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Proceedings Paper

Comparison of the Lithoclast Ultra and Cyberwand in a cystolitholapaxy model
Author(s): Michael K. Louie; Gregory Lowe; Bodo E. Knudsen
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Paper Abstract

The Lithoclast Ultra(R) combines ultrasonic and pneumatic lithotripsy with a single handpiece, while the Cyberwand(R) combines two concentric ultrasonic lithotrites. We tested each device in a cystolitholapaxy model. An ex vivo bladder model was constructed. The test stones used were the Bego and U-30. For the Lithoclast Ultra, 10 trials of each stone type were performed. The ultrasound was tested at 90% duty and 100% power and the pneumatic tested at 12Hz. For the Cyberwand, the 'Large' stone and 'Small' stone setting were tested. Twenty trials with the U-30 stone were performed at each setting. Only 1 Bego stone finished Cyberwand testing. The time to clear all stone fragments was recorded. For the U-30 stones, the total time to stone clearance was 127 seconds for the Lithoclast Ultra, 41 seconds for the Cyberwand (Large setting) (p=0.001), and 69 seconds for the Cyberwand (Small setting)(p=0.12). For the Bego stones, the time to 5mm fragments and the total time to stone clearance was 14 and 22 minutes for the Lithoclast Ultra. The Cyberwand probe failed repeatedly during Bego stone testing. Four probes were required to completely eliminate a single Bego stone. For the softer U-30 stones, the Cyberwand time to stone clearance was significantly faster than the Lithoclast Ultra (p<0.05). For the harder Bego stones, the Cyberwand was not able to complete the trial due to repeated probe failure, and was outperformed by the Lithoclast Ultra.

Paper Details

Date Published: 8 February 2008
PDF: 6 pages
Proc. SPIE 6842, Photonic Therapeutics and Diagnostics IV, 684215 (8 February 2008); doi: 10.1117/12.762891
Show Author Affiliations
Michael K. Louie, Univ. of California, Irvine Medical Ctr. (United States)
Gregory Lowe, The Ohio State Univ. Medical Ctr. (United States)
Bodo E. Knudsen, The Ohio State Univ. Medical Ctr. (United States)

Published in SPIE Proceedings Vol. 6842:
Photonic Therapeutics and Diagnostics IV
Kenton W. Gregory M.D.; Reza S. Malek M.D.; Nikiforos Kollias; Brian Jet-Fei Wong M.D.; Henry Hirschberg M.D.; Justus F. R. Ilgner M.D.; Steen J. Madsen; Guillermo J. Tearney M.D.; Bernard Choi; Haishan Zeng, Editor(s)

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