Volumetric pump/valve
First Claim
1. A pump for pumping fluids from a fluid source to a fluid sink comprisinga 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, andsupport means on each side of the sheet of material adjacent the aperture for contacting and preventing distending or collapsing of the sheet of material as the shaft slides through the aperture.
3 Assignments
0 Petitions
Accused Products
Abstract
A volumetric pump for administering intravenous fluids to a patient comprises a 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. The shaft is driven 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.
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Citations
34 Claims
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1. A pump for pumping fluids from a fluid source to a fluid sink comprising
a 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 support means on each side of the sheet of material adjacent the aperture for contacting and preventing distending or collapsing of the sheet of material as the shaft slides through the aperture.
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6. A pump for pumping fluids from a fluid source to a fluid sink comprising
a 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 wherein the actuation means includes means for selectively varying the magnitude of the excursion of the reciprocating shaft, to thereby vary the rate of pumping of the fluid, means for alternately pushing the shaft in a direction into the cavity, and releasing the shaft from being pushed, and biasing means for forcing the shaft in a direction out of the cavity when the shaft is released by the pushing means, and wherein said excursion varying means includes stop means for stopping the movement of the shaft in the direction out of the cavity at selectable distances.
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8. A volumetric pump comprising
an elongate housing open at first and second ends and formed with a first chamber adjacent the first open end and a second chamber adjacent the second open end, and including an opening connecting the chambers, a resilient sheet of material disposed over the first open end, and including an aperture therein, a tubular plunger, one end of which is inserted through the aperture in the resilient sheet, into the first chamber, for carrying fluid to the first chamber, drive means for moving said one end of the tubular plunger to reciprocate in the first chamber, alternately toward and away from the housing, first valve means disposed at said one end of the tubular plunger for allowing the flow of fluid therefrom when the plunger is moved away from the housing to produce a negative pressure in the first chamber, and for preventing the flow of fluid thereinto when the plunger is moved toward the housing to produce a positive pressure in the first chamber, and second valve means disposed in the second chamber at said opening between chambers to allow the flow of fluid from the first chamber, through the opening, to the second chamber, and out the second open end when a positive pressure is produced in the first chamber, and to prevent the flow of fluid from the second chamber to the first chamber when a negative pressure is produced in the first chamber.
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11. A volumetric pump comprising
a central hollow housing open at opposite ends and having a first resilient sheet of material disposed in the housing between the ends to divide the hollow of the housing into two chambers, said sheet of material having an opening therein to allow communication between the two chambers, an inlet tubular section having a primary tubular portion for receiving fluid, and two secondary tubular portions branching from the primary portion to each receive fluid therefrom, and terminating in free ends joined to the housing, each near a respective opposite end of the housing to carry fluid to a respective housing chamber, first and second check valves, each disposed in a respective secondary tubular portion to allow the flow of fluid from the primary tubular portion toward the housing, and to prevent flow in the opposite direction, an outlet tubular section having two secondary tubular portions, each joined at one end to a respective opposite end of the housing to close the open ends of the housing and carry fluid from a respective housing chamber, and having a primary tubular portion joined to the other ends of the secondary tubular portions of the outlet tubular section, to receive fluid therefrom, third and fourth check valves, each disposed in a respective secondary tubular portion of the outlet tubular section, to allow the flow of fluid from the housing toward the primary tubular portion of the outlet tubular section, and to prevent flow in the opposite direction, elongate plunger means slidably disposed to extend through the opening in the first sheet of material so that portions of the plunger means reside in the two chambers, and means for selectively moving the plunger means back and forth in the two chambers to alternately produce negative pressure in one chamber and positive pressure in the other, and vice versa, to thereby cause fluid to flow from the inlet tubular section, through the housing to the outlet tubular section.
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20. A pump for pumping fluids from a fluid source to a fluid sink comprising
a 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, and 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, said actuation means including means for selectively varying the magnitude of the excursion of the reciprocating shaft, to thereby vary the rate of pumping of the fluid, and wherein the cavity and shaft have approximately the same cross-sectional shape and size except at said one end in which the cavity is enlarged, and wherein the pump further comprising a trough formed in a wall of the cavity and running adjacent thereto and in fluid communication therewith substantially the length of the cavity, and wherein the inlet means and outlet means are in fluid communication with the enlarged portion of the cavity.
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29. A pump for pumping fluids from a fluid source to a fluid sink comprising
a 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, and 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, said actuation means including means for selectively varying the magnitude of the excursion of the reciprocating shaft, to thereby vary the rate of pumping of the fluid, and wherein said excursion varying means includes drive means moveable, in response to said actuation means, in a reciprocating manner in a pathway generally parallel with the direction of movement of the shaft, said drive means including means for engaging the shaft at a location along the pathway moving toward the housing, to move the shaft with movement of the drive means, and for disengaging the shaft at said location along the pathway moving away from the housing, and means for selectively varying the location at which the drive means engages and disengages the drive shaft to thereby vary the magnitude of the excursion of the shaft.
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30. A pump for pumping fluids from a fluid source to a fluid sink comprising
a 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, 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, 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, wherein the cavity and shaft have approximately the same cross-sectional shape and size except at said one end in which the cavity is enlarged, and wherein the inlet means and outlet means are in fluid communication with the enlarged portion of the cavity a trough formed in a wall of the cavity and running adjacent thereto and in fluid communication therewith substantially the length of the cavity, and 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.
Specification