Volumetric pump with sterility seal

Details Volumetric pump with sterility seal Volumetric pump with sterility seal

1997-05-23

1999-12-28

Freay, Charles G.

Pumps

Motor driven

Pump and motor interconnected by endless flexible...

417415, 92137, 92140, 92168, 92DIG4, 74 44, 74 8915, 74 892, F04B 1700, F01B 900, F61H 2122

Patent

active

060073101

ABSTRACT:
A volumetric pump for administering intravenous fluids to a patient includes a first housing having an elongate cavity therein with an open and a closed end. A resilient sheet of material having a centrally-located aperture covers the open end, and a pump shaft is slidably disposed through the aperture to form a sphincter seal therebetween. An inlet conduit leading from a fluid source (an IV bag) passes through the housing into the cavity near the open end thereof, and an outlet conduit leading to a fluid sink (the patient) passes through the housing from the cavity near the closed end thereof. A drive shaft is attached to the pump shaft to drive it back and forth in reciprocating motion inwardly and outwardly of the cavity to produce, respectively, a positive pressure forcing fluid out of the outlet conduit to the fluid sink, and a negative pressure forcing fluid from the fluid source through the inlet conduit. A second housing encloses the first housing and pump shaft, and includes a seal formed about the drive shaft to seal the inside of the second housing from the outside.

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