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Apparatus for detecting bioelectric signals

  • US 4,940,060 A
  • Filed: 09/09/1987
  • Issued: 07/10/1990
  • Est. Priority Date: 09/09/1986
  • Status: Expired due to Term
First Claim
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1. An apparatus for stimulating and detecting bioelectric signals, comprising:

  • a detecting electrode, adapted to detect electrical signals when in contact with the skin of a patient at chosen acupoints on the body of the patient;

    a reference electrode adapted to be held against the skin of a patient and the couple stimulating signals into the skin of the patient at a fixed reference point on the center line of the patient;

    an amplifying circuit means connected to said detecting electrode for amplifying micro-current signals in the range of 10-11 and 10-4 amperes detected thereby;

    a stimulating signal generating circuit means connected to said reference electrode for applying a stimulating voltage to the skin of the patient at said fixed reference point on the center line of the body of the patient;

    wherein said detecting electrode, reference electrode, amplifying circuit means, and stimulating signal generating circuit means form a stimulating and detecting circuit means for stimulating and detecting bioelectric signals;

    the apparatus further comprising a signal processing circuit means connected to the output of said amplifying circuit means for processing the output signals; and

    output means connected to the output of said signal processing circuit means for displaying the processed output signals;

    wherein said amplifying circuit means comprises;

    a logarithmic micro-current amplifier;

    a temperature compensating circuit; and

    an inverting circuit;

    wherein said logarithmic micro-current amplifier has an input connected to said detecting electrode, and an output connected to an input of said temperature compensating circuit which has an output connected in turn to the input of said inverted circuit, and the output of the inverting circuit is provided to the input of said signal processing circuit means, whereby a detected micro-current in the range of 10-11 -10-4 amperes is amplified to provide an output signal proportional to the negative logarithm of said micro-current.

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