植入型轴流血泵设计及其流体性能数值预报  

New Designed Implantable Axial-flow Blood Pump and Its Numerical Prediction Study

作　　者：叶亮[1] 范慧敏[1] 洪方文[2] 周连第[2] 陈应生[2] 刘中民[1] 

机构地区：[1]同济大学附属东方医院,上海200120 [2]中国船舶科学研究中心,无锡214082

出　　处：《系统仿真学报》2011年第10期2046-2051,共6页Journal of System Simulation

基　　金：国家高技术研究发展计划(863计划)(2007AA02Z439);浦东新区卫生系统重点学科群建设(pkzxkq2010-016)

摘　　要：可植入心室辅助装置(俗称人工心脏)是治疗终末期心衰的有力工具,设计以轴流血泵居多。给出了一种植入型轴流血泵的新颖设计,血液由置于无刷电机圆柱磁钢转子内孔的大、小串列转子驱动,磁钢内孔形成主流道,而电机定子内径和磁钢转子外径间的缝隙形成支流道。这样主流道内没有电机磁钢转子,流道阻碍小面积大,可保证大血量流从主流道通过。支流道间隙小即无刷电机定子线圈和转子磁钢的气隙小,保证了电机的高效率,从而显著减小了轴流血泵整体的体积和重量,设计的轴流血泵外径为29.6 mm,长度72 mm,重量158 g,泵转速为9000转/分,压头为100 mm Hg,流量可达8升/分,完全适用于植入式心室辅助装置,已成功地应用于植入小牛胸腔的动物试验。还基于CFD Fluent软件,建立了模拟人工心脏轴流血泵的数学模型,数值预报和实验得到的流体动力性能有较好的吻合,最大误差在10%以内,达到在工程实用精度,表明利用CFD工具可以预报植入型轴流血泵的流体动力性能,指导人工心脏的设计。A new designed implantable axial-flow blood pump was introduced. Blood is driven by big-smaU tandem impeller installed in the inner hole of cylinder magnet ofbrushless direct current motor. The inner hole of cylinder magnet will take the shape of the main flow passage while the gap between the inner end of stator and the outer end of cylinder magnet of motor takes the shape of the tributary flow passage. There is no magnets rotor in the main flow passage and more blood flow can pass through it. The gap of tributary flow passage is very small so the efficiency can be increased and the volume and weight of blood pump can be reduced greatly. The outer diameter, length and weight of manufactured implantable axial-flow blood pump are 29.6 mm, 76 mm and 158 g respectively. The impeller can generate 100 mmHg pressure head and 8 L/min flow rate when spinning at 9000 rpm. It has been implanted into some calves in experimental tests. Meanwhile, a mathematical model of simulating theflow of axial-flow blood pump was established. The numerical prediction of performance of implantable axial-flow blood pump may be carried out by combining this mathematical model and Fluent software. The agreement between the numerical predictions and experimental results are satisfactory with the maximum error within 10%.

关 键 词：植入型轴流血泵 计算流体力学(CFD) 数值预报 流体动力性能 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]