Abstract

Knowledge of the distinct fluid dynamic factors created by an intravascular stent, placed in an atherosclerotic artery and subjected to pulsatile flow, is limited. A computational fluid dynamics modeling approach was used in this research to analyze and measure the effect of single stent struts on the flow separation and reattachment points, and re-circulation regions. With the overall goal to effectively model a comprehensive stented atherosclerotic artery, this preliminary study focused on two dimensional flow at various points in the cross-section of a stent subjected to steady and pulsatile flow. The reattachment point is an area of increased wall shear stress gradients, and thus a concern when considering intimal hyperplasia. The results show that the reattachment point is a function of the longitudinal cross sectional geometry of the stent. Pulsatile flow results show the motion of the reattachment point with increasing and decreasing flow, as well as the relationship of the geometrical design of the stent and the existence of reattachment points between struts.

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