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Automatic dialysis method and apparatus

  • US 5,938,938 A
  • Filed: 05/21/1997
  • Issued: 08/17/1999
  • Est. Priority Date: 07/04/1995
  • Status: Expired due to Term
First Claim
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1. Method for automatic dialysis using a dialysis unit which, in service, is connected to a patient undergoing a dialysis treatment, comprising the phases of acquiring allowed values of input parameters and desired values of patient parameters, acquiring actual values of the patient parameters;

  • acquiring actual values of machine parameters; and

    controlling the operation of the dialysis unit using controlled values of the machine parameters to make the patient parameters take on the desired values, wherein;

    the patient parameters comprise the relative variation in blood volume (BV) and the weight loss (WL),the machine parameters comprise the weight loss rate (WLR) and the conductivity of the (CD) dialysis fluid,the phase of acquiring allowed values of the input parameters and desired values of the patient parameters comprises the phases of;

    storing the permitted values of the relative variation in blood volume as a function of the dialysis time;

    storing the permitted values of the weight loss as a function of the dialysis time;

    storing the permitted values of the weight loss rate as a function of the dialysis time;

    storing the permitted values of the conductivity of the dialysis fluid as a function of the dialysis time;

    the phase of acquiring the actual values of the patient parameters comprises the phases of;

    acquiring actual values of the weight loss during the treatment;

    acquiring actual values of the variation in blood volume during the treatment;

    the phase of controlling the operation of the dialysis unit comprises the phases of;

    calculating the operating values of the weight loss rate and of the conductivity of the dialysis fluid; and

    correcting the weight loss rate and the conductivity of the dialysis fluid on the basis of the operating values.

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