Patent ID: 11872335
Assignee: GAMBRO LUNDIA AB
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 14:
15. An apparatus for extracorporeal blood treatment comprising:
a filtration unit having a primary chamber and a secondary chamber separated by a semi-permeable membrane;
a blood withdrawal line connected to an inlet of the primary chamber;
a blood return line connected to an outlet of the primary chamber, said blood withdrawal line and said blood return line configured for connection to a patient cardiovascular system;
a dialysis supply line connected to an inlet of the secondary chamber;
a dialysis effluent line connected to an outlet of the secondary chamber;
a preparation device for preparing a dialysis fluid connected to said dialysis supply line and comprising a regulator for regulating a composition of the dialysis fluid; and
a control unit connected to the regulator and programmed for obtaining a proposed value of a first parameter for the dialysis fluid in the dialysis supply line, the first parameter being one of a conductivity for the dialysis fluid, a conductivity-related parameter for the dialysis fluid, a concentration of at least a substance for the dialysis fluid, or a concentration-related parameter of the at least a substance for the dialysis fluid, said control unit being configured for determining a set value for the first parameter as a function of the proposed value for the first parameter,
wherein, for at least an interval of proposed values for the first parameter, the control unit is configured to determine the set value so that the set value is different from the proposed value by a delta that causes the control unit to deviate from running an isotonic dialysis, an isonatremic dialysis, or an isonatrikalemic dialysis, and so that distinct set values are determined from distinct proposed values, said delta increasing as the proposed value moves away from a predetermined value for the first parameter,
wherein said predetermined value for the first parameter is chosen from the group consisting of:
an average pre-dialysis plasma conductivity for the patient or for a patient population,
an average pre-dialysis plasma sodium concentration for the patient or for the patient population, and
a constant value greater than or equal to 130 mmol/L and less than or equal to 143 mmol/L, and
wherein said delta is positive when the proposed value is lower than the predetermined value for the first parameter and said delta is negative when the proposed value is higher than the predetermined value for the first parameter.