Methods for detection of respiratory effort and sleep apnea monitoring devices
First Claim
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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Accused Products
Abstract
A sleep apnea diagnostic system includes a housing that is configured to be attached to near the nose of a patient'"'"'s face to sense physiological information of a patient. The housing includes sensors to sense the physiological information. The physiological information may be, for example, air flow through the nose or the mouth or both. The physiological information further may be, for example, blood volume. The sleep apnea diagnostic system includes at least one processor in the housing or external to the housing or both to analyze the physiological information to determine whether the patient has experienced irregular or abnormal respiratory activity and to detect respiratory effort. The analysis may be real time or delayed.
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Citations
20 Claims
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1. A sleep monitoring device comprising:
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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. - View Dependent Claims (3, 4, 5, 6, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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2. A sleep monitoring device comprising:
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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, the processor further configured to; obtain plethysmography data from the stored physiological information; and
identify respiratory effort by;detecting changes in a DC component of the plethysmography data, detecting pulse waves in the plethysmography data, calculating a measure of changes in vascular tone for each detected pulse wave, via an augmentation index determined by the difference between first and second systolic peaks of the pulse waveform, adjusting dimensions of the measure of the changes in vascular tone to match the detected changes of the DC component of plethysmography data, scaling spectral intensities of the adjusted measure of the changes in vascular tone to match the detected changes of the DC component of plethysmography data; and subtracting the scaled measure of the changes in vascular tone from the DC component of the plethysmography data to obtain the respiratory effort. - View Dependent Claims (7, 8, 9, 10)
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Specification