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Proceedings Paper

Low-temperature solder for laser tissue welding
Author(s): Antonio Lauto; Robert B. Stewart; D. Felsen; John Foster; Laura Poole-Warren; Dix P. Poppas M.D.
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Paper Abstract

In this study, a two layer (TL) solid solder was developed with a fixed thickness to minimize the difference in temperature across the solder (ΔT) and to weld at low temperature. Solder strips comprising two layers (65% albumin, 35% water) were welded onto rectangular sections of dog small intestine by a diode laser (λ = 808 nm). The laser delivered a power of 170 ± 10 mW through an optical fiber (spot size approximately 1 mm) for 100 seconds. A solder layer incorporated also a dye (carbon black, 0.25%) to absorb the laser radiation. A thermocouple and an infrared thermometer system recorded the temperatures at the tissue interface and at the external solder surface, during welding. The repaired tissue was tested for tensile strength by a calibrated tensiometer. The TL strips were able to minimize ΔT (12 ± 4°C) and control the temperature at tissue-interface. The strips fused on tissue at 55≤T≤62°C had higher tensile strength than the strips soldered at 51≤T<55°C (19.1 ± 6.6 versus 13.1 ± 6.4 gmf). The solid solder could efficiently weld at 60°C as it became insoluble and formed stable bonds with tissue. Fluid albumin solders, by contrast, requires temperatures ≥70°C for tissue repair, which cause more irreversible thermal damage.

Paper Details

Date Published: 12 December 2003
PDF: 8 pages
Proc. SPIE 5287, Laser Florence 2002: A Window on the Laser Medicine World, (12 December 2003); doi: 10.1117/12.544880
Show Author Affiliations
Antonio Lauto, Univ. of New South Wales (Australia)
Robert B. Stewart, ABIOMED, Inc. (United States)
D. Felsen, Weill Medical College/Cornell Univ. (United States)
John Foster, Univ. of New South Wales (Australia)
Laura Poole-Warren, Univ. of New South Wales (Australia)
Dix P. Poppas M.D., Weill Medical College/Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 5287:
Laser Florence 2002: A Window on the Laser Medicine World
Leonardo Longo; Alfons G. Hofstetter; Mihail-Lucien Pascu; Wilhelm R. A. Waidelich, Editor(s)

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