System for extracorporeal blood treatment

System for extracorporeal blood treatment

  • CN 105,561,416 B
  • Filed: 10/08/2015
  • Issued: 05/15/2020
  • Est. Priority Date: 10/31/2014
  • Status: Active Grant
First Claim
Patent Images

1. A system (1) for extracorporeal blood treatment, the system having:

  • a blood filtration device (2);

    a member (3) for pumping blood through the blood filtration device (2);

    a citrate adding member (4), the citrate adding member (4) being arranged upstream of the blood filtration device (2) in the direction of blood flow, the citrate adding member (4) being configured to add citrate to the blood;

    a calcium addition member (5), the calcium addition member (5) being arranged downstream of the blood filtration device (2) in the direction of blood flow, the calcium addition member being configured to add calcium to the blood; and

    a control unit (6), the control unit (6) being configured to activate or deactivate the citrate adding means (4) and/or the calcium adding means (5);

    wherein the control unit (6) is adapted to;

    -activating the citrate adding means (4) at the beginning of a blood treatment process;

    -determining the lapse of a first time period (t1) after initiating the actual blood treatment;

    -after the first period of time has elapsed, activating the calcium adding means (5) when the total external blood volume in the system has been filtered and citrate treated;

    characterized in that said control unit (6) is further adapted to;

    -continuing to operate the citrate adding means (4) until the end of the actual blood treatment, at which point the citrate adding means (4) is deactivated;

    -continuously operating the calcium adding member (5) in an activated state during the actual blood treatment to stably maintain the user determined calcium adding rate;

    -continuing to operate the calcium adding member (5) in the activated state after the end of the actual blood treatment until a second time period (t2) has elapsed after the end of the actual blood treatment; and

    -setting the length of the second time period (t2) using a time-series feedforward control, using information about the length of the first time period (t1), wherein the second time period (t2) and the first time period (t1) are set by the control unit (6) to be substantially equal to the time it takes for the total external blood volume of the system to run through the entire circuit of the system (1) for an extracorporeal blood treatment once.

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