Simulation of long-term fatigue damage in bioprosthetic heart valves: effects of leaflet and stent elastic properties

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• 作者：Caitlin Martin (1)
  Wei Sun (1) (2)
  
• 关键词：Bioprosthetic heart valve durability ; Soft tissue fatigue ; Finite element analysis
• 刊名：Biomechanics and Modeling in Mechanobiology
• 出版年：2014
• 出版时间：August 2014
• 年：2014
• 卷：13
• 期：4
• 页码：759-770
• 全文大小：4,013 KB
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• 作者单位：Caitlin Martin (1)
  Wei Sun (1) (2)
  
  1. Tissue Mechanics Laboratory, Biomedical Engineering Program and Mechanical Engineering Department, University of Connecticut, Storrs, CT, 06269, USA
  2. The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Technology Enterprise Park, Room 206, 387 Technology Circle, Atlanta, GA, 30313-2412, USA
  
• ISSN：1617-7940

文摘

One of the major failure modes of bioprosthetic heart valves (BHVs) is noncalcific structural deterioration due to fatigue of the tissue leaflets; yet, the mechanisms of fatigue are not well understood. BHV durability is primarily assessed based on visual inspection of the leaflets following accelerated wear testing. In this study, we developed a computational framework to simulate BHV leaflet fatigue, which is both efficient and quantitative, making it an attractive alternative to traditional accelerated wear testing. We utilize a phenomenological soft tissue fatigue damage model developed previously to describe the stress softening and permanent set of the glutaraldehyde-treated bovine pericardium leaflets in BHVs subjected to cyclic loading. A parametric study was conducted to determine the effects of altered leaflet and stent elastic properties on the fatigue of the leaflets. The simulation results show that heterogeneity of the leaflet elastic properties, poor leaflet coaptation, and little stent-tip deflection may accelerate leaflet fatigue, which agrees with clinical findings. Therefore, the developed framework may be an invaluable tool for evaluating leaflet durability in new tissue valve designs, including traditional BHVs as well as new transcatheter valves.