Patent ID: 7674235

Claim:
A dialyser comprising a haemo-dialyser and/or a haemo-filter, an extra-corporal blood circuit with a component configured to add citrate to the blood connected upstream of the haemo-dialyser and/or of the haemo-filter, a component configured to add a substitution solution containing ions to the blood connected downstream of the haemo-dialyser and/or of the haemo-filter, a dialysate line having a detection element configured to detect an ion concentration in the dialysate downstream of the haemo-dialyser and/or of the haemo-filter with respect to the direction of flow of the dialysate, and a PH component connected to the dialysis line downstream of the dialyser and upstream of the detection element with respect to said direction of dialysate flow, said pH component configured to add, during use of the dialyzer, an amount of acid by which the PH of the dialysate is lowered to prevent complexing of the ion for which said ion concentration is being determined.