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Proceedings Paper

Fragmentation process during Ho:YAG laser lithotripsy revealed by time-resolved imaging
Author(s): Didier Beghuin; Guy P. Delacretaz; Franz R. Schmidlin; Klaus Rink
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Paper Abstract

The stone fragmentation process induced during Ho:YAG laser lithotripsy was observed by time-resolved flash video imaging. Possible acoustic transient occurrence was simultaneously monitored with a PVDF needle hydrophone. We used artificial and cystine kidney stones. We observed that, although the fragmentation process is accompanied with the formation of a cavitation bubble, cavitation has a minimal incidence on stone fragmentation. Fragment ejection is mainly due to a direct laser stone heating and vaporization of stone organic constituents and interstitial water. The minimal effect of the cavitation bubble for fragmentation is confirmed by acoustic transients measurements, which reveal weak pressure transients. This is in contrast with the fragmentation mechanisms induced by laser of shorter pulse duration.

Paper Details

Date Published: 14 January 1998
PDF: 5 pages
Proc. SPIE 3195, Laser-Tissue Interaction, Tissue Optics, and Laser Welding III, (14 January 1998); doi: 10.1117/12.297905
Show Author Affiliations
Didier Beghuin, Ecole Polytechnique de Lausanne (Switzerland)
Guy P. Delacretaz, Ecole Polytechnique de Lausanne (Switzerland)
Franz R. Schmidlin, Hopital cantonal de Geneve (Switzerland)
Klaus Rink, Ecole Polytechnique de Lausanne (Switzerland)

Published in SPIE Proceedings Vol. 3195:
Laser-Tissue Interaction, Tissue Optics, and Laser Welding III
Guy P. Delacretaz; Guilhem Godlewski; Roberto Pini; Rudolf W. Steiner; Lars Othar Svaasand, Editor(s)

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