Patent ID: 6966979

Claim:
An infusion control device for controlling infusion of a liquid in an extracorporeal blood circuit, comprising: an arterial pipe connected to an inlet of a blood compartment of a filter, the arterial pipe being also connected to a pre-dilution pipe of an infusion circuit; a venous pipe connected to an outlet of the blood compartment, the venous pipe being also connected to a post-dilution pipe of said infusion circuit; and a control unit configured to control the distribution of an infusion flow rate in said arterial and venous pipes based on a monitoring of at least one quantity correlated with the operating conditions of the filter; wherein said quantity comprises a transmembrane pressure value; and wherein said transmembrane pressure value includes a mean trans-membrane value: TMP ave =[TMP i −TMP o ]/2 calculated from four pressures measured at the inlet and outlet of the blood compartment and at the inlet and outlet of a dialysis liquid compartment of the filter, wherein, TMP i is the inlet transmembrane pressure value, which is equal to the difference between the pressure value at the inlet of the blood compartment and the pressure value at the outlet of the dialysis liquid compartment, and TMP o is the outlet transmembrane pressure value, which is equal to the difference between the pressure value at the outlet of the blood compartment and the pressure value at the inlet of the dialysis liquid compartment.