Patent ID: 8480609

Claim:
An apparatus for extracorporeal blood treatment comprising: a blood treatment device having a blood chamber, a fluid chamber, and a semipermeable membrane separating the blood chamber from the fluid chamber; a used fluid line configured to connect the fluid chamber to a used fluid discharge; a first actuator predisposed in the used fluid line, the first actuator being configured to control a pressure and/or a fluid flow rate in the fluid chamber; a second actuator arranged in the used fluid line between the first actuator and the used fluid discharge, the second actuator being configured to control a pressure in an intermediate tract of the used fluid line, said intermediate tract being comprised between the first actuator and the second actuator; wherein the apparatus further comprises: a first pressure sensor configured to emit a pressure signal indicating a pressure in said intermediate tract of the used fluid line; a control unit programmed for controlling the second actuator as a function of said pressure signal; one or more fluid containers each having a respective outlet, the apparatus also comprising one or more fluid lines connecting said intermediate tract to each respective outlet; wherein the one or more fluid containers comprise an ultrafilter having a retentate chamber connected to a source of fluid to be ultrafiltrated, a filtered fluid chamber connected to an inlet of the fluid chamber, and a semipermeable membrane which separates the retentate chamber from the filtered fluid chamber, said respective outlet of the ultrafilter being an outlet of the retentate chamber.