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TECHNICAL PAPERS

Heat-Induced Changes in the Mechanical Behavior of Passive Coronary Arteries

[+] Author and Article Information
T. Kang

Mechanical Engineering, University of Maryland

J. Resar

Department of Medicine, The Johns Hopkins University, Baltimore, MD 21205

J. D. Humphrey

Department of Mechanical Engineering, The University of Maryland, Baltimore, MD 21228

J Biomech Eng 117(1), 86-93 (Feb 01, 1995) (8 pages) doi:10.1115/1.2792274 History: Received March 05, 1993; Revised March 11, 1994; Online October 30, 2007

Abstract

We performed in vitro pressure-diameter and axial force-length experiments on nondiseased, passive bovine coronary arteries subjected to bath temperatures from 21 to 80° C for 90 s to 4 hr. Over the strain ranges studied, we found that: (a) vessel behavior remained the same over 20 min of testing at 21 to 55° C, (b) vessels stiffened multiaxially after 5 min of exposure to 60° C and continued to stiffen over 20 min of testing, (c) dramatic multiaxial vessel stiffening and shrinkage occurred after 90 s of exposure to 70 and 80° C, and (d) heat-induced changes at 70° C depended on the intraluminal pressure during heating. Thus, passive bovine coronary arteries exhibit a complex thermomechanical behavior that depends on the temperature, duration of thermal exposure, and the mechanical loads applied during heating.

Copyright © 1995 by The American Society of Mechanical Engineers
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