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Method for determining a treatment parameter on a haemofiltration device, and haemofiltration device for applying the method

  • US 6,939,471 B2
  • Filed: 03/21/2003
  • Issued: 09/06/2005
  • Est. Priority Date: 03/19/2002
  • Status: Expired due to Term
First Claim
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1. A method for determining a treatment parameter on a haemofiltration device having a blood cleansing element divided into first and second chambers by a semipermeable membrane, said first chamber forming part of an ultrafiltrate outlet system and said second chamber forming part of an extracorporeal blood circulation system, the device also having a substitution-fluid addition system with which substitution fluid can be added to the extracorporeal blood circulation system, the method comprising the steps of:

  • determining a fluid flow Qo led away from the first chamber;

    determining a first physical-chemical characteristic Cs1 in the substitution fluid and a corresponding first physical-chemical characteristic Cf1 in the fluid led away;

    changing the physical-chemical characteristic Cs in the substitution fluid;

    determining a second physical-chemical characteristic Cs2 in the substitution fluid and a second corresponding physical-chemical characteristic Cf2 in the fluid led away; and

    determining a treatment parameter from the determined values of the fluid flow Qo led away, the physical-chemical characteristics Cs1 and Cs2 in the substitution fluid, and the physical-chemical characteristics Cf1 and Cf2 in the fluid led away.

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