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Proceedings Paper

Laser shock-wave lithotripsy: numerical modeling of destruction process of human calculi
Author(s): M. V. Lorits; Alexander G. Murzin; Il'ya B. Vitrishchak; Vladimir V. Vorontsov
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Paper Abstract

The model of human calculi fragmentation process by laser radiation is proposed. It is shown, that under the conditions typical for laser lithotripsy, plasma can not be considered as the effective transformer of laser radiation energy into shock waves. It is considered that the human calculi has a multi-layer structure. In this structure the organic layers are separated by layers of nonorganic matter. Organic matter is supposed to have high absorption, while nonorganic matter--low absorption and high scattering. The basic geometry is presented. It was shown that the ablation process can be treated as consisting of three phases. The first stage is the pure heating of organic matter. The second one is the decomposition of organic matter leading to gas and pyrocarbon formation. Due to this process the absorption coefficient of laser radiation increases dramatically, and this leads to the sharp temperature growth, so (third stage) the conditions for plasma flash can be reached.

Paper Details

Date Published: 10 January 1996
PDF: 5 pages
Proc. SPIE 2624, Laser-Tissue Interaction and Tissue Optics, (10 January 1996); doi: 10.1117/12.229545
Show Author Affiliations
M. V. Lorits, S.I. Vavilov State Optical Institute (Russia)
Alexander G. Murzin, S.I. Vavilov State Optical Institute (Russia)
Il'ya B. Vitrishchak, S.I. Vavilov State Optical Institute (Russia)
Vladimir V. Vorontsov, S.I. Vavilov State Optical Institute (Russia)


Published in SPIE Proceedings Vol. 2624:
Laser-Tissue Interaction and Tissue Optics
Guy P. Delacretaz; Rudolf W. Steiner; Lars Othar Svaasand; Hansjoerg Albrecht; Thomas H. Meier, Editor(s)

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