Abstract: The interaction of intravascular stent, stenotic artery and blood characterized with shear thinning is analyzed to investigate the induced arterial injury during implantation of a stent into a curved artery. Computational fluid-structure interaction model with S-type and N-type stents is presented to anticipate the plaque vulnerability based on three indices including the peak plaque stress, highest wall shear stress and wall equivalent stress, and the resultant arterial restenosis based on lowest wall shear stress. The numerical results show that the developed peak plaque stress, peak wall shear stress and peak wall equivalent stress for the N-type stent is less than the counterparts for the S-type stent, which suggest that the former takes a lower risk of plaque rupture than the latter. Compared with the S-type stent, the less areas with the lowest wall shear stress and more flow cross-section are observed in the expanded stenotic artery for the N-type stent, which suggests that the risk of arterial restenosis is lower for the N-type stent.

Key words: curved vascular; intravascular stent; shear-thinning; arterial injury