Development of Artificial Heart Actuator using Linear Motor

本研究提出了两种新型直线脉冲电机执行器。研制了一种采用扁平型直线脉冲电机的便携式人工心脏驱动器。该驱动器是为全人工心脏植入而设计的，但它也适用于左、右、双室辅助人工心脏。直线电机的动子两端放置两个聚亚安酯圆筒，它交替产生压缩空气和真空，交替地同时对左、右人工心脏进行收缩和舒缩。体外试验采用Donovan型模拟循环系统，将一对140毫升的隔膜式人工心脏植入小牛体内，成功地将这种便携式人工心脏驱动器用于小牛。还研制了一种使用圆柱形直线脉冲电机的全人工心脏驱动器。该驱动器的工作原理与上述电机相同。司机在驾驶过程中完全没有噪音，而且有很好的操控性。该驱动器结构简单，可以通过改变励磁电流来控制推力。对于25毫米的行程，心率可以控制在每分钟90到156次之间，精度很高。

New two actuators using flat type and cylindrical linear pulse motors were proposed in this research. A portable artificial heart driver has been developed using a flat type linear pulse motor. This driver is designed for total artificial heart implantation , but it is also applicable to left-, right-, and bi-ventricular assisting artificial hearts.Two polyurethane cylinders are placed at both ends of a mover of the linear motor, which generate compressed air and vacuum alternately to make systole and diastole for left and right artificial hearts at the same time in alternate phase.In-vitro tests were performed using a Donovan type mock circulatory system with a pair of diaphragm type artificial hearts of 140 milliliters designed for implantation in a calf.The experiment using this portable artificial heart driver to a calf was carried out successfully.A total artificial heart driver has also developed using a cylindrical linear pulse motor. The principle of operation of this driver is same as above motor. The driver is completely noiseless in its driving and has good manupulation. The driver has a simple configuration and can control the thrust by changing the exciting current. The heart rate can be controlled from 90 to 156 beats per minute for stroke 25 millimeters with high accuracy.