[The Simulation Experiment of Control System for Left Ventricular Assist Device].

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.