Application of in silico Platform for the Development and Optimization of Fully Bioresorbable Vascular Scaffold Designs

• Published in: Frontiers in medical technology Vol. 3; p. 724062
• Main Authors: Milosevic, Miljan, Anic, Milos, Nikolic, Dalibor, Geroski, Vladimir, Milicevic, Bogdan, Kojic, Milos, Filipovic, Nenad
• Format: Journal Article
• Language: English
• Published: Switzerland Frontiers Media S.A 14.10.2021
• Subjects: bioresorbable PLLA stent; design and optimization; finite element analysis; in vitro mechanical test; Medical Technology; vascular scaffold; design and optimization; bioresorbable PLLA stent; vascular scaffold; finite element analysis; in vitro mechanical test
• ISSN: 2673-3129; 2673-3129
• DOI: 10.3389/fmedt.2021.724062

Bioresorbable vascular scaffolds (BVS), made either from polymers or from metals, are promising materials for treating coronary artery disease through the processes of percutaneous transluminal coronary angioplasty. Despite the opinion that bioresorbable polymers are more promising for coronary stents, their long-term advantages over metallic alloys have not yet been demonstrated. The development of new polymer-based BVS or optimization of the existing ones requires engineers to perform many very expensive mechanical tests to identify optimal structural geometry and material characteristics. mechanical testing opens the possibility for a fast and low-cost process of analysis of all the mechanical characteristics and also provides the possibility to compare two or more competing designs. In this study, we used a recently introduced material model of poly-l-lactic acid (PLLA) fully bioresorbable vascular scaffold and recently empowered numerical InSilc platform to perform mechanicals tests of two different stent designs with different material and geometrical characteristics. The result of inflation, radial compression, three-point bending, and two-plate crush tests shows that numerical procedures with true experimental constitutive relationships could provide reliable conclusions and a significant contribution to the optimization and design of bioresorbable polymer-based stents.