Measurement of Wall Deformation and Flow Limitation In a Mechanical Trachea

[+] Author and Article Information
C. Walsh

Institute of Biomedical Engineering, and Dept. of Electrical and Computer Engineering, University of Toronto

P. A. Sullivan, J. S. Hansen, L.-W. Chen

Institute for Aerospace Studies, University of Toronto

J Biomech Eng 117(1), 146-152 (Feb 01, 1995) (7 pages) doi:10.1115/1.2792262 History: Received October 04, 1993; Revised April 30, 1994; Online October 30, 2007


A mechanical model of the human trachea is investigated experimentally. A modified version of an earlier model, it consists of a square sectioned rigid tube in which part of one wall is removed, and replaced by a prestretched flat latex membrane. Air is drawn from atmosphere through an inlet into the rigid upstream tube; it then flows through the flexible section and finally through a rigid section Into a plenum chamber where suction is applied. As the membrane collapses in response to flow, the transmural pressure and deflection are measured at the mid-point. These values are used in conjunction with a finite deformation membrane wall theory to determine the elastic constant in a nonlinear material constitutive equation. This equation is used to predict the tube law. Results show that the flow limits at the long wave speed predicted by this law. Thus it behaves as a conventional collapsible tube while having the advantage of a rational wall model.

Copyright © 1995 by The American Society of Mechanical Engineers
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