✦ LIBER ✦

Measurement and modeling of thermal transients during Er:YAG laser irradiation of vitreous

✍ Scribed by Berger, Jeffrey W.; Bochow, Thomas W.; Talamo, Jonathan H.; D'Amico, Donald J.

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 803 KB
Volume: 19
Category: Article
ISSN: 0196-8092
DOI: 10.1002/(sici)1096-9101(1996)19:4<388::aid-lsm2>3.0.co;2-o

No coin nor oath required. For personal study only.

✦ Synopsis

Background and Objectdue: We investigated the transient thermal behavior of vitreous in order to understand the local thermal effects of laser output, and to predict the potential for unintentional injury during Er:YAG laser vitreoretinal surgery.

Study DesignfMaterials and Methods:

The output of a free-running Er:YAG laser (2.94 pm, 300 ps FWHM) was delivered through a fiberoptic and applied to en bloc samples of bovine vitreous. Temperature was measured with ultrafine thermocouples.

Results: For 6 mJ pulse energy at 10 Hz, a temperature rise of 20°C is measured 500 pm from the laser tip. The temperature rise is localized with a rapid fall-off greater than 1 mm from the energy source. At constant time-averaged laser power, the temperature profile is independent of repetition rate. Our fmite-difference model generates results qualitatively consistent with measured data and allows for investigation of the influence of thermophysical parameters on heat transfer.

Conclusion:

Thermal injury to ocular structures should be limited during intravitreal application of Er:YAG laser energy.

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