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Method for checking the operation of sensors situated in a dialysis liquid circuit

  • US 5,399,157 A
  • Filed: 07/06/1993
  • Issued: 03/21/1995
  • Est. Priority Date: 07/06/1992
  • Status: Expired due to Term
First Claim
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1. A method for checking operation of at least one sensor situated in a dialysis liquid circuit of an artificial kidney, the artificial kidney including an exchanger with two compartments separated by a semi-permeable membrane, one compartment being connected to the dialysis liquid circuit while another compartment is intended to be connected to an extracorporeal blood circuit, the method comprising the steps of:

  • circulating a noncorporeal reference liquid having a known characteristic value in the extracorporeal blood circuit;

    circulating a dialysis liquid in the dialysis liquid circuit and measuring a first value upstream and downstream from the exchanger;

    varying a composition of the dialysis liquid, and measuring a second value upstream and downstream from the exchanger for the varied composition;

    calculating a characteristic value of the reference liquid on the basis of said first and second values;

    comparing the calculated characteristic value with the known characteristic value of the reference liquid; and

    determining that said sensor is functioning properly when the calculated characteristic value is substantially equal to the known characteristic value.

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