基于电机参数的离心式左心室辅助装置流量估算方法  

Flow Estimation Method of Centrifugal Left Ventricular Assist Device Based on Motor Parameters

作　　者：陆腾飞 陈琛[1,2] LU Tengfei;CHEN Chen(College of Mechanical and Electrical Engineering,Soochow University,Suzhou 215131,Jiangsu,China;CH Biomedical,Inc.,Suzhou 215213,Jiangsu,China)

机构地区：[1]苏州大学机电学院,江苏苏州215131 [2]苏州同心医疗器械有限公司,江苏苏州215123

出　　处：《医用生物力学》2022年第1期112-117,共6页Journal of Medical Biomechanics

摘　　要：目的针对苏州同心医疗器械有限公司研制的CH-VAD型血泵进行研究,利用血泵中可获得的电压、电流、转速、占空比以及流体的黏度作为输入,建立实时估算血泵流量的方法。方法将血泵系统拆解为电机和离心泵两个模块单独进行分析。首先根据电机的电压、电流、转速以及占空比计算得到电机的输出力矩,然后通过实验测试在不同转速和黏度下流量与力矩的关系,并根据实验数据建立拟合模型。结果1、2号血泵拟合优度分别达到0.9826和0.9829。利用拟合所得参数进行验证,在黏度变化时,1、2号血泵流量估算的均方根误差分别为0.260、0.274 L/min,且两台血泵的拟合参数和估算结果具有很好的一致性。该流量估算方法能够实时跟随实际流量波形,对平均流量的估算精度不受脉动条件的影响。结论提出的流量估算方法适用于CH-VAD血泵,能够在转速1600~3600 r/min、流量0.4~8 L/min、黏度1.2~5 mPa·s范围内准确估算血泵的流量,且在脉动条件下能够很好跟随流量波形。Objective To study CH-VAD blood pump developed by CH Biomedical Inc.,a method for estimating the real-time flow of blood pump was established by using the voltage,current,speed,duty cycle,and fluid viscosity as the input data.Methods The blood pump system was disassembled into two modules,the motor and the centrifugal pump.Firstly,the output torque of the motor was calculated according to the voltage,current,speed and duty cycle of the motor,then the relationship between flow and torque at different speeds and viscosities was tested through experiments,and a fitting model was established based on the experimental data.Results The fit goodness of Pump 1 and Pump 2 reached 0.9826 and 0.9829,respectively.The fitting parameters were used for verification.When the viscosity changed,the root mean square error for the estimated flow of Pump 1 and Pump 2 was 0.260 and 0.274 L/min,respectively.The fitting parameters and estimated results of the two blood pumps were in good agreement.The flow estimation method could follow the actual flow waveform in real time,and the accuracy of the estimated average flow was not affected by the pulsation.Conclusions The flow estimation method proposed in this paper is suitable for CH-VAD blood pumps.It can accurately estimate the flow of blood pumps in the range of speed 1600-3600 r/min,flow 0.4-8 L/min,viscosity 1.2-5 mPa·s,and can follow the flow waveform well under pulsating conditions.

关 键 词：流量估算 黏度 心衰 左心室辅助装置 离心泵 

分 类 号：R318.01[医药卫生—生物医学工程]