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Methods for detection of respiratory effort and sleep apnea monitoring devices

  • US 9,095,307 B2
  • Filed: 03/14/2014
  • Issued: 08/04/2015
  • Est. Priority Date: 11/07/2012
  • Status: Active Grant
First Claim
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1. A sleep monitoring device comprising:

  • a housing including a region shaped to fit the contours of a patient'"'"'s nose and configured to be disposed on the patient'"'"'s face with said region to be disposed on said nose;

    at least one first sensor to sense physiological information related to the cardiovascular activity of the patient;

    a memory disposed in the housing and configured to store physiological information related to cardiovascular activity of the patient; and

    a processor disposed in the housing, coupled to the at least one first sensor, the processor configured to control the at least one first sensor and to control the memory to store physiological information related to cardiovascular activity of the patient,wherein the processor is further configured to obtain plethysmography data from the stored physiological information, to analyze a DC component of the plethysmography data, to detect changes in a DC component of the plethysmography data, to detect pulse waves in the plethysmography data, to calculate a measure of changes in vascular tone for each detected pulse wave, to adjust dimensions of the measure of the changes in vascular tone to match the detected changes of the DC component of plethysmography data, to scale spectral intensities of the measure of the changes in vascular tone to match the detected changes of the DC component of plethysmography data, and to subtract the adjusted measure of the changes in vascular tone from the DC component of the plethysmography data to obtain the respiratory effort.

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