Patent ID: 8068904
Filing Date: 2011-11-29
Classification: A61B,A61N

Abstract:
1. A method for monitoring physiological information relating to sleep comprising: sensing physiological information; detecting 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; determining a duration and an amplitude of each half wave of the plurality of detected half waves; determining, 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; for each duration range of the plurality of different duration ranges, counting a number of occurrences of half waves within said each duration range for each amplitude range of the plurality of different amplitude ranges; and determining a detection of an occurrence of 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.