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| Research on Biomechanics Properties for BalloonExpandable Intracoronary Stents |
| College of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051 China |
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Abstract In this paper we studied the mechanical properties of coronary stents with different connection bars, providing guidance for the design and development of the stent and interventional treatment. Solid Works was used to establish the three stent models with different connection bars which were called W-stent, S-stent, L-stent, crimp shell and balloon model. Hypermesh was used for meshing, ABAQUS was used to simulate their mechanical properties of radial recoil, axial shorting, expansion uniformity, radical bracing stiffness and the flexibility, at the same time verify the rationality of numerical simulation which present measure methods of bracing stiffness and bending stiffness which were based on radical uniform load and “fourpoint bending” measure technology. Results show that the mechanical properties of the three intracoronary stents are within the safe range. By comparing these stents, the biomechanics properties of A-stent are better; the radical bracing stiffness of B-stent is 3.34 N/mm, it so easily leads to injure the vascular wall because of its higher bracing stiffness; the axial shorting of C-stent is 8.25 %, because its axial shorting is larger, it is not conductive to the stent to find the correct position in the vessel; bending stiffness of A-stent and B-stent are as follows: 17.74 N/rad and 18.00 N/rad, their flexibility are larger. It’s proved that the numerical simulation results agree with the in vitro test results.
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