Dry electrode
By designing a dry electrode containing a conductive knitted layer and a sponge support, the problems of traditional electrodes in terms of impedance instability, poor comfort and shape adaptability are solved, and higher quality EEG signal acquisition and wear comfort are achieved.
Patent Information
- Application Number
- CN202421720923.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-19
AI Technical Summary
Traditional wet and rigid dry electrodes have problems such as unstable impedance, poor comfort, and inability to adapt to changes in the curvature of the human head during wearing, resulting in poor EEG signal acquisition effect.
A dry electrode including a conductive knitted layer, a sponge support, a fixed steel sheet and a circuit board is designed. The conductive knitted layer collects brain waves. The sponge support provides elasticity to adapt to the shape of the human head, and the fixing screws are used to enhance fixity.
By avoiding the problem of increasing impedance caused by moisture volatility, brain wave noise is reduced, wearing comfort and data acquisition accuracy are improved, and the irregular shape of the human head is adapted to.
Smart Images
Figure CN222917537U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of intelligent wearable devices, in particular to a dry electrode. Background Art
[0002] With the continuous in-depth development of medical science, neuroscience, cognitive psychology and artificial intelligence research, electroencephalogram (EEG) signals are being increasingly applied to medical detection, clinical diagnosis and the emerging brain-computer interface field. As the direct external representation of the central nervous system, EEG can reflect the activity states of different regions of the cerebral cortex, and can be used to detect the physiological and psychological states of people and the interaction modes of brain regions with different brain functions; it can provide diagnostic information for brain states such as brain fatigue, stroke and brain death; it can combine EEG interpretation technology to complete the direct communication between the brain and external devices and realize the brain-computer interface system.
[0003] At present, EEG signals are weak voltage signals. In order to obtain high-quality EEG signals, electrodes are required to have small impedance and noise, and relatively stable electrode impedance, which also requires the electrode system to have good comfort during wearing. The traditional wet electrodes are cumbersome to wear, and as the moisture in the conductive medium volatilizes, their impedance will increase, resulting in unstable electrode impedance, which is not conducive to the acquisition of EEG signals. The traditional rigid dry electrodes are convenient to wear, but they cannot adapt to the curvature change of the human head, resulting in a decrease in their effective contact area and an increase in impedance. Moreover, due to the rigidity of the electrodes, the pressure on the head becomes uneven, the comfort is poor, and wearing for a long time may even affect the movement behavior of the wearer, which is not conducive to the acquisition of EEG signals. Summary of the Utility Model
[0004] To solve the above problems, the utility model provides a dry electrode, including: a conductive knitted layer, a sponge support part, a fixing steel sheet and a circuit board;
[0005] The conductive knitted layer includes a first conductive layer and a second conductive layer, the sponge support part is clamped between the first conductive layer and the second conductive layer, and the first conductive layer and the second conductive layer are press-fitted and connected along the outer edge of the sponge support part;
[0006] The second conductive layer is attached to and connected with the fixing steel sheet;
[0007] The fixing steel sheet is connected with the circuit board.
[0008] Further, the sponge support part includes: a first sponge layer, a sponge support layer and a second sponge support layer;
[0009] The sponge support layer is sandwiched between the first sponge layer and the second sponge layer, and the first sponge layer and the second sponge layer are press-fitted and connected together along the outer edge of the sponge support layer with the first conductive layer and the second conductive layer.
[0010] Further, the top of the sponge support layer has a protrusion.
[0011] Further, the thickness of the sponge support layer is 1 - 1.5 cm.
[0012] Further, it further includes fixing screws, and the fixing screws sequentially pass through the circuit board, the fixing steel sheet, the second conductive layer, the second sponge layer and the sponge support layer.
[0013] Beneficial effects:
[0014] Compared with the prior art, the present utility model uses a conductive knitted layer to collect the brain waves of users, without using a water-containing dielectric as a conduction medium, effectively avoiding the problem of increased impedance caused by water evaporation, and the collected brain waves have less noise. At the same time, the conductive knitted layer is flexible, and when it cooperates with the sponge support part, it can make the user more comfortable when wearing. In addition, the elasticity of the sponge support part can make the present utility model adapt to the irregular shape of the human head, ensure the effective contact area between the conductive knitted layer and the skin, and make the collected data more accurate. Description of the drawings
[0015] The specification drawings described herein are used to provide a further understanding of the present utility model, and constitute a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model, and do not constitute an improper limitation to the present utility model. In the drawings:
[0016] Figure 1 It is a schematic diagram of the overall structure of the dry electrode in the embodiment of the present utility model.
[0017] 1. Conductive knitted layer; 11. First conductive layer; 12. Second conductive layer; 2. Sponge support part; 21. First sponge layer; 22. Sponge support layer; 23. Second sponge layer; 3. Fixing steel sheet; 4. Circuit board; 5. Fixing screw. Detailed implementation manners
[0018] In order to make the above-mentioned objects, features and advantages of the present utility model more obvious and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0019] As shown in Figure 1 the figure, an embodiment of the present utility model provides a dry electrode, which includes a conductive knitted layer 1, a sponge support part 2, a fixed steel sheet 3 connected in sequence, and a circuit board 4 connected to the fixed steel sheet 3. Among them, the conductive knitted layer 1 includes a first conductive layer 11 and a second conductive layer 12. The sponge support part 3 is sandwiched between the first conductive layer 11 and the second conductive layer 12. Specifically, the first conductive layer 11 covers the top and the peripheral side of the sponge support part 2 to ensure an effective skin-friendly area of the conductive knitted layer 1. The second conductive layer 12 covers the bottom surface of the sponge support part 2 and is attached to the fixed steel sheet 3 to ensure an effective contact area for electrical signal conduction. Finally, the first conductive layer 11 and the second conductive layer 12 are press-fitted and connected along the outer edge of the sponge support part 2 and form a boss structure with the fixed steel sheet 3, so that the embodiment of the present utility model can be embedded in a wearable device during installation.
[0020] Compared with the prior art, in the embodiment of the present utility model, the conductive knitted layer 1 is used to collect the brain waves of users, without using a water-containing dielectric as a conduction medium, effectively avoiding the problem of increased impedance caused by water evaporation, and the collected brain wave noise is smaller. At the same time, the conductive knitted layer 1 is flexible, and when it cooperates with the sponge support part 2, it can make the user more comfortable when wearing. In addition, the elasticity of the sponge support part 2 can make the embodiment of the present utility model adapt to the irregular shape of the human head, ensure an effective contact area between the conductive knitted layer 1 and the skin, and make the collected data more accurate.
[0021] In actual use, due to the elasticity of the sponge, when the sponge support part 2 is compressed, it is easy to move inside the conductive knitted layer 1 to form a cavity, resulting in the phenomenon that the first conductive layer 11 is wrinkled. In the long run, the conductive knitted layer 1 is prone to irreversible deformation and cannot accurately collect the brain waves of users. To avoid this phenomenon and extend the service life, as Figure 1 shown in the figure, the sponge support part 2 of the embodiment of the present utility model includes: a first sponge layer 21, a sponge support layer 22, and a second sponge support layer 23. Among them, the sponge support layer 22 is sandwiched between the first sponge layer 21 and the second sponge layer 23. The first sponge layer 21 and the second sponge layer 23 are press-fitted and connected with the first conductive layer 11 and the second conductive layer 12 along the outer edge of the sponge support layer 22 to limit the relative movement between the sponge support part 2 and the conductive knitted layer 1. At the same time, in order to better fit the user's skin, the top of the sponge support layer 22 of this embodiment has a protrusion, and the thickness is preferably 1-1.5 cm. In addition, in order to play a better fixing role, the embodiment of the present utility model further includes a fixing screw 5, and the fixing screw 5 sequentially passes through the circuit board 4, the fixed steel sheet 3, the second conductive layer 12, the second sponge layer 23, and the sponge support layer 22.
[0022] The above are only the specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claimed rights.
Claims
1. A dry electrode, characterized in that: include: Conductive knitted layer, sponge support part, fixed steel sheet and circuit board; The conductive knitted layer includes a first conductive layer and a second conductive layer, the sponge support portion is sandwiched between the first conductive layer and the second conductive layer, and the first conductive layer and the second conductive layer are pressed and connected along the outer edge of the sponge support portion; The second conductive layer is bonded and connected to the fixed steel sheet; The fixing steel sheet is connected to the circuit board.
2. The dry electrode according to claim 1, characterized in that The sponge support part comprises: a first sponge layer, a sponge support layer, and a second sponge support layer; The sponge support layer is sandwiched between the first sponge layer and the second sponge layer. The first sponge layer and the second sponge layer are pressed and connected with the first conductive layer and the second conductive layer along the outer edge of the sponge support layer.
3. The dry electrode according to claim 2, characterized in that The top of the sponge supporting layer is provided with a bulge.
4. The dry electrode according to claim 2, characterized in that The thickness of the sponge support layer is 1-1.5 cm.
5. The dry electrode according to claim 2, characterized in that: It also includes fixing screws, which pass through the circuit board, the fixing steel sheet, the second conductive layer, the second sponge layer and the sponge supporting layer in sequence.