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Proceedings Paper

Ablation of vitreous tissue with a high-repetition-rate erbium:YAG laser
Author(s): Matthias Krause; Donald J. D'Amico
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Paper Abstract

The efficacy and predictability of Erbium (Er):YAG laser ablation of vitreous tissue and saline solution were determined. Both substances were ablated in vitro with an Er:YAG laser (pulse duration: 500 microsecond(s) ) connected to a sapphire fiber with the tip of the fiber placed in air. Pulse energies ranged between 1.0 and 20.8 mJ (vitreous) and 1.0 and 21.2 mJ (saline solution). Pulse repetition rates between 10 and 200 Hz were used. The net ablation rates were determined by weight measurement before and after laser treatment. Untreated control samples were used simultaneously to correct for evaporation. Net ablation rates were considered as the difference in the amounts of weight loss measured with and without laser treatment. Reproducible and constant ablation rates were found for both vitreous and saline solution in each of 3 consecutive measurements at constant laser parameters. Ablation rates did not significantly differ between both substances (p equals 0.25). The net ablation rates in both materials were found to increase linearly with increasing pulse frequency and nonlinearly with increasing pulse energy. The present studies suggest directions for the development of instrumentation for enhanced removal of vitreous and other tissues as well. These directions include the use of higher hertz (> 200) instruments and appropriately designed endo- probe geometries.

Paper Details

Date Published: 7 June 2000
PDF: 8 pages
Proc. SPIE 3908, Ophthalmic Technologies X, (7 June 2000); doi: 10.1117/12.387519
Show Author Affiliations
Matthias Krause, Harvard Medical School (United States)
Donald J. D'Amico, Harvard Medical School (United States)

Published in SPIE Proceedings Vol. 3908:
Ophthalmic Technologies X
Pascal O. Rol; Karen Margaret Joos M.D.; Fabrice Manns, Editor(s)

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