Related Experiment Video
Updated: Jun 19, 2026
09:45
Amplitude-Modulated Electrodeformation to Evaluate Mechanical Fatigue of Biological Cells
Published on: October 13, 2023
Fatigue-life assessment and validation techniques for metallic vascular implants
1Exponent, Inc., 149 Commonwealth Drive, Menlo Park, CA 94025, USA. bjames@exponent.com
Biomaterials
|October 31, 2009
Summary
Vascular implants face significant fatigue from millions of yearly cycles. This paper reviews methods for assessing implant fatigue performance, crucial for preventing mechanical failure and ensuring device longevity.
Area of Science:
- Biomaterials Science
- Mechanical Engineering
- Medical Device Design
Background:
- Vascular implants (e.g., cardiac valve prostheses, stents) endure complex in vivo loading conditions.
- Pulsatile loading alone generates ~40 million cycles annually, necessitating robust fatigue assessment.
- Mechanical failure of these devices carries severe clinical consequences.
Purpose of the Study:
- To explore the merits and shortcomings of historical fatigue life assessment approaches for endovascular implants.
- To provide recommendations for optimizing the fatigue-life validation of endovascular implants.
Main Methods:
- Review of established fatigue life assessment methodologies.
- Analysis of durability testing, stress/strain-life analysis, and damage tolerance-based analysis.
- Evaluation of the strengths and weaknesses of each approach in the context of vascular implant design.
Main Results:
- Each fatigue assessment method presents unique advantages and limitations.
- No single method universally addresses all aspects of vascular implant fatigue.
- A comprehensive approach integrating multiple assessment strategies is often required.
Conclusions:
- Effective fatigue-life validation is critical for the safe and reliable performance of vascular implants.
- Understanding the nuances of different assessment techniques informs better device design and validation protocols.
- Recommendations are provided to guide designers in selecting and applying appropriate fatigue assessment strategies.
Related Concept Videos
01:21Fatigue
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
01:22Fatigue Strength of Concrete
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...