Author(s): SONG Chengli, GUO Jingzhen, CUI Haipo, Shanghai Institute for Minimally Invasive Therapy, School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology
Pages: 20108-20111
Year: 2015 Issue:  20
Journal: Journal of Functional Materials
Keyword:  drug eluting stent(DES); stress distribution; fatigue strength; safety factor;
Abstract: After the implantation,the fatigue performance of the drug eluting stent has significant influence on the success of coronary stent implantation.The finite element method was used to analyse the stress distribution of the stent during the process of using,and the fatigue strengh was analysed according to the Goodman curve.The security of the stent was described by the safety factor.It could be found from the analysis that the high-stress area always located in the arc parts during the deformation process.However,all the feature points of the two kinds of stents located under the fatigue limit line.So the failure by fatigue of the stents will not happen during the using process.Moreover,there was a negative correlation between the safety factor of the stent and the length,width,and thickness,respectively.The results prove that the fatigue strength of the stent can be analysed successfully through the finite element method,which provides the reference for the stent design.