Transient oscillation of cavitation bubbles near stone surface during electrohydraulic lithotripsy.

Abstract:

:Using high-speed photography and acoustic emission measurements, we studied the dynamics of a transient cavitation bubble near a stone surface and the concomitant shockwaves generated during electrohydraulic lithotripsy (EHL). At each spark discharge, a vapor plasma and subsequently a cavitation bubble oscillating around the tip of an EHL probe are produced. Simultaneously, three distinctive shockwave pulses are generated. The first shockwave is produced by the rapid expansion of the vapor plasma, while the second and third waves are produced by rebounds of the cavitation bubble. Depending on the proximity of the probe to the stone surface, the collapse of the cavitation bubble may be symmetric, resulting in a strong shockwave emission; or asymmetric, leading to the formation of a liquid jet. For the Nortech AUTOLITH lithotripter with a 1.9F probe that was used in this study, maximum shockwave emission is produced when the probe is about 1 mm from the stone surface, whereas the maximum jet velocity is produced when the probe tip is at distance equivalent to the maximum bubble radius of about 3 mm. These findings are consistent with clinical experience, which suggests that for optimal treatment results, the EHL probe should be placed close to the stone surface.

journal_name

J Endourol

journal_title

Journal of endourology

authors

Zhong P,Tong HL,Cocks FH,Preminger GM

doi

10.1089/end.1997.11.55

subject

Has Abstract

pub_date

1997-02-01 00:00:00

pages

55-61

issue

1

eissn

0892-7790

issn

1557-900X

journal_volume

11

pub_type

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