed a balloon-borne Fourier transform infrared (FTIR) spectrometer called IASI-balloon to record high resolution (0.1 cm-1 apodised) spectra of the atmosphere / surface system in the nadir looking geometry. Several flight of this balloon experiments have been performed allowing to provided a large number of thermal emission nadir looking FTIR spectra in the 650 - 3000 cm-1 region, recorded from float at about 35 km altitude. We retrieved profiles and/or columns of H2O, CO2, O3, N2O, CO and CH4. For a flight performed from Teresina, Brazil, the spectra recorded during the balloon flight are in good coincidence with IASI-MetOp measurements. We used this set of data to test the impact on the retrieval of a new cloud simulation module in our retrieval algorithm LARA (LPMA retrieval Atmospheric Algorithm). The results will be presented here.

  18. 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.

  19. Cryo-Balloon Catheter Localization Based on a Support-Vector-Machine Approach.

    Science.gov (United States)

    Kurzendorfer, Tanja; Mewes, Philip W; Maier, Andreas; Strobel, Norbert; Brost, Alexander

    2016-08-01

    Cryo-balloon catheters have attracted an increasing amount of interest in the medical community as they can reduce patient risk during left atrial pulmonary vein ablation procedures. As cryo-balloon catheters are not equipped with electrodes, they cannot be localized automatically by electro-anatomical mapping systems. As a consequence, X-ray fluoroscopy has remained an important means for guidance during the procedure. Most recently, image guidance methods for fluoroscopy-based procedures have been proposed, but they provide only limited support for cryo-balloon catheters and require significant user interaction. To improve this situation, we propose a novel method for automatic cryo-balloon catheter detection in fluoroscopic images by detecting the cryo-balloon catheter's built-in X-ray marker. Our approach is based on a blob detection algorithm to find possible X-ray marker candidates. Several of these candidates are then excluded using prior knowledge. For the remaining candidates, several catheter specific features are introduced. They are processed using a machine learning approach to arrive at the final X-ray marker position. Our method was evaluated on 75 biplane fluoroscopy images from 40 patients, from two sites, acquired with a biplane angiography system. The method yielded a success rate of 99.0% in plane A and 90.6% in plane B, respectively. The detection achieved an accuracy of 1.00 mm±0.82 mm in plane A and 1.13 mm±0.24 mm in plane B. The localization in 3-D was associated with an average error of 0.36 mm±0.86 mm. PMID:26978663

  20. A statistical approach to pellet stack movement during fuel rod ballooning

    International Nuclear Information System (INIS)

    The principal factor which determines the burst strain of a ballooning PWR fuel rod during a postulated loss-of-coolant accident is the magnitude of the circumferential temperature variation around the Zircaloy cladding. It is currently accepted that heat flux asymmetries associated with pellet eccentricity within the ballooning clad are the main source of such temperature variations. This paper presents an analysis of fuel pellet stack configurational changes which may accompany clad ballooning and consequently influence the development of clad azimuthal temperature gradients. The basis of the model rests on the premise that a stack of fuel pellets whose end-faces are not orthogonal to the cylinder axis but which are constrained within the cladding will develop inter-pellet gaps. During ballooning, closure of the gaps results in a lateral movement of the stack and provides a mechanism by which the central pellets are able to maintain unit eccentricity until the clad has ballooned to a diametral strain at which the inter-pellet gaps are closed. To describe the effect on clad deformation of the pellet-clad configuration changes, a statistical approach to stack movement has been coupled to the TAPSWEL code. It is shown that the distribution of burst strains in the MT-3 rods from the in-pile LOCA simulation test can be predicted using geometric parameters measured on archive pellets. The observed variation of the burst strains exhibited by the MT-3 rods is shown to be reasonably consistent with the model prediction based on the pellet stack displacement concept. (author)

  1. 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

  2. Diet-induced hyperhomocysteinemia exacerbates vascular reverse remodeling of balloon-injured arteries in rat

    Institute of Scientific and Technical Information of China (English)

    GUO Yan-hong; CHEN Feng-ying; WANG Gui-song; CHEN Li; GAO Wei

    2008-01-01

    Background While hyperhomocysteinemia is associated with an increased risk of cardiovascular diseases,the effect of hyperhomocysteinemia on the vascular adventitia and vessel remodeling has not been clearly demonstrated.We investigated the effect of the hyperhomocysteinemia on adventitial hyperplasia and vascular remodeling following balloon injury in rats and the underlying mechanisms.Methods Rats were fed with diet containing methionine for 4 weeks to increase plasma homocysteine before balloon injury.Vascular geometrical changes were assessed at different time points following balloon injury.The collagen deposition was determined by picrosirius red staining and immunohistochemical staining.Results When compared with normal diet group,moderate hyperhomocysteinemia in methionine diet group significantly exacerbated adventitial hyperplasia at clay 7 and collagen deposition mainly in the adventitia at day 28 following balloon injury.The increased plasma homocysteine level significantly increased collagen deposition in the adventitia.There was a negative correlation (r=0.698;P <0.01) between the luminal area and the collagen content in the adventitia on day 28 following balloon injury.In cultured adventitial fibroblasts isolated from rat aorta,100 μmol/L L-homocysteine (L-Hcy) significantly down-regulated matrix metalloproteinase-2 activity by 43% as determined by in vitro gelatin zymography (P <0.05) and up-regulated the expression of collagen type 1 by 187% (P <0.05) assessed by Western blotting.Conclusions Hyperhomocysteinemia exacerbated vascular constrictive remodeling by accelerated neointima formation and collagen accumulation in the adventitia.Increased collagen deposition may be the underlying mechanism.

  3. Balloon laryngoplasty for subglottic stenosis caused by orotracheal intubation at a tertiary care pediatric hospital.

    Science.gov (United States)

    Avelino, Melissa Gomes Ameloti; Fernandes, Edson Junior de Melo

    2014-01-01

    Introduction In recent years, there has been a reduction in mortality rates in neonatal intensive care units (NICUs) due to the impact of modern technological advances in the perinatal field. As a consequence, prolonged orotracheal intubation is used more frequently, and there has been an increase in acquired subglottic stenosis (SGS) in children. Subglottic stenosis is a narrowing of the endolarynx and one of the most common causes of stridor and respiratory distress in children. The laryngoplasty balloon has proven effective in dealing with stenosis both as primary and secondary treatments, after open surgery, with the added advantage of being less invasive and not requiring external access. Materials and Methods This study involved children from pediatric intensive care units or NICUs suffering from respiratory distress and who presented an endoscopic diagnosis of Myer and Cotton grade I to III SGS. These patients underwent balloon laryngoplasty with different numbers of interventions depending on the response in each individual case. Results All the patients responded satisfactorily to the balloon laryngoplasty. None required tracheostomy after treatment and all remained asymptomatic even after 6-month follow-up. One patient required just 1 dilation, 4 required 2, 3 underwent the procedure 3 times, and another had 5 dilations. Conclusion The experience presented here is that of balloon laryngoplasty post-orotracheal intubation SGS with very satisfactory results at a tertiary care pediatric hospital. Although the number of patients is limited, our incidence corroborates other studies that demonstrate the efficacy and safety of balloon dilatation in the treatment of SGS.

  4. Balloon Laryngoplasty for Subglottic Stenosis Caused by Orotracheal Intubation at a Tertiary Care Pediatric Hospital

    Directory of Open Access Journals (Sweden)

    Avelino, Melissa Gomes Ameloti

    2014-01-01

    Full Text Available Introduction In recent years, there has been a reduction in mortality rates in neonatal intensive care units (NICUs due to the impact of modern technological advances in the perinatal field. As a consequence, prolonged orotracheal intubation is used more frequently, and there has been an increase in acquired subglottic stenosis (SGS in children. Subglottic stenosis is a narrowing of the endolarynx and one of the most common causes of stridor and respiratory distress in children. The laryngoplasty balloon has proven effective in dealing with stenosis both as primary and secondary treatments, after open surgery, with the added advantage of being less invasive and not requiring external access. Materials and Methods This study involved children from pediatric intensive care units or NICUs suffering from respiratory distress and who presented an endoscopic diagnosis of Myer and Cotton grade I to III SGS. These patients underwent balloon laryngoplasty with different numbers of interventions depending on the response in each individual case. Results All the patients responded satisfactorily to the balloon laryngoplasty. None required tracheostomy after treatment and all remained asymptomatic even after 6-month follow-up. One patient required just 1 dilation, 4 required 2, 3 underwent the procedure 3 times, and another had 5 dilations. Conclusion The experience presented here is that of balloon laryngoplasty post–orotracheal intubation SGS with very satisfactory results at a tertiary care pediatric hospital. Although the number of patients is limited, our incidence corroborates other studies that demonstrate the efficacy and safety of balloon dilatation in the treatment of SGS.

  5. 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.

  6. Externalization of a stiff guide wire via the radial artery: a new technique to facilitate advancement of an Inoue balloon across the aortic valve in patients with aortic stenosis undergoing antegrade balloon aortic valvuloplasty.

    Science.gov (United States)

    Kato, Hiroshi; Kubota, Shoichi; Goto, Takuya; Haba, Toshihiro; Yamamoto, Makoto

    2016-04-01

    An 84-year-old woman with aortic stenosis underwent antegrade balloon aortic valvuloplasty (BAV). After transseptal puncture, we introduced a 7-Fr wedge catheter into the left ventricle and across the aortic valve. We then inserted a 0.032-inch soft guide wire, and the tip of the guide wire was advanced into the brachial artery and exchanged for a stiff guide wire. We externalized the tip of the stiff guide wire from the radial artery. Finally, we advanced an Inoue balloon (Toray, Tokyo, Japan) across the aortic valve and inflated the balloon. Transradial externalization makes antegrade BAV an even less invasive procedure. PMID:25862651

  7. Flow Past an Accumulator Unit of an Underwater Energy Storage System:Three Touching Balloons in a Floral Configuration

    Institute of Scientific and Technical Information of China (English)

    Ahmadreza Vasel-Be-Hagh; Rupp Carriveau; David S-K Ting

    2014-01-01

    An LES simulation of flow over an accumulator unit of an underwater compressed air energy storage facility was conducted. The accumulator unit consists of three touching underwater balloons arranged in a floral configuration. The structure of the flow was examined via three dimensional iso surfaces of the Q criterion. Vortical cores were observed on the leeward surface of the balloons. The swirling tube flows generated by these vortical cores were depicted through three dimensional path lines. The flow dynamics were visualized via time series snapshots of two dimensional vorticity contours perpendicular to the flow direction;revealing the turbulent swinging motions of the aforementioned shedding-swirling tube flows. The time history of the hydrodynamic loading was presented in terms of lift and drag coefficients. Drag coefficient of each individual balloon in the floral configuration was smaller than that of a single balloon. It was found that the total drag coefficient of the floral unit of three touching balloons, i.e. summation of the drag coefficients of the balloons, is not too much larger than that of a single balloon whereas it provides three times the storage capacity. In addition to its practical significance in designing appropriate foundation and supports, the instantaneous hydrodynamic loading was used to determine the frequency of the turbulent swirling-swinging motions of the shedding vortex tubes;the Strouhal number was found to be larger than that of a single sphere at the same Reynolds number.

  8. Predictable pollution: an assessment of weather balloons and associated impacts on the marine environment--an example for the Great Barrier Reef, Australia.

    Science.gov (United States)

    O'Shea, Owen R; Hamann, Mark; Smith, Walter; Taylor, Heidi

    2014-02-15

    Efforts to curb pollution in the marine environment are covered by national and international legislation, yet weather balloons are released into the environment with no salvage agenda. Here, we assess impacts associated with weather balloons in the Great Barrier Reef World Heritage Area (GBRWHA). We use modeling to assess the probability of ocean endpoints for released weather balloons and predict pathways post-release. In addition, we use 21 months of data from beach cleanup events to validate our results and assess the abundance and frequency of weather balloon fragments in the GBRWHA. We found between 65% and 70% of balloons land in the ocean and ocean currents largely determine final endpoints. Beach cleanup data revealed 2460 weather balloon fragments were recovered from 24 sites within the GBRWHA. This is the first attempt to quantify this problem and these data will add support to a much-needed mitigation strategy for weather balloon waste.

  9. Estudo prospectivo e comparativo do escovado obtido pela CPER à ecoendoscopia associada à punção aspirativa com agulha fina (EE-PAAF no diagnóstico diferencial das estenoses biliares Prospective comparative study of ERCP brush cytology and EUS-FNA for the diferential diagnosis of biliary strictures

    Directory of Open Access Journals (Sweden)

    Monica Novis

    2010-06-01

    Full Text Available OBJETIVO: Avaliar o desempenho diagnóstico da citologia obtida pela CPER, aquele obtido pela EE-PAAF e a concordância entre patologistas gerais (PG e especialistas (PE em pacientes com estenose biliar. MÉTODOS: Incluímos pacientes com estenose biliar identificados pela CPER. A EE-PAAF foi realizada apenas em áreas com efeito de massa ou da parede espessada do ducto biliar. O padrão-ouro foi a cirurgia, histologia e/ou o seguimento. As amostras teciduais foram consideradas: malignas, suspeitas, atípicas, insuficientes ou benignas. Os espécimes obtidos por cada método foi interpretado (cego por um PG e outro PE. RESULTADO: 46 pacientes foram incluídos (37 malignos e 9 benignos. O diagnóstico final foi de tumor pancreático (26, biliar (11, pancreatite crônica (8 e estenose inflamatória do ducto biliar (1. Sensibilidade e acurácia da CPER foram 43,2% e 52,2% para o PG e 51,4% e 58,7% para o PE. Sensibilidade e acurácia da EE-PAAF foi 52,8% e 58,5% para o PG e 69,4% e 73,2% para o PE. A combinação entre a CPER e EE-PAAF demonstrou maior sensibilidade e acurácia para ambos PG (64,9% e 69,6% e PE (83,8% e 84,8%, respectivamente. CONCLUSÃO: A citologia obtida pelo escovado da via biliar durante a CPER e as amostras teciduais colhidas pela EE-PAAF tem rendimento semelhante para o diagnóstico das estenoses biliares. No entanto, a combinação dos métodos resulta em uma maior acurácia. Além disso, espera-se que a interpretação das amostras ocorra com maior precisão pelo PE se comparado ao PG.OBJECTIVE: To evaluate and to compare the diagnostic yield of ERCP brush cytology (ERCP and EUS-FNA in patients with biliary strictures and evaluates the agreement between general pathologists (GP and expert GI pathologists (GIP in the final diagnosis of biliary strictures. METHODS: Patients with biliary strictures documented by ERCP were included. Brush cytology was performed and during EUS, only visible mass lesions or localized bile duct

  10. Balloon-borne stratospheric BrO measurements: comparison with Envisat/SCIAMACHY BrO limb profiles

    Directory of Open Access Journals (Sweden)

    M. Dorf

    2006-01-01

    Full Text Available For the first time, results of four stratospheric BrO profiling instruments, are presented and compared with reference to the SLIMCAT 3-dimensional chemical transport model (3-D CTM. Model calculations are used to infer a BrO profile validation set, measured by 3 different balloon sensors, for the new Envisat/SCIAMACHY (ENVIronment SATellite/SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY satellite instrument. The balloon observations include (a balloon-borne in situ resonance fluorescence detection of BrO (Triple, (b balloon-borne solar occultation DOAS measurements (Differential Optical Absorption Spectroscopy of BrO in the UV, and (c BrO profiling from the solar occultation SAOZ (Systeme d'Analyse par Observation Zenithale balloon instrument. Since stratospheric BrO is subject to considerable diurnal variation and none of the measurements are performed close enough in time and space for a direct comparison, all balloon observations are considered with reference to outputs from the 3-D CTM. The referencing is performed by forward and backward air mass trajectory calculations to match the balloon with the satellite observations. The diurnal variation of BrO is considered by 1-D photochemical model calculation along the trajectories. The 1-D photochemical model is initialised with output data of the 3-D model with additional constraints on the vertical transport, the total amount and photochemistry of stratospheric bromine as given by the various balloon observations. Total [Bry]=(20.1±2.5 pptv obtained from DOAS BrO observations at mid-latitudes in 2003, serves as an upper limit of the comparison. Most of the balloon observations agree with the photochemical model predictions within their given error estimates. First retrieval exercises of BrO limb profiling from the SCIAMACHY satellite instrument on average agree to around 20% with the photochemically-corrected balloon observations of the remote sensing instruments (SAOZ

  11. Preliminary study on a single balloon cross-midlineexpansion via unipedicular approach in kyphoplasty

    Institute of Scientific and Technical Information of China (English)

    SUN Gang; JIN Peng; LI Fan-dong; LIU Xun-wei; HAO Run-song; YI Yu-hai; XIE Zhi-yong

    2008-01-01

    Background Recently, bilateral transpedicular kyphoplasty with a single balloon was performed for osteoporotic vertebral body compression fractures (OVCFs) to reduce the fees of the operation, but the time of operation and radiation exposure are longer. The aim of this study was to determine the safety and effectiveness of a single balloon cross-midline expansion via unipedicular approach in kyphoplasty for OVCFs.Methods Thirty-six patients with painful OVCFs (61 vertebrae) were enrolled in this research. Unilateral transpedicular puncture was performed under the fluoroscopy monitoring of an oblique angle down the pedicle. A single balloon was introduced through unipedicular approach. The final balloon position was in the midline of the vertebral body with the balloon cross-midline expansion and bone cement filled. Clinical outcomes were determined by comparison of the preoperative and postoperative visual analogue scale (VAS) and Oswestry disability index (ODI). Radiographic assessment included restoration of vertebral height and correction of kyphosis. Follow-up was conducted for 6-12 months (mean 9.2 months).Results Thirty-six consecutive patients with 61 vertebrae were successfully operated on with a mean operation time of 37.4 minutes per vertebra. All patients had dramatic pain relief and functional recovery within 96 hours after the procedure with no surgery or device-related complications. VAS score improved from 7.27±1.02 preoperatively to 2.71±0.75 postoperatively (P <0.01). ODI score was decreased from (71.14±10.94)% preoperatively to (26.56±6.35)% postoperatively. The average loss of anterior body height was (14.33e2.76) mm before procedure and (10.03±1.83) mm after procedure (P <0.01), while the average loss of middle body height was (10.15e2.70) mm before procedure and (5.89±1.83) mm after procedure (P <0.01). The kyphotic deformity was corrected from (23.43±5.00) degree to (16.16±2.77) degree (P <0.01). The pain relief and functional recovery

  12. Role Stratospheric Balloon Magnetic Surveys in Development of Analytical Global Models of the Geomagnetic Field

    Science.gov (United States)

    Brekhov, O. M.; Tsvetkov, Yu. P.; Ivanov, V. V.; Filippov, S. V.; Tsvetkova, N. M.

    2015-09-01

    The results of stratospheric balloon gradient geomagnetic surveys at an altitude of ‘-~3O km with the use of the long (6 km) measuring base oriented along the vertical line are considered. The purposes of these surveys are the study of the magnetic field formed by deep sources, and the estimation of errors in modern analytical models of the geomagnetic field. The independent method of determination of errors in global analytical models of the normal magnetic field of the Earth (MFE) is substantiated. The new technique of identification of magnetic anomalies from surveys on long routes is considered. The analysis of gradient magnetic surveys on board the balloon, revealed the previously unknown features of the geomagnetic field. Using the balloon data, the EMM/720 model of the geomagnetic field (http://www.ngdc.noaa.gov/geomag/EMM) is investigated, and it is shown that this model unsatisfactorily represents the anomalous MFE, at least, at an altitude of 30 km, in the area our surveys. The unsatisfactory quality of aeromagnetic (ground-based) data is also revealed by the method of wavelet analysis of the ground-based and balloon magnetic profiles. It is shown, that the ground-based profiles do not contain inhomogeneities more than 1 30 km in size, whereas the balloon profiles (1000 km in the strike extent) contain inhomogeneities up to 600 km in size an the location of the latte coincides with the location of the satellite magnetic anomaly. On the basis of balloon data is shown, it that low-altitude aeromagnetic surveys, due to fundamental reasons, incorrectly reproduce the magnetic field of deep sources. This prevents the reliable conversion of ground-based magnetic anomalies upward from the surface of the Earth. It is shown, that an adequate global model of magnetic anomalies in the circumterrestrial space, developed up to 720 spherical harmonics, must be constructed only in accordance with the data obtained at satellite and stratospheric altitudes. Such a model

  13. Transarterial embolization of massive gastric ulcer bleeding in gastrostomy patients caused by a balloon replacement tube: a case report

    Energy Technology Data Exchange (ETDEWEB)

    Youn, Byong Jong; Hur, Jin; Lee, Kwang Hun; Won, Jong Yun [Yonsei University College of Medicine, Seoul (Korea, Republic of)

    2007-02-15

    We present the case of a 77-year-old woman with massive gastric ulcer bleeding caused by a balloon replacement tube that required emergent transcatheter left gastric arterial embolization in stop the ulcer bleeding.

  14. Efficacy and satisfaction rate comparing endometrial ablation by rollerball electrocoagulation to uterine balloon thermal ablation in a randomised controlled trial.

    NARCIS (Netherlands)

    Zon-Rabelink, I.A.A. van; Vleugels, M.P.; Merkus, J.M.W.M.; Graaf, R.M. de

    2004-01-01

    OBJECTIVE: To compare two methods of endometrial ablation, hysteroscopic rollerball electrocoagulation (RBE) and non-hysteroscopic uterine balloon thermal ablation (Thermachoice trade mark ), regarding efficacy for reducing dysfunctional uterine bleeding and patients satisfaction rate. METHODS: A ra

  15. Strong ''Quantum'' Chaos in the Global Ballooning Mode Spectrum of Three-dimensional Plasmas

    Energy Technology Data Exchange (ETDEWEB)

    R. L. Dewar; P. Cuthbert; R. Ball

    2000-11-29

    The spectrum of ideal magnetohydrodynamic (MHD) pressure-driven (ballooning) modes in strongly nonaxisymmetric toroidal systems is difficult to analyze numerically owing to the singular nature of ideal MHD caused by lack of an inherent scale length. In this paper, ideal MHD is regularized by using a k-space cutoff, making the ray tracing for the WKB ballooning formalism a chaotic Hamiltonian billiard problem. The minimum width of the toroidal Fourier spectrum needed for resolving toroidally localized ballooning modes with a global eigenvalue code is estimated from the Weyl formula. This phase-space-volume estimation method is applied to ballooning-unstable plasma equilibria in the H-1NF helical axis stellarator and the Large Helical Device (LHD).

  16. Framing alters risk-taking behavior on a modified Balloon Analogue Risk Task (BART) in a sex-specific manner.

    Science.gov (United States)

    Gabriel, Kara I; Williamson, Ashley

    2010-12-01

    Framing uncertain scenarios to emphasize potential positive or negative elements influences decision making and behavior. The current experiment investigated sex differences in framing effects on risk-taking propensity in a modified version of the Balloon Analogue Risk Task (BART). Male and female undergraduates completed questionnaires on sensation seeking, impulsiveness, and risk and benefit perception prior to viewing one of three framing conditions for the BART: (1) positively-framed instructions emphasizing the ability to earn money if balloons were inflated to large size; (2) negatively framed instructions emphasizing the possibility that money could be lost if balloons were inflated to bursting; and (3) completely framed instructions noting both possible outcomes. Results revealed correlations between BART performance and impulsiveness for both sexes. Compared to positive and complete framing, negatively framed instructions decreased balloon inflation time in women but not men, indicating sex differences in response to treatments designed to alter risk-taking behavior. PMID:21323127

  17. Low-Weight, Durable, and Low-Cost Metal Rubber Sensor System for Ultra Long Duration Scientific Balloons Project

    Data.gov (United States)

    National Aeronautics and Space Administration — NanoSonic proposes to develop an innovative, low-cost, ultra low mass density, and non-intrusive sensor system for ultra long duration balloons (ULDB) that will...

  18. Determination of plasticizers included in balloon by solid phase microextraction and gas chromatography with mass spectrometric detection.

    Energy Technology Data Exchange (ETDEWEB)

    Park, H.M.; Kim, J.H.; Ryu, J.Ch.; Kim, Y.M.; Lee, K.B. [Korea Institute of Science and Technology, Seoul (Korea)

    2001-02-01

    Solid-phase microextraction (SPME) with 85 {mu}m polyacrylate fiber, coupled to gas chromatography-mass spectrometry was used to analyze the plasticizers contained in balloon samples. The balloons were identified to be made of polyisoprene by IR spectroscopy. The plasticizers extracted from the balloon samples soaked in acetone-added water solvent for an hour were quantified by external standard method using nine kinds of plasticizers. The quantification method was validated for standard plasticizers in the range of 0.25-25 {mu}g/g. The detection limits were 0.11-0.38 {mu}g/g for different plasticizers. The RSDs for the reproducibility of this quantitation method were 3.7-14.2%. A few of balloons included risky level of plasticizer concerned as an endocrine disrupter, and it is necessary to regulate these products. (author). 10 refs., 3 tabs., 4 figs.

  19. Conditions for the validity of the incompressible assumption for the ballooning instability in the long-thin magnetospheric equilibrium

    OpenAIRE

    Miura, Akira

    2000-01-01

    Conditions under which the compressibility can be neglected for the magnetospheric ballooning instability, which arises in the shear Alfvén branch, are clarified in the context of ideal magnetohydrodynamic plasmas and stochastic plasmas by using the normal mode analysis and the energy principle. An expansion in the small parameter, which is equal to the ratio of the ∇⊥ B 0 scale length to the field line curvature radius, shows that the incompressible assumption is valid for the ballooning ins...

  20. Apical ballooning syndrome complicated by acute severe mitral regurgitation with left ventricular outflow obstruction – Case report

    OpenAIRE

    Celermajer David S; Chandrasegaram Manju D; Wilson Michael K

    2007-01-01

    Abstract Background Apical ballooning syndrome (or Takotsubo cardiomyopathy) is a syndrome of transient left ventricular apical ballooning. Although first described in Japanese patients, it is now well reported in the Caucasian population. The syndrome mimicks an acute myocardial infarction but is characterised by the absence of obstructive coronary disease. We describe a serious and poorly understood complication of Takotsubo cardiomyopathy. Case Presentation We present the case of a 65 year...