Stents are tubular structure equipments which deployed to physically reopen stenotic regions of arteries. Although stents are widely used to restore blood flow, they increase the risk of restenosis in the vicinity of stenotic area. It seems that cross sectional geometry of stent has main effect on artery restenosis. In this study, tubular stents with different cross sectional geometries are considered in a coronary artery and Newtonian and non-Newtonian viscosity models are utilized to simulate blood rheology. The results show that streamlined stents prevent low and high wall shear stresses in the vicinity of the stent. Also, these stents decrease the risk of thrombosis and restenosis by eliminating the particle residence time in the region of stented vessel. On the other hand, results indicate that Newtonian model underestimates the wall shear stress within a stented arterial segment, which can lead to an overestimation of the risk of restenosis.

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