Patent ID: 9610393
Date: 2017-04-04
CPC Classifications: A61M,B01D,C02F

Claim:
1. An extracorporeal blood treatment apparatus comprising: at least a main treatment unit comprising a first compartment and a second compartment separated by a semipermeable membrane, a blood withdrawal line for blood to be treated connected to an inlet of the first compartment of the main treatment unit, a blood return line connected to an outlet of the first compartment of the main treatment unit, wherein the blood return line, the blood withdrawal line and the first compartment are part of an extracorporeal blood circuit, at least an auxiliary treatment unit comprising at least one fluid inlet and at least one fluid outlet, wherein the auxiliary treatment unit comprises a semipermeable membrane dividing said auxiliary treatment unit into a first chamber and a second chamber, the at least one fluid inlet communicating with the first chamber and the at least one fluid outlet communicating with the second chamber, wherein at least a portion of fluid entering the first chamber passes through the semipermeable membrane into the second chamber and exits the second chamber through the at least one fluid outlet, a first fluid line having a first end connected to an outlet of the second compartment of the main treatment unit and a second end connected to the fluid inlet of the auxiliary treatment unit, a second fluid line having a first end connected to the fluid outlet of the auxiliary treatment unit and a second end connected to said extracorporeal blood circuit, a fluid flow regulator on at least one of said first and second fluid lines, at least one sensor for determining a parameter related to a pressure drop across said auxiliary treatment unit and emitting a corresponding pressure signal, wherein said pressure drop represents a transmembrane pressure across said semipermeable membrane of the auxiliary treatment unit, and a control unit configured to execute a control procedure for a treatment time for a single patient that comprises: wherein the molecular permeability of the membrane of the main treatment unit is greater than the molecular permeability of the membrane of the auxiliary treatment unit, wherein the difference in cut-off value between the membrane of the main treatment unit and the membrane of the auxiliary treatment unit lies between about 10,000 Daltons and about 30,000 Daltons.