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Early detection of low bicarbonate level

  • US 8,906,240 B2
  • Filed: 08/29/2011
  • Issued: 12/09/2014
  • Est. Priority Date: 08/29/2011
  • Status: Active Grant
First Claim
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1. A method performed by data processing apparatus of a dialysis machine, the method comprising:

  • receiving a first signal from a conductivity detector connected to a line through which a solution of bicarbonate and fluid flows to a dialyzer of the dialysis machine, wherein the fluid flows from a fluid source, through a fluid line segment connected to the fluid source and the line, to the line;

    determining a first conductivity of the solution based on the first signal;

    receiving a second signal from the conductivity detector at a time after receiving the first signal;

    determining a second conductivity of the solution based on the second signal; and

    determining that solid bicarbonate in a container through which the solution flows is approaching a level insufficient to maintain the solution at a conductivity suitable for flowing though the dialyzer, based on a determination that the second conductivity is less than the first conductivity by at least a threshold amount.

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