Effect of Pleural Membrane on the Propagation of Rayleigh-Type Surface Waves in Inflated Lungs

[+] Author and Article Information
Chi-Sing Man

Department of Mathematics, University of Kentucky, Lexington, KY 40506

Mehran Jahed, Stephen J. Lai-Fook, Pramode K. Bhagat

Biomedical Engineering Center, University of Kentucky, Lexington, KY 40506

J. Appl. Mech 58(3), 731-737 (Sep 01, 1991) (7 pages) doi:10.1115/1.2897256 History: Received October 04, 1989; Revised June 05, 1990; Online March 31, 2008


We model the lung parenchyma as an elastic half-space and the pleura as a taut elastic membrane in smooth or in welded contact with the half-space. In each instance we deduce that the presence of a sufficiently high surface tension T in the pleural membrane will lead to the existence of a cutoff frequency f0 for the Rayleigh-type surface waves, and we derive an equation which gives T in terms of f0 and parameters that characterize the layered medium. We performed experiments on four inflated horse lungs at transpulmonary pressures of 5, 10, and 15 cmH2 O. A comparison of the experimental results and the theoretical predictions provides an empirical test to the validity of the modeling.

Copyright © 1991 by The American Society of Mechanical Engineers
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