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Dialysate conductivity adjustment in a batch dialysate preparation system

  • US 5,932,110 A
  • Filed: 12/09/1996
  • Issued: 08/03/1999
  • Est. Priority Date: 02/13/1995
  • Status: Expired due to Term
First Claim
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1. A method of adjusting the conductivity of a batch of dialysate in a dialysis machine, said machine having a substantially noncompliant, closed volume dialysate solution flow path comprising a dialysate solution tank for storing said batch of dialysate and a dialysate circuit conducting said dialysate from said dialysate solution tank to a dialyzer, said dialysate solution flow path having a predetermined estimated volume, comprising the steps of:

  • opening one or more batch chemical vessels containing concentrated dialysate solution chemicals and introducing substantially the entire contents of said concentrated dialysate solution chemicals to said tank, said entire contents of said concentrated dialysate solution chemicals in said batch chemical vessels intentionally overfilled in excess of the amount required to prepare a batch of dialysate at a predetermined desired conductivity level, said predetermined desired conductivity level associated with a dialysis prescription for a patient being dialyzed by said machine;

    thereafter mixing said dialysate solution chemicals with water to form a dialysate solution;

    measuring the conductivity of said dialysate solution;

    calculating, from said measured conductivity, predetermined estimated volume and predetermined desired conductivity level, a volume of water needed to be added to said dialysate solution to dilute said dialysate solution to at least approximate said predetermined desired conductivity level;

    introducing said volume of water into said dialysate solution flow path;

    mixing said volume of water with said dialysate solution to thereby dilute said dialysate solution and lower the conductivity of said dialysate solution to said predetermined desired conductivity level, and subsequentlydraining a quantity of said dialysate solution from said dialysate solution flow path.

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