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KMID : 0372919980190040385
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Journal of Biomedical Engineering Research
1998 Volume.19 No. 4 p.385 ~ p.391
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A New Method for Enhancement of Right-Left Pump Output Balance in the Totally Implantable Artificial Heart
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Choi Won-U
Kim Won-Gon
Kim Hee-Chan
Min Byoung-Goo
No Jun-Ryang
Kim In-Yeong
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Abstract
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A new balancing method of atrial pressures balancing for the moving actuator total artificial heart(TAH) without an extra compliance chamber was developed. The asymmetric operation of the pendulous moving actuator have made it possible to compensate the left and right pump output difference by utilizing the interventricular air space as an internal compliance chamber in a pump housing. Furthermore, the balancing performance between left and right pump outputs is increased through the improvement of the flexibility of part of the polyurethane housing. However, the increase of the flexibility of the pump housing causes a little loss of the cardiac output due to the reduction of active filling property. In this paper., a good condition between the balance and pump output performance is evaluated by adjusting the air volume in the interventricular space through a series of in vitro experiments. This new pump was implanted in a sheep weighting 63kg, and it survived for 3 days and the average cardiac output during postoperative days was about 4.2 L/mim with the atrial pressures under 15 mmHg.
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KEYWORD
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Pump output balance, Moving actuator TAH, Interventricular space, Active filling
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