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Electrical measuring system particularly useful for the non-invasive examination of biological tissue

  • US 4,540,002 A
  • Filed: 09/30/1982
  • Issued: 09/10/1985
  • Est. Priority Date: 04/22/1982
  • Status: Expired due to Fees
First Claim
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1. A system particularly useful for the non-invasive examination of biological tissue comprising a first group of electrodes adapted to be applied to one portion of the subject under examination;

  • a second group of electrodes corresponding to those of said first group, and adopted to be applied to another portion of the subject under examination to serve as a reference with respect thereto, each said group, comprising;

    a first pair of electrodes, constituting excitational electrodes, adapted to be applied to the respective portion of the subject under examination in spaced relationship to each other and to be connected to a source of constant-amplitude current;

    a second pair of electrodes, constituting sensing electrodes, adapted to be applied to the respective portion of the subject under examination in alignment with, and in the space between, the respective first pair of excitational electrodes, and in spaced relationship to each other, so as to measure the impedance of the respective portion of the subject under examination by measuring the voltage drop between said sensing electrodes;

    a third pair of electrodes, constituting focusing electrodes, adapted to be applied to the respective portion of the subject under examination in alignment with, and on opposite sides of, one of the respective excitational electrodes, transversely of the line between the respective two excitational electrodes, and connected to said one excitational electrode such that the potential of the focusing electrodes follows that of the respective one excitational electrode;

    and synchronized switching means for alternatively connecting said first pair of electrodes to an excitation source while disconnecting said second pair therefrom, and then connecting said second pair of electrodes to said excitation source while disconnecting said first pair of electrodes therefrom.

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