一种左心室辅助装置流量控制系统的仿真实验

摘要

Objective To test the accuracy, the reliability and the stability offl ow-controling method of a new percutaneous left ventricular assist device.Methods With the AMEsim to set up a simulation model, analysis the variations of motor speed, flow and pressure by adjusting the size of valve. and we test the improved-theoretical model with outside experiment.Results In the simulation experiment, with the variations of pressure from A, the system can regulate the motor speed to maintain the pump outlet pressure 1.1×105 Pa~1.2×105 Pa and control thefl ow. With the B valve size changes, thefl ow-controling by the system identify and change the motor speed, to maintain the pump inlet pressure from-0.25×105 Pa to-0.10×105 Pa. In outside experiment, with the variations of the size of valve A and valve B, the pump can change the voltage by self-regulation, maintain the entrance and exit of pressure is relatively stable and control thefl ow.Conclusions It is a fast-responding and better robust way, by adding the pressure sensor to adjust the speed of motor, to control thefl ow accurately.%目的：检测新研发的新型经皮插入式左心辅助装置流量控制系统的准确性、可靠性、稳定性。方法应用AMEsim软件建立仿真模型，分别调节心脏和左心房的节流阀大小，分析模型中电机转速、流量和压力变化，并结合体外模拟实验，验证模型准确性。结果仿真实验中，电机转速能随A阀大小变化而改变，泵的流量也随之改变，泵出口压力维持在1.1×105 Pa～1.2×105 Pa。B阀大小的改变，也能早期识别及改变电机转速，自动调节流量，泵入口压力维持在-0.25×105 Pa至-0.10×105 Pa。体外实验中，随A阀、B阀大小的改变，泵可通过电压改变实现自身调节，维持泵出入口压力的相对稳定，最终实现流量控制。结论通过增设压力传感器控制电机的转速，可精确控制流量，稳定性强，响应速度快。