Electroencephalogram sensing electrode and use method thereof

Abstract

The invention discloses an electroencephalogram sensing electrode and a using method thereof.The electroencephalogram sensing electrode comprises a shell assembly, the shell assembly comprises a shell, a base and a top cover, the shell and the base are connected to form a slow-release probe containing cavity, the shell and the top cover are connected to form a liquid storage cavity, and a fluid valve, a slow-release material, a capillary hole plug, a rapid flow hole and a slow flow hole are arranged in the shell assembly; a semi-dry electrode is made by injecting conductive liquid or a wet electrode is made by injecting conductive paste, and through a fluid valve, a slow-release material, a capillary hole plug, a quick flow hole and a slow flow hole, the electrode can quickly supply liquid to the position between the electrode and the scalp to reduce resistance and slowly supply liquid to reduce resistance, and the electrode-scalp interface impedance can be quickly reduced and can be balanced and stabilized for a long time. The electrode has the advantages that the electrode can be used as a semi-dry electrode by injecting conductive liquid, can also be used as a wet electrode by injecting conductive paste, and has the functions of storing the conductive liquid for a long time without releasing the conductive liquid when the electrode is idle and supplying the conductive liquid in two modes of fast and slow to reduce scalp-electrode impedance when a user wears the electrode to acquire signals.

Description

Technical Field

[0001] The present invention relates to the field of electroencephalogram (EEG) sensing technology, and in particular to an EEG sensing electrode and a method for using the same. Background Art

[0002] At present, EEG is an electrical phenomenon formed on the scalp or cerebral cortex when brain neurons transmit information through ions. It reflects the physiological electrical activity of brain nerve tissue. When the brain is thinking, stimulated or the human body is in a certain state, the frequency and amplitude of EEG will change rapidly, generating signal characteristics related to the stimulation. Brain-computer interface technology mainly collects scalp EEG signals that can reflect the state of the brain through EEG sensor electrodes placed on the surface of the scalp. EEG sensor electrodes are divided into wet electrodes, semi-dry electrodes and dry electrodes. Among them, semi-dry electrodes are an electrode between wet electrodes and dry electrodes. By injecting the stored conductive liquid between the scalp and the electrode, the purpose of reducing the scalp-electrode impedance is achieved, effectively saving the electrode deployment time. In theory, the signal quality of the semi-dry electrode is between the dry electrode and the wet electrode, but the supply of the conductive liquid on the interface is unstable. When the liquid supply is insufficient, the impedance is too large. When the liquid supply is too much, it may cause signal crosstalk between multi-channel electrodes. In fast wear applications, it is necessary to quickly reduce the scalp-electrode impedance. When the conductive liquid is used for the treatment of brain damage, it is necessary to increase the supply speed of the conductive liquid, while the existing semi-dry EEG electrodes only have the function of slowly releasing the conductive liquid, and do not have the ability to quickly increase the liquid and reduce the resistance again after the EEG cap is worn; in addition, the existing EEG electrode conductive liquid supply method is mainly a one-time filling at the beginning of use or filling with slow-release materials. As the conductive liquid evaporates, the scalp-electrode impedance will increase rapidly until the electrode fails. Due to the lack of a convenient method for replenishing or filling the electrode conductive liquid, the effective life of the EEG electrode is short, which limits the EEG acquisition schedule and the application efficiency of the brain-computer system.

[0003] In summary, there is at least one of the following technical problems:

[0004] The supply of conductive liquid is unbalanced and unstable; it does not have the function of storing the conductive liquid for a long time without releasing it when idle, and it does not have the function of supplying the conductive liquid in fast or slow modes to reduce the scalp-electrode impedance when wearing to collect signals; the conductive liquid filling method is single, the application is not flexible, and the effective collection time of EEG signals is short. Summary of the invention

[0005] The main purpose of the present invention is to provide an EEG sensor electrode and a method of using the same, so as to solve the problems in the prior art of unbalanced and unstable supply of conductive liquid; lack of the function of storing conductive liquid for a long time without releasing it when idle, and supplying conductive liquid in two modes, fast and slow, to reduce the scalp-electrode impedance when worn to collect signals; single conductive liquid filling method, inflexible application, and short effective EEG signal collection time.

[0006] In order to achieve the above object, according to one aspect of the present invention, there is provided an electroencephalogram sensing electrode, comprising:

[0007] The housing assembly comprises a housing, a base and a top cover, the housing is connected to the base to form a slow-release probe cavity, the housing is connected to the top cover to form a liquid storage cavity, and the housing assembly is provided with a fluid valve, a slow-release material, a capillary plug, a fast-flow hole and a slow-flow hole;

[0008] Among them, by injecting conductive liquid to make a semi-dry electrode or injecting conductive paste to make a wet electrode, the electrode can quickly supply liquid to reduce resistance or slowly supply liquid to reduce resistance between the electrode and the scalp through fluid valves, sustained-release materials, capillary plugs, fast-flow holes and slow-flow holes. The electrode-scalp interface impedance can be reduced quickly and maintained in a balanced and stable state for a long time.

[0009] Preferably, a shell assembly, the shell assembly comprises a shell, a base and a top cover, the shell and the base are connected to form a slow-release probe cavity, the shell and the top cover are connected to form a liquid storage cavity, and the shell assembly is provided with a fluid valve, a slow-release material, a capillary plug, a fast-flow hole and a slow-flow hole;

[0010] Among them, by injecting conductive liquid to make a semi-dry electrode or injecting conductive paste to make a wet electrode, the electrode can quickly supply liquid to reduce resistance or slowly supply liquid to reduce resistance between the electrode and the scalp through fluid valves, sustained-release materials, capillary plugs, fast-flow holes and slow-flow holes. The electrode-scalp interface impedance can be reduced quickly and maintained in a balanced and stable state for a long time.

[0011] Preferably, the shell is a cylinder with a stepped through hole inside, and the two ends of the shell are internally provided with a rotating snap-on locking structure. One side of the middle annular boss of the inner hole of the shell is a sensing component groove, and the other side is a valve body guide groove. There is a conical sealing hole between the sensing component groove and the valve body guide groove, and a slow flow hole and a fast flow hole are provided on the inner annular boss of the shell. The slow flow hole connects the upper end face of the inner annular boss of the shell with the conical surface of the conical sealing hole, and the fast flow hole connects the bottom end face of the valve body guide groove with the lower end face of the inner annular boss of the shell.

[0012] Preferably, a stepped groove is disposed on the lower end surface of the annular boss of the inner hole of the shell, and a liquid inlet channel, a liquid outlet channel and a cable channel are disposed on the outer coin of the shell.

[0013] Preferably, the base is an annular body with a bowl-shaped through hole disposed inside, and a locking boss and two annular bosses are disposed on the outer surface of the annular body, and an annular groove for fixing the electrode is formed between the two annular bosses.

[0014] Preferably, the top cover is a stepped cylinder with a through hole in the middle, an O-ring groove is provided on the outer surface of the small cylinder, an annular boss with four notches is provided on the outer surface of the large cylinder, and a spring limit groove is provided on the bottom end surface of the top cover.

[0015] Preferably, the fluid valve comprises a valve body and a valve core, wherein the valve body is a stepped cylinder with a stepped through hole in the middle, wherein a spring limit groove is arranged on the upper surface of the cylinder with a large diameter, a sealing gasket groove is arranged on the lower surface of the cylinder with a large diameter, a liquid injection hole is arranged on the upper surface of the cylinder with a small diameter, and an O-ring groove is arranged on the outer surface of the cylinder with a small diameter, and the large hole inside the valve body is a valve cavity, which is connected to the liquid injection hole. The valve core is a cylinder with a built-in through hole and a conical boss on the outer surface, and an O-shaped circular groove is arranged on the surface of the conical boss.

[0016] Preferably, it also includes a sensing contact and a slow-release probe, the sensing contact body is placed in the sensing component slot of the shell, the sensing contact wire is fixed with a clamp after passing through the cable channel of the shell, the sensing contact is a bioelectric sensing component, the head body of the sensing probe is a circular ring structure, an extension wire is provided on the side of the circular ring structure, and the sensing probe is used to collect and transmit electrical signals; the slow-release probe is placed in the slow-release probe cavity of the shell assembly, the slow-release probe is an elastic cone, and a circular groove is provided on the upper end face of the slow-release probe.

[0017] Preferably, the capillary plug is placed in the slow-flow hole of the shell in the shell assembly; the O-ring C is placed in the O-ring groove on the conical surface of the valve core, forming a seal between the valve core and the surface of the conical sealing hole of the shell, and can move with the valve core; the valve core spring is sleeved on the outer surface of the valve core, one end of which is limited to the end face of the conical boss of the valve core, and the other end is limited to the bottom end face of the valve cavity of the valve body. When the valve core is forced to move upward, the sealing channel between the valve core and the surface of the conical sealing hole of the shell is opened, and the conductive liquid in the liquid storage cavity of the shell assembly enters the slow-release probe cavity of the shell assembly through the capillary plug and the slow-flow hole and the conical sealing hole of the shell, is absorbed by the slow-release probe, and is slowly released to the electrode-scalp surface, thereby reducing the interface impedance. When the conductive liquid released to the electrode-scalp surface reaches a balance with the conductive liquid lost by volatilization, the interface impedance balance and stability can be maintained for a long time.

[0018] Preferably, the annular sealing gasket is placed in the valve body sealing groove, which can move up and down with the valve body, and can block and open the shell fast flow hole; the valve body spring is sleeved on the outer surface of the valve body, one end is limited in the valve body spring limit groove, and the other end is limited in the spring limit groove on the bottom end face of the top cover. When the valve body is forced to move upward, the fast flow hole is opened, and the conductive liquid in the liquid storage cavity can quickly flow to the slow-release probe cavity through the fast flow hole, and quickly released to the electrode-scalp surface, quickly reducing the interface impedance. At this time, the valve body spring is in a compressed state. When the force is cancelled, under the action of the valve body spring, the valve body moves downward, and the shell fast flow hole is sealed through the annular sealing gasket on the end face of the valve body.

[0019] According to another aspect of the present invention, a method for using an electroencephalogram sensor electrode is provided, comprising:

[0020] Through the annular groove formed between the two annular bosses of the base, it is fixed in the electrode mounting holes at various points on the EEG cap body. The EEG cap body is combined with multiple EEG sensing electrodes to form an EEG cap that can collect EEG signals:

[0021] When the subject does not wear the EEG cap, that is, the EEG sensing electrodes in the EEG cap are not in contact with the scalp, under the action of the valve core spring, the valve core is tightly fitted to the surface of the conical sealing hole of the shell, and under the action of the O-ring C, the valve core and the surface of the conical sealing hole of the shell are reliably sealed, and the conductive liquid in the liquid storage cavity of the shell component cannot enter the slow-release probe cavity of the shell component through the capillary plug and the slow-flow hole through the conical sealing hole of the shell, and the slow-release probe does not absorb the conductive liquid, and the conductive liquid cannot be volatilized and lost through the slow-release probe. At this time, the conductive liquid is stored in the liquid storage cavity of the shell component;

[0022] When the subject wears the EEG cap, the EEG sensing electrode in the EEG cap contacts the scalp, squeezing the slow-release probe, pushing the valve core upward, and the sealing channel between the valve core and the surface of the conical sealing hole of the shell is opened. The conductive liquid in the liquid storage cavity of the shell component enters the slow-release probe cavity of the shell component through the capillary plug and the slow-flow hole through the conical sealing hole of the shell, is absorbed by the slow-release probe, and is slowly released to the electrode-scalp surface, thus opening the propagation path of the EEG signal from the scalp to the electrode contact, and at the same time moistening the scalp tissue to reduce the interface impedance. When the conductive liquid released to the electrode-scalp surface reaches a balance with the conductive liquid lost by evaporation, the interface impedance balance and stability can be maintained for a long time.

[0023] When the subject wears the EEG cap, the slow-release probe slowly releases the conductive liquid to open the signal transmission path and reduce the interface impedance. The conductive liquid is released slowly, and it takes a long time for the interface impedance to be reduced to the range allowed by the test. The impedance reduction process takes a long time and cannot meet the requirements of rapid impedance reduction for some tests. At this time, the EEG electrode can be pressed manually to increase the contact force between the electrode and the scalp, increase the deformation of the slow-release probe, push the valve body and the annular sealing gasket upward, open the fast-flow hole, and the conductive liquid in the liquid storage cavity can flow quickly to the slow-release probe cavity through the fast-flow hole, and be quickly released to the electrode-scalp surface, quickly reducing the interface impedance. At this time, the valve body spring is in a compressed state. When the force of manually pressing the EEG electrode is cancelled, the valve body moves downward under the action of the valve body spring, and the fast-flow hole of the housing is sealed through the annular sealing gasket on the end face of the valve body, and the conductive liquid is transported to the slow-release probe through the slow-flow channel, and slowly released to the electrode-scalp surface, so as to maintain low interface impedance for a long time.

[0024] During the EEG test, conductive liquid is manually added, the plug of the EEG electrode is removed, and the conductive liquid is injected into the electrode through the injection hole of the valve body using a syringe. At this time, the conductive liquid flows through the injection hole of the valve body and the middle hole of the valve core to the slow-release probe, and the transmission path of the EEG signal is transmitted from the scalp to the electrode contact, while wetting the scalp tissue to reduce the interface impedance. The speed of interface impedance decrease is related to the supply of conductive liquid. When the supply is large, the impedance decreases quickly, and when the supply is small, the impedance decreases slowly. When the conductive liquid in the slow-release probe evaporates, the conductive liquid can continue to be replenished by manually adding conductive liquid.

[0025] The application of the technical solution of the present invention has the following technical effects:

[0026] By injecting conductive liquid, it can be made into a semi-dry electrode, and by injecting conductive paste, it can also be made into a wet electrode, which has good adaptability to scene applications.

[0027] Conductive liquid can be added manually or automatically through the delivery pipeline. For short-term simple tests, conductive liquid can be added manually; the conductive liquid delivery pipeline can realize synchronous and rapid liquid injection of multi-channel EEG electrodes, and the supply of conductive liquid can be adjusted in real time through impedance monitoring, which can not only realize the rapid wearing of EEG caps, but also realize the long-term continuous and effective collection of EEG signals. The conductive liquid filling method is flexible and can meet different test requirements.

[0028] It has the function of storing conductive liquid for a long time without releasing it when not in use, and can supply conductive liquid in two modes, fast or slow, to reduce the scalp-electrode impedance when wearing to collect signals. Fast supply of conductive liquid can quickly reduce impedance and improve test efficiency; slow release can ensure balanced and stable supply of conductive liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 A view showing a motor housing of an electroencephalographic sensing electrode according to the present invention is shown;

[0031] Figure 2 shows a cross-sectional view of the interior of an electrode housing of an EEG sensing electrode;

[0032] Figure 3 A first stereoscopic view of an electrode housing of an EEG sensing electrode is shown;

[0033] Figure 4 A second stereoscopic view of the electrode housing of the EEG sensing electrode is shown;

[0034] Figure 5 A view of the base structure of the EEG sensing electrode is shown;

[0035] Figure 6 A stereoscopic view of the base of the EEG sensing electrode is shown;

[0036] Figure 7 A top view of the EEG sensing electrodes is shown;

[0037] Figure 8 A stereoscopic view of the top cover of the EEG sensing electrodes is shown;

[0038] Fig. 9 A valve body view of an EEG sensing electrode is shown;

[0039] Fig.10 A front view of the valve body of the EEG sensing electrode is shown;

[0040] Fig.11 A three-dimensional view of the valve body showing the EEG sensing electrode;

[0041] Fig.12 A spool view of the EEG sensing electrodes is shown;

[0042] Fig.13 The overall structural view of the electrode housing assembly of the EEG sensing electrode is shown;

[0043] Fig.14 A stereoscopic diagram of the overall structure of the electrode housing assembly of the EEG sensing electrode is shown;

[0044] Fig.15 A cross-sectional view of the overall structure of the electrode housing assembly of the EEG sensing electrode is shown;

[0045] Fig.16 The overall structural view of the electrode housing assembly of the EEG sensing electrode is shown;

[0046] Fig.17 Shown is the overall structural view of the EEG sensing electrode.

[0047] The above drawings include the following reference numerals:

[0048] Liquid outlet channel 1; liquid storage chamber 2; liquid inlet channel 3; slow-flow hole 4; cable channel 5; inner hole annular boss 6; induction element groove 7; conical sealing hole 8; first rotating buckle locking structure 9; stepped groove 10; fast-flow hole 11; liquid guide groove 12; second rotating buckle locking structure 10; electrode shell 11; base 12; top cover 13; liquid injection hole 14; O-shaped circular groove 15; valve cavity 16; spring limit groove 17; sealing gasket groove 18; valve body 19; valve core 20; slow-release probe accommodating chamber 21; slow-release probe 22; boss sealing gasket 23; induction contact 24; O-ring 25; annular sealing gasket 26; valve body spring 27; clamp 28; water inlet pipe 29; water outlet pipe 30; capillary plug 31; plug 33. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] like Figures 1 to 17 As shown, an embodiment of the present invention provides an EEG sensing electrode, including: a shell component, the shell component includes a shell 11, a base 12 and a top cover 13, the shell 11 is connected to the base 12 to form a sustained-release probe 22 cavity, the shell 11 is connected to the top cover 13 to form a liquid storage cavity 2, and a fluid valve component, a sustained-release material, a capillary plug 31, a fast-flow hole 11 and a slow-flow hole 4 are arranged in the shell component; wherein, by injecting conductive liquid to make a semi-dry electrode or by injecting conductive paste to make a wet electrode, through the fluid valve component, the sustained-release material, the capillary plug 31, the fast-flow hole 11 and the slow-flow hole 4, the electrode can quickly supply liquid to reduce resistance and slowly supply liquid to reduce resistance between the electrode and the scalp, and the electrode-scalp interface impedance can be both quickly reduced and kept balanced and stable for a long time.

[0051] In this embodiment, an EEG sensing electrode includes a shell 11, a base 12, a top cover 13, a sensing contact 24, a slow-release probe 22, a valve body 19, a conical valve core 20, a plug 33, a capillary plug 31, a boss sealing gasket 23, an annular sealing gasket 26, an O-ring 25A, an O-ring 25B, an O-ring 25C, an inlet pipe 29, an outlet pipe 30, a valve core 20 spring, a valve body spring 27, and a clamp 28.

[0052] In this embodiment, the shell 11 is a cylinder with an internal stepped through hole, and the two ends are internally provided with a rotating buckle locking structure. One side of the annular boss in the middle of the inner hole of the shell 11 is a sensor groove 7, and the other side is a guide groove of the valve body 19. There is a conical sealing hole 8 between the sensor groove 7 and the guide groove of the valve body 19. A slow flow hole 4 and a fast flow hole 11 are arranged on the inner annular boss of the shell 11. The slow flow hole 4 connects the upper end face of the inner annular boss of the shell 11 with the conical surface of the conical sealing hole 8, and the fast flow hole 11 connects the bottom end face of the guide groove of the valve body 19 with the lower end face of the inner annular boss of the shell 11. A stepped groove 10 is arranged on the lower end face of the inner hole annular boss 6 of the shell 11. The outer wall of the shell 11 is provided with a liquid inlet channel 3, a liquid outlet channel 1 and a cable channel 5.

[0053] In this embodiment, the base 12 is an annular body with a bowl-shaped through hole inside, a locking boss and two annular bosses are arranged on the outer surface of the annular body, and an annular groove for fixing the electrode is formed between the two annular bosses.

[0054] In this embodiment, the top cover 13 is a stepped cylinder with a through hole in the middle, an O-ring groove is provided on the outer surface of the small cylinder, and an annular boss with four notches is provided on the outer surface of the large cylinder. A spring limiting groove 17 is provided on the bottom end surface of the top cover 13.

[0055] In this embodiment, the valve body 19 is a stepped cylinder with only a stepped through hole in the middle, a spring stopper groove 17 is arranged on the upper surface of the large cylinder, a sealing gasket groove 18 is arranged on the lower surface of the large cylinder, a liquid injection hole 14 is arranged on the upper surface of the small cylinder, and an O-ring groove is arranged on the outer surface of the small cylinder. The large hole inside the valve body 19 is a valve cavity 16, which is connected to the liquid injection hole 14. The valve core 20 is a cylinder with a built-in through hole and a conical boss on the outer surface, and an O-ring groove is arranged on the conical surface of the conical boss.

[0056] In this embodiment, the capillary plug 31 is a porous material in the shape of a cylinder, which can slowly penetrate the liquid. The capillary plug 31 can be made of porous ceramics, wood or high-density sponge, foaming material, porous metal and other materials that can slowly penetrate the liquid. The structural part can also be other structural forms other than the cylinder, and can also have built-in capillary channels. The boss seal 23 is a stepped ring seal.

[0057] In this embodiment, the induction contact 24 is a bioelectric sensing component that can collect and transmit electrical signals. The main body of the induction head is a circular ring structure, and an extension wire is arranged on the side.

[0058] In this embodiment, the slow-release probe 22 is an elastic cone with a circular groove on the upper end surface. The slow-release probe 22 has the function of storing liquid and slowly releasing liquid, and can be other infusion materials such as sponge and gel, which are required to have a certain elasticity. The slow-release probe 22 can be a conductive material, or it can become a conductor by storing a conductive medium itself.

[0059] In this embodiment, the shell assembly is formed by connecting the shell 11, the base 12, and the top cover 13. The shell 11 and the base 12 are connected by a rotating buckle locking structure to form a slow-release probe 22 cavity. The shell 11 and the top cover 13 are connected by a rotating buckle locking structure, and the rotating buckle locking structure includes a first rotating buckle locking structure 9 and a first rotating buckle locking structure 10; a liquid storage cavity 2 is formed, a liquid guide groove 12 is provided in the shell 11, and the main body of the induction contact 24 is placed in the induction member groove 7 of the shell 11. The wire of the induction contact 24 is fixed by a clamp 28 after passing through the cable channel 5 of the shell 11. One end of the water inlet pipe 29 and the water outlet pipe 30 are respectively placed in the liquid inlet channel 3 of the shell 11 and the liquid outlet channel 1 of the shell 11, and the other end is fixed by a clamp 28. The slow-release probe 22 is placed in the slow-release probe 22 cavity of the shell assembly. One end of the valve body 19 is placed in the valve body 19 guide groove of the housing 11, and is loosely matched with the housing 11. The other end of the valve body 19 is placed in the through hole of the top cover 13, and is loosely matched with the top cover 13. The valve body 19 is sealed by an O-ring A placed in the O-ring groove on the outer surface of the valve body 19. The top cover 13 and the housing 11 are sealed by an O-ring B placed in the O-ring groove on the outer surface of the top cover 13. The boss seal 23 is placed in the stepped groove 10 of the housing 11, and can form a seal at the contact between the housing 11 and the base 12. The plug 33 is placed in the injection hole 14 of the valve body 19. When injection is required, the plug 33 is removed, and the conductive liquid is injected into the electrode through a syringe or a capillary tube. The capillary plug 31 is placed in the slow flow hole 4 of the shell 11 in the shell assembly; the O-ring C is placed in the O-ring groove on the conical surface of the valve core 20, forming a seal between the valve core 20 and the surface of the conical sealing hole 8 of the shell 11, and can move with the valve core 20; the valve core 20 spring is sleeved on the outer surface of the valve core 20, one end is limited to the end face of the conical boss of the valve core 20, and the other end is limited to the bottom end face of the valve cavity 16 of the valve body 19. When the valve core 20 is forced to move upward, the sealing channel between the valve core 20 and the surface of the conical sealing hole 8 of the shell 11 is opened, and the conductive liquid in the liquid storage cavity 2 of the shell assembly enters the housing cavity of the slow release probe 22 of the shell assembly through the capillary plug 31 and the slow flow hole 4 and the conical sealing hole 8 of the shell 11, is absorbed by the slow release probe 22, and is slowly released to the electrode-scalp surface, thereby reducing the interface impedance. When the conductive liquid released to the electrode-scalp surface reaches a balance with the conductive liquid lost by volatilization, the interface impedance balance and stability can be maintained for a long time.

[0060] In this embodiment, the annular sealing gasket 26 is placed in the sealing groove of the valve body 19, and can move up and down with the valve body 19, and can block and open the fast flow hole 11 of the shell 11; the valve body spring 27 is sleeved on the outer surface of the valve body 19, one end is limited in the valve body spring 27 limit groove 17, and the other end is limited in the spring limit groove 17 on the bottom end face of the top cover 13. When the valve body 19 is forced to move upward, the fast flow hole 11 is opened, and the conductive liquid in the liquid storage cavity 2 can quickly flow to the slow-release probe 22 through the fast flow hole 11, and quickly released to the electrode-scalp surface, quickly reducing the interface impedance. At this time, the valve body spring 27 is in a compressed state. When the force is cancelled, under the action of the valve body spring 27, the valve body 19 moves downward, and the fast flow hole 11 of the shell 11 is sealed through the annular sealing gasket 26 on the end face of the valve body 19.

[0061] Working principle:

[0062] The base 12 is fixed to the electrode mounting holes at various points on the EEG cap body through the annular groove formed between the two annular bosses. The EEG cap body is combined with a plurality of EEG sensing electrodes to form an EEG cap that can collect EEG signals.

[0063] When the subject is not wearing the EEG cap, that is, the EEG sensing electrodes in the EEG cap are not in contact with the scalp, under the action of the valve core 20 spring, the valve core 20 is tightly fitted to the surface of the conical sealing hole 8 of the shell 11, and under the action of the O-ring C, the valve core 20 and the surface of the conical sealing hole 8 of the shell 11 are reliably sealed, and the conductive liquid in the liquid storage chamber 2 of the shell component cannot pass through the capillary plug 31 and the slow flow hole 4 through the conical sealing hole 8 of the shell 11 into the housing cavity of the slow-release probe 22 of the shell component, the slow-release probe 22 does not absorb the conductive liquid, and the conductive liquid cannot evaporate and lose through the slow-release probe 22. At this time, the conductive liquid is stored in the liquid storage chamber 2 of the shell component and can be preserved for a long time.

[0064] When the subject wears the EEG cap, the EEG sensing electrodes in the EEG cap are in contact with the scalp, squeezing the slow-release probe 22, pushing the valve core 20 upward, and opening the sealing channel between the valve core 20 and the surface of the conical sealing hole 8 of the shell 11. The conductive liquid in the liquid storage chamber 2 of the shell component enters the slow-release probe 22 chamber of the shell component through the capillary plug 31 and the slow-flow hole 4 through the conical sealing hole 8 of the shell 11, is absorbed by the slow-release probe 22, and is slowly released to the electrode-scalp surface, thereby opening the propagation path of the EEG signal from the scalp to the electrode contact, and at the same time moistening the scalp tissue to reduce the interface impedance. When the conductive liquid released to the electrode-scalp surface reaches a balance with the conductive liquid lost by evaporation, the interface impedance balance and stability can be maintained for a long time.

[0065] When the subject wears the EEG cap, the slow-release probe 22 slowly releases the conductive liquid to open the signal transmission path and reduce the interface impedance. Since the conductive liquid is released slowly, it takes a long time for the interface impedance to be reduced to the range allowed by the test. The impedance reduction process takes a long time and cannot meet the requirements of some tests that require rapid impedance reduction. At this time, the EEG electrode can be manually pressed to increase the contact force between the electrode and the scalp, increase the deformation of the slow-release probe 22, push the valve body 19 and the annular sealing gasket 26 upward, open the fast flow hole 11, and store liquid. The conductive liquid in the cavity 2 can quickly flow to the cavity of the slow-release probe 22 through the fast-flow hole 11, and be quickly released to the electrode-scalp surface, thereby quickly reducing the interface impedance. At this time, the valve body spring 27 is in a compressed state. When the force of manually pressing the EEG electrode is cancelled, the valve body 19 moves downward under the action of the valve body spring 27, and the fast-flow hole 11 of the shell 11 is sealed by the annular sealing gasket 26 on the end face of the valve body 19. At this time, the conductive liquid is transported to the slow-release probe 22 only by the slow-flow holes 4, and is slowly released to the electrode-scalp surface, thereby maintaining low interface impedance for a long time.

[0066] During the EEG test, the conductive liquid can be manually added, the plug 33 of the EEG electrode is removed, and the conductive liquid is injected into the electrode through the injection hole 14 of the valve body 19 using a syringe. At this time, the conductive liquid flows through the injection hole 14 of the valve body 19 and the middle hole of the valve core 20 to the slow-release probe 22, and the transmission path of the EEG signal is transmitted from the scalp to the electrode contact, while wetting the scalp tissue and reducing the interface impedance. The interface impedance decrease speed is related to the supply of conductive liquid. When the supply is large, the impedance decreases quickly, and when the supply is small, the impedance decreases slowly. When the conductive liquid in the slow-release probe 22 evaporates, the conductive liquid can continue to be replenished by manually adding conductive liquid.

[0067] When monitoring EEG signals for a long time, the conductive liquid can be automatically added through the water inlet pipe 29, and the conductive liquid is automatically transported to the liquid storage chamber 2 of the shell component through the water inlet pipe 29, and then transported to the slow-release probe 22 through the slow-flow hole 4 or the fast-flow hole 11. When the liquid in the liquid storage chamber 2 of the shell component is filled, the excess conductive liquid is discharged to the external fluid system through the water outlet pipe 30. The content of the conductive liquid in the liquid storage chamber 2 of the shell component can be inferred by real-time detection of the interface impedance between the electrode and the scalp. When the conductive liquid is insufficient, the conductive liquid is automatically transported to the liquid storage chamber 2 through the external fluid system. The combination of real-time impedance monitoring and automatic liquid replenishment can maintain the low impedance state of the interface for a long time, and realize the long-term collection of EEG signals.

[0068] The described EEG sensing electrode and its application method can be used as a semi-dry electrode or a wet electrode. When used as a wet electrode, the plug 33 of the electrode is removed, and a syringe is used to inject conductive paste into the interior of the electrode through the injection hole 14 of the valve body 19, and the conductive paste is injected into the cavity of the sustained-release probe 22 of the shell component. The conductive paste is used to form a coupling channel between the scalp and the electrode contact. At this time, the EEG signal can be transmitted from the scalp to the sensing contact 24 using the conductive paste, and then transmitted to the back-end amplification and collection system via the wire.

[0069] Another embodiment of the present invention provides a method for using an electroencephalogram sensor electrode, comprising:

[0070] The base 12 is fixed to the electrode mounting holes at various points on the EEG cap body through the annular groove formed between the two annular bosses. The EEG cap body is combined with a plurality of EEG sensing electrodes to form an EEG cap that can collect EEG signals:

[0071] When the subject does not wear the EEG cap, that is, the EEG sensing electrodes in the EEG cap are not in contact with the scalp, under the action of the valve core 20 spring, the valve core 20 is tightly fitted to the surface of the conical sealing hole 8 of the shell 11, and under the action of the O-ring C, the valve core 20 and the surface of the conical sealing hole 8 of the shell 11 are reliably sealed, and the conductive liquid in the liquid storage cavity 2 of the shell component cannot enter the housing cavity of the slow-release probe 22 of the shell component through the capillary plug 31 and the slow-flow hole 4 through the conical sealing hole 8 of the shell 11, and the slow-release probe 22 does not absorb the conductive liquid, and the conductive liquid cannot volatilize and lose through the slow-release probe 22. At this time, the conductive liquid is stored in the liquid storage cavity 2 of the shell component;

[0072] When the subject wears the EEG cap, the EEG sensing electrode in the EEG cap contacts the scalp, squeezing the slow-release probe 22, pushing the valve core 20 upward, and the sealing channel between the valve core 20 and the surface of the conical sealing hole 8 of the shell 11 is opened. The conductive liquid in the liquid storage chamber 2 of the shell component enters the slow-release probe 22 chamber of the shell component through the capillary plug 31 and the slow-flow hole 4 through the conical sealing hole 8 of the shell 11, is absorbed by the slow-release probe 22, and is slowly released to the electrode-scalp surface, thus opening the propagation path of the EEG signal from the scalp to the electrode contact, and at the same time moistening the scalp tissue to reduce the interface impedance. When the conductive liquid released to the electrode-scalp surface reaches a balance with the conductive liquid lost by evaporation, the interface impedance balance and stability can be maintained for a long time.

[0073] When the subject wears the EEG cap, the slow-release probe 22 slowly releases the conductive liquid to open the signal transmission path and reduce the interface impedance. The conductive liquid is released slowly, and the interface impedance needs a long time to be reduced to the range allowed by the test. The impedance reduction process takes a long time and cannot meet the requirements of some tests that require rapid impedance reduction. At this time, the EEG electrode can be manually pressed to increase the contact force between the electrode and the scalp, increase the deformation of the slow-release probe 22, push the valve body 19 and the annular sealing gasket 26 upward, open the fast flow hole 11, and the liquid storage chamber 2 The conductive liquid in the body can quickly flow to the chamber of the slow-release probe 22 through the fast-flow hole 11, and quickly released to the electrode-scalp surface, quickly reducing the interface impedance. At this time, the valve body spring 27 is in a compressed state. When the force of manually pressing the EEG electrode is cancelled, the valve body 19 moves downward under the action of the valve body spring 27, and the fast-flow hole 11 of the housing 11 is sealed by the annular sealing gasket 26 on the end face of the valve body 19. At this time, the conductive liquid is transported to the slow-release probe 22 only by the slow-flow hole 4, and slowly released to the electrode-scalp surface, so as to maintain low interface impedance for a long time;

[0074] During the EEG test, conductive liquid is manually added, the plug 33 of the EEG electrode is removed, and the conductive liquid is injected into the electrode through the injection hole 14 of the valve body 19 using a syringe. At this time, the conductive liquid flows through the injection hole 14 of the valve body 19 and the middle hole of the valve core 20 to the slow-release probe 22, and the transmission path of the EEG signal is transmitted from the scalp to the electrode contact, while wetting the scalp tissue and reducing the interface impedance; the interface impedance decrease speed is related to the supply of conductive liquid. When the supply is large, the impedance decreases quickly, and when the supply is small, the impedance decreases slowly; when the conductive liquid in the slow-release probe 22 evaporates, the conductive liquid can continue to be replenished by manually adding conductive liquid.

[0075] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0076] By injecting conductive liquid, it can be made into a semi-dry electrode, and by injecting conductive paste, it can also be made into a wet electrode, which has good adaptability to scene applications.

[0077] Conductive liquid can be added manually or automatically through the delivery pipeline. For short-term simple tests, conductive liquid can be added manually; the conductive liquid delivery pipeline can realize synchronous and rapid liquid injection of multi-channel EEG electrodes, and the supply of conductive liquid can be adjusted in real time through impedance monitoring, which can not only realize the rapid wearing of EEG caps, but also realize the long-term continuous and effective collection of EEG signals. The conductive liquid filling method is flexible and can meet different test requirements.

[0078] It has the function of storing conductive liquid for a long time without releasing it when not in use, and can supply conductive liquid in two modes, fast or slow, to reduce the scalp-electrode impedance when wearing to collect signals. Fast supply of conductive liquid can quickly reduce impedance and improve test efficiency; slow release can ensure balanced and stable supply of conductive liquid.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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. An electroencephalogram sensing electrode, characterized in that: include: The housing assembly comprises a housing, a base and a top cover, the housing is connected to the base to form a slow-release probe cavity, the housing is connected to the top cover to form a liquid storage cavity, and the housing assembly is provided with a fluid valve, a slow-release material, a capillary plug, a fast-flow hole and a slow-flow hole; Among them, by injecting conductive liquid to make a semi-dry electrode or injecting conductive paste to make a wet electrode, the electrode can quickly supply liquid to reduce resistance or slowly supply liquid to reduce resistance between the electrode and the scalp through fluid valves, sustained-release materials, capillary plugs, fast-flow holes and slow-flow holes. The electrode-scalp interface impedance can be reduced quickly and maintained in a balanced and stable state for a long time.

2. The electroencephalogram sensing electrode according to claim 1, characterized in that: The shell is a cylinder with a stepped through hole inside, and the two ends of the shell are internally provided with a rotating snap-on locking structure. One side of the middle annular boss of the inner hole of the shell is a sensing component groove, and the other side is a valve body guide groove. A conical sealing hole is provided between the sensing component groove and the valve body guide groove. A slow flow hole and a fast flow hole are provided on the inner annular boss of the shell. The slow flow hole connects the upper end face of the inner annular boss of the shell with the conical surface of the conical sealing hole, and the fast flow hole connects the bottom end face of the valve body guide groove with the lower end face of the inner annular boss of the shell.

3. The electroencephalogram sensing electrode according to claim 1, characterized in that: A stepped groove is arranged on the lower end surface of the annular boss of the inner hole of the shell, and a liquid inlet channel, a liquid outlet channel and a cable channel are arranged on the outer coin of the shell.

4. The electroencephalogram sensing electrode according to claim 1, characterized in that: The base is an annular body with a bowl-shaped through hole inside, and a locking boss and two annular bosses are arranged on the outer surface of the annular body, and an annular groove for fixing the electrode is formed between the two annular bosses.

5. The electroencephalogram sensing electrode according to claim 1, characterized in that: The top cover is a stepped cylinder with a through hole in the middle, an O-ring groove is arranged on the outer surface of the small cylinder, an annular boss with four notches is arranged on the outer surface of the large cylinder, and a spring limiting groove is arranged on the bottom end surface of the top cover.

6. The electroencephalogram sensing electrode according to claim 1, characterized in that: The fluid valve component includes a valve body and a valve core. The valve body is a stepped cylinder with a stepped through hole in the middle, wherein a spring limit groove is provided on the upper surface of the cylinder with a large diameter, a sealing gasket groove is provided on the lower surface of the cylinder with a large diameter, an injection hole is provided on the upper surface of the cylinder with a small diameter, and an O-ring groove is provided on the outer surface of the cylinder with a small diameter. The large hole inside the valve body is a valve cavity, which is connected to the injection hole; the valve core is a cylinder with a built-in through hole and a conical boss on the outer surface, and an O-shaped circular groove is provided on the surface of the conical boss.

7. The electroencephalogram sensing electrode according to claim 1, characterized in that: It also includes a sensing contact and a slow-release probe, wherein the sensing contact body is placed in the sensing member slot of the shell, the sensing contact wire is fixed with a clamp after passing through the cable channel of the shell, the sensing contact is a bioelectric sensing component, the head body of the sensing probe is a circular ring structure, an extension wire is provided on the side of the circular ring structure, and the sensing probe is used to collect and transmit electrical signals; the slow-release probe is placed in the slow-release probe cavity of the shell assembly, the slow-release probe is an elastic cone, and a circular groove is provided on the upper end face of the slow-release probe.

8. The electroencephalogram sensing electrode according to claim 1, characterized in that: The capillary plug is placed in the slow-flow hole of the shell in the shell component; the O-ring C is placed in the O-ring groove on the conical surface of the valve core, forming a seal between the valve core and the surface of the conical sealing hole of the shell, and can move with the valve core; the valve core spring is sleeved on the outer surface of the valve core, one end of which is limited to the end face of the conical boss of the valve core, and the other end is limited to the bottom end face of the valve cavity of the valve body. When the valve core is forced to move upward, the sealing channel between the valve core and the surface of the conical sealing hole of the shell is opened, and the conductive liquid in the liquid storage cavity of the shell component enters the slow-release probe cavity of the shell component through the capillary plug and the slow-flow hole and the conical sealing hole of the shell, is absorbed by the slow-release probe, and is slowly released to the electrode-scalp surface, thereby reducing the interface impedance. When the conductive liquid released to the electrode-scalp surface reaches a balance with the conductive liquid lost by volatilization, the interface impedance balance and stability can be maintained for a long time.

9. The electroencephalogram sensing electrode according to claim 1, characterized in that: The annular sealing gasket is placed in the valve body sealing groove and can move up and down with the valve body to block and open the shell's fast flow hole; the valve body spring is sleeved on the outer surface of the valve body, one end is limited in the valve body spring limit groove, and the other end is limited in the spring limit groove on the bottom end face of the top cover. When the valve body is forced to move upward, the fast flow hole opens, and the conductive liquid in the liquid storage cavity can quickly flow to the slow-release probe cavity through the fast flow hole, and is quickly released to the electrode-scalp surface, quickly reducing the interface impedance; at this time, the valve body spring is in a compressed state. When the force is cancelled, the valve body moves downward under the action of the valve body spring, and the shell's fast flow hole is sealed through the annular sealing gasket on the end face of the valve body.

10. A method for using an electroencephalogram sensor electrode, based on the electroencephalogram sensor electrode according to any one of claims 1 to 9, characterized in that: include: Through the annular groove formed between the two annular bosses of the base, it is fixed in the electrode mounting holes at various points on the EEG cap body. The EEG cap body is combined with multiple EEG sensing electrodes to form an EEG cap that can collect EEG signals: When the subject does not wear the EEG cap, that is, the EEG sensing electrodes in the EEG cap are not in contact with the scalp, under the action of the valve core spring, the valve core is tightly fitted to the surface of the conical sealing hole of the shell, and under the action of the O-ring C, the valve core and the surface of the conical sealing hole of the shell are reliably sealed, and the conductive liquid in the liquid storage cavity of the shell component cannot enter the slow-release probe cavity of the shell component through the capillary plug and the slow-flow hole through the conical sealing hole of the shell, and the slow-release probe does not absorb the conductive liquid, and the conductive liquid cannot be volatilized and lost through the slow-release probe. At this time, the conductive liquid is stored in the liquid storage cavity of the shell component; When the subject wears the EEG cap, the EEG sensing electrode in the EEG cap contacts the scalp, squeezing the slow-release probe, pushing the valve core upward, and the sealing channel between the valve core and the surface of the conical sealing hole of the shell is opened. The conductive liquid in the liquid storage cavity of the shell component enters the slow-release probe cavity of the shell component through the capillary plug and the slow-flow hole through the conical sealing hole of the shell, is absorbed by the slow-release probe, and is slowly released to the electrode-scalp surface, thus opening the propagation path of the EEG signal from the scalp to the electrode contact, and at the same time moistening the scalp tissue to reduce the interface impedance. When the conductive liquid released to the electrode-scalp surface reaches a balance with the conductive liquid lost by evaporation, the interface impedance balance and stability can be maintained for a long time. When the subject wears the EEG cap, the slow-release probe slowly releases the conductive liquid to open the signal transmission path and reduce the interface impedance. The conductive liquid is released slowly, and it takes a long time for the interface impedance to be reduced to the range allowed by the test. The impedance reduction process takes a long time and cannot meet the requirements of rapid impedance reduction for some tests. At this time, the EEG electrode can be pressed manually to increase the contact force between the electrode and the scalp, increase the deformation of the slow-release probe, push the valve body and the annular sealing gasket upward, open the fast-flow hole, and the conductive liquid in the liquid storage cavity can flow quickly to the slow-release probe cavity through the fast-flow hole, and be quickly released to the electrode-scalp surface, quickly reducing the interface impedance. At this time, the valve body spring is in a compressed state. When the force of manually pressing the EEG electrode is cancelled, the valve body moves downward under the action of the valve body spring, and the fast-flow hole of the housing is sealed through the annular sealing gasket on the end face of the valve body, and the conductive liquid is transported to the slow-release probe through the slow-flow channel, and slowly released to the electrode-scalp surface, so as to maintain low interface impedance for a long time. During the EEG test, conductive liquid is manually added, the plug of the EEG electrode is removed, and the conductive liquid is injected into the electrode through the injection hole of the valve body using a syringe. At this time, the conductive liquid flows through the injection hole of the valve body and the middle hole of the valve core to the slow-release probe, and the transmission path of the EEG signal is transmitted from the scalp to the electrode contact, while wetting the scalp tissue to reduce the interface impedance. The speed of interface impedance decrease is related to the supply of conductive liquid. When the supply is large, the impedance decreases quickly, and when the supply is small, the impedance decreases slowly. When the conductive liquid in the slow-release probe evaporates, the conductive liquid can continue to be replenished by manually adding conductive liquid.

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