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1 Sep 2003

Volume 83, Issue 9, pp. 1689-1898

Issue Cover Spotlight Figure

Appl. Phys. Lett. 83, 1710 (2003); http://dx.doi.org/10.1063/1.1605792 (3 pages)

G. D. Chern, H. E. Tureci, A. Douglas Stone, R. K. Chang, M. Kneissl, and N. M. Johnson
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Optimized deployment of heat-activated surgical staples using thermography

Y. Ng, C. Song, D. McLean, S. M. Shimi, T. G. Frank, A. Cuschieri, and P. A. Campbell

Appl. Phys. Lett. 83, 1884 (2003); http://dx.doi.org/10.1063/1.1601305 (3 pages) | Cited 4 times

Online Publication Date: 26 August 2003

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We have developed a suture analogue, suitable for use in laparoscopic surgery, in the form of a staple constructed from NiTi shape memory alloy (SMA). Closure of the staple is effected by resistive heating via a (50–100 ms) pulse of electrical current (≈5 A). In order to optimize deployment protocols and minimize thermal collateral damage to tissue, the heat sink effect of the electrical contact rails, as well as the presence of contact hotspots must be considered. Here, we have employed high-resolution thermal imaging to observe the dynamic temperature distributions in SMA staples as a function of the pulse parameters. This has facilitated process optimization and also provided data from which to validate computational finite-element models of the heat transport phenomena. © 2003 American Institute of Physics.
Show PACS
87.50.wp Therapeutic applications
87.19.Pp Biothermics and thermal processes in biology
02.70.Dh Finite-element and Galerkin methods
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