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Infrared laser bone ablation.

R C Nuss1, R L Fabian, R Sarkar

  • 1Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston.

Lasers in Surgery and Medicine
|January 1, 1988
PubMed
Summary
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This study compared five infrared lasers for bone ablation in vitro. Continuous-wave lasers caused significantly more thermal damage to bone tissue than pulsed lasers.

Area of Science:

  • Biomedical Engineering
  • Laser Physics
  • Surgical Technology

Background:

  • Infrared lasers are utilized in surgical procedures for tissue ablation.
  • Understanding laser-tissue interactions is crucial for optimizing surgical outcomes and minimizing collateral damage.
  • Different laser wavelengths and modes (pulsed vs. continuous-wave) exhibit distinct thermal effects on biological tissues.

Purpose of the Study:

  • To investigate and compare the bone ablation characteristics of five different infrared lasers.
  • To quantify etch rates and assess the zone of thermal damage associated with each laser type.
  • To explore the mechanisms underlying bone ablation and laser-induced tissue damage.

Main Methods:

  • In vitro ablation of guinea pig calvarium using five infrared lasers: pulsed Nd:YAG (1.064 µm), Hol:YSGG (2.10 µm), Erb:YAG (2.94 µm), continuous-wave Nd:YAG (1.064 µm), and CO2 (10.6 µm).

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  • Quantitative measurement of etch rates for pulsed lasers.
  • Histological examination using light microscopy to determine the zone of thermal damage adjacent to ablated bone.

    • Main Results:

    • Pulsed lasers (Nd:YAG, Erb:YAG, Hol:YSGG) demonstrated varying degrees of bone ablation efficiency and thermal damage.
    • The zone of thermal damage was smallest for pulsed Nd:YAG and Erb:YAG lasers (10–15 µm).
    • Hol:YSGG lasers resulted in a moderate zone of damage (20–90 µm), while continuous-wave Nd:YAG and CO2 lasers produced the largest zones of thermal damage (60–135 µm).

    Conclusions:

    • Pulsed infrared lasers offer more precise bone ablation with less thermal damage compared to continuous-wave lasers.
    • Laser wavelength and mode significantly influence the thermal effects on bone tissue during ablation.
    • Further research into laser-tissue interaction mechanisms can guide the selection of optimal lasers for bone surgery.