Blood Flow in a Brachial Artery Compressed Externally by a Pneumatic Cuff

[+] Author and Article Information
M. Shimizu

Department of Control Engineering, Tokyo Institute of Technology, Tokyo 152, Japan

J Biomech Eng 114(1), 78-83 (Feb 01, 1992) (6 pages) doi:10.1115/1.2895453 History: Received August 06, 1991; Revised September 30, 1991; Online March 17, 2008


Blood flow in human brachial arteries, compressed by a pneumatic cuff for blood pressure measurement, is examined using several different noninvasive techniques. From the experimental results it is shown that, when arterial pressure distal to the cuff is always lower than cuff pressure, flow in the artery under the cuff becomes supercritical near the cuff downstream margin and no reflection occurs there and the reflected wave from the peripheral vascular system of the arm does not propagate beyond the cuff downstream margin. Therefore an unsteady transition from supercritical to subcritical flow occurs near the cuff downstream margin. When the peak value of distal arterial pressure exceeds cuff pressure, a reflection occurs near the cuff downstream margin. The reflection becomes stronger corresponding to decrement of the cuff pressure and the whole artery segment under the cuff inflates fully at systole. At diastole, however, the artery segment under the cuff does not collapse completely and, hence, the phenomenon becomes that of pressure wave propagation in a partially collapsed artery segment.

Copyright © 1992 by The American Society of Mechanical Engineers
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