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Proceedings Paper

Myocardium tissue ablation with hollow-waveguide-delivered near-infrared nanosecond laser pulses
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Paper Abstract

With 1064-nm, nanosecond laser pulses delivered from hollow waveguide, ablation characteristics of porcine myocardium tissue have been investigated in vitro. For the hollow waveguide a vacuum-cored scheme was introduced to suppress the laser-induced air breakdown that limited the available transmitted laser energy/power. The delivered laser pulse beam was focused with a collimation lens and a focusing lens, and it was shown that higher efficiency ablation was obtained when a focusing lens with a shorter focal length was used. Waveguide bending (bending angle 90 degree(s)C, bending radius approximately 50 cm) caused no deteriorating effect on the ablation characteristics for ablation energies up to approximately 60 mJ/pulse. It was demonstrated that deep and sharp ablated holes with aspect ratios > 8 was obtained with the hollow-waveguide-delivered laser pulses. It may be a realistic option to aim at using the present hollow waveguide system for trocar-based applications or replacing articulated mirror-based laser delivery systems. It is an important part of the future works to downsize the waveguide output unit for catheter-based applications.

Paper Details

Date Published: 4 June 2001
PDF: 6 pages
Proc. SPIE 4253, Optical Fibers and Sensors for Medical Applications, (4 June 2001); doi: 10.1117/12.427917
Show Author Affiliations
Shunichi Sato, National Defense Medical College Research Institute (Japan)
Tsunenori Arai, National Defense Medical College (Japan)
Yi-Wei Shi, Tohoku Univ. (Japan)
Yuji Matsuura, Tohoku Univ. (Japan)
Mitsunobu Miyagi, Tohoku Univ. (Japan)
Hiroshi Ashida, National Defense Medical College Research Institute (Japan)

Published in SPIE Proceedings Vol. 4253:
Optical Fibers and Sensors for Medical Applications
Israel Gannot, Editor(s)

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