CN211749603U - An elastic test electrode for EEG signal acquisition - Google Patents

Abstract

The utility model discloses an elastic test electrode for brain electrical signal acquisition. The upper side of the metal dry electrode head is connected with an electrode head fixing cavity, and the upper side of the electrode head fixing cavity is provided with a signal lead-out port. The inner side of the outlet is provided with a hexagonal nut slot, a conductive sheet is arranged inside, a connection cavity is arranged on the upper side of the hexagonal nut slot, the upper side of the connection cavity is connected with a steering ball, and the upper side of the steering ball is connected with a A spring cavity, a ball bar connecting piece and a spring are arranged inside the spring cavity, a spring cavity fixing bolt is connected to the upper side, an EEG cap is arranged on the upper side of the spring cavity fixing bolt, and the EEG cap is inside There is a collection line pre-arranged on the cap body, the EEG signal collection site, the EEG signal lead-out line and the hanging interface of the collection line. The upper side of the EEG cap is connected with an electrode fixing nut, which has a certain telescopic and rotating ability to make the scalp The surface is uniformly stressed to reduce pain and reduce the impact of mechanical vibration on signal acquisition.

Description

An elastic test electrode for EEG signal acquisition

technical field

The utility model relates to the technical field of EEG acquisition, in particular to an elastic test electrode for EEG signal acquisition.

Background technique

EEG measurement is a common medical diagnosis method, and physiological and pathological information can be obtained by collecting EEG signals. EEG measurements can also provide an important source of EEG signals for emerging wearable devices. EEG measurement is the process of placing electrodes at a certain position on the head to accurately acquire weak EEG signals, and then collecting, amplifying, processing and recording the waveform of EEG signals through EEG equipment such as EEG.

Existing common EEG signal acquisition electrodes can be divided into three types: the first type is columnar electrodes, which are large-volume columnar electrodes. Each columnar electrode is inserted into the mesh electrode cap one by one. The disadvantage is that the operation is troublesome and easy. It is difficult to move the electrode close to the scalp due to the barrier of the hair, which affects the acquisition effect. The columnar electrode is bulky, and it is easy to fall from the mesh electrode cap when the head is shaken. The mechanical disturbance is large, and it is not suitable for long-term brain surgery examine. The second is a metal disc electrode. When using, it needs to be pasted and fixed to the corresponding position of the patient's scalp with electrode paste or collodion one by one. The disadvantage is that the sticking process needs to peel off the hair piece by piece, which is time-consuming and laborious, and the electrode paste or collodion often causes damage to the patient's scalp. A lot of hair, affecting the inspection results. The third method is to fix the metal disc electrode in the electrode cap in advance. The disadvantage is that due to the individual differences of the patient's head circumference, the position of each electrode in the electrode cap is fixed, which is difficult to match with the internationally accepted 10 The -20 standard is in line with, and because of the barrier of the hair, it is difficult for the electrode to be close to the scalp, which affects the inspection effect.

Utility model content

The purpose of the present invention is to provide an elastic test electrode for EEG signal acquisition, so as to solve the problems raised in the above background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: an elastic test electrode for EEG signal acquisition, comprising a metal dry electrode head, a fixed cavity for the electrode head, a signal outlet, a hexagonal nut slot, a connection cavity, a steering Ball rod, spring cavity, spring cavity fixing bolt, electrode fixing nut, collection line pre-arranged on the cap body, EEG signal collection site, ball rod connecting piece, spring, conductive sheet, outer elastic wrapping layer, electromagnetic shielding layer , the wiring collection layer, the hanging interface of the EEG signal lead-out line and the collection line and the EEG cap, the upper side of the metal dry electrode head is connected with an electrode head fixing cavity, and the upper side of the electrode head fixing cavity is provided with a signal outlet , the left side of the signal outlet is provided with a hexagonal nut slot with a conductive sheet connected inside, a connection cavity is arranged on the upper side of the hexagonal nut slot, and a steering ball is connected inside the connection cavity, and the steering ball The upper side of the rod is connected with a spring cavity, the inside of the spring cavity is provided with a ball rod connecting piece and a spring, the upper side is connected with a spring cavity fixing bolt, and an EEG cap is arranged on the upper side of the spring cavity fixing bolt, so the The EEG cap is internally connected with a collection line pre-arranged on the cap body, the EEG signal collection site, the EEG signal lead-out line and the hanging interface of the collection line, and an electrode fixing nut is connected to the upper side of the EEG cap.

Preferably, the EEG cap is divided into upper, middle and lower layers, which are respectively an outer elastic wrapping layer, an electromagnetic shielding layer and a wiring collection layer.

Preferably, the inside of the connection cavity is connected with the steering ball rod through a steering ball, and the steering ball can rotate freely within a certain range inside the connection cavity.

Preferably, the rotation angle of the steering ball is limited within ±45°.

Preferably, the metal dry electrode tip does not need to be coated with electrode liquid or paste, nor does it need to design a container for storing the electrode liquid.

Preferably, the steering ball is connected to the spring through a steering ball rod, and the spring and the washer are fixed inside the spring cavity.

Compared with the prior art, the beneficial effect of the present utility model is that the elastic test electrode of the present utility model adopts a spring-steering ball design structure, and during the operation process, the metal dry electrode tip that collects signals can be made according to the shape of the tester's head. Rotate to a position that is perpendicular to the scalp section, so that the metal dry electrode tip and the scalp surface are in even contact, which reduces the steps of electrode adjustment, saves time, and reduces the impact of mechanical vibration on signal acquisition to a certain extent. The excessive local pressure on the scalp caused by the poor contact between the dry electrode tip and the scalp and uneven force is reduced, and the pain brought to the tester is reduced. In addition, the EEG cap supporting the fixed elastic test electrodes is designed with a three-layer fabric structure, and the signal acquisition lines of each channel exposed on the outside of the cap body are integrated on the wiring acquisition layer wrapped by the shielding layer of the EEG cap, so that the The cap body is beautiful in appearance, easy to wear, and has certain anti-electromagnetic interference ability, and the collected signals are more real and effective.

Description of drawings

Fig. 1 is the exploded structure schematic diagram of the present utility model;

Fig. 2 is the front view of the structure of the utility model;

Fig. 3 is a structural cross-sectional view of the utility model;

Fig. 4 is the bottom view of the structure of the utility model;

Fig. 5 is the top view of the structure of the utility model;

6 is a schematic diagram of the structure of the EEG cap cloth layer of the present invention;

7 is a schematic diagram of the rotation angle of the steering ball rod of the present invention;

In the figure: 1-metal dry electrode head, 2-electrode head fixing cavity, 3-signal outlet, 4-hexagon nut slot, 5-connection cavity, 6-steering ball rod, 7-spring cavity, 8 - Spring cavity fixing bolt, 9- Electrode fixing nut, 10- Cap body pre-arranged collection line, 11- EEG signal collection site, 12- Ball bar connection piece, 13- Spring, 14- Conductive piece, 15- Outer elastic wrapping layer, 16-electromagnetic shielding layer, 17-wiring collection layer, 18-connecting interface of EEG signal lead-out line and collection line, 19-EEG cap.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

1-7, the present utility model provides a technical solution: an elastic test electrode for EEG signal acquisition, comprising a metal dry electrode tip 1, an electrode tip fixing cavity 2, a signal outlet 3, and a hexagonal nut slot 4. Connection cavity 5, steering ball rod 6, spring cavity 7, spring cavity fixing bolt 8, electrode fixing nut 9, collection line 10 pre-arranged on the cap body, EEG signal collection site 11, ball rod connecting piece 12, the spring 13, the conductive sheet 14, the outer elastic wrapping layer 15, the electromagnetic shielding layer 16, the wiring collection layer 17, the hanging interface 18 of the EEG signal lead-out line and the collection line, and the EEG cap 19, the metal dry electrode head 1. The electrode head fixing cavity 2 is connected to the upper side. The upper side of the electrode head fixing cavity 2 is provided with a signal outlet 3. The inner side of the signal outlet 3 is provided with a hexagonal nut slot 4. A conductive sheet 14 is placed inside. The upper side of the nut slot 4 is provided with a connection cavity 5 , the upper side of the connection cavity 5 is connected with a steering ball rod 6 , and the upper side of the steering ball rod 6 is connected with a spring cavity 7 , and the interior of the spring cavity 7 is The ball bar connecting piece 12 and the spring 13 are provided, the upper side is connected with the spring cavity fixing bolt 8, the upper side of the spring cavity fixing bolt 8 is provided with an EEG cap 19, and the EEG cap is internally connected with a cap body pre-installed. The arranged collection line 10, the EEG signal collection site 11 and the EEG signal lead-out line and the hanging interface 18 of the collection line, the EEG cap 19 is connected with an electrode fixing nut 9 on the upper side, and the EEG cap 19 is divided into: The upper, middle and lower layers are the outer elastic wrapping layer 15, the electromagnetic shielding layer 16 and the wiring collection layer 17. The connection cavity 5 is connected with the steering ball lever 6 through the steering ball, and the steering ball can be connected in the connection cavity. It can rotate freely within a certain range inside, and the rotation angle of the steering ball 6 is limited to ±45°. The metal dry electrode tip 1 does not need to be coated with electrode liquid or paste, and does not need to be designed to store electrode liquid. The steering ball is connected to the spring 13 through the steering ball rod 6 , and the spring 13 and the gasket are fixed inside the spring cavity 7 .

Working principle: The elastic test electrode assemblies 1-8 are fixed at the EEG signal collection site 11 of the EEG cap 19 by the electrode fixing nut 9, the spring 13 is placed inside the spring cavity 7, and there is a pad under the spring 13 at the connection with the steering ball. The diameter of the gasket is slightly smaller than the inner diameter of the spring cavity 7, which can restrain the left and right shaking of the steering ball 6. The design of the spring cavity makes the electrode have a certain expansion and contraction ability. The steering ball at the lower part of the steering ball rod 6 is fixed in the connection cavity 5, and the rotation angle of the steering ball rod 6 should be limited within ±45° to prevent the horizontal force from being greater than the vertical force and causing a large mechanical displacement during the signal acquisition process. Causes the electrode to be unstable; the design of the steering ball makes the electrode have a certain free rotation ability. A nut is fixed in the hexagonal nut slot 4 at the bottom of the spring cavity 7. A conductive sheet 14 is placed in the signal outlet 3 on the side of the slot. The left ring of the conductive sheet 14 is located under the hexagonal nut. The central circular hole of the dry-type electrode head 1 is connected with a hexagonal nut, and the metal dry-type electrode head 1 and the conductive sheet 14 are fixed. The conductive sheet 14 leads the EEG signal collected by the dry electrode head 1 from the signal outlet 3, and connects the right ring of 14 and the hanging interface 18 of the EEG signal lead-out line and the collection line through the wire. The arranged acquisition line 10 is transmitted to the single-chip microcomputer for further processing; the signal extraction is more convenient, the EEG signal extraction line and the hanging interface of the acquisition line are located in the electromagnetic shielding layer 16, and the anti-interference is stronger in the process of signal transmission, and the obtained signal more reliable.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention may be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments are to be considered in all respects as exemplary and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is therefore intended that the All changes which come within the meaning and range of equivalents of the claims are intended to be embraced within the present invention, and any reference signs in the claims shall not be construed as limiting the involved claim.

The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (6)

1. The utility model provides an elasticity test electrode that brain electrical signal gathered, including metal dry-type electrode tip (1), electrode tip fixed cavity (2), signal outlet (3), hexagon nut draw-in groove (4), connect cavity (5), turn to club (6), spring cavity (7), spring cavity fixing bolt (8), electrode fixation nut (9), collection line (10) that the cap body was arranged in advance, brain electrical signal collection point (11), club connection piece (12), spring (13), conducting strip (14), outer elasticity parcel layer (15), electromagnetic shield layer (16), layer (17) is gathered in the wiring, brain electrical signal lead-out wire and the interface of hanging (18) and brain electricity cap (19) of gathering line, its characterized in that: an electrode tip fixing cavity (2) is connected to the upper side of the metal dry-type electrode tip (1), a signal leading-out port (3) is arranged on the upper side of the electrode tip fixing cavity (2), a hexagonal nut clamping groove (4) is formed in the inner side of the signal leading-out port (3) and is internally connected with a conducting strip (14), a connecting cavity (5) is formed in the upper side of the hexagonal nut clamping groove (4), a steering ball rod (6) is connected with the connecting cavity (5) and a spring cavity (7), the upper side of the steering ball rod (6) is connected with the spring cavity (7), a ball rod connecting piece (12) and a spring (13) are arranged in the spring cavity (7), a spring cavity fixing bolt (8) is connected to the upper side of the spring cavity fixing bolt (8), an electroencephalogram cap (19) is arranged on the upper side of the spring cavity fixing bolt (8), an acquisition line (10) with a pre, the upper side of the brain electricity cap (19) is connected with an electrode fixing nut (9).

2. The elastic test electrode for electroencephalogram signal acquisition according to claim 1, wherein: the brain electricity cap (19) is divided into an upper layer, a middle layer and a lower layer, and the upper layer, the middle layer and the lower layer are respectively an outer elastic wrapping layer (15), an electromagnetic shielding layer (16) and a wiring collection layer (17).

3. The elastic test electrode for electroencephalogram signal acquisition according to claim 1, wherein: the interior of the connecting cavity (5) is connected with a steering ball rod (6) through a steering ball, and the steering ball can freely rotate within a certain range in the connecting cavity.

4. The elastic test electrode for electroencephalogram signal acquisition according to claim 1, wherein: the rotation angle of the steering ball rod (6) is limited within +/-45 degrees.

5. The elastic test electrode for electroencephalogram signal acquisition according to claim 1, wherein: the metal dry type electrode tip (1) does not need to be coated with electrode liquid or paste, and does not need to be designed with a container for storing the electrode liquid.

6. The elastic test electrode for electroencephalogram signal acquisition of claim 3, wherein: the steering ball is connected with a spring (13) through a steering ball rod (6), and the spring (13) and a gasket are fixed inside the spring cavity (7).

Images