CN117731293A - EEG signal acquisition brain cap - Google Patents
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- CN117731293A CN117731293A CN202410142590.5A CN202410142590A CN117731293A CN 117731293 A CN117731293 A CN 117731293A CN 202410142590 A CN202410142590 A CN 202410142590A CN 117731293 A CN117731293 A CN 117731293A
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Abstract
The invention belongs to the technical field of electroencephalogram information acquisition, and particularly discloses an EEG signal acquisition brain cap, which comprises a brain cap; the brain cap is of a semicircular structure, through holes are uniformly distributed on the surface of the brain cap, spring pump electrodes are arranged in the through holes, nuts are connected with the outer sides of the spring pump electrodes in a threaded mode, and the nuts are connected with brain cap buckles; the spring-loaded pump electrode includes a housing; the novel electric energy storage device is characterized in that a threaded hole is formed in the center of the top surface of the shell, a groove cover is arranged in the threaded hole, the groove cover is in threaded connection with the threads of the shell, a cavity is arranged in the shell, a storage groove is formed in the cavity, the top end of the storage groove is in sealing connection with the groove cover, a first spring is sleeved on the surface of the storage groove, the bottom end of the first spring is fixedly connected with a sliding block, the sliding block is positioned in the shell, an electrode is arranged at the bottom end of the sliding block, and the sliding block is in threaded connection with the electrode; the invention has the advantages of convenient and comfortable wearing when the brain cap is designed in a lightweight way.
Description
Technical Field
The invention relates to the technical field of electroencephalogram information acquisition, in particular to an EEG signal acquisition brain cap.
Background
Electroencephalogram (EEG) is a cluster signal that is transmitted to the body surface after the electrical activity generated by neurons in the brain, and can be acquired at the forehead, the circumference of the ear, the scalp, and the like. The brain nerve electrophysiological signals can be acquired in a non-invasive way, and are widely applied to the prevention, diagnosis and follow-up of brain diseases such as epilepsy, tumors and the like, and mental diseases such as depression, mania, schizophrenia, sleep disorder and the like in clinic. Meanwhile, EEG is widely used in non-invasive brain-computer interface devices to help paralyzed, occluded and disabled people control cursors and motion aids, etc., to overcome physical barriers, thereby improving convenience of life.
The EEG collecting electrodes are directly placed on the skin surface of a human body, and when nerve electric signals from the brain propagate to different parts of the skin, potential differences are formed, so that the nerve electric signals can be picked up by electrode pairs at corresponding positions. The essence of EEG electrodes is the transducer that converts the ionic current propagating from the body electrolyte environment to the body surface into an electronic current that can be input to an external signal processing system. Electrode-skin interface contact impedance is a key indicator of EEG electrodes, lower interface impedance means that EEG signals can be coupled more into the back-end electronics, with higher signal-to-noise ratio, more sensitive signal resolution, and less signal drift.
The forehead lobe of the brain is the brain area corresponding to the forehead and the head top front area, and is widely connected with other parts of the whole brain in a two-way. Therefore, the forehead lobe mainly receives and synthesizes various information transmitted from other parts of the whole brain, and can timely send out regulation and control instructions (usually mainly inhibiting other brain region activities). Therefore, the effect of forehead leaves on the whole brain is a true "center" of the brain, and is responsible for complex and advanced cognitive activities such as memory, judgment, analysis, thinking, operation, decision-making, and the like, which is also called as "brain total command".
The utility model discloses an EEG signal acquisition facility among the prior art, application number is CN202020633285.3, and it is through the cooperation of the cap body, threaded rod, mount pad and electrode slice, conveniently adjusts the position of electrode slice, guarantees that the electrode slice is laminated with the head completely, guarantees data measurement's accuracy.
The existing brain cap has the following problems: 1. because most of the brain caps are bandage type brain caps at present, the wearing is inconvenient, the wearing is uncomfortable, the brain caps are easy to shrink, and the electrode is unstable to fix; 2. the existing brain caps integrate a hard frame, a PCB circuit board, complex circuits and a battery with larger weight, so that the brain caps become heavy and uncomfortable to wear; 3. at present, the brain cap has the problems that the circuit between the electrode and the hardware end is complex and difficult to arrange; 4. on the basis of the acquisition of the forehead lobe electroencephalogram signals by the existing brain cap, the wet electrode has the problems of complex operation, poor quality of long-time acquisition signals, small contact area and high impedance; 5. the existing wet electrode brain cap needs to be injected with conductive paste in advance to wet the stratum corneum before use, and has the disadvantages of complex operation, time consumption and poor use effect; 6. the existing dry electrode brain cap has small contact area between the electrode and the skin, and relatively large contact impedance with the skin of a human body, so that EEG signal distortion and low conductivity are caused; 7. after the existing wet electrode brain cap data acquisition is completed, electrode cleaning is complicated.
Disclosure of Invention
The present invention aims to provide an EEG signal acquisition brain cap to solve the problems set forth in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: an EEG signal acquisition brain cap comprises a brain cap shell; the brain cap shell is of a semicircular structure, through holes are uniformly distributed on the surface of the brain cap shell, spring pump electrodes are arranged in the through holes, nuts are connected to the outer sides of the spring pump electrodes in a threaded mode, and the nuts are connected with the brain cap shell in a buckling mode;
the spring-loaded pump electrode includes a housing; the utility model discloses a shell, including shell top surface, casing top surface center, threaded hole inside is provided with the capping, and capping adopts threaded connection with the shell screw thread, the inside cavity that is provided with of shell, the cavity inside is provided with the bin, bin top and capping sealing connection, the bin surface cover is equipped with first spring, first spring bottom and slider fixed connection, and the slider is located inside the shell, the slider bottom is provided with the electrode, and slider and electrode threaded connection.
Preferably, two cavities are distributed in the storage tank along the vertical direction, the two cavities are communicated through a feed channel, an opening is formed in the center of the bottom of the storage tank, the opening is communicated with the inside of the cavity below, a collar is arranged on the inner wall of the opening, a sleeve is arranged in the collar, the top end of the sleeve is in sliding connection with the inner wall of the collar, and the sliding block is sleeved on the outer side of the bottom end of the sleeve.
Preferably, a valve ball is arranged in a cavity positioned below the inside of the storage tank, a second spring is fixed on the bottom surface of the valve ball, the top end of the sleeve pipe stretches into the inside of the storage tank and is fixedly connected with a conducting pipe, the bottom end of the second spring is fixed on the top surface of the conducting pipe, and a piston is arranged in the storage tank corresponding to the position of the clamping ring.
Preferably, the forehead lobe part of the brain cap shell is provided with a plurality of flexible electrodes, the quantity of the flexible electrodes is preferably 3, the surface of the flexible electrodes is connected with a button body, the forehead lobe part of the brain cap shell is provided with a button head, the flexible electrodes are connected with the brain cap shell through buttons, a control box is fixed in the middle of the brain cap shell, a battery and an FPCB board are arranged in the control box, the surface of the control box is connected with a wire, and the other end of the wire is connected with a nut.
Preferably, the flexible electrode uses polyurethane as solute, N, N-dimethylformamide as solvent to prepare electrospun polyurethane solution, the nanofiber film is prepared by using an electrostatic spinning process, and conductive metal is plated by matching with an electron beam evaporation technology, so that the flexible electrode with shape retention, water resistance, ventilation and self-adhesion is prepared.
Preferably, the brain cap shell is manufactured by manufacturing and printing a cavity mold through an additive, and is manufactured through four manufacturing stages of filling, pressure maintaining, cooling and demolding by utilizing a flexible material and combining an injection molding process.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the condition that the lead wire is complicated and has large dead weight in the existing brain cap, the brain cap is fully plated with metal through the electrode, the sliding block, the first spring, the shell and the nut, and the lead wire is buried in the brain cap by an injection molding process, so that the transmission of electric signals is realized, and the brain cap has the advantages of comfort and attractive wearing.
2. Compared with the existing wet electrode brain cap, the wet electrode has the advantages of time and labor waste, inconvenient use, convenient use, larger impedance and poor signal quality of a dry electrode, and the invention provides the spring pump electrode.
3. Compared with the existing wet electrode which is complicated and time-consuming to clean after being coated with the conductive paste, the brain cap and the electrode are connected with the shell by adopting the thread structure, and the wet electrode can be detached and cleaned in batches after being used, so that the wet electrode is simple and convenient.
4. Compared with the existing brain cap integrated hard PCB circuit board, brain cap frame and battery with larger mass, the brain cap is heavy and uncomfortable, the brain cap is designed in a lightweight way by adopting the PDMS/PLA and other flexible brain cap frames, and the brain cap is designed in a lightweight way by adopting the small-size battery and FPCB structure, so that the volume and tumor of the control box are reduced, the brain cap is designed in a lightweight way, and the brain cap has the advantage of being comfortable to wear.
5. Compared with the condition that the existing dry electrode brain cap is incomplete and not excellent in electroencephalogram signal acquisition of forehead leaves, the invention utilizes the PU material, adopts the electrostatic spinning technology to prepare the flexible electrode and integrates the flexible electrode into the brain cap, and the flexible electrode design which is large in area, can be attached, shape-preserving and biocompatible can improve the acquisition of the forehead leaf electrical signals and improve the accuracy of electroencephalogram signal analysis.
Drawings
FIG. 1 is a cross-sectional view of an EEG signal acquisition brain cap according to the present invention;
FIG. 2 is a cross-sectional view of an EEG signal acquisition brain cap spring pump electrode provided by the invention;
FIG. 3 is a front view of an EEG signal acquisition brain cap according to the present invention;
fig. 4 is a top view of an EEG signal acquisition brain cap according to the invention.
In the figure: 1. a slot cover; 2. a housing; 3. a storage tank; 4. a first spring; 5. a valve ball; 6. a second spring; 7. a conduit; 8. a collar; 9. a piston; 10. a sleeve; 11. a slide block; 12. an electrode; 13. a spring-loaded pump electrode; 14. a nut; 15. a wire; 16. a brain cap; 17. a button head; 18. a flexible electrode; 19. and a control box.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1-4; the invention provides an EEG signal acquisition brain cap, which comprises a brain cap shell 16; the brain cap shell 16 is of a semicircular structure, through holes are uniformly distributed on the surface of the brain cap shell 16, spring pressure pump electrodes 13 are arranged in the through holes, nuts 14 are connected to the outer sides of the spring pressure pump electrodes 13 in a threaded mode, and the nuts 14 are connected with the brain cap shell 16 in a buckling mode;
the brain cap shell 16 is manufactured by adding materials, a cavity mold is printed out, a wire 15 is penetrated into the cavity mold, and the manufacturing of the brain cap shell 16 is completed through four manufacturing stages of filling, pressure maintaining, cooling and demolding by combining an injection molding process by utilizing flexible materials such as PDMS/PLA and the like, wherein the wire 15 is contacted with a conductor shell 2 on a nut 14;
the spring-loaded pump electrode 13 comprises a housing 2; the novel electric energy storage device is characterized in that a threaded hole is formed in the center of the top surface of the shell 2, a groove cover 1 is arranged in the threaded hole, the groove cover 1 is in threaded connection with the shell 2, a cavity is arranged in the shell 2, a storage groove 3 is formed in the cavity, the top end of the storage groove 3 is in sealed connection with the groove cover 1, a first spring 4 is sleeved on the surface of the storage groove 3, the bottom end of the first spring 4 is fixedly connected with a sliding block 11, the sliding block 11 is positioned in the shell 2, an electrode 12 is arranged at the bottom end of the sliding block 11, and the sliding block 11 is in threaded connection with the electrode 12;
the groove cover 1 is connected with the internal thread of the shell 2 through external threads and is in contact with the storage groove 3 to realize the sealing of the storage groove 3, the bottom end of the first spring 4 is fixed on the surface of the sliding block 11, and the sliding block 11 is positioned in the shell 2, so that the sliding block 11 can move up and down, and the bottom end of the sliding block 11 is in threaded connection with the electrode 12, so that the electrode 12 can be conveniently disassembled and cleaned;
two cavities are distributed in the storage tank 3 along the vertical direction, the two cavities are communicated through a feed channel, an opening is formed in the center of the bottom end of the storage tank 3, the opening is communicated with the cavity located below, a clamping ring 8 is arranged on the inner wall of the opening, a sleeve is arranged in the clamping ring 8, the top end of the sleeve is in sliding connection with the inner wall of the clamping ring 8, and a sliding block 11 is sleeved on the outer side of the bottom end of the sleeve;
a valve ball 5 is arranged in a cavity positioned below the inside of the storage tank 3, a second spring 6 is fixed on the bottom surface of the valve ball 5, the top end of the sleeve pipe extends into the storage tank 3 to be fixedly connected with a guide pipe 7, the bottom end of the second spring 6 is fixed on the top surface of the guide pipe 7, and a piston 9 is arranged in the storage tank 3 corresponding to the position of the clamping ring 8;
the conducting pipe 7 is connected with the clamping ring 8 through a buckle, when the sliding block 11 is positioned at the lowest part of the shell 2, the second spring 6 is in a balanced state, at the moment, two cavities in the storage tank 3 are in a communicating state, and when the sliding block 11 moves upwards to a certain position, the second spring 6 is pressed to compress the valve ball 5, at the moment, the two cavities in the storage tank 3 are in a non-communicating state.
The forehead lobe part of the brain cap shell 16 is provided with a plurality of flexible electrodes 18, the number of the flexible electrodes 18 is preferably 3, the surface of the flexible electrodes 18 is connected with a button body, the forehead lobe part of the brain cap shell 16 is provided with a button head 17, the flexible electrodes 18 are connected with the brain cap shell 16 through buttons, the middle part of the brain cap shell 16 is fixedly provided with a control box 19, a battery and an FPCB board are arranged in the control box 19, the surface of the control box 19 is connected with a lead 15, and the other end of the lead 15 is connected with a nut 14;
the flexible electrode 18 takes PU polyurethane as solute, DMFN, N-dimethylformamide as solvent to prepare electrospun polyurethane solution, utilizes electrostatic spinning technology to prepare nanofiber film, and is plated with conductive metal by matching with electron beam evaporation technology, thus completing the preparation of the flexible dry electrode 12 with shape-preserving lamination, water resistance, ventilation and self-adhesion, carrying out continuous and long-time biological signal monitoring, fixing the button body, and facilitating the fixation of the flexible dry electrode 12 and the transmission of biological electric signals.
As shown in fig. 1-4, the present invention provides an EEG signal acquisition brain cap housing 16, wherein the workflow of the spring-pump electrode 13 is: when the device works, firstly, the spring pump electrode 13 is connected with the brain cap shell 16, the spring pump electrode 13 is connected with the nut 14 through the external thread of the shell 2, at the moment, the electrode 12 positioned at the bottom of the shell 2 is in contact with the brain, the spring pump electrode 13 is screwed in continuously, the electrode 12 drives the sliding block 11 to move upwards with the sleeve 10, the sleeve 10 drives the conducting pipe 7 and the clamping ring 8 to move upwards, the clamping ring 8 drives the piston 9 to move upwards, the first spring 4 and the second spring 6 start to shrink, at the moment, the valve ball 5 is subjected to upward force so as to block a feeding channel in the storage tank 3, the inner volume of a cavity positioned below the storage tank 3 is compressed, and at the moment, the piston 9 does not block a hole of the conducting pipe 7, so that conducting paste can flow through the sleeve 10 along the hole of the conducting pipe 7 to reach the columnar electrode 12 of the electrode 12, and signal acquisition is realized;
when the outer screw of the shell 2 is screwed out of the brain cap shell 16 or the position of the electrode 12 needs to be adjusted, the structure integrally moves downwards under the action of the tension of the first spring 4 and the second spring 6, the conducting pipe 7 moves downwards, the upper flat plate part drives the piston 9 to move downwards until the second spring 6 is in a balanced state, at the moment, the piston 9 blocks the hole at the conducting pipe 7, so that the volume of a cavity below the storage tank 3 is increased to form a negative pressure area, and according to the principle of air pressure flow, the conductive paste in the cavity above the storage tank 3 flows downwards to push up the valve ball 5 to reach the lower part of the storage tank 3 so as to be filled into the cavity below the storage tank 3;
when the conductive paste is exhausted, the conductive paste can be injected into the storage tank 3 by unscrewing the tank cover 1, and the flow of the conductive paste from the inside of the storage tank 3 to the electrode 12 can be realized by circularly and reciprocally moving the flow, so that the aims of reducing impedance, being convenient and quick to use, recycling and transmitting signals well are fulfilled;
the electrode 12 and the sliding block 11 are in threaded connection, so that the electrode 12 can be screwed out after data acquisition is completed, and the electrode 12 is convenient to clean, simple and convenient.
The bioelectric signal transmission process of the brain cap housing 16 is as follows:
1. the electrode 12 is in contact with brain skin, the matched conductive paste receives signals, the signals are in surface contact with the sliding block 11 through the electrode 12, the sliding block 11 is in surface contact with the first spring 4 and the shell 2, the first spring 4 is in surface contact with the shell 2, signal transmission from the electrode 12 to the external thread of the shell 2 is achieved, the shell 2 is in threaded connection with the nut 14, the nut 14 is in contact with the lead 15, the other end of the lead 15 is connected with the control box 19, and signal transmission from the electrode 12 to the FPCB hardware end in the control box 19 is achieved; similarly, the flexible electrode 18 is contacted with the brain skin, the metal plating layer and the button body on the flexible electrode 18 are sequentially passed through to the button head 17, the button head 17 is contacted with the lead 15, the other end of the lead 15 is connected with the control box 19, the FPCB for transmitting signals from the flexible electrode 18 to the control box 19 is interrupted, and the signal transmission mode can solve the defects that the lead 15 of the traditional brain cap shell 16 structure is intricate, difficult to comb, increased dead weight and unattractive;
2. the control box 19 is provided with an FPCB hardware end, the FPCB hardware end is responsible for collecting and converting electric signals by an ADS1292 collecting module and sends the electric signals to a client end/PC end of an android mobile phone for processing in a Bluetooth wireless transmission mode, wherein the ADS1292 chip is a high-integration-level and high-precision telecommunication signal digital-analog mixed processing chip integrating electromechanical driving, analog-to-digital converter ADC, connection lead disconnection detection and SPI communication interface, the ADS1292 analog-to-digital conversion chip converts the analog electric signals collected by the electrode 12 into digital signals and realizes signal amplification, the digital signals are stored in a register of the ADS1292, bluetooth transmission is facilitated, the CC2541 chip shifts out the value in the register by setting an SPI bus, reads the value of the register and sends the read value to a rear end by utilizing a Bluetooth 4.0 protocol stack, and the peripheral circuit is externally connected with an EEG high-pass, low-pass, band-pass and band-stop filter circuit formed by a resistive container part so as to realize the electric signal filtering processing.
Notably, are: the whole device controls the realization of the device through the total control button, and because the equipment matched with the control button is common equipment, the device belongs to the prior common sense technology, and the electrical connection relation and the specific circuit structure of the device are not repeated.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. An EEG signal acquisition brain cap, characterized by: comprises a brain cap shell (16); the brain cap shell (16) is of a semicircular structure, through holes are uniformly distributed in the surface of the brain cap shell (16), spring pressure pump electrodes (13) are arranged in the through holes, nuts (14) are connected to the outer sides of the spring pressure pump electrodes (13) in a threaded mode, and the nuts (14) are connected with the brain cap shell (16) in a buckling mode;
the spring-loaded pump electrode (13) comprises a housing (2); threaded hole has been seted up at shell (2) top surface center, and the inside capping (1) that is provided with of threaded hole, and capping (1) adopts threaded connection with shell (2) screw thread, shell (2) inside is provided with the cavity, be provided with holding vessel (3) in the cavity, holding vessel (3) top and capping (1) sealing connection, holding vessel (3) surface cover is equipped with first spring (4), first spring (4) bottom and slider (11) fixed connection, and slider (11) are located shell (2) inside, slider (11) bottom is provided with electrode (12), and slider (11) and electrode (12) threaded connection.
2. An EEG signal acquisition brain cap according to claim 1, wherein: the utility model discloses a casing bottom outside of holding vessel, including holding vessel (3), slider (11), collar (8), inside two cavitys that have distributed along vertical direction of holding vessel (3), through feed channel intercommunication between two cavitys, the opening has been seted up at holding vessel (3) bottom center, the opening is with the inside intercommunication of the cavity that is located the below, and the opening inner wall is provided with collar (8), the inside sleeve pipe that is provided with of collar (8), and sleeve pipe top and collar (8) inner wall sliding connection, the sleeve pipe bottom outside is located to slider (11) cover.
3. An EEG signal acquisition brain cap according to claim 1, wherein: the novel valve is characterized in that a valve ball (5) is arranged in a cavity below the inside of the storage tank (3), a second spring (6) is fixed on the bottom surface of the valve ball (5), a conducting pipe (7) is fixedly connected to the inside of the storage tank (3) in a stretching mode at the top end of the sleeve, the bottom end of the second spring (6) is fixed to the top surface of the conducting pipe (7), and a piston (9) is arranged in the storage tank (3) corresponding to the position of the clamping ring (8).
4. An EEG signal acquisition brain cap according to claim 1, wherein: the forehead lobe part of the brain cap shell (16) is provided with a plurality of flexible electrodes (18), the quantity of the flexible electrodes (18) is preferably 3, the surface of the flexible electrodes (18) is connected with a button body, the forehead lobe part of the brain cap shell (16) is provided with a button head (17), and the flexible electrodes (18) are connected with the brain cap shell (16) through buttons.
5. An EEG signal acquisition brain cap according to claim 4, wherein: the brain cap shell is characterized in that a control box (19) is fixed in the middle of the brain cap shell (16), a battery and an FPCB board are arranged in the control box (19), a wire (15) is connected to the surface of the control box (19), and the other end of the wire (15) is connected with a nut (14).
6. An EEG signal acquisition brain cap according to claim 4, wherein: the flexible electrode (18) takes polyurethane as solute, N, N-dimethylformamide as solvent to prepare electrospun polyurethane solution, the nanofiber film is prepared by utilizing an electrostatic spinning process, and conductive metal is plated by matching with an electron beam evaporation technology, so that the flexible electrode (18) with shape-preserving lamination, water resistance, ventilation and self-adhesion is prepared.
7. An EEG signal acquisition brain cap according to claim 1, wherein: the brain cap shell (16) is manufactured by manufacturing and printing a cavity mold through an additive, and is manufactured through four manufacturing stages of filling, pressure maintaining, cooling and demolding by utilizing a flexible material and an injection molding process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410142590.5A CN117731293A (en) | 2024-01-31 | 2024-01-31 | EEG signal acquisition brain cap |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410142590.5A CN117731293A (en) | 2024-01-31 | 2024-01-31 | EEG signal acquisition brain cap |
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| Publication Number | Publication Date |
|---|---|
| CN117731293A true CN117731293A (en) | 2024-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410142590.5A Pending CN117731293A (en) | 2024-01-31 | 2024-01-31 | EEG signal acquisition brain cap |
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