Vascular stents are used to dilate arteries that are narrowed or clogged by plaque. However, in-stent restenosis is still one of the major causes of the clinical failure; whether bare-metal stent (BMS) or drug-eluting stent (DES). It is believed that vessel trauma imposed during stent deployment is closely correlated to the so called in-stent restenosis. The interaction between the stent-strut and the artery during stent implantation is crucial for possible artery damage. However, the expansion behavior of stent is largely determined by the mechanical performance of the stent.
It is difficult to measure in vivo or clinically for the interactions of stent and artery, and reported results are very limited. A numerical approach that leverages on computing power can provide new insights into the stent implantation process. In this study, the stent behavior under both expansion and bending were investigated for the proposed stent design. Areas in the vessels with high stress concentrations were identified as these were weaknesses that might have a high possibility of vascular injury. Virtual stent implantation trials were simulated and the phenomena of stent recoil, dogboning and foreshortening were observed and examined.