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本文利用边界元方法计算了腹主动脉叉。在动脉粥样硬化前后的血液流场、血管壁切应力等血液流体动力学特性,通过对动脉粥样硬化产生前后,左、右髂总动脉壁切应力的计算结果分析,对粥样斑块病变产生和发展的血液流体动力学原因做出了判断。结果显示:腹主动脉叉几何形状的不对称性导致分叉处血液流速、血管壁切应力分布的不对称,内侧壁切应力大于外侧壁,右髂总动脉内侧壁切应力大于左髂总动脉。动脉粥样硬化处由于血管腔变窄血液流速明显变大、切应力变大,容易使斑块表面撕裂出现组织增生,粥样斑块下游处血流速度、切应力减小,形成血液分离区,使血细胞聚集,造成动脉粥样硬化发展、加剧。
In this paper, a bifurcation of the abdominal aorta was calculated using the boundary element method. In the blood flow field before and after atherosclerosis, vascular wall shear stress and other hemodynamic characteristics, through the atherosclerosis before and after the left and right common iliac artery wall shear stress calculation results analysis of atherosclerotic plaque Pathogenesis and development of the hemodynamics have made judgments. The results showed that the asymmetry of the cross-sectional shape of the aorta caused the asymmetry of the blood flow velocity at the bifurcation and the shear stress distribution of the vascular wall. The shear stress of the medial wall was greater than that of the lateral wall. The shear stress of the medial wall of the right common iliac artery was greater than that of the left common iliac artery . Atherosclerosis due to vascular lumen narrowing blood flow was significantly larger, shear stress becomes larger, prone to tearing plaque surface tissue proliferation, atherosclerosis downstream of blood flow velocity, shear stress decreases, the formation of blood separation District, the blood cells gathered, resulting in the development of atherosclerosis, aggravating.