CN208740965U - A kind of electro-physiological signals detection device based on flexible non-contact electrode - Google Patents
A kind of electro-physiological signals detection device based on flexible non-contact electrode Download PDFInfo
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- CN208740965U CN208740965U CN201721684800.5U CN201721684800U CN208740965U CN 208740965 U CN208740965 U CN 208740965U CN 201721684800 U CN201721684800 U CN 201721684800U CN 208740965 U CN208740965 U CN 208740965U
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Abstract
The utility model provides a kind of electro-physiological signals detection device based on flexible non-contact electrode, it include: flexible non-contact electrode, shielding line, signal acquisition module, signal acquisition module includes impedance matching unit, anti-aliasing filter unit and AD conversion unit；Flexible non-contact electrode, for detecting the potential change of body surface using the flexible non-contact electrode and the coupled capacitor of human skin formation；Shielding line carries out electromagnetic interference shield to the potential change signal for potential change signal to be transferred to the input terminal of the impedance matching unit, and during transmission；Impedance matching unit, for potential change signal to be carried out signal enhanced processing；Anti-aliasing filter unit is filtered for that will pass through amplified potential change signal；AD conversion unit obtains the electro-physiological signals of human body for that will carry out analog-to-digital conversion process by amplification and filtered potential change signal.
Description
Technical Field
The utility model belongs to the physiology signal of telecommunication detection area, concretely relates to physiology signal of telecommunication detection device based on flexible non-contact electrode.
Background
The wearable health monitoring system collects human body motion and physiological parameters by using the wearable biosensor to realize the management of the motion and health of a wearer. Electrocardiography (ECG) and electroencephalography (EEG) are key physiological indicators for diagnosing human diseases and monitoring human health conditions. While wireless technology and electronics miniaturization have advanced significantly, the application and deployment of ECG and EEG on wearable health monitoring systems is still largely limited by the shortcomings of conventional electrodes. Conventional ECG and EEG measurements generally require the use of conductive pastes to reduce the contact resistance of the electrodes to the skin. The biggest disadvantage of the wet electrode is that the conductive paste is easy to dry out within a certain time, which is obviously not beneficial to the long-term monitoring of electrocardio and brain signals. Meanwhile, the use of the conductive paste generally causes irritation to the skin of a patient to generate uncomfortable feeling, so that the patient's acceptance is low. As an improvement, the dry electrode picks up physiological electric signals of a human body through direct contact between the metal electrode and the skin, so that the use of conductive paste is avoided. However, dry electrodes are more demanding on the conductance of the skin and are very sensitive to artifacts such as patient limb movement and electrode movement. In summary, conventional wet and dry electrode technologies cannot meet various requirements of wearable health monitoring systems.
The non-contact electrode is based on a capacitive coupling principle, does not need to be in direct contact with a human body, does not need to be coated with conductive paste, and can accurately measure physiological signals of the human body at certain intervals by insulating materials, so that the non-contact electrode can overcome the limitations of the traditional wet electrode and dry electrode, and has wide application prospect in the field of mobile electrocardiogram monitoring. The non-contact electrode has the advantages that firstly, preparation is not needed before the non-contact electrode is measured; secondly, the skin condition of the testee is not required, the skin does not need to be exposed, the operation is simple and convenient, and reliable measurement of surface physiological signals can be carried out at any time and any place even if the clothes are worn, so that the possibility of skin allergy is eliminated; moreover, the non-contact electrode has lower test load, the discomfort of a testee is reduced to the minimum in the detection process, the electrode polarization phenomenon can be avoided, and the requirement of long-time electrocardiosignal detection can be met. The back of the existing active electrode or non-contact electrode contains a chip without exception, and the non-contact electrode is poor in wearing comfort because the chip has certain hardness. In view of this, there is a need for a non-contact electrode that is comfortable to wear, has little interference, and is simple in structure.
Disclosure of Invention
In order to solve the above-mentioned problem that exists among the prior art, the utility model provides a wear comfortable, shielding nature is good, interference immunity is strong, circuit structure is simple, the accuracy is high, with low costs based on the physiology electricity signal detection device of flexible non-contact electrode.
The utility model discloses a physiological electricity signal detection device based on flexible non-contact electrode, its characterized in that the device includes:
the device comprises a flexible non-contact electrode, a shielding wire and a signal acquisition module, wherein the signal acquisition module comprises an impedance matching unit, an anti-aliasing filtering unit and an analog-to-digital conversion unit;
the flexible non-contact electrode is connected with one end of the shielding wire, the other end of the shielding wire is connected with the input end of the impedance matching unit, the output end of the impedance matching unit is connected with the input end of the anti-aliasing filtering unit, and the output end of the anti-aliasing filtering unit is connected with the analog-to-digital conversion unit;
wherein,
the flexible non-contact electrode is used for detecting the potential change of the human body surface by using the coupling capacitance formed by the flexible non-contact electrode and the human body skin and transmitting the detected potential change signal to the shielding wire;
the shielding wire is used for transmitting the potential change signal received from the flexible non-contact electrode to the input end of the impedance matching unit and shielding the potential change signal in the transmission process by electromagnetic interference, and can be any form of shielding wire (such as a metal mesh shielding wire or a twisted pair);
the impedance matching unit is used for amplifying the potential change signal received from the shielding wire to obtain an amplified potential change signal and transmitting the amplified potential change signal to the anti-aliasing filtering unit;
the anti-aliasing filtering unit is used for filtering the amplified potential change signal received from the impedance matching unit to obtain an amplified and filtered potential change signal and transmitting the amplified and filtered potential change signal to the analog-to-digital conversion unit;
and the analog-to-digital conversion unit is used for performing analog-to-digital conversion processing on the amplified and filtered potential change signal received from the anti-aliasing filtering unit to obtain a physiological electric signal of the human body.
Preferably, the flexible non-contact electrode is composed of two layers of FPC flexible circuit boards, the front layer of the flexible non-contact electrode is composed of FPC flexible electrode plates and an annular shielding ring, the back layer of the flexible non-contact electrode is a shielding layer, the back layer comprises two bonding pads, and the two bonding pads are respectively a first bonding pad corresponding to an electrode signal and a second bonding pad corresponding to a shielding signal.
Preferably, the annular shielding ring of the front layer of the flexible non-contact electrode and the back layer of the flexible non-contact electrode are connected by a plurality of uniformly arranged via holes.
Preferably, the flexible non-contact electrode is a rounded rectangle.
Preferably, the shielded wire is the electromagnetic shield line, the shielded wire includes the four layers, is heart yearn, dielectric insulation layer, metallic shield line, plastics protective sheath respectively from inside to outside, wherein the heart yearn is connected the first pad of flexible non-contact electrode back layer, the metallic shield line is connected the second pad of flexible non-contact electrode back layer.
Preferably, the shielding wire is a single-core shielding wire.
Compared with the prior art, the technical scheme of the utility model, its Flexible non-contact electrode itself does not have the chip to adopt Flexible Printed Circuit (FPC) material as the preparation material of non-contact electrode, wear very comfortablely like this; the shielding wire of the utility model adopts unique multilayer design, the electromagnetic shielding performance is very good, and the interference in the signal transmission process is greatly reduced; in addition, the flexible non-contact electrode of the utility model adopts a unique double-layer design, thereby simplifying the production process and having good shielding property; the utility model discloses a design of leading processing circuit has further been simplified in unique non-contact electrode structure and shielding layer design, has realized the non-contact processing circuit that single fortune was put, has further reduced the electrode cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a structural diagram of a physiological electrical signal detection device based on a flexible non-contact electrode according to the present invention;
FIG. 2 is a structural diagram of a flexible non-contact electrode and a shielding wire in the device for detecting physiological electrical signals based on a flexible non-contact electrode according to the present invention;
FIG. 3 is a comparison graph of electrocardiographic waveforms obtained by the direct contact electrode and the device for detecting physiological electrical signals based on the flexible non-contact electrode of the present invention;
FIG. 4 is an electroencephalogram spectrogram measured by a physiological electrical signal detection device based on a flexible non-contact electrode;
FIG. 5 is an electroencephalogram time domain waveform measured by the physiological electric signal detection device based on the flexible non-contact electrode.
Detailed Description
The technical solution of the present invention for detecting physiological electrical signals based on flexible non-contact electrodes is further described below with reference to the following specific embodiments, it should be noted that the specific technical solution described in the present embodiment is not to be taken as a limitation to the claims of the present invention.
As shown in fig. 1, the physiological electrical signal detection device based on the flexible non-contact electrode of the present invention comprises: the flexible non-contact electrode comprises a flexible non-contact electrode 1, a shielding wire 2 and a signal acquisition module 3, wherein the signal acquisition module comprises an impedance matching unit 3A, an anti-aliasing filtering unit 3B and an analog-to-digital conversion unit 3C.
The flexible non-contact electrode 1 is connected to one end of the shielding wire 2, the other end of the shielding wire 2 is connected to an input end of the impedance matching unit 3A, an output end of the impedance matching unit 3A is connected to an input end of the anti-aliasing filtering unit 3B, and an output end of the anti-aliasing filtering unit 3B is connected to the analog-to-digital conversion unit 3C.
The flexible non-contact electrode 1 is used for detecting the potential change of the human body surface by using the coupling capacitance formed by the flexible non-contact electrode 1 and the human skin 4 and transmitting the detected potential change signal to the shielding wire 2;
the shielding wire 2 is used for transmitting the potential change signal received from the flexible non-contact electrode 1 to the input end of the impedance matching unit 3A and shielding the potential change signal in the transmission process by electromagnetic interference;
the impedance matching unit 3A is configured to perform signal amplification processing on the potential change signal received from the shielded wire 2 to obtain an amplified potential change signal, and transmit the amplified potential change signal to the anti-aliasing filtering unit 3B;
the anti-aliasing filtering unit 3B is configured to perform filtering processing on the amplified potential change signal received from the impedance matching unit 3A to obtain an amplified and filtered potential change signal, and transmit the amplified and filtered potential change signal to the analog-to-digital conversion unit 3C;
and the analog-to-digital conversion unit 3C is configured to perform analog-to-digital conversion processing on the amplified and filtered potential change signal received from the anti-aliasing filtering unit 3B to obtain a physiological electrical signal of a human body.
The utility model discloses a separation of electrode and circuit can be realized to unique non-contact electrode and electromagnetic shield design, has overcome the limitation that traditional non-contact electrode back generally need place chip and circuit, has improved non-contact electrode's flexibility and travelling comfort greatly.
As shown in fig. 2, the flexible non-contact electrode 1 of the present invention is composed of two layers of FPC flexible circuit boards: the front layer 1A is composed of a rounded rectangular FPC flexible electrode plate and an annular shielding ring, and the back layer 1B is a shielding layer; the front layer 1A shielding ring is connected with the back layer 1B through 15 through holes which are uniformly arranged; the back surface layer 1B includes two pads, which are a first pad and a second pad, respectively, and correspond to the electrode signal and the shielding signal, respectively.
The utility model discloses utilize the preparation material of flexible FPC material conduct non-contact electrode, further improved the travelling comfort of testee, long-time wearable health monitoring system and sleep monitor system of specially adapted. Traditional non-contact electrode generally is 3 layers of circular structures (the bottom is the electrode, and the intermediate level is the shielding layer, and the top layer is circuit and chip welded layer), the utility model discloses the improvement is two-layer fillet rectangle structure, has further simplified the production technology of electrode on the one hand, thereby on the other hand has increased the response area between electrode and the skin and has realized the reinforcing of the signal that awaits measuring, has further optimized the effect of electromagnetic shield through the separation of circuit with the electrode simultaneously.
As shown in fig. 2, shielded wire 2 is single core electromagnetic shield line, shielded wire 2 includes the four layers, is heart yearn 2A, dielectric insulation layer 2B, metallic shield line 2C, plastics protective sheath 2D respectively from inside to outside, wherein heart yearn 2A connects flexible non-contact electrode back layer 1B's first pad, metallic shield line 2C connects flexible non-contact electrode back layer 1B's second pad.
The utility model discloses a design of leading processing circuit has further been simplified in unique non-contact electrode structure and shielding layer design, has realized the non-contact processing circuit that single fortune was put, has further reduced the electrode cost.
The electrocardiosignals at the same position (V1: the probing electrode is placed between the 4 th ribs on the right edge of the sternum) are measured by utilizing the traditional direct contact electrode (the electrode metal sheet is directly contacted with the skin) and the physiological electric signal detection device based on the flexible non-contact electrode, and the obtained time domain waveform pair is shown in figure 3. It can be seen from fig. 3 that the utility model provides a physiological electricity signal detection device based on flexible non-contact electrode obtain electrocardiosignal's waveform and SNR and direct contact electrode very similar, proved the utility model discloses a technical scheme is feasible more, and the performance in the electrocardio monitoring can reach the level equivalent with the direct contact electrode.
In addition, still utilize the utility model discloses a bioelectricity signal detection device based on flexible non-contact electrode has measured the EEG signal of a healthy examinee, the O1 position behind the brain is placed to the non-contact electrode, reference electrode (also be non-contact electrode) is placed in the forehead position, the examinee opens the eye 5 seconds in proper order, closes the eye 5 seconds, and 3 times of repetition, the result that obtains is shown in figure 4 and figure 5. when the eye is relaxed to one of the most prominent characteristic of human brain wave, the remarkable α wave component can appear in the EEG, frequency range 8-13 Hz. carries out spectral analysis to the above-mentioned EEG signal that obtains, can find that the obvious crest of α wave because of closing the eye activity appears in the spectrogram (figure 4), figure 5 further time domain analysis shows, when the examinee closes the eye, can observe the remarkable α ripples rhythm, when the examinee closes the eye, α ripples disappears.
It should be noted that the specific embodiments described in this specification, names and the like may be different, and the above description is only illustrative of the method, system and apparatus of the present invention. All equivalent changes or simple changes made according to the methods, characteristics and principles of the present invention are included in the protection scope of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (6)
1. A physiological electrical signal detection device based on a flexible non-contact electrode, characterized in that the device comprises:
the device comprises a flexible non-contact electrode, a shielding wire and a signal acquisition module, wherein the signal acquisition module comprises an impedance matching unit, an anti-aliasing filtering unit and an analog-to-digital conversion unit;
the flexible non-contact electrode is connected with one end of the shielding wire, the other end of the shielding wire is connected with the input end of the impedance matching unit, the output end of the impedance matching unit is connected with the input end of the anti-aliasing filtering unit, and the output end of the anti-aliasing filtering unit is connected with the analog-to-digital conversion unit;
wherein,
the flexible non-contact electrode is used for detecting the potential change of the human body surface by using the coupling capacitance formed by the flexible non-contact electrode and the human body skin and transmitting the detected potential change signal to the shielding wire;
the shielding wire is used for transmitting the potential change signal received from the flexible non-contact electrode to the input end of the impedance matching unit and shielding the potential change signal in the transmission process by electromagnetic interference;
the impedance matching unit is used for amplifying the potential change signal received from the shielding wire to obtain an amplified potential change signal and transmitting the amplified potential change signal to the anti-aliasing filtering unit;
the anti-aliasing filtering unit is used for filtering the amplified potential change signal received from the impedance matching unit to obtain an amplified and filtered potential change signal and transmitting the amplified and filtered potential change signal to the analog-to-digital conversion unit;
and the analog-to-digital conversion unit is used for performing analog-to-digital conversion processing on the amplified and filtered potential change signal received from the anti-aliasing filtering unit to obtain a physiological electric signal of the human body.
2. The physiological electrical signal detection device based on the flexible non-contact electrode according to claim 1, wherein: the flexible non-contact electrode is composed of two layers of FPC flexible circuit boards, the front layer of the flexible non-contact electrode is composed of FPC flexible electrode plates and an annular shielding ring, the back layer of the flexible non-contact electrode is a shielding layer, the back layer comprises two bonding pads, and the two bonding pads are respectively a first bonding pad corresponding to an electrode signal and a second bonding pad corresponding to a shielding signal.
3. The physiological electrical signal detection device based on the flexible non-contact electrode according to claim 2, wherein:
the annular shielding ring of the front layer of the flexible non-contact electrode is connected with the back layer of the flexible non-contact electrode through a plurality of through holes which are uniformly arranged.
4. The physiological electrical signal detection device based on the flexible non-contact electrode according to claim 2, wherein:
the flexible non-contact electrode is in a shape of a rounded rectangle.
5. The physiological electrical signal detection device based on the flexible non-contact electrode according to claim 1, wherein:
the shielded wire is electromagnetic shield line, the shielded wire includes the four layers, is heart yearn, dielectric insulation layer, metallic shield line, plastics protective sheath respectively from inside to outside, wherein the heart yearn is connected the first pad of flexible non-contact electrode back layer, the metallic shield line is connected the second pad of flexible non-contact electrode back layer.
6. The physiological electrical signal detection device based on the flexible non-contact electrode according to claim 5, wherein:
the shielding wire is a single-core shielding wire.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107822619A (en) * | 2017-12-06 | 2018-03-23 | 东莞见达信息技术有限公司 | A kind of electro-physiological signals detection means based on flexible non-contact electrode |
| CN110426427A (en) * | 2019-09-07 | 2019-11-08 | 中国科学院宁波材料技术与工程研究所 | A kind of capacitive coupled sensors, preparation method and application |
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- 2017-12-06 CN CN201721684800.5U patent/CN208740965U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107822619A (en) * | 2017-12-06 | 2018-03-23 | 东莞见达信息技术有限公司 | A kind of electro-physiological signals detection means based on flexible non-contact electrode |
| CN110426427A (en) * | 2019-09-07 | 2019-11-08 | 中国科学院宁波材料技术与工程研究所 | A kind of capacitive coupled sensors, preparation method and application |
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