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Hemodialysis systems and methods

  • US 8,721,879 B2
  • Filed: 01/18/2013
  • Issued: 05/13/2014
  • Est. Priority Date: 02/27/2007
  • Status: Active Grant
First Claim
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1. A hemodialysis system, comprising:

  • a blood flow path through which untreated blood is drawn from a patient and passed through a dialyzer;

    a dialysate flow path through which dialysate flows from a dialysate supply through the dialyzer, the dialysate flow path and the blood flow path being in fluidic communication;

    a reciprocating positive displacement blood pump configured to pump blood in the blood flow path, resulting in blood flow through the dialyzer;

    a reciprocating positive displacement dialysate pump configured to pump dialysate in the dialysate flow path, resulting in dialysate flow through the dialyzer; and

    a controller configured to receive pressure information associated with the blood flow path and/or pressure information associated with the dialysate flow path, and configured to control the dialysate pump and/or the blood pump;

    wherein the controller uses the pressure information during dialysis to control the dialysate pump and/or the blood pump such that the pressure of the dialysate exiting the dialyzer is lower than the pressure of the blood exiting the dialyzer.

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