Patent ID: 6793827
Filing Date: 2004-09-21
Classification: A61M,B01F,Y10S

Abstract:
Method for extracorporeal treatment of blood comprising the following steps:preparing a treatment liquid from a liquid, such as water, and two concentrated solutions, comprising the following steps: circulating the liquid in a preparation conduit, at a flowrate Q0, injecting into the preparation conduit, at a flowrate Q1, a first concentrated solution containing at least a first ionic substance A and a second ionic substance B, the ionic substance B having, in the first concentrated solution, a first concentration, injecting into the preparation conduit, at a flowrate Q2, a second concentrated solution containing at least the first ionic substance A, the second ionic substance B having, in the second concentrated solution, a second concentration [B2sol] different than the first concentration [B1sol] in the first concentrated solution, and regulating the injection flowrate Q1 of the first concentrated solution and the injection flowrate Q2 of the second concentrated solution in such a way that at any given time the diluted solution resulting from the mixing of the liquid and the concentrated solutions has a desired concentration [Ades] of the first ionic substance A and a desired concentration [Bdes] of the second ionic substance B; supplying the treatment liquid to an inlet of a membrane exchanger; removing a spent liquid from an outlet of the membrane exchanger; measuring the concentration of the second ionic substance B in the treatment liquid; and measuring the concentration of the second ionic substance B in the spent liquid, wherein the injection flowrates Q1 and Q2 are regulated on the basis of the concentrations of the second ionic substance B measured in the treatment liquid and in the spent liquid.