Patent ID: 7894890
Filing Date: 2011-02-22
Classification: A61B,A61N

Abstract:
1. An implantable 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 based on a local maximum amplitude and a subsequent local minimum amplitude, or based on a local minimum amplitude and a subsequent local maximum amplitude, configured to determine a duration and an amplitude of each half wave of the plurality of detected half waves, configured to determine, for each half wave, whether the duration is within a range of a plurality of different duration ranges, and whether the amplitude of said half wave is within a range of a plurality of different amplitude ranges, each different duration range having a preset minimum duration threshold and a preset maximum duration threshold, each different amplitude range having a preset minimum amplitude threshold and a preset maximum amplitude threshold, configured, for each duration range of the plurality of different duration ranges, to count a number of occurrences of half waves within said each duration range for each amplitude range of the plurality of different amplitude ranges, and configured to determine a detection of an occurrence of the at least one sleep state or stage if the number of occurrences of half waves within specified amplitude ranges and specified duration ranges correspond to the at least one sleep state or stage.