人颈动脉窦内流动分离区的研究

STUDY ON THE FLOW SEPARATION IN HUMAN CAROTID BI FURCATION

关于人颈动脉粥样硬化病的病理解剖报告指出,在窦内侧或内外侧同时发生内膜增生和粥样斑块的病例很多见。用血流动力学低切应力因子相关理论,在传统的Y型AHCB模型中无法解释这种现象。本文在音叉型AHCB修正模型中,用可视化技术显示颈动脉窦内定常三维流场,用激光测速技术测量颈动脉窦内膜增生部位的速度剖面,发现除窦外侧分离区外还存在窦内侧分离区,使临床上观察到的粥样斑块分布现象得到合理解释,并证明音叉型AHCB模型是对传统模型的明显改进。

The anatomy reports indicated that atherosclerotic lesions were located on the inner wall,or both inner and out-er walls of the sinus of the carotid bifurcation in the many cases.This phenomenon was not explained by the hypothesis about the low wall shear stress in the traditional Y-AHCB model.In this paper,in the modified model of″average human carotid bi furcation(AHCB)″the three-dimension field in carotid sinus under steady flow conditions was studied using flow visualization techniques and laser-Doppler anemometer(LDA).The effects of the shape of branches on the flow separation and were observed.A new separation zone along inner wall of sinus was found.It can be used to explain plaque distribution on the inner wall of sinus.The modified model was proved to be a more rational model for hemodynamics and atheosclerosis study in human carotid bifurcation.