Pressure responsive linear motor driven pump

Details Pressure responsive linear motor driven pump Pressure responsive linear motor driven pump

1990-02-02

1991-11-12

Bertsch, Richard A.

Pumps

Motor driven

Fluid motor

417 45, 417417, 417 18, 623 3, 600 16, 600 17, F04B 4900, G05B 1100

Patent

active

050643533

ABSTRACT:
Pumping apparatus which compresses or decompresses an actuating fluid alternately, which is in turn used to pump an artificial heart. To reduce the size of the apparatus, a diaphragm which contains a non-compressible actuating liquid is driven reciprocatingly by an electric linear motor. To prevent the occurrence of an excessive suction pressure which may be caused by the non-compressibility of the actuating fluid, at the commencement of the suction interval, the current to energize the linear motor is increased gradually and the pressure of the actuating liquid is detected. When the liquid pressure goes out of a selected safety range, the gradual increase ceases. A discharge stroke is detected from an integrated value of the motor current during the discharge interval, and when it reaches a given value, a reversal of the direction of energization of the motor is initiated.

REFERENCES:
patent: 3966358 (1976-06-01), Heimes et al.
patent: 4163911 (1979-08-01), Simes et al.
patent: 4173796 (1979-11-01), Jarvik
patent: 4334180 (1982-06-01), Bramm et al.

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