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

S. Sato, T. Arai, Y. W. Shi, Y. Matsuura, M. Miyagi, H. Ashida

研究成果: Conference article査読


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°, bending radius ∼ 50 cm) caused no deteriorating effect on the ablation characteristics for ablation energies up to ∼ 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.

ジャーナルProceedings of SPIE - The International Society for Optical Engineering
出版ステータスPublished - 2001 1月 1
イベントOptical Fibers and Sensors for Medical Applications - San Jose, CA, United States
継続期間: 2001 1月 202001 1月 21

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学


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