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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"lithotripsy"”.
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Acoustic sensing of renal stone fragmentation in extracorporeal shockwave lithotripsy
… detected during extracorporeal shockwave lithotripsy (a non-invasive procedure for the treatment of urinary stones) to develop a new diagnostic system. The work formed part of a research project on lithotripsy undertaken by the University of Southampton in collaboration with Guy's and St …
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Deep Photoacoustic Imaging and Acoustic Cavitation Mapping in Shockwave Lithotripsy
… is a major health problem worldwide. Shockwave lithotripsy (SWL), which uses high-energy shockwave pulses to break up kidney stones, is extensively used in clinic. However, SWL can produce cavitation in vivo, and the rapid expansion and violent collapse of cavitation bubbles in small blood …
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A study of stone fragmentation in shock wave lithotripsy by customizing the acoustic field and waveform shape
Shock wave lithotripsy is the preferred treatment modality for kidney stones in the United States. Despite clinical use for over twenty-five years, the mechanisms of stone fragmentation are still under debate. A piezoelectric array was employed to examine the effect of waveform shape and pressure …
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The comparative study of effectiveness and risk factors of ureteroscopy and extracorporeal shock wave lithotripsy in the upper part of ureter /
… effect. of ureteroscopy and extracorporeal lithotripsy when the stone is being removed from the upper part of the ureter. Till now, in Lithuania no study have analysed ureteroscopic stone removal results only from the upper part of the ureter. In the researches that have been made up to date …
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Ureteroskopijos ir ekstrkorporinės litotripsijos efektyvumo bei rizikos veiksnių palyginimasis tyrimas šalinant akmenis iš viršutinio šlapimtakio trečdalio /
… effectiveness of ureteroscopy and extracorporeal lithotripsy application. The study results showed that comparing with extracorporeal lithotripsy, ureteroscopy with a laser lithotripsy is a more effective and quicker treatment method when seeking to reach a stone free rate in the upper part of the …
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Endoscopic large-balloon dilation alone versus endoscopic sphincterotomy plus large-balloon dilation for the treatment of large bile duct stones
… LBD alone (n = 62) or EST plus LBD (n = 69) for lithotripsy. The therapeutic outcome and complications were reviewed and compared. There were no differences between the two groups with regard to age, size and number of stones, or bile duct diameter. The LBD alone group (mean age, 70.4 years) and …
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Factors affecting recurrence of intrahepatic duct stone and factors affecting development of cholangiocarcinoma after initial treatment of intrahepatic duct stone
… Percutaneous transhepatic choledochoscopic stone lithotripsy (PTCS)and surgery were performed in 112 cases and in 34 cases, respectively. Peroral transpapillary endoscopic lithotripsy was also used in 3 patients and 10 patients were followed up without any treatment because of their comorbidities. …
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Adaptable Design Improvements For Electromagnetic Shock Wave Lithotripters And Techniques For Controlling Cavitation
… mechanistic understanding of how shock wave lithotripsy (SWL) breaks stones in order to guide design improvements to a modern electromagnetic (EM) shock wave lithotripter. To accomplish this goal, experimental studies were carefully designed to isolate mechanisms of fragmentation, and models …
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Single sitting endourological management of retained ureteral stents at Groote Schuur Hospital: A 3-year retrospective study
… (n= 14) patients received ureteroscopy and laser lithotripsy. The most common FECAL classification was IV at 59% (n= 17). The most common side affected by stent encrustation was the right (55.56%). Conclusion: The endoscopic combined approached is safe and feasible technique that allows removal of …
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Do balloons larger than 15 mm in size increase the risk of adverse events in endoscopic large balloon dilation?
… and minimize the need for endoscopic mechanical lithotripsy (EML). Much recent literature has suggested EPLBD is safe and effective for extraction of large or difficult stones without any additional risk of lifethreatening pancreatitis or perforation. Nevertheless, limited data exist on the …
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An experimental study on the collapse of an air-filled cylindrical cavity under dynamic loading
… in biomedical applications such as shockwave lithotripsy. No-boundary, rigid boundary, and two-boundary cases were also investigated. A transient pressure wave of 20~MPa peak magnitude generated by projectile impact was used to initiate bubble collapse. Ultra high-speed video recordings of the …
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Materials At Extremes: Shock-induced Fracture and Phase Transitions
… shock waves in medical practices, such as shock lithotripsy used to break up kidney stones, in the high throughput testing of novel materials, and in the generation of exotic states of matter. Expanding on previous experimental developments, the work presented herein employs laser-induced …
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Numerical Methods for Fluid-Solid Coupled Simulations: Robin Interface Conditions and Shock-Dominated Applications
… experiments in the context of shock wave lithotripsy. Then, a parametric study is conducted to elucidate the significant effects of the shock wave's profile on material damage. In the second study, the computational framework is applied to simulate shock-induced bubble collapse near …
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Domain wall dynamics and neuronic crackling noise
… and measurement of stone responses to different lithotripsy strategies, will assist in optimisation of settings of the laser and other lithotripsy devices to incite fragmentation by targeting the "wild" avalanche regime.
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A Computational Framework for Fracture Modeling in Coupled Field Problems
… simulation of kidney stones during shock wave lithotripsy (SWL), an acoustic-solid-fracture coupling problem. The present study develops a novel computational framework for simulating SWL. </p><p>The propagation of acoustic pressure is modeled by a wave equation and the deformation of the …
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Mitigation of intrarenal pressure in retrograde intrarenal surgery with a novel isoprenaline eluting guidewire
… enhanced stone-free rates relative to shockwave lithotripsy and reduced patient morbidity compared to percutaneous nephrolithotomy, it is not devoid of problems, many of which are associated with intrarenal pressure (IRP). To alleviate the challenges associated with increased IRP, surgeons may …
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ESWL-Derived Particle Size Distribution and Fracture Geometries: A Contextual GeoBioMed Framework for Assessment of Kidney Stone Recurrence
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-14 without embargo terms
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Detailed simulations of bubble-cluster dynamics
The violent collapse of bubble clusters can be an important mechanism of damage to adjacent material surfaces in both engineering and biomedical applications. Because of their complexity, past theoretical studies have generally been restricted to significantly simplified models, such as homogenized …