Bulg. J. Phys. vol.44 no.2 (2017), pp. 155-161

A Study of the Mechanical Properties of a Real Coronary Stent — Dynamical Behaviour of an Optimal Stent

E. Naydenova1, L. Vladimirova-Mihaleva2, M. Mihalev3
1St. Kliment Ohsridski University of Sofia, Faculty of Mathematics and Informatics, 5 James Bouchier Blvd. 1164 Sofia, Bulgaria
2St. Kliment Ohsridski University of Sofia, Faculty of Physics, 5 James Bouchier Blvd. 1164 Sofia, Bulgaria
3Technical University of Sofia, Faculty of Mechanical Engineering, 8 Kl. Ohridski Blvd., 1000 Sofia, Bulgaria
Abstract. Due to different reasons the coronary stent become more and more popularity. There are different type of stents in the construction and inaterials. For the reliability of a stent the mechanical behaviour is of exclusive importance. The experimentally estimation of this behaviour is often impossible due to the expensive tests and need of specialized apparatus. As an international standard for releasing a stent into production the "Guidance for Industry and FDA Stuff – Non-clinical Engineering Tests and Recommended Labeling for Intravaskular Stents and Associated Delivery Systems" is accepted. In this work we show a Finite Element pre-clinical simulation of mechanical properties of the stent during expanding of the stent and following relaxation using the COMSOL software. The most important properties of a real stent, which is under review for admission are predicted: diameter of the stent, recoil, dogboning, critical stresses. These parameters are in conformation with other stents. The construction show ever better parameters in comparison with classical Palmaz-Scatz types.

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