The Simulation Experiment of Control System for Left Ventricular Assist Device
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摘要: 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。Abstract: Objective To test the accuracy, the reliability and the stability of flow-controlling 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 the flow. With the B valve size changes, the flow-controlling 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 the flow. Conclusions It is a fast-responding and better robust way, by adding the pressure sensor to adjust the speed of motor, to control the flow accurately.
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Keywords:
- left ventricular assist device /
- flow controlling /
- simulation
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