Pulsatile Flow Through a Bifurcation With a Cerebrovascular Aneurysm

[+] Author and Article Information
Tong-Miin Liou, Tzung-Wu Chang, Wen-Chin Chang

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 300, Republic of China

J Biomech Eng 116(1), 112-118 (Feb 01, 1994) (7 pages) doi:10.1115/1.2895694 History: Received April 29, 1992; Revised March 29, 1993; Online March 17, 2008


Laser-Doppler velocimetry measurements and flow visualization were complementarily made in pulsatile and steady flow in a cerebrovascular aneurysm model with bifurcation angles of 60, 90, and 140 deg, and volume-flow rate ratios between the branches of 1 to 1 and 3 to 1. The mean, peak, and minimal Reynolds numbers based on the bulk average velocity and diameter of the parent vessel were 600, 800, and 280, respectively. For uneven branch flow, it is found that the flow activity inside the aneurysm and the stresses acting on the aneurysmal wall increase with increasing bifurcation angle. More importantly, the present angle suggests the presence of a critical bifurcation angle below which the aneurysm is prone to thrombosis, whereas above which the aneurysm is susceptible to progression or rupture. For evenly distributed branch flow, the intra-aneurysmal flow is sluggish and therefore prone to thrombosis for all studied bifurcation angles.

Copyright © 1994 by The American Society of Mechanical Engineers
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