Abstract
A linear pulse motor developed by the authors was selected as the actuator for a total artificial heart, because it had the highest thrust/volume ratio of 0.76 newtons/milliliter among eight kinds of linear motor. This paper summarizes the results of an acute animal experiment using a linear pulse motor-driven total artificial heart (linear TAH). The linear TAH consisted of a linear pulse motor (LPM). two sac type blood pumps, and four artificial valves. The mass was 1.3 kg and the volume was 540 milliliters. The volume of the linear TAH was a little larger than the target size of an adult's fist. The linear TAH was attached to a sheep of 42 kg to evaluate its hemodynamic performances. The descending aortic flow rate was 1.5 liters/minute. which was equal to 50% of the rate in the control data. The difference between the flow rate of the left and right blood pumps was 12 to 13%, when the left atrium pressure indicated nomal value. The sheep was sacrificed at 2 post-operative hours. These data suggest that the linear TAH can be used as a circulation supporting device that satisfies clinical circulatory requirements.
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