北京生物医学工程

用于植入式心室辅助装置的流量拟合算法

Flow estimation algorithm for implantable ventricular assist device

作者：王永远陈琛马云善

单位：苏州大学机电学院(苏州 215000) 苏州同心医疗器械有限公司(苏州 215000)

关键词：流量拟合; 黏度; 心衰; 人工心脏; CH-VAD;

分类号：R318.01

出版年·卷·期（页码）：2019·38·2（177-181）

摘要：

目的通过实验采集参数并对实验数据进行分析,得到一种流量拟合算法,在第3代全磁悬浮人工心脏CH-VAD上实现应用。方法在实验环境设置为定常流、37℃,液体是甘油水溶液,其黏度为(3.5±0.1)cP (1 cP=10-3Pa·s),转速从2 000 r/min到4 000 r/min,流量从0.3 L/min到8.6 L/min,寻找输出流量Q(L/min)与电机电流I(mA)、转速ω(r/min)的关系。结果在各个转速下调节阻尼,I和Q具有线性回归性,相关度R2>0.99,即I=AQ+B,其A、B与转速ω(r/min)相关。结论算法的拟合系数具有很强的稳定性和一致性,在一定范围内算法的拟合精度不受黏度影响,拟合误差在±0.2 L/min,可以用于CH-VAD。

Objective A flow estimation algorithm was obtained by collecting experimental parameters and analyzing experimental data, and was applied to the CH-VAD, which was the third-generation all-maglev artificial heart independently developed and produced by CH BIOMEDICAL,INC. Methods In order to find the relationship between output flow Q(L/min ) with motor current I (mA) and speedω(r/min ) , the experimental environment was steady flow with 37 ℃.Liquid was glycerol-water solution and the viscosity was (3.5±0.1) cP (1 cP = 10-3 Pa·s).The speed of CH-VAD was from 2 000 r / min to 4 000 r / min with flow rate from 0.3 L / min to 8.6 L / min. Results The motor current I ( mA) and output flow Q ( L / min) had linear regression under the condition of adjusting the damping at each speed, and the correlation degree R2 > 0.99, I = AQ+B, in which A and B were related to rotation speed ω ( r / min). Conclusions Within a certain range, the accuracy of flow estimation is not affected by the viscosity, and the error of flow estimation is 0.2 L / min. The flow estimation algorithm can be used for CH-VAD

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