Patent ID: 7112273

Claim:
A device for balancing the flow of fluids in a blood treatment system, comprising: a balancing mechanism having inlets and outlets for a first flow of fluid that includes renal waste and a second flow of fluid including fluid to be infused into a patient; at least one pressure sensor configured to measure a pressure difference between at least one of said inlets relative to a respective outlet; the balancing mechanism employing a volumetric system that is subject to variation in relative flow volume rates due to variations in differences between respective inlet and outlet pressures of said first and second flows; said balancing mechanism configured to receive a compensation signal and adjust a balance between a ratio of said first flow to said second flow responsively to said compensation signal to maintain a correct fluid balance of the patient; a controller configured to generate said compensation signal responsively to at least one pressure measurement by said at least one pressure sensor, said at least one pressure measurement including at least one of said differences between respective inlet and outlet pressures of said first and second flows.