Volumetric pump with sterility seal
First 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.
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0 Petitions
Accused Products
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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Citations
12 Claims
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1. A volumetric pump comprising
a 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, and enclosure 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.
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9. A pump for pumping fluids from a fluid source to a fluid sink comprising
a first housing defining an elongate cavity therein, with an opening on one side of the housing adjacent to and in communication with one end of the cavity, the other end being closed, a resilient sheet of material disposed over the opening in the housing, said sheet including an aperture positioned in alignment with the cavity at said one end thereof, an elongate shaft slidably disposed in the aperture so that one end of the shaft extends into the cavity and the other end extends out of the housing, said aperture having substantially the same cross-sectional shape as that of the shaft, and the same cross-sectional dimensions or smaller, inlet means for conveying fluid from the fluid source into the cavity when a negative pressure is produced therein, outlet means for carrying fluid from the cavity to the fluid sink when a positive pressure is produced in the cavity, actuation means for causing the shaft to reciprocate longitudinally in the cavity, sliding back and forth in the aperture, to alternately produce a negative pressure and positive pressure in the cavity, and a second housing enclosing the first housing and the elongate shaft, surrounding the inlet means and outlet means, and including a seal formed about the actuation means to prevent passage of air from outside the second housing to the inside.
Specification