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Medical treatment system and methods using a plurality of fluid lines

  • US 9,078,971 B2
  • Filed: 11/02/2012
  • Issued: 07/14/2015
  • Est. Priority Date: 01/23/2008
  • Status: Active Grant
First Claim
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1. A dialysis system comprising:

  • a pumping cassette having a generally planar body and a first flexible membrane on a side of the cassette overlying a pumping chamber on the cassette; and

    a cycler having a control surface including a second flexible membrane arranged to contact and mate with the first flexible membrane of the pumping cassette, the cycler being arranged to move one or more portions of the second flexible membrane to move at least a portion of the first flexible membrane overlying a pumping chamber on the cassette to cause fluid flow in the pumping chamber, the cycler further including at least one port at the control surface arranged to remove fluid in a space between the first and second flexible membranes to draw the first and second flexible membranes toward each other and to introduce fluid into the space to move the first and second flexible membranes away from each other;

    wherein the cycler includes;

    a base unit comprising a source of positive pressure, a source of negative pressure, a pressure distribution manifold, and a pressure delivery block;

    the pressure distribution manifold comprising valved channels between the positive and negative pressure sources and the pressure delivery block;

    the pressure delivery block comprising a depression in valved fluid communication with the positive and negative pressure sources, the depression arranged to mate with a pumping chamber of the cassette;

    wherein the control surface is positioned on the pressure delivery block so as to be interposed between the first flexible membrane of the cassette and the depression of the pressure delivery block;

    wherein the pressure distribution manifold is configured to provide a valved channel between the negative pressure source and the space between the opposing first and second flexible membranes to generate a vacuum seal between the first and second flexible membranes for operation of the pumping cassette, andwherein the pressure distribution manifold is configured to provide a valved channel between the positive pressure source and the space between the opposing first and second flexible membranes to facilitate disengagement of the pumping cassette from the base unit.

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