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Proceedings Paper

Investigation on the impact of pulse duration for laser induced lithotripsy
Author(s): Ronald Sroka; Tugba Kiris; Sebastian Fiedler; Gabriel Scheib; Julia Kuznetsova; Thomas Pongratz
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Paper Abstract

Objective: In-vitro investigation of Ho:YAG-laser induced stone fragmentation was performed to identify potential impacts of different pulse durations on stone fragmentation characteristics. Materials and Methods: An innovative Ho:YAG laser system (Swiss LaserClast, EMS S.A., Nyon, Switzerland) with selectable long- or short pulse mode was tested with regard to its fragmentation properties. The pulse duration depends on the specific laser parameter used. Fragmentation tests (hand held, hands free, single pulse induced crater) on artificial BEGO-Stones and fiber burn back tests were performed under reproducible experimental conditions. Additionally, the repulsion of long versus short laser pulses was compared using the pendulum set-up. Results: Differences in fragmentation rates between the two pulse duration regimes were seen. The difference was, however, not statistically significant. Using long pulse mode, the fiber burn back is nearly negligible while in short pulse mode an increased burn back was seen. The results of the pendulum test showed that the deviation induced by the momentum of shorter pulses is increased compared to longer pulses. Conclusion: Long pulse-mode showed reduced side effects like repulsion and fiber burn back in comparison to short pulse-mode while fragmentation rates remained at a comparable level. Lower push back and reduced burn back of longer laser pulses may results in better clinical outcome of laser lithotripsy and more convenient handling during clinical use.

Paper Details

Date Published: 4 March 2014
PDF: 5 pages
Proc. SPIE 8926, Photonic Therapeutics and Diagnostics X, 89261G (4 March 2014); doi: 10.1117/12.2037838
Show Author Affiliations
Ronald Sroka, Klinikum der Univ. München (Germany)
Tugba Kiris, Klinikum der Univ. München (Germany)
Sebastian Fiedler, Klinikum der Univ. München (Germany)
Gabriel Scheib, Klinikum der Univ. München (Germany)
Julia Kuznetsova, Klinikum der Univ. München (Germany)
Thomas Pongratz, Klinikum der Univ. München (Germany)

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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