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

Shunichi Sato; Tsunenori Arai; Yi-Wei Shi; Yuji Matsuura; Mitsunobu Miyagi; Hiroshi Ashida

doi:10.1117/12.427917

4 June 2001 Myocardium tissue ablation with hollow-waveguide-delivered near-infrared nanosecond laser pulses

Shunichi Sato, Tsunenori Arai, Yi-Wei Shi, Yuji Matsuura, Mitsunobu Miyagi, Hiroshi Ashida

Proceedings Volume 4253, Optical Fibers and Sensors for Medical Applications; (2001) https://doi.org/10.1117/12.427917
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

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.

Citation Download Citation

Shunichi Sato, Tsunenori Arai, Yi-Wei Shi, Yuji Matsuura, Mitsunobu Miyagi, and Hiroshi Ashida "Myocardium tissue ablation with hollow-waveguide-delivered near-infrared nanosecond laser pulses", Proc. SPIE 4253, Optical Fibers and Sensors for Medical Applications, (4 June 2001); https://doi.org/10.1117/12.427917

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