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Proceedings Paper

Rate process models for thermal welding
Author(s): Scott A. Prahl; S. D. Pearson
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Paper Abstract

Laser tissue welding is a thermal process for binding tow tissues together. Optical and thermal models exist to calculate the temperatures of laser irradiated tissues. However, a rate process model is required to relate the time-temperature history to a weld strength. This paper proposes a first-order rate process model based on contraction during heating. The entropy and enthalpy associated with contraction of porcine intestine in a water bath was measured and used to calculate the fraction of altered molecules for both water bath and laser welding. Intestine was welded to intestine in a water bath at 60-80 degrees C for seven minutes. Pulsed laser welding used 10-30 pulses and an exogenous chromophore. The yield strengths of the welds were measured and found to roughly correlate with the fraction of altered molecules estimated for both the water bath and laser welds.

Paper Details

Date Published: 16 June 1997
PDF: 8 pages
Proc. SPIE 2975, Laser-Tissue Interaction VIII, (16 June 1997); doi: 10.1117/12.275486
Show Author Affiliations
Scott A. Prahl, Oregon Medical Laser Ctr. (United States)
S. D. Pearson, Oregon Medical Laser Ctr. (United States)

Published in SPIE Proceedings Vol. 2975:
Laser-Tissue Interaction VIII
Steven L. Jacques, Editor(s)

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