基于电机参数的离心式左心室辅助装置流量估算方法
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1.苏州大学机电学院;2.苏州同心医疗器械有限公司,江苏苏州

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Flow estimation method of centrifugal left ventricular assist device based on motor parameters
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    摘要:

    在左心室辅助装置的临床应用中,流量是具有重要参考意义的数据,但流量传感器受限于其可靠性而难以应用。本文针对苏州同心医疗器械有限公司研制的CH-VAD血泵提出了一种基于电机工作参数的流量估算方法,将血泵系统拆解为电机和离心泵两个模块进行分析,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,然后通过实验测试了在不同转速和粘度下流量与力矩的关系,并提出了拟合关系式。在两台血泵的测试数据中,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,在粘度变化时,两台血泵流量估算的均方根误差分别为0.260L/min和0.274L/min,具有较高的精度,且两台血泵的拟合参数和估算结果具有很好的一致性,证明该流量估算方法可用于CH-VAD血泵。在脉动条件下的测试表明该方法受脉动影响较小,且能够很好地跟随实际流量波形。

    Abstract:

    In the clinical application of left ventricular assist devices, flow rate is an important parameter, but flow meters are limited to be used because of it’s poor reliability. This paper proposes a new flow estimation method based on the working parameters of the motor for the CH-VAD blood pump developed by CH Biomedical, Inc. The blood pump system is disassembled into two modules: a motor and a centrifugal pump for analysis. First, the motor’s voltage, current, speed and duty cycle are calculated to obtain the output torque of the motor, and then the relationship between flow and torque at different speeds and viscosities is tested through experiments, and a fitting relationship is proposed. In the data of the two blood pumps, the goodness of fitting reached 0.9826 and 0.9829, respectively. The parameters obtained by fitting are used for verification. When the viscosity changes, the root-mean-square error of the estimated flow of the two blood pumps is 0.260L/min and 0.274L/min, respectively. It shows a high accuracy, while the fitting parameters of the two blood pumps and the estimation results are in good agreement, which proves that the flow estimation method can be used for CH-VAD blood pumps. Tests under pulsating flow show that this method is less affected by pulsation and can follow the actual flow waveform well.

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  • 收稿日期:2021-02-23
  • 最后修改日期:2021-03-04
  • 录用日期:2021-03-09
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