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Nonpulsating IV pump and disposable pump chamber

  • US 4,236,880 A
  • Filed: 03/09/1979
  • Issued: 12/02/1980
  • Est. Priority Date: 03/09/1979
  • Status: Expired due to Term
First Claim
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1. A pump comprising:

  • a disposable pump chamber having an inlet, an outlet, and first and second flexible rolling diaphragm pumping chambers connected between the inlet and outlet;

    a pump housing for receiving the disposable pump chamber;

    a first cylinder in the housing positioned to receive the first flexible rolling diaphragm;

    a second cylinder in the pump housing positioned to receive the second flexible rolling diaphragm;

    a first piston movable in the first cylinder;

    a second piston movable in the second cylinder;

    first valve means for controlling fluid flow between the inlet and the first flexible rolling diaphragm pumping chamber;

    second valve means for controlling the fluid flow between the first flexible rolling diaphragm pumping chamber and the second flexible rolling diaphragm chamber; and

    drive means for causing relative motion of the first cylinder and first piston and relative motion of the second cylinder and second piston to vary the volumes of the first and second flexible rolling diaphragm pumping chambers.

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