Sleep-aiding intelligent pillow for regulating electroencephalogram rhythm through combination of ultrasound and infrasound and regulation method

Abstract

The invention relates to the technical field of sleep monitoring and sleep intervention, and provides a sleep-aiding intelligent pillow for regulating and controlling electroencephalogram rhythm through combination of ultrasound and infrasound and a regulation and control method. The sleep-aiding intelligent pillow comprises a pillow body, a piezoelectric sleep monitoring sensor, a central processing module, an ultrasonic regulation and control module and a power supply unit are arranged in the pillow body, and the piezoelectric sleep monitoring sensor is used for acquiring pressure change information; the central processing module is used for extracting physiological parameters and body movement parameters according to the pressure change information, judging the sleep stage of the user and controlling the ultrasonic regulation and control module to emit ultrasonic pulses with low-intensity infrasound oscillation to directionally stimulate a specific region of the brain of the user so as to improve the sleep quality; the power supply unit is used for supplying power to the piezoelectric sleep monitoring sensor, the central processing module and the ultrasonic regulation and control module.

Description

Technical Field

[0001] The present invention relates to the technical field of sleep monitoring and sleep intervention, and in particular to a smart sleep-aiding pillow that combines ultrasound and infrasound to regulate brain electrical rhythm, and a regulation method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Studies have found that the sleep center is between the thalamus and the medulla oblongata. Regulating the functions of the cerebral cortex and deep multinuclear areas can achieve the effect of helping sleep. Therefore, the development of convenient and efficient physical technology for regulating brain function for sleep disorders can greatly improve the sleep quality of people with sleep disorders, thereby reducing their risk of neurological diseases such as anxiety and depression due to long-term sleep difficulties, and even regulating their brain function state and enhancing brain memory function.

[0004] Acoustic wave stimulation is currently a commonly used method to improve sleep. Acoustic wave stimulation is divided into ultrasound and infrasound. Ultrasound regulates brain function by activating or inhibiting neural activity in the cerebral cortex or nuclei, and has shown breakthrough potential in the regulation of sleep disorders. Infrasound promotes sleep by inducing slow EEG waves through rhythmic resonance. This technology is highly safe, has no obvious side effects, and can be bidirectionally and targeted modulated. However, low-intensity ultrasound has a small focusing range and mostly acts on the cerebral cortex, while infrasound generating equipment is large and difficult to miniaturize.

[0005] An existing sound wave stimulation approach involves mixing selected sleep-inducing music (audible sound waves) with the different brainwaves of each sleep stage, creating a composite brainwave pattern that effectively interacts with these brainwaves. This frequency-modulated brainwave signal is then transmitted to an audio player, gradually inducing brainwaves and helping insomniacs enter a deep sleep phase. This technology, however, uses only single ultrasonic, infrasonic, or audible sound waves, rather than combining them. This approach fails to leverage the combined advantages of ultrasonic and infrasonic stimulation. Furthermore, the sound stimulation, which is transmitted directly to the auditory organs through the audio player for a prolonged period, relies on environmental shielding or psychological suggestion, making it unsuitable for individuals with sensitive hearing. The inner ear continuously converts acoustic signals into neural signals that are transmitted to the brain. This process not only causes progressive damage to the auditory system but also triggers a series of physiological reactions.

[0006] In addition, another existing sound wave stimulation scheme is to use infrasound to induce brain waves, so that people can enter theta wave state, the moderate deep sleep delta wave state, the deep sleep delta wave state, and finally induce the alpha wave state to wake people up, so as to achieve rapid deep sleep and relieve fatigue. During the relief process, only a single infrasound signal is used and the human body is completely exposed to the infrasound stimulation space, which cannot accurately and efficiently stimulate specific brain areas, thereby achieving a method of relieving fatigue. Moreover, the user is in a cylindrical cabin structure. Due to the cabin structure, standing waves will form, resulting in energy deposition and irreversible cell or organ damage. Moreover, the device requires a fully enclosed environment to ensure the effect of the infrasound and isolate external noise. It is bulky and requires a large enough independent space to accommodate the device. It has high requirements for the location, which may be difficult to meet in some ordinary places such as bedrooms and offices. Summary of the Invention

[0007] To address the technical problems encountered in the aforementioned background technology, the present invention provides a sleep-aiding smart pillow and control method that utilizes ultrasound and infrasound to regulate EEG rhythms. A piezoelectric sleep monitoring sensor is positioned in the center of the pillow surface, extracting respiratory, heart rate, and body movement parameters through pressure change information. A central processing module determines the user's sleep stage based on the parameters extracted by the piezoelectric sleep monitoring sensor and controls the ultrasonic control module to emit flexible, low-intensity infrasound oscillations (0.01-100 Hz) to stimulate specific areas of the user's brain, thereby regulating EEG rhythms and improving sleep quality. This creates a closed-loop "perception-analysis-control" system. Furthermore, the central processing module stores user sleep data and ultrasonic control module operation information and wirelessly transmits this data to a mobile phone app, allowing the user to intuitively view the data. A power supply unit provides power to the entire smart pillow system. This invention integrates non-invasive sleep monitoring and intervention, allowing users to complete comprehensive sleep management by simply using the pillow as normal. This system combines the advantages of personalization, portability, and comfort with the advantages of miniaturization and safety.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: The first aspect of the present invention provides a smart sleep-aiding pillow that combines ultrasound and infrasound to regulate brain electrical rhythm.

[0009] A smart sleep-aiding pillow that can regulate brain electrical rhythms by combining ultrasound and infrasound includes a pillow body, wherein a piezoelectric sleep monitoring sensor, a central processing module, an ultrasound control module, and a power supply unit are arranged in the pillow body. The piezoelectric sleep monitoring sensor is used to obtain pressure change information; The central processing module is used to extract physiological parameters and body movement parameters based on the pressure change information, determine the user's sleep stage, and control the ultrasonic control module to emit low-intensity infrasonic oscillation ultrasonic pulses to stimulate specific areas of the user's brain in a targeted manner to improve sleep quality; The power supply unit is used to power the piezoelectric sleep monitoring sensor, the central processing module and the ultrasonic control module.

[0010] Furthermore, the ultrasonic control module outputs an ultrasonic pulse wave of infrasound oscillation with a set fundamental frequency, a set envelope shape, a set oscillation frequency and a set pulse width according to the control signal transmitted by the central processing module.

[0011] Furthermore, the envelope shape of the ultrasonic pulse wave of the infrasonic oscillation includes a sine wave, a square wave, a triangle wave, a trapezoidal wave, and a sawtooth wave.

[0012] Furthermore, the method judges the user's sleep stage and controls the ultrasonic control module to emit ultrasonic pulses of low-intensity infrasonic oscillations; including: in the awake stage, using square combined sound waves with an oscillation frequency of 8-20Hz, peak-to-peak value of 10V, and a pulse duration of 1ms to reduce EEG rhythm and promote sleep; in the light sleep stage, using triangle combined sound waves with an oscillation frequency of 0.1-8Hz, peak-to-peak value of 16V, and a pulse duration of 2ms to promote deep sleep; in the deep sleep stage, using sinusoidal combined sound waves with an oscillation frequency of 0.1Hz, peak-to-peak value of 10V, and a pulse duration of 2ms to consolidate the deep sleep state.

[0013] Furthermore, the ultrasonic control module includes an ultrasonic transmitting circuit, an ultrasonic transducer, a heat sink and a spring. The ultrasonic transmitting circuit is connected to the ultrasonic transducer, and a heat sink is provided on the ultrasonic transmitting circuit. The lower end surface of the ultrasonic transducer is connected to the bottom of the pillow through a spring.

[0014] Furthermore, the ultrasonic transducer is placed in the lower middle part of the pillow body, with an inclination angle of 15°-30°, and the sound wave focusing direction is directed to a specific area of ​​the user's brain.

[0015] Furthermore, the pillow body includes an outer layer of medical silica gel and an inner core of memory foam.

[0016] Furthermore, the memory foam inner core has built-in through-type air holes and is provided with a hollow channel for laying sensor signal lines and ultrasonic module wires, and the channel is filled with flexible epoxy resin fixing glue.

[0017] Furthermore, the central processing module includes a data storage module for storing the user's sleep data and the operation mode of the ultrasound control module.

[0018] Furthermore, the central processing module also includes a wireless communication module for transmitting data to a mobile phone APP for display on the mobile phone APP.

[0019] Furthermore, the physiological parameters include heart rate and respiratory rate.

[0020] The second aspect of the present invention provides a method for controlling a sleep-aiding smart pillow that combines ultrasound and infrasound to regulate EEG rhythm.

[0021] A method for controlling a sleep-aiding smart pillow that combines ultrasound and infrasound to regulate EEG rhythm, characterized in that the method is applied to the sleep-aiding smart pillow that combines ultrasound and infrasound to regulate EEG rhythm as described in the first aspect, comprising: The pressure sleep monitoring sensor monitors pressure change information and uploads it to the central processing module; The central processing module extracts the user's physiological signals and body movement data based on the pressure change information, and analyzes the user's sleep state based on the user's physiological signals and body movement data. Determine whether the user has left the bed. If so, send a command to the ultrasonic control module to turn off, and the ultrasonic control module executes the command; otherwise, Determine whether the user is in the awake stage. If so, send an instruction to the ultrasonic control module: the output effect is a square joint sound wave with an oscillation frequency of 8-20Hz, a peak-to-peak value of 10V, and a pulse duration of 1ms. The oscillation frequency is gradually reduced from 20Hz to 8Hz, and the deceleration rate is dynamically adjusted according to the historical time data of the user from the awake period to the light sleep period. The ultrasonic control module executes the instruction; otherwise, Determine whether the user is in the light sleep stage. If so, send an instruction to the ultrasonic control module: output a triangular combined sound wave with an oscillation frequency of 0.1-8Hz, a peak-to-peak value of 16V, and a pulse duration of 2ms. The oscillation frequency is gradually reduced from 8Hz to 0.1Hz. The deceleration rate is dynamically adjusted based on the historical time data of the user entering the deep sleep stage from the light sleep stage. The ultrasonic control module executes the instruction; otherwise, Determine whether the user is in a deep sleep stage. If so, send an instruction to the ultrasonic control module: output a 3-minute sinusoidal combined sound wave with an oscillation frequency of 0.1Hz, a peak-to-peak value of 10V, and a pulse duration of 2ms. The ultrasonic control module executes the instruction.

[0022] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a smart sleep-aiding pillow that uses ultrasound and infrasound to regulate brain electrical rhythms. The pillow comprises a pillow body, a piezoelectric sleep monitoring sensor, a central processing module, an ultrasonic control module, and a power supply unit. The pillow body comprises an outer layer of medical silicone and an inner core of memory foam. The piezoelectric sleep monitoring sensor is arranged in the center of the pillow surface and extracts breathing, heart rate, and body movement parameters through pressure change information. The central processing module determines the user's sleep stage based on the parameters extracted by the piezoelectric sleep monitoring sensor and controls the ultrasonic control module to emit flexible ultrasonic pulses with 0.01-100Hz infrasound oscillations to stimulate specific areas of the user's brain in a targeted manner to improve sleep quality. The power supply unit supplies power to the entire smart pillow system. The present invention realizes the integration of non-invasive sleep monitoring and intervention, combining personalization, portability, and comfort.

[0023] The ultrasonic pulse of 0.01-100Hz infrasonic oscillation emitted by the present invention has a waveform that is the ultrasonic envelope of the infrasonic oscillation, and the envelope shape includes but is not limited to square, triangle, trapezoid, sinusoidal, etc., so as to achieve the purpose of combined stimulation of ultrasound and infrasound. Ultrasound and infrasound synergistically regulate sleep disorders. High-frequency ultrasound accurately activates or inhibits the neural activity of the cerebral cortex / nuclei, combined with low-frequency infrasound whole-brain resonance to enhance slow wave rhythms, integrating the dual advantages of the two in aiding sleep, and providing a precise and non-invasive solution for the treatment of sleep disorders. In addition, the present invention breaks through the limitations of traditional technology of monitoring and intervention separation and parameter solidification, and for the first time integrates multimodal signal perception and ultrasonic infrasound joint regulation into daily pillows, providing an efficient, comfortable and non-invasive solution for groups such as anxious insomnia and sleep cycle disorders, with significant clinical and market application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 This is a framework diagram of a smart sleep-aiding pillow that combines ultrasound and infrasound to regulate EEG rhythms, provided in one embodiment of the present invention; Figure 2 This is a schematic diagram of a circuit module of a smart sleep-aiding pillow that combines ultrasound and infrasound to regulate EEG rhythm, provided in one embodiment of the present invention; Figure 3 This is a structural diagram of a smart sleep-aiding pillow that combines ultrasound and infrasound to regulate EEG rhythms, provided in one embodiment of the present invention; Figure 4 is a circuit structure diagram of a central processing module provided in one embodiment of the present invention; Figure 5 This is a hardware block diagram of an ultrasonic control module for a smart pillow provided in one embodiment of the present invention; Figure 6Schematic diagram of ultrasound and infrasound combined with sound waves provided in one embodiment of the present invention; Figure 7 This is a flow chart of a method for controlling a sleep-aiding smart pillow that combines ultrasound and infrasound to regulate EEG rhythms, provided in one embodiment of the present invention; Explanation of the accompanying symbols: 1. Pillow body, 2. Piezoelectric sleep monitoring sensor, 3. Central processing module, 4. Ultrasonic control module, 5. Power supply module, 6. Pulse trigger interval, 7. Pulse duration (pulse width), 8. Ultrasonic fundamental frequency, 9. Ultrasonic envelope of infrasonic oscillation, 101. Outer layer of medical silicone, 102. Memory foam inner core, 201. Strip PVDF flexible piezoelectric film sensor, 301. ESP32 microcontroller, 401. Ultrasonic transmitting circuit, 402. Ultrasonic transducer, 403. Heat sink, 404. Spring, 501. Rechargeable battery. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Figure 1 This is a schematic diagram of the overall framework of a smart sleep-aiding pillow that combines ultrasound and infrasound to regulate EEG rhythms, provided in one embodiment of the present invention; Figure 1 The sleep-aiding smart pillow described in this embodiment includes a pillow body 1, which is equipped with a piezoelectric sleep monitoring sensor 2, a central processing module 3, an ultrasonic control module 4, and a power supply unit 5. The central processing module 3 is connected to the piezoelectric sleep monitoring sensor 2, the ultrasonic control module 4, and the power supply unit 5, and the power supply unit 5 supplies power to the piezoelectric sleep monitoring sensor 2, the central processing module 3, and the ultrasonic control module 4. The piezoelectric sleep monitoring sensor 2, the central processing module 3, the ultrasonic control module 4, and the power supply unit 5 are integrated into one body and distributed throughout the sleep-aiding smart pillow.

[0030] Wherein, the piezoelectric sleep monitoring sensor 2 is used to obtain pressure change information; The central processing module 3 is used to extract physiological parameters and body movement parameters based on pressure change information, determine the user's sleep stage, and control the ultrasonic control module 4 to emit ultrasonic pulses of low-intensity infrasonic oscillations to stimulate specific areas of the user's brain in a targeted manner to improve sleep quality.

[0031] In this embodiment, the piezoelectric sleep monitoring sensor 2 can obtain the user's physiological parameters (heart rate, respiratory rate) and body movement parameters after analyzing and processing the monitored piezoelectric signals, and transmit the collected raw piezoelectric data and parameters to the central processing unit module 3 through serial communication.

[0032] The ultrasonic control module 4 is used to change the electrical excitation signal of the ultrasonic transducer so that it directly generates an ultrasonic pulse signal with an oscillation in the infrasonic frequency range. The electrical excitation signal is flexibly implemented through the ultrasonic control module, thereby changing the fundamental frequency, pulse width, pulse oscillation frequency and pulse shape and other parameters of the ultrasonic infrasonic combined sound wave signal generated by the transducer. It supports ultrasonic emission of low-intensity infrasonic oscillations of 0.01-100Hz, covering the full frequency band of delta wave, alpha wave and beta wave attenuation modes, and can adapt to different needs through a variety of oscillation waveforms such as sine wave, square wave, sawtooth wave and trapezoidal wave. During the entire sleep process, according to the needs of the brain in different sleep stages, the fundamental frequency, oscillation frequency, pulse shape, pulse width and other parameters are flexibly switched to achieve precise control of EEG rhythm. During the wakefulness stage, square combined sound waves with an oscillation frequency of 8-20Hz, peak-to-peak value of 10V, and a pulse duration of 1ms are emitted to reduce EEG rhythm and promote sleep. During the light sleep stage, triangular combined sound waves with an oscillation frequency of 0.1-8Hz, peak-to-peak value of 16V, and a pulse duration of 2ms are emitted to promote deep sleep and achieve precise intervention.

[0033] During use, the piezoelectric sleep monitoring sensor 2 monitors physiological signals (respiratory rate and heart rate) and body movement data, which are then uploaded to the central processing module 3. This module is configured to receive and process the data, using an algorithm to determine the user's sleep state. This determination is converted into instructions and sent to the ultrasonic control module 4 for parameter control, achieving a sleep-aiding effect. This process enables sleep monitoring and sleep assistance throughout the entire user's sleep cycle, from wakefulness to deep sleep.

[0034] The types and frequencies of brain waves produced by the brain in different sleep stages are different. Ultrasonic signals with different waveform oscillations have their own advantages and disadvantages in inducing brain wave resonance. It is difficult for a single waveform to accurately match and adjust the brain wave rhythm of each stage; and the action time of the ultrasonic signal within an infrasonic oscillation cycle, that is, the pulse width of the ultrasonic signal, also affects the sleep-aiding effect in different sleep stages. In the falling asleep stage, the present invention adopts a square combined sound wave with low intensity and short pulse duration, which has the best resonance effect, so that the user can quickly enter a sleep state; in the light sleep stage, the present invention adopts a sinusoidal combined sound wave with high intensity and long pulse duration, so that the user can stably enter a deep sleep state. By adjusting the oscillation frequency, oscillation waveform and pulse width of the ultrasonic signal, the present invention can accurately control the brain wave characteristics of each sleep stage, effectively guide the brain into an ideal sleep state, and improve the sleep-aiding effect.

[0035] The proposed sleep-aiding smart pillow, which combines ultrasound and infrasound to regulate EEG rhythms, primarily regulates whole-brain rhythms, supplemented by focused regulation of sleep-related brain regions. Based on the distinct sleep-regulating mechanisms and complementary ranges of action of ultrasound and infrasound, this EEG rhythm regulation technology, supplemented by sleep state monitoring and feedback, can achieve real-time, personalized EEG regulation, alleviate sleep disorders, and improve sleep quality. Specifically, the combined ultrasound and infrasound EEG regulation technology can achieve the goal of promoting sleep by rapidly reducing EEG rhythms.

[0036] Figure 2 Schematic diagram of the circuit module of the smart sleep-aiding pillow for regulating EEG rhythm by combining ultrasound and infrasound provided in one embodiment of the present invention; Figure 2 The piezoelectric sleep monitoring sensor is connected to the central processing module through the serial port. The central processing module includes: a serial port data receiving module, a sleep state judgment module, a data storage module, a wireless communication module and a control signal output module. The serial port data receiving module is used to receive the pressure change information uploaded by the piezoelectric sleep monitoring sensor and extract the breathing, heart rate and body movement parameters; the sleep state judgment module is used to judge the sleep state according to the breathing, heart rate and body movement parameters, where the sleep state includes: awake, light sleep and deep sleep; the data storage module is used to store the user's sleep data and the operating mode of the ultrasonic control module (on or off and current output parameters, etc.), so that the user can view historical sleep records and device usage at any time; the wireless communication module is used to transmit data to the mobile phone APP, so that the user can intuitively understand the sleep quality, device status and other information on the mobile phone; the control signal output module is used to generate an electrical excitation signal that controls the ultrasonic control module to output the corresponding specific frequency and waveform.

[0037] In some embodiments, after extracting physiological and motion parameters and determining the user's sleep stage, the central processing module organizes and packages this data according to a specific timestamp, user identifier, and other information, and stores it in a data storage module. The stored data includes, but is not limited to, sleep duration, the ratio of deep sleep to light sleep, heart rate variation curves, respiratory rate variation curves, and the operating mode of the ultrasonic control module. The central processing module transmits the organized data to the mobile phone app via a wireless communication module (such as Bluetooth or Wi-Fi) according to a preset transmission protocol. The transmission can be set to scheduled transmission (such as once an hour), real-time transmission, or transmission upon user active request. To ensure the stability and security of data transmission, data encryption transmission technology can be used.

[0038] In this embodiment, the ultrasonic control module includes a waveform editing digital circuit and a digital-to-analog conversion circuit implemented by a field-programmable gate array (FPGA), which can emit infrasound oscillation ultrasonic pulse waves with flexible and adjustable ultrasonic fundamental frequency (20-1000 kHz), oscillation frequency (0.01-100 Hz), pulse shape (sine wave, square wave, triangle wave, trapezoidal wave, sawtooth wave, etc.), pulse width, etc., to induce resonance of the brain wave rhythm of the corresponding frequency, gradually inducing the user to enter a sleep state.

[0039] The field-programmable gate array (FPGA) core uses a direct digital synthesizer (DDS) module as a signal source to generate high-precision digital baseband signals. Simultaneously, a programmable pulse generator generates an enable control signal whose time-domain parameters (pulse width and frequency) can be dynamically configured, thereby achieving pulse output.

[0040] Figure 3 This is a structural diagram of a smart sleep-aiding pillow that combines ultrasound and infrasound to regulate EEG rhythms, provided in one embodiment of the present invention; Figure 3The sleep-aiding smart pillow includes a pillow body, which includes an outer layer of medical silicone 101 and a memory foam core 102. A strip-shaped PVDF flexible piezoelectric film sensor 201 is provided in the outer layer of medical silicone 101. The strip-shaped PVDF flexible piezoelectric film sensor 201 is connected to an ESP32 microcontroller 301 via a wire. The ESP32 microcontroller 301 is connected to a rechargeable battery 501 and an ultrasonic transmitting circuit 401 via a wire. A heat sink 403 is provided on the ultrasonic transmitting circuit 401. The ultrasonic transmitting circuit 401 is connected to an ultrasonic transducer 402 via a wire, and a spring 404 is provided between the ultrasonic transducer 402 and the bottom of the memory foam core 102. Among them, the strip-shaped PVDF flexible piezoelectric film sensor 201, the esp32 microcontroller 301, the ultrasonic transmitting circuit 401, the heat sink 403, the ultrasonic transducer 402, the spring 404 and the rechargeable battery 501 are all arranged in the memory foam core 102; and the rechargeable battery 501 provides power for the strip-shaped PVDF flexible piezoelectric film sensor 201, the esp32 microcontroller 301, the ultrasonic transmitting circuit 401 and the ultrasonic transducer 402.

[0041] In some embodiments, the outer layer of medical silicone 101 has passed ISO 10993 biocompatibility certification and is non-irritating to human skin when in long-term contact. In addition, the acoustic impedance of silicone (≈1.5 MRayl) is very close to that of human soft tissue (≈1.6 MRayl), which significantly reduces the reflection loss of ultrasound at the interface between materials. The silicone molecular chain is highly flexible and has a high absorption rate for sound waves. Low , with high efficiency in sound wave energy transmission. The memory foam core's 102-density density slowly deforms according to the user's head and neck contours, conforming to the physiological curvature of the cervical spine. This increases the pressure dispersion area by over 60% compared to ordinary foam, reducing localized pressure and effectively preventing muscle stiffness or stiff neck problems associated with traditional hard pillows. The memory foam core is built with through-holes (opening rate ≥30%) with a diameter of 1-3 mm and a pore size of 5-10 μm, creating a bidirectional air convection channel that accelerates the dissipation of heat generated by the pillow's internal circuitry. A hollow channel is also provided for routing sensor signal lines and ultrasonic module conductors, and is filled with flexible epoxy resin adhesive.

[0042] In one embodiment, the outer layer of medical silicone 101 may be 5 mm thick, has passed ISO 10993 biocompatibility certification, and is non-irritating to human skin in long-term contact.

[0043] In one embodiment, the strip-shaped PVDF flexible piezoelectric film sensor 201 is flexible, distributed in the center of the sleep-aiding smart pillow, conforms to the ergonomic structure, and is used to collect chest vibration signals.

[0044] In some embodiments, the ultrasonic transmitting circuit 401 , the ultrasonic transducer 402 , the heat sink 403 and the spring 404 constitute an ultrasonic control module, and the ultrasonic transmitting circuit 401 includes a waveform editing digital circuit and a 10-bit DAC conversion module.

[0045] The ultrasonic transducer 402 outputs a signal sound pressure level that is always below the biosafety boundary of 80 dB (focusing depth is approximately 10 cm). The ultrasonic transducer 402 is fixed by a coil spring 404 , and the spring structure is elastic, thereby ensuring the comfort of the sleep-aiding smart pillow.

[0046] In some embodiments, the ultrasonic transducer 402 is a large-diameter piezoelectric ceramic transducer with a backing having good wave absorption properties. It is placed in the lower middle part of the pillow with an inclination angle of 15°-30°. The sound wave focusing direction is directed to a specific area of ​​the user's brain, realizing a neural regulation approach that mainly regulates whole-brain rhythms and supplements with focused regulation of sleep-related brain areas.

[0047] In some embodiments, the ESP32 microcontroller reads monitoring data transmitted from the serial port, collects heart rate, respiratory rate, and body movement data in real time, constructs a 30-second sliding window, and uses exponential smoothing to dynamically update the individualized physiological baseline (heart rate baseline value = historical average × 95% + current value × 5%). Combined with multi-dimensional features such as heart rate variability (HRV), respiratory variation coefficient, and body movement index, the microcontroller determines the user's current sleep state in the priority order of "high-frequency body movement → deep sleep (heart rate / respiration lower than 20% of baseline) → rapid eye movement (prominent respiratory variability) → light sleep (high HRV + low body movement)" and outputs a control signal for the ultrasonic control module, which is connected to the ultrasonic control module via a DuPont cable, thereby controlling the output effect of the ultrasonic control module.

[0048] The ultrasonic control module can emit flexible infrasonic oscillation ultrasonic pulse waves. The ultrasonic control module outputs infrasonic oscillation ultrasonic pulse waves with set fundamental frequency, set envelope shape, set oscillation frequency and set pulse width according to the control signal transmitted by the central processing module.

[0049] In some embodiments, the ESP32 microcontroller 301 uses an algorithm to analyze the user's current sleep state and the parameters received via the serial port. This information is then transmitted to the user's mobile phone app via wireless communication (e.g., Bluetooth / Wi-Fi), allowing the user to access sleep data and adjust their sleep habits. Simultaneously, the microcontroller 301 outputs control signals to control the operation of the ultrasonic transmitter circuit 401.

[0050] In some embodiments, a plurality of rechargeable batteries 501 constitute a power supply unit.

[0051] Figure 4is a circuit diagram of a central processing module provided in one embodiment of the present invention; Figure 4 , the central processing module can use the ESP32-WROOM-32-N4 chip.

[0052] Figure 5 This is a hardware block diagram of the ultrasonic control module of the smart pillow provided in one embodiment of the present invention; Figure 5 The FPGA receives external inputs for the clock signal (CLK), reset signal (RST), and two control signals (CTRL1 and CTRL2). These control signals are used to transmit control instructions to the FPGA to achieve different ultrasonic and infrasound combined sound wave output effects. The DA_CLK clock signal from the FPGA synchronizes the DAC's data sampling and conversion operations. DA_DATA [9:0] is a 10-bit data bus from the FPGA that provides the DAC with digital data to be converted to analog signals. DA_OUT is the analog signal output by the DAC, which is the result of converting the input digital data into analog quantities and is used to drive the ultrasonic transducer.

[0053] Figure 6 is a schematic diagram of an ultrasonic and infrasound combined sound wave provided in one embodiment of the present invention; Figure 6 The central processing module controls the ultrasonic control module to generate an ultrasonic fundamental frequency 8 by setting the pulse trigger interval 6, the pulse duration (pulse width) 7, and the pulse shape. The envelope of the ultrasonic fundamental frequency 8 is an ultrasonic envelope 9 of infrasonic oscillation, thereby fusing the ultrasonic wave and the infrasound wave to obtain a pulse of ultrasonic wave and infrasound wave to help the user sleep.

[0054] Figure 7 This is a flow chart of a method for controlling a sleep-aiding smart pillow that combines ultrasound and infrasound to regulate brain electrical rhythms, provided in one embodiment of the present invention; Figure 7 The control method is applied to the above-mentioned embodiment of the intelligent sleep-aiding pillow that combines ultrasound and infrasound to control brain electrical rhythm, and includes: S1: The piezoelectric sleep monitoring sensor monitors the user's physiological signals (respiratory rate and heart rate) and body movement data and uploads them to the central processing module; S2: The central processing module receives data and analyzes the user's sleep status according to the algorithm to determine whether the user has left the bed. If so, it sends a "shut down" command to the ultrasonic control module, which executes the command. Otherwise, it proceeds to the next step.

[0055] S3: The central processing module analyzes the user's sleep state based on the received data using an algorithm to determine whether they are awake. If so, it issues a command to the ultrasonic control module: "Output effect = square combined sound wave with an oscillation frequency of 8-20Hz, a peak-to-peak value of 10V, and a pulse duration of 1ms." The oscillation frequency is gradually reduced from 20Hz to 8Hz. The rate of reduction is dynamically adjusted based on the user's historical data of transitions from awake to light sleep. The ultrasonic control module executes the command. Otherwise, the process proceeds to the next step.

[0056] S4: The central processing module analyzes the received data based on an algorithm to determine whether the user is in light sleep. If so, it issues a command to the ultrasonic control module: "Output effect = triangular combined sound wave with an oscillation frequency of 0.1-8Hz, a peak-to-peak voltage of 16V, and a pulse duration of 2ms." The oscillation frequency is gradually reduced from 8Hz to 0.1Hz. This reduction rate is dynamically adjusted based on the user's historical data of transitions from light sleep to deep sleep. The ultrasonic control module executes the command. Otherwise, the process proceeds to the next step.

[0057] S5: The central processing module analyzes the user's sleep state based on the algorithm based on the data received, and determines whether the user is in deep sleep. If so, it sends an instruction to the ultrasonic control module: "output effect = 3 minutes of sinusoidal combined sound waves with an oscillation frequency of 0.1Hz, a peak-to-peak value of 10V, and a pulse duration of 2ms". The ultrasonic control module executes the instruction.

[0058] Specific sleep stage judgment is shown in Table 1: Table 1 Sleep stage judgment

[0059] This sleep-aid pillow based on sleep monitoring is based on the user's physiological parameters and body movement parameters, and interconnects the sensor, central processing unit and ultrasonic control module to achieve the effect of sleep data monitoring and real-time ultrasonic infrasound combined control to improve the user's sleep quality.

[0060] At the same time, the central processing module stores the relevant data and sends it to the mobile phone APP via wireless communication for users to view.

[0061] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A smart sleep-aiding pillow that combines ultrasound and infrasound to regulate brain electrical rhythm, comprising a pillow body, characterized in that: The pillow body is equipped with a piezoelectric sleep monitoring sensor, a central processing module, an ultrasonic control module and a power supply unit. The piezoelectric sleep monitoring sensor is used to obtain pressure change information; The central processing module is used to extract physiological parameters and body movement parameters based on the pressure change information, determine the user's sleep stage, and control the ultrasonic control module to emit low-intensity infrasonic oscillation ultrasonic pulses to stimulate specific areas of the user's brain in a targeted manner to improve sleep quality; The power supply unit is used to power the piezoelectric sleep monitoring sensor, the central processing module and the ultrasonic control module.

2. The intelligent sleep-aiding pillow for regulating EEG rhythm by combining ultrasound and infrasound according to claim 1, characterized in that: The ultrasonic control module outputs an ultrasonic pulse wave of infrasound oscillation with a set frequency, a set envelope shape, a set oscillation frequency and a set pulse width according to the control signal transmitted by the central processing module.

3. The intelligent sleep-aiding pillow for regulating EEG rhythm by combining ultrasound and infrasound according to claim 2, characterized in that: The envelope shapes of the ultrasonic pulse waves of infrasonic oscillations include sine waves, square waves, triangle waves, trapezoidal waves, and sawtooth waves.

4. The intelligent sleep-aiding pillow for regulating EEG rhythm by combining ultrasound and infrasound according to claim 1, characterized in that: The method determines the user's sleep stage and controls the ultrasonic control module to emit ultrasonic pulses of low-intensity infrasonic oscillations; including: in the awake stage, using square combined sound waves with an oscillation frequency of 8-20Hz, a peak-to-peak value of 10V, and a pulse duration of 1ms to reduce EEG rhythm and promote sleep; in the light sleep stage, using triangle combined sound waves with an oscillation frequency of 0.1-8Hz, a peak-to-peak value of 16V, and a pulse duration of 2ms to promote deep sleep; in the deep sleep stage, using sinusoidal combined sound waves with an oscillation frequency of 0.1Hz, a peak-to-peak value of 10V, and a pulse duration of 2ms to consolidate the deep sleep state.

5. The intelligent sleep-aiding pillow for regulating EEG rhythm by combining ultrasound and infrasound according to claim 1, characterized in that: The ultrasonic control module includes an ultrasonic transmitting circuit, an ultrasonic transducer, a heat sink and a spring. The ultrasonic transmitting circuit is connected to the ultrasonic transducer, and a heat sink is provided on the ultrasonic transmitting circuit. The lower end surface of the ultrasonic transducer is connected to the bottom of the pillow through a spring.

6. The intelligent sleep-aiding pillow for regulating EEG rhythm by combining ultrasound and infrasound according to claim 5, characterized in that: The ultrasonic transducer is placed in the lower middle part of the pillow, with an inclination angle of 15°-30°, and the sound wave focusing direction is directed to a specific area of ​​the user's brain.

7. The intelligent sleep-aiding pillow for regulating EEG rhythm by combining ultrasound and infrasound according to claim 1, characterized in that: The pillow body includes an outer layer of medical silica gel and a memory foam inner core. The memory foam inner core has built-in through-type air holes and a hollow channel for laying sensor signal lines and ultrasonic module wires. The channel is filled with flexible epoxy resin fixing glue.

8. The intelligent sleep-aiding pillow for regulating EEG rhythm by combining ultrasound and infrasound according to claim 1, characterized in that: The central processing module includes a data storage module for storing the user's sleep data and the operation mode of the ultrasound control module.

9. The intelligent sleep-aiding pillow for regulating EEG rhythm by combining ultrasound and infrasound according to claim 1, characterized in that: The central processing module also includes a wireless communication module for transmitting data to a mobile phone APP for display on the mobile phone APP.

10. A method for controlling a sleep-aiding smart pillow that combines ultrasound and infrasound to regulate brain electrical rhythm, characterized in that: The sleep-aiding smart pillow for combined ultrasound and infrasound regulation of EEG rhythm as claimed in any one of claims 1 to 9 comprises: The pressure sleep monitoring sensor monitors pressure change information and uploads it to the central processing module; The central processing module extracts the user's physiological signals and body movement data based on the pressure change information, and analyzes the user's sleep state based on the user's physiological signals and body movement data. Determine whether the user has left the bed. If so, send a command to the ultrasonic control module to turn off, and the ultrasonic control module executes the command; otherwise, Determine whether the user is in the awake stage. If so, send an instruction to the ultrasonic control module: the output effect is a square joint sound wave with an oscillation frequency of 8-20Hz, a peak-to-peak value of 10V, and a pulse duration of 1ms. The oscillation frequency is gradually reduced from 20Hz to 8Hz, and the deceleration rate is dynamically adjusted according to the historical time data of the user from the awake period to the light sleep period. The ultrasonic control module executes the instruction; otherwise, Determine whether the user is in the light sleep stage. If so, send an instruction to the ultrasonic control module: output a triangular combined sound wave with an oscillation frequency of 0.1-8Hz, a peak-to-peak value of 16V, and a pulse duration of 2ms. The oscillation frequency is gradually reduced from 8Hz to 0.1Hz. The deceleration rate is dynamically adjusted based on the historical time data of the user entering the deep sleep stage from the light sleep stage. The ultrasonic control module executes the instruction; otherwise, Determine whether the user is in a deep sleep stage. If so, send an instruction to the ultrasonic control module: output a 3-minute sinusoidal combined sound wave with an oscillation frequency of 0.1Hz, a peak-to-peak value of 10V, and a pulse duration of 2ms. The ultrasonic control module executes the instruction.

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