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

Research output: Contribution to journalConference article

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°, 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.

Original languageEnglish
Pages (from-to)155-160
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4253
DOIs
Publication statusPublished - 2001 Jan 1
EventOptical Fibers and Sensors for Medical Applications - San Jose, CA, United States
Duration: 2001 Jan 202001 Jan 21

Keywords

  • 1064 nm
  • Energy/power transmission
  • Myocardium tissue ablation
  • Nanosecond pulsed laser
  • Photodisruption
  • Vacuum-cored hollow waveguide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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