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Proceedings Paper

Visualizing mechanical stress and liquid flow during laser lithotripsy
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Paper Abstract

The mechanism of action of the holmium laser lithotripsy is attributed to explosive expanding and imploding vapor bubbles in association with high-speed water jets creating high mechanical stress and cracking the stone surface. A good understanding of this mechanism will contribute to the improvement and the safety of clinical treatments. A new method has been developed to visualize the dynamics of mechanical effects and fluid flow induced by Holmium laser pulses around the fiber tip and the stone surface. The fiber tip was positioned near the surface of a stone on a slab of polyacrylamide gel submerged in water. The effects were captured with high speed imaging at 2000-10000 f/s. The dynamics of the pressure wave after the pulse could be visualized by observing the optical deformation of a fine line pattern in the background of the water container using digital subtraction software. This imaging technique provides a good understanding of the mechanical effects contributing to the effectiveness and safety of lithotripsy and can be used to study the optimal fiber shape and position towards the stone surface.

Paper Details

Date Published: 4 March 2014
PDF: 8 pages
Proc. SPIE 8926, Photonic Therapeutics and Diagnostics X, 89261K (4 March 2014); doi: 10.1117/12.2039089
Show Author Affiliations
Ilja Reinten, VU Univ. Medical Ctr. (Netherlands)
Rudolf Verdaasdonk, VU Univ. Medical Ctr. (Netherlands)
Albert van der Veen, VU Univ. Medical Ctr. (Netherlands)
John Klaessens, VU Univ. Medical Ctr. (Netherlands)

Published in SPIE Proceedings Vol. 8926:
Photonic Therapeutics and Diagnostics X
Bernard Choi; Hyun Wook Kang; Brian J. F. Wong M.D.; Guillermo J. Tearney M.D.; Andreas Mandelis; Nikiforos Kollias; Kenton W. Gregory M.D.; Justus F. Ilgner M.D.; Haishan Zeng; Laura Marcu, Editor(s)

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