Dry-wet mixed electroencephalogram electrode based on space tree network structure
Technical Field
The utility model relates to the technical field of brain-computer interfaces, in particular to a dry-wet mixed brain-electrical electrode based on a space tree network structure.
Background
Electroencephalogram is the electrical activity produced by brain neurons recorded on the surface of the scalp. The brain electricity originates from the synchronous synaptic activity of a large number of neurons in the cerebral cortex, mainly contributing from pyramidal cells close to the scalp, highly polarized, perpendicular to the scalp surface. The electroencephalogram acquisition process is characterized in that voltage signals recorded by scalp surface electrodes are converted into signals in 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. Electroencephalogram electrodes play an important role in acquiring high quality electroencephalogram data, and are required to have good conductivity and low contact resistance, and gaps between the electrodes and the scalp are typically filled with some conductive medium.
The traditional electroencephalogram signal acquisition mode is that a disk-shaped wet electrode is matched with an elastic fabric electroencephalogram cap to be arranged in a corresponding brain region according to an international 10-20 electrode arrangement system, when the electroencephalogram signal acquisition mode is used, conductive paste is injected into reserved holes of the wet electrode to infiltrate hair, and stable and low-impedance electrical connection is formed between the wet electrode and scalp. Although the electroencephalogram signal acquisition gold standard is adopted, wet electrodes still have the actual problems that the operation process of injecting conductive paste one by one is complex, excessive conductive paste is difficult to clean, signal crosstalk between electrodes and the like; for example, chinese patent publication No. CN113080980a discloses an adjustable electroencephalogram electrode module in which conductive paste is required to be injected electrode by electrode. Aiming at the defects of the wet electrode, the dry electrode technology is developed and mature gradually, and a comb-shaped multi-tooth structure is adopted to penetrate hair to be in direct contact with scalp, so that electrical isolation caused by the hair is eliminated, no conductive paste is needed, and the operation process is simple and convenient; for example, chinese patent publication No. CN213606414U discloses a dry electrode for electroencephalogram detection, wherein the dry electrode is used. However, the interface impedance between the dry electrode and the skin is large, the characteristic of low specific surface area reduces the conductivity of the electrode, and the rigid structure is easy to generate sliding artifacts, so that pure electroencephalogram signals are difficult to obtain, and in addition, the wearing comfort is also affected by the high pressure generated by the compression of the low-density dental column, for example, the Chinese patent publication No. CN110786852A discloses a dry-wet universal type electroencephalogram sensing electrode, but the wearing comfort is also affected by the high pressure generated by the compression of the low-density electrode.
Disclosure of Invention
The technical problem to be solved by the utility model is how to provide the electroencephalogram electrode which improves the use convenience and wearing comfort on the basis of ensuring the quality of electroencephalogram signals.
In order to solve the technical problems, the utility model provides the following technical scheme:
the dry-wet mixed electroencephalogram electrode based on the space tree network structure comprises a sleeve, an electrode and a spring, wherein a vertically through step hole is formed in the sleeve, the top of the electrode is arranged in the large-aperture of the step hole, and the spring is fixed between the top of the electrode and the top surface of the large-aperture of the step hole;
the electrode includes bulb, bulb pole, space arborescent network structure and electrode tip, the bulb is articulated to be established inside the large aperture of step hole, telescopic one end is kept away from to the bulb is passed through bulb pole and is connected space arborescent network structure, space arborescent network structure includes multistage horizontal reposition of redundant personnel pole, the bulb pole is connected with first order horizontal reposition of redundant personnel pole, and the both ends of last level horizontal reposition of redundant personnel pole are connected next level horizontal reposition of redundant personnel pole respectively step by step and are formed space arborescent network structure, and the both ends of last level horizontal reposition of redundant personnel pole are all connected the electrode tip, bulb pole, horizontal reposition of redundant personnel pole and the inside passageway that is equipped with of electrode tip, the inside passageway of bulb and step hole intercommunication.
The space tree-shaped network structure is formed through the multi-stage transverse flow distribution rods, and the electrode heads are arranged at the end parts of the last-stage transverse flow distribution rods, so that the electrode heads at the end parts of the high-density space tree-shaped network structure can effectively penetrate hair, meanwhile, the pressure of the electrode heads on the scalp is reduced, and the wearing comfort is improved; meanwhile, the conductive paste flows into the scalp through the channels of the ball head 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 utility model has the advantages of stable wet electrode, low impedance electric connection performance and convenience for using dry electrode; meanwhile, the stable transportation characteristic of the high-density space tree network structure ensures that the electrode heads at the tail ends output the same amount of conductive paste, and ensures that a stable local conductive film is formed between the electrode heads and the scalp.
Preferably, the electrode protection cover is hung in the step hole, and a ball head hole capable of sleeving a ball head is formed in the top of the electrode protection cover.
Preferably, a vertical flow distribution rod is further arranged between the upper-stage transverse flow distribution rod and the lower-stage transverse flow distribution rod, and a channel communicated with the internal channel of the transverse flow distribution rod is arranged in the vertical flow distribution rod.
Preferably, the outer wall of the sleeve 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 inside the ball head.
Preferably, the ball head rod, the transverse shunt rod and the electrode head are all plated with conductive layers.
Preferably, the dimensions of the lateral diverter rods are scaled down in steps to the same scale.
Preferably, the diameter ratio of the upper stage transverse diverter rod to the lower stage transverse diverter rod is 2:1.
Preferably, the length ratio of the upper stage transverse diverter rod to the lower stage transverse diverter rod is ∈2:1.
Compared with the prior art, the utility model has the beneficial effects that:
the space tree-shaped network structure is formed through the multi-stage transverse flow distribution rods, and the electrode heads are arranged at the end parts of the last-stage transverse flow distribution rods, so that the electrode heads at the end parts of the high-density space tree-shaped network structure can effectively penetrate hair, meanwhile, the pressure of the electrode heads on the scalp is reduced, and the wearing comfort is improved; meanwhile, the conductive paste flows into the scalp through the channels of the ball head 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 utility model has the advantages of stable wet electrode, low impedance electric connection performance and convenience for using dry electrode; meanwhile, the stable transportation characteristic of the high-density space tree network structure ensures that the electrode heads at the tail ends output the same amount of conductive paste, and ensures that a stable local conductive film is formed between the electrode heads and the scalp.
Drawings
FIG. 1 is a schematic diagram of a dry-wet hybrid brain electrode based on a spatial tree network structure according to an embodiment of the present utility model;
FIG. 2 is a cross-sectional view of an embodiment of the present utility model;
FIG. 3 is an enlarged view of FIG. 2A;
fig. 4 is a schematic structural diagram of an electrode according to an embodiment of the present utility model.
Detailed Description
In order to facilitate the understanding of the technical scheme of the present utility model by those skilled in the art, the technical scheme of the present utility model will be further described with reference to the accompanying drawings.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated unless otherwise explicitly specified and defined. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1 to 4, the embodiment discloses a dry-wet mixed electroencephalogram electrode based on a space tree network structure, which comprises a sleeve 1, an electrode 2 and a spring 3, wherein a vertically through step 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, wherein the ball head 21 is hinged inside a large aperture of the step hole 11, one end of the ball head 21, which is far away from a sleeve, is connected with the space tree-shaped network structure through the ball head rod 22, the space tree-shaped network structure comprises a multi-stage transverse flow distribution rod 24, in the embodiment, the transverse flow distribution rod 24 is provided with 8 stages, the ball head rod 22 is connected with a first-stage transverse flow distribution rod 24, two ends of the upper-stage transverse flow distribution rod 24 are respectively connected with a next-stage transverse flow distribution rod 24 step by step to form the space tree-shaped network structure, two ends of the last-stage transverse flow distribution rod 24 are respectively connected with the electrode head 23, and channels which are communicated are respectively arranged inside the ball head 21, the ball head rod 22, the transverse flow distribution rod 24 and the electrode head 23 and are used for inflow of conductive paste, and the channels inside the ball head 21 are communicated with the step hole 11; specifically, the injection head of the injector 4 extends into the stepped hole 11 and then enters the channel inside the ball head 21, the conductive paste is injected into the channel, and then the conductive paste sequentially enters the channel of the electrode head 23 from the ball head rod 22 and the transverse shunt rod 24, and finally flows out from the electrode head 23.
The spring 3 is fixed between the top of the ball head 21 and the top surface of the large-aperture inner part of the stepped hole 11, the electrode 2 has certain elasticity on the sleeve 1 through deformation of the spring 3, and the wearing comfort is improved due to adaptation to certain head circumference size change.
According to the utility model, a space tree-shaped network structure is formed by the multi-stage transverse flow distribution rods 24, and the electrode heads 23 are arranged at the end parts of the last-stage transverse flow distribution rods 24, so that the electrode heads 23 at the end parts of the high-density space tree-shaped network structure can effectively penetrate hair, meanwhile, the pressure of the electrode heads 23 on scalp is reduced, and the wearing comfort is improved; meanwhile, the conductive paste flows into the scalp through the channels of the ball head 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 utility model has the advantages of stable wet electrode, low impedance electric connection performance and convenience for using dry electrode; meanwhile, the stable transportation characteristic of the high-density space tree network structure ensures that the electrode heads 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 heads 23 and the scalp.
Further, an annular groove 12 is formed in the outer wall of the sleeve 1, an elastic clamping ring 5 is sleeved in the annular groove 12, a threading hole 13 communicated with the step hole 11 is further formed in the sleeve 1, and the electrode wire 6 penetrates through the step hole 11 from the threading hole 13 and is electrically connected with the ball head 21.
Further, a vertical flow distribution rod (not labeled in the figure) is further arranged between the upper-stage transverse flow distribution rod 24 and the lower-stage transverse flow distribution rod 24, a channel communicated with the internal channel of the transverse flow distribution rod is arranged in the vertical flow distribution rod, and the electrodes 2 are spatially and three-dimensionally distributed through the arrangement of the vertical flow distribution rod.
Further, a sealing ring 7 is arranged on the inner wall of the channel inside the ball head 21 and used for sealing the injection end of the injector 4 to prevent the backflow of the conductive paste, and conductive layers are plated on the ball head 21, the ball head rod 22, the transverse shunt rod 24 and the electrode tip 23, and are made of Agcl conductive materials.
Still further, the dimensions of the lateral
flow dividing rods 24 are gradually reduced according to the same ratio, the diameter ratio of the upper lateral
flow dividing rod 24 to the lower lateral
flow dividing rod 24 is 2:1, and it should be noted that the channels inside the upper lateral
flow dividing rod 24 and the lower lateral
flow dividing rod 24 are also gradually reduced according to the diameter ratio; the length ratio of the upper stage transverse
flow dividing bar 24 to the lower stage transverse
flow dividing bar 24 is
Further, this embodiment further includes electrode protection cover 8, electrode protection cover 8 hangs and establishes in step hole 11, electrode protection cover 8 top is equipped with the bulb hole (not annotate in the figure) that can overlap bulb 21, and specifically, bulb 21 and electrode protection cover 8 top bulb hole and bulb 21 ball socket cooperation back, electrode protection cover 8 top outside boss and step hole 11 cooperation guarantee the relative rectilinear motion between electrode protection cover 8 and sleeve 1 to prevent that electrode protection cover 8 is unexpected to deviate from, bulb 21 can be around the inboard bulb nest universal motion in electrode protection cover 8 top, realizes spherical motion, and then makes electrode 2 can keep electrode 2 and head normal coincidence according to head curvature self-adaptation angle of adjustment.
The working principle of the embodiment is as follows: the electrode tip 23 at the end part of the high-density space tree-shaped network structure can effectively penetrate hair and be attached to the scalp, the injection head of the injector 4 stretches into the step hole 11 and then enters the channel inside the bulb 21, conductive paste is injected into the channel, and then the conductive paste sequentially enters the channel of the electrode tip 23 from the bulb rod 22 and the transverse shunt rod 24 and finally flows out of the electrode tip 23 on the scalp, so that a local conductive film is formed between the scalp and the electrode tip 23, electrode impedance is effectively reduced, and electroencephalogram signal acquisition quality is improved.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model 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.
The above-described embodiments merely represent embodiments of the utility model, the scope of the utility model is not limited to the above-described embodiments, and it is obvious to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.