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RESEARCH PAPERS

Model Studies at Mechanical Aortic Heart Valve Prostheses—Part I: Steady-State Flow Fields and Pressure Loss Coefficients

[+] Author and Article Information
Martin Knoch, Helmut Reul, Ralf Kröger, Günter Rau

Helmholtz-Institute for Biomedical Engineering, at the Aachen University of Technology, D-5100 Aachen, Federal Republic of Germany

J Biomech Eng 110(4), 334-343 (Nov 01, 1988) (10 pages) doi:10.1115/1.3108450 History: Received December 21, 1987; Revised July 20, 1988; Online June 12, 2009

Abstract

In a 3:1 scaled model of the human aorta models of the Omniscience, Björk-Shiley Convexo-Concave, Björk-Shiley Monostrut, Medtronic-Hall, Duromedics (Hemex) and the Saint Jude Medical heart valve prostheses are studied in steady flow representing the systolic peak flow phase. Detailed flow visualization experiments show flow separations at all inner ring surfaces as well as at most of the occluders. The resulting stagnation areas increase the risk of thrombus accumulation. Flow separations also stimulate vortex formation and turbulent mixing at the downstream jet boundaries and thus may intensify blood damage by turbulent shear stresses. The different influences of struts and occluder guides on the flow around the occluders are discussed. The effects of the individual valve components on the flow fields are analyzed and correlated with the resulting pressure losses.

Copyright © 1988 by ASME
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