Flow structures at the proximal side-to-end anastomosis. Influence of geometry and flow division

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Department of Clinical Engineering, University of Liverpool, Liverpool L69 3BX, United Kingdom [1 ]
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J. BIOMECH. ENG. | / 2卷 / 224-236期
关键词：
Cardiovascular system - Flow patterns - Flow visualization - Geometry - Laminar flow - Lighting - Particles (particulate matter) - Polyurethanes - Pulsatile flow - Reynolds number - Three dimensional - Vortex flow;
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摘要：
Flow structures were visualized in transparent polyurethane models of proximal side-to-end vascular anastomoses, using planar illumination of suspended tracer particles. Both the effects of geometry and flow division were determined under steady and pulsatile flow conditions, for anastomosis angles 15, 30, and 45 degrees. The flow patterns were highly three-dimensional and were characterized by a series of vortices in the fully occluded distal artery and two helical vortices aligned with the axis of the graft. In steady flow, above a critical Reynolds number, the flow changed from a laminar regime to one displaying time-dependent behavior.
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