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Proceedings Paper

Experimental retinectomy with a 6.1 µm Q-switched Raman-shifted alexandrite laser
Author(s): Karen M. Joos; Ratna Prasad; John Kozub; Borislav Ivanov; Anita Agarwal; Jin H. Shen
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Paper Abstract

Purpose: It is hypothesized that 6.1 μm produced by a portable laser would be useful for incising tissue layers such as performing a retinectomy in detached retina with extensive anterior proliferative vitreoretinopathy. Methods: An alexandrite laser system, which provides a high-intensity Q-switched pulse (780 nm, 50-100 ns duration, 10 Hz), is wavelength-shifted by a two-stage stimulated Raman conversion process into the 6-7 μm range (Light Age, Inc.). Fresh cadaver porcine retinas were lased with 6.1 μm using a 200 μm diameter spot at 0.6 mJ after removal of the vitreous. Specimens were examined grossly and prepared for histological examination. Results: The Raman-shifted alexandrite laser produced a smooth Gaussian profile. A narrow spectrum was produced at 6.1 μm. A full-thickness retinal incision with minimal thermal damage was obtained at a low energy level of 0.6 mJ in the retinas. However, the depth of the incision did vary from an incomplete incision to a full-thickness incision involving the underlying choroidal layer in attached retinas. Conclusions: The 6.1 μm mid-infrared energy produced by a portable laser is capable of incising detached retinas with minimal thermal damage.

Paper Details

Date Published: 2 March 2010
PDF: 3 pages
Proc. SPIE 7550, Ophthalmic Technologies XX, 75500X (2 March 2010); doi: 10.1117/12.846890
Show Author Affiliations
Karen M. Joos, Vanderbilt Eye Institute (United States)
Ratna Prasad, Vanderbilt Eye Institute (United States)
John Kozub, Vanderbilt Univ. (United States)
Borislav Ivanov, Vanderbilt Univ. (United States)
Anita Agarwal, Vanderbilt Eye Institute (United States)
Jin H. Shen, Vanderbilt Eye Institute (United States)

Published in SPIE Proceedings Vol. 7550:
Ophthalmic Technologies XX
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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