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RESEARCH PAPERS

Attenuation of Flow Disturbances in Tapered Arterial Grafts

[+] Author and Article Information
R. A. Black, T. V. How

Institute of Medical and Dental Bioengineering, University of Liverpool, Liverpool L69 3BX U.K.

J Biomech Eng 111(4), 303-310 (Nov 01, 1989) (8 pages) doi:10.1115/1.3168383 History: Received October 26, 1988; Revised June 26, 1989; Online June 12, 2009

Abstract

Flow disturbances in tapered arterial grafts of angles of taper between 0.5 and 1.0 deg were measured in vitro using a pulsed ultrasound Doppler velocimeter. The increase in transition Reynolds numbers with angle of taper and axial distance was determined for steady flow. The instantaneous centerline velocities were measured distal to a 50 percent area stenosis (as a model of a proximal anastomosis), in steady and pulsatile flow, from which the disturbance intensities were calculated. A significant reduction in post-stenotic disturbance intensity was recorded in the tapered grafts, relative to a conventional cylindrical graft. In pulsatile flow with a large backflow component, however, there was an increase in disturbance intensity due to diverging flow during flow reversal. This was observed only in the 1.0 deg tapered graft. These findings indicate that taper is an important consideration in the design of vascular prostheses.

Copyright © 1989 by ASME
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