Patent ID: 8771215

Claim:
A machine for extracorporeal blood treatment, comprising: a blood treatment device having a blood chamber and a fluid chamber, separated one from another by the semipermeable membrane, an extracorporeal blood circuit which comprises an arterial line, for taking blood removed from a patient to an inlet of the blood chamber, and a venous line, for returning treated blood from an outlet of the blood chamber to the patient, a device for ultrafiltration of a liquid through the semipermeable membrane of the blood treatment device, an infusion line connected to the extracorporeal blood circuit and provided with an infusion actuator for injecting into the extracorporeal blood an infusion flow of substitution liquid, a controller configured to perform the following operations: changing a transmembrane pressure across the semipermeable membrane of the blood treatment device; detecting a plurality of values of an infusion flow rate through said infusion line on changing said transmembrane pressure; and evaluating an optimal value of said infusion flow rate from a comparison of said plurality of values, the optimal value comprising at least one of equal to, and proximal to a maximum value of infusion flow rate through said infusion line as a function of said transmembrane pressure.