Stress management and relaxation device based on multimodal stimulations inspired by purring

Abstract

The present invention relates to a relaxation device comprising a generator for generating vibratory frequencies corresponding to the purring of a cat, characterized in that said generator is integrated into a housing (100) having a means (200) for positioning same on the solar plexus of a user.

Description

Stress management and relaxation device based on multimodal stimulation inspired by purring. Scope of the invention

[0001] The present invention relates to the field of technologies applied to well-being and stress management, in particular via devices based on biofeedback, regulation of the autonomic nervous system, and sensory therapy, and more particularly the field of multimodal relaxation using sound and vibration stimulation to induce a state of relaxation in the user, inspired by the purring of cats.

[0002] Chronic stress has become a pervasive component of modern life, affecting the mental and physical health of millions of people worldwide. Exacerbated by daily factors such as work pressures, cognitive overload, and constant digital stimuli, sustained stress triggers a continuous neurochemical response in the body, involving a prolonged release of cortisol, the stress hormone. This hyperactivity can cause long-term problems, such as mood disorders, decreased immunity, poor sleep quality, and an increased risk of cardiovascular disease.

[0003] The persistence of these triggers also leads to excessive activation of the sympathetic nervous system (the "fight or flight" response), which disrupts the regulation of autonomic systems, such as heart rate and respiration. Heart rate variability (HRV), an indicator of autonomic nervous system health, tends to decrease in situations of chronic stress, limiting resilience and recovery capacity. When the hypothalamic-pituitary-adrenal (HPA) axis is continuously activated due to chronic stress, there is a prolonged imbalance in cortisol secretion. This contributes to various disorders, including anxiety, depression, cardiovascular disease, and metabolic dysfunction.

[0004] The purr of cats has always been recognized for its calming effect on humans, generating a feeling of security and relaxation. Science has shown that this low-frequency sound, generally between 20 and 150 Hz, promotes stress reduction by inducing deep relaxation. By mimicking these frequencies, our device harnesses the power of purring to relax the user on both a physiological and psychological level, creating a state of calm and well-being. A cat's purr is often associated with a calming and therapeutic effect, whether to help manage stress and anxiety or simply to provide comfort. Studies have shown that the low frequencies of purring (between 25 and 150 Hz) can have beneficial effects on the nervous system, notably by promoting relaxation and lowering blood pressure.

[0005] These products, whether in the form of plush toys, applications or electronic devices, are therefore designed to reproduce these benefits in a context where one cannot always have a real cat nearby.

[0006] Studies have precisely characterized the effects of purring, particularly its impact on heart rate regulation, the reduction of cortisol (the stress hormone), and the stimulation of endorphin production. As a central element of the device, the purring, reproduced both audibly and vibratorically, becomes an active stress reliever, creating a soothing sound environment and altering stress perception throughout the day.

[0007] There are several products on the market that simulate a cat's purr. These products are often designed to offer a soothing and relaxing experience, recreating the comforting sensation and sound of purring.

[0008] These products come in various forms, such as interactive purring plush toys that simulate a cat's purr to help calm anxiety and provide comfort, or interactive plush toys for the elderly or those needing emotional support. These plush toys mimic a cat's behavior, notably by simulating a purr when petted or held. They incorporate touch sensors to detect contact and initiate a purring simulation. A small vibration motor and a low-frequency sound generator are integrated to produce both the vibrations and the sound associated with purring.

[0009] Some wellness or meditation apps include cat purring sounds among their soothing audio options (e.g., "Purrli™, an online app that generates a realistic purr).

[0010] Some vibration relaxation devices include programs that mimic humming for its soothing effects. These devices use low-frequency sounds combined with gentle vibrations. Apps often offer customizable humming recordings (frequency, intensity, etc.). Electronic relaxation devices can be programmed to generate synchronized sounds and vibrations to mimic the effects of humming.

[0011] The Purr Pillow™ is another example of a device that mimics a cat's purr. It's often used for pets or people seeking comfort. The pillow emits a purring sound when pressed. The purr is produced by a small internal electronic device that emits a low-frequency sound and a gentle vibration to simulate the sensation of a purring cat. These devices can be used as calming tools, especially for children or anxious pets. State of the art

[0012] The prior art includes US patent application US2020245931, which describes a relaxation device equipped with a vibratory stimulation generator controlled by physiological data (cardiac, electrodermal, etc.). The device, integrated into a chest-worn accessory, adapts its vibrations to the user's detected emotional state via algorithms. It is designed to improve heart rate variability. The two transducers are applied to the chest at the level of the rib cage.

[0013] US patent application US2022233860 describes a neuromodulation device that detects a physiological rhythm (breathing or ECG) and then applies electrical impulses to alleviate stress, pain, or inflammation. The entire therapy is therefore based on transcutaneous electrical nerve stimulation (taVNS) with modulated amplitude and rate.

[0014] Application WO2024165722A1 relates to a multi-zone skin stimulation interface using vibrating motors placed at defined locations on the torso or arms. It describes the generation of vibratory patterns for the purpose of relaxation or body arousal, but does not mention a vibratory source based on a biomimetic signal such as a cat's purr. The signal is generated by a controlled motor, unrelated to natural animal frequencies.

[0015] Application US20140114142A1 proposes a cardiac monitoring pendant that includes ECG sensors and an accelerometer. The device is intended to collect medical data, including body position and cardiac activity. It does not include any vibration or sound modules, active relaxation functions, or any mention of animal purring-inspired signals. Its purpose is purely diagnostic.

[0016] Application US20070100262 describes a wrist-worn wellness device that emits gentle vibrations, evoking a sensation "similar to a cat's purr." However, this comparison is purely qualitative. It is therefore not a precise technical teaching but a sensory metaphor. Disadvantages of prior art

[0017] Prior art solutions are not entirely satisfactory as they passively provide simulations of cat purring, possibly with user gesture interaction to activate or deactivate the device.

[0018] Furthermore, it appears that simply simulating a cat's purr produces only random and poorly controlled effects in terms of their physiological impact.

[0019] None of the solutions offer an improved relaxation device capable of effectively acting on the autonomic nervous system by reproducing a naturally soothing signal, promoting deep vagal stimulation. Solution provided by the invention

[0020] To remedy these drawbacks, the present invention proposes a relaxation device comprising a vibratory frequency generator of cat purring characterized in that said generator is integrated into a housing having a means of positioning on the solar plexus of a user.

[0021] Depending on the variant, the said means of positioning on the solar plexus of a user consists of an abdominal band, a necklace or a bra.

[0022] According to other variants, the device also includes an ECG (electrocardiogram) sensor and / or an oxygen saturation sensor and / or a motion sensor including an accelerometer and a gyroscope, whose signals drive said frequency generator to automatically adjust the vibration and sound frequencies of the device.

[0023] Advantageously, said vibration frequency generator produces low frequency sounds between 20 Hz and 150 Hz and a vibration generator synchronized with the sound, producing pulses in a range of 10 Hz to 35 Hz.

[0024] The technical advantage of the invention lies in its continuous and dynamic approach. Unlike solutions that focus on one-off sessions, the device according to the invention operates autonomously throughout the day, creating a consistently calm and intuitive environment. Through physiological stimulation of the solar plexus, our device gently activates the vagus nerve and adjusts its pulses from 10-35 Hz to provide lasting calm to the nervous system, thereby contributing to increased resilience to stress.

[0025] The invention is distinguished by its continuous and autonomous, multimodal activation approach, capable of generating different vibrations simultaneously, designed to accompany users throughout the day. Centered on a purring sound, it acts as a soothing companion, promoting natural relaxation by stimulating the solar plexus, a key area for regulating the nervous system. Connected in real time to HRV, oxygen saturation (SpO2), and respiration measurements, it dynamically adapts to the user's needs, offering personalized soothing.

[0026] The device according to the invention can be used as a desensitization method by creating a consistently relaxing environment during mild and repeated exposure to movement stimuli. Low-frequency vibrations and pulses in the 10–35 Hz range, applied to the solar plexus, elicit a gentle vagus nerve-regulating response, helping to reduce the perception of movement and associated anxiety. By synchronizing these vibrations with soothing purring sounds, our device creates a calming sensory experience, reducing sensory dissonance and promoting increased tolerance to movement.

[0027] Detailed description of a non-limiting example of implementation

[0028] The present invention will be better understood upon reading the following description, concerning a non-limiting example of an embodiment illustrated by the accompanying drawings where:

[0029] The figure is a schematic view of an example of a device according to the invention.

[0030] The figure is a schematic view of the positioning of an example of a device according to the invention.

[0031] The figure is the schematic diagram of the electronic circuit of the invention. Principle of the invention

[0032] The invention is based on the following technical choices: Use of cat purring as a specific vibratory signal: This approach is based on scientific publications demonstrating that frequencies between 25 and 150 Hz (particularly around 25–50 Hz) have measurable calming effects, notably through indirect stimulation of the vagus nerve. Vibratory and / or audible reproduction of this signal: Unlike the algorithmically driven artificial vibrations in D1, here the signal is predefined, biomimetic, and reproducible. Targeted positioning on the solar plexus using a dedicated device: The solar plexus is an area known for its access to the parasympathetic network (celiac plexus and vagus nerve). D1 does not teach this positioning or the associated neurophysiological impact.

[0033] The "cat purr" is a well-documented and studied phenomenon in biomedical literature, particularly for its soothing properties: It is associated with specific frequencies between 20 and 150 Hz, with a potential therapeutic effect on the autonomic nervous system, bones, blood pressure, etc.

[0034] The device according to the invention consists of a housing (100) containing the technical elements of stimulation and biofeedback, housed in a modular support accessory (200) constituting a means of positioning in contact with the solar plexus of the user.

[0035] The solar plexus is an area located at the front of the body, just below the sternum, between the diaphragm and the stomach. It lies approximately in the upper abdomen, just below the rib cage. The solar plexus contains numerous nerves, including those connected to the autonomic nervous system, which control several abdominal organs such as the stomach, liver, and kidneys.

[0036] In anatomy, the solar plexus, also known as the celiac plexus, is a network of nerves located around the abdominal aorta. It plays an important role in regulating visceral functions such as digestion and respiration. This area is particularly well-suited for positioning the device according to the invention because stimulation of the solar plexus can have a calming effect by acting on the parasympathetic nervous system, notably via the vagus nerve, thus promoting deep relaxation.

[0037] The positioning device can consist of three interchangeable modular support accessories, allowing for a customized and comfortable fit according to the user's preferences. This modular design optimizes the device's functionality while offering customizable options for discreet, everyday use. The support accessories (200) include, for example, a neckband for wearing the device (100) like a pendant under clothing, an abdominal band, or, as illustrated in the accompanying figures, a bra, also worn under clothing. In this non-limiting example, the bra consists of a strap (210) and a soft cup (220) into which the device (100) is inserted. The strap (210) goes around the neck via an upper loop and around the abdomen via a lower loop. Tightening the strap (210) allows the bra (200) to be adjusted to the wearer's body shape.Optionally, a spring is provided between the bottom of the shell (220) and the bottom of the casing (100) to push the front surface of the casing towards the patient's skin and improve vibration transmission.

[0038] The central unit (100) is the heart of the device, containing the electronic components, sensors, and vibration and sound stimulation modules. It is designed to be easily clipped on and interchangeable with the various attachment accessories (200). It features an outer shell made of durable, hypoallergenic, medical-grade silicone for comfortable extended wear. It is also designed to be waterproof and shock-resistant to protect the electronic circuits from moisture and impacts. The unit is compatible with accessories that provide a stable fit while remaining suitable for discreet everyday use. Typically, the unit measures 5 cm long, 3 cm wide, and 1 cm thick, offering a discreet size for wearing under clothing at the solar plexus.

[0039] The support means (200) may consist of a band that provides a snug fit around the chest, inspired by sports bras, and designed to hold the device in place stably and comfortably.

[0040] The headband is made of a soft, breathable, and elastic fabric for optimal comfort, even during extended wear. It features adjustable straps to accommodate different body shapes and provide a personalized fit. It is ideal for users seeking a discreet and reliable solution for precise positioning on the solar plexus. This positioning method ensures direct contact between the device and the solar plexus, optimizing the transmission of vibrations and impulses for continuous stimulation.

[0041] The collar offers a more discreet and elegant positioning option (200), allowing the device to be worn around the neck. It is designed to be aesthetically pleasing, with hypoallergenic materials that make it comfortable for extended wear.

[0042] The case can be inserted into a secure location in the center of the collar, which positions it close to the solar plexus without creating excessive pressure.

[0043] The discreet design is suitable for use in social environments, where the device can be worn as a fashion accessory while providing the benefits of stimulation.

[0044] An intermediate option combines the advantages of a headband and neckband to offer flexible support that adapts to various situations and wearing preferences. It allows for a snug fit while offering flexibility in positioning, suitable for both comfortable and discreet wear. With a moderate tightening system, this accessory is designed for users seeking a lightweight alternative that allows for device adjustment without constricting the solar plexus. This accessory is particularly useful for users who need adjustable support to easily transition from casual to formal environments.

[0045] Multimodal sound and vibration stimulation system

[0046] The unit incorporates an electronic circuit that provides the functions of generating vibration and sound signals, and of control by signals from physiological sensors.

[0047] This electronic circuit provides a signal replicating a cat's natural purr by generating the vibrational frequencies of a cat's purr (20 to 150 Hz), with an optimal peak between 25 and 50 Hz to maximize the relaxation effect. This sound is played continuously to create a soothing atmosphere and enhance the feeling of calm.

[0048] The vibration generator also produces low-frequency pulses (10-35 Hz), specifically targeting the solar plexus to modulate the autonomic nervous system and promote dopamine release. These low-frequency pulses influence emotional regulation and support overall calming.

[0049] In addition, the vibration generator produces gentle, continuous vibrations in the range of 25 to 50 Hz to induce tonic stimulation of the vagus nerve, promoting background relaxation throughout the day.

[0050] This toning promotes the activation and strengthening of the vagus nerve to improve the response of the parasympathetic nervous system, which is responsible for rest and digestion. It can be achieved in various ways, including through low-frequency sounds and vibrations, to improve heart rate variability (HRV), an indicator of a healthy autonomic nervous system, and to promote a state of deep calm.

[0051] The electronic circuit also includes a sound generator: The purring sound can be accompanied by soothing frequencies (432 Hz and 528 Hz) to support emotional regulation, accessible via connected headphones.

[0052] The low-frequency vibration generator reproduces the specific frequencies of purring, while also being programmable to generate distinct infrasonic toning pulses.

[0053] The high-fidelity sound generator delivers an audio signal to an output, for example a jack or a Bluetooth module for the diffusion of therapeutic frequencies and infrasonic toning via headphones or the unit, without altering the quality of the vibrations.

[0054] The electronic circuit advantageously features an advanced ARM Cortex microcontroller to simultaneously manage different types of vibration and sound signals, with sufficient memory to store and adjust programs in real time.

[0055] Stimulation of the solar plexus maximizes vagus nerve activation, providing a rapid connection to the autonomic nervous system. Compared to wrist-worn devices, this placement allows for a profound effect on visceral relaxation, heart rate regulation, and stress management. Respiratory sensors, HRV and SpO2:

[0056] The electronic circuit advantageously includes an ECG sensor and an SpO2: our device continuously measures HRV and oxygen saturation, monitoring the user's physiological responses to adapt vibrations and pulses in real time by the signals from its two sensors.

[0057] The electronic circuit also advantageously includes an IMU module for advanced respiratory movement tracking and stimulation adaptation: Within the device, an IMU (Inertial Measurement Unit) module, composed of an accelerometer and a gyroscope, ensures precise tracking of respiratory movements and changes in body orientation. Unlike a simple accelerometer, the IMU captures the micromovements associated with breathing and the user's orientation, thus optimizing the synchronization of vibratory and auditory stimulation with the respiratory rhythm. This ability to adapt the protocols according to the user's posture and activity (standing, sitting, lying down) increases the effectiveness of our device as a relaxation and stress management tool. This technology also allows for automatic adjustment for a personalized experience, while ensuring seamless use throughout the day. Computer module and internal memory:

[0058] As an example, the electronic circuit uses a 16-32 MHz microprocessor to simultaneously control pulses, vibrations, and sounds based on physiological measurements. A 1 MB memory stores the stimulation protocols.

[0059] The stimulation modes are adjusted according to perceived stress and physiological data for a personalized experience. Mobile application:

[0060] The electronic circuit is connected to a mobile application that displays HRV, SpO2, and respiration data. The user can track their progress and adjust the relaxation and desensitization modes.

[0061] Offering heart coherence exercises, stress management and relaxation, the application allows on-demand sessions to improve mental well-being and resilience.

[0062] Schematic diagram for the multimodal sound and vibration stimulation system: Schematic diagram of the electronic circuit

[0063] By way of non-limiting example, the figure illustrates the schematic diagram of an electronic circuit of a device according to the invention.

[0064] It includes a low-frequency vibration generator module (20) producing vibratory pulses in the 10-35 Hz range to stimulate the solar plexus and vagus nerve, and also continuous vibrations in the 25-50 Hz range for vagus nerve toning. The signals are delivered to a haptic transducer (21) located on the front face of the housing (100).

[0065] The sound generator (30) produces sounds at specific frequencies (432 Hz and 528 Hz). It includes an oscillator, modulated in amplitude to recreate volume variations and in frequency to simulate fluctuations. White noise is added to enrich the texture of the hum. The final signal is amplified by an amplifier (31) and transmitted to a Bluetooth module (32), a headphone jack (33), or a low-frequency speaker integrated into the casing (100).

[0066] The circuit also includes physiological sensors (10 to 12) integrated into the housing (100) or from connected peripheral equipment.

[0067] An ECG (Electrocardiogram) sensor (10) provides a signal representative of the heart rhythm to synchronize the vibrations emitted by the vibration generator (20).

[0068] An SpO2 (Oxygen Saturation) sensor (11) provides a signal based on oxygen saturation to adjust the stimulation.

[0069] A respiratory motion and posture sensor (12) IMU (Inertial Measurement Unit) consisting of an accelerometer and a gyroscope provides information on the user's respiratory movements.

[0070] Heart rate variability (HRV), which measures the autonomic nervous system's response to stimuli, is obtained by processing the signal from the ECG sensor (10) by analyzing variations in the time interval between each heartbeat, i.e., variations in the RR or NN intervals (between the R waves of successive beats on an ECG). These variations provide valuable information about the balance between the sympathetic and parasympathetic nervous systems. Alternatively, signals can come from a user-worn photoplethysmogram (PPG) sensor (e.g., a smartwatch, which uses an optical sensor to measure blood flow in vessels). Although less precise than ECG, it can provide acceptable estimates of HRV.

[0071] In the device according to the invention, the ECG (10), SpO2 (11), and IMH (12) sensors deliver signals processed by a microcontroller (50) that drives the vibration (20) and sound (30) generators for real-time adaptation of the sound and vibration stimuli. The ECG sensor continuously measures the heart's electrical activity, including the RR intervals between beats, which are used to calculate heart rate variability (HRV). This data is then analyzed to provide information on the user's state of relaxation or stress. For example, a high HRV indicates a state of relaxation, while a low HRV may indicate a state of stress or sympathetic nervous system activation.

[0072] The signals captured by the ECG are transmitted to the microcontroller(50), for example a Cortexmented ARM, which processes this data in real time.

[0073] The microcontroller compares HRV data and other physiological measurements (such as oxygen saturation measured by the SpO2 sensor (11) and respiratory movements measured by the IMU module) (12) to adjust the stimulation modes.

[0074] If the ECG detects a state of stress (e.g., low HRV), the microcontroller (50) commands the low-frequency vibration generator (20) to activate low-frequency vibration pulses (10-35 Hz) and stimulate the solar plexus and promote relaxation by modulating the autonomic nervous system.

[0075] To enhance background relaxation, the device also adjusts the vibration frequency in the range of 25-50 Hz to tone the vagus nerve and enhance the resting and digestive (parasympathetic) state.

[0076] The ECG sensor (10) can also influence the sound generation (30). Based on HRV data, the microcontroller (50) adjusts the diffusion of soothing sounds, such as frequencies of 432 Hz and 528 Hz, which are known to support emotional regulation and soothe the user.

[0077] The cat's purring sound, combined with these frequencies, can be adjusted according to the user's physiological response, thus providing a more effective sound immersion to calm the mind.

[0078] By combining data from the ECG sensor (10) with that from the respiratory sensor (IMU) (12) and the SpO2 sensor (11), the device provides a biofeedback loop. This allows for real-time adjustment of both sounds and vibrations to synchronize the stimulation with the user's immediate physiological needs.

[0079] For example, if the ECG detects a decrease in HRV (a sign of stress), vibration and sound generators can increase the intensity of calming stimuli to counteract this state.

[0080] By providing a continuous measurement, the ECG allows the system to personalize stimuli for each user. This means that the sound and vibration generators will not produce predefined patterns, but will constantly adapt to cardiac and respiratory data.

[0081] This personalization increases the effectiveness of the device, as each user receives vibration and sound signals adapted to their current state of stress or relaxation.

[0082] In summary, the ECG sensor (10) collects HRV data, which is then processed by the microcontroller (50). Based on physiological signals, the vibration (20) and sound (30) generators adjust their frequency and intensity to modulate emotional state and stimulate the parasympathetic nervous system. This creates a dynamic feedback loop where the device adjusts in real time, providing a personalized stress management and relaxation experience. Thus, the interaction between the ECG sensor and the sound and vibration generators creates an optimized relaxation experience tailored to each user's physiological needs.

Claims

Relaxation device comprising a housing (100) equipped with a holding means (200) and a vibratory frequency generator characterized in that said generator simulates a cat's purr and in that said housing (100) having a positioning means (200) on the solar plexus of a user. Relaxation device according to claim 1 characterized in that said positioning means (200) on the solar plexus of a user is constituted by an abdominal band. Relaxation device according to claim 1 characterized in that said positioning means (200) on the solar plexus of a user is constituted by a collar. Relaxation device according to claim 1 characterized in that said positioning means (200) on the solar plexus of a user is constituted by a bra. Relaxation device according to claim 1 characterized in that it further comprises an ECG (electrocardiogram) sensor (10) whose signals control said frequency generator to automatically adjust the vibration and sound frequencies of the device. Relaxation device according to claim 1 characterized in that it further comprises an oxygen saturation sensor (11) whose signals control said frequency generator to automatically adjust the vibration and sound frequencies of the device. Relaxation device according to claim 1 characterized in that it further comprises a motion sensor (12) including an accelerometer and a gyroscope, the signals of which control said frequency generator to automatically adjust the vibration and sound frequencies of the device. Relaxation device according to claim 1 characterized in that said vibratory frequency generator produces low frequency sounds (20) between 20 Hz and 150 Hz and in that said device further comprises a sound-synchronized vibration generator (30), producing pulses in a range of 10 Hz to 35 Hz.

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