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Anatomically shaped internal carotid artery aneurysm in vitro model for flow analysis to evaluate stent effect
Krisztina Baráth1, Francis Cassot, Daniel A Rüfenacht
1Department of Radiology, University Hospital of Geneva, Rue Micheli-du-Crest 24, CH-1211 Geneva 14, Switzerland.
AJNR. American Journal of Neuroradiology
|December 1, 2004
Summary
This study demonstrates the feasibility of using an in vitro elastic model to evaluate blood flow dynamics in cerebral aneurysms before and after stent implantation. The results show that stent placement alters flow patterns, potentially aiding aneurysm exclusion.
Area of Science:
- Biomedical Engineering
- Medical Device Technology
- Fluid Dynamics
Background:
- Cerebral aneurysm treatment often requires more than stent implantation alone.
- Further research is needed to optimize treatment outcomes.
- In vitro models offer a platform for experimental investigation.
Purpose of the Study:
- To demonstrate the feasibility of an in vitro elastic model for evaluating cerebral aneurysm hemodynamics.
- To assess flow changes before and after stent implantation.
- To investigate the impact of stents on intra-saccular flow patterns.
Main Methods:
- Anatomically shaped elastic internal carotid artery model with an aneurysm was created.
- A circulatory loop simulated physiological blood flow.
- Laser sheet translumination and particle visualization assessed flow dynamics before and after stent placement.
Main Results:
- Stent implantation significantly altered intra-saccular flow patterns.
- A 32% reduction in vortex velocity was observed post-stenting.
- The stent promoted vortex dispersion and increased residence time within the aneurysm sac.
Conclusions:
- In vitro anatomic elastic models are effective for hemodynamic flow evaluation.
- Stent implantation induces favorable hemodynamic changes in aneurysms.
- These changes may aid in aneurysm exclusion and prevent sac regrowth.