Key result
A simulated new center-unsheathing delivery system reduced dog-boning and area stenosis ratio, while ferrous alloy stents provided larger expansion but higher vessel stress than Ni-Ti stents.
Why the study?
Does a new center-unsheathing delivery system and ferrous alloy material improve stent expansion and reduce vessel stress in a computational model of carotid artery stenting?
Does a new center-unsheathing delivery system and ferrous alloy material improve stent expansion and reduce vessel stress in a computational model of carotid artery stenting?
A novel center-unsheathing delivery system for self-expanding stents may reduce dog-boning and distal vessel stress, potentially lowering the risk of vascular injury during carotid stenting.
In this research, effects of material properties of stent materials, such as nitinol and ferrous alloy, on a self-expanding stent are studied by the stent deployment simulations using finite element method (FEM). Stent, vessel, and plaque are modeled by using AutoCAD. The model is imported to a finite element analysis software Ansys 15.0 and the deployment analysis of the stent is carried out. In addition, two methods of the unsheathing of the self-expanding stent are studied: (1) a conventional method where a stent comes out from one end of the sheath and (2) a new method in which a stent comes out from the center of the sheath. Also, both the area stenosis ratio and Dog-Boning are discussed referring the simulations conducted in the paper.
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SASAKI et al. (2018) studied Carotid artery stenosis (simulated). Ferrous alloy stent and new delivery system vs. Ni-Ti alloy stent and conventional delivery system was evaluated on Simulated radial displacement, von Mises stress, area stenosis ratio, and dog-boning. A simulated new center-unsheathing delivery system reduced dog-boning and area stenosis ratio, while ferrous alloy stents provided larger expansion but higher vessel stress than Ni-Ti stents.
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