초록 ▼

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 apert

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.

대표청구항 ▼

[ We claim:] [1.] A volumetric pump comprisinga pump mechanism operable to pump fluid from a fluid source to a fluid sink, said pump mechanism comprising a housing and a pump shaft,actuation means coupled to said pump shaft and configured to cause the pump shaft to move to operate the pump mechanism

[ We claim:] [1.] A volumetric pump comprisinga pump mechanism operable to pump fluid from a fluid source to a fluid sink, said pump mechanism comprising a housing and a pump shaft,actuation means coupled to said pump shaft and configured to cause the pump shaft to move to operate the pump mechanism,a moveable shaft coupled at a first end to said actuation means, andenclosure means enclosing the pump mechanism, actuation means, and part of the moveable shaft, and including a sphincter seal for sealing about the moveable shaft which extends therethrough, from outside the enclosure means to the inside thereof, thereby sealing the pump mechanism from outside contamination.