CN113456080A - Dry-wet universal sensing electrode and application method thereof - Google Patents
Dry-wet universal sensing electrode and application method thereof Download PDFInfo
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- CN113456080A CN113456080A CN202110575177.4A CN202110575177A CN113456080A CN 113456080 A CN113456080 A CN 113456080A CN 202110575177 A CN202110575177 A CN 202110575177A CN 113456080 A CN113456080 A CN 113456080A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 198
- 210000004761 scalp Anatomy 0.000 claims abstract description 69
- 230000001105 regulatory effect Effects 0.000 claims abstract description 47
- 230000006698 induction Effects 0.000 claims abstract description 32
- 230000001276 controlling effect Effects 0.000 claims abstract description 12
- 230000001939 inductive effect Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 230000003321 amplification Effects 0.000 description 4
- 210000004556 brain Anatomy 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 210000003710 cerebral cortex Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 210000003491 skin Anatomy 0.000 description 1
- 210000000434 stratum corneum Anatomy 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/291—Bioelectric electrodes therefor specially adapted for particular uses for electroencephalography [EEG]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/369—Electroencephalography [EEG]
- A61B5/386—Accessories or supplementary instruments therefor
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Abstract
The invention discloses a dry-wet universal sensing electrode and an application method thereof, wherein the sensing electrode comprises a shell, a sensing contact, a liquid storage tank, a speed regulating valve and a regulating structure, wherein the liquid storage tank and the sensing contact are arranged in the shell from top to bottom; the end face of the induction contact is detachably provided with a flexible contact which is in contact with the scalp, a liquid guide channel is arranged in the induction contact, and the conductive liquid can be conveyed to the end face of the induction contact through the liquid guide channel; a speed regulating valve is arranged in the liquid guide channel, and the supply quantity and the supply speed of the conductive liquid conveyed to the end surface of the induction contact are regulated and controlled by controlling the opening of the speed regulating valve; the fitting degree between the sensing electrode and the scalp is adjusted through the adjusting structure. The dry and wet universal sensing electrode can be used as a dry electrode, a semi-dry electrode and a wet electrode, and can meet different application scenes and requirements.
Description
Technical Field
The invention relates to the technical field of brain-computer interfaces, in particular to a dry-wet universal sensing electrode and an application method thereof.
Background
The brain-computer interface technology is that brain electrical signals are collected from cerebral cortex through signal collecting equipment, and are converted into signals which can be recognized by a computer through amplification, filtering, A/D conversion and other processing, then the signals are preprocessed, characteristic signals are extracted, mode recognition is carried out by the characteristic signals, and finally the signals are converted into specific instructions for controlling external equipment, so that the control of the external equipment is realized. The brain electricity sensing electrode is used as the most front end and the most basic induction part of brain-computer interface technology, and the performance of the brain electricity sensing electrode has decisive influence on the quality of the collected brain electricity signals.
At present, noninvasive electrodes applied to scalp electroencephalogram acquisition mainly comprise dry electrodes, wet electrodes and semi-dry electrodes. The dry electrode is convenient to use, does not need excessive preparation work, is influenced by the high-impedance stratum corneum on the surface of the scalp, has overhigh interface impedance, low signal-to-noise ratio and poor stability, and is generally applied to occasions with low electroencephalogram signal quality; the wet electrode has relatively good signal quality, but the preparation work is time-consuming and tedious, the conductive medium is easy to dry, the effective acquisition time is short, the cleaning is needed after the experiment, the user experience is poor, and the wet electrode is relatively suitable for the laboratory environment; the signal quality of the semi-dry electrode is theoretically between that of the dry electrode and that of the wet electrode, but the supply amount of the interface conductive liquid is unstable, when the liquid supply is insufficient, the impedance is too large, and when the liquid supply is too much, signal crosstalk between multi-channel electrodes can be caused. In addition, at present, the electroencephalogram acquisition equipment adopts a single type of electrode, the adaptability to a scene without application is poor, certain limitation exists, the existing electroencephalogram sensing electrode is poor in surface fitting performance on the arc scalp, the contact force is not adjustable, and the signal acquisition quality and the wearing comfort of people are affected.
Disclosure of Invention
In view of the problems in the prior art, an object of the present invention is to provide a dry-wet universal sensing electrode that can be used as a dry electrode, a wet electrode, and a semi-dry electrode, can be applied to different application scenarios, and can adjust the adhesion between the sensing electrode and the scalp surface to effectively control the supply amount of interface conductive liquid.
The second purpose of the invention is to provide an application method of the sensing electrode as a dry electrode.
The third purpose of the invention is to provide an application method of the sensing electrode as a semi-dry electrode.
The fourth purpose of the invention is to provide an application method of the sensing electrode as a wet electrode.
In order to achieve the above object, a first aspect of the present invention provides a wet and dry universal sensing electrode, which includes a housing, a sensing contact, a liquid storage tank, a speed regulating valve and an adjusting structure, wherein the liquid storage tank and the sensing contact are disposed in the housing from top to bottom; the liquid storage tank is provided with a liquid feeding port and a liquid discharging port, conductive liquid is added into the liquid storage tank through the liquid feeding port, and the conductive liquid in the liquid storage tank can flow into the induction contact from the liquid discharging port; the end face of the induction contact is detachably provided with a flexible contact which is in contact with the scalp, a liquid guide channel is arranged in the induction contact and is respectively communicated with the liquid discharge port and the end face of the induction contact, and the conductive liquid flowing out of the liquid discharge port can be conveyed to the end face of the induction contact through the liquid guide channel; the liquid guide channel is internally provided with the speed regulating valve, and the supply amount and the supply speed of the conductive liquid conveyed to the end surface of the induction contact are regulated and controlled by controlling the opening of the speed regulating valve; the adjusting structure is connected with the shell and comprises a swing support and a rotary joint, and the fitting degree between the sensing electrode and the scalp is adjusted through the swing support and the rotary joint
Furthermore, a spiral groove is arranged on the end face of the induction contact, the shape of the flexible contact is a spiral shape corresponding to the shape of the spiral groove, the flexible contact is detachably arranged in the spiral groove, and a central groove position of the spiral groove corresponds to an outlet of the liquid guide channel.
Further, the speed regulating valve comprises a valve seat and a valve core, the valve seat and the valve core are arranged in the liquid guide channel from top to bottom, a first channel communicated with the liquid guide channel is arranged in the valve seat, a second channel communicated with the liquid guide channel is arranged in the valve core, and the conductive liquid flowing into the liquid guide channel from the liquid storage tank is conveyed to the end face of the induction contact through the first channel and the second channel in sequence; the valve seat is seated on the valve core to seal the outlet of the first channel, the valve core is in threaded connection with the liquid guide channel, and the opening degree of the outlet of the first channel is regulated and controlled by adjusting the length of the valve core screwed into or out of the liquid guide channel so as to control the opening degree of the speed regulating valve.
Further, the speed regulating valve comprises a valve seat and a valve core, the valve seat and the valve core are arranged in the liquid guide channel from top to bottom, a first channel communicated with the liquid guide channel is arranged in the valve seat, a second channel communicated with the liquid guide channel is arranged in the valve core, a nano-catheter is arranged in the second channel, and the conductive liquid flowing into the liquid guide channel from the liquid storage tank is conveyed to the end face of the induction contact through the first channel and the nano-catheter in sequence; and controlling the opening of the speed regulating valve by selecting the nano-conduits with different apertures.
Further, the valve seat and the periphery of the valve core are respectively provided with a sealing groove, and a sealing ring is arranged in the sealing groove.
Further, the swing support comprises an inner ring support and an outer ring support, the inner ring support is provided with a threaded through hole, one side of the outer ring support is provided with a circular support, the end part of the circular support is provided with a linear opening, the other side of the circular support is provided with a rotation limiting boss, and the inner ring support and the outer ring support are connected through a protruding shaft on the inner ring support; the rotary joint is a cylinder with a built-in step hole, a rotary limiting groove is arranged at one section of the rotary joint, the circular support is arranged in the step hole of the rotary joint, and the rotary limiting boss of the swing support and the rotary limiting groove of the rotary joint are matched with each other to realize the limitation of the rotating angle.
Further, the top of the liquid storage tank is provided with the liquid adding opening, the bottom of the liquid storage tank is provided with a liquid outlet needle head, two ends of the liquid outlet needle head are respectively communicated with the liquid outlet and the liquid guide channel, and the outer diameter of the liquid outlet needle head is smaller than that of the liquid guide channel and stretches into the liquid guide channel.
The second aspect of the present invention provides a method for applying the above sensing electrode as a dry electrode, comprising the following steps:
1) placing the sensing electrode on the surface of the scalp;
2) the length of the sensing electrode is adjusted by adjusting the screwing length of the shell and the adjusting structure, so that the contact force between the sensing electrode and the scalp is adjusted;
3) the adjustment structure is used for adjusting the swing of the sensing electrode in the left-right direction and the up-down direction so as to adjust the fitting degree of the sensing electrode and the scalp curved surface;
4) and collecting electroencephalogram signals through the sensing electrode after the sensing electrode is closely attached to the scalp.
The third aspect of the present invention provides an application method of the above sensing electrode as a semi-dry electrode, comprising the following steps:
1) adjusting the opening degree of the speed regulating valve to a preset opening degree;
2) placing the sensing electrode on the surface of the scalp;
3) the length of the sensing electrode is adjusted by adjusting the screwing length of the shell and the adjusting structure, so that the contact force between the sensing electrode and the scalp is adjusted;
4) the adjustment structure is used for adjusting the swing of the sensing electrode in the left-right direction and the up-down direction so as to adjust the fitting degree of the sensing electrode and the scalp curved surface;
5) filling conductive liquid into the liquid storage tank and accurately controlling the supply amount of the conductive liquid between the sensing electrode and the surface of the scalp through the opening of the speed regulating valve;
6) and collecting electroencephalogram signals through the sensing electrode after the sensing electrode and the surface of the scalp are soaked by the conductive liquid.
The invention provides a method for applying the sensing electrode as a wet electrode, which comprises the following steps:
1) removing the flexible contact from the inductive contact;
2) injecting conductive paste on the end face of the induction contact;
3) placing the sensing electrode on the surface of the scalp;
4) the length of the sensing electrode is adjusted by adjusting the screwing length of the shell and the adjusting structure, so that the contact force between the sensing electrode and the scalp is adjusted;
5) the adjustment structure is used for adjusting the swing of the sensing electrode in the left-right direction and the up-down direction so as to adjust the fitting degree of the sensing electrode and the scalp curved surface;
6) and collecting electroencephalogram signals through the sensing electrode after the sensing electrode is closely attached to the scalp.
The dry-wet universal sensing electrode can be used as a dry electrode, conductive liquid can be conveyed between the sensing electrode and the scalp through the liquid storage tank and the liquid guide channel to be used as a semi-dry electrode, the flexible contact on the sensing contact can be detached, and conductive paste is injected into the end face of the sensing contact to be used as a wet electrode, so that different application scenes and requirements can be met.
In addition, a speed regulating valve capable of accurately controlling the supply amount of the conductive liquid between the sensing electrode and the scalp is arranged in the liquid guide channel of the sensing contact, so that the supply amount of the conductive liquid between the sensing electrode and the scalp interface is stable, and the problems of signal crosstalk and the like between multi-channel electrodes possibly caused by over-supply of the conductive liquid and over-high impedance when the supply amount of the conductive liquid is insufficient are avoided.
And thirdly, the sensing electrode can be adjusted in three degrees of freedom through the adjusting structure, so that the sensing electrode is ensured to be in full and stable physical contact with the scalp interface and is comfortable to wear.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is an external view of a wet-dry universal sensing electrode according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an internal structure of a wet-dry sensing electrode according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a speed regulating valve of a dry-wet universal sensing electrode according to an embodiment of the present invention;
FIG. 4 is an external view of the housing and adjustment structure of the wet and dry sensing electrode according to one embodiment of the present invention;
FIG. 5 is a schematic diagram of the internal structure of the housing and the adjustment structure of the wet and dry sensing electrode according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a sensing contact structure of a dry-wet universal sensing electrode according to an embodiment of the present invention;
FIG. 7 is a flow chart of a method for applying a wet and dry universal sensing electrode according to one embodiment of the present invention;
FIG. 8 is a flow chart of a method of applying a wet and dry universal sensing electrode according to one embodiment of the present invention;
fig. 9 is a flowchart of a method for applying a wet-dry sensing electrode according to an embodiment of the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the term "connected" is to be understood broadly, and may be, for example, fixed, detachable, or integrally connected, and may be mechanically or electrically connected, and may be directly or indirectly connected through an intermediate medium, unless otherwise specifically stated or limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "top," "bottom," "above … …," "below," and "above … …," "left-right direction," "up-down direction" as used throughout the description are relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are multifunctional, regardless of their orientation in space.
The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying a number of the indicated technical features. Thus, a defined feature of "first", "second", may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the wet and dry universal sensing electrode of the present invention comprises a housing 1, a sensing contact 2, a liquid storage tank 3, a speed regulating valve 4 and a regulating structure 5, wherein the liquid storage tank 3 and the sensing contact 2 are arranged in the housing 1 from top to bottom; the liquid storage tank 3 is provided with a liquid adding port 31 and a liquid discharging port 32, conductive liquid is added into the liquid storage tank 3 through the liquid adding port 31, and the conductive liquid in the liquid storage tank 3 can flow into the induction contact 2 from the liquid discharging port 32. A flexible contact 6 which is contacted with the scalp is detachably arranged on the end surface of the induction contact 2, a liquid guide channel 21 is arranged in the induction contact 2, the liquid guide channel 21 is respectively communicated with the liquid discharge port 32 and the end surface of the induction contact 2, and the conductive liquid flowing out of the liquid discharge port 32 can be conveyed to the end surface of the induction contact 2 through the liquid guide channel 21; the speed regulating valve 4 is arranged in the liquid guide channel 21, and the supply amount and the supply speed of the conductive liquid conveyed to the end face of the induction contact 2 are regulated and controlled by controlling the opening degree of the speed regulating valve 4; the adjusting structure 5 is connected with the shell 1, the adjusting structure 5 comprises a swing support 51 and a rotary joint 52, the swing support and the rotary joint can drive the sensing electrode to swing in two degrees of freedom in the up-down direction and the left-right direction, and the shell 1 can move in the vertical direction to control the length of the sensing electrode.
The sensing electrode can be used as a dry electrode without injecting the conductive liquid and the conductive paste, the sensing electrode can be used as a semi-dry electrode by injecting the conductive liquid into the interface between the sensing electrode and the scalp, and the sensing electrode can be used as a wet electrode by injecting the conductive paste into the interface between the sensing electrode and the scalp, so that different application scenes and requirements can be met. In addition, a liquid storage tank for storing the conductive liquid is arranged in the shell of the sensing electrode, and a certain amount of conductive liquid is stored in the liquid storage tank, so that the stability of the supply speed of the conductive liquid can be ensured, and the accurate control of the supply amount of the subsequent conductive liquid is facilitated. And the supply quantity and the supply speed of the conductive liquid conveyed to the end face of the induction contact can be accurately controlled by controlling the opening of the speed regulating valve, so that the supply quantity of the conductive liquid on the interface between the sensing electrode and the scalp is stable, and the problems of signal crosstalk and the like between multi-channel electrodes possibly caused by overlarge liquid supply and overlarge liquid supply when the liquid supply of the conductive liquid is insufficient are avoided. The sensing electrode can be adjusted in three degrees of freedom through the adjusting structure, so that the sensing electrode is ensured to be in full and stable physical contact with a scalp interface and is comfortable to wear. The flexible contacts on the end faces of the sensing contacts can be removed from the sensing contacts so that conductive paste can be injected on the end faces of the sensing contacts.
In an embodiment of the present invention, a spiral groove 22 is disposed on an end surface of the sensing contact 2, the flexible contact 6 is in a spiral shape corresponding to the spiral groove 22, the flexible contact 6 is detachably disposed in the spiral groove 22, a central slot of the spiral groove 22 corresponds to an outlet of the liquid guiding channel 21, and the conductive liquid flowing out from the outlet of the liquid guiding channel 21 may first fall into the central slot of the spiral groove 22, and then flow into each position of the spiral groove along the spiral groove 22. The spiral groove is arranged on the end face of the sensing contact, so that the conductive liquid can be uniformly injected into the interface between the sensing electrode and the scalp, the supply quantity of the conductive liquid at each position where the sensing electrode is contacted with the scalp is balanced, and the problems of insufficient liquid supply, excessive liquid supply and the like of local parts are avoided. In addition, the spiral groove is formed in the end face of the induction contact, so that the flexible contact can be directly clamped in the spiral groove conveniently, the flexible contact is convenient to mount and dismount, and meanwhile, conductive paste is convenient to inject.
In an embodiment of the present invention, the liquid filling port 31 is disposed at the top of the liquid storage tank 3, the liquid outlet needle 33 is disposed at the bottom of the liquid storage tank 3, two ends of the liquid outlet needle 33 are respectively communicated with the liquid discharge port 32 and the liquid guiding channel 21, and the outer diameter of the liquid outlet needle 33 is smaller than the outer diameter of the liquid guiding channel 21 and extends into the liquid guiding channel 21. The liquid outlet needle head which extends into the liquid guide channel is arranged at the bottom of the liquid storage tank, so that the conductive liquid in the liquid storage tank can be conveyed into the liquid guide channel more conveniently. In addition, a plug 34 can be installed on the filling opening 31 to prevent the conductive liquid in the liquid storage tank from spilling out of the filling opening. The cover plate can be installed on the shell 1 through screw threads to protect the liquid storage tank 3 in the shell 1.
In an embodiment of the present invention, as shown in fig. 3, the speed regulating valve 4 includes a valve seat 41 and a valve core 42, the valve seat 41 and the valve core 42 are disposed in the liquid guiding channel 21 from top to bottom, a first channel 411 communicated with the liquid guiding channel 21 is disposed in the valve seat 41, a second channel 421 communicated with the liquid guiding channel 21 is disposed in the valve core 42, a nano-tube 45 is disposed in the second channel 421, and the conductive liquid flowing into the liquid guiding channel from the liquid storage tank 3 is sequentially conveyed to the end surface of the inductive contact 2 through the first channel 411 and the nano-tube 45; the opening degree of the speed regulating valve 4 is controlled by selecting the nano-conduits 45 with different pore diameters. In addition, in this embodiment, the nano-tube 45 in the second channel 421 may also be removed, the valve seat 41 is seated on the valve element 42 to close the outlet of the first channel 411, the valve element 42 is in threaded connection with the liquid guiding channel 21, and the opening degree of the outlet of the first channel 411 is regulated and controlled by adjusting the length of the valve element 42 screwed into or out of the liquid guiding channel 21, so as to control the opening degree of the speed regulating valve 4. Therefore, the opening degree of the speed regulating valve 4 can be adjusted by adjusting the screwing-in or screwing-out length of the valve core or controlled by selecting nano-conduits with different pore diameters. In addition, the valve seat 41 of the speed regulating valve 4 is a cylinder with a built-in conical through hole, a sealing ring groove is arranged on the outer surface of the cylinder, the valve core 42 is a stepped cylinder, a thread is arranged on the outer surface of the large cylinder, a conduit hole and a cross groove are arranged on the end surface of the large cylinder, a sealing ring groove is arranged on the outer surface of the small cylinder, the position close to the end surface is conical, the conical surface can facilitate the conductive liquid to flow to a next stage, and a cross guide rail is arranged on the end surface of the small cylinder; the liquid flow channel on the conical surface of the valve core 42 is communicated with the inside of the guide pipe hole; the nanometer conduit 45 is a cylinder with a built-in capillary through hole and is arranged in a conduit hole of the valve core 42; the seal rings 43 and 44 are respectively arranged in the seal ring grooves of the valve seat 41 and the valve core 42, and prevent the conductive liquid from flowing out from the gap between the speed regulating valve and the liquid guide channel. It should be noted that the shapes and structures of the valve seat and the valve core are merely examples, and the present invention is not limited thereto.
In an embodiment of the present invention, as shown in fig. 4 and 5, the adjusting structure 5 includes a swing bracket 51 and a rotary joint 52, the swing bracket is an integrated inner and outer double-ring forming structure, and includes an inner ring frame 511 and an outer ring frame 512, the inner ring frame 511 is provided with a threaded through hole, one side of the outer ring frame 512 is provided with a circular bracket, an end of the circular bracket is provided with a straight opening, the other side of the circular bracket is provided with a rotation limiting boss, and the inner ring frame 511 and the outer ring frame 512 are connected through a protruding shaft 513 on the inner ring frame 511; the rotary joint 52 is a cylinder with a built-in stepped hole, and a section of the rotary joint 52 is provided with a rotary limiting groove. The circular bracket is arranged in a step hole of the rotary joint 52, and the rotation angle is limited by the mutual matching of the rotation limiting boss of the swing bracket 51 and the rotation limiting groove of the rotary joint 52.
The inner ring frame 511 and the outer ring frame 512 of the swing bracket 51 swing up and down relatively through the convex shaft 513, the swing bracket 51 and the rotary joint 52 swing left and right relatively through a circular bracket at a certain angle, and the two-degree-of-freedom swing of the shell 1 is realized by utilizing the relative motion of the two parts, so that the two-degree-of-freedom swing device adapts to the arc surface of the scalp to ensure that the electrode is perpendicular to and tightly attached to the scalp. In addition, the inner ring frame 511 of the swing support 51 is connected with the shell 1 through threads, and the length of the sensing electrode is adjusted by adjusting the screwing length of the threads, so that the scalp contact force is adjusted.
In an embodiment of the present invention, as shown in fig. 6, the inductive contact 2 is a stepped cylinder, the outer surface of the small cylinder is provided with threads, the end surface of the small cylinder is provided with a liquid guide channel 21 and a lead wire 23 fixing threaded hole, the end surface of the large cylinder is provided with a valve mounting hole and a spiral groove, the valve mounting hole is a stepped blind hole, and the surface of the large hole is provided with threads; the liquid storage cotton 7 is made of cotton material with strong water absorption and storage capacity and is arranged at the bottom of the spiral groove of the induction contact 2; the flexible contact 6 is a sponge contact 11 and is arranged in the spiral groove, and the end surface of the flexible contact is tightly attached to the liquid storage cotton 7; the screw 24 is arranged in the fixed threaded hole of the lead 13 and is in threaded connection with the inductive contact 2, and the lead 23 is pressed between the screw 24 and the inductive contact 2. It should be noted that the shape and structure of the inductive contact are merely exemplary, and the invention is not limited thereto
As shown in fig. 7, the present invention provides an application method of the above sensing electrode as a dry electrode, including the following steps:
step S700: placing the sensing electrode on the surface of the scalp;
step S710: the length of the sensing electrode is adjusted by adjusting the screwing length of the shell and the adjusting structure, so that the contact force between the sensing electrode and the scalp is adjusted;
step S720: the adjustment structure is used for adjusting the swing of the sensing electrode in the left-right direction and the up-down direction so as to adjust the fitting degree of the sensing electrode and the scalp curved surface;
step S730: and collecting electroencephalogram signals through the sensing electrode after the sensing electrode is closely attached to the scalp.
The sensing electrode can be used as a dry electrode to collect electroencephalogram signals without injecting conductive liquid and conductive paste, and the electroencephalogram signals can be directly guided to a rear-end amplification collection system by the sensing contact and a lead.
As shown in fig. 8, the present invention provides a method for applying the sensing electrode as a semi-dry electrode, comprising the following steps:
step S800: adjusting the opening degree of the speed regulating valve to a preset opening degree;
step S810: placing the sensing electrode on the surface of the scalp;
step S820: the length of the sensing electrode is adjusted by adjusting the screwing length of the shell and the adjusting structure, so that the contact force between the sensing electrode and the scalp is adjusted;
step S830: the adjustment structure is used for adjusting the swing of the sensing electrode in the left-right direction and the up-down direction so as to adjust the fitting degree of the sensing electrode and the scalp curved surface;
step S840: filling conductive liquid into the liquid storage tank and accurately controlling the supply amount of the conductive liquid between the sensing electrode and the surface of the scalp through the opening of the speed regulating valve;
step S850: and collecting electroencephalogram signals through the sensing electrode after the sensing electrode and the surface of the scalp are soaked by the conductive liquid.
When the sensing electrode is used as a semi-dry electrode, the conductive liquid is conveyed to the flexible contact on the end face of the sensing contact through the liquid storage tank, the liquid guide channel of the sensing contact and the speed regulating valve, the flexible contact is extruded and deformed in the contact process of the electrode and the scalp, part of the conductive liquid flows between the sensing electrode and the scalp interface through the flexible contact, and the interface impedance between the electrode and the scalp is reduced by wetting the dead skin of the scalp. At the moment, the electroencephalogram signals can be directly guided to the rear-end amplification acquisition system through the sensing contact and the lead of the sensing electrode. The conductive liquid is accurately conveyed by adjusting the opening of the speed regulating valve, so that the supply amount of the conductive liquid at the electrode/scalp interface is accurately controlled, and the interface is stable.
As shown in fig. 9, the present invention provides a method for applying the sensing electrode as a wet electrode, which comprises the following steps:
step S900: removing the flexible contact from the inductive contact;
step S910: injecting conductive paste on the end face of the induction contact;
step S920: placing the sensing electrode on the surface of the scalp;
step S930: the length of the sensing electrode is adjusted by adjusting the screwing length of the shell and the adjusting structure, so that the contact force between the sensing electrode and the scalp is adjusted;
step S940: the adjustment structure is used for adjusting the swing of the sensing electrode in the left-right direction and the up-down direction so as to adjust the fitting degree of the sensing electrode and the scalp curved surface;
step S950: and collecting electroencephalogram signals through the sensing electrode after the sensing electrode is closely attached to the scalp.
When the sensing electrode is used as a wet electrode, the flexible contact is removed, the conductive paste is injected into the end face of the sensing contact, a coupling channel is formed between the sensing contact and the scalp, and at the moment, an electroencephalogram signal can be directly guided to a rear-end amplification and acquisition system through the sensing contact and a lead.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A dry and wet universal sensing electrode is characterized by comprising a shell, a sensing contact, a liquid storage tank, a speed regulating valve and a regulating structure, wherein the liquid storage tank and the sensing contact are arranged in the shell from top to bottom; the liquid storage tank is provided with a liquid feeding port and a liquid discharging port, conductive liquid is added into the liquid storage tank through the liquid feeding port, and the conductive liquid in the liquid storage tank can flow into the induction contact from the liquid discharging port; the end face of the induction contact is detachably provided with a flexible contact which is in contact with the scalp, a liquid guide channel is arranged in the induction contact and is respectively communicated with the liquid discharge port and the end face of the induction contact, and the conductive liquid flowing out of the liquid discharge port can be conveyed to the end face of the induction contact through the liquid guide channel; the liquid guide channel is internally provided with the speed regulating valve, and the supply amount and the supply speed of the conductive liquid conveyed to the end surface of the induction contact are regulated and controlled by controlling the opening of the speed regulating valve; the adjusting structure is connected with the shell and comprises a swinging support and a rotary joint, and the fitting degree between the sensing electrode and the scalp is adjusted through the swinging support and the rotary joint.
2. The wet and dry sensing electrode as claimed in claim 1, wherein the sensing contact has a spiral groove on its end face, the flexible contact has a spiral shape corresponding to the spiral groove and is detachably disposed in the spiral groove, and the center groove of the spiral groove corresponds to the outlet of the liquid guide channel.
3. The wet and dry sensing electrode according to claim 1 or 2, wherein the speed regulating valve comprises a valve seat and a valve core, the valve seat and the valve core are arranged in the liquid guide channel from top to bottom, a first channel communicated with the liquid guide channel is arranged in the valve seat, a second channel communicated with the liquid guide channel is arranged in the valve core, and the conductive liquid flowing into the liquid guide channel from the liquid storage tank is conveyed to the end face of the sensing contact through the first channel and the second channel in sequence; the valve seat is seated on the valve core to seal the outlet of the first channel, the valve core is in threaded connection with the liquid guide channel, and the opening degree of the outlet of the first channel is regulated and controlled by adjusting the length of the valve core screwed into or out of the liquid guide channel so as to control the opening degree of the speed regulating valve.
4. The wet and dry universal sensing electrode according to claim 1 or 2, wherein the speed regulating valve comprises a valve seat and a valve core, the valve seat and the valve core are arranged in the liquid guide channel from top to bottom, a first channel communicated with the liquid guide channel is arranged in the valve seat, a second channel communicated with the liquid guide channel is arranged in the valve core, a nano-catheter is arranged in the second channel, and the conductive liquid flowing into the liquid guide channel from the liquid storage tank is conveyed to the end face of the sensing contact through the first channel and the nano-catheter in sequence; and controlling the opening of the speed regulating valve by selecting the nano-conduits with different apertures.
5. The dry-wet universal sensing electrode according to claim 4, wherein the valve seat and the valve core are respectively provided with a sealing groove on the outer periphery thereof, and a sealing ring is arranged in the sealing groove.
6. The wet and dry sensing electrode as claimed in claim 1, wherein the adjusting structure comprises a swing bracket and a rotary joint, the swing bracket comprises an inner ring bracket and an outer ring bracket, the inner ring bracket is provided with a threaded through hole, one side of the outer ring bracket is provided with a circular bracket, the end of the circular bracket is provided with a straight opening, the other side of the circular bracket is provided with a rotary limiting boss, and the inner ring bracket and the outer ring bracket are connected through a protruding shaft on the inner ring bracket; the rotary joint is a cylinder with a built-in step hole, a rotary limiting groove is arranged at one section of the rotary joint, the circular support is arranged in the step hole of the rotary joint, and the rotary limiting boss of the swing support and the rotary limiting groove of the rotary joint are matched with each other to realize the limitation of the rotating angle.
7. The dry-wet universal sensing electrode according to claim 1, wherein the liquid filling port is disposed at the top of the liquid storage tank, the liquid outlet needle is disposed at the bottom of the liquid storage tank, two ends of the liquid outlet needle are respectively communicated with the liquid discharging port and the liquid guiding channel, and the outer diameter of the liquid outlet needle is smaller than the outer diameter of the liquid guiding channel and extends into the liquid guiding channel.
8. A method of using the wet and dry universal sensing electrode according to any one of claims 1 to 7, comprising the steps of:
1) placing the sensing electrode on the surface of the scalp;
2) the length of the sensing electrode is adjusted by adjusting the screwing length of the shell and the adjusting structure, so that the contact force between the sensing electrode and the scalp is adjusted;
3) the adjustment structure is used for adjusting the swing of the sensing electrode in the left-right direction and the up-down direction so as to adjust the fitting degree of the sensing electrode and the scalp curved surface;
4) and collecting electroencephalogram signals through the sensing electrode after the sensing electrode is closely attached to the scalp.
9. A method of using the wet and dry universal sensing electrode according to any one of claims 1 to 7, comprising the steps of:
1) adjusting the opening degree of the speed regulating valve to a preset opening degree;
2) placing the sensing electrode on the surface of the scalp;
3) the length of the sensing electrode is adjusted by adjusting the screwing length of the shell and the adjusting structure, so that the contact force between the sensing electrode and the scalp is adjusted;
4) the adjustment structure is used for adjusting the swing of the sensing electrode in the left-right direction and the up-down direction so as to adjust the fitting degree of the sensing electrode and the scalp curved surface;
5) filling conductive liquid into the liquid storage tank and accurately controlling the supply amount of the conductive liquid between the sensing electrode and the surface of the scalp through the opening of the speed regulating valve;
6) and collecting electroencephalogram signals through the sensing electrode after the sensing electrode and the surface of the scalp are soaked by the conductive liquid.
10. A method of using the wet and dry universal sensing electrode according to any one of claims 1 to 7, comprising the steps of:
1) removing the flexible contact from the inductive contact;
2) injecting conductive paste on the end face of the induction contact;
3) placing the sensing electrode on the surface of the scalp;
4) the length of the sensing electrode is adjusted by adjusting the screwing length of the shell and the adjusting structure, so that the contact force between the sensing electrode and the scalp is adjusted;
5) the adjustment structure is used for adjusting the swing of the sensing electrode in the left-right direction and the up-down direction so as to adjust the fitting degree of the sensing electrode and the scalp curved surface;
6) and collecting electroencephalogram signals through the sensing electrode after the sensing electrode is closely attached to the scalp.
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