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Twist buckling behavior of arteries
Justin R Garcia1, Shawn D Lamm, Hai-Chao Han
1Department of Mechanical Engineering, Biomedical Engineering Program, University of Texas at San Antonio, UTSA-UTHSCSA, San Antonio, TX, 78249, USA.
Biomechanics and Modeling in Mechanobiology
|November 20, 2012
Summary
Arteries subjected to twisting can buckle, forming kinks. Axial stretch significantly impacts buckling torque and twist angle, while lumen pressure affects torque but not twist angle.
Area of Science:
- Biomedical Engineering
- Biomechanics
- Vascular Biology
Background:
- Arteries experience torsion from physiological movements and surgical interventions.
- Understanding arterial stability under torsion is crucial for maintaining patency.
- The mechanical behavior of arteries under twisting loads is not well-understood.
Purpose of the Study:
- To experimentally investigate arterial buckling under torsion.
- To determine critical buckling torque, twist angle, and shape.
- To gain insight into the mechanical instability of blood vessels.
Main Methods:
- In vitro torsion testing of porcine common carotid arteries.
- Application of constant axial stretch ratios (1.1-1.7) and lumen pressures (20-100 mmHg).
- Measurement of torque and twist angle until buckling (kinking) occurred.
Main Results:
- Axial stretch ratio significantly influenced critical buckling torque and twist angle.
- Lumen pressure significantly affected critical buckling torque but not critical twist angle.
- Arteries snapped into a kinked shape upon buckling.
Conclusions:
- Arterial buckling behavior under torsion is elucidated.
- Critical buckling parameters are dependent on axial stretch and lumen pressure.
- This study provides novel insights into the mechanical instability of arteries.
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