Dry-type brain electrode and electroencephalogram cap

Abstract

The utility model relates to the technical field of electroencephalogram acquisition equipment, in particular to a dry type brain electrode and an electroencephalogram cap. The dry type brain electrode comprises an electrode needle and a base used for loading the electrode needle. The base is used for being installed on the wearable device. The base is provided with an assembling end face used for installing the electrode needle. And a conductive circuit is arranged in the base. The conductive circuit is connected with the electrode needle. And the plurality of electrode needles are circularly arranged on the assembly end face along the center line of the base to form a detection unit. The electrode needle comprises a connection section and a detection section which are connected in sequence. The connecting section is connected with the assembling end face of the base. The cross-sectional area of the detection section is smaller than that of the connection section. According to the dry type brain electrode, the multiple electrode needles are loaded on the base, the electrode needles penetrate through the hair of the head of the human body, the end of the detection section is made to make contact with the scalp surface, and therefore the function of collecting electroencephalogram signals is achieved, the reliability of contact between the detection section and the epidermis of the head is improved, and the stability of electroencephalogram signal collection is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electroencephalogram (EEG) acquisition equipment, in particular to a dry-type EEG electrode and an EEG cap. Background Art

[0002] EEG is a device used to monitor the brain's electrical activity or transmit electrical signals to the brain. When used, EEG is usually attached to the surface of the human scalp to reflect the brain's activity by recording the electrical signals of the discharge of neurons in the human brain. EEG is suitable for a variety of medical and research applications, including electroencephalograms, neuromodulation and other applications. For example, EEG records the brain's electrical activity through electrodes on the scalp and is often used to diagnose epilepsy and other brain diseases; neuromodulation applications use electrodes to manipulate the brain's electrical activity and affect neural circuits.

[0003] Among them, brain electrodes are mainly divided into three categories: dry electrodes, wet electrodes and semi-dry electrodes. For example, Chinese patent document CN219720704U discloses an EEG signal acquisition device. The acquisition component of the EEG signal acquisition device includes an electrode head and an elastic member, the electrode head is mounted on the first end of the elastic member, and the second end of the elastic member is mounted on the shell. The electrode head is located on the inner side of the shell, the acquisition direction of the electrode head is toward the cerebral cortex, and the pressure applied by the electrode head is weakened by the elastic member.

[0004] However, in actual use, the electrode head needs to pass through the hair and then contact the scalp to achieve signal acquisition. For individuals with thick hair, it may be difficult for the electrode head to properly contact the scalp, thus affecting signal acquisition. In addition, due to the interference of the hair, it is difficult for the electrode head to pass through the hair and fully contact the scalp. Especially when the tester is in motion, the electrode head will generate a lot of noise signals, which greatly affects the stability of signal acquisition. Summary of the invention

[0005] The purpose of the utility model is to provide an electrode structure during the use of an electroencephalogram (EEG) acquisition device, so as to more smoothly pass through the hair, ensure full contact with the scalp, and improve the stability of EEG signal acquisition.

[0006] To achieve the above purpose, the utility model proposes the following solutions:

[0007] A dry brain electrode comprises an electrode needle and a base for loading the electrode needle;

[0008] The base is used to be installed on the wearable device, and an assembly end surface for installing the electrode needle is provided on the base. A conductive circuit is provided inside the base, and the conductive circuit is connected to the electrode needle;

[0009] A plurality of electrode needles are arranged in a circular shape on the assembly end surface along the center line of the base to form a detection unit. The electrode needles include a connecting section and a detection section connected in sequence. The connecting section is connected to the assembly end surface of the base, and the cross-sectional area of ​​the detection section is smaller than the cross-sectional area of ​​the connecting section.

[0010] Preferably, a connection hole for embedding the electrode needle is provided on the assembly end surface, and a positioning section for embedding in the connection hole is also provided on the electrode needle, and the positioning section is connected to the connection section through a transition section. In this way, the electrode needle is connected to the base through the positioning section, which greatly reduces the difficulty of assembling the electrode needle and the base, and further ensures the installation position accuracy of the electrode needle.

[0011] Preferably, the ratio of the length of the detection section to the length of the connection section is 2 to 3. This arrangement avoids the risk of the detection section being too short and being interfered by hair, and the risk of the detection section being too long and reducing the overall structural strength of the electrode needle, thereby ensuring the stability of EEG signal acquisition.

[0012] Preferably, the end of the detection section is provided with a detection portion for contacting the scalp surface.

[0013] Preferably, the detection part is an arc-shaped surface. In this way, the arc-shaped detection part is conducive to increasing the contact area between the electrode needle and the scalp surface, thereby reducing the pressure on the scalp surface and further improving comfort.

[0014] Preferably, the cross-section of the detection section and the cross-section of the connecting section are both circular.

[0015] Preferably, the ratio of the diameter of the detection section to the diameter of the connection section is 0.25-0.75. In this way, the diameter of the connection section is larger than the diameter of the detection section, which is not only conducive to increasing the contact area between the connection section and the base, thereby improving the reliability of EEG signal transmission, but also conducive to reducing the interference of hair on the detection section.

[0016] Preferably, the base is provided with a connection buckle for mounting on the wearable device, and the conductive line extends to the connection buckle. In this way, the base is mounted on the wearable device through the connection buckle, which facilitates the EEG signals collected by multiple electrode needles to be concentratedly transmitted to the connection buckle through the conductive line, which is conducive to the signal acquisition device receiving the EEG signals.

[0017] The utility model also provides an electroencephalogram cap using the dry electroencephalogram electrode, comprising a cap body, on which the dry electroencephalogram electrode is installed.

[0018] Compared with the prior art, the dry-type brain electrode and EEG cap provided by the utility model have the following substantial features and progress: the dry-type brain electrode loads a plurality of electrode needles on a base, the electrode needles pass through the hair on the human head, and the end of the detection section contacts the surface of the scalp, thereby collecting EEG signals; by setting the cross-sectional area of ​​the detection section to be smaller than the cross-sectional area of ​​the connecting section, when the electrode needle passes through the hair, the resistance between the electrode needle and the hair can be reduced, and the interference of the hair on the EEG signal can be reduced, thereby improving the reliability of the contact between the detection section and the head epidermis, and improving the stability of EEG signal collection; compared with the existing brain electrode structure, in addition to ensuring the structural strength of the electrode needle itself, the weight of the electrode needle is also reduced, saving material costs; at the same time, the EEG cap equipped with the dry-type brain electrode not only reduces the resistance of the electrode needle passing through the hair, thereby ensuring the contact with the scalp surface, thereby improving the reliability of EEG signal collection, but also is easy for users to wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a dry EEG electrode in an embodiment of the utility model.

[0020] Figure 2 yes Figure 1 Front view of a dry EEG electrode.

[0021] Figure 3 yes Figure 2 Bottom view of .

[0022] Figure 4 It is a schematic diagram of the structure of the electrode needle in the embodiment of the utility model.

[0023] Figure numerals: 1, base; 2, electrode needle; 3, connecting buckle; 4, assembly end face; 21, connecting section; 22, detection section; 23, transition section; 24, positioning section; 25, detection part. DETAILED DESCRIPTION

[0024] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-Figure 4 As shown, a dry-type EEG electrode and an EEG cap are proposed in the embodiment of the utility model, which are intended to enable the electrode to pass through the hair more smoothly during the process of EEG signal acquisition by the EEG acquisition device, ensure full contact with the scalp, and improve the stability of EEG signal acquisition.

[0026] A dry-type EEG electrode proposed in the embodiment of the utility model loads a plurality of electrode needles 2 on a base 1. The electrode needles 2 pass through the hair of the human head and make the end of the detection section 22 contact the surface of the scalp, thereby collecting EEG signals. By setting the cross-sectional area of ​​the detection section 22 of the electrode needle 2 to be smaller than the cross-sectional area of ​​the connecting section 21, the resistance between the electrode needle 2 and the hair can be reduced when the electrode needle 2 passes through the hair, and the interference of the hair on the EEG signal can be reduced, thereby improving the reliability of the contact between the detection section 22 and the head epidermis and improving the stability of EEG signal collection. Compared with the existing EEG electrode structure, the dry-type EEG electrode reduces the weight of the electrode needle 2 in addition to ensuring the structural strength of the electrode needle 2 itself, saving material costs.

[0027] like Figure 1 As shown, a dry brain electrode comprises an electrode needle 2 and a base 1 for loading the electrode needle 2. Figure 1 Combination Figure 3 As shown, the base 1 is used to be installed on the wearable device. The base 1 is provided with an assembly end surface 4 for installing the electrode needle 2. The base 1 is provided with a conductive circuit inside. The conductive circuit is connected to the electrode needle 2.

[0028] like Figure 2 Combination Figure 3 As shown, a plurality of electrode needles 2 are arranged in a circular shape along the center line of the base 1 on the assembly end face 4 to form a detection unit. For example, eight electrode needles 2 are installed on the base 1 in a circular shape. The arrangement of eight electrode needles 2 can increase the contact area with the scalp surface and reduce the pressure on the scalp surface. The number of electrode needles 2 can be selected according to design requirements. Among them, the number of electrode needles 2 is preferably 4-10. The plurality of electrode needles 2 are arranged in a circular shape on the assembly end face 4, which can also facilitate the processing of the base 1 and reduce the processing difficulty of the base 1.

[0029] like Figure 4 As shown, the electrode needle 2 includes a connecting section 21 and a detection section 22 connected in sequence. The connecting section 21 is connected to the assembly end surface 4 of the base 1. The cross-sectional area of ​​the detection section 22 is smaller than the cross-sectional area of ​​the connecting section 21. In this way, when the electrode needle 2 passes through the hair, the resistance between the electrode needle 2 and the hair can be reduced, and the interference of the hair on the EEG signal can be reduced, thereby improving the reliability of the contact between the detection section 22 and the head epidermis and improving the stability of the EEG signal collection. For example, the cross section of the detection section 22 and the cross section of the connecting section 21 are both circular.

[0030] like Figure 3 Combination Figure 4As shown, a connection hole for embedding the electrode needle 2 is provided on the assembly end face 4. A positioning section 24 for embedding in the connection hole is also provided on the electrode needle 2. The positioning section 24 is connected to the connecting section 21 through the transition section 23. In this way, the electrode needle 2 is connected to the base 1 through the positioning section 24, which greatly reduces the difficulty of assembling the electrode needle 2 and the base 1, and further ensures the installation position accuracy of the electrode needle 2.

[0031] The electrode needle 2 is made of copper plated with gold, which can not only ensure the structural strength of the electrode needle 2, but also ensure the conductivity of the electrode needle 2.

[0032] like Figure 2 As shown, the end of the detection section 22 is provided with a detection portion 25 for contacting the scalp surface. For example, the detection portion 25 is an arc-shaped surface. In this way, the arc-shaped detection portion 25 is conducive to increasing the contact area between the electrode needle 2 and the scalp surface, thereby reducing the pressure on the scalp surface and further improving comfort.

[0033] In order to further improve the stability of the electrode needle 2 in collecting EEG signals, the size structure of the electrode needle 2 is optimized in the embodiment of the utility model.

[0034] The ratio of the length of the detection section 22 to the length of the connection section 21 is 2-3. This arrangement not only avoids the risk of the detection section 22 being too short and being interfered by the hair, but also avoids the risk of the detection section 22 being too long and reducing the overall structural strength of the electrode needle 2, thereby ensuring the stability of EEG signal acquisition. For example, the ratio of the length of the detection section 22 to the length of the connection section 21 is 2.5, that is, when the length of the detection section 22 is 120 mm, the length of the connection section 21 is 48 mm.

[0035] The ratio of the diameter of the detection section 22 to the diameter of the connection section 21 is 0.25-0.75. In this way, the diameter of the connection section 21 is larger than the diameter of the detection section 22, which is not only conducive to increasing the contact area between the connection section 21 and the base 1, thereby improving the reliability of EEG signal transmission, but also conducive to reducing the interference of hair on the detection section 22. For example, the ratio of the diameter of the detection section 22 to the connection section 21 is 0.5, that is, when the diameter of the detection section 22 is 15 mm, the diameter of the connection section 21 is 30 mm.

[0036] In order to further reduce the difficulty of assembling the base 1 and the wearable device, the wearable device includes an EEG cap or an EEG ring. Figure 1 As shown, the base 1 is provided with a connection buckle 3 for mounting on a wearable device. The conductive line extends to the connection buckle 3. In this way, the base 1 is mounted on the wearable device through the connection buckle 3, so that the EEG signals collected by the multiple electrode needles 2 are conveniently transmitted to the connection buckle 3 through the conductive line, which is beneficial for the signal acquisition device to receive the EEG signals.

[0037] In addition, an EEG cap is also proposed in the embodiment of the utility model. The EEG cap includes a cap body, on which a plurality of dry EEG electrodes are mounted. The dry EEG electrodes are detachably mounted on the electrode mounting position of the cap body through a connecting buckle 3. The EEG cap equipped with dry EEG electrodes not only reduces the resistance of the electrode needle 2 passing through the hair, thereby ensuring contact with the scalp surface, thereby improving the reliability of EEG signal collection, but also facilitates the user to wear it.

[0038] When using a dry EEG electrode proposed in the embodiment of the utility model, the base 1 is installed on the wearable device to ensure that the base 1 is firmly fixed in an appropriate position. The wearable device can be a headband, a hat or any other device that can be securely fixed on the head. Before the electrode needle 2 collects the EEG signal, ensuring good electrical contact between the electrode needle 2 and the conductive circuit involves confirming the integrity of the electrical connection and the smoothness of the conductive circuit.

[0039] Subsequently, depending on the shape of the scalp and the distribution of hair, the electrode needle 2 may need to be fine-tuned to ensure that the detection segment 22 properly contacts the scalp. A smaller cross-sectional area of ​​the detection segment 22 can help reduce the pressure on the scalp while providing sufficient contact area to detect EEG signals.

[0040] Connect the conductive lines in the base 1 to the signal processing equipment so that the signals detected by the electrode needle 2 can be transmitted to the processing equipment for further amplification, filtering and analysis. Before starting monitoring, perform a system test to verify the quality of the signal and the function of the electrode needle 2, including checking the noise level, signal strength and stability. Once it is confirmed that all devices are installed correctly and the system is working properly, the EEG signal monitoring process can begin. During monitoring, pay attention to the user's comfort and signal quality, and adjust the position if necessary.

[0041] The present invention is not limited to the specific technical solutions described in the above embodiments. In addition to the above embodiments, the present invention may also have other implementation modes. For those skilled in the art, any technical solutions formed by any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dry EEG electrode, characterized in that: It comprises an electrode needle (2) and a base (1) for loading the electrode needle (2); The base (1) is used for being mounted on a wearable device, and an assembly end surface (4) for mounting an electrode needle (2) is provided on the base (1), and a conductive circuit is provided inside the base (1), and the conductive circuit is connected to the electrode needle (2); A plurality of electrode needles (2) are arranged in a circular shape on an assembly end surface (4) along a center line of a base (1) to form a detection unit, wherein the electrode needle (2) comprises a connecting section (21) and a detection section (22) which are connected in sequence, wherein the connecting section (21) is connected to the assembly end surface (4) of the base (1), and the cross-sectional area of ​​the detection section (22) is smaller than the cross-sectional area of ​​the connecting section (21).

2. The dry EEG electrode according to claim 1, characterized in that: The assembly end surface (4) is provided with a connection hole for embedding the electrode needle (2), and the electrode needle (2) is also provided with a positioning section (24) for embedding in the connection hole, and the positioning section (24) is connected to the connection section (21) via a transition section (23).

3. The dry EEG electrode according to claim 1, characterized in that: The ratio of the length of the detection section (22) to the length of the connecting section (21) is 2-3.

4. The dry EEG electrode according to claim 1, characterized in that: The end of the detection section (22) is provided with a detection portion (25) for contacting the scalp surface.

5. The dry EEG electrode according to claim 4, characterized in that: The detection portion (25) is a curved surface.

6. The dry EEG electrode according to claim 1, characterized in that: The cross-section of the detection section (22) and the cross-section of the connecting section (21) are both circular.

7. The dry EEG electrode according to claim 6, characterized in that: The ratio of the diameter of the detection section (22) to the diameter of the connecting section (21) is 0.25-0.

75.

8. The dry EEG electrode according to claim 1, characterized in that: The base (1) is provided with a connecting buckle (3) for mounting on a wearable device, and the conductive line extends to the connecting buckle (3).

9. An electroencephalogram cap, comprising a cap body, characterized in that: The cap body is mounted with a dry EEG electrode as described in any one of claims 1 to 8.

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