High-stretchability film type portable detection equipment for measuring human brain waves

Abstract

The invention provides a high-stretchability thin film type portable detection device for measuring human brain waves, and relates to the technical field of flexible electronics, and the high-stretchability thin film type portable detection device comprises a substrate layer which is a flexible PDMS thin film; the conductive layer is prepared by printing conductive silver paste on the substrate layer through a direct-writing printing process; the bonding layer is used for connecting and fixing the conductive layer and the electrode layer; the electrode layer comprises a plurality of microneedle electrodes and further comprises a signal processing unit; the density, softness and shape of the microneedle electrode are dynamically adjusted according to different scalp states, adaptive adjustment of the supporting strength and position of the substrate layer is combined, and the signal processing unit intelligently optimizes the receiving sensitivity, the processing flow and the transmission path, so that adaptive fitting of the device to scalp environments of different users is realized, and the scalp quality is improved. The stability and accuracy of electroencephalogram signal collection are improved, and meanwhile the wearing comfort and portability are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flexible electronics, in particular to a high-stretchability thin film type portable detection device for measuring human brain waves. BACKGROUND

[0002] With the increasing demand for electroencephalogram monitoring technology in the field of modern medical health, wearable electroencephalogram detection devices have become a research hotspot. In the fields of neuroscience research, sleep monitoring, rehabilitation treatment, etc., the device needs to accurately collect electroencephalogram signals during daily activities. At the same time, the progress of flexible electronics technology provides technical support for the development of high-stretchability, lightness, and portable detection devices, prompting researchers to explore more optimized electroencephalogram detection solutions.

[0003] Most of the traditional electroencephalogram detection devices are bulky and complex in structure, and need to be operated by professionals in a professional medical environment, which limits their application scenarios. Moreover, the electrodes of these devices have poor contact with the scalp, are greatly affected by hair and grease, and the signal collection is unstable, so the accuracy of the detection results cannot be guaranteed. In addition, the devices have poor stretchability, are not comfortable to wear, and are prone to cause discomfort to users after long-term use, which cannot meet the demand for long-term monitoring in daily life.

[0004] Therefore, it is necessary to design a high-stretchability thin film type portable detection device for measuring human brain waves to solve the problems of the prior art, such as large volume, inconvenient operation, great influence of the scalp environment on signal collection, poor stretchability, and uncomfortable wearing. The device can stably collect electroencephalogram signals in different scenarios by intelligently adjusting the electrode characteristics, optimizing the underlying support, and signal processing mechanism, and improve the user experience. SUMMARY

[0005] In view of this, the present application provides a high-stretchability thin film type portable detection device for measuring human brain waves, aiming to solve the problem of how to realize stable collection of electroencephalogram signals by the device under different scalp conditions, and ensure comfortable wearing and convenient operation.

[0006] In one aspect, the present application provides a high-stretchability thin film type portable detection device for measuring human brain waves, comprising: a substrate layer, which is a flexible PDMS thin film; a conductive layer, which is arranged on the top surface of the substrate layer, and is used to provide a conductive connection; an adhesive layer, which is arranged on the top surface of the conductive layer, and is used to connect and fix the conductive layer and the electrode layer; an electrode layer, which is arranged on the top surface of the adhesive layer, and contains a plurality of microneedle electrodes, and a signal processing unit is arranged in the electrode layer; The signal processing unit is configured to adjust the contact mode of the microneedle electrode with the scalp to be a first contact mode or a second contact mode according to the hair coverage degree and the sebum secretion degree; The signal processing unit is further configured to adjust the support strength and the support position of the substrate layer according to the weight and the gravity center offset of the electrode layer; The signal processing unit is further configured to adjust the signal receiving sensitivity and the signal receiving bandwidth according to the signal intensity and the signal fluctuation frequency collected by the microneedle electrode; The signal processing unit is further configured to adjust the processing flow complexity of the signal according to the processing complexity of the signal and the external electromagnetic interference intensity; The signal processing unit is further configured to adjust the transmission speed of the signal according to the transmission path length of the signal.

[0007] Further, the conductive layer is made by printing the conductive silver paste to the substrate layer through a direct writing printing process; One end of the microneedle electrode is provided with a micro needle structure, and the other end of the microneedle electrode is fixed to the top surface of the conductive layer through the adhesive layer; The top surface of the substrate layer is provided with a plurality of electrode positions.

[0008] Further, when the signal processing unit adjusts the contact mode of the microneedle electrode with the scalp to be a first contact mode or a second contact mode according to the hair coverage degree and the sebum secretion degree, the signal processing unit comprises: The preset hair coverage degree is , the hair coverage threshold is , the sebum secretion degree is , and the sebum secretion threshold is ; When > and > , the electrode layer adopts the first contact mode; When and , the electrode layer adopts the second contact mode; When the signal processing unit adopts the first contact mode, the signal processing unit is configured to preset the initial density of the microneedle electrode to be , and the density threshold is ; When < , the signal processing unit increases the density of the microneedle electrode to be ; When = The signal processing unit keeps the density of the microneedle electrode unchanged when The signal processing unit reduces the density of the microneedle electrode to when The signal processing unit is further configured to preset the initial softness of the microneedle electrode as and the softness threshold as when the second contact mode is adopted. The signal processing unit increases the softness of the microneedle electrode to when The signal processing unit keeps the softness of the microneedle electrode unchanged when The signal processing unit reduces the softness of the microneedle electrode to when The signal processing unit adjusts the density of the microneedle electrode, and preset the adjustment time as

[0009] The signal processing unit keeps the shape of the microneedle electrode unchanged when The signal processing unit continues to adjust the density of the microneedle electrode according to the current adjustment strategy when The signal processing unit suspends the adjustment of the density of the microneedle electrode when The signal processing unit adjusts the shape of the microneedle electrode when The signal processing unit adjusts the shape of the microneedle electrode, and adjusts the microneedle electrode to be frustum-shaped when The signal processing unit adjusts the shape of the microneedle electrode to be cylindrical when The signal processing unit adjusts the shape of the microneedle electrode to be conical when The signal processing unit adjusts the softness of the microneedle electrode, and preset the change speed as The change duration is​​​​​​​​​​​​​​​​​​​​​ , the duration threshold is ; When , , the signal processing unit accelerates the changing speed of softness to ; When = , the signal processing unit maintains the current changing speed of softness; When > , the signal processing unit controls the duration of the change, if , , the preset , , if = , the preset = , if > , the preset > .

[0010] Further, when the signal processing unit adjusts the support strength and support position of the base layer according to the weight and center of gravity offset of the electrode layer, it further comprises: The weight of the electrode layer is preset as , the center of gravity offset is , the weight threshold is , the offset threshold is , the support strength of the base layer is , the support strength threshold is , The adjustment coefficient of , and The initial value of , and The initial value of When , and , , the signal processing unit maintains the current support strength and the current support position unchanged; When = and = , the signal processing unit fine-tunes the support strength and the support position, and the fine-tuning rule is: Support strength fine-tuning: , wherein is the weight of the last moment, is the center of gravity offset of the previous moment, and are fine tuning coefficients, both less than 0.1; Support position fine tuning: , wherein is the support position offset of the previous moment, and are fine tuning coefficients, both less than 0.1.

[0011] Further, when > and > , the signal processing unit enhances the support strength and adjusts the support position, and the preset enhanced support strength is ; If < , the signal processing unit adopts a mild local enhancement method, that is, , wherein and are mild enhancement coefficients between 0.1 and 0.3; If = , the signal processing unit adopts a moderate overall enhancement method, that is, , wherein and are moderate enhancement coefficients between 0.3 and 0.6; If > , the signal processing unit adopts a severe overall enhancement method, that is, , wherein and are severe enhancement coefficients between 0.6 and 1.0; The support position adjustment is , wherein and are coefficients determined according to different enhancement methods.

[0012] Further, the signal processing unit is also used to adjust the signal receiving sensitivity and signal receiving bandwidth according to the signal strength and signal fluctuation frequency collected by the microneedle electrode, comprising: The signal processing unit receives the signal of the electrode layer, and the preset signal strength is , the signal fluctuation frequency is , the signal strength threshold is , the signal fluctuation frequency threshold is , the signal receiving sensitivity is , and the signal receiving sensitivity threshold is , the signal receiving sensitivity adjustment coefficient is , and the initial value of the signal receiving bandwidth adjustment coefficient is 1, and , and the initial value of the signal receiving bandwidth adjustment coefficient is 1; when < and < , the signal receiving unit reduces the receiving sensitivity and narrows the receiving bandwidth, wherein the reduction rule is , , wherein and are both reduction coefficients between 0.1 and 0.3; when = and = , the signal receiving unit maintains the current signal receiving sensitivity and the current signal receiving bandwidth unchanged; when > and > , the signal receiving unit increases the receiving sensitivity and adjusts the receiving bandwidth, and the preset increased receiving sensitivity is .

[0013] Further, if < , the signal receiving unit adopts a mild increase mode, i.e. , , wherein and are both mild increase coefficients between 0.1 and 0.3; if = , the signal receiving unit adopts a moderate increase mode, i.e. , , wherein and are both moderate increase coefficients between 0.3 and 0.6; if > , the signal receiving unit adopts a severe increase mode, i.e. , , wherein and are both severe increase coefficients between 0.6 and 1.0.

[0014] Further, the signal processing unit is further configured to adjust the processing flow complexity of the signal according to the processing complexity of the signal and the intensity of the external electromagnetic interference, comprising: The preset processing complexity of the signal processing unit when converting and preliminarily processing the signal is , the processing complexity threshold is , the intensity of the external electromagnetic interference is , the intensity threshold of the external electromagnetic interference is , the processing flow adjustment coefficient is , and the initial value of is 1; When < , the signal processing unit simplifies the processing flow, and the simplification rule is , wherein is a simplification coefficient between 0.1 and 0.3; When = , the signal processing unit maintains the current processing flow; When > , the signal processing unit adjusts the processing flow, if < , the signal processing unit adopts a simple flow processing, that is, , wherein is a simple flow coefficient between 0.1 and 0.3; if = , the signal processing unit adopts a standard flow processing, that is, ; if > , the signal processing unit adopts a complex flow processing, that is, , wherein is a complex flow coefficient between 0.6 and 1.0.

[0015] Further, the signal processing unit is further configured to adjust the transmission speed of the signal according to the transmission path length of the signal, comprising: The preset transmission path length of the signal processing unit when planning the signal transmission path is , the transmission path length threshold is , the transmission speed is , the transmission speed threshold is , the transmission speed adjustment coefficient is , and the initial value of is 1; When < , the signal processing unit increases the transmission speed, and the increasing rule is , wherein is an increase coefficient of 0.1-0.3; When = , the signal processing unit keeps the current transmission speed unchanged; When > , the signal processing unit adjusts the transmission speed, if < , the signal processing unit adopts a low-speed transmission method, that is , wherein is a low-speed adjustment coefficient of 0.1-0.3; if = , the signal processing unit adopts a transmission speed of =1 for signal transmission; if > , the signal processing unit adopts a high-speed transmission method, that is , wherein is a high-speed adjustment coefficient of 0.6-1.0.

[0016] Compared with the prior art, the present application has the following advantages: 1. From the device structure and electrode adaptability, the flexible PDMS thin film base layer ensures the high stretchability of the device, improving the wearing comfort. The microneedle electrode of the electrode layer can adjust the density and softness according to the hair coverage and sebum secretion, and can well contact the scalp under different scalp conditions, ensuring stable collection of electroencephalogram signals. For example, in the case of dense hair and excessive sebum secretion, the signal collection effect can be maintained by increasing the density of the microneedle electrode.

[0017] 2. From the overall performance optimization of the device, the base layer will intelligently adjust the support strength and position according to the weight and center of gravity of the electrode layer, ensuring the stability of the device and improving the wearing experience. The signal processing unit can automatically adjust the receiving sensitivity, processing flow and transmission path according to the signal strength, fluctuation frequency, external electromagnetic interference and other factors, improve the signal processing efficiency and accuracy. When the signal is weak, the receiving sensitivity is improved, and when the interference is strong, a complex processing flow is adopted to effectively identify and process the electroencephalogram signals and reduce the influence of interference. In summary, the present application realizes stable detection of the device in complex scalp environment, improves portability, comfort and detection accuracy, and has significant advantages in the field of electroencephalogram monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to limit the application thereto. Like reference numerals are used to refer to like elements throughout. In the drawings: Fig. 1 A schematic diagram of a high-stretchability thin film type portable detection device for measuring human brain waves according to an embodiment of the present application; Fig. 2 A partial enlarged view of a high-stretchability thin film type portable detection device for measuring human brain waves according to an embodiment of the present application; In the drawings: 100 - electrode layer; 200 - adhesive layer; 300 - conductive layer; 400 - base layer; 500 - signal processing unit; 210 - device end; 220 - base opening; 1-20 electrode sites. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application will be further described with reference to the drawings and examples. The following examples are intended to illustrate the present application and are not intended to limit the scope of the present application.

[0020] In the description of the present application, it is to be understood that the orientation or positional relationship indicated by terms such as "central", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0021] The terms "first", "second", etc. are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the term "a plurality of" means two or more.

[0022] In the description of the present application, it is to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] Reference is made to Figs. 1-2The embodiment shown provides a high-stretchability thin film type portable detection device for measuring human brain waves, comprising a substrate layer 400, which is a flexible PDMS film; a conductive layer 300 arranged on the top surface of the substrate layer 400, the conductive layer 300 being used to provide conductive connection; an adhesive layer 200 arranged on the top surface of the conductive layer 300, the adhesive layer 200 being used to connect and fix the conductive layer 300 and the electrode layer 100; an electrode layer 100 arranged on the top surface of the adhesive layer 200, the electrode layer 100 comprising a plurality of microneedle electrodes, and the electrode layer 100 being internally provided with a signal processing unit 500; the signal processing unit 500 being used to adjust the contact mode of the microneedle electrodes with the scalp to be a first contact mode or a second contact mode according to the hair coverage degree and the grease secretion degree; the signal processing unit 500 being further used to adjust the support strength and the support position of the substrate layer 400 according to the weight and the gravity center offset of the electrode layer 100; the signal processing unit 500 being further used to adjust the signal receiving sensitivity and the signal receiving bandwidth according to the signal strength and the signal fluctuation frequency collected by the microneedle electrodes; the signal processing unit 500 being further used to adjust the signal processing flow complexity according to the signal processing complexity and the external electromagnetic interference strength; the signal processing unit 500 being further used to adjust the signal transmission speed according to the signal transmission path length.

[0024] Specifically, the hydrogel microneedle electrode as the electrode layer 100 has a microneedle-containing side in contact with the human skin and a microneedle-free side in contact with the conductive adhesive tape as the adhesive layer 200. The whole electroencephalogram cap has 1-20 electrode sites for placing the hydrogel microneedle electrode. The adhesive layer 200 is in contact with the silver paste circuit as the conductive layer 300. The preparation of the substrate layer 400: the material is PDMS (polydimethylsiloxane), which is mixed according to the manufacturing requirements, stirred uniformly, vacuum degassed to remove bubbles, the mixed liquid is coated, placed in a constant temperature drying oven for curing, and taken out for standby. The preparation of the conductive layer 300: the circuit diagram is drawn by using the plane design software AutoCAD, and is exported in the two-dimensional drawing format. The conductive silver paste is accurately printed on the PDMS film substrate according to the designed circuit diagram on the direct writing printer. After printing, it is placed in an oven for silver paste curing treatment to ensure the stability and adhesion of the conductive layer 300. The laser cutting machine is used to accurately cut the device according to the designed outer contour to ensure the overall size and edge quality of the device. The adhesive layer 200 is set: the double-sided conductive adhesive tape is used as the adhesive layer 200 to connect the conductive layer 300 and the electrode layer 100. The conductive adhesive tape cut into a suitable shape is pasted on the preset electrode site to ensure good contact between the adhesive tape and the silver paste circuit. The electrode layer 100 is installed: the electrode material is the hydrogel microneedle electrode. The microneedle electrode has a small needle-like structure on one side for slightly penetrating the skin surface to reduce the contact impedance and improve the signal quality. The back of the microneedle electrode is fixed on the conductive layer 300 through the conductive adhesive tape to ensure smooth signal transmission between the electrode and the circuit. According to the international standard 10-20 electrode system, 20 electrode sites are arranged on the flexible substrate, and the microneedle electrodes are installed respectively.

[0025] When worn, the electrode site 10 needs to be placed on the position above the center of the head. The end 210 of the device is connected to the FPC conversion version, which can be converted with the standard DuPont line to realize the quick docking of the device with the external data acquisition circuit and support the modular expansion of the device. The elastic band is passed through the opening 220 of the substrate, and the band is tightened according to the size of the head to fix it.

[0026] In some embodiments of the present application, the conductive layer 300 is made by printing the conductive silver paste onto the substrate layer 400 through a direct writing printing process; One end of the microneedle electrode is provided with a small needle-like structure, and the other end of the microneedle electrode is fixed on the top surface of the conductive layer 300 through the adhesive layer 200; The top surface of the substrate layer 400 is provided with a plurality of electrode sites.

[0027] In some embodiments of the present application, the signal processing unit 500 is further configured to, when adjusting the contact mode of the microneedle electrode with the scalp according to the hair coverage degree and the sebum secretion degree to be the first contact mode or the second contact mode, include: a preset hair coverage degree is , a hair coverage threshold is , a sebum secretion degree is , and a sebum secretion threshold is ; when > and > , the electrode layer 100 adopts the first contact mode; when and , the electrode layer 100 adopts the second contact mode; The signal processing unit 500 is further configured to, when adopting the first contact mode, preset an initial density of the microneedle electrode to be , and a density threshold to be ; when < , the signal processing unit 500 increases the density of the microneedle electrode to be ; when = , the signal processing unit 500 keeps the density of the microneedle electrode unchanged; when > , the signal processing unit 500 reduces the density of the microneedle electrode to be ; The signal processing unit 500 is further configured to, when adopting the second contact mode, preset an initial softness of the microneedle electrode to be , and a softness threshold to be ; when < , the signal processing unit 500 increases the softness of the microneedle electrode to be ; when = , the signal processing unit 500 keeps the softness of the microneedle electrode unchanged; when > When this occurs, the signal processing unit 500 reduces the softness of the microneedle electrode to... .

[0028] Specifically, the The density data at which the microneedle electrode achieves the best signal acquisition effect is determined by simulating different scalp surface conditions. The Determined based on electrode material properties and scalp adaptability testing.

[0029] Specifically, the signal processing unit 500 adjusts the density and flexibility of the microneedle electrodes using the following methods: Regarding density adjustment, the microneedle electrodes are designed as retractable structures. The signal processing unit 500 controls the extension and retraction of the microneedle electrodes to change the number of extended electrodes. When density needs to be increased, more microneedle electrodes are extended; when density needs to be reduced, some microneedle electrodes are retracted. Simultaneously, the microneedle electrode array adopts a modular layout. The signal processing unit 500 can activate or deactivate modules in specific areas as needed, further flexibly adjusting the effective electrode density. Regarding flexibility adjustment, the microneedle electrodes are made of smart materials with shape memory properties. The signal processing unit 500 applies specific current or temperature stimulation to change the molecular structure arrangement of the material, thereby achieving reversible adjustment of the microneedle electrode's hardness. When flexibility needs to be increased, the material's stiffness is reduced; when flexibility needs to be reduced, the material's stiffness is increased. Furthermore, the microneedle electrodes integrate an adjustable support structure. The signal processing unit 500 controls the degree of extension and retraction of the support structure to change the overall flexibility of the microneedle electrodes. The more the support structure extends, the harder the microneedle electrode becomes, and vice versa.

[0030] Understandably, by setting thresholds for hair coverage and sebum secretion levels, and adjusting the electrode layer contact methods for different situations, the system can better adapt to various user scalp environments. Adjusting the density and softness of the microneedle electrodes according to the scalp condition ensures stable contact between the electrodes and the scalp, improving the accuracy of EEG signal acquisition. For example, in conditions with abundant hair and sebum, adjusting electrode parameters can guarantee signal acquisition effectiveness, providing effective support for subsequent accurate analysis of EEG data and enhancing the device's practicality and applicability.

[0031] In some embodiments of this application, when the signal processing unit 500 adjusts the density of the microneedle electrodes, the preset adjustment time is... Adjust the time threshold to The shape parameters of the microneedle electrode are as follows: The shape parameter threshold is ; when < If this occurs, the signal processing unit 500 continues to adjust the density of the microneedle electrodes according to the current adjustment strategy; when = When this occurs, the signal processing unit 500 pauses adjusting the density of the microneedle electrodes; when > When this happens, the signal processing unit 500 adjusts the shape of the microneedle electrode. < Then the microneedle electrode is adjusted to a frustum shape, if = Then the microneedle electrode is adjusted to a cylindrical shape. > Then the microneedle electrode is adjusted to a cone shape; When the signal processing unit 500 adjusts the softness of the microneedle electrode, the preset change speed is... Change the speed threshold to The duration of the change is The duration threshold is ; when < At that time, the signal processing unit 500 accelerates the rate of change in softness to ; when = At that time, the signal processing unit 500 maintains the current rate of change of softness; when > When this happens, the signal processing unit 500 controls the duration of the change. < Then preset < ,like = Then preset = ,like > Then preset > .

[0032] Specifically, the The time required for the electrode layer 100 to reach a stable density under different adjustment speeds was determined by testing, combined with the time requirements of the actual detection scenario. The performance of different shaped protrusion structures in penetrating hair and conforming to the scalp was determined based on performance tests. The The maximum change speed that does not cause discomfort is determined by experiments based on the physical properties of the electrode material and the adaptability to the scalp; the The average time required to reach a steady state based on adjusting the softness.

[0033] It can be understood that the operations of adjusting the microneedle electrode density and softness of the electrode layer 100 are respectively preset with key parameters such as adjustment time, speed, duration, and corresponding thresholds. Based on these parameters, the device can accurately control the adjustment process to ensure that the microneedle electrode can reach the best working state in different scalp environments. For example, when adjusting the density, the electrode shape is changed according to the time threshold to make the electrode more suitable for the scalp; when adjusting the softness, the adjustment is optimized according to the speed and duration thresholds to ensure detection effect while improving wearing comfort, thereby enhancing the overall performance of the device.

[0034] In some embodiments of the present application, when the signal processing unit 500 adjusts the support strength and support position of the base layer 400 according to the weight and center of gravity offset of the electrode layer 100, it includes: The weight of the electrode layer 100 is preset as , the center of gravity offset is , the weight threshold is , the offset threshold is , the support strength of the base layer 400 is , the support strength threshold is , The adjustment coefficient of (initial value is 1), the offset of the support position is (initial value is 0); When < and < , the signal processing unit 500 keeps the current support strength (i.e. =1) and support position (i.e. =0); When = and = , the signal processing unit 500 fine-tunes the support strength and support position, and the fine-tuning rule is: Support strength fine-tuning: , where is the weight at the last time, is the center of gravity offset at the last time, and are fine-tuning coefficients less than 0.1; Support position fine-tuning: , where is the support position offset of the previous time, and are fine tuning coefficients, both less than 0.1.

[0035] When > and > , the signal processing unit 500 enhances the support strength and adjusts the support position, and the preset enhanced support strength is ; If < , the signal processing unit 500 adopts a mild local enhancement mode, that is, , wherein and are mild enhancement coefficients between 0.1 and 0.3. If = , the signal processing unit 500 adopts a moderate overall enhancement mode, that is, , wherein and are moderate enhancement coefficients between 0.3 and 0.6. If > , the signal processing unit 500 adopts a severe overall enhancement mode, that is, , wherein and are severe enhancement coefficients between 0.6 and 1.0. The support position adjustment is , wherein and are coefficients determined according to different enhancement modes.

[0036] Specifically, the is determined based on the bearing capacity of the substrate layer 400 and the comfort of the human body wearing, and by simulating the influence of the electrode layer 100 on the substrate layer 400; the is the maximum center of gravity offset that does not affect the normal operation of the device, which is determined based on the influence analysis on the stability of the device and by experiment; and the is determined based on the weight and center of gravity offset of the electrode layer 100, and the stability test of the substrate layer 400 under different support strengths.

[0037] Specifically, the base layer 400 adopts a flexible material with adjustable rigidity (such as an elastic structure driven by inflation or piezoelectricity), the signal processing unit 500 presets weight threshold and offset threshold, when both the weight and the center of gravity offset are below the threshold, the initial support strength and position of the base layer are maintained; when both reach the threshold, the weight change and the center of gravity offset data are monitored in real time through the built-in sensor, and the support strength (by changing the internal air pressure of the material or the piezoelectric driving parameters) and the support position (by the micro displacement mechanism under the base layer) are adjusted in a small amount based on the preset fine-tuning coefficient (less than 0.1); when both exceed the threshold, the rigidity of the base layer material is adjusted (such as increasing the inflation amount or increasing the piezoelectric driving power) according to the extent of the weight exceeding, and the fulcrum of the support position is dynamically moved according to the corresponding coefficient of different enhancement modes by using the servo motor or the shape memory alloy element at the edge of the base layer to balance the weight distribution of the electrode layer.

[0038] It can be understood that the device can intelligently adjust the support strength and the support position according to the actual conditions of the weight of the electrode layer 100, the center of gravity offset, and the support strength of the base layer 4004. When the weight and the center of gravity offset of the electrode layer 100 are small, the current state is maintained; when they are in a moderate range, they are fine-tuned; and when they exceed the range, the support is enhanced and the position is adjusted. This not only guarantees the stability of the device in different use scenarios, avoids shaking and displacement of the device caused by changes in weight and center of gravity, but also improves the comfort of wearing, ensures that the device is firmly attached to the scalp, continuously and stably collects brain electrical signals, and improves the reliability of detection.

[0039] In some embodiments of the present application, when the signal processing unit 500 adjusts the signal receiving sensitivity and the signal receiving bandwidth according to the signal strength and the signal fluctuation frequency collected by the microneedle electrode, it includes: The signal processing unit 500 receives the signal of the electrode layer 100, and presets the signal strength as , the signal fluctuation frequency as , the signal strength threshold as , the signal fluctuation frequency threshold as , the signal receiving sensitivity as , the signal receiving sensitivity threshold as , the signal receiving sensitivity adjustment coefficient as (initial value 1), and the signal receiving bandwidth adjustment coefficient as (initial value 1). When < and < , the signal receiving unit reduces the receiving sensitivity and narrows the receiving bandwidth, and the reduction rule is , , wherein and are reduction factors between 0.1 and 0.3; When = and = , the signal receiving unit maintains the current receiving sensitivity (i.e. = 1) and receiving bandwidth (i.e. = 1); When > and > , the signal receiving unit increases the receiving sensitivity and adjusts the receiving bandwidth, and the preset increased receiving sensitivity is .

[0040] If < , the signal receiving unit adopts a mild increase mode, i.e. , wherein and are mild increase factors between 0.1 and 0.3; If = , the signal receiving unit adopts a moderate increase mode, i.e. , wherein and are moderate increase factors between 0.3 and 0.6; If > , the signal receiving unit adopts a severe increase mode, i.e. , wherein and are severe increase factors between 0.6 and 1.0.

[0041] Specifically, the is the minimum signal intensity that can be effectively identified and processed based on experimental data; the is determined according to the fluctuation frequency range of normal brain wave signals and the characteristics of interference signals; and the is determined based on the receiving ability and processing requirements of the device for signals of different intensities.

[0042] It can be understood that by comparing the signal strength, the fluctuation frequency and the corresponding threshold, the signal processing unit 500 can intelligently adjust the receiving sensitivity and the receiving bandwidth. When the signal is weak, the sensitivity is improved and the bandwidth is widened to enhance the weak signal capture ability; when the signal is strong, the sensitivity is reduced and the bandwidth is reduced to avoid signal overload distortion. This effectively optimizes the electroencephalogram signal receiving effect, reduces the influence of interference signals, ensures that the device can accurately collect and process electroencephalogram signals, improves the accuracy and reliability of the electroencephalogram measurement, and ensures the stable operation of the device in different electroencephalogram signal environments.

[0043] In some embodiments of the present application, the signal processing unit 500 is also used to adjust the processing flow complexity of the signal according to the signal processing complexity and the external electromagnetic interference intensity, including: When the signal processing unit 500 converts and preliminarily processes the signal, the preset processing complexity is , the processing complexity threshold is , the external electromagnetic interference intensity is , the external electromagnetic interference intensity threshold is , and the processing flow adjustment coefficient is (initial value is 1); When < , the signal processing unit 500 simplifies the processing flow, and the simplification rule is , wherein is a simplification coefficient between 0.1 and 0.3; When = , the signal processing unit 500 maintains the current processing flow (i.e. =1); When > , the signal processing unit 500 adjusts the processing flow. If < , the signal processing unit 500 adopts a simple flow processing, i.e. , wherein is a simple flow coefficient between 0.1 and 0.3; if = , the signal processing unit 500 adopts a standard flow processing, i.e. ; if > , the signal processing unit 500 adopts a complex flow processing, i.e. , wherein is a complex flow coefficient between 0.6 and 1.0.

[0044] Specifically, the The processing flow is determined by analyzing the influence of different complexity processing flows on signal processing efficiency and accuracy. According to the tolerance of the device to electromagnetic interference and the anti-interference performance of the signal processing algorithm.

[0045] It can be understood that the signal processing unit 500 flexibly adjusts the processing flow according to the processing complexity and the intensity of external electromagnetic interference. When the external electromagnetic interference is weak and the processing complexity is low, the flow is simplified to improve the processing efficiency; when the interference intensity is moderate, the standard flow is maintained; when the interference is strong and the processing complexity is high, the complex flow is adopted to ensure the accuracy of signal processing. This adaptive adjustment avoids signal processing errors caused by changes in interference and complexity, ensures that the device can stably and efficiently process electroencephalogram signals in different electromagnetic environments, and thus improves the reliability and applicability of the detection device.

[0046] In some embodiments of the present application, the signal processing unit 500 is further configured to adjust the transmission speed of the signal according to the length of the transmission path of the signal, comprising: When the signal processing unit 500 plans the signal transmission path, the preset transmission path length is , the transmission path length threshold is , the transmission speed is , the transmission speed threshold is , and the transmission speed adjustment coefficient is (initial value is 1); When < , the signal processing unit 500 increases the transmission speed, and the increase rule is , wherein is an increase coefficient of 0.1-0.3; When = , the signal processing unit 500 maintains the current transmission speed (i.e. =1); When > , the signal processing unit 500 adjusts the transmission speed. If < , the signal processing unit 500 adopts a low-speed transmission method, i.e. , wherein is a low-speed adjustment coefficient of 0.1-0.3; if = , the signal processing unit 500 adopts a standard speed transmission (i.e. =1); if > , the signal processing unit 500 adopts a high-speed transmission method, i.e. , wherein a high speed adjustment coefficient of 0.6-1.0.

[0047] Specifically, the signal processing unit 500 is configured to determined according to the layout of the device and the signal transmission attenuation characteristics; the signal processing unit 500 is configured to determined based on the real-time requirements of signal processing and transmission.

[0048] It can be understood that the signal processing unit 500 can optimize the signal transmission according to the actual situation of the transmission path length and the transmission speed. When the transmission path length is less than the threshold value, the transmission speed is increased to speed up the signal transmission efficiency; when the length is equal to the threshold value, the speed is kept stable; when the length is greater than the threshold value, a suitable transmission speed is selected according to the specific situation, such as low speed, standard speed or high speed transmission. This ensures that the signal can be transmitted efficiently and stably in the device, avoids problems such as signal delay and loss caused by transmission path differences, and improves the overall detection real-time and accuracy of the device, so that the electroencephalogram signal can be processed and analyzed in time and accurately.

[0049] It can be understood by those skilled in the art that the above description is only the preferred embodiments of the present application and is not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A highly stretchable thin film type portable detection device for measuring human brain waves, characterized by, The device comprises: a substrate layer, which is a flexible PDMS film; a conductive layer, which is arranged on the top surface of the substrate layer and is used to provide a conductive connection; an adhesive layer, which is arranged on the top surface of the conductive layer and is used to fix the conductive layer to the electrode layer; an electrode layer, which is arranged on the top surface of the adhesive layer and comprises a plurality of microneedle electrodes, and a signal processing unit is arranged inside the electrode layer; the signal processing unit is used to adjust the contact mode of the microneedle electrodes with the scalp to be a first contact mode or a second contact mode according to the hair coverage and the oil secretion; the signal processing unit is also used to adjust the support strength and position of the substrate layer according to the weight and center of gravity offset of the electrode layer; the signal processing unit is also used to adjust the signal receiving sensitivity and bandwidth according to the signal strength and signal fluctuation frequency collected by the microneedle electrodes; the signal processing unit is also used to adjust the signal processing flow complexity according to the signal processing complexity and the external electromagnetic interference strength; the signal processing unit is also used to adjust the signal transmission speed according to the signal transmission path length.

2. The high-stretchability thin film portable detection device for measuring human brain waves according to claim 1, wherein: the conductive layer is made by printing conductive silver paste onto the substrate layer through a direct writing printing process; one end of the microneedle electrode is provided with a small needle structure, and the other end of the microneedle electrode is fixed to the top surface of the conductive layer through the adhesive layer; the top surface of the substrate layer is provided with a plurality of electrode sites.

3. The highly stretchable thin film based portable detection device for measuring human brain waves according to claim 2, wherein, When the signal processing unit adjusts the contact mode of the microneedle electrodes with the scalp to be a first contact mode or a second contact mode according to the hair coverage and the oil secretion, it includes: The preset hair coverage degree is , the hair coverage threshold is , the sebum secretion degree is , and the sebum secretion threshold is ; When > and > the electrode layer adopts the first contact mode; When and then the electrode layer employs the second contact mode; The signal processing unit is further configured to preset an initial density of the microneedle electrodes as , and a density threshold value as when the first contact mode is adopted. When , the signal processing unit increases the density of the microneedle electrodes to ; When = is true, then the signal processing unit maintains the density of the microneedle electrodes unchanged; When > the signal processing unit reduces the density of the microneedle electrodes to ; The signal processing unit is further configured to preset an initial softness of the microneedle electrode as , and a softness threshold value as when the second contact mode is adopted. When , , the signal processing unit increases the softness of the microneedle electrode to ; When = is true, then the signal processing unit maintains the softness of the microneedle electrode unchanged; When > then the signal processing unit reduces the softness of the microneedle electrode to .

4. The high-stretchability thin film portable detection device for measuring human brain waves according to claim 3, wherein: The signal processing unit adjusts the density of the microneedle electrode, the preset adjustment time is , the adjustment time threshold is , the shape parameter of the microneedle electrode is , and the shape parameter threshold is ; When the signal processing unit continues to adjust the density of the microneedle electrodes according to the current adjustment strategy;​ When = the signal processing unit suspends adjusting the density of the microneedle electrodes; When < / , the signal processing unit adjusts the shape of the microneedle electrode, if < / , the microneedle electrode is adjusted to be a circular truncated cone, if < / , the microneedle electrode is adjusted to be a cylinder, if < / , the microneedle electrode is adjusted to be a cone. The preset change speed is , the change speed threshold is , the change duration is , and the duration threshold is . When the signal processing unit accelerates the speed of changing the softness to ;​ When = 0, then the signal processing unit maintains the current rate of change of softness; = 0, then the signal processing unit maintains the current rate of change of softness; When , the signal processing unit controls the duration of the change, if , the preset , if = 0 , the preset = 1 , if , the preset .​​​​​ 5. The highly stretchable thin film based portable detection device for measuring human brain waves according to claim 4, wherein, When the signal processing unit adjusts the support strength and position of the substrate layer according to the weight and center of gravity offset of the electrode layer, it includes: The weight of the electrode layer is preset as , the gravity center offset is , the weight threshold is , the offset threshold is , the support strength of the substrate layer is , the support strength threshold is , , the adjustment coefficient of the support position is , and the initial value of is 1, the offset of the support position is , and the initial value of is 0. When and the signal processing unit keeps the current support strength and the current support position unchanged.​​ When = and = the signal processing unit fine-tunes the support strength and the support position according to the following rules: Support strength fine tuning: , wherein is the weight of the previous time, is the center of gravity offset of the previous time, and are fine tuning coefficients less than 0.

1. Support position fine adjustment: , wherein is the support position offset of the previous time, and are fine adjustment coefficients less than 0.

1.

6. The high-stretchability thin film portable detection device for measuring human brain waves according to claim 5, wherein: When > and > the signal processing unit enhances the support strength and adjusts the support position, and the preset enhanced support strength is ; If then the signal processing unit employs a light local enhancement, i.e. wherein and are light enhancement factors between 0.1 and 0.3.​ like = The signal processing unit then adopts a moderate overall enhancement method, namely ,in and All are moderate enhancement coefficients between 0.3 and 0.6; If < / s , the signal processing unit adopts a heavy overall enhancement mode, i.e. , wherein and are heavy enhancement coefficients between 0.6 and 1.

0. The support position is adjusted as wherein and are coefficients determined according to different enhancement modes.

7. The highly stretchable thin film-based portable detection device for measuring human brain waves according to claim 6, wherein When the signal processing unit adjusts the signal receiving sensitivity and bandwidth according to the signal strength and signal fluctuation frequency collected by the microneedle electrodes, it includes: The signal processing unit receives the signal of the electrode layer, the preset signal intensity is , the signal fluctuation frequency is , the signal intensity threshold is , the signal fluctuation frequency threshold is , the signal receiving sensitivity is , the signal receiving sensitivity threshold is , the signal receiving sensitivity adjustment coefficient is , and the initial value of is 1; the signal receiving bandwidth adjustment coefficient is , and the initial value of is 1. When , , , , the signal receiving unit reduces the receiving sensitivity and narrows the receiving bandwidth, wherein the reduction rule is , , wherein and are reduction coefficients between 0.1 and 0.

3. When = and = the signal receiving unit keeps the current signal receiving sensitivity and the current signal receiving bandwidth unchanged. When > And > If so, the signal receiving unit increases the receiving sensitivity and adjusts the receiving bandwidth, and the preset increased receiving sensitivity is .

8. The high-stretchability thin film portable detection device for measuring human brain waves according to claim 7, wherein: If , the signal receiving unit adopts a slight increase mode, that is , , wherein and are slight increase coefficients between 0.1 and 0.3.​ If = , the signal receiving unit adopts a moderate increase mode, that is , , wherein and are both moderate increase coefficients between 0.3 and 0.

6. If > , the signal receiving unit adopts a heavy degree of improvement, that is , , wherein and are both heavy degree of improvement coefficients between 0.6 and 1.

0.

9. The highly stretchable thin film-based portable detection device for measuring human brain waves according to claim 8, wherein, When the signal processing unit adjusts the signal processing flow complexity according to the signal processing complexity and the external electromagnetic interference strength, it includes: The signal processing unit converts and preliminarily processes signals, preset processing complexity is , processing complexity threshold is , external electromagnetic interference intensity is , external electromagnetic interference intensity threshold is , processing flow adjustment coefficient is , and the initial value of is 1. When , then the signal processing unit simplifies the processing flow, the simplification rule being , wherein is a simplification factor between 0.1 and 0.

3. when = When this happens, the signal processing unit maintains the current processing flow; When > , the signal processing unit adjusts the processing flow, if , the signal processing unit adopts a simple flow processing, i.e. , wherein is a simple flow coefficient between 0.1 and 0.3; if = , the signal processing unit adopts a standard flow processing, i.e. ; if > , the signal processing unit adopts a complex flow processing, i.e. , wherein is a complex flow coefficient between 0.6 and 1.0.​ 10. The highly stretchable thin film-based portable detection device for measuring human brain waves according to claim 9, wherein, When the signal processing unit adjusts the signal transmission speed according to the signal transmission path length, it includes: When the signal processing unit plans the signal transmission path, the preset transmission path length is... The transmission path length threshold is The transmission speed is The transmission speed threshold is The transmission speed adjustment factor is ,and The initial value is 1; When , , the signal processing unit increases the transmission speed, the increase rule is , wherein is an increase coefficient of 0.1-0.

3. when = When this happens, the signal processing unit maintains the current transmission speed unchanged; When > , the signal processing unit adjusts the transmission speed, if < , the signal processing unit adopts a low-speed transmission method, i.e. , wherein is a low-speed adjustment coefficient of 0.1-0.3; if = , the signal processing unit adopts a transmission speed of =1 for signal transmission; if > , the signal processing unit adopts a high-speed transmission method, i.e. , wherein is a high-speed adjustment coefficient of 0.6-1.0.

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