Dynamic Model of a Sac-Type Pneumatically Driven Artificial Ventricle

[+] Author and Article Information
D. B. Geselowitz, G. E. Miller, W. M. Phillips

Bioengineering Program and Department of Aerospace Engineering, Pennsylvania State University, University Park, Pa.

J Biomech Eng 99(1), 14-19 (Feb 01, 1977) (6 pages) doi:10.1115/1.3426261 History: Received October 26, 1976; Online October 21, 2010


Inlet and outlet pressures and flows were obtained over a wide range of operating conditions for a pneumatically driven sac-type artificial ventricle connected to a mechanical mock circulatory system. The load presented to the ventricle by the mock circulatory system was found to be characterized by a linear resistance and capacitance. A dynamic model for the ventricle which accounted for instantaneous pressures and flows was developed. The outlet port is characterized by an inertance and square law resistance; the inlet port is characterized by a nonlinear resistance dependent on the type of valve. The input to the model is the time varying sac pressure. The model predicts the fill-limited and ejection-limited modes of the artificial ventricle.

Copyright © 1977 by ASME
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