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[1] 马云善 WANG Yongyuan;CHEN Chen;MA Yunshan(2 Suzhou Tongxin Medical Equipment Co., Ltd., Suzhou, Jiangsu Province 215000)

机构地区：[1]苏州大学机电学院,苏州215000 [2]苏州同心医疗器械有限公司,苏州215000

出　　处：《北京生物医学工程》2019年第2期177-181,共5页Beijing Biomedical Engineering

基　　金：国家自然科学基金(51275282);教育部博士点基金(20123108110009)资助

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) c P (1 c P=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(m A)、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 speed ω(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 R 2>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.

关 键 词：流量拟合 黏度 心衰 人工心脏 CH-VAD 

分 类 号：R318.01[医药卫生—生物医学工程]