Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1977-12-15
1979-08-21
Croyle, Carlton R.
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
74 182, 222373, 222380, F04B 3910
Patent
active
041652088
ABSTRACT:
The present invention comprises a small, precise measuring pump provided with a germ barrier that is specifically designed for intravenous feeding devices and comprises: inlet and outlet chambers which are preferably integral one with the other, an inlet adapted to receive a tube from a storage device and the outlet chamber provided with an outlet adapted to receive a tube for delivery of material pumped to a patient; a passageway between the two chambers, which serves as an outlet from the inlet chamber and an inlet into the outlet chamber; a valve (preferably a float valve) associated with each inlet; and an actuating device which includes a piston and a tightly fitting resilient sheath enclosing the piston, the combination of piston and sheath projecting into the inlet chamber. The movement of the piston inwardly and outwardly within the inlet chamber provides the pumping force for the operation of the pump, and the sheath provides a sterile seal between the piston and the body of the pump and also, if made of resilient material, such as rubber, provides a force for returning the piston to an inoperative position. A pumping force may be applied to the external end of the piston by any suitable means.
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Croyle Carlton R.
Look Edward
Valleylab
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