CN114010197A - Dry-wet mixed electroencephalogram electrode based on space tree-shaped network structure - Google Patents
Dry-wet mixed electroencephalogram electrode based on space tree-shaped network structure Download PDFInfo
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- 238000007789 sealing Methods 0.000 claims description 4
- 210000003128 head Anatomy 0.000 abstract description 38
- 210000004761 scalp Anatomy 0.000 abstract description 23
- 210000004209 hair Anatomy 0.000 description 7
- 210000004556 brain Anatomy 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 1
- 210000003710 cerebral cortex Anatomy 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000537 electroencephalography Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- A61B5/25—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
- A61B5/25—Bioelectric electrodes therefor
- A61B5/251—Means for maintaining electrode contact with the body
- A61B5/256—Wearable electrodes, e.g. having straps or bands
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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
- A61B5/25—Bioelectric electrodes therefor
- A61B5/263—Bioelectric electrodes therefor characterised by the electrode materials
- A61B5/266—Bioelectric electrodes therefor characterised by the electrode materials containing electrolytes, conductive gels or pastes
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention discloses a dry-wet mixed electroencephalogram electrode based on a spatial tree-shaped network structure, which comprises a sleeve, an electrode and a spring, wherein a vertically through stepped hole is formed in the sleeve, the top of the electrode is arranged in the large-aperture inner part of the stepped hole, and the spring is fixed between the top of the electrode and the large-aperture inner top surface of the stepped hole; the electrode comprises a ball head, a ball head rod, a space tree-shaped network structure and an electrode tip, the ball head is hinged inside a large aperture of the step hole, one end, far away from the sleeve, of the ball head is connected with the space tree-shaped network structure through the ball head rod, and the space tree-shaped network structure comprises a multistage transverse flow distribution rod. The invention has the advantages that the invention has the stability of the wet electrode, the low impedance electric connection performance and the use convenience of the dry electrode; meanwhile, the stable transport characteristic of the high-density spatial tree-shaped network structure ensures that the electrode tips at the tail ends output the same amount of conductive paste, and ensures that a stable local conductive film is formed between the electrode tips and the scalp.
Description
Technical Field
The invention relates to the technical field of brain-computer interfaces, in particular to a dry-wet mixed electroencephalogram electrode based on a space tree network structure.
Background
Electroencephalography is the recording of electrical activity produced by neurons of the brain on the surface of the scalp. The brain electrical activity originates from the synchronous synaptic activity of a large number of neurons in the cerebral cortex, with major contributions from pyramidal cells near the scalp, highly polarized, perpendicular to the scalp surface. The electroencephalogram acquisition process specifically comprises the steps that voltage signals recorded by the scalp surface electrodes are converted into signals within a proper voltage range through an amplifier, then the signals are converted into a digital format from an analog voltage format through an analog-to-digital converter, and finally data storage and processing are carried out through a recording computer. The electroencephalogram electrode plays an important role in acquiring high-quality electroencephalogram data, needs to have good conductivity and low contact impedance, and usually uses some conductive media to fill a gap between the electrode and the scalp.
The traditional electroencephalogram signal acquisition mode is that a disc-shaped wet electrode is matched with an elastic fabric electroencephalogram cap and is arranged in a corresponding brain area according to an international 10-20 electrode arrangement system, and when the electroencephalogram signal acquisition device is used, conductive paste is injected into reserved holes of the wet electrode to soak hairs, so that stable and low-impedance electric connection is formed between the wet electrode and the scalp. Although the standard of electroencephalogram signal acquisition is gold, the wet electrode still has the practical problems of complicated operation process of injecting the conductive paste into the electrodes one by one, difficult cleaning of excessive conductive paste, signal crosstalk between the electrodes and the like; for example, chinese patent publication No. CN113080980A discloses an adjustable electroencephalogram electrode module, in which conductive paste needs to be injected into electrodes one by one. Aiming at the defects of the wet electrode, the dry electrode technology is developed gradually, a comb-shaped multi-tooth structure is adopted for penetrating through the hair to be in direct contact with the scalp, the electrical isolation caused by the hair is eliminated, a conductive paste is not needed, and the operation process is simple and convenient; for example, chinese utility model patent publication No. CN213606414U discloses a dry electrode for electroencephalogram detection, wherein the dry electrode is used. However, the interface between the dry electrode and the skin has large impedance, the characteristic of low specific surface area reduces the conductivity of the electrode, and the rigid structure easily generates sliding artifacts, so that a pure electroencephalogram signal is difficult to obtain, and in addition, the wearing comfort is also influenced by higher pressure generated by the compression of the low-density toothed column, for example, the Chinese patent publication No. CN110786852A discloses a dry-wet universal electroencephalogram sensing electrode, but the wearing comfort is also influenced by higher pressure generated by the compression of the low-density electrode.
Disclosure of Invention
The invention aims to provide an electroencephalogram electrode which improves the use convenience and the wearing comfort on the basis of ensuring the quality of an electroencephalogram signal.
In order to solve the technical problems, the invention provides the following technical scheme:
a dry-wet mixed electroencephalogram electrode based on a space tree-shaped network structure comprises a sleeve, an electrode and a spring, wherein a vertically through stepped hole is formed in the sleeve, the top of the electrode is arranged inside a large aperture of the stepped hole, and the spring is fixed between the top of the electrode and the top surface of the inside of the large aperture of the stepped hole;
the electrode comprises a ball head, a ball head rod, a space tree-shaped network structure and an electrode tip, wherein the ball head is hinged inside a large aperture of a step hole, the ball head is far away from one end of a sleeve and is connected with the space tree-shaped network structure through the ball head rod, the space tree-shaped network structure comprises a plurality of levels of transverse shunt rods, the ball head rod is connected with a first level of transverse shunt rods, two ends of the upper level of transverse shunt rods are respectively connected with the lower level of transverse shunt rods to form the space tree-shaped network structure, two ends of the last level of transverse shunt rods are connected with the electrode tip, and a channel communicated with the ball head, the ball head rod, the transverse shunt rods and the electrode tip are internally provided with the channel, and the channel inside the ball head is communicated with the step hole.
The electrode tip at the end part of the high-density spatial tree-shaped network structure can effectively penetrate through hairs and simultaneously reduce the pressure of the electrode tip to the scalp, thereby improving the wearing comfort; meanwhile, the conductive paste flows into the scalp through the channels from the bulb rod, the transverse shunt rod and the electrode head, so that a local conductive film is formed between the scalp and the electrode head, the electrode impedance is effectively reduced, and the electroencephalogram signal acquisition quality is improved. The invention has the advantages of stability of the wet electrode, low impedance electric connection performance and convenience in use of the dry electrode; meanwhile, the stable transport characteristic of the high-density spatial tree-shaped network structure ensures that the electrode tips at the tail ends output the same amount of conductive paste, and ensures that a stable local conductive film is formed between the electrode tips and the scalp.
Preferably, still include the electrode protection cover, the electrode protection cover is hung and is established downtheholely at the step, electrode protection cover top is equipped with the bulb hole that can overlap and establish the bulb.
Preferably, still be equipped with vertical reposition of redundant personnel pole between the horizontal reposition of redundant personnel pole of last one-level and the horizontal reposition of redundant personnel pole of next one-level, be equipped with the passageway with horizontal reposition of redundant personnel pole internal channel intercommunication in the vertical reposition of redundant personnel pole.
Preferably, the sleeve outer wall is provided with an annular groove, and an elastic clamping ring is sleeved in the annular groove.
Preferably, the sleeve is further provided with a threading hole communicated with the stepped hole.
Preferably, a sealing ring is arranged on the inner wall of the channel in the ball head.
Preferably, the ball head rod, the transverse shunt rod and the electrode head are all plated with conducting layers.
Preferably, the size of the transverse flow dividing rod is reduced in steps according to the same proportion.
Preferably, the diameter ratio of the upper-stage transverse flow dividing rod to the lower-stage transverse flow dividing rod is 2: 1.
Preferably, the length ratio of the upper-stage transverse flow dividing rod to the lower-stage transverse flow dividing rod is √ 2: 1.
Compared with the prior art, the invention has the beneficial effects that:
the electrode tip at the end part of the high-density spatial tree-shaped network structure can effectively penetrate through hairs and simultaneously reduce the pressure of the electrode tip to the scalp, thereby improving the wearing comfort; meanwhile, the conductive paste flows into the scalp through the channels from the bulb rod, the transverse shunt rod and the electrode head, so that a local conductive film is formed between the scalp and the electrode head, the electrode impedance is effectively reduced, and the electroencephalogram signal acquisition quality is improved. The invention has the advantages of stability of the wet electrode, low impedance electric connection performance and convenience in use of the dry electrode; meanwhile, the stable transport characteristic of the high-density spatial tree-shaped network structure ensures that the electrode tips at the tail ends output the same amount of conductive paste, and ensures that a stable local conductive film is formed between the electrode tips and the scalp.
Drawings
Fig. 1 is a schematic structural diagram of a dry-wet hybrid electroencephalogram electrode based on a spatial tree network structure according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of an embodiment of the present invention;
FIG. 3 is an enlarged view of A in FIG. 2;
fig. 4 is a schematic structural diagram of an electrode according to an embodiment of the present invention.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention for those skilled in the art, the technical solutions of the present invention will be further described with reference to the drawings attached to the specification.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless explicitly stated or limited otherwise, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 to 4, the embodiment discloses a dry-wet mixed electroencephalogram electrode based on a spatial tree network structure, which comprises a sleeve 1, an electrode 2 and a spring 3, wherein a vertically through stepped hole 11 is formed in the sleeve 1.
The electrode 2 comprises a ball head 21, a ball head rod 22, a space tree-shaped network structure and an electrode head 23, the bulb 21 is hinged inside the large aperture of the stepped hole 11, one end of the bulb 21, which is far away from the sleeve, is connected with a spatial tree-shaped network structure through a bulb rod 22, the spatial tree-shaped network structure comprises a multi-stage transverse shunt rod 24, in this embodiment, the transverse shunting rods 24 are provided with 8 stages, the ball head rod 22 is connected with the first-stage transverse shunting rod 24, two ends of the upper-stage transverse shunting rod 24 are respectively connected with the next-stage transverse shunting rod 24 step by step to form a spatial tree-shaped network structure, two ends of the last-stage transverse shunting rod 24 are both connected with the electrode tip 23, the ball head 21, the ball head rod 22, the transverse shunt rod 24 and the electrode tip 23 are internally provided with communicated channels for the inflow of conductive paste, and the channels in the ball head 21 are communicated with the stepped hole 11; specifically, the injection head of the injector 4 extends into the stepped hole 11 and then enters the passage inside the ball head 21, the conductive paste is injected into the passage, and then the conductive paste sequentially enters the passage of the electrode tip 23 from the ball head rod 22 and the transverse shunt rod 24 and finally flows out from the electrode tip 23.
The spring 3 is fixed between the top of the ball head 21 and the large-aperture inner top surface of the stepped hole 11, the electrode 2 has certain elasticity on the sleeve 1 through the deformation of the spring 3, the electrode adapts to the change of the size of a certain head circumference, and the wearing comfort is improved.
According to the invention, the multi-stage transverse shunt rods 24 form a spatial tree-shaped network structure, the electrode tip 23 is arranged at the end part of the last-stage transverse shunt rod 24, and the electrode tip 23 at the end part of the high-density spatial tree-shaped network structure can effectively penetrate through hairs and simultaneously reduce the pressure of the electrode tip 23 on the scalp, so that the wearing comfort is improved; meanwhile, the conductive paste flows into the scalp through the channels of the bulb rod 22, the transverse shunt rod 24 and the electrode head 23, so that a local conductive film is formed between the scalp and the electrode head 23, the electrode impedance is effectively reduced, and the electroencephalogram signal acquisition quality is improved. The invention has the advantages of stability of the wet electrode, low impedance electric connection performance and convenience in use of the dry electrode; meanwhile, the stable transport characteristic of the high-density spatial tree-shaped network structure ensures that the electrode tips 23 at the tail ends output the same amount of conductive paste, and ensures that a stable local conductive film is formed between the electrode tips 23 and the scalp.
Further, sleeve 1 outer wall is equipped with ring channel 12, the elastic rand 5 is equipped with to the cover in the ring channel 12, sleeve 1 still is equipped with the through wires hole 13 with step hole 11 intercommunication, and electrode line 6 penetrates step hole 11 and is connected with bulb 21 electricity from pipeline hole 13.
Further, still be equipped with vertical reposition of redundant personnel pole (not mark in the figure) between last one-level horizontal reposition of redundant personnel pole 24 and the next one-level horizontal reposition of redundant personnel pole 24, be equipped with the passageway that communicates with horizontal reposition of redundant personnel pole internal channel in the vertical reposition of redundant personnel pole, through the setting of vertical reposition of redundant personnel pole for electrode 2 is spatial three-dimensional distribution.
Further, a sealing ring 7 is arranged on the inner wall of the channel in the bulb 21 and used for sealing the injection end of the injector 4 and preventing the backflow of the conductive paste, conductive layers are plated on the bulb 21, the bulb rod 22, the transverse shunt rod 24 and the electrode tip 23, and the conductive layers are made of Agcl conductive materials.
Still further, the size of the transverse shunt rod 24 is reduced step by step according to the same proportion, the diameter ratio of the upper-stage transverse shunt rod 24 to the lower-stage transverse shunt rod 24 is 2:1, and it should be noted that the upper-stage transverse shunt rod 24 and the lower-stage transverse shunt rod 24 are arranged in the upper-stage transverse shunt rod 24 and the lower-stage transverse shunt rod 24The channel of the part is also gradually reduced according to the diameter ratio; the length ratio of the upper-stage transverse shunt rod 24 to the lower-stage transverse shunt rod 24 is
Further, this embodiment still includes electrode protection cover 8, electrode protection cover 8 is hung and is established in step hole 11, 8 tops of electrode protection cover are equipped with the bulb hole (not mark in the picture) that can overlap and establish bulb 21, and is concrete, bulb 21 and 8 top bulb holes of electrode protection cover and bulb 21 ball socket cooperation back, 8 top outside bosss of electrode protection cover cooperate with step hole 11, guarantee the relative linear motion between electrode protection cover 8 and the sleeve 1 to prevent that electrode protection cover 8 from deviating from by accident, bulb 21 can wind the inboard ball socket universal motion in 8 tops of electrode protection cover, realize spherical motion, and then make electrode 2 can be according to head curvature self-adaptation adjustment angle, keep electrode 2 and head normal coincidence.
The working principle of the embodiment is as follows: electrode tip 23 through the dendritic network structure tip in high density space can effectively pierce through the hair and the laminating is on the scalp, the injection head of syringe 4 stretches into the inside passageway of entering bulb 21 behind the step hole 11, pour into the passageway when with the conductive paste in, and then the conductive paste is in proper order from bulb pole 22, horizontal reposition of redundant personnel pole 24 gets into the passageway of electrode tip 23, finally flow out on the scalp from electrode tip 23, thereby make and form local conductive film between scalp and the electrode tip 23, effectively reduce electrode impedance, promote brain electrical signal collection quality.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The above-mentioned embodiments only represent embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the concept of the present invention, and these embodiments are all within the protection scope of the present invention.
Claims (10)
1. A dry-wet mixed electroencephalogram electrode based on a space tree network structure is characterized in that: the electrode comprises a sleeve, an electrode and a spring, wherein the sleeve is provided with a vertically through stepped hole, the top of the electrode is arranged inside the large aperture of the stepped hole, and the spring is fixed between the top of the electrode and the top surface of the large aperture inside the stepped hole;
the electrode comprises a ball head, a ball head rod, a space tree-shaped network structure and an electrode tip, wherein the ball head is hinged inside a large aperture of a step hole, the ball head is far away from one end of a sleeve and is connected with the space tree-shaped network structure through the ball head rod, the space tree-shaped network structure comprises a plurality of levels of transverse shunt rods, the ball head rod is connected with a first level of transverse shunt rods, two ends of the upper level of transverse shunt rods are respectively connected with the lower level of transverse shunt rods to form the space tree-shaped network structure, two ends of the last level of transverse shunt rods are connected with the electrode tip, and a channel communicated with the ball head, the ball head rod, the transverse shunt rods and the electrode tip are internally provided with the channel, and the channel inside the ball head is communicated with the step hole.
2. The dry-wet mixed electroencephalogram electrode based on the spatial tree network structure, which is disclosed by claim 1, is characterized in that: still include the electrode protection cover, the electrode protection cover is hung and is established downtheholely at the step, electrode protection cover top is equipped with the bulb hole that can overlap and establish the bulb.
3. The dry-wet mixed electroencephalogram electrode based on the spatial tree network structure, which is disclosed by claim 1, is characterized in that: still be equipped with vertical reposition of redundant personnel pole between last one-level horizontal reposition of redundant personnel pole and the next-level horizontal reposition of redundant personnel pole, be equipped with the passageway that communicates with horizontal reposition of redundant personnel pole internal channel in the vertical reposition of redundant personnel pole.
4. The dry-wet mixed electroencephalogram electrode based on the spatial tree network structure, which is disclosed by claim 1, is characterized in that: the sleeve outer wall is equipped with the ring channel, the elastic rand is established to the cover in the ring channel.
5. The dry-wet mixed electroencephalogram electrode based on the spatial tree network structure, which is disclosed by claim 1, is characterized in that: the sleeve is also provided with a threading hole communicated with the step hole.
6. The dry-wet mixed electroencephalogram electrode based on the spatial tree network structure, which is disclosed by claim 1, is characterized in that: and a sealing ring is arranged on the inner wall of the channel inside the ball head.
7. The dry-wet mixed electroencephalogram electrode based on the spatial tree network structure, which is disclosed by claim 1, is characterized in that: and the ball head, the ball head rod, the transverse shunt rod and the electrode head are all plated with conducting layers.
8. The dry-wet mixed electroencephalogram electrode based on the spatial tree network structure, which is disclosed by claim 1, is characterized in that: the size of the transverse flow distribution rod is reduced step by step according to the same proportion.
9. The dry-wet mixed electroencephalogram electrode based on the spatial tree network structure, which is characterized in that: the diameter ratio of the upper-stage transverse shunt rod to the lower-stage transverse shunt rod is 2: 1.
10. The dry-wet mixed electroencephalogram electrode based on the spatial tree network structure, which is characterized in that: the length ratio of the upper-stage transverse shunt rod to the lower-stage transverse shunt rod is
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