Method for determining dialysance and an apparatus for this...

A - Human Necessities – 61 – M

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A61M 1/16 (2006.01)

Patent

CA 2336923

According to the inventive method for determining the dialysance of a dialysis machine during an extracorporeal blood treatment, the concentration of a par-ticular substance in the dialysis liquid is altered in the channel of the dialysis liquid, upstream of the dialysis machine. The concentration of said substance is al-tered based on a predetermined starting value and then restored to the starting value. The concentration of the substance in the dialysis liquid is measured with a mea-suring device (17, 18) located upstream or downstream of the dialysis machine. The quotient from the integral of the difference between the outgoing concentration in the dialysis liquid cdo(t) and the predetermined starting value cdol over time and the integral of the difference between the incoming concentration in the dialysis liq-uid cdi(t) and the starting value cdil over time is cal-culated in an evaluation and arithmetic unit (23) and the dialysance is then determined based on the quotient calculated and the flow rate Qd of the dialysis liquid in the channel of the dialysis liquid.

Afin de déterminer la dialysance d'un dialyseur au cours d'un traitement sanguin extracorporel, la concentration d'une substance déterminée contenue dans le liquide du dialyseur est modifiée dans le parcours dudit liquide, en amont du dialyseur, à partir d'une valeur initiale prédéfinie et est ramenée à cette valeur initiale. La concentration de la substance dans le liquide du dialyseur est mesurée avec un dispositif de mesure (17, 18) placé en amont ou en aval dudit dialyseur. Le quotient de l'intégrale de la différence entre la concentration de sortie du liquide du dialyseur cdo(t) et la valeur initiale prédéfinie cdo1 au fil du temps, de même que le quotient de l'intégrale de la différence entre la concentration initiale du liquide du dialyseur cdi(t) et la valeur initiale cdi1 au fil du temps sont mesurés dans une unité d'évaluation et de calcul (23). La dialysance D est déterminée sur la base des quotients obtenus et du débit Qd du liquide du dialyseur, dans le parcours du liquide du dialyseur.

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