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New semiconductor laser for vitreoretinal surgery

C Azzolini1, P G Gobbi, R Brancato

  • 1Department of Ophthalmology and Visual Sciences, Scientific Institute H.S. Raffaele, University of Milan, Italy.

Lasers in Surgery and Medicine
|January 1, 1996
PubMed
Summary
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A continuous wave (CW) diode laser shows promise for vitreoretinal surgery, creating retinotomies in rabbit eyes. Further development is needed for effective membrane cutting.

Area of Science:

  • Ophthalmology
  • Surgical Technology
  • Biomedical Engineering

Background:

  • Investigating novel laser applications in vitreoretinal surgery.
  • Evaluating continuous wave (CW) diode laser capabilities for cutting.

Purpose of the Study:

  • To assess the efficacy of a CW diode laser for retinotomies and membrane cutting in ophthalmic procedures.
  • To evaluate laser-induced tissue effects on the chorioretina.

Main Methods:

  • Utilized a 1.94-micron wavelength CW diode laser (300 mW optical power).
  • Performed retinotomies and membrane cutting on rabbit eyes using contact and non-contact methods.
  • Delivered laser via a 200-micron core silica fiber and 20-gauge handpiece.
  • Histological analysis of chorioretinal lesions.

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Main Results:

  • Achieved full-thickness retinotomies with 120 mJ energy.
  • Observed larger coagulation halos with non-contact versus contact procedures.
  • Thermal damage zone ranged from 50-200 microns.
  • Limited efficacy on epiretinal membranes, achieving only superficial ablation.

Conclusions:

  • The CW 2-micron diode laser has potential for vitreoretinal surgery.
  • Higher output irradiance is required for enhanced efficacy, particularly for membrane cutting.