AT524069A1 - SYSTEM AND METHOD OF DETECTING SLEEP QUALITY - Google Patents

Abstract

The invention relates to a system (1000) for detecting the quality of sleep with a sleeping mattress (110), with at least one sensor system (200) arranged in the sleeping mattress (110) having at least one sensor being provided, and at least one evaluation unit having the at least one sensor system ( 200), and wherein the at least one sensor system (200) has at least one acceleration sensor arranged inside the sleeping mattress (110) and at least one rotation rate sensor for measuring the heart rate and/or the breathing rate and/or the movements of a person lying on the sleeping mattress (110). Person has, and a method for this.

Description

The invention relates to a system for detecting the quality of sleep with a sleeping mattress, wherein at least one sensor system arranged in the sleeping mattress is provided with at least one sensor, and at least one evaluation unit can be connected to the at least one sensor system, and a

Procedure for measuring sleep quality.

Sleep disorders are a very common impairment of the quality of life in otherwise healthy people, which affects around 75% of the 35-65 year old population in Germany, so that the most precise possible diagnosis of the responsible causes is of great importance. The best possible statement on possible causes is provided by polysomnography in the sleep laboratory, in which sensors and probes applied to the body are used to measure brain waves (EEG), heart activity (ECG), muscle activity (EMG), eye movements (EOG), respiratory flow, oxygen saturation, and body movements during sleep of sleep can be measured, recorded and evaluated using a computer in order to be able to analyze the entire sleep cycle and the individual sleep phases. Although this method provides the most accurate information, it is only suitable for medical clarifications due to the requirement of a fully equipped sleep laboratory, but not for permanent use in the private sector. In addition, due to the laboratory environment, the individual

sleep sensation and thus affects the analysis result.

For this reason, in recent years are increasingly new and simple

handheld devices for personal sleep monitoring have been developed.

From WO 2001/64103 A1, US 2018/049701 A1, CN 104 998 332 B,

CN 105 534 150 A, CN 205 411 149 U, CN 206 403 512 U, CN 207 544 738 U,

CN 107 713 513 A, CN 107 971 846 A, CN 107 582 064 A, CN 108 814 118 A or US Pat.

respiration, temperature and/or pressure, is placed in a bed mattress.

In US 2012/053424 A1, CN 125 01 59 U, KR 2013-0080920 A, FR 301 32 05 B1, CN 104 352 108 A, WO 2017/0202499 A1, CN 107 007 415 A, CN 107 485 229 A US 2019/201 269 A1, CN 109 308 503 A or the

CN 208 096 525 U discloses systems that use a large number of pressure sensors or inductive sensors in the mattress to record and

Measure.

US 2016/213 539 A1, KR 2017-0065853 A and CN 206 979 212 U show systems that are based on measuring the mattress climate, such as temperature and humidity.

Systems are disclosed in CN 106 175 263 A or CN 104 019 529 A which are based on the measurement of environmental parameters such as air pressure, room temperature, light and air conditions.

In CN 129 27 07 C or EP 2 617 328 A1 systems are disclosed which a pressure distribution in the mattress on the basis of measured physiological

Change parameters such as heart rate, body movement or breathing.

In US 2005/190 068 A1, CN 103 142 219 A, CN 203 169 157 U,

CN 106 236 015 A, KR 2019-0035361 A, CN 110 051 329 A or the

CN 110 101 375 A shows systems in which physiological parameters are recorded by means of flexible sensors or by means of flexible sensor arrays or sensor bands, for example by means of piezoelectric sensors in the mattress and, for example

using a smartphone app whose signals are processed.

Systems are known from CN 105 520 428 A and US 2017/290 548 A1 that monitor breathing by means of sound measurement or by means of capacitive sensors and

detect sleep apnea, for example.

In CN 205 306 506 U systems are disclosed in which using an infrared detector

sleep state is recorded.

In CN 106 333 691 A a wearable system is disclosed that by means

3D acceleration sensors measure movement data of the sleeping person.

A medical sleeping mattress with inflatable chambers is known from EP 2 664 315 A1, which uses a gyroscopic device for measuring the inclination of the head part of the sleeping mattress to control the pressure distribution in the inflatable chambers.

A disadvantage of the known systems for sleep monitoring is that the corresponding sensors are usually in direct physical contact, for example in the form of electrodes applied to the skin, or sensors to be worn directly on the body, for example in the form of sensors integrated into bracelets

Sensors or smart watches, which affects sleeping comfort.

In other systems, the sensor technology is arranged underneath the sleeping mattress between the sleeping mattress and the bed frame, so that the sensors only record a fraction of the parameters required for the most meaningful sleep monitoring possible. As a result of the damping, the measured values obtained are falsified, so that the results deviate greatly from reality and only insufficient measured values for the subsequent evaluation and sleep analysis

Are available.

Likewise, the systems described in the prior art usually only record individual parameters such as movement data or heart rate or respiration rate or body temperature using one or more linear or

matrix-like arranged measuring sensors.

It is therefore the object of the invention to provide a system and a method for detecting the quality of sleep, which allows precise measurement of parameters for monitoring the state of sleep and its biometric analysis.

This object is achieved according to the invention by a system of the type mentioned at the outset in that the at least one sensor system has at least one acceleration sensor arranged inside the sleeping mattress and at least one yaw rate sensor for measuring heart rate and/or respiration rate

and/or the movements of a person lying on the sleeping mattress.

The at least one sensor system is preferably located within the sleeping mattress in the area of the upper body of a person lying on the sleeping mattress

person arranged.

The sleep state of a person lying on the sleeping mattress is monitored by means of the sensor system integrated in the sleeping mattress in such a way that the sleeping person can detect significantly distinguishable vibration or

Movement patterns generated, which are transferred to the sleeping mattress and measured by the sensor system according to the invention. Thus, the beating heart creates an oscillation that is directly reflected as a vibration from the at least one

Acceleration sensor can be measured.

But also the blood flow in the body, which is phase-shifted to the heart rhythm in a forward/backward movement blood flow is conducted in spurts to the outer extremities and then back into the heart, whereby the mass of the blood pumped in such spurts corresponds to a multiple of the heart mass, creates another Vibration whose frequency is the same as, but out of phase with, that of the heartbeat. This second vibration aligned in the longitudinal axis of the body is known as cardioballistography, which generates a significantly stronger signal due to the larger blood mass in relation to the heart mass and therefore with higher precision using the combination of

Acceleration sensor and rotation rate sensor can be measured.

Another vibrational pattern is created by breathing, during which the thorax of the person lying on the sleeping mattress periodically expands and contracts again, the breathing being clearly distinguishable from heart rate and blood flow due to the much higher mass of the upper body

Vibration pattern generated.

Another vibration pattern is created by the body movements that are carried out by the person consciously or unconsciously during sleep, and which can lead to a change in lying position, a change in the center of gravity, movement of the extremities or similar. In particular, there is a change in the sinking profile in the sleeping mattress, which can be measured using the sensor combination of an acceleration sensor and a rotation rate sensor. In this way, the sleeping time can also be mapped in a delimitable way, because the covering of the sleeping mattress or its

Leaving through the sensors used is very precisely measurable.

In a particularly preferred embodiment of the invention, the sensor system includes an inertial measurement unit with a 6DoF sensor or 9DoF sensor. An inertial measurement unit (IMU) is a spatial combination of several inertial sensors such as accelerometers

and yaw rate sensors. Such devices usually come in

aircraft and rockets for flight navigation and in robotics for motion detection. In airplane models become special

space-saving IMU used.

In the sensor system according to the invention, an IMU with a 6DoF sensor (DoF=Degrees of Freedom) is preferably used, which performs acceleration measurements in the three spatial axes X,Y,Z and rotation rate measurements about the three spatial axes X, Y, Z axis and thus the vibrations caused by the person lying on the sleeping mattress are recorded particularly precisely. Disease-related deviations, such as sleep apnea as a result of respiratory arrest, hypoventilation or snoring, can also be recorded particularly well and used for subsequent evaluations

record.

In another particularly precise embodiment of the invention, the IMU has a 9DoF sensor, which, in addition to the six degrees of freedom described above, namely the linear acceleration measurement along the three spatial axes and the determination of the rotation rate about these three spatial axes, also determines the magnetic field strength of the earth's magnetic field along the three spatial axes possible. This additional measurement of the change in magnetic field strength as a result of a change in the orientation of the magnetic field sensor relative to the earth's magnetic field allows the sensor system according to the invention to determine the exact position within the sleeping mattress, which changes due to the movement of the body on the sleeping mattress.

Since environmental parameters can also have a significant influence on the quality of sleep, a further embodiment of the invention provides that the at least one sensor system has at least one additional sensor, which is preferably selected from a group that includes temperature sensors, humidity sensors, noise sensors, air quality sensors and/or or contains light sensors. Temperature sensors and moisture sensors also arranged in the sleeping mattress serve in particular to record further physiological parameters of the person lying on the sleeping mattress. These can be an integral part of the sensor system or stand alone

Sensor group can be arranged in the sleeping mattress.

Alternatively or additionally, in a further variant of the invention, sensors arranged outside the sleeping mattress, such as temperature sensors, humidity sensors, noise sensors, air quality sensors and/or light sensors, can be connected to the sensor system according to the invention, which in particular allows conclusions to be drawn about the influence of room climate, lighting conditions and/or Allow background noise on sleep quality.

In a further embodiment of the invention, the sleeping mattress is designed as a test mattress in which the at least one sensor system is arranged. Using this test mattress, which preferably has the different sensors described above, a selection for an individual to the

sleeping mattress adapted to the needs of the person being tested.

Furthermore, the object is achieved by a method for detecting the quality of sleep, wherein at least one sensor system is provided which has at least one acceleration sensor and a yaw rate sensor, with which the heart rate and/or breathing rate and/or movements of a person lying on the sleeping mattress are measured. and in a second step, in at least one evaluation unit, the course of sleep based on the received

Measured values are assessed qualitatively and quantitatively.

In the method according to the invention for monitoring the sleep state of a person lying on the sleeping mattress using a sensor system integrated into the sleeping mattress, the measurement signals obtained are evaluated in the evaluation unit, usually an integrated processor unit or an external one

computer system.

Provision is preferably made here for the at least one sensor system to record the measured values at predefined time intervals, preferably at time intervals between 1 minute and 15 minutes, particularly preferably at time intervals between 2 minutes and 5 minutes, and to transmit them to the at least one evaluation unit and store them. Thus, during the observation/monitoring period, the successively measured values, in particular the measured frequencies and amplitudes of the various vibrations caused by heartbeat, blood flow, respiration and/or movement, are analyzed at defined time intervals

changing parameters such as heart rate, breathing rate and movement patterns

preferably a sleep phase model is created. The sleep is summarized from the measured values determined and the sleep phase model by means of one or more easily interpretable characteristic values. In particular, sleep fragmentation and anomalies such as respiratory arrest, snoring and possibly also cardiac arrhythmias can be made visible and chronologically assignable.

Provision is particularly preferably made here for the measured values processed mathematically in the at least one evaluation unit to be output as a hypnogram. This is particularly easy to read for the layperson.

In order to reduce the influence of interference signals from the environment, such as vibrations in the building, natural vibrations of the sleeping furniture or influences from a second person and thus to improve the quality of the recorded measured values, a further embodiment of the invention provides that mathematical filters, such as Kalmann filter, when evaluating

of the measurement results are used.

A significant advantage of the method according to the invention is in particular that the sleep quality is monitored over a longer period of time without the person concerned, for example by attaching sensors

her body etc. has to intervene.

In a further embodiment of the invention, recommendations for improving the quality of sleep are output, preferably automatically, on the basis of the results determined. These recommendations relate to measures such as time recommendations with regard to the beginning of bed rest, the duration of sleep or the time of waking up, or the change in environmental conditions, in particular the room climate or the lighting conditions in the immediate vicinity of the sleeping furniture.

The measures can also affect the sleeping furniture itself. In a further preferred embodiment of the invention, to improve the quality of sleep, recommendations for adjusting the sleeping mattress are issued on the basis of the results determined and/or the adjustments to the sleeping mattress are automated, in particular their hardness and/or the hardness zone distribution in the

be made concerning sleeping mattress.

Evaluation unit stored database.

The recommendations determined in this way can relate to a large number of individual measures, such as time recommendations for starting bed rest, the duration of sleep or the time of waking up, or information of a general nature such as general recommendations for healthy and restful sleep. Warnings can also be issued for detected anomalies such as respiratory arrest or snoring or muscle twitching.

Finally, the system according to the invention or the method according to the invention can also be used in particular when selecting a sleeping mattress that is optimally adapted to the individual needs of the person. For this purpose, the sensor system according to the invention is accommodated within a sleeping mattress functioning as a test mattress, the hardness or hardness distribution of the test mattress being adaptable as required in a manner known per se, for example by means of compressed air or replaceable foam inserts. By evaluating the measurement signals obtained depending on the configuration of the test mattress, the selection of an optimal

sleeping mattress allowed.

In the following, using a non-restrictive exemplary embodiment

associated figures explains the invention in more detail. show in it

Fig. 1 is a schematic representation of the system according to the invention for

sleep quality monitoring,

2 shows an exemplary signal recording of the system according to the invention, and

3 shows a hypnogram determined from the signal recording.

In Fig. 1, an inventive system for monitoring the sleep quality 1000 is shown schematically, wherein a sleeping furniture 100 is provided on which

a sleeping mattress 110 is arranged. In this sleeping mattress 110 is a

Sensor system 200 arranged in that area of the sleeping mattress 110 below its lying surface, on which usually the upper body of one on the

Sleeping mattress 110 people rests.

In this embodiment of the invention, the sensor system 200 is equipped with a 6DoF sensor 210; alternatively, 9DoF sensors are also used. A 6DoF sensor allows acceleration measurements along the three spatial axes X, Y, Z and a yaw rate measurement «x, Ay, Xz around each of these three spatial axes, i.e. measurements along six degrees of freedom. In addition, the sensor system 200 is equipped with further sensors for recording measured values, in particular the temperature, the humidity and/or the light conditions (not shown).

A person resting on the sleeping mattress 110 generates typical vibration patterns that are detected by the 6DoF sensor 210 of the sensor system 200 . The heartbeat of the person generates a pulsating blood movement in the body, with the 6DoF sensor 210 of the sensor system 200 recording the heartbeat on the one hand and this pulsating blood flow on the other hand along the body axis of the person on the sleeping mattress 110 as an independent oscillation with the associated frequency and acceleration amplitude. Due to the rhythmic expansion and contraction of the chest, breathing also generates a second oscillation pattern that can be distinguished from the heart rhythm and is also detected using the 6DoF sensor 210 . Finally, every change in the sleeping position, position or posture of the person on the sleeping mattress 110 produces a change in the sleeping mattress 110, another different vibration pattern, which in turn is detected by the 6DoF sensor 210 sensor system 200 by measuring acceleration or yaw rate. Alternatively or additionally, it can also be provided that a change in the lying position of the person on the sleeping mattress causes a change in the position and orientation of the sensor system 200 within the sleeping mattress 210 and thus relative to the earth's magnetic field, which is registered via an additional sensor for measuring the magnetic field strength .

The measured values determined by the sensor system 200 are usually recorded and/or in a data processing system (not shown).

evaluated and presented.

Thus, FIG. 2 shows a typical signal recording 300 of the sensor system 200 according to the invention in the form of a diagram, on the y-axis of which a large number of parameters are shown as a function of time (x-axis). For example, the temperature, the earth's magnetic field, the linear acceleration in the three spatial axes, the rotational speed, etc. can be read. The oscillation curves 301 recorded in the area labeled "Linear Acceleration" show the heartbeat with its effect on the 6DoF sensor 210 in the three spatial directions X, Y, Z, while in the field labeled "Gravity Factor" the associated oscillation curves 302 for the respiratory rate are shown. From the recorded oscillation curves 302

for the respiratory rate, the respiratory interval 302A can be determined.

In order to clearly display the signal recording 300 for the user, it is preferably provided that a so-called hypnogram 400 (FIG. 3) is created, in which a sleep phase profile 410 is displayed on the basis of the signals received by conversion using mathematical algorithms. The duration of the individual sleep phases, for example the waking phase 411, the dream phase (REM phase) 412, the light sleep phase 413 and the deep sleep phase 414, can be taken from this hypnogram 400. In addition, the individual sleep phases are evaluated as curves 415 for displaying the individual sleep cycles. Finally, any body movement or body activity 416 over the duration of sleep can also be seen in this hypnogram 400

be removed.

It is also conceivable that additional curves for environmental parameters, such as temperature conditions, noise exposure, etc. or other physiological parameters such as body temperature, can be included in this hypnogram 400

be included.

The signal recording 300 or the hypnogram 400 allows the sleep quality of the person on the sleeping mattress 210 to be assessed and can be used as evidence of any pathological changes, such as sleep apnea,

cardiac arrhythmias, etc. are used.

Claims (12)

System (1000) for detecting the quality of sleep with a sleeping mattress (110), wherein at least one sensor system (200) arranged in the sleeping mattress (110) is provided with at least one sensor, and at least one evaluation unit can be connected to the at least one sensor system (200). , characterized in that the at least one sensor system (200) at least one within the sleeping mattress (110) arranged acceleration sensor and at least one yaw rate sensor for measuring the heart rate and / or the respiratory rate and / or the Has movements of a person lying on the sleeping mattress (110). System according to Claim 1, characterized in that the at least one sensor system (200) is arranged inside the sleeping mattress (110) in the region of the upper body of a person lying on the sleeping mattress (110). is. System according to Claim 1 or 2, characterized in that the sensor system (200) comprises an inertial measurement unit with a 6DoF sensor (210) or a 9DoF sensor. System according to one of Claims 1 to 3, characterized in that the at least one sensor system (200) has at least one additional sensor which is preferably selected from a group comprising temperature sensors, humidity sensors, noise sensors, Contains air quality sensors and/or light sensors. System according to one of Claims 1 to 4, characterized in that the sleeping mattress (110) is designed as a test mattress in which the at least one sensor system (200) is arranged. Method for detecting the sleep quality with a system (200) according to one of Claims 1 to 5, consisting of a sleeping mattress (110), wherein at least one sensor system (200) arranged in the sleeping mattress (110) is provided with at least one sensor, and at least an evaluation unit can be connected to the at least one sensor system (200), characterized in that the at least one sensor system (200) 11. 12. 12 has at least one acceleration sensor and at least one yaw rate sensor, with which the heart rate and/or the breathing rate and/or the movements of a person lying on the sleeping mattress (110) are measured, and in a second step in the at least one evaluation unit the sleep pattern based on the received Measured values are assessed qualitatively and quantitatively. The method according to claim 6, characterized in that the at least one sensor system (200) detects the measured values in predefined time intervals, preferably in time intervals between 1 min and 15 min, particularly preferably in time intervals between 2 min and 5 min and to the at least one evaluation unit transmitted. Method according to one of claims 6 or 7, characterized in that the measured values processed mathematically in the at least one evaluation unit as a hypnogram (400) and/or as a sleep quality representative value can be output. The method according to any one of claims 6 to 8, characterized in that based on the results determined, recommendations for improving the Sleep quality, preferably be issued automatically. Method according to Claim 9, characterized in that the recommendations relate to measures, such as time recommendations with regard to the start of bed rest, the duration of sleep or the time of waking up, or the change in environmental conditions, in particular the room climate or the lighting conditions. Method according to one of Claims 6 to 8, characterized in that, in order to improve the quality of sleep, recommendations for adjusting the sleeping mattress (110), in particular relating to the hardness and/or the hardness zone distribution in the sleeping mattress (110), are issued and/or or preferably done automatically will. The method according to any one of claims 6 to 11, characterized in that the sleeping mattress acts as a test mattress, the at least in the Test mattress arranged at least one sensor system (200) based on the results determined recommendations for the selection of an individual adapted sleeping mattress, preferably automatically. 2020 07 30 HA