Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1997-09-24
1998-12-15
Thorpe, Timothy
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
417566, 137102, 1375124, F04B 3910
Patent
active
058488812
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a infusion pump for medical liquids.
The document FR-A-2 689 014, in the name of the Applicant company, describes a infusion pump for medical liquids which comprises at least one device with cylinder and plunger for suctioning a liquid from a container and driving the liquid back into a tubing connected to the patient.
This infusion pump comprises: which, containing a plunger driven in a reciprocating movement, opens out in one of the faces of the component, perpendicular to this face, which each cylinder opens out, includes, in line with each cylinder, a recess of a diameter greater than that of the corresponding cylinder, and communicating with a container for supply of liquid, the two components and including an orifice in line with each cylinder, directed toward the first component is stepped and comprises an external part which bears, via the membrane, on that face of the first component in which the corresponding cylinder opens out, just around this cylinder, and a central part projecting in the direction of the inside of the cylinder, this disk including through-holes which are uniformly distributed and are arranged in proximity to its periphery, component, and first component as the cylinder in question, this duck, associated with a removal tubing formed in this component, being arranged in proximity to the metering cylinder, in line with the recess of the second component, but beyond the disk which this recess contains, and being covered by the membrane held securely between the two components.
In the known pump it is necessary to provide a spring exerting a pressure on the disk in the direction of the first component. The presence of this spring has the disadvantage that a metal material comes into contact with the medical liquid transferred via the pump. In addition, the presence of this spring above the disk necessitates that the disk be guided in the area of the periphery thereof in the recess formed in the first component, which leads to a stepped disk structure, and to the provision of through-holes in the disk, in proximity to its periphery, in order to permit the passage of the medical liquid.
OBJECTS AND SUMMARY OF THE INVENTION
A first object of the invention is to make available a infusion pump for medical liquids, in which the spring which bears on the disk in order to guarantee that the latter is impermeable can be omitted.
Another object of the invention is to simplify the structure of the disk bearing against the membrane.
To this end, the infusion pump for medical liquids to which the invention relates, of the type comprising: containing a plunger driven in a reciprocating movement, opens out in one of the faces of the component, perpendicular to this face, which the cylinder opens out, includes, in line with the latter, a recess of a diameter greater than that of the cylinder, and communicating with a container for supply of liquid, the two components and including an orifice in line with the cylinder, directed toward the first component bears on the membrane, first component as the cylinder, this duct, associated with a removal tubing formed in this component, being arranged in proximity to the cylinder, in line with the same recess of the second component, but beyond the metering cylinder, and being covered by the membrane held securely between the two components, the supply of the liquid and in the zone of the recess formed in the second component outside the metering cylinder, an elastic ring molded with the membrane and bearing on the bottom of the recess formed in the second component, the disk bearing on the membrane being of a diameter smaller than that of this recess and including central guiding means.
The presence of the ring on the membrane forming a flap valve replaces the known metal spring in the device in the document cited in the introduction. The compression of this elastic ring creates the impermeability of the chamber at the discharge pressure used.
This structure has the advantage of omitting a c
REFERENCES:
patent: 4737083 (1988-04-01), Meyer
patent: 5503538 (1996-04-01), Wiernicki et al.
Compagnie de Developpement Aguettant Parc Scientifique Tony-Garn
Thorpe Timothy
Tyler Cheryl J.
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