Shape Memory Alloy Clip for Compression Colonic Anastomosis

[+] Author and Article Information
Chengli Song1

Department of Surgery and Molecular Oncology,  University of Dundee, DD1 9SY, United Kingdomc.song@dundee.ac.uk

Tim Frank, Alfred Cuschieri

Department of Surgery and Molecular Oncology,  University of Dundee, DD1 9SY, United Kingdom


To whom correspondence should be addressed.

J Biomech Eng 127(2), 351-354 (Nov 08, 2004) (4 pages) doi:10.1115/1.1871195 History: Received January 07, 2004; Revised November 08, 2004

This study was setup to investigate the design and performance of a shape memory alloy clip for colonic anastomosis. The thermomechanical properties of the shape memory alloy material were studied and the data were used to derive a nonlinear material model. This enabled the development of computer computer aided design models and finite element analysis of the clip and tissue compression. The maximum strain of the anastomosis clip was within the recoverable range, and it exerted parallel compression of the colonic walls with a uniform pressure distribution. The design of the anastomosis clip was optimized for safe, simple, and effective use in colon surgery.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Shape memory alloy anastomosis clip and its applicator

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Figure 2

CAD models of the anastomosis clip in closed and open shapes

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Figure 3

Finite element models of the anastomosis clip and tissue compression

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Figure 4

Tensile testing of the NiTi SMA wire with different extensions

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Figure 5

(a) Tensile testing of individual clip at 24 and 37°C; (b) tensile testing of coils of clips

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Figure 6

Strain development during the loading process

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Figure 7

(a) Tissue deformation under clip compression; (b) equivalent stress distribution in the tissue



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