CN210019328U - An electrode and system for bioelectrical signal sensing - Google Patents

Abstract

The utility model discloses an electrode and a system for sensing bioelectricity signals, which improve the storage capacity of electrolyte by arranging an absorption part to absorb the electrolyte, and the signal stability of a wet electrode is better; in addition, the electrode probe is provided with the covering part covered with the insulating protection layer, so that the defect that the electrode using time is shortened due to long-term exposure of the electrode probe is effectively overcome, the technical problems that the dry electrode signal stability is poor and the using time of a wet electrode is short in the prior art are solved, and the long using time and the good signal stability of the electrode are realized.

Description

An electrode and system for bioelectrical signal sensing

technical field

The utility model relates to the field of biological electrical signals, in particular to an electrode and a system for sensing biological electrical signals.

Background technique

Bioelectrical signals include electrocardiogram (EGG), electroencephalogram (EEG) or electromyography (EMG), wherein EEG is the sum of the cortical potentials of the brain for physiological and psychological activities. The collection and acquisition of EEG plays an important role in brain disease diagnosis, brain-computer interface, psychological intervention, sleep monitoring, etc. It is also the core technology of cognitive neuroscience and is widely used in scientific research in modern psychology, medicine and other fields.

So far, EEG electrodes can be divided into lossy and nondestructive electrodes. Although the lossy electrode can directly contact the cortex, it must puncture the skin or open the skull, which is very risky. Non-destructive electrodes are divided into dry electrodes and wet electrodes. As the name suggests, dry electrodes are those where the electrode and the skin are dry (and not absolutely "dry", there is still a small amount of electrolyte between the electrode and the skin, such as moisture in the surrounding environment or sweat on the skin). It is convenient and does not require special cleaning of the scalp, but it has low signal-to-noise ratio and poor stability, so far it has rarely been used for scientific research purposes.

The wet electrode means that the gap between the skin and the electrode is filled with a conductive medium, so that a metal-electrolyte interface is formed between the electrode and the surface of the human skin. Wet electrodes are divided into two categories, one is conductive paste electrodes, which have ultra-high electrical impedance of the skin and high signal-to-noise ratio. It is time-consuming and labor-intensive. For example, it takes time to clean the skin; each electrode needs to be injected with an appropriate amount of conductive paste to achieve good contact between the scalp and the electrode; and the hair must be washed after the test. The treatment of conductive paste wet electrodes is to fill the scalp-hair gap with conductive paste until it touches the electrode, but the amount and timing of conductive paste injection highly depends on the operator's personal experience and skills. Adhesion and easy series connection between different electrodes, if too few, poor contact. Wet electrodes have been widely used in scientific research, but the above unfavorable factors limit the practical application of wet electrodes in brain-computer interface, psychological assessment and intervention, and are not suitable for scientific research of some special groups, such as the elderly, children, patients, etc. Another wet electrode is a salt water electrode, which can avoid the time-consuming and labor-intensive shortcomings of conductive paste electrodes. It shows that there is no need to inject conductive paste into each electrode, and there is no need to wash hair after testing. more widely used. However, its disadvantage is that the salt water is easy to dry, and the detection cannot last for too long. Usually, salt water needs to be added hole by hole every half an hour or so, which greatly limits the promotion and application of EEG technology in scientific research and application fields. For example, it is impossible for us to target The driver injects electrolyte every half hour while driving.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the present invention is to provide an electrode for bioelectrical signal sensing, which is used to prolong the sensing time of the electrode.

Therefore, the second object of the present invention is to provide a system for bioelectrical signal sensing.

The technical scheme adopted by the utility model is:

In a first aspect, the present invention provides an electrode for bioelectrical signal sensing, comprising an absorbing member for absorbing electrolyte and a plurality of electrode probes, the electrode probes comprising a contact portion in contact with the absorbing member , a cover part covered with an insulating protective layer and a signal acquisition part in contact with the subject's skin, the contact part of the electrode probe sucks the electrolyte from the absorbing member and delivers it to the The signal acquisition part discharges.

Further, the electrode further includes a first mounting plate, the electrode probe is mounted on the first mounting plate, and the covering part and the signal collecting part of the electrode probe protrude from the first mounting plate.

Further, the electrode further includes a second mounting plate and a casing, one end where the contact portion of the electrode probe is located is connected to the second mounting plate, and the casing is respectively connected to the second mounting plate and the first mounting plate. A mounting plate is connected to form a closed cavity, and the absorbing member is disposed inside the closed cavity.

Further, the first mounting plate is detachably connected to the housing.

Further, all or part of the edge of the first mounting plate is serrated, the housing has a groove, and a sawtooth portion is correspondingly arranged in the groove, and the sawtooth portion is connected to the sawtooth of the first mounting plate. The shaped edges cooperate to enable the detachable connection of the first mounting plate and the housing.

Further, the second mounting plate is provided with a liquid filling hole for injecting the electrolyte.

Further, the first mounting plate is covered with an anti-corrosion coating.

Further, the first mounting board further includes an electrode lead lead-out portion, the absorption member is in contact with the anti-corrosion coating, the electrode lead lead-out portion is provided with an electrode lead, and the electrode lead is connected to the anti-corrosion coating. connect.

Further, the absorbent member includes sponge.

In a second aspect, the present invention provides a system for bioelectrical signal sensing, including the electrode for bioelectrical signal sensing.

The beneficial effects of the present utility model are:

The utility model absorbs the electrolyte by arranging the absorbing part to increase the storage capacity of the electrolyte, and the signal stability of the wet electrode is better; in addition, the electrode probe is provided with a covering part covered with an insulating protective layer, which effectively avoids the long-term long-term use of the electrode probe. The defect of shortening the use time of the electrode due to the exposure overcomes the technical problems of poor signal stability of the dry electrode and short service time of the wet electrode in the prior art, and realizes the long use time of the electrode and the good signal stability.

Description of drawings

1 is a schematic structural diagram of a specific embodiment of an electrode probe of an electrode used for bioelectrical signal sensing in the present invention;

2 is a schematic structural diagram of a specific embodiment of an electrode used for bioelectrical signal sensing in the present invention;

FIG. 3 is a schematic structural diagram of a specific embodiment of a first mounting plate of an electrode used for bioelectrical signal sensing according to the present invention.

Detailed ways

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict.

Example 1

An electrode for bioelectrical signal sensing, comprising an absorbing part for absorbing electrolyte and several electrode probes, the electrode probes include a contact part in contact with the absorbing part, a covering part covered with an insulating protective layer, and a contact part with the receiving part. The signal collecting part that the tester's skin contacts, the contact part, the covering part and the signal collecting part are arranged in sequence, the contact part of the electrode probe absorbs the electrolyte from the absorbing part and transports it to the signal collecting part through the covering part for discharge. Referring to FIG. 1, FIG. 1 is a schematic structural diagram of a specific embodiment of an electrode probe of an electrode used for bioelectrical signal sensing in the present invention; in this embodiment, the electrode probe 1 is a pen-tip electrode probe. Needle, the material of the electrode probe 1 includes a hydrophilic resin, specifically, the electrode probe 1 is made of a hydrophilic polyester fiber mixed resin (the tip of a commonly used water-based pen is made of this material), which can Easily absorbs electrolytic solutions such as salt water. The total length of the electrode probe 1 is about 15 mm, wherein the diameter of the head 9 of the electrode probe 1 is about 2.5 mm, the length is 1.2 mm, and it is cylindrical; The contact part with the subject's skin (ie the signal acquisition part) is about 1-2 mm in diameter, slightly elastic, will not pierce the skin, and will not feel pain, and is not invasive to the human body, pen-tip electrode probe Can easily pass through hair. In addition, the absorption part is realized by a strong water-absorbing sponge. The strong water-absorbing sponge plays the role of storing electrolyte (such as salt water), which increases the storage capacity of electrolyte. The liquid is guided to the cone tail of the electrode probe (that is, the signal acquisition part), and the electrolyte is released to the skin through the cone tail. The electrode probe is provided with a covering part covered with an insulating protective layer. In other words, this structure can prolong the use time by several times; effectively avoid the defect of shortening the use time of the electrode due to long-term exposure of the electrode probe, and the signal stability of the wet electrode is better; The technical problem of the short use time of the electrode realizes the long use time of the electrode and the good signal stability. The electrodes in this embodiment can be widely used in the collection of signals such as electrocardiogram, electroencephalogram, and electromyography, and have a very good collection effect especially for the collection of electroencephalogram signals.

Specifically, referring to FIG. 1, FIG. 2 and FIG. 3, FIG. 2 is a schematic structural diagram of a specific embodiment of an electrode used for bioelectrical signal sensing in the present invention, and FIG. A schematic structural diagram of a specific embodiment of the first mounting plate of the electrode for bioelectrical signal sensing; the electrode further includes a first mounting plate 6, a second mounting plate 4 and a casing 5, and the casing 5 is respectively connected with the second mounting plate 4, the first The mounting plate 6 is connected to form a closed cavity, and the absorption component is arranged inside the closed cavity. The absorption component is an absorbent sponge 8 as an example, wherein the outer shell 5 is a cylindrical shell, and the first mounting plate 6 and the second mounting plate 4 are both. It is circular, the second mounting plate 4 is connected with the upper part of the shell 5, the second mounting plate 4 and the shell 5 can be integrally formed, or the second mounting plate 4 and the shell 5 are detachable connections such as screw connection; A mounting plate 6 is detachably connected to the casing 5. In this embodiment, all or part of the edges of the first mounting plate 6 are serrated, and the lower part of the casing 5 has a groove (not shown), and the groove is correspondingly provided with A serrated portion (not shown), which cooperates with the serrated edge of the first mounting plate 6 to achieve a detachable connection between the first mounting plate 6 and the housing 5, and enables the installation and removal of the first mounting plate 6 through the serrated connection All very convenient. The end where the contact portion of the electrode probes 1 is located is fixedly connected to the mounting holes 11 on the second mounting plate 4 . In FIG. 2 , the number of the electrode probes 1 is taken as an example of five, and the second mounting plate 4 is provided with 5 mounting holes; the electrode probe 1 is mounted and fixed on the first mounting plate 6 through the fixing holes 12 on the first mounting plate 6, correspondingly, the first mounting plate 6 has five fixing holes 12; and the electrode probe 1 The covering part and the signal collecting part of the electrode probe protrude from the first mounting plate 6, that is, the contact part of the electrode probe 1 is located inside the cavity, and the covering part and the signal collecting part of the electrode probe 1 protrude from the first mounting plate 6, The length of the protruding part is about 3-5 mm, and the protruding part is coated with an insulating protective film (ie, insulating protective layer) except the section of the cone tail 10 of the electrode probe, which can protect the electrode probe, and can protect the electrode probe. Avoid contact with hair to introduce detection noise, and thirdly, reduce the contact area of electrolyte such as salt water and air to prevent rapid evaporation of electrolyte. In this embodiment, the absorbent sponge 8 is a strong absorbent sponge formed by cylindrical stamping. Correspondingly, the absorbent sponge 8 is provided with 5 through holes for the electrode probe 1 to pass through and contact with the absorbent sponge 8 . In addition, the first mounting plate 6 is covered with an anti-corrosion coating, which can be plated with Ag-AgCl (also can be plated with salt water corrosion-resistant metals such as nickel, titanium, gold, tin); the first mounting plate 6 also includes an electrode lead lead-out portion 7, Absorbing components such as water absorbing sponge 8 are in contact with the anti-corrosion coating to transmit detection signals (such as EEG signals). Electrode leads are provided on the electrode lead lead-out portion 7, and the electrode leads are connected to the anti-corrosion coating. That is, the provision of the anti-corrosion coating is conducive to transmitting the EEG signals collected from the electrode probe 1 to the electrode leads, thereby improving the quality of the detection signal. The lead-out portion 7 of the motor just protrudes through a notch in the lower part of the casing 5 , in addition to the function of leading out the detection signal, it can also play the role of fixing the first mounting plate 6 and the second mounting plate 4 from being rotated at will.

The electrode of this embodiment adopts five (or less, or more) pen-tip electrode probes to be installed on the same plane (ie, the first mounting plate and the second mounting plate), which can not only penetrate the hair, but also damage the scalp. It can make good contact with the scalp, so as to obtain weak EEG signals on the surface of the scalp; and after removing the electrodes, only 5 (or less, or more) small water spots are left on the scalp, which will soon dry naturally It is not necessary to clean the hair afterwards, which makes the application more extensive; by setting the absorption part, the electrode not only has the advantages of high signal-to-noise ratio and stable signal of the traditional wet electrode, but also avoids the traditional wet electrode for short maintenance time and after-treatment. To wash hair and other shortcomings, easy to operate, can be recorded for a long time.

Referring to FIG. 2 , the second mounting plate 4 is provided with a liquid filling hole 4 for injecting electrolyte. In this embodiment, two liquid filling holes 4 are provided, and the liquid filling hole 4 can be used in the middle of signal sensing. The electrolyte is added to achieve the purpose of long-term use; in addition, the electrode is also provided with a mounting part, which is used to fix the electrode on other equipment. The skirt 2 is provided with a through hole 13 , through which the electrode can be conveniently installed on the electrode cap or the electrode strip to realize electrode fixation.

Example 2

Embodiment 2 is provided based on Embodiment 1, and Embodiment 2 provides a system for bioelectrical signal sensing, including the electrode for bioelectrical signal sensing described in Embodiment 1.

The above is a specific description of the preferred implementation of the present utility model, but the invention is not limited to the described embodiments, and those skilled in the art can also make various equivalent deformations on the premise that does not violate the spirit of the present utility model. Or alternatives, these equivalent modifications or alternatives are all included within the scope defined by the claims of the present application.

Claims (10)

1. An electrode for bioelectrical signal sensing, comprising an absorption component for absorbing electrolyte and a plurality of electrode probes, wherein the electrode probes comprise a contact part contacted with the absorption component, a covering part covered with an insulating protective layer and a signal acquisition part contacted with the skin of a testee, and the contact part of the electrode probes absorbs the electrolyte from the absorption component and conveys the electrolyte to the signal acquisition part for discharging through the covering part.

2. The electrode for bioelectrical signal sensing according to claim 1, further comprising a first mounting plate on which the electrode probe is mounted, the covering portion of the electrode probe, the signal collecting portion protruding from the first mounting plate.

3. The electrode for bioelectrical signal sensing according to claim 2, further comprising a second mounting plate and a housing, wherein an end of the electrode probe where the contact portion is located is connected to the second mounting plate, the housing is connected to the second mounting plate and the first mounting plate, respectively, to form a closed cavity, and the absorption member is disposed inside the closed cavity.

4. The electrode for bioelectrical signal sensing according to claim 3, wherein the first mounting plate is detachably connected to the housing.

5. The electrode for bioelectrical signal sensing according to claim 4, wherein an edge of the first mounting plate is entirely or partially serrated, and the housing has a groove in which a serration is correspondingly disposed, and the serration is engaged with the serrated edge of the first mounting plate to detachably connect the first mounting plate and the housing.

6. The electrode for bioelectrical signal sensing according to any one of claims 3 to 5, wherein a charging hole for injecting an electrolyte is provided on the second mounting plate.

7. The electrode for bioelectrical signal sensing according to any one of claims 2 to 5, wherein the first mounting plate is coated with an anti-corrosion coating.

8. The electrode for bioelectrical signal sensing according to claim 7, wherein the first mounting plate further comprises an electrode lead-out portion, the absorbing member being in contact with the corrosion-resistant plating layer, the electrode lead-out portion being provided with an electrode lead, the electrode lead being connected to the corrosion-resistant plating layer.

9. The electrode for bioelectrical signal sensing according to any one of claims 1 to 5, wherein the absorbent member comprises a sponge.

10. A system for bioelectrical signal sensing, comprising the electrode for bioelectrical signal sensing of any one of claims 1 to 9.

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