초록 ▼

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 t

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.

대표청구항 ▼

[ What is claimed is:] [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 m

[ What is claimed is:] [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, andactuation 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, wherein the actuation means comprises elongate drive means attached to the end of the shaft outside the housing and a rotatable wheel oriented to rotate about an axis substantially perpendicular to the longitudinal axis of the elongate drive means and the shaft which, when rotated, engages the drive means along the length thereof to cause the drive means and thus the shaft to move longitudinally.