Patent ID: 7875168

Claim:
An apparatus for extracorporeal blood treatment, comprising: at least one blood treatment unit having a first chamber and a second chamber separated by a semi-permeable membrane; an extracorporeal circuit for circulation of blood, said extracorporeal circuit comprising a blood removal branch and a blood return branch, said blood removal branch having an end destined to be connected with a cardiovascular system of a patient and another end in communication with an inlet of said first chamber, said blood return branch having an end destined to be connected to a cardiovascular system of a patient and another end in communication with an outlet of said first chamber; first movement means operating on a post-infusion tract of said blood removal branch, said first movement means causing a flow of liquid across said extracorporeal circuit; an infusion line connected to said blood removal branch at a section thereof located upstream of said post-infusion tract with reference to a blood circulation direction of blood in said extracorporeal circuit; second movement means operating on said infusion line for causing a flow of infusion liquid across the infusion line; a blood flow calculation device comprising: a memory for receiving and storing a first datum or a second datum and for receiving and storing a third datum, said first datum relating to a flow of blood removed from the patient, said second datum being the flow of liquid across said post-infusion tract, and said third datum relating to a flow of infusion liquid flowing through said infusion line; first sensor means predisposed to emit a first signal relating to an actual value of the flow of liquid across said post-infusion tract; a user interface predisposed to receive in input said first datum, said first datum comprising a set value of the blood flow removed from the patient; and a control unit connected to said memory and to said user interface, said control unit being programmed to calculate said second datum as a function of said first datum and said third datum, said control unit being connected to said first sensor means, said control unit being programmed to cooperate with the first and second movement means for bringing the actual value of the flow of liquid across said post-infusion tract towards a set value of the flow of liquid across the same post infusion tract or towards said calculated second datum.