Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent
1975-11-26
1977-11-01
Freeh, Willliam L.
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
128214C, 128DIG13, 417 9, 417 43, 417 48, 417 63, F04B 2100, A61M 516, F04B 4910
Patent
active
040563332
ABSTRACT:
The present invention relates to a failure alarm system for an intravenous feeding pump in which the pumping force is secured by the projection of a plunger into a chamber filled with the liquid to be pumped, which plunger is encased in a tightly fitting sheath of elastic material. In such a pump, actuation is secured by the application of a force from an actuator to the end of the plunger extending without the wall of a pumping chamber and the return force is secured by the elasticity of the sheath. The actuator of such a pump provides an actuator which can be selectively set to provide an extended range of operations per unit of time and can be modified to control the amount of projection into the pumping chamber by the plunger. In such a combination means is provided by the present invention for sensing the fact that there is a negative pressure, or suction, in the system that is not balanced by the in-flow of liquid, i.e., the amount of fluid delivered to the pump for each operation is less than that required by the setting (thus sensing when a supply is shut off, or less than the preset amount of liquid is reaching the pump).
REFERENCES:
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patent: 2672051 (1954-03-01), Butler
patent: 2767277 (1956-10-01), Wirth
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patent: 2907325 (1959-10-01), Burke
patent: 3543752 (1970-12-01), Hesse
patent: 3559644 (1971-02-01), Stoft
patent: 3874826 (1975-04-01), Lundquist
patent: 3884228 (1975-05-01), Hahn
patent: 3901231 (1975-08-01), Olson
Freeh Willliam L.
Valleylab
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