Flexible delivery of Er:YAG radiation at 2.94 μm with novel hollow-core silica glass fibres: demonstration of tissue ablation

Artur Urich, Robert Raimund Josef Maier, Jonathan C Knight, Fei Yu, Duncan Paul Hand, Jonathan D Shephard

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

3 Citations (Scopus)

Abstract

In this work we present the delivery of high energy Er:YAG laser pulses operating at 2.94 mu m through a hollow-core negative curvature fibre (HC-NCF) and a hollow-core photonic crystal fibre (HC-PCF) and their use for the ablation of biological tissue. In HC-NCF fibres, which have been developed recently, the laser radiation is confined in a hollow core and by an anti-resonant or reflection principle (also known as ARROW). Both fibres are made of fused silica which has high mechanical and chemical durability, is bio-inert and results in a fibre with the flexibility that lends itself to easy handling and minimally invasive procedures. The HC-NCF structure consists of only one ring of capillaries around a realtively large core, followed by a protecting outer layer, hence the preform is relatively easy to build compared to traditional HC-PCF. The measured attenuation at 2.94 mu m is 0.06 dB/m for the HC-NCF and 1.2 dB/m for the HC-PCF. Both fibres have a single mode output beam profile which can be advantageous for surgical applications as the beam profile is maintained during fibre movement. We demonstrate delivery of high energy pulses through both fibres, well above the thresholds needed for the ablation of biological tissue in non-contact and contact mode. Delivered energy densities reached > 750 J/cm(-2) after 10 m of HC-NCF and > 3400 J/cm(2) through a 44 cm HC-PCF.

This flexible high energy delivery system offers an alternative to existing beam delivery systems such as articulated arms and large core multi-mode fibres with enhanced capabilities.

Original languageEnglish
Title of host publicationOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIII
EditorsIsrael Gannot
PublisherSPIE
Number of pages7
Volume8576
ISBN (Print)978-0-8194-9345-3
DOIs
Publication statusPublished - 2013
EventOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIII - San Francisco, United States
Duration: 2 Feb 20133 Feb 2013

Publication series

NameProceedings of SPIE
Volume8576
ISSN (Print)1996-756X
ISSN (Electronic)0277-786X

Conference

ConferenceOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIII
CountryUnited States
CitySan Francisco
Period2/02/133/02/13

Keywords

  • Hollow Core-Negative Curvature Fibre (HC-NCF) Er:YAG
  • Surgery
  • Fibre delivery
  • End-tip
  • End-cap
  • Fibre sealing
  • Tissue ablation
  • PHOTONIC-CRYSTAL FIBERS
  • WAVE-GUIDES
  • NANOSECOND PULSES
  • GERMANIUM OXIDE
  • OPTICAL-FIBERS
  • LASER-PULSES
  • SINGLE-MODE
  • YAG LASER
  • ERBIUM

Cite this

Urich, A., Maier, R. R. J., Knight, J. C., Yu, F., Hand, D. P., & Shephard, J. D. (2013). Flexible delivery of Er:YAG radiation at 2.94 μm with novel hollow-core silica glass fibres: demonstration of tissue ablation. In I. Gannot (Ed.), Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIII (Vol. 8576). (Proceedings of SPIE; Vol. 8576). SPIE. https://doi.org/10.1117/12.2002430