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Proceedings Paper

The study of laser pulse width on efficiency of Ho:YAG laser lithotripsy
Author(s): Jian J. Zhang; Jonathan Rutherford; Metasebya Solomon; Brian Cheng; Jason R. Xuan; Jason Gong; Honggang Yu; Michael Xia; Xirong Yang; Thomas Hasenberg; Sean Curran
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Paper Abstract

When treating ureteral calculi, retropulsion can be reduced by using a longer pulse width without compromising fragmentation efficiency (from the studies by David S. Finley et al. and Hyun Wook Kang et al.). In this study, a lab build Ho:YAG laser was used as the laser pulse source, with pulse energy from 0.2J up to 3.0 J, and electrical pump pulse width from 150 us up to 1000 us. The fiber used in the investigation is a 365 μm core diameter fiber, SureFlexTM, Model S-LLF365. Plaster of Paris calculus phantoms were ablated at different energy levels (0.2, 0.5, 1, 2, 3J) and with different number of pulses (1, 3, 10) using different electrical pump pulse width (333, 667, 1000 μs). The dynamics of the recoil action of a calculus phantom was monitored using a high-speed camera with frame rate up to 1 million frame per second (Photron Fastcam SA5); and the laser-induced craters were evaluated with a 3-D digital microscope (Keyence VHX-900F). A design of experiment software (DesignExpert-10, Minneapolis, MN, USA) is used in this study for the best fit of surface response on volume of dusting and retropulsion amplitude. The numerical formulas for the response surfaces of dusting speed and retropulsion amplitude are generated. More detailed investigation on the optimal conditions for dusting of other kinds of stone samples and the fiber size effect will be conducted as a future study.

Paper Details

Date Published: 20 February 2017
PDF: 9 pages
Proc. SPIE 10038, Therapeutics and Diagnostics in Urology: Lasers, Robotics, Minimally Invasive, and Advanced Biomedical Devices, 100380H (20 February 2017); doi: 10.1117/12.2250665
Show Author Affiliations
Jian J. Zhang, Boston Scientific Corp. (United States)
Jonathan Rutherford, Boston Scientific Corp. (United States)
Metasebya Solomon, Boston Scientific Corp. (United States)
Brian Cheng, Boston Scientific Corp. (United States)
Jason R. Xuan, Boston Scientific Corp. (United States)
Jason Gong, Boston Scientific Corp. (United States)
Honggang Yu, Boston Scientific Corp. (United States)
Michael Xia, Boston Scientific Corp. (United States)
Xirong Yang, Boston Scientific Corp. (United States)
Thomas Hasenberg, Boston Scientific Corp. (United States)
Sean Curran, Boston Scientific Corp. (United States)

Published in SPIE Proceedings Vol. 10038:
Therapeutics and Diagnostics in Urology: Lasers, Robotics, Minimally Invasive, and Advanced Biomedical Devices
Hyun Wook Kang; Kin Foong Chan, Editor(s)

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