Electroencephalogram acquisition device

Abstract

The application discloses a brain electric wave collecting device, which comprises a supporting structure, a connecting structure and an electrode unit. The supporting structure is used for forming a containing space surrounding a head, and part of the connecting structure is arranged in the containing space. The electrode unit comprises a plug-in part and an electrode part. The plug-in part is used for being plugged into the connecting structure and is limited in the connecting structure along the axial and radial directions of the plug-in part and is electrically connected with the connecting structure. When the plug-in part is plugged into the connecting structure, the electrode part is arranged on the side of the plug-in part away from the connecting structure and is electrically connected with the plug-in part. The electrode part is used for absorbing and releasing a conductive solution and is used for contacting the head. The brain electric wave collecting device can realize the reliable mechanical connection and electrical connection between the electrode unit and the connecting structure, realizes the detachable connection between the electrode unit and the connecting structure, and the conductive solution will not be stuck on the head of a user like conductive paste, so that the user experience is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electroencephalogram acquisition, in particular to an electroencephalogram acquisition device. BACKGROUND

[0002] The electroencephalogram interface system is to realize the direct control of the brain to the external device by converting the collected brain activity signals into information and instructions and outputting, which can replace, repair, enhance, supplement or improve the output of the central nervous system. A typical brain-computer interface system includes five links of electroencephalogram induction, signal acquisition, signal processing, instruction output and execution mechanism. Among them, the signal acquisition link generally uses a non-invasive electrode, which can collect electroencephalogram signals by directly placing on the scalp. At present, in the electroencephalogram acquisition device of the electroencephalogram interface system, the electrode is mostly selected as a dry electrode, which needs to be matched with a conductive paste during use. Its operation is relatively cumbersome, and the user experience is poor. In addition, the dry electrode and the brain support structure are mostly fixedly connected, so that when the electrode fails, the electrode cannot be quickly disassembled and replaced.

[0003] Therefore, how to improve the convenience of operation and maintenance of the electroencephalogram acquisition device, as well as improve the user experience, has become a difficult problem to be solved by the technical personnel in the field. SUMMARY

[0004] The present application provides an electroencephalogram acquisition device to improve the convenience of operation and maintenance of the electroencephalogram acquisition device, as well as improve the user experience.

[0005] The present application provides an electroencephalogram acquisition device, which comprises a support structure, a connecting structure and an electrode unit. The support structure is used to form an accommodation space surrounding the head, and part of the connecting structure is arranged in the accommodation space. The electrode unit comprises a plug-in part and an electrode part. The plug-in part is used to be inserted into the connecting structure, and is limited in the connecting structure along the axial and radial directions of the plug-in part, and is electrically connected with the connecting structure. When the plug-in part is inserted into the connecting structure, the electrode part is arranged on the side of the plug-in part away from the connecting structure, and is electrically connected with the plug-in part. The electrode part is used to absorb and release a conductive solution, and is used to contact the head.

[0006] The electroencephalogram acquisition device provided by the present application is used. Since the plug-in part of the electrode unit is used to be inserted into the connecting structure, and is limited in the connecting structure along the axial and radial directions of the plug-in part, the reliable mechanical connection and electrical connection between the electrode unit and the connecting structure can be realized, and at the same time, the detachable connection of the two can be realized, so that the convenience of operation and maintenance of the electroencephalogram acquisition device is effectively improved.

[0007] In addition, the electrode part absorbs and releases the conductive solution to transmit the brain electrical signals of the user's head to the electrode part through the conductive solution. Compared with the conductive paste, the conductive solution is a liquid. On the one hand, during the brain electrical signal collection process, the conductive solution can be uniformly distributed on the user's head, which can effectively reduce the contact resistance between the electrode part and the head and improve the signal transmission effect. On the other hand, after the brain electrical signal collection is completed, the conductive solution can volatilize by itself, and will not stick to the user's head like the conductive paste. Therefore, after the brain electrical signal collection is completed, the user does not need to clean the head additionally, thereby effectively improving the user experience.

[0008] In a possible implementation of the present application, the connecting structure comprises an elastic part, which is used to form a socket for inserting the plug-in part. When the plug-in part is inserted into the socket, the elastic part extrudes the plug-in part in the radial direction of the plug-in part, so as to simplify the structure while realizing the reliable connection between the plug-in part and the connecting structure.

[0009] In a possible implementation of the present application, the connecting structure further comprises a rigid structure in the form of a cylinder, which is sleeved on the outside of the elastic part in the circumferential direction of the elastic part and is connected with the elastic part to realize the electrical connection therebetween. In addition, part of the rigid structure penetrates the support structure in the axial direction of the rigid structure and is connected with the support structure through a fastener, so as to realize the reliable connection between the connecting structure and the support structure while simplifying the connecting structure.

[0010] In a possible implementation of the present application, the inner wall of the rigid structure is provided with a first groove, and the elastic part is embedded in the first groove. When the plug-in part is separated from the connecting structure, the end of the elastic part is spaced apart from the side wall of the first groove in the axial direction of the rigid structure. When the plug-in part is inserted into the connecting structure, the end of the elastic part abuts against the side wall of the first groove in the axial direction of the rigid structure, so as to meet the requirements of mechanical connection and electrical connection between the plug-in part and the connecting structure while simplifying the connecting structure.

[0011] In a possible implementation of the present application, the rigid structure comprises a first face and a limiting part, and the extension plane of the first face penetrates the axis of the rigid structure. The limiting part is arranged on the inner wall of the rigid structure in the circumferential direction of the rigid structure. The limiting part is spaced apart from the first face in the axial direction of the rigid structure. The side wall of the plug-in part is provided with an abutting part. When the plug-in part is inserted into the connecting structure, the abutting part is located on the side of the limiting part away from the first face in the axial direction of the rigid structure and abuts against the limiting part, and the part of the electrode unit away from the limiting part abuts against the first face, so as to limit the movement of the plug-in part in the axial direction.

[0012] In a possible implementation of the present application, the limiting part comprises an elastic cantilever, and the open end of the elastic cantilever extends along the circumference of the rigid structure. When the plug-in part is inserted into the connecting structure, the abutting part abuts against the open end of the elastic cantilever along the axial direction of the plug-in part, and the distance between the open end of the elastic cantilever and the first surface is m. When the plug-in part is separated from the connecting structure, the distance between the open end of the elastic cantilever and the first surface is n along the axial direction of the plug-in part, and n > m. By using the electroencephalogram acquisition device provided in the present application, the elastic cantilever is arranged to reduce the contact resistance between the plug-in part and the connecting structure, thereby further improving the stability of the electrical connection between the plug-in part and the connecting structure.

[0013] In a possible implementation of the present application, the elastic cantilever is provided with a locking structure. When the plug-in part is inserted into the connecting structure, the locking structure is located between the abutting part and the fixed end of the elastic cantilever, so that the locking structure limits the abutting part, reduces the risk of the abutting part rotating towards the fixed end of the elastic cantilever due to the force of the elastic cantilever on the abutting part, and improves the reliability of the mechanical connection between the plug-in part and the connecting structure while improving the stability of the electrical connection between the plug-in part and the connecting structure.

[0014] In a possible implementation of the present application, the open end of the elastic cantilever is provided with a pressing part along the axial direction of the plug-in part, and the pressing part extends away from the first surface. When the electrode unit is separated from the connecting structure, the pressing part can be moved away from the abutting part by applying pressure to the pressing part, so that the locking structure of the elastic cantilever is separated from the abutting part of the plug-in part. At this time, the plug-in part can be rotated to make the abutting part disengage from the limiting part of the rigid structure, and then a pulling force is applied to the plug-in part, so that the plug-in part and the connecting structure are quickly separated.

[0015] In a possible implementation of the present application, the inner wall of the rigid structure is provided with at least two limiting parts, and adjacent two limiting parts are arranged at intervals along the circumference of the rigid structure. The plug-in part is provided with at least two abutting parts, and the at least two abutting parts correspond to the at least two limiting parts one by one, so as to improve the reliability of the mechanical connection and the electrical connection between the plug-in part and the connecting structure.

[0016] In a possible implementation of the present application, the connecting structure further comprises a first insulating shell, and the first insulating shell wraps the rigid structure along the circumference of the rigid structure. A part of the first insulating shell penetrates the support structure along the axial direction of the rigid structure, and the part of the first insulating shell penetrating the support structure is connected with the support structure by the fastener, so as to realize the reliable connection between the connecting structure and the support structure and simplify the connecting structure.

[0017] In a possible implementation of the present application, the electrode unit further comprises a second insulating shell, the insertion part penetrates through the second insulating shell along the axial direction of the insertion part, and the insertion part is fixedly connected with the second insulating shell. The second insulating shell comprises a second groove for accommodating the conductive medium. The electrode part and the part of the insertion part are both located in the second groove and are fixedly and electrically connected through the conductive medium. In this way, mechanical connection and electrical connection between the insertion part and the electrode part are achieved, and the structure of the electrode unit is simplified. In addition, after the electrode unit is connected with the connecting structure, the first insulating shell and the second insulating shell form an insulating layer on the outer side wall of the insertion part and the connecting structure, so that the risk of overflow of the collected electroencephalogram signal is reduced, and the signal strength is improved.

[0018] In a possible implementation of the present application, the electrode part comprises a liquid suction part and a flexible arm, and the liquid suction part is electrically connected with the insertion part through the flexible arm. The liquid suction part is used for absorbing and releasing the conductive solution. When the electroencephalogram acquisition device is worn on the head, the liquid suction part is pressed against the head, and the flexible arm is bent at a certain angle, so that rigid contact between the electrode unit and the head of the user is avoided, and the user experience is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure;

[0020] Figure 2 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure; Figure 1 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure;

[0021] Figure 3 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure;

[0022] Figure 4 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure; Figure 1 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure;

[0023] Figure 5 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure; Figure 4 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure;

[0024] Figure 6 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure; Figure 4 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure;

[0025] Figure 7 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure; Figure 6 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure;

[0026] Figure 8 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure; Figure 1 A structural schematic diagram of an electroencephalogram acquisition device provided in the present application is shown in the figure;

[0027] Figure 9 for Figure 1 A schematic diagram of the connector of the provided EEG acquisition device;

[0028] Figure 10 for Figure 1 A schematic diagram of the connection structure of the provided EEG acquisition device;

[0029] Figure 11 for Figure 4 A cross-sectional view of the connector and connection structure of the provided EEG acquisition device in the plugged-in state;

[0030] Figure 12 for Figure 11 A magnified view of point A on the provided EEG acquisition device.

[0031] Reference numerals: 1-Support structure; 11-Outer shell; 12-Substrate; 121-Mounting hole; 2-Connecting structure; 21-Elastic part; 211-Arc arm; 22-Rigid structure; 221-Limiting part; 2211-Elastic cantilever; 22111-Locking structure; 22112-Pressing part; 222-First surface; 23-First insulating shell; 3-Electrode unit; 31-Plug-in part; 311-Abutting part; 32-Electrode part; 321-Liquid absorption part; 322-Flexible arm; 33-Second insulating shell; 331-Second groove; 332-Third groove. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms expressing position and direction described in the embodiments of this application are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this application. The accompanying drawings of the embodiments of this application are only for illustrating relative positional relationships and do not represent actual scale.

[0033] It should be noted that specific details are set forth in the following description to facilitate understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] The electroencephalogram interface system is to convert the collected brain activity signals into information and instructions and output, to realize the direct control of the brain to the external device, and can replace, repair, enhance, supplement or improve the output of the central nervous system. A typical brain-computer interface system includes five links of electroencephalogram induction, signal collection, signal processing, instruction output and actuator. Among them, the electroencephalogram induction includes steady-state visual evoked potential (SSVEP), P300, motor imagery and other methods. Because the electroencephalogram signal of a person in a calm state is relatively weak, the amplitude is several microvolts to several tens of microvolts, and the frequency is between 0.1 Hz and 50 Hz, it is difficult to identify and process such weak signals. Therefore, the method of electroencephalogram induction is generally used to induce the electroencephalogram.

[0035] The signal collection link generally uses non-invasive electrodes, which can collect the electroencephalogram by directly placing on the scalp. Common non-invasive electrodes include dry electrodes and gel electrodes.

[0036] The signal processing generally uses an electroencephalogram signal amplifier to convert the electroencephalogram data into a digital signal and then transmit it out. The instruction output generally uses the host computer software to identify the electroencephalogram data, obtains the correct rate, and then outputs the result. The actuator generally refers to a blower, a mechanical arm, a drone and the like.

[0037] In recent years, with the development of electroencephalogram interface system technology, the electroencephalogram interface system gradually moves from the laboratory to practical application. At present, in the electroencephalogram collection device of the electroencephalogram interface system, the dry electrode needs to be used with conductive paste during use, and the operation is relatively cumbersome, and the conductive paste is easy to stick on the scalp and hair, which is difficult to clean, which leads to poor user experience. In addition, the dry electrode and the brain support structure are mostly fixedly connected, so when the electrode fails, it cannot realize the quick disassembly and replacement of the electrode.

[0038] Therefore, the electroencephalogram collection device provided by the present application is provided by setting the electrode unit capable of absorbing the conductive solution, and the electrode unit is detachably connected with the support structure worn on the head, so as to improve the convenience of operation and maintenance of the electroencephalogram collection device, and improve the user experience. In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0039] It should be noted that the signal transmission mode of the electroencephalogram collection device provided by the present application can be based on signal line transmission or wireless transmission, and the transmission mode is prior art, which will not be described here. The electrical signals collected by the electroencephalogram collection device can be uploaded to the signal processing program through the electroencephalogram signal amplifier, so as to drive the movement of the actuator.

[0040] Reference Figure 1 and Figure 2 , Figure 1A structural schematic diagram for showing the outside of an electroencephalogram acquisition device, Figure 2 A structural schematic diagram for showing Figure 1 A structural schematic diagram for showing the inside of an electroencephalogram acquisition device. The electroencephalogram acquisition device comprises a support structure 1, a connecting structure 2 and an electrode unit 3, wherein the support structure 1 is used to form a containing space surrounding the head, and part of the connecting structure 2 is arranged in the containing space and part is located outside the containing space. For example, the support structure 1 can comprise a shell 11 and a substrate 12. The shape of the shell 11 can refer to the shape of the helmet as shown in Figure 3 , and the helmet can be directly worn on the head. The shape of the substrate 12 is matched with the inner side wall of the shell 11, and the material can be soft silicone or plastic. In addition, the substrate 12 and the shell 11 can be bonded by magic tape to improve the convenience of mounting and separating between the substrate 12 and the shell 11.

[0041] In the specific arrangement of the electrode unit 3, reference can be made to Figure 4 , Figure 4 A structural schematic diagram for showing Figure 1 The electrode unit 3 of the electroencephalogram acquisition device provided in a separated state with the connecting structure 2. The electrode unit 3 comprises a plug-in part 31 and an electrode part 32. The plug-in part 31 is used to be inserted into the connecting structure 2, and the plug-in part 31 is limited in the connecting structure 2 along the axial and radial directions of the plug-in part 31, so as to realize reliable connection and detachable connection of the electrode unit 3 and the connecting structure 2. And the plug-in part 31 of the electrode unit 3 is electrically connected with the connecting structure 2, so that the electroencephalogram signals collected by the electrode unit 3 are transmitted to the signal processing program through the connecting structure 2.

[0042] In the specific arrangement of the electrode part 32, when the plug-in part 31 is inserted into the connecting structure 2, the electrode part 32 is arranged on the side of the plug-in part 31 away from the connecting structure 2, and is electrically connected with the plug-in part 31. In an alternative embodiment, as shown in Figure 4 , the electrode part 32 comprises a liquid absorbing part 321 and a flexible arm 322, wherein the liquid absorbing part 321 is exemplarily a columnar sponge head for absorbing and releasing conductive solution, and the sponge head is used to contact the scalp and is electrically connected with the plug-in part 31 through the flexible arm 322.

[0043] The flexible arm 322 is exemplarily a conductive metal wire, and the conductive metal wire has a certain flexibility and rigidity. The liquid absorbing part 321 wraps one end of the conductive metal wire. When the electroencephalogram acquisition device is worn on the head, the liquid absorbing part 321 is pressed against the head, and then the flexible arm 322 is bent at a certain angle, so that rigid contact between the electrode unit 3 and the head of the user can be avoided, thereby effectively improving the user experience.

[0044] It can be understood that the liquid absorbing portion 321 has a dry state and a wet state. During the collection of the brain electrical signals, the liquid absorbing portion 321 absorbs and releases the conductive solution, i.e., is in the wet state, so that the liquid absorbing portion 321 forms an effective electrical connection through the conductive solution and the flexible arm 322 and the plug-in portion 31.

[0045] It should be noted that the conductive solution is exemplarily a salt solution, and the ratio of Nacl to water in the salt solution is 5g-12g:250ml. During the collection of the brain electrical signals, the liquid absorbing portion 321 releases the salt solution due to the mutual extrusion between the liquid absorbing portion 321 and the user's head, and the released salt solution adheres to the user's scalp to reduce the electrical resistance between the scalp and the liquid absorbing portion 321, and the liquid absorbing portion 321 forms an effective electrical connection through the salt solution and the flexible arm 322 made of metal.

[0046] It is worth mentioning that the electrode unit 3 can be provided with a plurality of electrode portions 32, one of which is located in a ring formed by the remaining plurality of electrode portions 32, i.e., the remaining plurality of electrode portions 32 are uniformly distributed along the circumference of the plug-in portion 31, and the plurality of electrode portions 32 are comb-shaped. Specifically, according to the international 10-10 lead diagram layout, a ground electrode opposite the forehead and a reference electrode opposite the top of the head are included.

[0047] In addition, since the conductive solution is a fluid, it will flow along the scalp, so the brain electrical signals of the scalp position covered by the conductive solution will be transmitted to the signal processing program through the liquid absorbing portion 321 and the flexible arm 322 to improve the brain electrical signal collection effect.

[0048] The brain electrical signal collection device provided in the present application has the plug-in portion 31 of the electrode unit 3 for plugging into the connecting structure 2, and the plug-in portion 31 is limited in the connecting structure 2 along the axial and radial directions of the plug-in portion 31, so that the mechanical connection and electrical connection between the electrode unit 3 and the connecting structure 2 are reliable, and the detachable connection of the two is realized, thereby effectively improving the convenience of operation and maintenance of the brain electrical signal collection device.

[0049] In addition, since the electrode portion 32 releases the conductive solution to transmit the brain electrical signals of the user's head to the electrode portion 32, compared with the conductive paste, the conductive solution is a liquid, which can be uniformly distributed on the user's head during the collection of the brain electrical signals, thereby effectively reducing the contact resistance between the electrode portion 32 and the head and improving the signal transmission effect. On the other hand, after the collection of the brain electrical signals is completed, the conductive solution can volatilize by itself, unlike the conductive paste which sticks to the user's head, so that the user does not need to clean the head after the collection of the brain electrical signals is completed, thereby effectively improving the user experience.

[0050] In the specific setting of the connecting structure 2, in one alternative embodiment, referring to Figure 5 , Figure 5 for showing Figure 4 a radial sectional view, the connecting structure 2 comprises an elastic part 21 for forming a socket for the plug-in part 31. In the specific setting of the elastic part 21, referring to Figure 5 and Figure 6 , Figure 6 for showing Figure 4 a axial sectional view of the connecting structure 2 of the provided electroencephalogram acquisition device. The elastic part 21 comprises a plurality of arc-shaped arms 211, and each of the arc-shaped arms 211 protrudes towards the axial direction of the socket. As shown in Figure 7 , Figure 7 for showing Figure 6 a schematic view along the Y direction, along the axial direction of the socket, the aperture of the socket formed by the elastic part 21 gradually decreases and then gradually increases, and the diameter of the position with the smallest aperture is smaller than the diameter of the plug-in part 31, so that when the plug-in part 31 is inserted into the socket, the elastic part 21 presses the plug-in part 31 along the radial direction of the plug-in part 31, so as to effectively increase the contact area between the socket and the plug-in part 31 and reduce the contact resistance therebetween while meeting the reliability of the mechanical connection therebetween. It should be noted that the shape of the plug-in part 31 is exemplarily cylindrical, and the arc-shaped arm 211 is in a flat state of a rectangular plate structure, and the same and opposite bending forces are applied to both ends of the rectangular plate structure to make it form an arc shape (bow shape), and the protruding part of the arc-shaped arm 211 relative to both ends is used to contact the plug-in part 31, so as to further increase the contact area between the socket and the plug-in part 31 and reduce the contact resistance between the plug-in part 31 and the socket.

[0051] Continuing to refer to Figure 5 and Figure 6In one specific embodiment, the connecting structure 2 comprises a rigid structure 22 of electrically conductive metal material in a cylindrical shape, which is sleeved on the outer side of the elastic part 21 along the circumference of the elastic part 21 and is connected with the elastic part 21. It can be understood that the elastic part 21 and the rigid structure 22 are electrically connected to improve the signal transmission effect. It should be noted that the application does not limit the connection mode of the rigid structure 22 and the elastic part 21. For example, the arc-shaped arm 211 of the elastic part 21 is a cantilever structure, one end of which is fixedly connected with the inner wall of the rigid structure 22 to form a fixed end, the other end is in abutment with the inner wall of the rigid structure 22 to form an open end, and along the insertion direction (positive direction of the Z axis) of the plug-in part 31, the fixed end and the open end are arranged in sequence, that is, the fixed end of the cantilever is located at the entrance position of the insertion hole of the rigid structure 22 into which the plug-in part 31 is inserted. During the process of inserting the plug-in part 31 into the insertion hole, the arc-shaped arm 211 is pressed and stretched by a certain angle in the direction away from the entrance of the insertion hole, and then the open end is in abutment with the limiting protrusion. At this time, the pressing force of the arc-shaped arm 211 on the plug-in part 31 can still meet the connection reliability between the plug-in part 31 and the connecting structure 2. And the plug-in part 31 can transmit the electroencephalogram signal to the signal processing program through the elastic part 21, the rigid structure 22, the lead wire and the electroencephalogram amplifier.

[0052] It is worth mentioning that, as shown in Figure 6 , the rigid structure 22 can be provided with a limiting part 221 arranged on the inner wall of the rigid structure 22 along the circumference of the rigid structure 22. In this way, when the plug-in part 31 is separated from the connecting structure 2, the open end of the cantilever is spaced apart from the limiting part 221, and when the plug-in part 31 is inserted into the connecting structure 2, the open end of the cantilever is in abutment with the limiting part 221 after the arc-shaped arm 211 is pressed and stretched by a certain angle in the direction away from the entrance of the insertion hole, and the protruding position of the arc-shaped arm 211 presses the plug-in part 31, so as to meet the mechanical connection and electrical connection stability between the plug-in part 31 and the elastic part 21.

[0053] It should be noted that the application does not limit the material, number and size of the arc-shaped arm 211. For example, eight arc-shaped arms 211 of beryllium copper gold plating can be uniformly arranged along the circumference of the rigid structure 22, and the width of the arc-shaped arm 211 is 0.6 mm. Figure 7 As shown in , the angle between the connecting line of the fixed end of the arc-shaped arm 211 and the protruding position of the arc-shaped arm 211 and the side wall of the rigid structure 22 is α, and for example, α = 5°, so as to meet the mechanical connection and electrical connection reliability between the elastic part 21 and the plug-in part 31.

[0054] In addition, in an optional embodiment, a first groove can be arranged on the inner wall of the rigid structure 22, and the elastic part 21 is embedded in the first groove. In the axial direction of the rigid structure 22, the width (the size in the axial direction of the jack) of the first groove is greater than the height of the elastic part 21, so that when the plug-in part 31 is separated from the connecting structure 2, that is, the plug-in part 31 is not inserted into the jack of the connecting structure 2, the end of the elastic part 21 is spaced apart from the side wall of the first groove in the axial direction of the rigid structure 22. When the plug-in part 31 is inserted into the connecting structure 2, the elastic part 21 is pressed by the plug-in part 31, so that the end of the elastic part 21 moves towards the side wall of the first groove in the axial direction of the rigid structure 22. After the plug-in part 31 is reliably connected with the connecting structure 2, the end of the elastic part 21 abuts against the side wall of the first groove, so as to meet the requirements of mechanical connection and electrical connection between the plug-in part 31 and the connecting structure 2.

[0055] In addition, with reference to Figure 1 and Figure 8 , Figure 8 A structure for displaying the substrate 12, the substrate 12 includes a mounting hole 121, along the axial direction of the rigid structure 22, part of the rigid structure 22 penetrates the substrate 12 of the support structure 1 through the mounting hole 121, and the rigid structure 22 is connected with the support structure 1 by a fastener, so as to realize the mechanical connection between the rigid structure 22 and the support structure 1.

[0056] It should be noted that the EEG acquisition device provided by the present application can be provided with one-to-one corresponding multiple connecting structures 2 and multiple electrode units 3. At this time, the substrate 12 needs to be provided with multiple mounting holes 121, and the multiple mounting holes 121 correspond one-to-one to the multiple connecting structures 2. For example, 18 through holes are arranged on the electrode substrate, and an EEG signal amplifier is arranged on the rear side of the electrode substrate. The EEG signal amplifier contains a control circuit board inside. The wires of the 18 electrodes are connected to the control circuit board through an XH-2.0-10 connector and an XH-2.0-8 connector. The front, top, two sides and rear of the electrode substrate are respectively provided with connecting structures.

[0057] It is worth mentioning that, in an optional embodiment, the rigid structure 22 made of conductive metal material can be provided with a jack, and the plug-in part 31 is directly plugged into the jack of the rigid structure 22, so as to realize the electrical connection between the plug-in part and the rigid structure 22. In addition, with reference to Figure 5 and Figure 6 In a specific embodiment, the rigid structure 22 further includes a first face 222, and the extension surface of the first face 222 penetrates the axis of the rigid structure 22. For example, the first face 222 can extend in the radial direction of the rigid structure 22. In the axial direction of the rigid structure 22, the limiting part 221 is spaced apart from the first face 222. The first face 222 can be an end face of the rigid structure 22.

[0058] In the specific setting of the limiting portion 221, the limiting portion 221 can be a protrusion arranged along the inner wall of the rigid structure 22 towards the axis direction, and along the axial direction of the rigid structure 22, the limiting portion 221 includes oppositely arranged second and third faces. Referring to Figure 9 , Figure 9 For Figure 1 A structural schematic diagram of the plug-in portion of the electroencephalogram acquisition device provided. The side wall of the plug-in portion 31 is provided with an abutting portion 311, which can be a protrusion welded on the side wall of the plug-in portion 31, and in addition, the protrusion can also be integrally formed with the plug-in portion 31. Referring to Figure 5 、 Figure 6 and Figure 9 When the plug-in portion 31 is inserted into the connecting structure 2, along the axial direction of the rigid structure 22, the second face of the limiting portion 221 is away from the first face 222 relative to the third face, and the abutting portion 311 is located on the side of the limiting portion 221 away from the first face 222 and abuts against the limiting portion 221. Specifically, the abutting portion 311 can be abutted against the second face of the limiting portion 221 to limit the movement of the plug-in portion 31 along the negative direction of the Z axis. Moreover, the part of the electrode unit 3 away from the limiting portion 221 relative to the first face 222 abuts against the first face 222, and the outer side wall of the plug-in portion 31 can be provided with a protrusion, and when the plug-in portion 31 is inserted into the connecting structure 2, the protrusion is located on the side of the first face 222 away from the limiting portion 221 and abuts against the first face 222 to limit the movement of the plug-in portion 31 along the positive direction of the Z axis. Since the elastic portion 21 limits the radial movement of the plug-in portion 31, the electroencephalogram acquisition device provided by the present application can meet the reliability of the mechanical and electrical connection between the plug-in portion 31 and the connecting structure 2 while simplifying the structure of the electroencephalogram acquisition device.

[0059] It is worth mentioning that the inner wall of the rigid structure 22 can be provided with at least two limiting portions 221, and along the circumferential direction of the rigid structure 22, the adjacent two limiting portions 221 are arranged at intervals. At the same time, the plug-in portion 31 is provided with at least two abutting portions 311, and the at least two abutting portions 311 correspond one-to-one to the at least two limiting portions 221.

[0060] The application takes two limiting portions 221 and two abutting portions 311 as an example. During the process of inserting the insertion portion 31 into the connection structure 2, first, the two abutting portions 311 are respectively arranged in the gaps between the two limiting portions 221, so that the two abutting portions 311 move along the positive direction of the Z axis through the corresponding gaps to the side of the first surface 222 of the rigid structure 22 away from the limiting portion 221, and then the insertion portion 31 is rotated, so that the two abutting portions 311 are respectively abutted with the two limiting portions 221, so as to limit the movement of the insertion portion 31 along the negative direction of the Z axis, and improve the connection reliability of the insertion portion 31 and the connection structure 2. At the same time, the part of the electrode unit 3 away from the limiting portion 221 abuts against the first surface 222, so as to limit the movement of the insertion portion 31 along the positive direction of the Z axis.

[0061] In the specific setting of the insertion portion 31, as shown in Figure 9 , in order to meet the stability of the electrical connection between the insertion pins and the insertion holes, the insertion portion 31 can be set as a stepped cylindrical shape, and the overall size and rigidity thereof can be adjusted according to actual needs. For example, the overall height is 12-15 mm, the outer diameter of the small end is 2 mm, the height of the abutting portion 311 at the top of the insertion portion 31 is 0.8-1.5 mm, and the thickness is 0.1-0.3 mm.

[0062] In one specific embodiment, referring to Figure 7 , Figure 10 , Figure 11 , Figure 10 a structural schematic diagram of the connection structure 2 is provided for showing; Figure 11 a cross-sectional view of the insertion portion 31 and the connection structure 2 of the electroencephalogram acquisition device provided by Figure 4 , in which the limiting portion 221 includes an elastic cantilever 2211, as shown in Figure 10As shown, the open end of the elastic cantilever 2211 extends along the circumference of the rigid structure 22. It can be understood that the fixed end of the elastic cantilever 2211 can be arranged on the second surface of the limiting portion 221, and when the plug-in portion 31 is separated from the connecting structure 2, the elastic cantilever 2211 gradually increases in distance from the second surface in the direction from the fixed end to the open end, and the distance between the open end of the elastic cantilever 2211 and the first surface 222 is n. In this way, in the process of inserting the plug-in portion 31 into the connecting structure 2, the abutting portion 311 of the plug-in portion 31 gradually rotates along one side of the fixed end of the elastic cantilever 2211 towards the open end, the open end of the elastic cantilever 2211 is forced to move along the negative direction of the Z axis, and the contact resistance between the abutting portion 311 and the elastic cantilever 2211 gradually decreases. In this way, after the plug-in portion 31 and the first surface 222 of the rigid structure 22 are stably abutted, the distance between the open end of the elastic cantilever 2211 and the first surface 222 is m, and it can be understood that n > m. Therefore, by arranging the elastic cantilever 2211 to reduce the contact resistance between the plug-in portion 31 and the connecting structure 2, the stability of the electrical connection between the plug-in portion 31 and the connecting structure 2 is further improved.

[0063] It should be noted that, as Figure 10 shown, when the rigid structure 22 includes two limiting portions 221, the open end of the elastic cantilever 2211 on one limiting portion 221 is adjacent to the fixed end of the elastic cantilever 2211 on the other limiting portion 221, so as to meet the connection requirement of the abutting portion 311 and the elastic cantilever 2211.

[0064] It is worth mentioning that, in a specific embodiment, referring to Figure 7 and Figure 12 , Figure 12 for showing Figure 11 the enlarged view of A, the elastic cantilever 2211 is provided with a locking structure 22111, wherein the locking structure 22111 can be a protrusion or a bending arranged on the elastic cantilever 2211, and when the plug-in portion 31 is inserted into the connecting structure 2, the locking structure 22111 is located between the abutting portion 311 and the fixed end of the elastic cantilever 2211, so that the locking structure 22111 limits the abutting portion 311, reduces the risk of the abutting portion 311 rotating towards the fixed end of the elastic cantilever 2211 due to the force of the elastic cantilever 2211 on the abutting portion 311, and improves the stability of the electrical connection between the plug-in portion 31 and the connecting structure 2, and improves the reliability of the mechanical connection between the plug-in portion 31 and the connecting structure 2.

[0065] Continuing to refer to Figure 7In an alternative embodiment, the open end of the elastic cantilever 2211 is provided with a pressing portion 22112 along the axial direction of the plug-in portion 31, and the pressing portion 22112 extends away from the first surface 222, i.e. the pressing portion 22112 can be a bending towards the positive direction of the Z-axis. Since the rigid structure 22 is in a cylindrical shape, the pressing portion 22112 can extend from inside the cylinder to outside the cylinder, so that when the electrode unit 3 is separated from the connecting structure 2, pressure can be applied to the pressing portion 22112 to move the open end of the elastic cantilever 2211 towards the negative direction of the Z-axis, so that the locking structure 22111 of the elastic cantilever 2211 is separated from the abutting portion 311 (protrusion) of the plug-in portion 31, at this time the plug-in portion 31 can be rotated to make the abutting portion 311 disengage from the limiting portion 221 of the rigid structure 22, then the plug-in portion 31 can be pulled to quickly separate the plug-in portion 31 from the connecting structure 2.

[0066] With reference to the above Figure 11 In an alternative embodiment, the connecting structure 2 further comprises a first insulating shell 23, which can be made of plastic. The first insulating shell 23 wraps the rigid structure 22 along the circumferential direction of the rigid structure 22, and the first insulating shell 23 is stepped along the axial direction, wherein the smaller diameter end penetrates the support structure 1, and the larger diameter end abuts the support structure 1, and the smaller diameter end is provided with external threads, and the first insulating shell 23 is connected to the support structure 1 by a nut, so as to achieve reliable connection between the connecting structure 2 and the support structure 1, and simplify the connecting structure 2.

[0067] In addition, there is a gap between the inner wall of the larger diameter portion of the first insulating shell 23 and the outer wall of the rigid structure 22, which is used to fill a fixing glue, such as ultraviolet light curing glue, to achieve reliable connection between the first insulating shell 23 and the rigid structure 22.

[0068] With reference to the above Figure 11 In an alternative embodiment, the electrode unit 3 further comprises a second insulating shell 33, and the plug-in portion 31 penetrates the second insulating shell 33 along the axial direction of the plug-in portion 31, and is fixedly connected with the plug-in portion 31. Specifically, the second insulating shell 33 comprises a second recess 331 and a third recess 332 arranged oppositely, and the bottom of the second recess 331 is provided with a through hole, and the second recess 331 communicates with the third recess 332 of the second insulating shell 33 through the through hole. The plug-in portion 31 penetrates the second recess 331 and the third recess 332 in sequence, and one end of the plug-in portion 31 is located in the second recess 331, and part of the electrode portion 32, such as the flexible arm 322, is also located in the second recess 331, and the second recess 331 is filled with a conductive medium, which is exemplarily a two-component conductive silver glue, to achieve mechanical connection and electrical connection between the plug-in portion 31 and the electrode portion 32, and simplify the structure of the electrode unit 3.

[0069] In addition, the other part of the plug-in part 31 extends out of the slot of the third groove 332, is used for being inserted into the connecting structure 2, and when the plug-in part 31 is inserted into the connecting structure 2, the end surface (the first surface) of the rigid structure 22 can be abutted with the second insulating shell 33 or the solidified conductive medium, so as to achieve the limiting of the plug-in part 31.

[0070] In summary, by using the electroencephalogram acquisition device provided in the present application, since the plug-in part 31 of the electrode unit 3 is used for being inserted into the connecting structure 2, and the plug-in part 31 is limited in the connecting structure 2 along the axial direction and the radial direction of the plug-in part 31, the mechanical connection and the electrical connection between the electrode unit 3 and the connecting structure 2 can be reliable, and the detachable connection between the two can be achieved, so as to effectively improve the convenience of operation and maintenance of the electroencephalogram acquisition device.

[0071] In addition, since the electrode part 32 absorbs and releases the conductive solution, the electroencephalogram signal of the user's head can be transmitted to the electrode part 32 through the conductive solution. Compared with the conductive paste, the conductive solution belongs to a liquid, on the one hand, during the electroencephalogram signal acquisition process, the conductive solution can be uniformly distributed on the user's head, which can effectively reduce the contact resistance between the electrode part 32 and the head, and improve the signal transmission effect. On the other hand, after the electroencephalogram signal acquisition is completed, the conductive solution can volatilize by itself, and will not stick to the user's head like the conductive paste, so that the user does not need to clean the head after the electroencephalogram signal acquisition is completed, thereby effectively improving the user experience.

[0072] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and the equivalent technologies thereof, the present application also intends to include these modifications and variations.

Claims

1. An electroencephalogram acquisition device, characterized by, The electrode unit comprises a plug-in part and an electrode part, the plug-in part is used for being inserted into the connecting structure, and the plug-in part is limited in the connecting structure and electrically connected with the connecting structure along the axial and radial directions of the plug-in part; When the plug-in part is inserted into the connecting structure, the electrode part is arranged on the side of the plug-in part away from the connecting structure and is electrically connected with the plug-in part; the electrode part is used for absorbing and releasing the conductive solution and is used for contacting the head; The connecting structure comprises an elastic part, the elastic part is used for forming a plug hole for inserting the plug-in part; When the plug-in part is inserted into the plug hole, the elastic part extrudes the plug-in part along the radial direction of the plug-in part; The connecting structure further comprises a rigid structure in the shape of a cylinder, the rigid structure is sleeved on the outside of the elastic part along the circumferential direction of the elastic part and is connected with the elastic part; The rigid structure comprises a first surface and a limiting part, the extension surface of the first surface penetrates the axis of the rigid structure; the limiting part is arranged on the inner wall of the rigid structure along the circumferential direction of the rigid structure; the side wall of the plug-in part is provided with an abutting part; The limiting part comprises an elastic cantilever, the open end of the elastic cantilever extends along the circumferential direction of the rigid structure; When the plug-in part is inserted into the connecting structure, the abutting part abuts against the open end of the elastic cantilever along the axial direction of the plug-in part, and the distance between the open end of the elastic cantilever and the first surface is m; When the plug-in part is separated from the connecting structure, the distance between the open end of the elastic cantilever and the first surface along the axial direction of the plug-in part is n, and n>m; The elastic cantilever is provided with a locking structure; when the plug-in part is inserted into the connecting structure, the locking structure is located between the abutting part and the fixed end of the elastic cantilever; The open end of the elastic cantilever is provided with a pressing part which extends away from the first surface along the axial direction of the plug-in part. Part of the rigid structure penetrates the support structure along the axial direction of the rigid structure and is connected with the support structure through a fastener. The limiting part is arranged away from the first surface along the axial direction of the rigid structure; 2. The electroencephalogram acquisition apparatus according to claim 1, wherein When the plug-in part is inserted into the connecting structure, the abutting part is located on the side of the limiting part away from the first surface along the axial direction of the rigid structure, abuts against the limiting part, and the part of the electrode unit away from the limiting part relative to the first surface abuts against the first surface.

3. The electroencephalogram acquisition apparatus according to claim 2, wherein The connecting structure further comprises a first insulating shell, the first insulating shell wraps the rigid structure along the circumferential direction of the rigid structure; Part of the first insulating shell penetrates the support structure along the axial direction of the rigid structure, and the part of the first insulating shell penetrating the support structure is connected with the support structure through the fastener.

4. The electroencephalogram acquisition apparatus according to claim 2, wherein The electrode unit further comprises a second insulating shell, the plug-in part penetrates the second insulating shell along the axial direction of the plug-in part; ​ 5. The electroencephalogram acquisition apparatus according to claim 1, wherein ​ The second insulating shell comprises a second groove for accommodating a conductive medium; the part of the electrode portion and the part of the plug-in portion are located in the second groove and are fixedly connected and electrically connected through the conductive medium.

6. The electroencephalogram acquisition apparatus according to claim 1, wherein The electrode portion comprises a liquid absorbing portion and a flexible arm, and the liquid absorbing portion is electrically connected with the plug-in portion through the flexible arm; the liquid absorbing portion is used for absorbing and releasing the conductive solution.

Images