fragmentation of kidney stone

Numerical Analysis of Kidney Stone Fragmentation by …

Numerical Analysis of Kidney Stone Fragmentation by Short Pulse Impingement: Effect of Geometry p.1283 Real-Time and Full-Field Deflection Measurement of Thin Films Electroplated on the Single Crystal Silicon Wafers

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Fragmentation of Kidney Stone by Shock Wave …

To understand fundamentals of kidney stone™s fragmentation by shock wave impingement, experimental approach was carried out. Air gun system was used to transfer a well-controlled stress wave into a thin disk specimen. The specimen was fabricated with plaster and its dimensions are 10 mm in diameter and 1.2 mm in thickness.

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Complete Kidney Stone fragmentation by ESWL | …

2019-9-8 · Benefit of Kidney stone fragmentation by ESWL: The main advantage of this treatment is that many patients may be treated for kidney stones without surgery. As a result, complications, hospital stays, costs and recovery time are reduced. What is the advantage of ESWL as compared to other stone …

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Finite element simulations of kidney stones …

This paper analyses the fragmentation of kidney stones by direct impact with Swiss Lithoclast Master(R). Based on a previous work, the impact of the probe of the Lithoclast is modeled with a displacement control of the nodes inside the impacted area. Different computations are carried out focusing the efforts on new tentative designs of the cross section of the probe, as well as the influence ...

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Numerical Analysis of Kidney Stone Fragmentation by …

To better understand the behavior of stresses generated inside a kidney stone by direct pulse impingement during extracorporeal shock wave lithotripsy (ESWL), numerical analyses are performed in this work. LS-DYNA, an explicit Finite Element code for non-linear dynamic analysis is employed to investigate the effect of stone geometry to the stress field evolution inside the stone when subjected ...

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Features of gallstone and kidney stone fragmentation …

 · Laser lithotripsy is nowadays a method widely used for fragmentation of gallstones, urinary calculus and kidney stones. Flashlamp pumped dye lasers of microsecond duration are most often used for such purposes.

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Fragmentation Mechanisms of Kidney Stones in Shock …

2014-5-10 · kidney stones in vitro using micro-computed tomography," J. Acoust. Soc. Am., 110: 1733-1736 (2001). [3] JA McAteer, RO Cleveland, RF Paterson, DL Rietjens, AP Evan, BA Connors, JE Lingeman, JC Williams Jr, "Evidence that cavitation and spall contribute to stone failure in an animal model of kidney stone fragmentation by shock

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Features of gallstone and kidney stone fragmentation …

It is shown that infra-red ((lambda) equals 1064 nm) long pulse (approximately 100 microsecond(s) ) radiation of YAG:Nd laser, operating in free generation regime, effectively fragments gallstones, urinary calculus and kidney stones. The features of the mechanism of this process are investigated. Laser lithotripsy is nowadays a method widely used for fragmentation of gallstones, urinary ...

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Rigid and flexible ureteroscopy and stone fragmentation ...

Rigid and flexible ureteroscopy and stone fragmentation: information for patients What does the procedure involve? Removal/fragmentation of stone(s) in the ureter or kidney using a rigid or flexible telescope. It may be combined with placement of a soft plastic tube or stent between the kidney and the bladder. This procedure

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METHOD AND APPARATUS TO DETECT THE …

The invention in which an exclusive right is claimed is defined by the following: 1. A method for detecting the fragmentation of a kidney stone during shock wave therapy, the method comprising the steps of: (a) detecting a resonant acoustic scattering wave to generate a resonant acoustic scattering signal during therapy, the resonant acoustic scattering signal being indicative of internal ...

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The mechanisms of stone fragmentation in ESWL

The mechanisms of stone fragmentation in ESWL - ScienceDirect

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Three-dimensional fracture and fragmentation of artificial ...

in the research of the mechanisms of fracture and fragmentation. The Ultracal-30 gypsum is adopted as a model for a stone, as it is suitable for lithotripsy studies in vitro, acute animal experiments in which the stones are implanted in the kidney, and as a target to compare …

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Fragmentation and dusting of large kidney stones …

 · Fragmentation and dusting of large kidney stones using compact, air-cooled, high peak power, 1940-nm, Thulium fiber laser

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Three-dimensional fracture and fragmentation of artificial ...

kidney stones. Lithotripsy is the technique of applying pressure pulses to the exterior of the body to induce high stresses in renal calculi. A lithotripter is a machine which is used to generate and apply these pressure waves. The waves are designed with the purpose to induce stresses that lead to the fracture and fragmentation of the kidney stones.

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Fragmentation of kidney stones in vitro by focused ...

2014-8-26 · Fragmentation of kidney stones in vitro by focused ultrasound bursts without shock waves Adam Maxwell, Bryan Cunitz, Wayne Kreider, Oleg Sapozhnikov, ... Stone comminution achieved in all natural stone types treated at f = 170 kHz, p a = 6.5 MPa 1 cm 1 cm Uric Acid Struvite COM Cystine .

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The mechanisms of stone fragmentation in ESWL

Currently, several mechanisms of kidney stone fragmentation in extracorporal shockwave lithotripsy (ESWL) are under discussion. As a new mechanism, the circumferential quasistatic compression or "squeezing" by evanescent waves in the stone has been introduced. In fragmentation …

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Ureter Stone Treatments

Ureter stones are kidney stones that have been passed to the ureter (a tube that transports urine from the kidneys to the bladder). The choice of treatment for a ureter stone ranges from watchful waiting to surgery and will depend on the stone''s size, as …

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Figure 1 from Detecting Fragmentation of Kidney …

FIGURE 1. Shadowgraphic observation of a lithotripter shock wave scattering from a stone. The images are captured in water with a high-speed camera at different time moments after the shock wave emission. The shadow of the stone (cylindrical shape, 6.5 mm diameter, 8.5 mm length, made from U-30 cement) is seen in the center of the images. Solid arrows show the position of the incident shock ...

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Prediction of fragmentation of kidney stones: A ...

2016-7-12 · The influence of internal stone structure on the fragmentation behaviour of urinary calculi had also been studied by Pittomul et al 22 Similarly, in vitro studies done by Marchinena et al 23 also proved that there was a statistically significant relationship between the attenuation values and fragility.

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Prediction of fragmentation of kidney stones: a ...

2016-7-1 · Free Online Library: Prediction of fragmentation of kidney stones: a statistical approach from NCCT images.(ORIGINAL RESEARCH, Report) by "Canadian Urological Association Journal (CUAJ)"; Health, general Artificial neural networks Kidney stones Care and treatment Research Lithotripsy Health aspects Neural networks

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[PDF] Detecting Fragmentation of Kidney Stones in ...

When a fracture occurs in the stone or the stone becomes smaller, the elastic waves in the stone will propagate differently (e.g. shear waves will not cross a fracture) which, in turn, will change the scattered acoustic wave in the surrounding medium.

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Fragmentation and dusting of large kidney stones …

Previous Thulium fiber laser lithotripsy (TFL) studies were limited to a peak power of 70 W (35 mJ / 500 μs), requiring operation in dusting mode with low pulse energy (35 mJ) and high pulse rate (300 Hz). In this study, a novel, compact, air-cooled, TFL capable of operating at up to 500 W peak power, 50 W average power, and 2000 Hz, was tested. The 1940-nm TFL was used with pulse duration ...

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Detecting Fragmentation of Kidney Stones in …

2006-5-17 · Although extracorporeal shock wave lithotripsy (a procedure of kidney stone comminution using focused shock waves) has been used clinically for many years, a proper monitoring of the stone fragmentation is still undeveloped. A method considered here is based on recording shock wave scattering signals with a focused receiver placed far from the stone, outside the patient body.

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The mechanisms of stone fragmentation in ESWL

2001-5-1 · Currently, several mechanisms of kidney stone fragmentation in extracorporal shockwave lithotripsy (ESWL) are under discussion. As a new mechanism, the circumferential quasistatic compression or "squeezing" by evanescent waves in the stone has been introduced.

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(PDF) Three-dimensional fracture and fragmentation …

The structure of the kidney stone has long been known to be nonhomogeneous (Zhong et al. 1992(Zhong et al., 1993Pittomvils et al. 1994), however, most attempts at simulating such problems have ...

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Fragmentation of kidney stones in vitro by focused ...

Fragmentation of kidney stones in vitro by focused ultrasound bursts without shock waves. ... This work investigated the characteristics of stone fragmentation for natural (uric acid, struvite ...

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KIDNEY STONE TYPES | Kidney Stone Evaluation And …

The calcium oxalate kidney stone comes in two varieties, calcium oxalate monohydrate and calcium oxalate dihydrate. The former are harder and therefore more resistant to fragmentation by lithotripsy. Likewise, the former appear more often when elevated levels of urine oxalate are present. Calcium oxalate stone …

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Finite element simulations of kidney stones …

2010-3-1 · In contrast with the previous approaches, a discrete approach for the fragmentation of the kidney stones is given in. The approach, which is based on the original work presented in, consists in an explicit FE formulation which allows for the automatic tracing of initiation and propagation of multiple cracks in brittle materials.

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URETEROSCOPY AND STONE FRAGMENTATION – …

Telescopic removal/ fragmentation of stone (s) in the ureter or kidney with possible placement of a soft plastic tube or stent between the kidney and the bladder. This procedure also includes cystoscopy (looking inside the bladder with a telescope) and x-ray screening.

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Optimum energy on the fragmentation of kidney …

2011-8-23 · – This paper aims to describe a numerical approach to the fragmentation of kidney stones by direct impact., – The numerical approach consists of a Lagrangian finite element formulation with dynamic insertion of cohesive‐free surfaces. Cohesive free surfaces are governed by a damage constitutive model whereas the continuum part of the mesh remains linear elastic.

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Numerical Analysis of Kidney Stone Fragmentation by …

2005-4-15 · In this work, numerical analyses are performed to study the behavior of stresses generated inside a kidney stone by direct pulse impingement during extracorporeal shock wave lithotripsy (ESWL), which leads to fragmentation of the stone. LS-DYNA, an explicit Finite Element code for non-linear dynamic analysis is employed to model the problems.

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Stone fragmentation by ultrasound | SpringerLink

The presence of kidney stone in the kidney causes discomfort to patients. Hence, removal of such stones is important which is commonly done these days, non-destructively, with lithotripters without surgery. Commercially, lithotripters like extra-corporeal shock wave lithotripters (ESWL) made by Siemens etc are in routine use. These methods are very cumbersome and expensive.

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