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4 March 2014 Investigation on the impact of pulse duration for laser induced lithotripsy
Ronald Sroka, Tugba Kiris, Sebastian Fiedler, Gabriel Scheib, Julia Kuznetsova, Thomas Pongratz
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Proceedings Volume 8926, Photonic Therapeutics and Diagnostics X; 89261G (2014) https://doi.org/10.1117/12.2037838
Event: SPIE BiOS, 2014, San Francisco, California, United States
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.
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Ronald Sroka, Tugba Kiris, Sebastian Fiedler, Gabriel Scheib, Julia Kuznetsova, and Thomas Pongratz "Investigation on the impact of pulse duration for laser induced lithotripsy", Proc. SPIE 8926, Photonic Therapeutics and Diagnostics X, 89261G (4 March 2014); https://doi.org/10.1117/12.2037838
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KEYWORDS
Pulsed laser operation
Laser therapeutics
Fiber lasers
Laser systems engineering
Holmium
In vitro testing
Laser energy
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