Finite element simulation and testing of cobalt-chromium stent: a parametric study on radial strength, recoil, foreshortening, and dogboning

Abstract

The effectiveness of cardiovascular stenting procedure depends on the crimping and expansion characteristics of a stent, influenced by its design parameters. In this study, CoCr stents are fabricated, crimped on a tri-folded balloon, and expanded using manual inflation device. Similarly, in the finite element model, a tri-folded balloon is used to expand the stent. The length and diameter are measured to evaluate the radial strength, recoil, foreshortening, and dogboning. The simulation and experimental results match satisfactorily. The validated FE model can be used with confidence to optimize future stent designs, thus reducing the number of testing and product development time.

Keywords:

• Cardiovascular stent design
• FEM
• radial strength
• foreshortening
• dogboning

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The study is supported by a generous grant of MHRD (Ministry of Human Resource Development) and ICMR (Indian Council of Medical Research) under the IMPRINT (Impacting Research Innovation and Technology) program (Project# 4129) of Government of India. The authors thank IIT-Delhi HPC facility for computational resources and CRF-IIT Delhi (Central Research Facility) for femtosecond laser cutting of stents.