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Electroencephalograph instrument for mass screening

  • US 5,287,859 A
  • Filed: 09/25/1992
  • Issued: 02/22/1994
  • Est. Priority Date: 09/25/1992
  • Status: Expired due to Term
First Claim
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1. An electroencephalographic (EEG) system comprising:

  • (a) a plurality of EEG electrodes, including a fiducial electrode, adapted to be removably secured to the scalp of the patient, each EEG electrode being a portion of a brain wave signal channel;

    (b) an amplifier means to amplify the analog microvolt level brain wave signals from the EEG electrodes in each brain wave channel, the amplifier means consisting of a plurality of fewer amplifiers than two-thirds the number of the EEG electrodes;

    (c) electronic switching means to sample the larger number of electrodes by the smaller number of amplifiers;

    (d) an analog/digital converter connected to the amplifiers to produce therefrom EEG data consisting of amplified and digitized brain wave signals;

    (e) a micro-processor based computer system means connected to the analog/digital converter to analyze the EEG data;

    (f) a patient stimulator means connected to and controlled by the computer system means to provide a selected pattern of stimulation to the patient to evoke the patient'"'"'s brain wave responses in a set of evoked potential tests, each test being the brain wave evoked responses at a selected frequency range and at a selected electrode to a selected simulation;

    g) a computer memory means connected to the computer system means to store the test scores of normal groups to a set of evoked potential tests corresponding to the evoked potential tests given to the patient;

    (h) test score pair comparison means in the computer system means to form at least 24 pairs of test scores, each pair comprising two test scores from duplicated tests;

    to compare one test score of each pair with the other test score of the same pair, and to accept for further analysis only those pairs in which the two test scores of the pair are sufficiently alike within a predetermined definition;

    (i) normal comparison means in the computer system to compare accepted pairs of test scores with the normal group test scores of (g) and to identify, as being abnormal, those accepted pairs of test sources which are significantly deviant from the normal group test scores of (g);

    (j) signal means to signal the finding by (i) of abnormal test scores of the patient.

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