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TECHNICAL PAPERS

Measurements of Velocity and Wall Shear Stress Inside a PTFE Vascular Graft Model Under Steady Flow Conditions

[+] Author and Article Information
F. Loth

Department of Mechanical Engineering, University of Illinois at Chicago, 842 W. Taylor Street (M/C 251), Chicago, IL 60607-7022

S. A. Jones

Department of Biomedical Engineering. The Johns Hopkins University, Baltimore, MD

D. P. Giddens

Department of Mechanical Engineering. The Johns Hopkins University, Baltimore, MD

H. S. Bassiouny

Department of Surgery. The University of Chicago, Chicago, IL

S. Glagov

Department of Pathology. The University of Chicago, Chicago, IL

C. K. Zarins

Department Surgery, Stanford University, Palo Alto, CA

J Biomech Eng 119(2), 187-194 (May 01, 1997) (8 pages) doi:10.1115/1.2796079 History: Received May 16, 1995; Revised June 30, 1996; Online October 30, 2007

Abstract

The flow field inside a model of a polytetrafluoroethylene (PTFE) canine artery end-to-side bypass graft was studied under steady flow conditions using laser-Doppler anemometry. The anatomically realistic in vitro model was constructed to incorporate the major geometric features of the in vivo canine anastomosis geometry, most notably a larger graft than host artery diameter. The velocity measurements at Reynolds number 208, based on the host artery diameter, show the flow field to be three dimensional in nature. The wall shear stress distribution, computed from the near-wall velocity gradients, reveals a relatively low wall shear stress region on the wall opposite to the graft near the stagnation point approximately one artery diameter in axial length at the midplane. This low wall shear stress region extends to the sidewalls, suture lines, and along the PTFE graft where its axial length at the midplane is more than two artery diameters. The velocity distribution inside the graft model presented here provides a data set well suited for validation of numerical solutions on a model of this type.

Copyright © 1997 by The American Society of Mechanical Engineers
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