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Nonpulsating TV pump and disposable pump chamber

  • US 4,410,322 A
  • Filed: 09/10/1980
  • Issued: 10/18/1983
  • Est. Priority Date: 03/09/1979
  • Status: Expired due to Term
First Claim
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1. A volumetric infusion pump for pumping fluid from a source to a patient comprising:

  • a pump inlet for receiving fluid from the source;

    a pump outlet for supplying fluid under pressure to the patient;

    a first pumping chamber having a first cylinder, a first piston, first flexible diaphragm means between the first cylinder and the first piston, a first inlet, and a first outlet, the first pumping chamber having a variable volume depending upon the relative positions of the first cylinder and first piston;

    a second pumping chamber having a second cylinder, a second piston, second flexible diaphragm means between the second cylinder and the second piston, the second inlet connected to the first outlet, and a second outlet, the second pumping chamber having a variable volume depending upon the relative position of the second cylinder and second piston;

    a third chamber having a third inlet and a third outlet, the third inlet being connected to the second outlet and the third outlet being connected to the pump outlet, the third chamber comprising a third cylinder, a third piston, and a third flexible diaphragm means between the third cylinder and the third piston so that the third piston moves in the third cylinder as a function of fluid pressure within the third chamber;

    means for sensing fluid pressure within the third chamber by sensing position of the third piston;

    first valve means for controlling fluid flow between the pump inlet and the first inlet;

    second valve means for controlling fluid flow between the first outlet and the second inlet;

    drive means for causing relative motion of the first cylinder and first piston and relative motion of the second cylinder and second piston;

    valve control means for controlling the first and second valve means such that one of the first and second valve means is closed at all times; and

    wherein the first, second and third flexible diaphragm means, the pump inlet and the pump outlet form an integral disposable unit having a sealed main fluid flow passage between the pump inlet and the pump outlet, so that fluid is pumped from the pump inlet to the pump outlet without physically contacting the housing, the cylinders, the pistons, the valve means, the drive means, or the valve control means.

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