An FEA method to study flexibility of expanded coronary stents

Abstract The purpose of this paper is to show how finite element analysis can be used to research flexibility of expanded stainless steel coronary stents. With multipoint constraint elements (MPC), uniform bending moment was applied to a unit model of a commercial tubular stent. Bending stiffness was measured as 16.8 and 1.1 N mm 2  rad −1 for elastic and plastic deformation, respectively. Furthermore, a complete model of the same stent was bent under multiple moment loadings to test the general application of the method and the result accorded with the expectation. In conclusion, this finite element analysis (FEA) bending method can be used to study and compare flexibility of different stents, and provides a convenient tool for designers to pretest and improve bending characteristics of new stents.

[1]  F. Etave,et al.  Mechanical properties of coronary stents determined by using finite element analysis. , 2001, Journal of biomechanics.

[2]  Takashi Saito,et al.  Effects of Stent Structure on Stent Flexibility Measurements , 2005, Annals of Biomedical Engineering.

[3]  Weiqiang Wang,et al.  Analysis of the transient expansion behavior and design optimization of coronary stents by finite element method. , 2006, Journal of biomechanics.

[4]  Régis Rieu,et al.  Assessment of the trackability, flexibility, and conformability of coronary stents: A comparative analysis , 2003, Catheterization and cardiovascular interventions : official journal of the Society for Cardiac Angiography & Interventions.

[5]  D Glogar,et al.  Longitudinal straightening effect of stents is an additional predictor for major adverse cardiac events. Austrian Wiktor Stent Study Group and European Paragon Stent Investigators. , 2000, Journal of the American College of Cardiology.

[6]  C Dumoulin,et al.  Mechanical behaviour modelling of balloon-expandable stents. , 2000, Journal of biomechanics.

[7]  Lorenza Petrini,et al.  Numerical investigation of the intravascular coronary stent flexibility. , 2004, Journal of biomechanics.

[8]  C. Jost,et al.  Stenting in Europe, what lessons can we learn? Development of a stent classification system based on a survey of European clinical experiences. , 1998, Catheterization and cardiovascular diagnosis.

[9]  Antonio Colombo,et al.  Selection of coronary stents. , 2002, Journal of the American College of Cardiology.

[10]  J. Ormiston,et al.  Stent longitudinal flexibility: A comparison of 13 stent designs before and after balloon expansion , 2000, Catheterization and cardiovascular interventions : official journal of the Society for Cardiac Angiography & Interventions.