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Dialysis system with cassette based balance chambers and volumetric pumps

  • US 9,005,152 B2
  • Filed: 09/17/2010
  • Issued: 04/14/2015
  • Est. Priority Date: 11/05/2003
  • Status: Active Grant
First Claim
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1. A dialysis system comprising:

  • a fresh dialysis fluid membrane pump;

    a spent dialysis fluid membrane pump;

    a first fresh fluid flow path;

    a first spent fluid flow path;

    a second fresh fluid flow path;

    a second spent fluid flow path;

    a first balance chamber including a first rigid portion and a second rigid portion, and a flexible sheet located between the first and second rigid portions, the flexible sheet dividing the first balance chamber into (i) a fresh dialysis fluid compartment connected fluidly to the fresh dialysis fluid membrane pump via the first fresh fluid flow path, wherein fresh dialysis fluid contacts the first rigid portion and a first side of the flexible sheet, and (ii) a spent dialysis fluid compartment connected fluidly to the spent dialysis fluid membrane pump via the first spent fluid flow path, wherein spent dialysis fluid contacts the second rigid portion and a second side of the flexible sheet;

    a second balance chamber including a first rigid portion and a second rigid portion, and a flexible sheet located between the first and second rigid portions, the flexible sheet dividing the second balance chamber into (i) a fresh dialysis fluid compartment connected fluidly to the fresh dialysis fluid membrane pump via the second fresh fluid flow path, wherein fresh dialysis fluid contacts the first rigid portion and a first side of the flexible sheet, and (ii) a spent dialysis fluid compartment connected fluidly to the spent dialysis fluid membrane pump via the second spent fluid flow path, wherein spent dialysis fluid contacts the second rigid portion and a second side of the flexible sheet; and

    a dialysis fluid cassette carrying and in fluid communication with the first and second balance chambers, the dialysis fluid cassette including a fluid receiving portion for the fresh dialysis fluid membrane pump and a fluid receiving portion for the spent dialysis fluid membrane pump, wherein the first and second fresh fluid flow paths and the first and second spent fluid flow paths are provided by the dialysis fluid cassette.

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