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Proceedings Paper

Intraocular applications of the Ho:YAG laser
Author(s): Ernest V. Boiko M.D.; Vladimir F. Danilichev; Michael M. Shishkin; Yuri D. Berezin; Nicolay N. Smirnov; Victor V. Lazo
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Paper Abstract

Despite advances in mechanical vitrectomy, cutting dense membranes and fibrovascular strands remains a technical challenge. Widespread acceptance of carbon dioxide and Er:YAG lasers, which cutting potential and coagulative properties were highly evaluated by experimentators, now is limited because of insufficiently convenient fiberoptic delivery systems. We investigated the use of Ho:YAG laser emitting at 2.09 micrometers to cut experimental vitreous membranes in rabbits. Radiation at 2.09 micrometers is enough strongly absorbed by water (absorption length 385 micrometers ) and can be transmitted through silica fiberoptic delivery system practically without attenuation. At first, the dependence of retinal damage thresholds and wet field thermal effects from distance `endolaser tip--target', energy, pulse rates and number of pulses were determined. With the help of multiple regression analysis models of these processes were constructed. Coagulative and cutting properties of holmium endolaser were assessed on the created transvitreal membranes. Optimal parameters for cutting and coagulation were determined. Based on own experimental studies we also used Ho:YAG endolaser in vitrectomies for diabetes and traumas. The advantages and disadvantages of the 2.09 micrometers infrared wavelength of holmium laser photoincision and photocoagulation in vitreous are discussed.

Paper Details

Date Published: 22 May 1995
PDF: 7 pages
Proc. SPIE 2393, Ophthalmic Technologies V, (22 May 1995); doi: 10.1117/12.209861
Show Author Affiliations
Ernest V. Boiko M.D., Military Medical Academy (Russia)
Vladimir F. Danilichev, Military Medical Academy (Russia)
Michael M. Shishkin, Military Medical Academy (Russia)
Yuri D. Berezin, S.I. Vavilov State Optical Institute (Russia)
Nicolay N. Smirnov, S.I. Vavilov State Optical Institute (Russia)
Victor V. Lazo, S.I. Vavilov State Optical Institute (Russia)

Published in SPIE Proceedings Vol. 2393:
Ophthalmic Technologies V
Jean-Marie Parel; Qiushi Ren; Karen Margaret Joos M.D., Editor(s)

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