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

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Zhong, P; Tong, HL; Cocks, FH; Preminger, GM

Published Date

  • February 1997

Published In

Volume / Issue

  • 11 / 1

Start / End Page

  • 55 - 61

PubMed ID

  • 9048300

International Standard Serial Number (ISSN)

  • 0892-7790

Digital Object Identifier (DOI)

  • 10.1089/end.1997.11.55

Language

  • eng

Conference Location

  • United States