Simulation Experimental Study on Mock Circulation System / 医用生物力学

ABSTRACT

Objective To study the mock circulation system (MCS) which can accurately reproduce the human hemodynamic environment for in vitro test in the development of artificial organs such as ventricular assist devices (VAD) and artificial heart-lung machine.Methods A double-heart MCS including the systemic and pulmonary circulation was established, which basically covered the main physiological characteristics and functions of the cardiovascular system. The simulation of valves and arteries were proposed with a new way made of silicone material. The MCS could simulate a variety of physiological environments such as normal human body, heart failure, valvular diseases, arteriosclerosis and peripheral obstruction changes by adjusting the control system parameters or structural parameters.The sensor and control system were used to realize the real-time display, control and data preservation of pressure and flow.Results The MCS could simulate the hemodynamic environment of normal human body and a variety of diseases, which were basically consistent with the actual human condition. The new valve and artery model reduced pressure fluctuations in a much better way. The HeartCon VAD of RocketHeart was connected to the experimental platform under simulated state of heart failure, and the hemodynamic environment (aortic pressure, left atrial pressure, cardiac output, etc.) could all be recovered to the normal range.Conclusions The MCS can accurately reproduce the hemodynamic environment of body and pulmonary circulation under a variety of physiological states, and provide an effective experimental platform for the performance test and control strategy design of artificial organs such as VAD. At the same time, the simulation method of making valves and arteries with silicone material can also be further improved in MCS.