A roller-screw-type electric-motor-driven total artificial heart has been manufactured and tested in vivo and in vitro. The system utilizes a roller screw to convert rotary to rectilinear motion. The roller screw is rotated by a three-phase delta-wound brushless motor. Pusher plates are attached to either end of the roller screw shaft. Blood pumps are attached to either end of the motor housing and contain flexible sacs with Bjork-Shiley convexo-concave tilting disk valves. The pumps are actuated alternately by the pusher plates. The roller screw nut is reversed by the electric motor for each cycle. The power required by the blood pump and electronics has been measured both in vitro and in vivo. The data suggest that the present system, when pumping within the physiological range, will achieve efficiencies ranging from 16. 1% to 20. 9%.
|Original language||English (US)|
|Title of host publication||IEEE/Engineering in Medicine and Biology Society Annual Conference|
|Number of pages||2|
|State||Published - 1987|
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