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目的应用计算流体力学软件进行三维数值模拟,分析不同类型动脉瘤的血液动力学特性。方法根据动脉瘤瘤体与载瘤动脉的关系,将颅内典型囊性动脉瘤分为A(动脉瘤位于血管弓背侧)、B(动脉瘤位于血管弓内侧)、C(分叉部动脉瘤,瘤轴平面与载瘤动脉轴共面),D(分叉部动脉瘤,瘤轴平面与载瘤动脉轴不共面)四类。联合应用Matlab软件、Ansys软件、Fluent软件及自写程序对颅内囊性动脉瘤进行计算机数值模拟分析。结果颅内动脉瘤模型流入道的血流速度、动压及壁面切应力最高,流出道次之,顶部最低;A、B、D类动脉瘤冲击域壁面切应力最大;C类动脉瘤内动脉压普遍较高。结论对A、B、D类动脉瘤,冲击域壁面切应力最大可能是动脉瘤生长的主要因素,而其顶部壁面切应力不足可能是破裂的主要因素之一;对C类动脉瘤,动脉瘤内动压较高是其破裂的主要因素。
Objective To calculate the hemodynamic characteristics of different types of aneurysms by using computational fluid dynamics software for three-dimensional numerical simulation. Methods According to the relationship between aneurysm tumor and parent artery, the intracranial typical aneurysm was divided into A (aneurysm located on the dorsal side of vessel), B (aneurysm located inside the vessel arch), C (bifurcation artery Tumor, tumor plane axis and the axis of the host artery co-axial), D (bifurcation aneurysm, tumor axis plane and the parent artery axis is not coplanar) four categories. Combined with Matlab software, Ansys software, Fluent software and self-write program for computer-aided numerical simulation of intracranial cystic aneurysms. Results The intracranial aneurysm model had the highest flow velocity, dynamic pressure and wall shear stress, the lowest flow velocity and the lowest peak in the intracranial aneurysm model. The wall shear stress of the A, B, Pressure is generally higher. Conclusions The maximum wall shear stress of A, B and D aneurysms in the impact domain may be the main factor for the aneurysm growth. The lack of shear stress at the top wall may be one of the major causes of rupture. For C-type aneurysms, aneurysms The higher dynamic pressure is the main factor of its rupture.