Measurement of Shock Wave Pressures Used for Lithotripsy

Hunter, Patrick T.; Finlayson, Birdwell; Hirko, Robert J.; Voreck, Wallace C.; Walker, R R; Walck, Scott D.; Nasr, Mohammed

doi:10.1016/s0022-5347(17)45038-5

Cited by 74 publications

(9 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8 In vitro study of the effects of SWL in the dog kidney have shown capillary rupture and resulting tissue hypoxia, 10 with similar results in a porcine model revealing extensive hemorrhage and vascular rupture both in the targeted kidney and outside the focus field. 11 In rat kidneys prepared with casting material, SWL caused arterial injury, ranging from complete arcuate occlusion to small afferent arteriolar and glomerular capillary extravasation.…”

Section: Experimental Evidencementioning

confidence: 75%

“…7 The maximal energy generated by SWL is focused at a point defined as F2, but surrounding structures will also be subjected to energy from the shockwave. Estimation of the effective high pressure volume of the F2 point, however, is approximately 1.5 cc; outside this area, there is a rapid decrease to 20% of that at the focal point, 8 but pressure changes that extend beyond the F2 point up to 12 cm away have been recorded. 9 There is concern that energy outside the F2 point may cause injury to intra-abdominal organs and to the vascular tree, particularly in areas of calcification of an atherosclerotic plaque.…”

Section: Experimental Evidencementioning

confidence: 94%

See 1 more Smart Citation

Shockwave Lithotripsy: Arterial Aneurysms and Vascular Complications

Tse

Qazi

Halsall

et al. 2011

Journal of Endourology

View full text Add to dashboard Cite

There is currently no high-level evidence to suggest that SWL in the presence of arterial aneurysm is unsafe. Experimental work on ex vivo human tissue does not suggest that SWL is causative to aneurysm rupture. With the availability of CT imaging in modern clinical practice, aneurysms of the arterial tree should be identified as part of the investigation of urinary tract calculi. SWL can be safely performed in patients with AAA, but monitoring postprocedure is mandatory, along with access to emergency vascular surgery support; importantly, any onset of new pain or symptoms should be aggressively investigated by radiologic imaging in the first instance.

show abstract

Section: Experimental Evidencementioning

confidence: 75%

Section: Experimental Evidencementioning

confidence: 94%

Shockwave Lithotripsy: Arterial Aneurysms and Vascular Complications

Tse

Qazi

Halsall

et al. 2011

Journal of Endourology

View full text Add to dashboard Cite

show abstract

“…Church (1989) reported that the ratio of peak positive pressure to peak negative pressure, which were measured by conventional pressure transducers, can be about 6.3. Hunter et al (1986) and Nasr (1986) showed this ratio to be about 3.1. However, the negative pressure of water should not be below 100kPa.…”

Section: ]Introductionmentioning

confidence: 91%

“…Crum (1988) discussed contribution of cavitation to the disintegration of human calculi and" pointed out significance of the impact pressure of a high speed liquid microjet which were induced at the moment of cavitation bubble collapse. Furthermore, Hunter et al (1986) showed that the stone fragmentation was promoted even by cavitation bubble collapse. On the other hand, tissue damage associated with the ESWL was well recognized to induce an undesirable complication.…”

Section: ]Introductionmentioning

confidence: 99%

Cavitation phenomena in extracorporeal microexplosion lithotripsy

et al. 1994

View full text Add to dashboard Cite

Abstract. An experimental investigation was made of cavitation phenomena induced by underwater shock wave focusing applied to the extracorporeal microexplosion lithotripsy (microexplosion ESWL). Firstly an underwater microexplosion generated by detonation of a 10mg silver azide pellet was studied and secondly underwater shock focusing and its induced cavitation phenomena were investgated. Underwater shock wave was focused by using a semi-ellipsoidal reflector in which a shock wave generated at the first focal point of the reflector was reflected and focused at the second focal point. It is found that an explosion product gas bubble did not produce any distinct rebound shocks. Meantime cavitation appeared after shock focusing at the second focal point where expansion waves originated at the exit of the reflector were simultaneously collected. A shock/bubble interaction is found to contribute not only to urinary tract stone disintegration but also tissue damage. The cavitation effect associated with the microexplosion ESWL was weaker in comparison with a spark discharge ESWL. The microexplosion ESWL is an effective method which can minimize the number of shock exposures hence decreasing tissue damage by conducting precise positioning of urinary tract stones.

show abstract

“…These latter transducers, although robust, have resonant frequencies less than 1 MHz and element dimensions of several millimeters [163]- [164].…”

Section: A Hydrophone Measurementmentioning

confidence: 99%

The impact of piezoelectric PVDF on medical ultrasound exposure measurements, standards, and regulations

Harris

Preston

DeReggi

2000

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

View full text Add to dashboard Cite

This paper describes the development of PVDF hydrophones for characterizing medical ultrasound fields. The polymer hydrophone approaches that have resulted from this work are discussed, with emphasis given to the spot-poled membrane design that has become the de facto reference device for these measurements. The various national and international standards and regulations that have followed from the successful use of PVDF hydrophones also are summarized. The works discussed encompass polymer-based hydrophones designed primarily for diagnostic and lithotripsy exposure measurements, both in water and in vivo. The advent of these hydrophones has made possible accurate and reliable measurements of exposure levels encountered in medical ultrasound and, thus, has allowed questions of ultrasound bioeffects and device safety to be addressed in a consistent and scientifically sound manner.

show abstract

Measurement of Shock Wave Pressures Used for Lithotripsy

Cited by 74 publications

References 11 publications

Shockwave Lithotripsy: Arterial Aneurysms and Vascular Complications

Shockwave Lithotripsy: Arterial Aneurysms and Vascular Complications

Cavitation phenomena in extracorporeal microexplosion lithotripsy

The impact of piezoelectric PVDF on medical ultrasound exposure measurements, standards, and regulations

Contact Info

Product

Resources

About