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A biodegradable magnesium alloy vascular stent structure: Design, optimisation and evaluation.
Yafei Li1, Yan Wang1, Zhenquan Shen2
1School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.
Acta Biomaterialia
|January 27, 2022
Summary
A novel biodegradable magnesium alloy stent design enhances support and reduces stress concentration. This improved stent structure offers better plastic deformation, expansion, and compression resistance for medical applications.
Area of Science:
- Biomaterials Engineering
- Medical Device Design
Background:
- Biodegradable magnesium alloy stents (BMgS) face challenges with insufficient support and stress-related fractures.
- Optimizing BMgS structural design is crucial for clinical success.
Purpose of the Study:
- To develop and analyze a novel BMgS structural design with improved mechanical properties.
- To investigate the impact of bending radius (r) and ring length (L) on stent performance.
Main Methods:
- Finite element analysis (FEA) and non-dominated sorting genetic algorithm II (NSGA-II) for structural optimization.
- In vitro mechanical testing including balloon inflation, radial strength, and flexibility assessments.
Main Results:
- The optimized stent design significantly improved plastic deformation and expansion capabilities.
- Reduced ring length (L) enhanced compression resistance, while bending radius (r) improved expansion.
- Optimized stent exhibited a 40% increase in radial strength and halved circumferential residual stress compared to traditional designs.
Conclusions:
- The novel stent structural design effectively addresses limitations of existing BMgS.
- FEA and experimental validation confirm the enhanced mechanical performance and reduced stress concentration of the optimized stent.
