Journal
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Volume 115, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmbbm.2020.104305
Keywords
Nitinol; Wire braided stent; Covered stent; Finite element analysis (FEA)
Funding
- Irish Research Council [GOIPG/2017/2096]
- National University of Ireland Galway Hardiman scholarship
- DJEI/DES/SFI/HEA Irish Centre for High-End Computing (ICHEC)
- Irish Research Council (IRC) [GOIPG/2017/2096] Funding Source: Irish Research Council (IRC)
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A computational framework was developed in this study to predict the functional performance of self-expanding wire braided stents, with braid angle identified as a key governing parameter for stent performance. The addition of a polymeric cover was found to cause a stiffer radial response for the wire braided stents.
Self-expanding covered braided stents are routinely used across a diverse range of clinical applications, but few computational studies have attempted to replicate their complex behaviour. In this study, a computational framework was developed to predict the functional performance of bare and covered self-expanding wire braided stents, with a systematic evaluation on the effect of various braid and cover parameters presented. Simulated radial force and kink deformation tests show good agreement to experimental data for covered braided stents across a range of braid angles and cover thicknesses. Our results demonstrate that braid angle is a key governing parameter that dictates the radial and kink performance of both bare-metal and covered wire braided stents. It was also demonstrated that addition of a polymeric cover to a wire braided stent causes a stiffer radial response across all braid angles, particularly when thicker and/or stiffer covering systems were considered. This study represents the first experimentally-validated computational model for covered wire braided stent systems and has excellent potential to be used in future design of these devices for a range of applications.
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