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Method and apparatus for detecting access recirculation

  • US 7,955,291 B2
  • Filed: 08/27/2009
  • Issued: 06/07/2011
  • Est. Priority Date: 10/23/1998
  • Status: Expired due to Fees
First Claim
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1. A method of detecting access recirculation, comprising:

  • removing a first fluid flow at a first fluid flow rate from a fluid flow access at a removal position to an external flow circuit comprising a dialyzer having a dialysis fluid inlet and a dialysis fluid outlet and having a semipermeable membrane, said first fluid flow passing along said membrane at one side thereof and a dialysis fluid being emitted from the other side thereof, and returning said first fluid flow from said external flow circuit to said access at a return position downstream of said removal position;

    measuring a first variable which is essentially proportional to a concentration of a substance in said dialysis fluid emitted from the dialyzer;

    changing the first fluid flow rate;

    monitoring the concentration of said substance in the dialysis fluid emitted from the dialyzer; and

    detecting a possible access recirculation by correlating a change in said concentration to said change of the first fluid flow rate.

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