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Vigilance monitoring system

  • US 6,575,902 B1
  • Filed: 07/26/2001
  • Issued: 06/10/2003
  • Est. Priority Date: 01/27/1999
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining a vigilance state of a subject, said apparatus comprising:

  • a first sensor capable of being operatively coupled to a subject wherein said first sensor monitors at least one physiological variable of said subject and provides a first output signal related to said at least one physiological variable;

    a second sensor capable of being operatively coupled to the subject and wherein said second sensor monitors the at least one physiological variable of said subject and provides a second output signal related to said at least one physiological variable of the subject;

    a computer processor for receiving said first and second output signals wherein said computer processor compares the first and second output signals to a reference data set, said reference data set being related to the at least one physiological variable of said subject and having been obtained when said subject is in a relaxed or a fatigued physiological state, to generate a data set representing a physiological state of said subject corresponding to said at least one physiological variable of the subject; and

    a threshold vigilance state signal set to a low vigilance state in the event that said data set decreases below a predetermined low vigilance state threshold value.

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