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TECHNICAL PAPERS

Influence of Elastic Nonlinearity on Arterial Anastomotic Compliance

[+] Author and Article Information
G. S. Schajer, S. I. Green

University of British Columbia, Vancouver, B.C., Canada

A. P. Davis

Department of Mechanical Engineering, University of British Columbia, Vancouver, B.C., Canada

Y. N.-H. Hsiang

Department of Vascular Surgery. University of British Columbia, Vancouver, B.C., Canada

J Biomech Eng 118(4), 445-451 (Nov 01, 1996) (7 pages) doi:10.1115/1.2796030 History: Received August 07, 1994; Revised September 23, 1995; Online October 30, 2007

Abstract

This study illustrates how the highly nonlinear elastic behavior of artery wall material can cause unusual structural characteristics that do not occur with a linear-elastic material. An example mathematical model of an end-to-end anastomosis successfully predicts the experimentally observed area of elevated elastic compliance, called the “Para-anastomotic Hypercompliant Zone” (PHZ). The elastic hypercompliance is shown to occur because the anastomosis locally restricts the arterial diameter, thus forcing the adjacent material to remain in a lower strain, and correspondingly a lower stiffness, part of its non-linear stress-strain curve. Elevated elastic compliance can be avoided by locally matching both the arterial diameter and the elastic compliance within the physiological pressure range.

Copyright © 1996 by The American Society of Mechanical Engineers
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