Improvement of mechanical performance of bioresorbable magnesium alloy coronary artery stents through stent pattern redesign

Improvement of mechanical performance of bioresorbable magnesium alloy coronary artery stents through stent pattern redesign

Wang, Qian (Tsinghua University)
Fang, Gang (Tsinghua University)
Zhao, Ying Hong (Shanghai Bio-heart Biological Technology Co. Ltd.)
Zhou, J. (TU Delft Biomaterials & Tissue Biomechanics)

2018

Optimized stent pattern design can effectively enhance the mechanical performance of magnesium alloy stents by adjusting strain distribution and evolution during stent deformation, thereby overcoming the limitations imposed by the intrinsic mechanical properties of magnesium alloys. In the present study, a new stent design pattern for magnesium alloys was proposed and compared to two existing stent design patterns. Measures of the mechanical performance of these three stents, including crimping and expanding deformability, radial scaffolding capacity, radial recoil and bending flexibility, were determined. Three-dimensional finite element (FE) models were built to predict the mechanical performance of the stents with the three design patterns and to assist in understanding the experimental results. The results showed that, overall, the stent with the new design pattern was superior to the stents based on the existing designs, though the expanding capacity of the newly designed stent still needed to be improved.

Bioresorbable stent
Deformation behavior
Finite element analysis
Magnesium
Mechanical property

http://resolver.tudelft.nl/uuid:86266ed1-b6db-4f87-8f6f-e89fdb90df7b

https://doi.org/10.3390/app8122461

Applied Sciences, 8 (12)

Institutional Repository

journal article

© 2018 Qian Wang, Gang Fang, Ying Hong Zhao, J. Zhou