EP3860456A1 - Sensorsystem, auswertevorrichtung, verfahren und computerprogrammprodukt zur erfassung des schlafverhaltens eines probanden - Google Patents
Sensorsystem, auswertevorrichtung, verfahren und computerprogrammprodukt zur erfassung des schlafverhaltens eines probandenInfo
- Publication number
- EP3860456A1 EP3860456A1 EP19783472.4A EP19783472A EP3860456A1 EP 3860456 A1 EP3860456 A1 EP 3860456A1 EP 19783472 A EP19783472 A EP 19783472A EP 3860456 A1 EP3860456 A1 EP 3860456A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- concentration
- volatile organic
- organic compounds
- subject
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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- 238000000034 method Methods 0.000 title claims description 13
- 238000004590 computer program Methods 0.000 title claims description 6
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 120
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 83
- 230000000241 respiratory effect Effects 0.000 claims description 27
- 239000012080 ambient air Substances 0.000 claims description 18
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 15
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 15
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- 230000007423 decrease Effects 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 5
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Definitions
- the invention relates to a sensor system, an evaluation device, a method and a computer program product for recording the sleep behavior of a subject.
- the sleep behavior of a subject is determined by various factors.
- various physical disorders or physical influences can (negatively) influence a subject's sleep behavior.
- a disturbance in the subject's breathing activity negatively influenced the subject's sleep behavior.
- Apnea and hypopnea are known in particular as disorders of respiratory activity.
- Apnea means a more or less long suspension of the subject's breathing.
- Hypopnea refers to an event during breathing that causes a decrease in the flow of breath.
- the sleep behavior of a test person is largely characterized by movements of the test person during sleep.
- One aspect of the invention relates to a sensor system for recording the sleep behavior of a test subject, comprising:
- a sensor device for arrangement on the test subject, the sensor device being designed to provide first sensor information comprising a concentration of volatile organic compounds in the ambient air of the sensor device;
- an evaluation device that can be coupled to the sensor device for evaluating the first sensor information provided by the sensor device, the evaluation device being designed to determine a time course of the concentration of the volatile organic compounds and, by means of the time course of the concentration of the volatile organic compounds, the sleep behavior of the test subject to determine.
- the sensor system can be used, in particular, to record the subject's breathing activity during sleep and to identify a respiratory event or a breathing activity event in the recorded breathing activity.
- the recorded breathing activity can include, in particular, the subject's inhalation and / or exhalation activity.
- the sleep behavior of the test person can then be determined via the recorded breathing activity and / or the recognized breathing activity event.
- a human being can be understood as a subject, but animals can also be considered as a subject.
- the sensor device preferably has attachment or fastening means with which the sensor device can be detachably attached or arranged on the subject. Adhesive, adhesive or suction means, for example, can be provided as attachment or fastening means.
- Volatile organic compounds are organic or carbon-containing compounds or substances which, at low temperatures, for example at room temperature, as a gas. Volatile organic compounds are also called “volatile organic compounds" in English and are abbreviated to "VOC". In the context of this disclosure, the formulation “volatile organic compounds” with the English name “volatile organic compounds” or the abbreviation “VOC” can be exchanged. The concentration of volatile organic compounds is stated in ppb (parts per billion or parts per billion) or ppm (parts per million or parts per million)
- the area of the ambient air detected by the sensor device can relate to the concentration of volatile organic compounds present directly on the sensor device, the existing concentration of volatile organic substances in a range of up to 5 cm around the sensor device, a range of up to 10 cm around the sensor device , preferably up to 20 cm around the sensor device, or particularly preferably up to 50 cm around the sensor device.
- the sensor device is preferably designed to detect the concentration of volatile organic substances in the ambient air of the sensor device with a sampling rate.
- the sampling rate can be fixed or can be changed. For example, the concentration of volatile organic compounds in the ambient air can be sampled at a sampling rate of 1 Hz. If the sampling rate is increased, for example to 10 Hz, the accuracy of the first sensor information can be increased. On the other hand, if the sampling rate is reduced, for example to 0.5 Hz, the energy consumption of the sensor device can be reduced.
- a changeable sampling rate enables the sensor device to be optimally adapted to the age and the physique of the test person, which have a significant influence on the test person's breathing frequency. As a result, the sampling rate can be set to a frequency which delivers sufficiently precise results and thereby contributes to energy-efficient operation of the sensor device. In particular, the sampling rate should be at least twice the subject's respiratory rate.
- the Concentration of volatile organic compounds in the ambient air of the sensor device is significantly influenced by the breathing activity of the subject. This increases the concentration of volatile organic compounds in the ambient air of the sensor device when the subject exhales. Because they are volatile organic compounds, the concentration of volatile organic compounds drops immediately after the subject exhales. Thus, by measuring the concentration of the volatile organic compounds in the ambient air of the sensor device or by measuring the time course of the concentration of volatile organic compounds, the breathing activity of the test person can be detected by the sensor system.
- the sensor device is preferably designed to detect the concentration of the volatile organic compounds in the breathing air or exhaled air and / or inhaled air of the test subject.
- the sensor device can have a first sensor which is designed to detect the first sensor information, the first sensor being attachable between the subject's mouth and nose and in particular on the subject's philtrum. That is, the first sensor can preferably be arranged in the air flow generated by the test person's inhalation and / or exhalation air.
- the arrangement of the sensor device or the first sensor on the subject's philtrum is advantageous since the change in the concentration of the volatile organic compound caused by the subject's breathing activity (inhalation / exhalation) can thus be precisely recorded.
- the use of a mask, which is applied to the subject and by means of which the subject's breathing air is passed on to a detection unit, can be dispensed with.
- the proposed solution enables the first sensor information to include information about the concentration of volatile organic compounds in the subject's inhaled and / or exhaled air. It is thus advantageously possible to determine a breathing activity event by means of the time course of the concentration of the volatile organic compound in the inhaled and / or exhaled air.
- the first sensor information provided by the sensor device can, for example, be wireless or wired to that with the sensor device connectable evaluation device are transmitted.
- wireless transmission transmission via wireless LAN, Bluetooth or mobile radio can be used, for example.
- wireless LAN wireless local area network
- Bluetooth or mobile radio can be used, for example.
- proprietary radio standards it is also possible to use proprietary radio standards.
- the transmission can preferably be encrypted.
- the evaluation device determines a time course of the concentration of the volatile organic compounds from the first sensor information provided by the sensor device.
- the evaluation device can determine a time course of the change in the concentration of the volatile organic compounds.
- the evaluation device is preferably designed to determine the breathing activity of the test subject based on the time course of the concentration of the volatile organic compounds or the change in the concentration of the volatile organic compounds.
- the respiratory rate of the subject can be determined on the basis of the time intervals between successive peaks in the concentration of volatile organic compounds.
- a peak is understood as a local maximum in the course of the concentration of volatile organic compounds over time.
- the respiratory rate can be determined on the basis of the time interval between two successive peaks, between which there is a local minimum. The respiratory rate is determined by dividing 1 by the time interval between two peaks.
- the evaluation device is preferably designed to determine a first breathing activity event in the breathing activity of the test subject when the concentration of the volatile organic compounds decreases over a first time period.
- determining whether the first respiratory event occurs For example, at a decrease in the concentration of the volatile organic compounds, which takes place over a period of 8 seconds, preferably over a longer period of time than 8 seconds, the presence of the first breathing activity event is determined.
- the first breathing activity event corresponds to an apnea of the subject.
- the first respiratory event can be determined by the concentration of volatile organic compounds at the end of the time period being below a local minimum that (immediately) preceded the peak.
- the sensor system can determine that the first respiratory event occurs when the concentration of volatile organic compounds at the end of the period is at least 1/10 below the aforementioned local minimum. If the subject has a correspondingly long apnea, the concentration of the volatile organic compounds in the ambient air of the sensor device can substantially approach the concentration of the volatile organic compounds contained in the air.
- the evaluation device is preferably designed to determine a second breathing activity event, different from the first breathing activity event, in the breathing activity of the test subject if the concentration of the volatile organic compounds falls below a threshold value and / or the concentration of the volatile organic compounds fluctuates below the threshold value.
- the threshold depends, among other things, on the concentration of volatile organic compounds in the
- Air surrounding the sensor device is already present without the subject's breathing activity and due to the change in the concentration of volatile organic compounds which occurs during normal breathing activity or breathing of the subject. If this threshold is undershot, the
- the evaluation device determines that hypopnea is present as the second breathing activity event. If hypopnea is present, there is a reduced increase in the concentration of volatile organic compounds compared to normal breathing activity per breathing cycle, i.e. when the subject inhales and exhales. For example, the increase in the concentration of volatile compounds in the presence of hypopnea can be reduced by at least 30% compared to normal breathing.
- the threshold value can preferably be changed so that the determination of the sleeping behavior by the evaluation device can be adapted to the test subject and / or the surroundings.
- the evaluation device is preferably designed to determine a third breathing activity event that is different from the first and the second breathing activity event if the concentration of the volatile organic compounds fluctuates around a threshold value.
- the evaluation device determines that the third breathing activity event, which corresponds to a normal breathing of the test person, is present when the concentration of the volatile organic compounds has an essentially periodic sinusoidal time profile.
- the respiratory rate of the subject can be determined by the evaluation device by means of two peaks or local maxima which follow the concentration of the volatile organic compounds over time. The respiratory rate can be determined in particular by the time interval between the successive peaks or local maxima.
- the evaluation device can in particular be designed to determine the sleep behavior by processing the time course of the concentration of the volatile compounds by means of a spectral analysis.
- the evaluation device can be designed to transform the time course of the concentration of the volatile organic compounds into a spectrum by means of a spectral analysis unit.
- the spectral analysis unit can transform the time course of the volatile organic compounds into a spectrum, for example by means of a (discrete) fast Fourier transformation or wavelet transformation, the present invention not being limited to these transformation processes.
- the evaluation device can break down the time course of the concentration of the volatile compounds into a large number of data segments, with each data segment of the large number of data segments then being fed to the spectral analysis in order to determine a spectrum of the respective data segment.
- the spectra obtained are sent to a classification unit of the Evaluation device transmitted.
- the classification unit is designed to determine whether there is a respiratory event in the spectra.
- the time course of the concentration of the volatile organic compounds can preferably be broken down into data segments of equal size.
- each data segment of the plurality of data segments has the same size.
- the same size is understood to mean the same length in time of the multiplicity of data segments or the same number of measuring points of each data segment.
- the large number of data segments can have a length of 30 seconds.
- the first data segment or the first data segments of the plurality of data segments can have a predefined size.
- the predefined size can be larger than the size of the following data segments.
- the respiratory rate of the test person can be roughly predetermined by the first larger data segment or the first larger data segments. Based on the rough predetermination of the respiratory rate, the size of the following data segments can be determined in order to reduce noise in the spectrum of the respective data segment.
- the sensor system or the evaluation device is preferably designed to output a signal when the evaluation device determines that a first breathing activity event and / or second breathing activity event is present. Based on the signal, the test person can be informed or alarmed, for example, about the presence of a first breathing activity event and / or a second breathing activity event that is critical for the test person.
- the evaluation device is preferably designed to issue a warning if an occurrence of the first respiratory activity event exceeds a first frequency and / or an occurrence of the second respiratory activity event exceeds a second frequency.
- the first frequency and the second frequency can be the same or different.
- the first frequency and the second frequency can each be one present an absolute value or define a value per time span.
- the evaluation device can issue the warning if the first respiratory activity event occurs five times during an hour.
- the warning can be a warning of the test person, for example an acoustic or haptic warning of the user.
- the warning can also optionally or alternatively be information to a help center, for example by making an automated emergency call.
- the first frequency and / or the second frequency can be changed and can be set individually for the test subject.
- the sensor system or the sensor device preferably has a second sensor, which is designed to detect a movement of the subject as second sensor information, and the evaluation device is designed to determine the sleep behavior based on the second sensor information.
- the second sensor can in particular be designed as an inertial measuring system consisting of a position sensor and an acceleration sensor and which is designed to detect an absolute position of the test person in space, the acceleration of a movement of the test person, a rotational speed of the test person and the earth's magnetic field .
- This information can already be provided as second sensor information by the sensor device of the evaluation direction.
- the evaluation device can assess the sleep quality of the test subject based on the second sensor information.
- the sensor system is preferably designed to record at least the following compounds as volatile organic compounds: isoprene, ethanol, methanol, acetone and carbon monoxide.
- the sensor system is designed to detect only the following compounds as volatile organic compounds: isoprene, ethanol, methanol, acetone and carbon monoxide.
- the concentration of the volatile organic compounds is preferably detected as a total concentration of these compounds by the sensor device. This is advantageous since a separate detection and consideration of a concentration of each individual volatile compound can be omitted.
- Another aspect of the invention relates to an evaluation device for determining the sleep behavior of a test subject, the evaluation device being designed: for receiving sensor information comprising a concentration of volatile organic compounds;
- the evaluation device can in particular be designed in accordance with the preceding statements.
- Another aspect of the invention relates to a method for determining a subject's sleep behavior, the method comprising the following steps:
- the method can have one or more of the above statements.
- Another aspect of the invention relates to a computer program product comprising commands which, when the program is executed by a computer, cause the computer to carry out the above method.
- Figure 1 shows schematically the arrangement of a sensor device on a Subjects.
- FIG. 2 shows a sequence of recording the sleep behavior of a test subject.
- FIG. 3 shows an example of the course over time of a detected concentration of volatile organic compounds.
- FIG. 4 shows on the left side the time course of the concentration of volatile organic compounds during a respiratory activity event and on the right side a spectrum corresponding to the time course.
- FIG. 5 shows on the left side the time course of the concentration of volatile organic compounds during a further breathing activity event and on the right side a spectrum corresponding to the time course.
- FIG. 6 shows on the right side the time course of the concentration of volatile organic compounds during another breathing activity event and on the right side a spectrum corresponding to the time course.
- FIG. 7 shows a sequence of recording the sleep behavior of a test subject.
- FIG. 1 shows a sensor device 10 arranged on a test subject, FIG. 1 showing a human being as a test subject.
- the sensor device 10 is worn by the test person on his nose.
- the sensor device 10 also has a voltage source 12, a first sensor 14, a second sensor 16 and a data processing unit 18.
- a connecting element 19 serves to mechanically connect the voltage source 12, the first sensor 14, the second sensor 16 and the data processing unit 18 to one another.
- the voltage source 12 supplies the sensor device 10 with an operating voltage and can preferably have a rechargeable battery.
- the first sensor 14 is designed to detect a concentration of volatile organic To detect connections in its ambient air.
- the first sensor 14 can detect the concentration of volatile organic compounds with a fixed or variable sampling rate.
- the first sensor 14 can detect the concentration of volatile organic compounds in the ambient air with a sampling rate of 1 Hz.
- the sampling rate should be at least twice the subject's breathing rate. It can preferably be provided that the concentration of the volatile organic compounds in the ambient air of the sensor device 10 detected by the first sensor 14 corresponds to a concentration of the volatile organic compounds detected directly on the first sensor 14. In other words, the concentration of volatile organic compounds detected by the first sensor 14 corresponds to a concentration of volatile organic compounds present on the first sensor 14.
- the concentration of volatile organic compounds detected by the first sensor 14 can the existing concentration of volatile organic substances in a range of up to 5 cm around the first sensor 14, a range of up to 10 cm around the first sensor 14, preferably from up to 20 cm around the first sensor 14, or particularly preferably up to 50 cm around the first sensor 14.
- the first sensor 14 is preferably arranged between the subject's nose and mouth, and particularly preferably on the subject's philtrum. This arrangement makes it possible to exactly detect the change in the concentration of the volatile organic compounds in the ambient air of the first sensor 14 caused by the breathing activity of the test subject. In particular, an exhalation of the subject through the nose and / or mouth leads to an increase in the concentration of volatile organic compounds in the ambient air of the first sensor 14.
- the second sensor 16 is designed to detect a position and a movement of the subject.
- the second sensor 16 can in particular be designed to detect an absolute position of the test person in space, acceleration data of a movement of the test person, a rotational speed of the test person and the earth's magnetic field.
- the second sensor 16 is designed as a 9-axis orientation sensor or as an inertial measuring system consisting of a position sensor and an acceleration sensor. It is preferably provided that the second sensor 16 is arranged and / or fastened on the bridge of the nose or the forehead of the test subject.
- the data processing unit 18 is designed, in particular, to record the data measured by the first sensor 14 and the second sensor 16 and to transmit it as first sensor information and second sensor information to an evaluation device 20 (not shown in FIG. 1).
- a suitably configured smartphone or wearable, for example, can be used as the evaluation device 20.
- the transmission of the first sensor information and second sensor information to the evaluation device 20 is preferably wireless, for example via a Bluetooth, WLAN or (mobile) radio connection. However, a wired transmission of the first sensor information and second sensor information from the sensor device 10 to the evaluation device 20 would alternatively also be possible.
- the voltage source 12 and the data processing unit 18 are designed to be arranged on the opposite nostrils of the subject. This results in a compact design of the sensor device 10, which can be easily attached to the test subject. Alternatively, the voltage source 12 and the data processing unit 18 can be arranged or fastened on the subject's forehead.
- the sensor device 10 can in particular be arranged or fastened to the test person using adhesive, adhesive, suction and / or other fastening means.
- adhesive adhesive, suction and / or other fastening means.
- plasters, suction buttons or a fastening clip can be used to fasten the sensor device 10 to the subject.
- the connecting element 19 can be designed to be deformable in order to adapt the sensor device 10 to the anatomy of the subject's nose.
- FIG. 2 shows the sequence of recording the sleep behavior of a subject by the sensor device 10 and the evaluation device 20.
- FIG. 2 illustrates the functions performed by the sensor device 10.
- the block evaluation device 20 illustrates on the other hand, the functions performed by the evaluation device 20.
- the first sensor 14 detects or measures the concentration of volatile organic compounds in the ambient air of the first sensor 14. As shown above, the first sensor 14 can detect or measure the concentration of volatile organic compounds at a specific or variable sampling rate . measure up. The first sensor 14 then forwards the measured data to the data processing unit 18.
- a data preprocessing S210 of the measured data can be carried out by the data processing unit 18. The data preprocessing S210 enables faulty data sets to be identified and sorted out from the data measured by the first sensor 14.
- the data preprocessing S210 can use a low-pass filter with a cut-off frequency of preferably 0.2 Hz - 1.2 Hz.
- the data preprocessing S210 can identify outliers in the acquired data or data sets by means of a box plot and can sort out corresponding data or data sets.
- the data or data records retained in the data preprocessing S210 are then converted into a format suitable for further processing by means of a data conversion S220.
- the data converted in this way is buffered in step S230 "buffering" for transmission to the evaluation device 20.
- the sensor device 10 then transmits the data as first sensor information to the evaluation device 20.
- the transmission can be wireless or wired.
- the transmission can preferably be encrypted.
- the evaluation device 20 divides the first sensor information received from the sensor device 10 in one step data division S240 into a continuous stream of data segments of the same size.
- the size of the data segments can relate to a period of time of the first sensor information, which comprises each individual data segment, or to the physical size of each data segment.
- Each data segment is subjected to a spectral analysis by the evaluation device 20 in a step S250.
- the spectral analysis can be carried out, for example, using a discrete fast Fourier transformation.
- evaluation device 20 classifies the spectra obtained by spectral analysis S250.
- the classification can determine which respiratory activity event is present in the spectra obtained.
- the classification can take place in particular by means of machine-learning methods, such as, for example, neural networks or a support vector machine (SVM).
- SVM support vector machine
- the evaluation device can determine in step S270 whether a breathing condition of the subject is critical. If a critical breathing condition is present, the evaluation device 20 can trigger an alarm S290.
- Alarm S290 can be used to inform the test subject of the presence of a critical breathing condition or of the presence of a breathing activity event. The alarm can, for example, take place haptically, by means of appropriate actuators, and / or acoustically.
- the evaluation device 20 is designed to store the acquired data for later reproduction or evaluation. Furthermore, the evaluation device 20 can have an output medium which outputs an evaluation of the sleep behavior to the test subject. For example, a graphic and / or summary can be displayed by means of a display device, which shows the subject the evaluation of the sleep behavior. For example, the summary may include information about the frequency of the first breathing activity event, the frequency of the second breathing activity event, and the frequency of the third breathing activity event.
- the classification S260 is described in more detail below with reference to FIGS. 3 to 6.
- FIG. 3 shows an example of a time course of a concentration of volatile organic compounds (VOC) in ppb.
- Different respiratory activity events are shown as examples in a first time period Z1, in a second time period Z2 and in a third time period Z3.
- the first Time period Z1 shows the state of normal breathing activity of the test subject, which is referred to below as the third breathing activity event.
- the second time period Z2 shows a first breathing activity event that is different from the third breathing activity event.
- the first breathing activity event shown in the second time period Z2 corresponds to an apnea of the test person, that is to say a longer suspension of the test person's breathing.
- the third period Z3 shows a second breathing activity event, which differs from the first and third breathing activity events.
- the second respiratory activity event is a subject's hypopnea, which results in a decrease in the subject's respiratory flow.
- FIGS. 4 to 6 each show on the left side the time course of a concentration of volatile organic compounds measured in the ambient air of the first sensor 14.
- On the right an example of a spectrum of the respective time course obtained by the spectral analysis S250 is shown.
- the ordinate of the spectrum represents the amplitude, the period duration of the spectrum obtained being shown on the abscissa of the spectrum.
- Figure 4 also shows the third breathing activity event (normal breathing activity).
- the concentration of the volatile organic compounds fluctuates depending on the breathing activity of the test subject.
- exhaling the subject increases the concentration of volatile organic compounds.
- the concentration of volatile organic compounds begins to decrease again.
- the course over time of the concentration of volatile organic compounds is an essentially periodic sinusoidal course.
- the subject's respiratory rate can be determined in particular from the time course shown on the left. For this purpose, the distance between two neighboring peaks or local maxima P1 and P2 is considered.
- a peak P1 in the course of the concentration of the volatile organic compounds is a local maximum, which lies between two neighboring local ones Minima M1 and M2 lies.
- the respiratory rate of the subject can thus be determined from the time interval T1 between two adjacent peaks P1 and P2. Furthermore, the time course of the concentration of the volatile compounds fluctuates periodically around a first threshold value SW1 and is particularly dependent on the age and physique of the test subject.
- the first threshold value SW 1 lies between the minimum concentration of volatile organic compounds and the maximum concentration of volatile organic compounds when the subject breathes normally.
- the minimum concentration of the volatile organic compounds and the maximum concentration of the volatile organic compounds in a normal breathing of the test person can be determined by averaging the local minima or averaging the local maxima.
- the presence of the third respiratory event can be determined by the amplitude of the concentration of the volatile organic compounds being substantially constant.
- the spectrum obtained by the spectral analysis S250 on the right-hand side of FIG. 4 results in a characteristic course of the third breathing activity event, the presence of which can be determined by the classification S260.
- the spectrum of the third breathing activity event has a clear peak Pd, by means of which the presence of the third breathing activity event can be determined.
- the amplitude of the peak Pd is preferably at least 5 db / s higher than a first limit value GW1 with a period of 30 seconds.
- the peak Pd corresponds to a period of the subject's breathing activity, from which the subject's breathing frequency can be determined.
- the time course of the concentration of the volatile organic compounds in the presence of the first respiratory activity event is shown on the left-hand side of FIG.
- the right side of FIG. 5 shows the spectrum obtained by spectral analysis S250.
- the first respiratory event can be determined from the course of the concentration of the volatile organic compounds over time when the concentration of the volatile organic compounds starts or falls over a period T2 starting from a peak P3.
- the period T2 is at least 8 Seconds, preferably at least 10 seconds.
- the presence of the first respiratory event can additionally be determined if the concentration of the volatile organic compounds at the end of the period T2 is below a local minimum M3 which preceded, preferably immediately preceded, peak P3.
- the presence of the first respiratory activity event is preferably determined when the concentration of volatile organic compounds at the end of the period T2 is at least 10% below the local minimum M3.
- a spectrum characteristic of the first respiratory activity event can be generated by the spectral analysis S250.
- the S260 classification can be used to determine from this spectrum whether the first breathing activity event has occurred.
- the spectrum is characterized in particular by the fact that it has no peak characteristic of normal respiratory activity, see peak Pd in FIG. 4. Rather, the amplitude value approaches a second limit value GW2 from below with increasing period duration.
- the second limit value GW2 corresponds to an amplitude value with a period of approximately 30 seconds.
- the time course of the concentration of the volatile organic compounds in the presence of the second respiratory activity event is shown on the left side of FIG.
- the right side of FIG. 6 shows the spectrum obtained by spectral analysis S250.
- the second respiratory activity event can be determined from the time course of the concentration of the volatile organic compounds shown on the left-hand side of FIG.
- the concentration of volatile organic compounds fluctuates below a second threshold SW2.
- the respiratory rate can be determined via two adjacent peaks P4 and P5 and their temporal distance from one another.
- the second threshold value SW2 can be predetermined but can also be matched to the probands.
- the presence of the second respiratory activity event can be determined if the respiratory rate deviates from the respiratory rate during a normal respiratory activity of the subject.
- the presence of the second breathing activity event can be determined from the spectrum obtained by the spectral analysis S250 using the classification S260.
- the spectrum has a peak PH, which corresponds to the period of the test subject's breathing activity.
- the amplitude of the peak PH is below a third threshold value SW3.
- the third threshold value SW3 can be predetermined and / or matched to the test subject.
- the third threshold value SW3 is below the amplitude of the peak Pd during normal breathing by the subject.
- the frequency with which the first to third breathing activity events occur in each case can be used to determine the subject's sleeping behavior.
- the sensor device 10 and evaluation device 20 described above thus make it possible to determine the sleep behavior and in particular the first to third breathing activity events in real time.
- the sensor device 10 or the first sensor 14 is preferably designed to detect at least the following substances as volatile organic compounds: isoprene, ethanol, methanol, acetone and carbon monoxide.
- the sensor device 12 or the first sensor 14 is designed to detect only the following compounds as volatile organic compounds: isoprene, ethanol, methanol, acetone and carbon monoxide.
- the concentration of the volatile organic compounds is preferably detected as a total concentration of these compounds by the sensor device. This is advantageous since a separate detection and consideration of a concentration of each individual volatile organic compound can be omitted.
- the evaluation device 20 can take into account the movement data of the test person recorded by the second sensor 16 when determining the sleep behavior of the test person.
- FIG. 7 shows the sequence of recording the sleep behavior of a subject by the sensor device 10 and by the evaluation device 20, taking into account the movement data recorded by the second sensor 16.
- FIG. 7 illustrates in block sensor device 10 the functions performed by sensor device 10.
- the block evaluation device 20, on the other hand, illustrates the functions performed by the evaluation device 20.
- a measurement S300 is carried out with regard to the position and movement of the test subject.
- the movement data obtained in this way are subjected to a correction by the data processing unit 18 in step S310.
- the correction S310 can preferably use a low-pass filter and / or sort out exits in the movement data by means of a boxplot method.
- a data conversion S320 converts the data or data sets of the movement data retained by the correction S310 into a format which is suitable for further processing.
- the data converted in this way is buffered in step buffers S330 for transmission to the evaluation device 20.
- the sensor device 10 then transmits the data as second sensor information to the evaluation device 20. As described above, the transmission can be wireless or wired.
- the evaluation device 20 divides the second sensor information received from the sensor device 10 into data segments of equal size in step S340 (data sharing step S340).
- the evaluation device 20 then carries out a classification of the individual data segments in step S350.
- a movement or position of the test person can be determined by the classification S350 (step S360 posture determination).
- the classification can take place in particular by means of machine-learning methods, such as, for example, neural networks or a Support Vector Machine (SVM).
- SVM Support Vector Machine
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Abstract
Description
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018007876.1A DE102018007876A1 (de) | 2018-10-05 | 2018-10-05 | Sensorsystem, Auswertevorrichtung, Verfahren und Computerprogrammprodukt zur Erfassung des Schlafverhaltens eines Probanden |
| PCT/EP2019/076591 WO2020070126A1 (de) | 2018-10-05 | 2019-10-01 | Sensorsystem, auswertevorrichtung, verfahren und computerprogrammprodukt zur erfassung des schlafverhaltens eines probanden |
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| Publication Number | Publication Date |
|---|---|
| EP3860456A1 true EP3860456A1 (de) | 2021-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19783472.4A Withdrawn EP3860456A1 (de) | 2018-10-05 | 2019-10-01 | Sensorsystem, auswertevorrichtung, verfahren und computerprogrammprodukt zur erfassung des schlafverhaltens eines probanden |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3860456A1 (de) |
| DE (1) | DE102018007876A1 (de) |
| WO (1) | WO2020070126A1 (de) |
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| DE102021201498A1 (de) * | 2021-02-17 | 2022-08-18 | Zf Friedrichshafen Ag | Vorrichtung und Verfahren zur Bestimmung einer Aufmerksamkeit eines Fahrers eines Fahrzeugs |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013090999A1 (en) * | 2011-12-19 | 2013-06-27 | Resmed Limited | Respiratory treatment system including physiological sensors |
| US10780017B2 (en) * | 2013-03-15 | 2020-09-22 | Somne Llc | Treating sleep apnea with negative pressure |
| WO2016065180A1 (en) * | 2014-10-22 | 2016-04-28 | President And Fellows Of Harvard College | Detecting gases and respiration by the conductivity of water within a porous substrate sensor |
-
2018
- 2018-10-05 DE DE102018007876.1A patent/DE102018007876A1/de not_active Ceased
-
2019
- 2019-10-01 WO PCT/EP2019/076591 patent/WO2020070126A1/de not_active Ceased
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| DE102018007876A1 (de) | 2020-04-09 |
| WO2020070126A1 (de) | 2020-04-09 |
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