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Device and method for the determination of dry weight by continuous measurement of resistance and calculation of circumference in a body segment using segmental bioimpedance analysis

  • US 7,801,598 B2
  • Filed: 10/07/2005
  • Issued: 09/21/2010
  • Est. Priority Date: 08/14/2000
  • Status: Expired due to Fees
First Claim
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1. A method for determining a dialysis patient'"'"'s dry weight comprising the steps of:

  • continuously measuring the extracellular resistance of a body segment using a plurality of electrodes, while applying a pressure to the body segment, during dialysis and graphing the ratio of R0/Rt as a function of time, wherein R0 is the extracellular resistance at the start of dialysis and Rt is the extracellular resistance as a function of time;

    using a microprocessor to perform each of the following steps;

    flattening the graph of the ratio of R0/Rt as a function of time;

    comparing the patient'"'"'s normalized resistivity as a function of time (ρ

    N(t)) to a minimum level of normalized resistivity in healthy subjects (ρ

    N,H);

    identifying the time at which the dry weight of the patient has been achieved when
    ρ

    N(t)≧

    ρ

    N,H; and

    calculating the patient'"'"'s dry weight.

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