A Biphasic Poroelastic Analysis of the Flow Dependent Subcutaneous Tissue Pressure and Compaction Due to Epidermal Loadings: Issues in Pressure Sore

[+] Author and Article Information
Arthur F. T. Mak, Lidu Huang

Rehabilitation Engineering Centre, Hong Kong Polytechnic, Hunghom, Hong Kong

Qinque Wang

Department of Precision Mechanical Engineering, Shanghai University of Science & Technology, Shanghai, People’s Republic of China

J Biomech Eng 116(4), 421-429 (Nov 01, 1994) (9 pages) doi:10.1115/1.2895793 History: Received August 26, 1992; Revised January 10, 1994; Online March 17, 2008


A layer of skin and subcutaneous tissue on a bony substratum was modeled as a homogeneous layer of biphasic poroelastic material with uniform thickness. The epidermal surface and the bony interface were taken to be impervious. The soft tissue on the bony interface was assumed either fully adhered or completely free to slide on the bone. The cases for surface pressure loadings and displacement controlled indentations were simulated. The resultant biomechanical responses of the layer, including the transient tissue hydrostatic pressure and the tissue compaction, were presented. A new hypothesis is offered to interpret the threshold pressure-time curve for pressure sores in term of the time required for a particular area in the tissue layer to reach a critical compaction for a given level of applied pressure.

Copyright © 1994 by The American Society of Mechanical Engineers
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