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A steady flow analysis on the stented and non-stented sidewall aneurysm models
1Thermal and Fluids Engineering Division, School of Mechanical and Production Engineering, Nanyang Technological University, Singapore. mcmyu@ntu.edu.sg
Medical Engineering & Physics
|September 1, 1999
Summary
This study investigated blood flow in sidewall aneurysms using Particle Image Velocimetry. Devices like stents and springs effectively reduced internal flow and wall shear stress, aiding thrombosis formation.
Area of Science:
- Biomedical Engineering
- Fluid Dynamics
- Medical Device Technology
Background:
- Sidewall aneurysms present complex blood flow dynamics.
- Understanding these hemodynamics is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the effects of blood flow patterns in sidewall aneurysms.
- To evaluate the efficacy of stents and springs in modifying intra-aneurysmal flow and wall shear stress.
Main Methods:
- In vitro steady flow studies using rigid aneurysm models.
- Particle Image Velocimetry (PIV) employed across a Reynolds number range of 200-1600.
- Analysis of vortex formation, strength, and wall shear stress distribution.
Main Results:
- A single large vortex formed above Re 700, while counter-rotating vortices appeared below Re 700.
- Vortex strength increased with Reynolds number but decreased with larger aneurysm size.
- Stents and springs reduced intra-aneurysmal flow (<5% bulk velocity) and high wall shear stress at the distal neck (by ~90%).
Conclusions:
- Blood flow patterns in aneurysms are dependent on Reynolds number and aneurysm geometry.
- Implanted devices like stents and springs significantly dampen intra-aneurysmal flow.
- These devices show promise for improving stent technology and inducing thrombosis in aneurysm treatment.