An Investigation on Strength of SS316L and Cobalt- Chromium used as cardio Vascular Stent materials by nonlinear FEA


Aim of this study is to provide a computational approach for evaluating the effect of Stents on biomechanical outcome of deployment of stent in different condition. Nonlinear FEA software has been used successfully on balloon expandable stents. Projects often require modelling systems that consist of multiple components with nonlinear materials, complex 3D geometries. The ABACUS, handles the full range of nonlinear material properties for the stent, the catheter balloon, and the artery wall. The objective of research carried out was to simulate the mechanical behaviour of the stent using finite element analysis. Implantation and in vivo loading are considered. Finite element analysis provides a quick and cost-effective method for evaluating stent performance, yielding accurate information about the expanded geometry and the stress and strain deformation fields with in the stent for various loading conditions. With appropriate applied internal pressure, the balloon inside the stent is deployed which linearlyexpands the diameter of a Modular Stent until it reaches 1.7 times of its original diameter. The results will assist in the development of novel stent designs and stent deployment to minimize vascular injury during stenting and reduce restenosis. The results obtained for the selected stent material are compared. The Cobalt-chromium undergone plastic deformation at 0.44 MPa and SS316L at 0.3 MPa pressure load

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