Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1977-11-07
1980-09-09
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 45, F04B 4906, A61M 500
Patent
active
042215439
ABSTRACT:
A blood pump system in which a roller pump is provided for pumping blood through a flexible tube. A low voltage D.C. motor is provided having an output shaft. An electrical control circuit is connected to the motor for applying the necessary voltage to drive the motor at a predetermined speed. Gearing means are provided connecting the motor's output shaft to drive the roller pump. Means are optically coupled to the motor for controlling the speed of the motor. Means are connected to the optically coupled means to determine the blood flow rate being pumped through the tube by the pump. Means are provided which display a digital readout of the flow rate. The roller pump is provided with an arcuate bearing surface, which carries the flexible tube, the bearing surface defining an arc of approximately 168.degree.. Lead ramps extend from each end of the bearing surface and are substantially tangent to the end of the surface from which the respective ramp extends. Means are provided for allowing a variable rate of independently adjusting the radial deflection of each of the rollers of the roller pump. The system is also provided with isolation means for reducing leakage current and thus lowering the potential shock hazard to the patient from A.C. line voltage. Motor runaway and overspeed protection are also provided.
REFERENCES:
patent: 3855515 (1974-12-01), Hutchins
patent: 3985133 (1976-10-01), Jenkins et al.
patent: 4024864 (1977-05-01), Davies
patent: 4037598 (1977-07-01), Georgi
patent: 4108575 (1978-08-01), Schal
patent: 4131393 (1978-12-01), Magnussen
Cooper Jamshed R.
Cosentino Louis C.
Niemi Bill H.
Silbernagel John P.
Freeh William L.
Renal Systems, Inc.
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