Cavity active electrode packaging structure and collection device

Abstract

The application relates to the technical field of bioelectric signal acquisition, and discloses a cavity type active electrode packaging structure and an acquisition device. The cavity type active electrode packaging structure comprises an electrode body, a circuit board and a front-end signal processing circuit. The circuit board is connected with the electrode body, the surface of the electrode body facing away from the circuit board is used for contacting human skin to acquire bioelectric signals, and a cavity structure is formed between the electrode body and the circuit board. The front-end signal processing circuit is integrated on the circuit board, and the front-end signal processing circuit is located in the cavity structure. The front-end signal processing circuit is used for pre-processing the acquired bioelectric signals. The application has the advantages of compact structure, strong anti-interference capability, high integration degree and adaptability to wearable scenes.

Description

Technical Field

[0001] This invention relates to the field of bioelectric signal acquisition technology, specifically to a cavity-type active electrode packaging structure and acquisition device. Background Technology

[0002] The acquisition of bioelectrical signals (such as electromyography, electroencephalography, electrocardiography, and electrooculography) is a crucial foundation for wearable health monitoring, human-computer interaction, and brain-computer interface technologies. Existing bioelectrical signal acquisition electrodes are mainly divided into two categories: passive electrodes and active electrodes. Traditional passive electrodes serve only as conductive contacts; their electrode bodies do not integrate signal processing circuitry. The electrodes are directly connected to the amplification and filtering circuitry on the system motherboard via long wires.

[0003] However, human bioelectric signals are usually weak signals at the microvolt level with high impedance. Long-distance transmission is prone to power frequency interference, electromagnetic interference and parasitic capacitance, which leads to a decrease in signal-to-noise ratio and signal distortion, seriously affecting the acquisition accuracy.

[0004] Therefore, there is an urgent need for a cavity-type active electrode packaging structure that is compact, has strong anti-interference capabilities, high integration, and is suitable for wearable scenarios, in order to shorten the transmission path of high-impedance signals, reduce noise interference, improve signal acquisition quality, and meet the application requirements of miniaturization, arraying, and modular assembly. Summary of the Invention

[0005] This invention provides a cavity-type active electrode packaging structure and acquisition device to solve the problems of long transmission paths and high noise interference for high impedance signals.

[0006] In a first aspect, the present invention provides a cavity-type active electrode packaging structure, comprising: Electrode body; A circuit board is connected to the electrode body. The surface of the electrode body facing away from the circuit board is used to contact human skin to collect bioelectric signals. A cavity structure is formed between the electrode body and the circuit board. The circuit board integrates a front-end signal processing circuit, which is located within the cavity structure. The front-end signal processing circuit is used to preprocess the acquired bioelectric signals.

[0007] Beneficial effects: By directly encapsulating the front-end signal processing circuit inside the electrode, the electrode is transformed from a traditional passive contact into an independent active electrode module. By placing the front-end signal processing circuit within the cavity, close to the skin contact surface, the high-impedance, weak signal transmission path between the electrode contact surface and the front-end circuit input is significantly shortened. This effectively avoids the noise coupling problem caused by long traces between the electrode and the motherboard in traditional solutions, improving the anti-interference capability of bioelectrical signal acquisition. Simultaneously, it achieves integrated design of the electrode, front-end circuit, and packaging structure, facilitating miniaturization and adapting to the application needs of wearable brain-computer interface products such as wristbands, patches, head-mounted devices, and eyeglass-style devices.

[0008] In one optional embodiment, the electrode body includes a conductive layer, an insulating layer, and a shielding layer, and the circuit board is stacked sequentially with the shielding layer, the insulating layer, and the conductive layer, wherein the side of the conductive layer facing away from the insulating layer is the surface. The circuit board has a first side and a second side facing each other. The first side is disposed opposite to the shielding layer, and the shielding layer and the first side form the cavity structure. The conductive layer is used to contact human skin to collect bioelectric signals. The conductive layer is electrically connected to the circuit board. The front-end signal processing circuit is located in the cavity structure and disposed on the first side.

[0009] Beneficial effects: The conductive layer, as the contact surface that comes into direct contact with human skin, is used to collect weak bioelectrical signals such as electromyography, electroencephalography, electrocardiography, and electrooculography. The conductive layer establishes a stable electrical connection with the circuit board through a conductive connection structure.

[0010] In one optional embodiment, the conductive layer includes a plurality of electrode regions, which are sequentially distributed along the length of the electrode body. An insulating strip is provided between two adjacent electrode regions, and all of the electrode regions are electrically connected to the circuit board.

[0011] Beneficial effects: The conductive layer adopts a structure combining multiple electrode areas with insulating strips for isolation, enabling multi-channel signal acquisition from a single electrode body. This avoids interference between signals from adjacent acquisition areas, ensuring the independence and accuracy of bioelectrical signal acquisition in each channel. Simultaneously, the multi-electrode areas are distributed along the length, conforming to the signal acquisition needs of different points on the human skin, improving the acquisition coverage, and adapting to multi-regional physiological signal acquisition scenarios such as electromyography and electroencephalography.

[0012] In one optional embodiment, the front-end signal processing circuit has an input terminal and an output terminal, the input terminal being electrically connected to the conductive layer, and an external connection terminal being provided on the second surface, the external connection terminal being electrically connected to the output terminal.

[0013] Beneficial effects: By setting input and output terminals in the front-end signal processing circuit, a complete path for bioelectrical signals from acquisition and preprocessing to output is achieved. Placing the external connection terminals on the second side of the circuit board avoids the circuit layout inside the cavity, simplifies the internal packaging structure, and allows the preprocessed low-impedance signal to be output through the external connection terminals. This eliminates the need for the external main control circuit to process the high-impedance original weak signal, reduces the signal processing burden on the external main control circuit, and minimizes noise interference during secondary signal transmission.

[0014] In one optional embodiment, the external connection terminals are provided in multiple ways, and the external connection terminals are configured as at least one of the following: power supply terminal, ground terminal, analog output terminal, differential output terminal, enable terminal, digital communication terminal, contact quality status output terminal, or shielding terminal.

[0015] Beneficial effects: The inclusion of multiple types of external connection terminals enables the active electrode module to possess diverse signal output and control functions, adapting to the interface requirements of different external main control circuits. Simultaneously, the contact quality status output terminal provides feedback on the contact status, facilitating wearing reminders or recalibration by external systems, thus improving the stability of equipment operation. The shielding terminal also provides a stable connection interface for the shielding layer.

[0016] In one optional embodiment, the conductive layer is configured as at least one of conductive metal, conductive silicone, conductive rubber, conductive composite material, plating material, or conductive coating material.

[0017] Beneficial effects: The conductive layer uses a variety of optional conductive materials to adapt to different bioelectricity collection scenarios and wearing requirements.

[0018] In one optional implementation, the front-end signal processing circuit includes at least one of a buffer circuit, an amplifier circuit, a filter circuit, an input protection circuit, a bias circuit, an impedance detection circuit, an analog-to-digital conversion circuit, or a digital communication circuit.

[0019] Beneficial effects: The front-end signal processing circuit integrates multiple functional circuits, which can perform integrated preprocessing of bioelectric signals within the cavity, including buffering, amplification, filtering, impedance transformation, analog-to-digital conversion, and contact impedance detection. It effectively filters out external interference noise, amplifies weak raw signals into easily processed strong signals, and realizes the conversion from high-impedance weak signals to low-impedance strong signals. At the same time, it has a contact quality detection function, which judges the contact status by detecting contact impedance, bias current, common-mode potential, or noise level, thereby improving the signal acquisition quality and providing high-quality raw data for subsequent signal processing.

[0020] In one alternative embodiment, the conductive layer is electrically connected to the circuit board via a conductive connection structure.

[0021] Beneficial effects: The diverse conductive connection structures can be adapted to different packaging processes and assembly requirements.

[0022] In one alternative embodiment, an insulating filling structure is provided within the cavity structure.

[0023] Beneficial effects: The insulating filling structure inside the cavity securely fixes the front-end signal processing circuit and circuit board within the cavity, preventing loosening or displacement of the circuit during transportation or wear. Simultaneously, it provides insulation protection for the internal circuitry, preventing short circuits between circuits or between the circuitry and the shielding layer, and isolates external moisture and dust from entering the cavity, thus improving the waterproof and dustproof performance and lifespan of the electrode module.

[0024] Secondly, the present invention also provides a data acquisition device, including a cavity-type active electrode encapsulation structure.

[0025] Beneficial effects: The array-type acquisition device, composed of multiple cavity-type active electrode encapsulation structures, enables simultaneous acquisition of multi-channel bioelectrical signals, adapting to the needs of large-area, multi-point physiological signal acquisition. Each active electrode module works independently without interference, and the array layout and number of modules can be flexibly adjusted to adapt to different wearable devices such as wristbands, patches, and headbands. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of a cavity-type active electrode packaging structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the electrode body in an embodiment of the present invention; Figure 3 This is a schematic diagram of the cavity structure in an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures: 1. Electrode body; 101. Electrode region; 102. Insulating strip; 2. Circuit board; 201. First side; 202. Second side; 203. External connection terminals; 3. Hollow structure; 4. Electronic components. Detailed Implementation

[0028] To facilitate a clear description of the technical solutions in the embodiments of the present invention, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. For example, the first threshold and the second threshold are merely used to distinguish different thresholds and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" are not necessarily different.

[0029] It should be noted that in this invention, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0030] In this invention, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between the associated objects, indicating that three relationships can exist.

[0031] The following is combined with Figures 1 to 3 The following describes embodiments of the present invention.

[0032] According to an embodiment of the present invention, a cavity-type active electrode packaging structure is provided, including an electrode body 1, a circuit board 2, and a front-end signal processing circuit. The circuit board 2 is connected to the electrode body 1, and the surface of the electrode body 1 facing away from the circuit board 2 is used to contact human skin to collect bioelectrical signals. A cavity structure 3 is formed between the electrode body 1 and the circuit board 2. The front-end signal processing circuit is integrated on the circuit board 2 and is located within the cavity structure 3. The front-end signal processing circuit is used to preprocess the acquired bioelectrical signals.

[0033] Circuit board 2 is stacked sequentially with shielding layer, insulating layer and conductive layer, with the side of conductive layer facing away from insulating layer being the surface; The circuit board 2 has a first side 201 and a second side 202 facing each other. The first side 201 is disposed opposite to the shielding layer, and a cavity structure 3 is formed between the shielding layer and the first side 201. The conductive layer is used to contact human skin to collect bioelectric signals. The conductive layer is electrically connected to the circuit board 2. The front-end signal processing circuit is located in the cavity structure 3 and is disposed on the first side 201.

[0034] It should be noted that the electrode body 1 is configured as a sandwich structure with at least three layers, consisting of an outer conductive layer, a middle insulating layer and an inner shielding layer, and the whole is an arc-shaped curved surface structure that protrudes away from the first surface 201.

[0035] The circuit board 2 is stacked in sequence with the shielding layer, the insulating layer and the conductive layer. The circuit board 2 has a first side 201 and a second side 202 facing each other. The first side 201 faces the shielding layer, and the shielding layer and the first side 201 of the circuit board 2 enclose a closed cavity structure 3.

[0036] The conductive layer, as the contact surface that comes into direct contact with human skin, is used to collect weak bioelectrical signals such as electromyography, electroencephalography, electrocardiography, and electrooculography. The conductive layer establishes a stable electrical connection with the circuit board 2 through a conductive connection structure.

[0037] The conductive connection structure can be a spring, conductive post, conductive adhesive, metal sheet, solder joint, flexible conductive structure, press-fit structure, or integrally molded conductive structure.

[0038] The front-end signal processing circuit is integrated inside the cavity structure 3 and mounted on the first side 201 of the circuit board 2. Specifically, it is set on the electronic component 4 and the electronic component 4 is electrically connected to the circuit board 2. It can preprocess the original weak bioelectric signals collected by the conductive layer at the proximal position near the skin contact surface.

[0039] In this embodiment, by directly encapsulating the front-end signal processing circuit inside the electrode, the electrode is transformed from a traditional passive contact into an independent active electrode module. By placing the front-end signal processing circuit within the cavity, close to the skin contact surface, the high-impedance, weak signal transmission path between the electrode contact surface and the front-end circuit input is significantly shortened. This effectively avoids the noise coupling problem caused by long traces between the electrode and the motherboard in traditional solutions, improving the anti-interference capability of bioelectrical signal acquisition. Simultaneously, it achieves integrated design of the electrode, front-end circuit, and packaging structure, facilitating miniaturization and adapting to the application requirements of wearable brain-computer interface products such as wristbands, patches, head-mounted devices, and eyeglass-style devices.

[0040] In one embodiment, the conductive layer includes a plurality of electrode regions 101, which are distributed sequentially along the length of the electrode body 1. An insulating strip 102 is provided between two adjacent electrode regions 101, and all the electrode regions 101 are electrically connected to the circuit board 2.

[0041] It should be noted that the conductive layer can be configured as a multi-zone structure, specifically including three electrode zones 101. The three electrode zones 101 are distributed sequentially and spaced apart along the length of the electrode body 1, corresponding to the two ends and the middle position, respectively. Adjacent electrode zones 101 are isolated by an insulating strip 102 to prevent electrical signal crosstalk between adjacent electrode zones 101. Each electrode zone 101 is independently electrically connected to the circuit board 2 through a conductive connection structure, allowing for synchronous or independent acquisition of bioelectrical signals from different regions.

[0042] In this embodiment, the conductive layer adopts a structure of multi-electrode regions 101 combined with insulating strips 102 for isolation, realizing multi-channel signal acquisition of the single electrode body 1, avoiding mutual interference between signals in adjacent acquisition areas, and ensuring the independence and accuracy of bioelectrical signal acquisition in each channel. At the same time, the multi-electrode regions 101 are distributed along the length direction, conforming to the signal acquisition needs of different points on the human skin, improving the acquisition coverage, and adapting to multi-region physiological signal acquisition scenarios such as electromyography and electroencephalography.

[0043] In one embodiment, the front-end signal processing circuit has an input terminal and an output terminal. The input terminal is electrically connected to the conductive layer, and the second surface 202 is provided with an external connection terminal 203, which is electrically connected to the output terminal.

[0044] It should be noted that the front-end signal processing circuit is equipped with an input terminal and an output terminal. The input terminal is electrically connected to the conductive layer through the circuit board 2, and directly receives the raw bioelectric signals collected by the conductive layer. The second side 202 of the circuit board 2 is equipped with an external connection terminal 203, which is electrically connected to the output terminal of the front-end signal processing circuit. The bioelectric signals processed in the cavity can be transmitted to the external connection terminal 203 through the output terminal, and then output to the external main control circuit.

[0045] In this embodiment, by setting input and output terminals in the front-end signal processing circuit, a complete path for bioelectrical signals from acquisition and preprocessing to output is achieved. The external connection terminal 203 is located on the second side 202 of the circuit board 2, avoiding the circuit layout inside the cavity, simplifying the internal packaging structure. Simultaneously, the preprocessed low-impedance signal is output through the external connection terminal 203, eliminating the need for an external main control circuit to process the high-impedance original weak signal, reducing the signal processing pressure on the external main control circuit, and minimizing noise interference during secondary signal transmission.

[0046] In one embodiment, multiple external connection terminals 203 are provided, and the external connection terminals 203 are configured as at least one of the following: power supply terminal, ground terminal, analog output terminal, differential output terminal, enable terminal, digital communication terminal, contact quality status output terminal, or shielding terminal.

[0047] It should be noted that the external connection terminals 203 provided on the second side 202 of the circuit board 2 are of multiple types and include at least one of the following: power supply terminal, ground terminal, analog output terminal, differential output terminal, enable terminal, digital communication terminal, contact quality status output terminal, and shielding terminal.

[0048] The power supply terminal supplies power to the front-end signal processing circuit, the ground terminal provides the circuit reference potential, the analog output terminal and the differential output terminal output the pre-processed analog signal, the digital communication terminal outputs the analog-to-digital converted digital signal, the contact quality status output terminal outputs the contact status signal between the electrode and the skin, and the shielding terminal is used to connect the shielding layer.

[0049] In this embodiment, the arrangement of multiple types of external connection terminals 203 enables the active electrode module to have diverse signal output and control functions, adapting to the interface requirements of different external main control circuits. Simultaneously, the contact quality status output terminal provides feedback on the contact status, facilitating wearing reminders or recalibration by external systems, thus improving the stability of the device. The shielding terminal also provides a stable connection interface for the shielding layer.

[0050] In one embodiment, the conductive layer is configured as at least one of conductive metal, conductive silicone, conductive rubber, conductive composite material, plating material, or conductive coating material.

[0051] It should be noted that the conductive layer is made of at least one of conductive metal, conductive silicone, conductive rubber, conductive composite material, plating material or conductive coating material, and can be flexibly selected according to different application scenarios.

[0052] Specifically, metallic materials offer high conductivity and stability, making them suitable for high-precision signal acquisition. Conductive silicone and conductive rubber are flexible and can conform to the curvature of human skin, improving wearing comfort. Conductive composite materials, plating materials, and coating materials balance conductivity and lightweight design, making them suitable for miniaturized and lightweight wearable devices and ensuring the stability and reliability of bioelectrical signal acquisition.

[0053] In this embodiment, the conductive layer uses a variety of optional conductive materials to adapt to different bioelectricity collection scenarios and wearing requirements.

[0054] In one embodiment, the front-end signal processing circuit includes at least one of a buffer circuit, an amplifier circuit, a filter circuit, an input protection circuit, a bias circuit, an impedance detection circuit, an analog-to-digital conversion circuit, or a digital communication circuit.

[0055] It should be noted that the front-end signal processing circuit can integrate multiple functional circuits, including at least one of the following: buffer circuit, amplification circuit, filtering circuit, input protection circuit, bias circuit, impedance detection circuit, analog-to-digital conversion circuit, or digital communication circuit.

[0056] Specifically, the buffer circuit is used to isolate high-impedance signals, the amplifier circuit amplifies weak bioelectric signals, the filter circuit filters out power frequency, electromagnetic and other interference noise, the input protection circuit prevents electrostatic or overvoltage damage to the circuit, the bias circuit provides a stable operating potential, the impedance detection circuit detects the contact impedance between the electrode and the skin, the analog-to-digital conversion circuit converts analog signals into digital signals, and the digital communication circuit realizes digital signal transmission.

[0057] In this embodiment, the front-end signal processing circuit integrates multiple functional circuits, which can perform integrated preprocessing of bioelectric signals within the cavity, including buffering, amplification, filtering, impedance transformation, analog-to-digital conversion, and contact impedance detection. This effectively filters out external interference noise, amplifies the weak original signal into a strong signal that is easy to process, and realizes the conversion from a high-impedance weak signal to a low-impedance strong signal. At the same time, it has a contact quality detection function, which judges the contact state by detecting contact impedance, bias current, common-mode potential, or noise level, thereby improving the signal acquisition quality and providing high-quality raw data for subsequent signal processing.

[0058] In one embodiment, the conductive layer is electrically connected to the circuit board 2 via a conductive connection structure.

[0059] It should be noted that the conductive layer is electrically connected to the circuit board 2 through a conductive connection structure. The conductive connection structure is selected from at least one of the following: spring, conductive post, conductive adhesive, metal sheet, solder joint, flexible conductive structure, press-fit structure or integrally formed conductive structure. The connection position is located between the inner side of the conductive layer and the corresponding contact point of the circuit board 2, so as to ensure that the bioelectrical signal collected by the conductive layer is stably transmitted to the circuit board 2 and the front-end signal processing circuit.

[0060] Specifically, the elastic conductive structure and flexible conductive structure are flexible and adaptable to vibration or deformation scenarios, ensuring contact stability. The conductive adhesive and solder joint connection process is simple and highly conductive. The press-fit and one-piece molding structure simplifies assembly steps, improves structural reliability, and reduces signal transmission loss through close-range direct connection, avoiding the introduction of additional noise at the connection point, and ensuring the high efficiency and stability of bioelectric signal transmission.

[0061] In this embodiment, the diverse conductive connection structures are designed to adapt to different packaging processes and assembly requirements.

[0062] In one embodiment, an insulating filling structure is provided inside the cavity structure 3.

[0063] It should be noted that the cavity structure 3 is filled with an insulating filling structure, which fills the gap between the front-end signal processing circuit, the circuit board 2 and the shielding layer, fixing the internal circuit inside the cavity and covering the exposed parts of the circuit to achieve insulation isolation.

[0064] Optionally, the size of the cavity-type active electrode packaging structure is controlled at around 2cm to meet the needs of miniaturized wearable devices.

[0065] In this embodiment, an insulating filling structure is provided inside the cavity to securely fix the front-end signal processing circuit and circuit board 2 within the cavity, preventing the circuit from loosening or shifting during transportation or wearing. Simultaneously, it provides insulation protection for the internal circuitry, preventing short circuits between circuits or between the circuitry and the shielding layer, and isolates external moisture and dust from entering the cavity, thus improving the waterproof and dustproof performance and lifespan of the electrode module.

[0066] In one embodiment, the shielding layer is connected to a reference ground, analog ground, or drive shield.

[0067] It should be noted that the shielding layer is made of a conductive metallic material and is connected to the reference ground, analog ground, or drive shielding terminal. Specifically, the reference ground is the human body reference potential node of the bioelectrical acquisition system, the analog ground is the ground potential node of the analog circuit on board 2, and the drive shielding terminal is the shielding drive node for the following electrode potential output by the front-end circuit. The shielding layer is stably connected to the corresponding node through wires or conductive connection structures to form a shielding loop.

[0068] In this embodiment, the shielding layer is connected to the reference ground, analog ground, or drive shielding end to form a complete electromagnetic shielding structure, effectively blocking external power frequency interference and electromagnetic interference from entering the cavity and preventing interference noise from affecting the operation of the front-end signal processing circuit. At the same time, it reduces the parasitic capacitance between the shielding layer and the internal circuit, reduces the impact of parasitic capacitance on weak bioelectrical signals, and improves the signal-to-noise ratio of signal acquisition. The connection method of the drive shielding end can eliminate the leakage current of high-impedance electrodes, further improve the input impedance, and adapt to the high-precision EEG and ECG signal acquisition requirements.

[0069] In one embodiment, the insulating layer and insulating tape 102 may be at least one of polyimide, epoxy resin, polyethylene terephthalate, insulating silicone, polytetrafluoroethylene, or insulating ink.

[0070] In one embodiment, the insulating filler structure may be at least one of epoxy potting compound, silicone potting compound, polyurethane potting compound, insulating foam, or insulating resin.

[0071] According to an embodiment of the present invention, another aspect provides a data acquisition device, including a cavity-type active electrode packaging structure.

[0072] It should be noted that multiple active electrode modules are arranged in an array, which can be arranged along the wrist and forearm circumference, or distributed along the head, chest and other collection areas. Each active electrode module independently completes the collection and front-end preprocessing of local bioelectric signals, and then transmits the processed signals to the external main control circuit of the device. It is suitable for the synchronous collection of bioelectric signals such as electromyography, electroencephalography, electrocardiography, and electrooculography.

[0073] In this embodiment, an array-type acquisition device is composed of multiple cavity-type active electrode encapsulation structures to achieve synchronous acquisition of multi-channel bioelectrical signals, adapting to the needs of large-area, multi-point physiological signal acquisition. Each active electrode module works independently without interference, and the array layout and number of modules can be flexibly adjusted to adapt to different forms of wearable devices such as wristbands, patches, and headbands.

[0074] Although the invention has been described herein in conjunction with various embodiments, those skilled in the art will understand and implement other variations of the disclosed embodiments by reviewing the accompanying drawings, the disclosure, and the appended claims in carrying out the claimed invention. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0075] Although the invention has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made therein without departing from the spirit and scope of the invention. Accordingly, this specification and drawings are merely exemplary descriptions of the invention as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if such modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include such modifications and modifications.

Claims

1. A cavity-type active electrode packaging structure, characterized in that, include: Electrode body (1); Circuit board (2) is connected to the electrode body (1). The surface of the electrode body (1) facing away from the circuit board (2) is used to contact human skin to collect bioelectric signals. A cavity structure (3) is formed between the electrode body (1) and the circuit board (2). The circuit board (2) integrates a front-end signal processing circuit, which is located inside the cavity structure (3). The front-end signal processing circuit is used to preprocess the acquired bioelectric signals.

2. The cavity-type active electrode packaging structure according to claim 1, characterized in that, The electrode body includes a conductive layer, an insulating layer and a shielding layer. The circuit board (2) is stacked sequentially with the shielding layer, the insulating layer and the conductive layer. The side of the conductive layer that faces away from the insulating layer is the surface. The circuit board (2) has a first side (201) and a second side (202) opposite to each other. The first side (201) is disposed opposite to the shielding layer, and the shielding layer and the first side (201) form the cavity structure (3). The conductive layer is used to contact human skin to collect bioelectric signals. The conductive layer is electrically connected to the circuit board (2). The front-end signal processing circuit is located in the cavity structure (3) and disposed on the first side (201).

3. The cavity-type active electrode packaging structure according to claim 2, characterized in that, The conductive layer includes multiple electrode regions (101), which are distributed sequentially along the length of the electrode body (1). An insulating strip (102) is provided between two adjacent electrode regions (101), and all of the electrode regions (101) are electrically connected to the circuit board (2).

4. The cavity-type active electrode packaging structure according to claim 2, characterized in that, The front-end signal processing circuit has an input terminal and an output terminal. The input terminal is electrically connected to the conductive layer. The second surface (202) is provided with an external connection terminal (203), which is electrically connected to the output terminal.

5. The cavity-type active electrode packaging structure according to claim 4, characterized in that, The external connection terminal (203) is provided in multiple ways, and the external connection terminal (203) is configured as at least one of the following: power supply terminal, ground terminal, analog output terminal, differential output terminal, enable terminal, digital communication terminal, contact quality status output terminal, or shielding terminal.

6. The cavity-type active electrode packaging structure according to claim 2, characterized in that, The conductive layer is configured as at least one of conductive metal, conductive silicone, conductive rubber, conductive composite material, plating material, or conductive coating material.

7. The cavity-type active electrode packaging structure according to claim 1, characterized in that, The front-end signal processing circuit includes at least one of the following: buffer circuit, amplification circuit, filtering circuit, input protection circuit, bias circuit, impedance detection circuit, analog-to-digital conversion circuit, or digital communication circuit.

8. The cavity-type active electrode packaging structure according to claim 2, characterized in that, The conductive layer is electrically connected to the circuit board (2) through a conductive connection structure.

9. The cavity-type active electrode packaging structure according to claim 1, characterized in that, An insulating filling structure is provided inside the cavity structure (3).

10. A data acquisition device, characterized in that, include: The cavity-type active electrode packaging structure according to any one of claims 1 to 9.

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