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Proceedings Paper

Comparison of Ho:YAG and Er:YAG lasers for lithotripsy
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Paper Abstract

The contemporary medicine heads towards the minimally-invasive diagnosis and treatment methods. Laser-assisted lithotripsy is a minimally-invasive method for destroying or disruption of human urinary stones. The basic principle is the delivery of laser light to the place of urinary stones followed by the absorprion of laser radiation by the urinary stones material which resulted in ablation or plasma vaporization, and finished by fragmentation of urinary stones and spontaneous draining. For the purpose of minimally-invasive laser light delivery the optical fibres or sealed and flexible hollow waveguides are used. In this study we have compared the ablation effect of Ho:YAG laser (with the generated wavelength 2100 nm) and Er:YAG laser (with the generated wavelength 2940 nm) on the artificial samples (special compressed plaster) and human urinary stones in vitro. The reason for the investigating of Er:YAG laser radiation is the fact that the generated wavelength 2940 nm matches the local absorption of water and therefore it is potentially applicable in various medical branches. Both lasers operated in pulsed free-running regime. The Ho:YAG laser was clinically used laser system with low-OH fibre delivery. The Er:YAG laser was laboratory laser system and for the radiation delivery the special COP/Ag hollow glass waveguide sealed with fused silica cap. The ablation or perforation rates were measured and compared for both laser systems, various pulse energy levels and various interaction samples thickness. The interaction environment was water with temperature 25°C. Finally both lasers were tested for human urinary stones lithotripsy in vitro.

Paper Details

Date Published: 23 February 2009
PDF: 7 pages
Proc. SPIE 7161, Photonic Therapeutics and Diagnostics V, 71611H (23 February 2009); doi: 10.1117/12.808667
Show Author Affiliations
Helena Jelínková, Czech Technical Univ. (Czech Republic)
Oto Kőhler, Central Military Hospital (Czech Republic)
Mitsunobu Miyagi, Sendai National College of Technology (Japan)
Petr Koranda, Czech Technical Univ. (Czech Republic)
Michal Němec, Czech Technical Univ. (Czech Republic)
Jan Šulc, Czech Technical Univ. (Czech Republic)
Martin Fibrich, Czech Technical Univ. (Czech Republic)
Jan Pokorny, Central Military Hospital (Czech Republic)
Katsumasa Iwai, Sendai National College of Technology (Japan)
Yuji Matsuura, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 7161:
Photonic Therapeutics and Diagnostics V
Henry Hirschberg; Brian Jet-Fei Wong; Kenton W. Gregory; Reza S. Malek; Nikiforos Kollias; Bernard Choi; Guillermo J. Tearney; Justus F. R. Ilgner; Steen J. Madsen; Laura Marcu; Haishan Zeng, Editor(s)

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