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Stress and strain distribution in expanded coronary stents depending on applied material

Idziak-Jabłońska A.

Journal of Applied Mathematics and Computational Mechanics

2015

Vol. 14, nr 2

21--30

The aim of the study is to present mechanical characteristics of coronary stents. More specifically, stress and plastic strain present in a stent were determined depending on the pressure applied to the internal surface of the stent. The study analyses a model of a slotted-tube stent using the finite element method. The stents with two different numbers of segments and with three wall thicknesses were dealt with. The analysis was carried out for the three most popular biomaterials: austenitic steel Cr-Ni-Mo, cobalt-matrix alloy Co-Cr-W-Ni and titanium-matrix alloy Ti-6Al-7Nb. Numerical analysis presented in the study provides a basis for further research and optimization of stent design. The calculations obtained in the study show that the lowest values of maximum reduced stress occur in the stent made of Cr-Ni-Mo. Furthermore, the stent made of Ti-6Al-7Nb exhibited the lowest values of plastic strain.