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Nitinol stent design - understanding axial buckling.
D J McGrath1, B O Brien1, M Bruzzi1
1Biomechanics Research Centre (BMEC), Biomedical Engineering, College of Engineering and Informatics, NUI Galway, Ireland.
Journal of the Mechanical Behavior of Biomedical Materials
|September 26, 2014
Summary
This study investigated nitinol stent buckling during crimping. Reducing transitional material in stent hinges significantly increases nitinol stent stability and prevents buckling.
Area of Science:
- Biomedical Engineering
- Materials Science
Background:
- Nitinol's superelasticity enables self-expanding stents but its nonlinear properties can cause buckling.
- Stent buckling during crimping is a critical failure mode affecting device performance.
Purpose of the Study:
- Investigate axial buckling in a prototype tracheobronchial nitinol stent during crimping.
- Identify design modifications to eliminate stent buckling.
Main Methods:
- Simulated a radial force test using a computational model with introduced geometric defects to induce buckling.
- Performed a sensitivity study on the nitinol loading curve's transitional plateau region's effect on stent stability.
Main Results:
- The transitional plateau region of the nitinol loading curve significantly impacts stent stability during crimping.
- Reducing transitional material in stent hinges increases nitinol stent stability.
Conclusions:
- The transitional plateau region is a key factor in nitinol stent buckling.
- Modifying stent hinge design to reduce transitional material effectively enhances stent stability and prevents buckling.
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