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Mechanical modeling of self-expandable stent fabricated using braiding technology
Ju Hyun Kim1, Tae Jin Kang, Woong-Ryeol Yu
1Intelligent Textile System Research Center, Department of Materials Science and Engineering, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul 151-742, Republic of Korea.
Journal of Biomechanics
|September 23, 2008
Summary
This study developed a mechanical model to predict the behavior of self-expandable braided stents. The model accurately captures stent hysteresis, crucial for arterial deployment.
Area of Science:
- Biomedical Engineering
- Materials Science
Background:
- Stent mechanical behavior is critical for effective arterial deployment.
- Self-expandable stents fabricated using braiding technology require accurate mechanical modeling for design.
Purpose of the Study:
- To develop and validate a finite element mechanical model for self-expandable braided stents.
- To incorporate superelastic material properties of Nitinol wires into the model.
- To predict the complex mechanical behavior, including hysteresis, of braided stents.
Main Methods:
- Developed a finite element model with a preprocessing program for 3D geometrical modeling of stent braiding.
- Utilized a user material subroutine (VUMAT in ABAQUS) to implement a 1D superelastic model for Nitinol wires.
- Manufactured and mechanically characterized braided stents under compression to validate the model.
Main Results:
- The finite element model accurately predicted the mechanical behavior of braided stents.
- Observed and modeled hysteretic behavior during loading and unloading of braided stents.
- Identified wire slippage and superelasticity as causes of hysteresis.
Conclusions:
- The developed mechanical model effectively predicts the behavior of self-expandable braided stents.
- The model's ability to capture hysteresis is vital for optimizing stent design for arterial applications.
- Understanding hysteresis is key to improving stent performance and safety.
