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Computational Bench Testing to Evaluate the Short-Term Mechanical Performance of a Polymeric Stent
A C Bobel1, S Petisco2, J R Sarasua3
1Biomechanics Research Centre (BMEC), Biomedical Engineering, College of Engineering and Informatics, NUI Galway, Galway, Ireland. a.bobel1@nuigalway.ie.
Cardiovascular Engineering and Technology
|November 19, 2015
Summary
Finite element analysis (FEA) simulations show that poly-L-lactide-acid (PLLA) biodegradable stents can achieve mechanical performance comparable to metal stents. This computational approach offers a rapid method for evaluating new biodegradable stent designs for cardiovascular applications.
Area of Science:
- Biomaterials Engineering
- Computational Mechanics
- Cardiovascular Devices
Background:
- Biodegradable polymers like poly-L-lactide-acid (PLLA) are explored for cardiovascular stents to overcome limitations of current metal and drug-eluting stents.
- Fully polymeric stents are emerging but lack long-term in vivo mechanical performance data.
- Establishing optimal mechanical properties for polymeric stents is challenging, time-consuming, and expensive.
Purpose of the Study:
- To utilize finite element analysis (FEA) for rapid computational testing of biodegradable PLLA stent mechanical performance.
- To compare the short-term mechanical performance of three common polymeric stent geometries.
- To assess the feasibility of PLLA as a material for effective cardiovascular stents.
Main Methods:
- Non-linear viscous material model applied to PLLA.
- Finite element analysis (FEA) simulations performed on three distinct stent geometries.
- Comparative analysis of simulated mechanical performance against experimental data.
Main Results:
- FEA provided representative data on radial strength, flexibility, and longitudinal resistance for PLLA stents.
- Simulated performance was comparable to conventional permanent metal stents.
- The study confirmed the potential of PLLA to meet essential mechanical requirements for stent applications.
Conclusions:
- FEA is a powerful and efficient tool for evaluating the mechanical characteristics of biodegradable polymeric stents.
- PLLA demonstrates potential for developing effective biodegradable cardiovascular stents with sufficient mechanical properties.
- Computational modeling can accelerate the development and optimization of novel stent designs.
