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

Claim 0:
1. 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 cardiovascular system of a patient;
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 one substance for the dialysis fluid, a concentration-related parameter of the at least one substance for the dialysis fluid,
wherein the control unit is configured for either calculating the proposed value for the first parameter or receiving the proposed value as an input, said proposed value for the first parameter including a substance concentration set point or a conductivity set point for running an isotonic dialysis, an isonatremic dialysis, or an isonatrikalemic dialysis,
wherein the control unit is configured to determine 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, and so that distinct set values are determined from distinct proposed values,
wherein, for at least said interval of proposed values for the first parameter, the control unit is configured to determine the set value for the first parameter so that the set value differs from the proposed value by a delta that causes the control unit to deviate from running the isotonic dialysis, the isonatremic dialysis, or the isonatrikalemic dialysis, said delta increasing as the proposed value moves away from a predetermined value for the first parameter,
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, and
wherein the control unit drives the regulator for regulating the conductivity or the concentration of the at least one substance in the dialysis fluid, the control unit setting the first parameter for the dialysis fluid in the dialysis supply line at the set value of the first parameter calculated by the control unit.