Laser shock-wave lithotripsy: numerical modeling of destruction process of human calculi

M. V. Lorits; Alexander G. Murzin; Il'ya B. Vitrishchak; Vladimir V. Vorontsov

doi:10.1117/12.229545

10 January 1996 Laser shock-wave lithotripsy: numerical modeling of destruction process of human calculi

M. V. Lorits, Alexander G. Murzin, Il'ya B. Vitrishchak, Vladimir V. Vorontsov

Proceedings Volume 2624, Laser-Tissue Interaction and Tissue Optics; (1996) https://doi.org/10.1117/12.229545
Event: BiOS Europe '95, 1995, Barcelona, Spain

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.

Citation Download Citation

M. V. Lorits, Alexander G. Murzin, Il'ya B. Vitrishchak, and Vladimir V. Vorontsov "Laser shock-wave lithotripsy: numerical modeling of destruction process of human calculi", Proc. SPIE 2624, Laser-Tissue Interaction and Tissue Optics, (10 January 1996); https://doi.org/10.1117/12.229545

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KEYWORDS

Absorption

Calculi

Plasma

Laser therapeutics

Process modeling

Laser lithotripsy

Numerical modeling

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