Patent ID: 8684959

Claim:
An extracorporeal blood treatment apparatus, comprising: a blood treatment device having a blood chamber and a fluid chamber separated from one another by a semipermeable membrane; an extracorporeal blood circuit connected to the blood chamber for transporting blood from an individual to the blood chamber and for returning the blood from the blood chamber to the individual; a sensor predisposed in the extracorporeal blood circuit for emitting at least a signal indicating a variation in hematic volume of the individual subjected to extracorporeal blood treatment; a weight loss system for actuating an individual's weight loss during the extracorporeal blood treatment; a control unit configured for performing following operations: receiving an effective weight value of the individual; receiving a desired weight loss value of the individual; determining at least a desired value of a hematic volume change of the individual on a basis of the effective weight value and the desired weight loss value, wherein the operation of determining at least a desired value of a hematic volume change comprises sub-operations of: receiving a desired value of a second parameter of the individual, wherein said second parameter is a Refilling Index; calculating a desired value of the individual's parameter on a basis of the desired value of the individual's second parameter, the effective weight value and the desired value of the weight loss by calculating a relative hematic volume change on a basis of the desired value of the individual using formula: Î”BV %=RI*WL % where Î”BV % is the variation in relative hematic volume, i.e. the variation of hematic volume in relation to the total hematic volume, RI is the desired value of the individual's second parameter and WL% is the relative weight loss where the relative weight loss is calculated on a basis of a relation between the desired weight loss and the effective weight of the patient; controlling the weight loss system on a basis of the signal of hematic volume change and the desired value of a parameter of the individual.