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Mechanical behavior of a vein pouch saccular aneurysm model
A D Shah1, N Naff, J D Humphrey
1Department of Mechanical Engineering, University of Maryland, Baltimore, USA.
Neurological Research
|September 24, 1999
Summary
Canine vein pouch models exhibit high extensibility at low pressures but stiffen significantly, failing to accurately mimic human aneurysm mechanical behavior for clinical studies.
Area of Science:
- Biomedical Engineering
- Vascular Surgery
- Biomaterials Science
Background:
- Intracranial saccular aneurysms are complex lesions whose mechanical properties are crucial for understanding their response to physiological loads and interventions.
- Current animal models for aneurysm research often lack detailed mechanical characterization, limiting their clinical relevance.
- Evaluating the mechanical behavior of existing animal models is essential for developing better research tools.
Purpose of the Study:
- To compare the multiaxial mechanical behavior of a canine vein pouch model with published data on human aneurysms and native veins.
- To assess the suitability of the canine vein pouch model for studying aneurysm mechanics.
Main Methods:
- Surgical creation of nine canine vein pouch models using external jugular vein segments.
- Cyclic inflation testing of harvested vein pouches one week post-surgery.
- Analysis of pressure-regional strain data to characterize mechanical properties.
Main Results:
- Canine vein pouch aneurysms demonstrated significant extensibility up to 30 mmHg, particularly in the axial direction.
- The lesions became considerably stiffer at higher pressures.
- No ruptures occurred in vivo or during the inflation tests.
- The mechanical behavior did not closely replicate that of human aneurysms.
Conclusions:
- The canine vein pouch model, one week post-surgery, does not adequately mimic the mechanical behavior of human intracranial aneurysms.
- Modifications to this model or the development of alternative models are necessary for clinically relevant research on aneurysm growth, rupture, and treatment.