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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsI. Gannot
Pages155-160
Number of pages6
Volume4253
DOIs
Publication statusPublished - 2001
Externally publishedYes
EventOptical Fibers and Sensors for Medical Applications - San Jose, CA, United States
Duration: 2001 Jan 202001 Jan 21

Other

OtherOptical Fibers and Sensors for Medical Applications
CountryUnited States
CitySan Jose, CA
Period01/1/2001/1/21

Fingerprint

myocardium
Infrared lasers
Ablation
infrared lasers
ablation
Laser pulses
hollow
Waveguides
Tissue
waveguides
pulses
lasers
lenses
Lenses
Lasers
waveguide lasers
collimation
Catheters
aspect ratio
delivery

Keywords

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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Sato, S., Arai, T., Shi, Y. W., Matsuura, Y., Miyagi, M., & Ashida, H. (2001). Myocardium tissue ablation with hollow-waveguide-delivered, near-infrared, nanosecond laser pulses. In I. Gannot (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4253, pp. 155-160) https://doi.org/10.1117/12.427917

Myocardium tissue ablation with hollow-waveguide-delivered, near-infrared, nanosecond laser pulses. / Sato, S.; Arai, Tsunenori; Shi, Y. W.; Matsuura, Y.; Miyagi, M.; Ashida, H.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / I. Gannot. Vol. 4253 2001. p. 155-160.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sato, S, Arai, T, Shi, YW, Matsuura, Y, Miyagi, M & Ashida, H 2001, Myocardium tissue ablation with hollow-waveguide-delivered, near-infrared, nanosecond laser pulses. in I Gannot (ed.), Proceedings of SPIE - The International Society for Optical Engineering. vol. 4253, pp. 155-160, Optical Fibers and Sensors for Medical Applications, San Jose, CA, United States, 01/1/20. https://doi.org/10.1117/12.427917
Sato S, Arai T, Shi YW, Matsuura Y, Miyagi M, Ashida H. Myocardium tissue ablation with hollow-waveguide-delivered, near-infrared, nanosecond laser pulses. In Gannot I, editor, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4253. 2001. p. 155-160 https://doi.org/10.1117/12.427917
Sato, S. ; Arai, Tsunenori ; Shi, Y. W. ; Matsuura, Y. ; Miyagi, M. ; Ashida, H. / Myocardium tissue ablation with hollow-waveguide-delivered, near-infrared, nanosecond laser pulses. Proceedings of SPIE - The International Society for Optical Engineering. editor / I. Gannot. Vol. 4253 2001. pp. 155-160
@inproceedings{1e6da47a8e29445b90f096ec00218cde,
title = "Myocardium tissue ablation with hollow-waveguide-delivered, near-infrared, nanosecond laser pulses",
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.",
keywords = "1064 nm, Energy/power transmission, Myocardium tissue ablation, Nanosecond pulsed laser, Photodisruption, Vacuum-cored hollow waveguide",
author = "S. Sato and Tsunenori Arai and Shi, {Y. W.} and Y. Matsuura and M. Miyagi and H. Ashida",
year = "2001",
doi = "10.1117/12.427917",
language = "English",
volume = "4253",
pages = "155--160",
editor = "I. Gannot",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",

}

TY - GEN

T1 - Myocardium tissue ablation with hollow-waveguide-delivered, near-infrared, nanosecond laser pulses

AU - Sato, S.

AU - Arai, Tsunenori

AU - Shi, Y. W.

AU - Matsuura, Y.

AU - Miyagi, M.

AU - Ashida, H.

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

KW - 1064 nm

KW - Energy/power transmission

KW - Myocardium tissue ablation

KW - Nanosecond pulsed laser

KW - Photodisruption

KW - Vacuum-cored hollow waveguide

UR - http://www.scopus.com/inward/record.url?scp=0034870776&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034870776&partnerID=8YFLogxK

U2 - 10.1117/12.427917

DO - 10.1117/12.427917

M3 - Conference contribution

AN - SCOPUS:0034870776

VL - 4253

SP - 155

EP - 160

BT - Proceedings of SPIE - The International Society for Optical Engineering

A2 - Gannot, I.

ER -