Comparison of 808, 980, and 1075nm lasers for noninvasive thermal coagulation of the canine vas deferens, ex vivo

Christopher M. Cilip; Gino R. Schweinsberger; Nathaniel M. Fried

doi:10.1117/12.873293

17 February 2011 Comparison of 808, 980, and 1075nm lasers for noninvasive thermal coagulation of the canine vas deferens, ex vivo

Christopher M. Cilip, Gino R. Schweinsberger, Nathaniel M. Fried

Author Affiliations +

Proceedings Volume 7883, Photonic Therapeutics and Diagnostics VII; 78831B (2011) https://doi.org/10.1117/12.873293
Event: SPIE BiOS, 2011, San Francisco, California, United States

Abstract

Successful noninvasive laser coagulation of the canine vas deferens, in vivo, has been previously reported. However, the therapeutic window for treatment is relatively narrow. This study determines the dependence of vas thermal coagulation on laser wavelength for development of a noninvasive laser vasectomy procedure. Noninvasive laser coagulation of canine vas tissue, ex vivo, was performed using three commonly available near-infrared laser wavelengths: 808, 980, and 1075 nm. Each laser delivered an average power of 9.2 W, 500-ms pulse duration, pulse rate of 1.0-Hz, and 3.2-mm diameter laser spot, synchronized with cryogen spray cooling of the scrotal skin surface for a total treatment time of 60 s. Vas burst pressures were measured to determine strength of vas closure and compared to previously reported ejaculation pressures. Gross inspection of vas and scrotal skin was also performed immediately after the procedure as an indicator of thermal coagulation and skin burns. The 1075 nm laser produced the highest vas burst pressures (288 ± 28 mmHg), significantly greater than previously reported ejaculation pressures (136 ± 29 mmHg). The 808 nm wavelength produced insufficient vas burst pressures of 141 ± 61 mmHg, and minor scrotal skin burns were observed in at least one case. The 980 nm wavelength was unable to produce thermal coagulation of the vas, with low burst pressures (89 ± 58 mmHg) and severe scrotal skin burns. The 1075 nm wavelength was the only near-IR wavelength that consistently thermally coagulated the vas with a strong degree of closure and without any scrotal skin burns.

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Christopher M. Cilip, Gino R. Schweinsberger, and Nathaniel M. Fried "Comparison of 808, 980, and 1075nm lasers for noninvasive thermal coagulation of the canine vas deferens, ex vivo", Proc. SPIE 7883, Photonic Therapeutics and Diagnostics VII, 78831B (17 February 2011); https://doi.org/10.1117/12.873293

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KEYWORDS

Skin

Cryogenics

Pulsed laser operation

Fiber lasers

Laser development

Laser tissue interaction

Semiconductor lasers

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