Abstract
To evaluate the influence of deployment strategy on the mechanical interaction between braided stent and parent artery of intracranial aneurysm (the elasticity of the arterial wall is considered), finite-element analyses are carried out by referring to computational models of flow-diverter device and arterial wall. Two implantation strategies are used to virtually implant the braided stent into the ideal intracranial aneurysm model. One is the noncompacted implantation method, and the other is the implantation method of using push-pull technique. During the process of the implantation, the changes of the arterial shape around the aneurysm and the changes of the wall pressure at the contact area between the braided stent and the inner wall of the artery are analyzed. The results indicate that the average contact pressure in the area of low porosity is 57 mmHg using the push-pull technique, and the average contact pressure of the parent artery is 10.45 mmHg using the non-push-pull technique. The diameter of the parent artery at the aneurismal orifice increased about 0.2 mm when using the push-pull technique, so the elasticity of the vessel should be considered in the mechanical analysis of interaction between stent and vessel.
Highlights
An intracranial aneurysm is a pathological dilatation of the cerebral artery wall
Braided stents with low porosity placed in the orifice of an aneurysm act as a physical barrier which can effectively reduce blood flow velocity in the aneurismal cavity, promote thrombosis formation, and achieve the treatment of cerebral aneurysm
Previous studies [9, 10] have proven that the geometry of the stent in its deployed state plays a major role in the way the blood flow in the aneurismal cavity is diverted
Summary
An intracranial aneurysm is a pathological dilatation of the cerebral artery wall. This pathology is characterized by the unilateral or circumferential dilatation of the vessel lumen. Geometrical projection method is time-saving and easy to use, making it easy for clinicians to judge the treatment outcome quickly. This method does not take into account the interaction between the stent and the vessel and the shape change of the stent and vessel caused by this interaction. Ma et al use finite element method (FEM) to deploy braided stent into intracranial parent artery [11, 12]. Their method simulates the entire process of diverter device into parent artery and takes into account the interaction between the stent and the vessel.
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