Computational modeling of cardiovascular stent struts configuration and influences on NiTi stent shape memory behavior

This study investigates the effects of geometrical parameters and stent strut configuration on the shape memory behavior of nickel-titanium shape memory alloy (SMA) wire stents. 3 nitinol stents were evaluated based on 5 geometrical parameters, including the stent length, the number of stent meanders, the inside diameter of the stent, the wire diameter, and the stent struts angle using the finite element method, and 14 parameters specific to the nitinol shape memory alloy were assigned to all stents. Decreasing the number of stents meanders caused better shape memory behavior, chronic outward force (COF), radial resistive force (RRF), and hysteresis. On the other hand, changing the stent strut configuration and increasing the stent strut angle also had the greatest effect on improving the shape memory behavior of the stent, so the increase in the RRF and the increase in the amount of crimping showed a different behavior of this stent.

Computational modeling of cardiovascular stent struts configuration and influences on NiTi stent shape memory behavior Keywords:

Finite element analysis , Shape memory alloy , chronic outward force , radial resistive force