Method and device for determining the transmembrane pressure...

A - Human Necessities – 61 – M

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A61M 1/16 (2006.01) A61M 1/34 (2006.01)

Patent

CA 2707774

The invention relates to a method for determining the transmembrane pressure during an extracorporeal blood treatment in which blood flows at a defined blood flow rate through an arterial blood conduit 6 of an extracorporeal blood circuit 5A into the inlet of a first chamber 3 of a dialyzer 1, which is divided by a semipermeable membrane 2 into the first chamber and a second chamber 4, and flows through a venous blood conduit 7 from the outlet of the first chamber 3 of the dialyzer 1, while dialysis liquid flows through a dialysis liquid supply conduit 10 into the inlet of the second chamber of the dialyzer and flows through a dialaysis liquid discharge conduit 11 from the outlet of the second chamber of the dialyzer. The method according to the invention and the device according to the invention for determining the transmembrane pressure are such that the pressure on the blood side and on the dialysis liquid side of the dialyzer is measured with relatively little technical outlay, specifically with fewer than four pressure sensors 20, 21, 22, and a preliminary uncorrected value is calculated for the transmembrane pressure and is thereafter corrected by a correction variable that is dependent on a variable correlating with the viscosity of the blood.

L'invention concerne un procédé pour déterminer la pression transmembranaire pendant un traitement extracorporel du sang, selon lequel le sang entre avec un débit d'écoulement donné, par une conduite artérielle 6 d'un circuit sanguin extracorporel 5A, dans un premier compartiment 3 d'un dialyseur 1 divisé par une membrane semi-perméable 2 en ledit premier compartiment et un deuxième compartiment 4, et quitte le premier compartiment 3 du dialyseur 1 par une conduite veineuse 7, tandis que le liquide de dialyse entre dans le deuxième compartiment du dialyseur par une conduite 10 d'apport de liquide de dialyse et quitte le deuxième compartiment du dialyseur par une conduite 11 d'évacuation de liquide de dialyse. Le procédé selon l'invention et le dispositif selon l'invention pour la détermination de la pression transmembranaire se fondent sur le fait que, pour une dépense technique relativement faible, on mesure la pression côté sang et côté liquide de dialyse du dialyseur avec moins de quatre capteurs de pression 20, 21, 22, et on calcule une valeur provisoire non corrigée de la pression transmembranaire, qui est ensuite corrigée par une grandeur de correction qui est fonction d'une grandeur corrélée à la viscosité du sang.

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