Distensibility characteristics of caval veins and empirical exponential formulae

Issue title: 25th Anniversary Volume. Perspectives in Biorheology II. Festschrift for Syoten Oka

Guest editors: Eiichi Fukada and Takehiko Azuma

Article type: Research Article

Authors: Sakanishi, Akio^a | Hasegawa, Masamitsu^b | Dobashi, Toshiaki^a

Affiliations: [a] Department of Polymer Science, Faculty of Technology, Gunma University, Kiryu, Gunma 376, Japan | [b] Department of Vascular Physiology, National Cardiovascular Center Research Institute, Suita, Osaka 565, Japan

Abstract: The stress-strain curves of the vena cava have been measured of vena cava superior, and the intrathoracic and abdominal portions of vena cava inferior excised from dogs. The stress σ is expressed by the exponential function of the strain γ as follows: σ=σ0[exp(γ/γ0)−1] in the longitudinal direction, and σ=σ1[exp(γ/γ1)−1]+σ2[exp(γ/γ2)−1] in the circumferential one for all the three kinds of veins. The constants σ0, γ0, σ1, γ1, σ2 and γ2 are determined by a nonlinear least squares method.

Keywords: Distensibility, Stress-strain curves, Nonlinear elasticity, Caval veins, Exponential formulae

DOI: 10.3233/BIR-1988-251-224

Journal: Biorheology, vol. 25, no. 1-2, pp. 165-172, 1988