CN109124628A - A kind of myoelectricity acquisition device based on flexible active electrode - Google Patents
A kind of myoelectricity acquisition device based on flexible active electrode Download PDFInfo
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- CN109124628A CN109124628A CN201811199168.4A CN201811199168A CN109124628A CN 109124628 A CN109124628 A CN 109124628A CN 201811199168 A CN201811199168 A CN 201811199168A CN 109124628 A CN109124628 A CN 109124628A
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- Prior art keywords
- signal
- array
- circuit
- electrode
- acquisition device
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/296—Bioelectric electrodes therefor specially adapted for particular uses for electromyography [EMG]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/389—Electromyography [EMG]
Abstract
The present invention provides a kind of myoelectricity acquisition device based on flexible active electrode, including apparatus main body, apparatus main body includes electrod-array, signal conditioning circuit and signal pickup assembly；Electrod-array is connect by signal conditioning circuit with signal pickup assembly, and the electromyography signal that electrod-array obtains is then transferred to signal pickup assembly by the adjusting of signal conditioning circuit；Impedance inverter circuit is provided between electrod-array and signal conditioning circuit.Flexible electrode, inside setting impedance inverter circuit and signal conditioning circuit are made using active mode, influence of the electrode-skin contact impedance to electromyography signal can be reduced, reduce the interference of industrial frequency noise, obtain the surface electromyogram signal of higher quality, more low noise.
Description
Technical field
The present invention relates to technical field of electronic components more particularly to a kind of myoelectricity based on flexible active electrode to acquire dress
It sets.
Background technique
Adjoint electric signal when surface electromyogram signal is contraction of muscle is the important side in body surface Non-invasive detection muscle activity
Method.We research and analyse the detection and analysis method of surface electromyogram signal, also include detection technique and device and utilization surface flesh
The method etc. of electric signal feedback control external device (ED).Its application background is concentrated mainly on medical science of recovery therapy and sports science two is led greatly
Domain.
Electromyography signal neuromuscular system status assessment, clinical diagnosis and in terms of have and important grind
Study carefully meaning and application value, such as EMG-controlling prosthetic hand self adaptive control, muscle fiber conduction velocity assessment.With clinically common needle electricity
Pole EMG is compared, surface myoelectric have the advantages that it is non-invasive, suitable for long-term continuous repeatability measurement and for the survey of child
Amount monitoring.
During existing acquisition device is to surface electromyogram signal acquisition, since skin-electrode contact impedance is larger, vulnerable to
Power frequency component interference, influences collected signal quality.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of, the myoelectricity based on flexible active electrode acquires dress
It sets, during solving existing acquisition device to surface electromyogram signal acquisition, the skin-electrode contact impedance of generation is larger, vulnerable to work
Frequency signal interference problem.
The technical scheme of the present invention is realized as follows:
A kind of myoelectricity acquisition device based on flexible active electrode provided by the invention, including apparatus main body, feature exist
In described device main body includes electrod-array, signal conditioning circuit and signal pickup assembly；
The electrod-array is connect by the signal conditioning circuit with signal pickup assembly, the myoelectricity that electrod-array obtains
Signal is then transferred to signal pickup assembly by the adjusting of signal conditioning circuit；
Impedance inverter circuit is provided between the electrod-array and signal conditioning circuit.
Preferably, the array for the 2*2 that the electrod-array is at least made of 4 electrodes, the spacing between electrode is in 3mm-
Between 5mm.
Preferably, the electrode includes flexbile base, is sequentially set with copper electricity along bottom-up on the flexbile base
Pole layer, nickel layer and layer gold；
It preferably, include operational amplifier inside the impedance inverter circuit, the operational amplifier uses OPA376.
Preferably, the operational amplifier uses positive and negative dual power supply for operational amplifier power supply.
Preferably, the flexbile base using polyimides make, the flexible bottom layer with a thickness of 120 μm -160 μm it
Between.
Preferably, the signal conditioning circuit includes primary filtering and amplifying circuit and secondary amplification circuit；The primary
Filtering and amplifying circuit is by instrument amplifier AD8221, capacitance resistance by being electrically connected to form；The secondary amplification circuit is by amplifier
AD706 is with capacitance resistance by being electrically connected to form.
Preferably, the signal pickup assembly includes data acquisition card and computer, and the data acquisition card collects
Data passed through USB port and be transmitted to computer, the data acquisition card uses NIUSB-6218.
The utility model has the advantages that
Flexible electrode, inside setting impedance inverter circuit and signal conditioning circuit are made using active mode, can be reduced
Influence of the electrode-skin contact impedance to electromyography signal reduces the interference of industrial frequency noise, obtains the table of higher quality, more low noise
Facial muscle electric signal.Flexible electrode array has preferable comfort, can be well adapted for the uneven region of skin surface to increase
Forceful electric power pole and skin contact are to obtain lesser baseline noise.Active flexible electrode array can further decrease outside noise pair
The influence of electromyography signal has lower baseline noise and higher signal-to-noise ratio.
Detailed description of the invention
Fig. 1 is a kind of structure principle chart of the myoelectricity acquisition device based on flexible active electrode of the present invention；
Fig. 2 is the circuit diagram of the impedance inverter circuit in the present invention；
Fig. 3 is the circuit diagram of the primary filtering and amplifying circuit in the present invention
Fig. 4 is the circuit diagram of the secondary amplification circuit in the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, figure obtained by those of ordinary skill in the art without making creative efforts have it
His embodiment, shall fall within the protection scope of the present invention.
As shown in Figs 1-4, the embodiment of the present invention proposes a kind of myoelectricity based on flexible active electrode provided by the invention
Acquisition device, including apparatus main body, apparatus main body include electrod-array, signal conditioning circuit and signal pickup assembly；
Electrod-array is connect by signal conditioning circuit with signal pickup assembly, and the electromyography signal that electrod-array obtains is led to
The adjusting for crossing signal conditioning circuit, is then transferred to signal pickup assembly；
Impedance inverter circuit is provided between electrod-array and signal conditioning circuit, impedance inverter circuit is to collected flesh
Electric signal is adjusted；Because the impedance of electrode and skin contact is higher, when walking between connection electrode and signal conditioning circuit
When line or longer cable, vulnerable to the interference of power frequency component and external electromagnetic field, signal quality is finally influenced.For this purpose, to be each logical
Road electrode design impedance inverter circuit all the way, does impedance transformation electricity in the top layer placement operational amplifier of flexible electrode array
The electromyography signal signal of high output impedance is changed into the electromyography signal of low output impedance by road, reduces industrial frequency noise and space electricity
The influence in magnetic field, while improving the output driving ability of electromyography signal signal.
Electrod-array is the array that 2*2 is at least made of 4 electrodes, the spacing between electrode between 3mm-5mm, if
Spacing is too low too small between electrode, can generate signal interference, if spacing is excessive, internal electric source route increases, and impedance increases, electricity
Pole induction is insensitive.
Electrode includes flexbile base, is sequentially set with copper electrode layer, nickel layer and gold along bottom-up on flexbile base
Layer；Flexbile base is made of polyimides, flexible bottom layer with a thickness of between 120 μm -160 μm, this thickness guarantees flexible base
Layer flexibility with higher, has preferable comfort, the present embodiment is in order to which middle electrode is in order to which stabilized structure is in flexible material
The copper disk of 35 μm of diameter 2.5mm, the thickness of upper printing, to stablize skin-electrode contact impedance, electrode surface is coated with 2 μ m-thicks
The layer gold of the nickel of degree and 0.035 μ m thick.
It include operational amplifier inside impedance inverter circuit, operational amplifier uses OPA376.
Operational amplifier uses positive and negative dual power supply for operational amplifier power supply.
Signal conditioning circuit includes primary filtering and amplifying circuit and secondary amplification circuit；Primary filtering and amplifying circuit is by instrument
Table amplifier AD8221, capacitance resistance are by being electrically connected to form；Secondary amplification circuit passes through electricity by amplifier AD706 and capacitance resistance
It connects and composes.The signal conditioning circuit of design includes amplification and filter function, is made of two-stage circuit.Fig. 3 show primary and puts
Big filter circuit is mainly made of instrument amplifier and capacitance resistance.Primary circuit carries out about 60 times of differential amplifications, 15Hz to signal
Single order high pass and 725Hz first-order low-pass wave.Due to the voltage noise of flexible electrode array amplifier after impedance converts
It is affected, to reduce influence of the front voltage noise to follow-up signal, while to inhibit the 50Hz common mode work introduced by electrode
Frequency noise has selected the instrument amplifier AD8221 of low-voltage noise, high cmrr.Pass through at the gain resistor end of AD8221
Series resistance and capacitor constitute single order high-pass filtering, it is contemplated that the size of signal regulating panel, resistance in the present embodiment circuit design
Capacitor uses 0603 encapsulation format, and capacitor maximum selectable value is 10 μ F, and corresponding 1k Ω resistance realizes the high-pass filtering of 15Hz single order.
Single order RC low-pass filtering is constituted in AD8221 output end series resistance-capacitance, 725Hz is realized by 1k Ω resistance and 220nF capacitor
Low-pass filtering.Fig. 4 show second level amplifying circuit, using the multiple feedback bandpass filter structures insensitive to capacitance resistance
The bandwidth-limited circuit for realizing about 30 times of signal amplification and 20~500Hz, is mainly made of AD706 and capacitance resistance.In number
According to collecting part, 10 tunnel simulation outputs are converted to by digital signal using NI USB6218 data collecting card and are passed by USB port
Transport to personal computer.NI USB-6218 has the sampling precision of 32 road analog input channels and 16 ADC, meets required lead to
Road number and accuracy requirement.Industrial-frequency alternating current can be further isolated using notebook personal computer.It is write using Visual C++
Multi-channel surface myoelectric data acquisition software, which is realized, stores the real-time display and data of electromyography signal waveform.
Finally, it should be noted that the foregoing is merely presently preferred embodiments of the present invention, it is merely to illustrate skill of the invention
Art scheme, is not intended to limit the scope of the present invention.Any modification for being made all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., are included within the scope of protection of the present invention.
Claims (8)
1. a kind of myoelectricity acquisition device based on flexible active electrode, including apparatus main body, which is characterized in that described device main body
Including electrod-array, signal conditioning circuit and signal pickup assembly；
The electrod-array is connect by the signal conditioning circuit with signal pickup assembly, the myoelectricity letter that electrod-array obtains
Number, by the adjusting of signal conditioning circuit, it is then transferred to signal pickup assembly；
Impedance inverter circuit is provided between the electrod-array and signal conditioning circuit.
2. the myoelectricity acquisition device according to claim 1 based on flexible active electrode, which is characterized in that the electrode array
The array for the 2*2 being at least made of 4 electrodes is arranged, the spacing between electrode is between 3mm-5mm.
3. the myoelectricity acquisition device according to claim 2 based on flexible active electrode, which is characterized in that the electrode packet
It includes flexbile base, is sequentially set with copper electrode layer, nickel layer and layer gold along bottom-up on the flexbile base.
4. the myoelectricity acquisition device according to claim 1 based on flexible active electrode, which is characterized in that the impedance becomes
Changing includes operational amplifier inside circuit, and the operational amplifier uses OPA376.
5. the myoelectricity acquisition device according to claim 4 based on flexible active electrode, which is characterized in that the operation is put
Big device uses positive and negative dual power supply for operational amplifier power supply.
6. the myoelectricity acquisition device according to claim 1 based on flexible active electrode, which is characterized in that the flexibility base
Layer is made of polyimides, the flexible bottom layer with a thickness of between 120 μm -160 μm.
7. the myoelectricity acquisition device according to claim 1 based on flexible active electrode, which is characterized in that the signal tune
Managing circuit includes primary filtering and amplifying circuit and secondary amplification circuit；The primary filtering and amplifying circuit is by instrument amplifier
AD8221, capacitance resistance are by being electrically connected to form；The secondary amplification circuit is by amplifier AD706 with capacitance resistance by being electrically connected
Connect composition.
8. the myoelectricity acquisition device according to claim 1 based on flexible active electrode, which is characterized in that the signal is adopted
Acquisition means include data acquisition card and computer, and the collected data of data acquisition card passed through USB port and are transmitted to meter
Calculation machine, the data acquisition card use NI USB-6218.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811199168.4A CN109124628A (en) | 2018-10-15 | 2018-10-15 | A kind of myoelectricity acquisition device based on flexible active electrode |
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|---|---|---|---|
| CN201811199168.4A CN109124628A (en) | 2018-10-15 | 2018-10-15 | A kind of myoelectricity acquisition device based on flexible active electrode |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110200627A (en) * | 2019-06-05 | 2019-09-06 | 上海大学 | A kind of active high-density electrode array and preparation method thereof |
| CN110311457A (en) * | 2019-08-02 | 2019-10-08 | 中山大学附属第三医院 | It is a kind of using skin pricktest as the portable storage battery of power supply |
| CN111289819A (en) * | 2020-04-09 | 2020-06-16 | 中山大学 | Integrated recording regulation and control system for measuring intracellular electric signals by myocardial cell electroporation |
| CN113093061A (en) * | 2021-04-22 | 2021-07-09 | 北京机械设备研究所 | Flexible array electrode on-off detection method based on sweep frequency screening |
| CN114098739A (en) * | 2021-11-08 | 2022-03-01 | 浙江大学 | Micro-needle array measuring system for electromyographic signal measurement |
| CN110311457B (en) * | 2019-08-02 | 2024-05-03 | 中山大学附属第三医院 | Portable storage battery using skin electricity as power supply |
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| CN103393420A (en) * | 2013-07-30 | 2013-11-20 | 中国科学技术大学 | High-density active flexible electrode array and signal conditioning circuit thereof |
| US20150327808A1 (en) * | 2014-05-19 | 2015-11-19 | Anthrotronix, Inc. | Electrodermal Interface System |
| CN107374625A (en) * | 2017-06-19 | 2017-11-24 | 上海大学 | Active dot matrix formula flexible electrode label apparatus |
| US20180279903A1 (en) * | 2012-09-07 | 2018-10-04 | Respiratory Motion, Inc. | Spacing of electrodes for bioimpedance measurements |
| FI20177042A1 (en) * | 2017-04-05 | 2018-10-06 | Tapani Kalervo Salmi | Selective method for multi-channel measurement, and equipment for electromyographic analysis |
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| US20020180605A1 (en) * | 1997-11-11 | 2002-12-05 | Ozguz Volkan H. | Wearable biomonitor with flexible thinned integrated circuit |
| US20180279903A1 (en) * | 2012-09-07 | 2018-10-04 | Respiratory Motion, Inc. | Spacing of electrodes for bioimpedance measurements |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110200627A (en) * | 2019-06-05 | 2019-09-06 | 上海大学 | A kind of active high-density electrode array and preparation method thereof |
| CN110200627B (en) * | 2019-06-05 | 2020-06-30 | 上海大学 | Active high-density electrode array and preparation method thereof |
| CN110311457A (en) * | 2019-08-02 | 2019-10-08 | 中山大学附属第三医院 | It is a kind of using skin pricktest as the portable storage battery of power supply |
| CN110311457B (en) * | 2019-08-02 | 2024-05-03 | 中山大学附属第三医院 | Portable storage battery using skin electricity as power supply |
| CN111289819A (en) * | 2020-04-09 | 2020-06-16 | 中山大学 | Integrated recording regulation and control system for measuring intracellular electric signals by myocardial cell electroporation |
| CN111289819B (en) * | 2020-04-09 | 2022-04-12 | 中山大学 | Integrated recording regulation and control system for measuring intracellular electric signals by myocardial cell electroporation |
| CN113093061A (en) * | 2021-04-22 | 2021-07-09 | 北京机械设备研究所 | Flexible array electrode on-off detection method based on sweep frequency screening |
| CN114098739A (en) * | 2021-11-08 | 2022-03-01 | 浙江大学 | Micro-needle array measuring system for electromyographic signal measurement |
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Application publication date: 20190104 |
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