血管结构对血管机器人外流场的影响研究

发布时间：2018-06-20 03:17

本文选题：血管机器人 + 血管结构　；参考：《科学技术与工程》2014年02期

【摘要】：血管结构对血流流动参数产生影响,也会对介入的血管机器人外流场产生影响。将螺旋驱动的血管机器人介入到实际血管的血栓变窄位置的下游、分叉位置的上游、弯曲位置的下游,通过两相流场数值模拟分析,发现不同的血管结构对血管机器人外流场影响不同。血流脉动速度上升时,血栓变窄位置流动会对血管机器人产生阻碍作用;分叉位置上游血流使血管机器人尾流低速区增大;弯曲位置下游血流使血管机器人近前部速度不均匀,尾部有较大区域的低速涡流区,会影响机器人运行;而且均是头部受到红细胞的剪切应力较大。血流脉动速度下降时,血栓变窄位置血流会对血管机器人产生助推作用;分叉位置上游血流会使血管机器人前端区域速度非均匀分布,会对血管机器人运行产生影响;弯曲位置下游血流使血管机器人头部低速区的范围较大,而尾部流速较高:除了分叉位置上游血流红细胞对血管机器人头部产生较大的剪切应力,其他两种结构下血流红细胞对机器人尾部剪切应力较大。
[Abstract]:The vascular structure affects the blood flow parameters and the flow field of the interventional vascular robot. The spiral driven vascular robot is involved in the downstream of the actual vessel thrombus narrowing position, the bifurcation position upstream, the bending position downstream, and the numerical simulation analysis of the two-phase flow field is carried out. It is found that different vascular structures have different effects on the flow field of vascular robot. When the velocity of blood flow fluctuates, the flow of blood clots narrows will hinder the vascular robot; the upstream blood flow in the bifurcation position will increase the low velocity area of the wake of the blood vessel robot; the downstream blood flow in the bending position will make the velocity of the near front part of the blood vessel robot uneven. The low speed eddy current region in the tail of the robot will affect the operation of the robot, and the head is subjected to the shear stress of red blood cells. When the pulsating velocity of blood flow decreases, the blood flow in the position of thrombus narrowing will boost the blood vessel robot, and the upstream blood flow in the bifurcation position will make the velocity of the front end of the blood vessel robot distribute unevenly, which will have an effect on the operation of the blood vessel robot. The blood flow downstream of the curved position makes the low velocity region of the head of the vascular robot larger, while the velocity of the tail is higher: apart from the bifurcation position, the red blood cells in the upper reaches of the blood stream have a large shear stress on the head of the vascular robot. Under the other two structures, the blood red blood cells have great shear stress on the tail of the robot.
【作者单位】：广州大学机械与电气工程学院;
【基金】：广州市属高校科技计划(2012A084) 国家自然科学基金(51205072)资助
【分类号】：R319;TP242

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