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Living body impedance measuring instrument and body composition measuring instrument

  • US 6,393,317 B1
  • Filed: 12/07/1999
  • Issued: 05/21/2002
  • Est. Priority Date: 02/24/1997
  • Status: Expired due to Term
First Claim
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1. A living body impedance measuring instrument comprising:

  • a high frequency current generation source for generating a high frequency current to be applied to a living body;

    a plurality of high frequency current application electrodes electrically connected to the high frequency current generation source for applying the high frequency current to the living body;

    a first switching device electrically connected between the high frequency current generation source and said plurality of high frequency current application electrodes for enabling application of the high frequency current along a current path between different electrodes of said plurality of high frequency current application electrodes;

    a potential difference measuring device electrically connected to the high frequency current generation source for measuring a potential difference between potential difference measuring electrodes;

    a plurality of potential difference measuring electrodes electrically connected to the potential difference measuring device for measuring a potential difference in the living body;

    a second switching device electrically connected between the potential difference measuring device and said plurality of potential difference measuring electrodes, and electrically connected between said plurality of potential difference measuring electrodes and the first switching device, for enabling measurement of potential difference in different parts of said living body; and

    a control and arithmetic device electrically connected to the first and second switching devices, the high frequency current generation source, the potential difference measuring device, whereby said control and arithmetic device controls said first and second switching devices so that they are independently actuated in such a manner that the potential difference on the target part of the living body can be measured, and performs a process for converting a voltage value obtained from said potential difference measuring device into the impedance of said target part;

    said plurality of high frequency current application electrodes including a plurality of electrodes each adapted to contact with each of hands or feet which are extreme parts of the living body; and

    said plurality of potential difference measuring electrodes including a plurality of electrodes each adapted to contact with each of hands or feet which are extreme parts of the living body and along the path of the high frequency current applied to the living body by the high frequency current application electrodes, and at least one electrode adapted to contact any one of connecting parts between the hands or feet and the trunk of the living body, for measuring the living body impedance of an arm or a leg.

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