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Proceedings Paper

Effects of pulsed mid-IR lasers on bovine knee joint tissues
Author(s): Sandor G. Vari; Wei-Qiang Shi; Vani R. Pergadia; J. Timothy Duffy; J. M. Miller; Maurits J. van der Veen; Andrew B. Weiss; Michael C. Fishbein; Warren S. Grundfest
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Paper Abstract

We investigated the effect of varying Tm:YAG (2.014 micrometers ) and Ho:YAG (2.130 micrometers ) laser parameters on ablation rate and consequent thermal damage. Mid-infrared wavelengths are strongly absorbed by most biological tissues due to the tissue's high water content. The ablation rate of fresh bovine knee joint tissues (fibrous cartilage, hyaline cartilage, and bone) in saline was assessed as a function of radiant exposure (160 - 950 J/cm2), at pulse widths of 200 microsecond(s) ec for Tm:YAG and 250 microsecond(s) ec for Ho:YAG and a repetition rate of 2 Hz. All tissues used in this study could be efficiently ablated using two micron lasers. The mechanism of action is likely related to the formation and collapse of cavitation bubbles, associated with mid-infrared lasers. We concluded that the Tm:YAG and Ho:YAG lasers are capable of effective knee joint tissue ablation.

Paper Details

Date Published: 21 July 1993
PDF: 12 pages
Proc. SPIE 1880, Lasers in Orthopedic, Dental, and Veterinary Medicine II, (21 July 1993); doi: 10.1117/12.148330
Show Author Affiliations
Sandor G. Vari, Cedars-Sinai Medical Ctr. (United States)
Wei-Qiang Shi, Cedars-Sinai Medical Ctr. (United States)
Vani R. Pergadia, Cedars-Sinai Medical Ctr. (United States)
J. Timothy Duffy, Cedars-Sinai Medical Ctr. (United States)
J. M. Miller, Cedars-Sinai Medical Ctr. (United States)
Maurits J. van der Veen, Cedars-Sinai Medical Ctr. (United States)
Andrew B. Weiss, Cedars-Sinai Medical Ctr. (United States)
Michael C. Fishbein, Cedars-Sinai Medical Ctr. (United States)
Warren S. Grundfest, Cedars-Sinai Medical Ctr. (United States)


Published in SPIE Proceedings Vol. 1880:
Lasers in Orthopedic, Dental, and Veterinary Medicine II
Dov Gal; Stephen J. O'Brien; C. T. Vangsness; Joel M. White; Harvey A. Wigdor, Editor(s)

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