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Devices and methods for monitoring physiological information relating to sleep with an implantable device

  • US 8,538,514 B2
  • Filed: 01/02/2013
  • Issued: 09/17/2013
  • Est. Priority Date: 02/09/2007
  • Status: Active Grant
First Claim
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1. An active implantable medical device for monitoring physiological information relating to sleep comprising:

  • at least one sensor configured to sense physiological information; and

    a processor coupled to the at least one sensor and configured to process the physiological information to detect at least one sleep state or stage, the processor;

    configured to detect a plurality of half waves in the sensed physiological information;

    wherein each detected half wave is characterized by a half wave amplitude and a half wave duration;

    configured to sort each detected half wave into one of a plurality of bins in a histogram based on whether each half wave amplitude falls between a predetermined minimum amplitude and a predetermined maximum amplitude and whether each half wave duration falls between a predetermined minimum duration and a predetermined maximum duration;

    configured to associate at least some of the histogram bins with a unique frequency band;

    configured with a histogram counter to keep track of a time interval over which the detected half waves are sorted; and

    configured to determine whether the sensed physiological information is representative of a sleep state based on the density of detected half wave in the one or more unique frequency band histogram bins.

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