A finite element analysis of the performance of stents for angioplasty using the hydroforming process
Document typeConference report
Rights accessOpen Access
Nowadays, stent implantation is the most used procedure to treat restenosis of coronary arteries. To prevent restenosis, a stent must absorb a large amount of plastic strain energy during its expansion to avoid the re-closure of artery wall after the implantatioon. According to this design criterion, it was applied the topological optimization technique to provide the best layout of a u nit o r c ell t o b e u sed i n t he formation of the tubular structure of a stent. Subsequently, the topologically optimized stent cell was employed to create the three dimensional stent structure using the software Autocad/Mechanical Desktop® for the generation and treatment of this model. To test this model it was applied the software Stampack® of explicit finite elements to simulate and analyse the expansion process of optimized stent during the angioplasty by hydroforming. Although the hydroforming has been extensively employed in forming process of tubes used in the automotive industry, it was used in this work to study mechanical behavior of stents during the angioplasty. From the simulation by finite elements, it was possible to predict some design parameters of this novel optimized stent model, such as, the pressure of expansion to be applied in the balloon and the plastic strain field of the stent structure after the implant.
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