×

Method and device for monitoring the supply of substitution fluid during an extracorporeal blood treatment

  • US 7,850,856 B2
  • Filed: 11/22/2002
  • Issued: 12/14/2010
  • Est. Priority Date: 12/05/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for monitoring the supply of a substitution fluid during an extracorporeal blood treatment, said method comprising:

  • providing an extracorporeal blood circuit comprising;

    a first chamber of a dialyser, wherein the dialyser is subdivided by a semipermeable membrane into the first chamber and a second chamber;

    providing a fluid system comprising;

    the second chamber of the dialyser,a substitution fluid line connecting to the extracorporeal blood circuit upstream or downstream of the dialyser,a substituate pump on the substitution fluid line to deliver the substitution fluid from the fluid system to the extracorporeal blood circuit upstream or downstream of the dialyser, anda pressure sensor in the fluid system for measuring pressure waves generated by the substituate pump in the upstream direction of the substitution fluid line;

    generating a plurality of pressure waves with the substituate pump;

    measuring the pressure waves in the fluid system with the pressure sensor;

    converting the measured pressure waves into an electrical signal having an amplitude;

    comparing the amplitude to a preset limiting value; and

    determining there is an interruption of the supply of the substitution fluid when the amplitude of the pressure waves exceeds the preset limiting value.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×