Method and device for sleep monitoring
First Claim
1. A method of detecting a minimum of one breathing parameter that is characteristic for the breathing status of a sleeping individual, comprising the following steps:
- measurement of the derivative trend with respect to time of a minimum of one variable of state of the cardiovascular system of the individual, which variable changes recurrently during respiration, determination of breath-to-breath intervals, each of which represents the duration of one breath, based on the results of the measurement, and determination of the breathing parameter which is identified by the variability of the breath-to-breath intervals in phases of unobstructed breathing and/or statistical variables derived therefrom.
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Abstract
A method of identifying a minimum of one breathing parameter which is characteristic for the breathing status of a sleeping individual comprises the following steps: measurement of the derivative trend with respect to time of a minimum of one variable of state of the cardiovascular system of the individual, which variable recurrently changes with the respiration; determination of breath-to-breath intervals, each of which represents the duration of one breath, from the results of the measurement; and identification of the breathing parameter which is defined by the variability of the breath-to-breath intervals in phases of unobstructed breathing and/or statistical variables derived therefrom. In addition, applications of the method of controlling breathing apparatuses and of signaling breathing statuses of sleeping individuals as well as devices for implementing the methods are described.
88 Citations
19 Claims
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1. A method of detecting a minimum of one breathing parameter that is characteristic for the breathing status of a sleeping individual, comprising the following steps:
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measurement of the derivative trend with respect to time of a minimum of one variable of state of the cardiovascular system of the individual, which variable changes recurrently during respiration, determination of breath-to-breath intervals, each of which represents the duration of one breath, based on the results of the measurement, and determination of the breathing parameter which is identified by the variability of the breath-to-breath intervals in phases of unobstructed breathing and/or statistical variables derived therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12)
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10. A method of analyzing the rhythm of measured variables of state of the cardiovascular system of an individual, which variables change over time in correlation with the respiration, comprising the following steps:
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time filtering of measured breath-to-breath intervals with determination of all breath-to-breath intervals which are shorter than a predetermined threshold value and in which respiration is unobstructed, statistical analysis of the filtered breath-to-breath intervals, with the determination of statistical variables which are characteristic for the frequency distribution of the duration of the breath-to-breath intervals, and output, display and/or storage of the determined statistical variables as breathing parameters. - View Dependent Claims (11, 14, 15, 17)
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13. A device for artificially ventilating a patient and/or for signaling sleep stages, comprising:
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a control device (10) which is designed to detect a minimum of one breathing parameter from measured breath-to-breath intervals which is characteristic for the breathing status of a sleeping individual and which comprises a comparator for comparing at least said one breathing parameter to a reference value, with the control device (10) being designed to generate an actuating signal as a function of the result of the comparison, and a breathing apparatus (20) and/or a signaling device (30) which can be controlled with the actuating signal. - View Dependent Claims (16, 18, 19)
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Specification