Sleep monitoring device based on piezoelectric sensor

Abstract

According to the sleep monitoring device based on the piezoelectric sensor, mattress type non-load sleep monitoring is achieved through the piezoelectric sensor array, pressure changes caused by central pulse rhythm, breathing and body movement in the sleep process are measured in a non-contact mode in the natural sleep state, the sleep habit is not changed, and no constraint exists; the method is an ideal low-load sleep monitoring method and has a more general application scene. The scheme not only realizes no load of the user, but also can extract data such as heart rate, respiration rate and body movement after digital signal processing, realizes detection of parameters such as center rate, respiration and body movement in the no-load sleep process and sleep quality evaluation, can be used for sleep quality evaluation of common people, can also be applied to other fields, and has wide application prospects. The method comprises the steps of exercise heart rate monitoring, medical pulse monitoring, sleep quality monitoring in daily training of astronauts and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to sleep monitoring technical field, especially sleep monitoring device based on piezoelectric sensor. BACKGROUND

[0002] Sleep monitoring is indispensable in modern medical diagnosis, and currently clinical sleep evaluation generally adopts all-night polysomnography PSG (including electroencephalogram, electrooculogram, electromyogram, electrocardiogram, etc.), sleep staging is carried out according to R&K or AASM sleep staging criteria, arrhythmia, respiratory events and awakening times are counted, and sleep quality is evaluated by analyzing the above various data.

[0003] The polysomnography obtains rich signal types, but various electrodes and numerous sensors need to be pasted on the patient, which causes great physiological and psychological load to the patient. In a sense, the polysomnography monitoring itself disturbs the sleep quality and affects the objectivity of the monitoring result. The high-intrusion and high-physiological-load characteristics of the polysomnography monitoring are increasingly in conflict with the demand of people-oriented non-load sleep monitoring, and the development of low-physiological-load or non-load sleep monitoring technology has become an inevitable trend of sleep medicine development.

[0004] In addition to the polysomnography monitoring method, other sleep monitoring methods currently include polysomnography monitoring method, blood oxygen saturation monitoring method and body activity change recording method. The polysomnography device is high in price and complex in operation, a large number of electrodes need to be pasted on the head of the subject, which seriously disturbs sleep. The blood oxygen saturation monitoring method is generally mainly used for sleep apnea monitoring, and has little value for ordinary sleep analysis. The body activity change recording method uses an inflatable micro-motion sensitive mattress with a relatively large volume, and the reaction is not sensitive enough.

[0005] Therefore, it is necessary to provide a new way to solve the above technical problems. UTILITY MODEL CONTENT

[0006] In order to realize the above-mentioned purposes and other advantages of the utility model, the utility model aims at providing a sleep monitoring device based on piezoelectric sensor, which comprises a main control circuit, a plurality of piezoelectric sensor arrays, a plurality of piezoelectric sensor interface circuits, a main control voltage stabilizing circuit and a sensor voltage stabilizing circuit.

[0007] The main control circuit is electrically connected with the piezoelectric sensor array through the piezoelectric sensor interface circuit, the main control voltage stabilizing circuit is electrically connected with the main control circuit, and the sensor voltage stabilizing circuit is electrically connected with the piezoelectric sensor interface circuit.

[0008] The main control voltage stabilizing circuit is used for providing working power supply for the main control circuit.

[0009] The sensor stabilizing circuit is used to power the piezoelectric sensor array;

[0010] The piezoelectric sensor array is used to collect vital sign data of a user during sleep;

[0011] The main control circuit is used to process the data collected by the piezoelectric sensor array to realize sleep monitoring.

[0012] Further, the main control circuit comprises a main controller, a crystal oscillator circuit, and a reset circuit; the crystal oscillator circuit and the reset circuit are electrically connected with the main controller.

[0013] Further, the crystal oscillator circuit comprises a patch crystal oscillator, a first capacitor, and a second capacitor; pin 1 of the patch crystal oscillator is grounded through the first capacitor; pin 2 of the patch crystal oscillator is grounded through the second capacitor; pin 1 and pin 2 of the patch crystal oscillator are respectively electrically connected with the input pin and the output pin of the low-speed external clock of the main controller.

[0014] Further, the reset circuit comprises a first resistor and a third capacitor; the first resistor is connected with the output end of the main control stabilizing circuit; the first resistor and the third capacitor are connected in series to ground; the non-synchronous reset pin of the main controller is connected between the first resistor and the third capacitor.

[0015] Further, the main control circuit further comprises a storage circuit; the storage circuit comprises a Flash storage chip, a second resistor, a third resistor, a fourth capacitor, and a fifth capacitor; the chip selection pin, the write protection pin, and the power supply pin of the Flash storage chip are connected with the output end of the main control stabilizing circuit through the second resistor and the third resistor; the output end of the main control stabilizing circuit is grounded through the fourth capacitor; the ground pin of the Flash storage chip is grounded; the hold pin of the Flash storage chip is grounded through the fifth capacitor; the data output pin, the chip selection pin, the serial clock pin, and the data input pin of the Flash storage chip are connected with the corresponding pins of the main controller.

[0016] Further, the piezoelectric sensor array comprises a plurality of piezoelectric ceramic sensors and a plurality of piezoelectric film sensors.

[0017] Further, the piezoelectric sensor interface circuit comprises a connector and a plurality of resistors; the piezoelectric ceramic sensors and the piezoelectric film sensors are respectively connected with the corresponding pins of the main controller through the pins on the connector and grounded through the resistors; the power supply pin of the connector is connected with the output end of the sensor stabilizing circuit; and the ground pin of the connector is grounded.

[0018] Further, the main control voltage stabilizing circuit adopts a low-dropout three-terminal voltage regulator, and the sensor voltage stabilizing circuit adopts a CMOS linear voltage regulator.

[0019] Further, a capacitor filter circuit is further included, the capacitor filter circuit is formed by four capacitors in parallel, and the capacitor filter circuit is connected between an output end of the low-dropout three-terminal voltage regulator and the ground.

[0020] Compared with the prior art, the embodiment of the utility model has the beneficial effects that:

[0021] The utility model provides a sleep monitoring device based on piezoelectric sensor, through piezoelectric sensor array has realized mattress formula no -load sleep monitoring, in natural sleep state adopts non -contact mode measurement sleep process central pulse rhythm, breathing and body movement caused pressure variation, does not change the sleep habit, does not have any constraint, it is an ideal low -load sleep monitoring method, has more universal application scene.The scheme not only realizes user no -load, after digital signal processing can extract heart rate, respiratory rate and body movement data, realizes no -load sleep process heart rate, breathing and body movement parameter detection, carries out sleep quality evaluation, can be used for ordinary crowd sleep quality evaluation, also can be applied in other fields, such as sports heart rate monitoring, medical pulse monitoring, astronaut daily training in sleep quality monitoring etc.

[0022] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following detailed description of the preferred embodiments of the utility model and the accompanying drawings as follows.The specific embodiment of the utility model is given in detail by the following examples and its accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings described herein are used to provide further understanding of the utility model, constitute a part of this application, the schematic embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute undue limitation on the utility model.In the drawings:

[0024] Figure 1 It is piezoelectric sensor based sleep monitoring device schematic diagram;

[0025] Figure 2 It is main controller schematic diagram;

[0026] Figure 3 It is crystal oscillator circuit diagram;

[0027] Figure 4 It is reset circuit diagram;

[0028] Figure 5 It is storage circuit diagram;

[0029] Figure 6 Interface circuit diagram for piezoelectric sensor

[0030] Figure 7 Main control voltage stabilizing circuit diagram

[0031] Figure 8 Sensor voltage stabilizing circuit diagram

[0032] Figure 9 Capacitance filtering circuit diagram

[0033] Figure 10 BCG schematic diagram

[0034] Figure 11 JJ interval schematic diagram of BCG

[0035] Figure 12 Heart rate scatter diagram

[0036] Figure 13 Heart rate judgment result schematic diagram

[0037] Figure 14 Typical BCG schematic diagram

[0038] Figure 15 Body movement BCG schematic diagram

[0039] Figure 16 Mixed obstructive apnea schematic diagram

[0040] Figure 17 Sleep monitoring method flow chart DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] In the drawings, the shapes and sizes can be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to refer to the same or like parts.

[0043] In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, and the like are defined with respect to the configuration shown in the drawings and are meant to be relative concepts, thus it is possible to change accordingly according to different positions, different use states, and the like, so these or other orientations should not be used to explain as restrictive terms.

[0044] Terms related to attachment, coupling, and the like (for example, “connected” and “attached”) refer to a relationship in which structures are fixed or attached to each other directly or indirectly through intermediate structures, as well as movable or rigid attachment or relationship, unless explicitly stated otherwise.

[0045] Embodiment 1

[0046] A sleep monitoring device 100 based on a piezoelectric sensor, as shown in Figure 1 includes a master control circuit 110, a plurality of piezoelectric sensor arrays 120, a plurality of piezoelectric sensor interface circuits 130, a master voltage stabilizing circuit 140, and a sensor voltage stabilizing circuit 150.

[0047] The master control circuit is electrically connected to the piezoelectric sensor array through the piezoelectric sensor interface circuit, the master voltage stabilizing circuit is electrically connected to the master control circuit, and the sensor voltage stabilizing circuit is electrically connected to the piezoelectric sensor interface circuit.

[0048] The master voltage stabilizing circuit is used to provide working power supply for the master control circuit.

[0049] The sensor voltage stabilizing circuit is used to supply power for the piezoelectric sensor array.

[0050] The piezoelectric sensor array is used to collect vital sign data of a user during sleep.

[0051] The master control circuit is used to process the data collected by the piezoelectric sensor array to realize sleep monitoring.

[0052] When the heart beats to pump blood into large blood vessels, it will cause weak body movements. This repetitive weak movement can be captured by a high-sensitivity pressure sensor, so as to record the corresponding periodic motion pattern, which is called ballistocardiogram (BCG), as shown in Figures 10-16 .

[0053] The aforementioned sleep monitoring device 100 based on piezoelectric sensors is installed inside a mattress. Subtle body movements caused by heartbeats are detected by a high-sensitivity piezoelectric sensor array placed within the mattress, triggering its piezoelectric effect. This converts the vibration signal into a pseudo-voltage signal, which is then digitized by a hardware system and transmitted to a host computer for subsequent signal processing, analysis, and calculation, thereby deriving a series of human cardiac function data indicators.

[0054] In some embodiments, the main control circuit includes a main controller, a crystal oscillator circuit, and a reset circuit; the crystal oscillator circuit and the reset circuit are electrically connected to the main controller. Figure 2 As shown, the main controller uses an STM32 microcontroller.

[0055] The crystal oscillator circuit is used to achieve stable oscillation. For example... Figure 3 As shown, the crystal oscillator circuit includes a surface-mount crystal Y1, a first capacitor C11, and a second capacitor C12. Pin 1 of the surface-mount crystal is grounded through the first capacitor, and pin 2 of the surface-mount crystal is grounded through the second capacitor. Pins 1 and 2 of the surface-mount crystal are electrically connected to the input pin OS32_IN and the output pin OS32_OUT of the low-speed external clock of the main controller, respectively.

[0056] The reset circuit is used to restore the circuit to its initial state. For example... Figure 4 As shown, the reset circuit includes a first resistor R8 and a third capacitor C10. The first resistor is connected to the output terminal of the main control voltage regulator circuit, i.e., connected to a 3V3 power supply. The first resistor and the third capacitor are connected in series to ground. The asynchronous reset pin NRST of the main controller is connected between the first resistor and the third capacitor.

[0057] In some embodiments, the main control circuit further includes a storage circuit for storing data from the main controller, including but not limited to data transmitted back to the main controller from the piezoelectric sensor array. Figure 5 As shown, the storage circuit includes a Flash memory chip U1, a second resistor R28, a third resistor R29, a fourth capacitor C18, and a fifth capacitor C2. The chip select pin CS of the Flash memory chip is connected to the output terminal of the main control voltage regulator circuit via the second resistor, the hold pin HOLD via the third resistor, the write protection pin WP, and the power supply pin VCC, i.e., connected to a 3V3 power supply. The output terminal of the main control voltage regulator circuit (i.e., the 3V3 power supply) is grounded via the fourth capacitor. The ground pin GND of the Flash memory chip is grounded. The hold pin of the Flash memory chip is grounded via the fifth capacitor. The data output pin SO, chip select pin CS, serial clock pin CLK, and data input pin SI of the Flash memory chip are connected to the corresponding pins of the main controller.

[0058] The piezoelectric sensor array includes several piezoelectric ceramic sensors and several piezoelectric thin-film sensors. Preferably, the piezoelectric sensor array includes two piezoelectric ceramic sensors and one piezoelectric thin-film sensor. That is, each piezoelectric sensor interface circuit is electrically connected to two piezoelectric ceramic sensors and one piezoelectric thin-film sensor to collect vital sign data of the user during sleep.

[0059] This embodiment uses five piezoelectric sensor interface circuits as an example. Each piezoelectric sensor interface circuit is as follows: Figure 6 As shown. Further, the piezoelectric sensor interface circuit includes a connector X1 and multiple resistors. Preferably, X1 is a 6P horizontal pin connector with a 1.25mm pitch. The piezoelectric ceramic sensor and the piezoelectric thin film sensor are each connected to the corresponding pin of the main controller via pins on the connector and grounded via resistors. For example, one piezoelectric ceramic sensor in a piezoelectric sensor array is electrically connected to pin 5 of X1 and X_OUT1 of the main controller; another piezoelectric ceramic sensor is electrically connected to pin 1 of X1 and Y_OUT1 of the main controller; the piezoelectric thin film sensor is electrically connected to pin 2 of X1 and YL1 of the main controller; the power supply pin of the connector (pin 3 of X1) is connected to the output terminal of the sensor voltage regulator circuit, i.e., connected to a 3V power supply; and the ground pin of the connector (pin 4 of X1) is grounded.

[0060] like Figure 7 As shown, the main control voltage regulator circuit uses a low dropout three-terminal regulator U4. The IN pin of U4 is connected to a 5V power supply and grounded through parallel C16 and C15. The ADI pin is grounded, and the two OUT pins are grounded through parallel C14 and C17. The OUT pin of U4 outputs a voltage of 3.3V, which provides the working power for the main control circuit.

[0061] like Figure 8 As shown, the sensor voltage regulator circuit uses a CMOS linear regulator U3. The IN pin of U3 is connected to a 5V power supply and grounded through C9. The GND pin is grounded, the EN pin is grounded through resistor R4, and the OUT pin is grounded through C18. The OUT pin of U3 outputs a voltage of 3V to power the piezoelectric sensor array, and the BP pin is grounded through C7.

[0062] In some embodiments, such as Figure 9 As shown, it also includes a capacitor filter circuit, which is formed by four capacitors C5, C4, C3 and C6 connected in parallel. The capacitor filter circuit is connected between the output terminal of the low dropout three-terminal regulator and ground.

[0063] The sleep monitoring method of the above-mentioned sleep monitoring device based on piezoelectric sensors, such as Figure 17 As shown, the method includes the following steps:

[0064] S1, acquiring vital sign data; that is, the vital sign data collected by the plurality of piezoelectric sensor arrays 120, generating a ballistocardiogram (BCG), a typical ballistocardiogram is as shown in Figure 14 , a body movement ballistocardiogram is as shown in Figure 15 , a mixed obstructive apnea is as shown in Figure 16 .

[0065] S2, calculating a cardiac cycle interval through the vital sign data; as shown in Figure 11 , for the BCG, calculating the JJ interval.

[0066] S3, calculating heart rate variability through the cardiac cycle interval, and making a heart rate scatter plot;

[0067] The heart rate variability is calculated by recording the JJ interval sequence, so as to obtain the HRV.

[0068] As shown in Figure 12 , the JJ interval data in the BCG is collected to make a heart rate scatter plot, so that the sinus heart rate, supraventricular and ventricular arrhythmia can be judged macroscopically.

[0069] S4, obtaining health feedback information according to the heart rate variability;

[0070] The HRV can be used for stress rehabilitation. By analyzing the difference between each heart beat, the health feedback information can be obtained in time. The larger the value of the HRV is, the better the rehabilitation and rest are, and the healthier the person is.

[0071] S5, judging the sinus heart rate, supraventricular and ventricular arrhythmia according to the heart rate scatter plot.

[0072] As shown in Figure 13 , from the heart rate scatter plot, the normal sinus heart rate, sinus combined with supraventricular premature beat, and persistent atrial fibrillation can be judged.

[0073] The embodiment provides a sleep monitoring device based on a piezoelectric sensor. The piezoelectric sensor array is used for bed mat type non-load sleep monitoring. In a natural sleep state, the piezoelectric sensor array is used for measuring pressure changes caused by cardiac pulse movement, respiration and body movement in a sleep process in a non-contact mode. The sleep habit is not changed, and there is no any constraint. The piezoelectric sensor array is an ideal low-load sleep monitoring method, and has a more universal application scene. The piezoelectric sensor array not only realizes non-load of a user, but also extracts heart rate, respiration rate and body movement data after digital signal processing. The piezoelectric sensor array realizes non-load sleep process heart rate, respiration and body movement parameter detection, and performs sleep quality evaluation. The piezoelectric sensor array can be used for sleep quality evaluation of ordinary people, and can be applied to other fields, such as sports heart rate monitoring, medical pulse monitoring, sleep quality monitoring in daily training of astronauts, and the like.

[0074] The number of devices and the processing size described herein are used to simplify the description of the present application. The application, modification and change of the present application are obvious to those skilled in the art.

[0075] Although the embodiments of the present application have been disclosed as above, it is not limited to the application and the embodiments listed in the specification, and it can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

[0076] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0077] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly explains the difference from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant part can be referred to the part of the method embodiment.

[0078] The above is only an embodiment of the present application, and is not used to limit one or more embodiments of the present application. One or more embodiments of the present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of one or more embodiments of the present application should be included in the scope of claims of one or more embodiments of the present application.

Claims

1. A sleep monitoring device based on a piezoelectric sensor, characterized in that: It includes a main control circuit, multiple piezoelectric sensor arrays, multiple piezoelectric sensor interface circuits, a main control voltage regulator circuit, and sensor voltage regulator circuits; The main control circuit is electrically connected to the piezoelectric sensor array through the piezoelectric sensor interface circuit, the main control voltage regulator circuit is electrically connected to the main control circuit, and the sensor voltage regulator circuit is electrically connected to the piezoelectric sensor interface circuit; The main control voltage regulator circuit is used to provide operating power to the main control circuit; The sensor voltage regulator circuit is used to power the piezoelectric sensor array; The piezoelectric sensor array is used to collect vital sign data of the user during sleep. The main control circuit is used to process the data collected by the piezoelectric sensor array to achieve sleep monitoring.

2. The sleep monitoring device based on a piezoelectric sensor as described in claim 1, characterized in that: The main control circuit includes a main controller, a crystal oscillator circuit, and a reset circuit; the crystal oscillator circuit and the reset circuit are electrically connected to the main controller.

3. The sleep monitoring device based on a piezoelectric sensor as described in claim 2, characterized in that: The crystal oscillator circuit includes a surface-mount crystal oscillator, a first capacitor, and a second capacitor. Pin 1 of the surface-mount crystal oscillator is grounded through the first capacitor, and pin 2 of the surface-mount crystal oscillator is grounded through the second capacitor. Pins 1 and 2 of the surface-mount crystal oscillator are electrically connected to the input pin and output pin of the low-speed external clock of the main controller, respectively.

4. A sleep monitoring device based on a piezoelectric sensor as described in claim 3, characterized in that: The reset circuit includes a first resistor and a third capacitor. The first resistor is connected to the output terminal of the main control voltage regulator circuit. The first resistor and the third capacitor are connected in series to ground. The asynchronous reset pin of the main controller is connected between the first resistor and the third capacitor.

5. A sleep monitoring device based on a piezoelectric sensor as described in claim 4, characterized in that: The main control circuit also includes a storage circuit, which includes a Flash memory chip, a second resistor, a third resistor, a fourth capacitor, and a fifth capacitor. The chip select pin of the Flash memory chip is connected to the output terminal of the main control voltage regulator circuit via the second resistor, the hold pin via the third resistor, the write protection pin, and the power supply pin. The output terminal of the main control voltage regulator circuit is grounded via the fourth capacitor. The ground pin of the Flash memory chip is grounded. The hold pin of the Flash memory chip is grounded via the fifth capacitor. The data output pin, chip select pin, serial clock pin, and data input pin of the Flash memory chip are connected to the corresponding pins of the main controller.

6. A sleep monitoring device based on a piezoelectric sensor as described in claim 2, characterized in that: The piezoelectric sensor array includes several piezoelectric ceramic sensors and several piezoelectric thin film sensors.

7. A sleep monitoring device based on a piezoelectric sensor as described in claim 6, characterized in that: The piezoelectric sensor interface circuit includes a connector and multiple resistors. The piezoelectric ceramic sensor and the piezoelectric thin film sensor are each connected to the corresponding pins of the main controller via pins on the connector and grounded via resistors. The power supply pin of the connector is connected to the output terminal of the sensor voltage regulator circuit, and the ground pin of the connector is grounded.

8. A sleep monitoring device based on a piezoelectric sensor as described in claim 1, characterized in that: The main control voltage regulator circuit uses a low dropout three-terminal regulator, and the sensor voltage regulator circuit uses a CMOS linear regulator.

9. A sleep monitoring device based on a piezoelectric sensor as described in claim 8, characterized in that: It also includes a capacitor filter circuit, which is formed by four capacitors connected in parallel and connected between the output terminal of the low dropout three-terminal regulator and ground.

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