Simulation of Treatment for Aortic Arch Aneurysms With Half Implanted Stent
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摘要: 针对顶部附带局部突起的主动脉弓动脉瘤,提出了一种半桥支架治疗方法.为展示动脉瘤附近的详细流动情形和压力、壁面切应力分布,检验半桥支架是否具有可以促进瘤腔内血栓、闭锁形成的血流动力学特征,构建了无支架和半桥支架治疗带局部突起的主动脉弓动脉瘤模型.利用计算流体力学的方法对2个模型中的生理性血液流动进行了仿真,并对血流动力学进行了比较和分析.仿真结果表明:半桥支架模型瘤腔内的流动受到明显抑制,特别是局部突起处的压力和壁面切应力大大地减小了,因此,半桥支架可以促进瘤腔内血栓的形成,并能减小动脉瘤破裂的危险,是一种可行的支架治疗动脉瘤的方法.Abstract: A novel approach was proposed employing half implanted stent for the treatment of aortic arch aneurysm harboring a bleb on its dome. The objectives of the study were to construct a nonstented and a half stented aortic arch aneurysm models with blebs, demonstrate the detailed flow patterns, pressure and wall shear stress distributions around the aneurysm, and examine whether half stented aneurysms have preferable intra-aneurysmal hemodynamics for thrombus and occlusion. The physiologic blood flows around the aortic arch aneurysms were simulated using the method of computational fluid dynamics. The detailed hemodynamics in both models were compared and analyzed. Flow activities inside the half stented aneurysm model were significantly diminished, specifically the pressures and wall shear stresses in the bleb were decreased. It can be concluded that half bridged endovascular stents can promote intra-aneurysmal thrombus development and attenuate aneurysm rupture risk, and it is a feasible approach to treat aortic arch aneurysm.
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Keywords:
- implants /
- hemodynamics /
- cardiovascular surgery /
- biomechanics
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