CN109893131B - Electrode and system for bioelectric signal sensing - Google Patents
Electrode and system for bioelectric signal sensing Download PDFInfo
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- CN109893131B CN109893131B CN201910196170.4A CN201910196170A CN109893131B CN 109893131 B CN109893131 B CN 109893131B CN 201910196170 A CN201910196170 A CN 201910196170A CN 109893131 B CN109893131 B CN 109893131B
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- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The invention discloses an electrode and a system for bioelectric signal sensing, which are characterized in that an absorption part is arranged to absorb electrolyte, so that the storage capacity of the electrolyte is improved, and the signal stability of a wet electrode is better; in addition, the electrode probe is provided with a covering part covered with an insulating protective layer, so that the defect that the electrode is shortened in service time due to long-term exposure of the electrode probe is effectively avoided, the technical problems of poor stability of a dry electrode signal and short service time of a wet electrode in the prior art are overcome, and the long service time and good signal stability of the electrode are realized.
Description
Technical Field
The invention relates to the field of bioelectric signals, in particular to an electrode and a system for bioelectric signal sensing.
Background
Bioelectric signals include Electrocardiography (EGG), electroencephalogram (EEG), or myoelectricity (EMG), where electroencephalogram is the sum of cortical potentials of the brain that perform physiological and psychological activities. The acquisition and acquisition of brain electricity have important roles in brain disease diagnosis, brain-computer interface, psychological intervention, sleep monitoring and the like; also used as a core technology of cognitive neuroscience, and is widely applied to scientific researches in the fields of modern psychology, medicine and the like.
Heretofore, electroencephalogram electrodes have been classified into lossy and lossless electrodes, and the lossy electrodes, although capable of directly contacting the cortex, have to pierce the skin or craniotomy with a great risk. The nondestructive electrode is divided into a dry electrode and a wet electrode. As the name suggests, dry electrodes are dry (and not absolutely "dry", there is still a trace amount of electrolyte between the electrode and the skin, such as ambient moisture or sweat on the skin), and such electrodes are convenient to operate, do not require special cleaning of the scalp, but have low signal to noise ratio and poor stability, and so far are rarely used for scientific research.
The wet electrode is filled with conductive medium in the gap between the skin and the electrode, so that a metal-electrolyte interface is formed between the electrode and the skin surface of the human body. Wet electrodes are classified into two types, one is a conductive paste electrode, which has the advantages of ultra-high skin electrical impedance and high signal-to-noise ratio, excellent conductivity, stable signal, high signal-to-noise ratio and the like, but the disadvantages are mainly time and labor waste, such as time spent in skin cleaning treatment; each electrode is injected with a proper amount of conductive paste to achieve good contact between the scalp and the electrode; and the hair can be cleaned after the detection is finished. The treatment of the conductive paste type wet electrode is to fill the scalp-hair gap by the conductive paste until the conductive paste is filled and contacted with the electrode, but the quantity and the time of the conductive paste injection are highly dependent on the personal experience and skill of operators, the conductive paste is more, the electrodes are adhered and different electrodes are easy to be connected in series, and if the quantity of the conductive paste is too small, the contact is poor. The wet electrode is widely applied in scientific research, but the above adverse factors lead the wet electrode to be limited in the aspects of brain-computer interface, psychological assessment, intervention and other practical application, and are not suitable for scientific research of some special groups, such as the old, children, patients and the like. In addition, the wet electrode is a saline electrode, so that the defect that the conductive paste electrode is time-consuming and labor-consuming can be avoided, the conductive paste is injected into each electrode without time-consuming and labor-consuming, and the hair washing is not needed after the detection is finished, and the wet electrode is widely used in scientific research and practical application at present. However, the method has the defects that the brine is easy to dry, the brine is always Kong Jiazhu every half hour when the detection cannot last for too long, and the popularization and the application of the electroencephalogram technology in the fields of scientific research and application are greatly limited, for example, the electrolyte cannot be injected to a driver in driving every half hour.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, it is an object of the present invention to provide an electrode for bioelectric signal sensing for extending the sensible length of the electrode.
To this end, a second object of the invention is to provide a system for bioelectric signal sensing.
The technical scheme adopted by the invention is as follows:
In a first aspect, the present invention provides an electrode for bioelectric signal sensing, comprising an absorbing member for absorbing an electrolyte and a plurality of electrode probes, the electrode probes comprising a contact portion in contact with the absorbing member, a cover portion covered with an insulating protective layer, and a signal acquisition portion in contact with the skin of a subject, the contact portion of the electrode probes sucking the electrolyte from the absorbing member and delivering it to the signal acquisition portion through the cover portion for ejection.
Further, the electrode further comprises a first mounting plate, the electrode probe is mounted on the first mounting plate, and the covering part and the signal acquisition part of the electrode probe extend out of the first mounting plate.
Further, the electrode further comprises a second mounting plate and a shell, one end of the contact portion of the electrode probe is connected with the second mounting plate, the shell is respectively connected with the second mounting plate and the first mounting plate to form a closed cavity, and the absorption part is arranged inside the closed cavity.
Further, the first mounting plate is detachably connected with the housing.
Further, the edge of the first mounting plate is wholly or partially serrated, the shell is provided with a groove, a serrated portion is correspondingly arranged in the groove, and the serrated portion is matched with the serrated edge of the first mounting plate so that the first mounting plate and the shell can be detachably connected.
Further, the second mounting plate is provided with a liquid adding hole for injecting electrolyte.
Further, the first mounting plate is covered with an anti-corrosion coating.
Further, the first mounting plate further comprises an electrode lead-out portion, the absorbing member is in contact with the anti-corrosion coating, an electrode lead is arranged on the electrode lead-out portion, and the electrode lead is connected with the anti-corrosion coating.
Further, the absorbent member comprises a sponge.
In a second aspect, the invention provides a system for bioelectric signal sensing comprising said electrode for bioelectric signal sensing.
The beneficial effects of the invention are as follows:
According to the invention, the absorption part is arranged to absorb the electrolyte, so that the storage capacity of the electrolyte is improved, 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, so that the defect that the electrode is shortened in service time due to long-term exposure of the electrode probe is effectively avoided, the technical problems of poor stability of a dry electrode signal and short service time of a wet electrode in the prior art are overcome, and the long service time and good signal stability of the electrode are realized.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an electrode probe for bioelectrical signal sensing according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of an electrode for bioelectric signal sensing according to the present invention;
FIG. 3 is a schematic structural view of a first embodiment of a first mounting plate of an electrode for bioelectric signal sensing according to the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
Example 1
The electrode probe comprises a contact part which is in contact with the absorption part, a covering part covered with an insulating protective layer and a signal acquisition part which is in contact with the skin of a testee, wherein the contact part, the covering part and the signal acquisition part are sequentially arranged, and the contact part of the electrode probe absorbs the electrolyte from the absorption part and conveys the electrolyte to the signal acquisition part for discharge through the covering part. Referring to fig. 1, fig. 1 is a schematic structural diagram of an electrode probe of an electrode for bioelectric signal sensing according to an embodiment of the present invention; in this embodiment, the electrode probe 1 is a pen tip type electrode probe, the material of the electrode probe 1 includes hydrophilic resin, specifically, the electrode probe 1 is made of a hydrophilic polyester fiber mixed resin (the pen tip of a conventional water-based pen is made of the material), and the electrode probe can easily absorb an electrolyte solution, such as saline. The total length of the electrode probe 1 is about 15mm, wherein the head 9 of the electrode probe 1 has a diameter of about 2.5 mm and a length of 1.2 mm and is cylindrical; the rest is conical, the diameter of the cone tail 10 (namely the contact part with the skin of the testee, namely the signal acquisition part) of the electrode probe 1 is about 1-2 mm, the electrode probe is slightly elastic, does not penetrate into the skin, does not feel pain, is not invasive to the human body, and the nib type electrode probe can easily penetrate through the hair. In addition, the absorption part is realized by adopting a strong water absorption sponge, the strong water absorption sponge plays a role in storing electrolyte (such as saline water), the storage capacity of the electrolyte is improved, the contact part of the electrode probe is contacted with the water absorption sponge, the electrolyte in the contact part can be quickly guided to the cone tail (namely a signal acquisition part) of the electrode probe, the electrolyte is released to the skin through the cone tail, and the electrode probe is provided with a covering part covered with an insulating protection layer, so that compared with the saline water electrode with short use time at present, the structure can prolong the use time by a plurality of times; the defect that the electrode probe is exposed for a long time to shorten the service life of the electrode is effectively avoided, and the signal stability of the wet electrode is better; the technical problems of poor signal stability of a dry electrode and short service time of a wet electrode in the prior art are solved, and the long service time and good signal stability of the electrode are realized. The electrode in the embodiment can be widely applied to the acquisition of signals such as electrocardio, electroencephalogram, myoelectricity and the like, and particularly has a good acquisition effect on the acquisition of the electroencephalogram signals.
Specifically, referring to fig. 1, 2 and 3, fig. 2 is a schematic structural view of an embodiment of an electrode for bio-electric signal sensing according to the present invention, and fig. 3 is a schematic structural view of a first mounting plate of an electrode for bio-electric signal sensing according to the present invention; the electrode further comprises a first mounting plate 6, a second mounting plate 4 and a shell 5, wherein the shell 5 is respectively connected with the second mounting plate 4 and the first mounting plate 6 to form a closed cavity, an absorption part is arranged in the closed cavity, the absorption part takes a water absorption sponge 8 as an example, the shell 5 is a cylindrical shell, the first mounting plate 6 and the second mounting plate 4 are both circular, the upper parts of the second mounting plate 4 and the shell 5 are connected, the second mounting plate 4 and the shell 5 can be integrally formed, or the second mounting plate 4 and the shell 5 are detachably connected through screw connection and the like; In this embodiment, all or part of the edge of the first mounting plate 6 is in a saw-tooth shape, a groove (not shown) is arranged at the lower part of the housing 5, and a saw-tooth part (not shown) is correspondingly arranged in the groove, and the saw-tooth part is matched with the saw-tooth-shaped edge of the first mounting plate 6 to realize the detachable connection between the first mounting plate 6 and the housing 5, so that the mounting and the dismounting of the first mounting plate 6 are very convenient and fast through the saw-tooth connection. While the end of the contact part of the electrode probe 1 is fixedly connected with the mounting holes 11 on the second mounting plate 4, in fig. 2, the number of the electrode probes 1 is 5 as an example, and then 5 mounting holes are arranged on the second mounting plate 4; The electrode probe 1 is fixedly installed on the first mounting plate 6 through the fixing holes 12 on the first mounting plate 6, and correspondingly, the first mounting plate 6 is provided with 5 fixing holes 12; the covering part and the signal acquisition part of the electrode probe 1 extend out from the first mounting plate 6, namely, the contact part of the electrode probe 1 is positioned in the cavity, the covering part and the signal acquisition part of the electrode probe 1 extend out from the first mounting plate 6, the length of the extending part is about 3-5 mm, and the extending part is coated with an insulating protective film (namely, an insulating protective layer) except the section of the cone tail 10 of the electrode probe, so that the electrode probe can be protected, the contact with hair can be avoided to introduce detection noise, the contact area of electrolyte such as saline and air is reduced, and the rapid evaporation of the electrolyte is prevented. In this embodiment, the water-absorbing sponge 8 is a cylindrical press-formed powerful water-absorbing sponge, and correspondingly, 5 through holes are formed in the water-absorbing sponge 8 to allow the electrode probe 1 to pass through and contact with the water-absorbing sponge 8. The first mounting plate 6 is covered with an anticorrosive plating layer, which may be ag—agcl (or a salt corrosion resistant metal such as nickel, titanium, gold, tin, etc.); the first mounting plate 6 further comprises an electrode lead-out part 7, an absorbing component such as a water absorbing sponge 8 is in contact with the anti-corrosion coating to realize transmission of detection signals (such as brain electrical signals), and an electrode lead is arranged on the electrode lead-out part 7 and connected with the anti-corrosion coating. Namely, the anti-corrosion coating is beneficial to transmitting the brain electrical signals acquired from the electrode probe 1 to the electrode lead, and improving the quality of detection signals. the motor lead-out part 7 just protrudes through a notch at the lower part of the shell 5, has the function of leading out the detection signal, and can also play a role of fixing the first mounting plate 6 and the second mounting plate 4 without random rotation.
The electrode of the embodiment adopts 5 (or less or more) pen point type electrode probes which are arranged on the same plane (namely the first mounting plate and the second mounting plate), not only can penetrate hair, but also can be in nondestructive contact with scalp, and can be well contacted with the scalp, so that weak brain electrical signals on the surface of the scalp are obtained; after the electrode is detached, only 5 (or less or more) small water spots are left on the scalp, so that the scalp is naturally dried quickly, and the hair is not required to be cleaned afterwards, so that the application is wider; through setting up absorbing part, this electrode not only has the high SNR that traditional wet electrode possessed, signal stability's advantage, can avoid traditional wet electrode to maintain the shortcoming such as time weak point, the washing hair after the fact again, convenient operation, can record for a long time.
Referring to fig. 2, a second mounting plate 4 is provided with a liquid adding hole 4 for injecting electrolyte, in this embodiment, two liquid adding holes 4 are provided, and electrolyte can be injected in the middle of signal sensing by using the liquid adding holes 4, so that the purpose of long-term use is achieved; in addition, the electrode is also provided with a mounting part for fixing the electrode on other equipment, in this embodiment, a skirt 2 is arranged at the lower part of the housing 5, a through hole 13 is arranged on the skirt 2, and the electrode can be conveniently mounted on an electrode cap or an electrode belt through the through hole 13 to realize the fixation of the electrode.
Example 2
Embodiment 2 is provided based on embodiment 1, embodiment 2 providing a system for bioelectrical signal sensing comprising the electrode for bioelectrical signal sensing of embodiment 1.
While the preferred embodiment of the present application has been described in detail, the present application is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present application, and the equivalent modifications or substitutions are included in the scope of the present application as defined in the appended claims.
Claims (4)
1. An electrode for bioelectric signal sensing, characterized by comprising an absorbing member for absorbing an electrolyte and a plurality of electrode probes, the electrode probes comprising a contact portion in contact with the absorbing member, a cover portion covered with an insulating protective layer, and a signal acquisition portion in contact with the skin of a subject, the contact portion of the electrode probes sucking the electrolyte from the absorbing member and delivering it to the signal acquisition portion through the cover portion for discharge, the electrode probes being made of a hydrophilic polyester fiber mixed resin;
The electrode probe is arranged on the first mounting plate, and the covering part and the signal acquisition part of the electrode probe extend out of the first mounting plate; the end of the contact part of the electrode probe is connected with the second mounting plate, the shell is respectively connected with the second mounting plate and the first mounting plate to form a closed cavity, the absorption part is arranged in the closed cavity, and the first mounting plate is detachably connected with the shell; the second mounting plate and the shell are integrally formed or detachably connected; the absorption part is provided with a through hole for the electrode probe to pass through so as to realize the contact between the electrode probe and the absorption part;
The edge of the first mounting plate is wholly or partially serrated, the shell is provided with a groove, a serrated part is correspondingly arranged in the groove, and the serrated part is matched with the serrated edge of the first mounting plate so as to realize detachable connection between the first mounting plate and the shell;
The anti-corrosion coating is covered on the first mounting plate, the first mounting plate further comprises an electrode lead guiding-out part, the absorption part is in contact with the anti-corrosion coating to realize detection signal transmission, an electrode lead is arranged on the electrode lead guiding-out part, the electrode lead is connected with the anti-corrosion coating, and the electrode lead guiding-out part extends out through a notch at the lower part of the shell.
2. The electrode for bioelectric signal sensing according to claim 1, wherein a liquid charging hole for charging an electrolyte is provided on the second mounting plate.
3. The electrode for bioelectric signal sensing of claim 1, wherein the absorbent member comprises a sponge.
4. A system for bioelectric signal sensing, characterized by comprising an electrode for bioelectric signal sensing according to any of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910196170.4A CN109893131B (en) | 2019-03-15 | 2019-03-15 | Electrode and system for bioelectric signal sensing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910196170.4A CN109893131B (en) | 2019-03-15 | 2019-03-15 | Electrode and system for bioelectric signal sensing |
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| CN109893131A CN109893131A (en) | 2019-06-18 |
| CN109893131B true CN109893131B (en) | 2024-09-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11896804B2 (en) | 2019-08-02 | 2024-02-13 | Bionime Corporation | Insertion device for a biosensor and insertion method thereof |
| CN212465989U (en) * | 2019-08-02 | 2021-02-05 | 华广生技股份有限公司 | Physiological signal sensing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104068852A (en) * | 2014-06-28 | 2014-10-01 | 苏州格林泰克科技有限公司 | Bio-electricity signal sensor |
| CN108652620A (en) * | 2018-05-30 | 2018-10-16 | 华南理工大学 | Flexible half dry type multilayered structure electrode for acquiring EEG signals |
| CN208492091U (en) * | 2017-12-13 | 2019-02-15 | 浙江普可医疗科技有限公司 | Disposable multi-parameter eeg sensor |
| CN210019328U (en) * | 2019-03-15 | 2020-02-07 | 深圳大学 | An electrode and system for bioelectrical signal sensing |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104224166B (en) * | 2013-06-07 | 2016-11-23 | 上海帝仪科技有限公司 | Wet electrode based on conductive liquid |
| CN104473637B (en) * | 2014-12-17 | 2017-04-26 | 中国科学院电子学研究所 | Electrode probe for detecting electroencephalogram and dry electrode unit applying electrode probe |
| CN105232035B (en) * | 2015-10-15 | 2018-11-02 | 苏州格林泰克科技有限公司 | A kind of bioelectrical signals sensor |
| CN107440715B (en) * | 2017-09-13 | 2024-08-16 | 武汉格林泰克科技有限公司 | Bioelectric signal acquisition device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104068852A (en) * | 2014-06-28 | 2014-10-01 | 苏州格林泰克科技有限公司 | Bio-electricity signal sensor |
| CN208492091U (en) * | 2017-12-13 | 2019-02-15 | 浙江普可医疗科技有限公司 | Disposable multi-parameter eeg sensor |
| CN108652620A (en) * | 2018-05-30 | 2018-10-16 | 华南理工大学 | Flexible half dry type multilayered structure electrode for acquiring EEG signals |
| CN210019328U (en) * | 2019-03-15 | 2020-02-07 | 深圳大学 | An electrode and system for bioelectrical signal sensing |
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Effective date of registration: 20191219 Address after: 518000 Nanhai Road, Guangdong, Shenzhen, No. 3688, No. Applicant after: SHENZHEN University Address before: Three road 410205 in Hunan Province, Yuelu District City, No. 1015 Changsha Fenglin Applicant before: Peng Xiaohu |
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