Intravenous piston pump disposable & mechanism
AssigneeCardinal Health 303, Inc.
InventorBrett H. Franks
Life of this patent
Estimating the term…
Abstract
An apparatus for delivery of fluids to a patient includes an inlet tube and an outlet tube connected to each other at an angular joint. A rotary valve and a piston are fitted to the angular joint forming a chamber. The rotary valve is provided with a priming channel notch and a pumping notch. For priming operation with the fluid delivery apparatus, a user sets the rotary valve to a priming position. During pumping operation, the rotary valve rotates in coordination with the piston to transfer a quantum of fluid from the inlet tube to the outlet tube via the chamber. A second piston is optionally provided on the outlet tube for smoothing out flow rate pulsations.
Claims22
A fluid delivery apparatus comprising:
- an inlet tube having a channel for passage of fluid from a proximal end to a distal end;
- an outlet tube having a channel for passage of fluid from a proximal end to a distal end;
- an angular joint formed by a connection between the distal ends of the inlet tube and the outlet tube, the angular joint having an internal cavity connected between the channels of the inlet tube and the outlet tube;
- a first piston configured to reciprocate in a first enclosure fluidly connected to the internal cavity, the first piston having a first aspiration cavity with a first aspiration capacity;
- and
- a valve rotatably positioned within the internal cavity, the valve configured to fluidly couple the inlet tube and the outlet tube in a priming position of the valve and to convey fluid between the inlet tube and the outlet tube and from the first aspiration cavity when the valve is rotated between a first pumping position and a second pumping position.
A method of delivering fluid from an inlet tube connected to a fluid reservoir to an outlet tube in a pumping cycle;
- the method comprising:
- positioning, during an inflow phase of the pumping cycle, a valve to a first pumping position to establish a fluid contact between the inlet tube and a first aspiration cavity without having a fluid connection between the first aspiration cavity and the outlet tube;
- moving, during the inflow phase, a first piston connected the first aspiration cavity to increase the volume of the first aspiration cavity;
- positioning, during an outflow phase of the pumping cycle, the valve to a second pumping position to establish a fluid contact between the first aspiration cavity and the outlet tube without having a fluid connection between the inlet tube and the first aspiration cavity;
- moving, during the outflow phase, the first piston to decrease the volume of the first aspiration cavity.
A valve apparatus for use in a fluid delivery system having an inlet tube and an outlet tube, the valve apparatus comprising:
- a cylindrical base portion having a top end and a bottom end, the bottom end having a priming channel notch and a first and a second pumping channel notches;
- and
- a cylindrical top portion having a proximal end connected to the top end base portion and a distal end having a handle;
- wherein the first and the second pumping channel notches are positioned circumferentially and are spaced apart from each other such that when one of the first and the second pumping channel notches is positioned to make a fluid contact between an aspiration cavity and either the inlet tube or the outlet tube, the other pumping channel notch does not make a fluid contact between the aspiration cavity and the inlet tube or the outlet tube;
- and
- wherein the first and the second pumping channel notches are vertically offset from the priming channel notch such that:
- when the priming channel notch is in fluid contact with the inlet tube and the outlet tube, the first and the second pumping channel notches are not in fluid contact with the inlet tube and the outlet tube;
- and
- when the first and the second pumping channel notches are in fluid contact with the inlet tube or the outlet tube, the pumping channel notch is not in fluid contact with the inlet tube and the outlet tube;
- and
- wherein the priming channel notch has a width that at least spans the inlet tube and the outlet tube.
Dependencies are inferred from the claim text.