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Related Experiment Videos

Technical developments for cerebral thermal treatment: water-cooled diffusing laser fibre tips and

R J McNichols1, M Kangasniemi, A Gowda

  • 1Department of Imaging Physics, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030-4009, USA. roger@biotexmedical.com

International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group
|November 13, 2003
PubMed
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Water-cooled laser tips create larger, safer thermal lesions than uncooled tips. This advancement in laser surgery enables higher power delivery for improved treatment outcomes in various tissues.

Area of Science:

  • Medical Devices
  • Laser Surgery
  • Thermal Ablation

Background:

  • Laser-induced thermal ablation is a key surgical technique.
  • Controlling lesion size and preventing thermal damage are critical.
  • Current methods using diffusing tips face limitations in power delivery and tip integrity.

Purpose of the Study:

  • To compare the efficacy of water-cooled versus non-cooled diffusing tips for laser thermal lesion generation.
  • To evaluate the safety and control of thermal lesions produced by water-cooled tips.
  • To assess the impact of water cooling on laser fiber tip durability and lesion characteristics.

Main Methods:

  • In vitro studies on beef myocardium and in vivo canine models.
  • Utilized a 980 nm diode laser with water-cooled and non-cooled diffusing tips.

Related Experiment Videos

  • Employed two-plane magnetic resonance thermal imaging (MRTI) for real-time monitoring and feedback.
  • Assessed lesion dimensions, charring, and tip failure at various power levels.

    • Main Results:

    • Water-cooled tips withstood higher power (up to 9.5 W for 8 min) without failure, unlike uncooled tips which failed rapidly at lower power levels.
    • Lesions produced with water-cooled tips showed significantly larger dimensions (up to 26.5 x 23.3 mm in vitro; 18.1 x 21.4 mm in vivo) and minimal charring.
    • Uncooled tips resulted in charring and smaller lesions due to premature failure.

    Conclusions:

    • Water cooling significantly enhances the safety and effectiveness of laser diffusing tips.
    • Higher power delivery is achievable with water-cooled tips, leading to larger and better-controlled thermal lesions.
    • Two-plane MRTI is a valuable tool for precise monitoring and control during laser thermal ablation procedures.