US 12,433,977 B2
Device and method for extracorporeal blood treatment and method for the balance control of a dialysis liquid in an extracorporeal blood treatment
Waldemar Janik, Melsungen (DE)
Assigned to B. Braun Avitum AG, Melsungen (DE)
Appl. No. 17/635,869
Filed by B. Braun Avitum AG, Melsungen (DE)
PCT Filed Aug. 21, 2020, PCT No. PCT/EP2020/073532
§ 371(c)(1), (2) Date Feb. 16, 2022,
PCT Pub. No. WO2021/037744, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 10 2019 122 704.6 (DE), filed on Aug. 23, 2019.
Prior Publication US 2022/0288291 A1, Sep. 15, 2022
Int. Cl. A61M 1/16 (2006.01)
CPC A61M 1/1609 (2014.02) [A61M 1/1635 (2014.02); A61M 2205/3303 (2013.01); A61M 2205/3313 (2013.01); A61M 2205/3317 (2013.01); A61M 2205/3368 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A device for extracorporeal blood treatment comprising:
a dialyzer configured to exchange substances between a patient's blood and a dialysis fluid, the dialyzer being connected to a discharge line for discharging used dialysis fluid from the dialyzer;
a proportioning unit configured to provide fresh dialysis fluid, the proportioning unit connected to the dialyzer via a supply line for supplying fresh dialysis fluid;
a first measuring apparatus provided in the supply line for detecting a conductivity of the fresh dialysis fluid;
a second measuring apparatus provided in the discharge line for detecting a conductivity of the used dialysis fluid;
a control unit connected to the proportioning unit, the first measuring apparatus, and the second measuring apparatus for data exchange; and
a third measuring apparatus provided in the discharge line for generating a single value indicative of a sum of all substances that pass from the patient's blood into the dialysis fluid, the third measuring apparatus being connected to the control unit for data exchange,
the control unit being configured to continuously control in open-loop or closed-loop fashion a concentration of a substance in the fresh dialysis fluid provided by the proportioning unit during blood treatment based on conductivities continuously detected during blood treatment by the first measuring apparatus and the second measuring apparatus and the single value indicative of the sum of all substances that pass from the patient's blood into the dialysis fluid generated by the third measuring apparatus in such a way that the concentration of a substance in the fresh dialysis fluid is equal to the concentration of the substance in the used dialysis fluid or is greater or less than the concentration of the substance in the used dialysis fluid by a predetermined value.