在三级负荷条件下,下肢静脉支架的疲劳强度和寿命预测
Haiquan Feng1, Jinming Hu1, Guanyu Wang2
1College of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot, P. R. China.
Computer methods in biomechanics and biomedical engineering
|August 21, 2023
概括
复杂的负载条件可能导致下肢动脉支架疲劳失败. 最初的裂显著影响支架疲劳寿命,而不是加载类型,APsolute Pro显示寿命最长,E-luminexx-B显示寿命最短.
科学领域:
- 生物医学工程 生物医学工程
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
背景情况:
- 下肢动脉支架对于治疗血管疾病至关重要.
- 植入后复杂的负载条件可能导致支架疲劳失败,可能导致炎症和复缩.
研究的目的:
- 调查多轴负荷对五种不同的下肢动脉支架疲劳性能的影响.
- 在各种复杂的负载场景下预测支架疲劳寿命.
主要方法:
- 用有限元法 (FEM) 分析对五种支架模型进行了分析:APsolute Pro,Complete SE,Protégé EverFlex,Pulsar-35和E-luminexx-B.
- 疲劳强度在压力-曲-扭曲和压缩-曲-扭曲负载条件下确定.
- 骨折力学被用来分析初始裂类型对疲劳失败的影响.
主要成果:
- 根据名义应力方法,张力曲扭转负荷对支架疲劳寿命的影响比压力曲扭转负荷更大.
- 最初的裂和外部负荷都会导致支架疲劳骨折,最初的裂具有更重要的影响.
- 在相同的负载条件下,APsolute Pro支架具有最长的疲劳寿命,而E-luminexx-B支架在相同的负载条件下具有最短的寿命.
结论:
- 最初的支架裂是疲劳失败的一个更关键因素,而不是施加的负载的性质.
- 在复杂负荷下了解支架疲劳机制对于优化支架设计和临床选择至关重要.
- 结果为改善支架结构完整性和患者结果提供了洞察力.
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