CN206792404U - Ecg signal acquiring front end - Google Patents
Ecg signal acquiring front end Download PDFInfo
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- CN206792404U CN206792404U CN201720072711.9U CN201720072711U CN206792404U CN 206792404 U CN206792404 U CN 206792404U CN 201720072711 U CN201720072711 U CN 201720072711U CN 206792404 U CN206792404 U CN 206792404U
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- electrode
- upper limbs
- ecg signal
- lower limb
- signal acquiring
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Abstract
Present disclose provides a kind of ecg signal acquiring front end, including：First upper limbs electrode, the second upper limbs electrode, instrument amplifier and analog-digital converter, first upper limbs electrode and the second upper limbs electrode are connected by buffer with instrument amplifier respectively, and the output end of the instrument amplifier is connected to the input of the analog-digital converter.
Description
Technical field
A kind of this disclosure relates to ecg signal acquiring front end.
Background technology
Modern cardiac electricity detecting system is all divided into analog portion and numerical portion, traditional cardioelectric monitor system shown in Fig. 1
The module diagram of analog portion.As shown in figure 1, pass through bandpass filtering (including high-pass filtering, 50 Hz notch and low pass rate
Ripple), eliminate original electro-cardiologic signals in most of noise, and to analog-digital converter (ADC) input after filtering after signal.
But the processing of the filtering of this AFE(analog front end) part, especially its LPF and 50 Hz notch can cause circuit to be answered
It is miscellaneous, filter out the live part for originally belonging to electrocardiosignal, cause distorted signals and phase distortion, and increase cost.Meanwhile
These preposition hardware filters in itself also can generation circuit noise be superimposed upon in electrocardiosignal.As people are recognized electrocardiosignal
The intensification of knowledge and the development of digital processing technology, accordingly it is desirable to which obtaining one kind can still retain after analog-to-digital conversion
The signal of original electrocardiographicdigital composition, to contain original electro-cardiologic signals portion for the input of the digital processing part of Electro-cadiogram signals detector system
The data signal divided.
The content of the invention
In order to solve above mentioned problem of the prior art, the ecg signal acquiring front end of the disclosure, i.e. electricity detecting system
Analog portion removes the hardware filter, and the analog signal detected directly is input into ADC, airborne electromagnetic can be included in signal
The 50Hz Hz noises of coupling, equipment caused High-frequency Interference noise in itself, high frequency caused by the motion artifacts of human body and
Baseline interference artefact, while also remain original electrocardiosignal.
Therefore, present disclose provides a kind of ecg signal acquiring front end, including：First upper limbs electrode, the second upper limbs electrode,
Instrument amplifier and analog-digital converter, the first upper limbs electrode and the second upper limbs electrode pass through buffer and instrument amplifier respectively
It is connected, the output end of the instrument amplifier is connected to the input of the analog-digital converter.
According to the ecg signal acquiring front end of the disclosure, it also includes high-pass filter, the output of the instrument amplifier
End is connected to the input of the analog-digital converter by the high-pass filter.
According to the ecg signal acquiring front end of the disclosure, wherein also including the 3rd lower limb electrode and driven-right-leg circuit, pass through
The common-mode voltage for crossing the anti-phase processing of driven-right-leg circuit imports the lower limb of user through the 3rd lower limb electrode.
According to the ecg signal acquiring front end of the disclosure, wherein the high-pass filter filter out frequency for 0.05 hertz or its
Following signal is so as to eliminating baseline interference.
According to the ecg signal acquiring front end of the disclosure, wherein the first upper limbs electrode, the second upper limbs electrode, lower limb are soft
Property electrode is all disposed within three parts of a mattress so that user is crouching when on mattress, the first upper limbs electrode and the second upper limbs
Electrode contacts collection human ecg signal with human upper limb, and human body lower limbs contact lower limb flexible electrode to receive right leg drive
The inverted common-mode signal of circuit output.
According to the ecg signal acquiring front end of the disclosure, wherein the width of the lower limb flexible electrode can cover the complete of human body
Subordinate's limb.
According to the ecg signal acquiring front end of the disclosure, wherein the first upper limbs electrode, the second upper limbs electrode and lower limb are soft
Property electrode is silver fiber electrode.
Flexible electrode is utilized using the cardiac electricity detecting system of the disclosure, such as with conductive fabric, by uncorrelated
The upper limbs of mode and human body, including shirtfront, back, side etc., contacted to measure electrocardiosignal, while by the way that lower limb are electric
The signal of pole is input to detection circuit as drive signal and handled not as ground potential, can effectively reduce common mode letter
Number, improve CMRR.
According to the ecg signal acquiring front end of the disclosure, wherein the first upper limbs electrode, the second upper limbs electrode and lower limb are soft
Property electrode is rectangle and parallel to each other, and the first upper limbs electrode, the second upper limbs electrode and lower limb flexible electrode with it is described
The head of mattress is parallel.
According to the ecg signal acquiring front end of the disclosure, wherein characterized in that, on the first upper limbs electrode and second
Limb electrode width is 10 centimetres to 15 centimetres.
According to the ecg signal acquiring front end of the disclosure, wherein the first upper limbs electrode, the second upper limbs electrode and lower limb are soft
Property electrode it is adjacent between the two at intervals of 15 centimetres to 20 centimetres, compartment is made up of bafta.
Coupled using airborne electromagnetic field can be included in output digit signals behind the ecg signal acquiring front end according to the disclosure
50Hz Hz noises, equipment caused High-frequency Interference noise in itself, high frequency and baseline are done caused by the motion artifacts of human body
Artefact is disturbed, while also remains original electrocardiosignal., can be by the digital filtering system that appropriately designs after analog-to-digital conversion
System, the ratio between signal and noise are improved, while distortionless Hi-Fi electrocardiosignal can be provided.
Brief description of the drawings
Accompanying drawing herein is merged in specification and forms the part of this specification, shows the implementation for meeting the disclosure
Example, and be used to together with specification to explain the principle of the disclosure.
Shown in Fig. 1 is the module diagram of the fore-end of existing cardiac electricity detecting system.
Shown in Fig. 2 is the module according to the fore-end of the cardiac electricity detecting system using flexible lower limb electrode of the disclosure
Schematic diagram.
Shown in Fig. 3 is the fore-end using the cardiac electricity detecting system of flexible lower limb electrode according to the another kind of the disclosure
Module diagram
The ecg signal acquiring mattress electrode schematic diagram comprising flexible lower limb electrode according to the disclosure shown in Fig. 4.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the disclosure.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects be described in detail in claims, the disclosure.
It is only merely for the purpose of description specific embodiment in the term that the disclosure uses, and is not intended to be limiting and originally opens.
" one kind " of singulative used in disclosure and the accompanying claims book, " described " and "the" are also intended to including more number forms
Formula, unless context clearly shows that other implications.It is also understood that term "and/or" used herein refer to and comprising
The associated list items purposes of one or more any or all may combine.
It will be appreciated that though various information may be described using term first, second, third, etc. in the disclosure, such as
First electrocardioelectrode and the second electrocardioelectrode, but these information should not necessarily be limited by these terms, and the first electrocardioelectrode is referred to alternatively as
Two electrocardioelectrodes, vice versa.These terms are only used for same type of information being distinguished from each other out.Depending on linguistic context, such as exist
This used word " if " can be construed to " ... when " or " when ... " or " in response to determining ".
In order that those skilled in the art more fully understand the disclosure, with reference to the accompanying drawings and detailed description to this public affairs
Open and be described in further detail.
Shown in Fig. 2 is the module according to the fore-end of the cardiac electricity detecting system using flexible lower limb electrode of the disclosure
Schematic diagram.As shown in Fig. 2 a kind of ecg signal acquiring front end includes：First upper limbs electrode A, the second upper limbs electrode B, instrument are put
Big device and analog-digital converter ADC, the first upper limbs electrode A and the second upper limbs electrode B pass through buffer and instrument amplifier respectively
It is connected, the output end of the instrument amplifier is directly connected to the input of the analog-digital converter ADC, thus, is changed in ADC
After obtain more fully electrocardiosignal.Now, although the input signal composition received by ADC is extremely complex, but only that
Raising ADC conversion resolution ratio.The instrument amplifier has two inputs, one of input left upper extremity electrode
Lead signals, and the lead signals of another input input right upper extremity electrode.
As shown in Fig. 2 described buffer, when there is lead-fail detector, the input of buffer voltagc will by weak pull-up resistor
Input voltage is pulled upward to a higher voltage, therefore the output end of buffer circuit exports a higher voltage, when this
Individual voltage is higher than threshold voltage during lead-fail detector, with regard to that can judge lead-fail detector.When there is lead not come off, buffer voltagc
The input voltage of input pulls down to one than relatively low voltage, therefore the output end of buffer circuit exports one than relatively low electricity
Pressure, the threshold voltage when this voltage is less than lead-fail detector, with regard to that can judge that lead does not come off.
As shown in Fig. 2 also include the 3rd lower limb electrode and right leg drive electricity according to the ecg signal acquiring front end of the disclosure
Road, the common-mode voltage by the anti-phase processing of driven-right-leg circuit import the lower limb of user through the 3rd lower limb electrode.Buffer
The common-mode voltage gathered between output end is input into the reverse input end of driven-right-leg circuit, and human body is imported into after reversely
Lower limb, so as to offset common-mode voltage.Further, the output signal of driven-right-leg circuit is input into the lead inspection of upper limbs electrode
The input of slowdown monitoring circuit, so as to reduce the overall noise signal of each input.
Although describing the situation that instrument amplifier is directly connected to the analog-digital converter ADC above with reference to Fig. 2,
It can also be attached between instrument amplifier and the analog-digital converter ADC only by high-pass filter.Shown in Fig. 3
It is the module diagram according to the another kind of the disclosure using the fore-end of the cardiac electricity detecting system of flexible lower limb electrode.Such as figure
Shown in 3, a kind of ecg signal acquiring front end includes：First upper limbs electrode A, the second upper limbs electrode B, instrument amplifier and modulus
Converter ADC, the first upper limbs electrode A and the second upper limbs electrode B are connected by buffer with instrument amplifier respectively, the instrument
The output end of amplifier is connected to the input of the analog-digital converter ADC by the high-pass filter.The high-pass filtering
Device filters out signal that frequency is less than 0.05 hertz so as to eliminating baseline interference.
The ecg signal acquiring mattress electrode schematic diagram comprising flexible lower limb electrode according to the disclosure shown in Fig. 4.
As shown in figure 4, collection pad front as depicted is divided into five parts, Part I and Part III for conventional pure cotton cloth
Make, Part II A, Part IV B and Part VI C are silver fiber conductive fabric, as respectively as the first upper limbs flexible electrical
Pole A, the second upper limbs flexible electrode and lower limb flexible electrode, these electrodes can be silver fiber electrode.Silver fiber conductive fabric A
Upper limbs electrocardioelectrode can be used as with B, is arranged with conductive button, can be by the electrode part A of fiber conductive fabric and B from human body
The electric signal of upper collection detects circuit transmission to instrument amplifier via lead.Utilize the first upper limbs flexible electrode and the second upper limbs
Flexible electrode measures the electrocardiosignal of human body.First upper limbs flexible electrode and the second upper limbs flexible electrode may be constructed an electricity
Hold, the electrocardio current potential of the two capacitive coupling body surface.When being padded using electrocardiogram acquisition, user, which generally couches, makes heart be located at first
Position between upper limbs flexible electrode and the second upper limbs flexible electrode, so that the first upper limbs flexible electrode and the second upper limbs are flexible
The potential difference of upper and lower two positions of electrode measurement heart.Because electrocardiosignal signal intensity is weak, easily it is disturbed, so, after
Electrocardiosignal is further processed the signal processor that face refers to.For example, first, the first upper limbs flexible electrode will be come from
It is amplified with the electrocardiosignal of the second upper limbs flexible electrode.Then, amplified signal is filtered, made an uproar with removing interference
Sound simultaneously generates effective electrocardiosignal.
In order to adapt to the collection of human chest electrocardiosignal and leg signal, the first upper limbs flexible electrode A and
Two upper limbs flexible electrode B width are 7 centimetres to 15 centimetres.Because, on the one hand, the first upper limbs flexible electrode and the second upper limbs
Flexible electrode needs the both ends for being located at user's heart respectively when in use, and the distance of the upper end of heart and shoulder is limited.
So the width of electrode is limited by this distance.On the other hand, within the specific limits, the width of electrode is wider, then electrode with
The contact area of human body is bigger, and waveform is more clear, no clutter.For example, the width of electrode is less than 7 centimetres, then mattress is gathered
Crest value is likely less than 1.0 volts, and the measurement validity to electrocardiosignal parameter is caused to perplex by this.Another further aspect, electrode
Width is wider, then needs more materials to manufacture electrode, and which increase the manufacturing cost of collection pad.Weigh measurement result with into
This, the width of the width of the first upper limbs flexible electrode and the second upper limbs flexible electrode may be selected to be 7 centimetres to 15 centimetres.It is optional
The width of ground, the width of the first upper limbs flexible electrode and the second upper limbs flexible electrode is identical.Inventor measures discovery by actual,
The crest value gathered when the first upper limbs flexible electrode of electrocardiogram acquisition pad and the second upper limbs flexible electrode width are by 9 centimetres is about
For 1.7 volts, and it is enough for measurement of the value for heart physiological parameter.In addition, the first upper limbs flexible electrode and
If the width of two upper limbs flexible electrodes continues to increase from 12 centimetres, crest value does not dramatically increase correspondingly.It is excellent based on this
The width of selection of land, the width of the first upper limbs flexible electrode and the second upper limbs flexible electrode, which is 9 centimetres to 12 centimetres, to be advisable.Therefore,
The width of first upper limbs flexible electrode and the second upper limbs flexible electrode is preferably 12 centimetres.
As shown in figure 4, the first upper limbs flexible electrode, the second upper limbs flexible electrode and lower limb flexible electrode it is adjacent both
Between at intervals of 15 centimetres to 20 centimetres, the compartment is made up of bafta.Theoretical and experimental data shows, on first
The measurement of electrocardiosignal of the distance at the interval of limb flexible electrode and the second upper limbs flexible electrode between the two for being gathered has
Have a significant impact.Gather electrocardiosignal the first upper limbs flexible electrode and the second upper limbs flexible electrode respectively positioned at heart it is upper,
The signal quality that lower both ends obtain is best.Being spaced wide either narrow can cause that signal noise is too many or wave amplitude is too small.Electrocardio
The interval preferred distance gathered between the electrode of pad compares the cardiac size for being adapted to most people for 15 centimetres, in this distance
Under, the crest of the waveform of the electrocardiosignal of collection is obvious, and signal to noise ratio is big.
In addition, the length of the first upper limbs flexible electrode, the second upper limbs flexible electrode and lower limb flexible electrode is 70
Centimetre to 100 centimetres, preferably 90 centimetre lengths.As described above, human ecg signal is a kind of weak electric signal.Electrocardiosignal leads to
It can often be disturbed by various noises, such as the interference of human motion.In the present embodiment, on the first upper limbs flexible electrode and second
Limb flexible electrode is rectangle and is an entirety respectively.This allow human body collection pad on turn over, while keep human body with
First upper limbs flexible electrode and the second upper limbs flexible electrode have larger area contact.First upper limbs flexible electrode and the second upper limbs
Flexible electrode is parallel to each other, and the first upper limbs flexible electrode and the second upper limbs flexible electrode are parallel with the head of collection pad.This
So that the interval holding between the first upper limbs flexible electrode and the second upper limbs flexible electrode is constant.So in domestic consumer this
The collection for also not interfering with electrocardiosignal is turned over when sleep on collection pad.The accuracy of measurement result has been effectively ensured.
Part VI C can be used as leg driving electrodes.Silver fiber as the acquisition electrode of electrocardiogram acquisition circuit is conductive
Cloth A, B and C have larger area, and therefore, the signal intensity of collection will be bigger, and signal is more stable.
In addition, the first upper limbs flexible electrode and the second upper limbs flexible electrode can include silver fiber conductive fabric, can also
Corronil fiber conductive fabric.Conductive fabric is conductor, can play a part of potential difference signal measurement.Conductive fabric is not
Only and because conductive fabric is relatively thin, and can have toughness with human body capacitive coupling, its can also physically with
Collection pad body is preferably bonded, and collection pad can be caused to have more comfortableness.In order that user lie in it is more easypro on the collection pad
Suitable, the first upper limbs flexible electrode, the second upper limbs flexible electrode, the silver fiber of lower limb flexible electrode and the host conductive cloth are led
The thickness of electric cloth is 0.5 millimeter to 1.2 millimeters, preferably 1 millimeter, can the electric conductivity and can of holding electrode enough keep sheet
Pliability.
Processing for the ADC signals exported, generally use digital filtering mode are handled, so as to filter out noise letter
Number, obtain electrocardiosignal in itself.The means of generally use have Kalman filter, Wenner filtering, adaptive-filtering, wavelet transformation
Etc. (wavelet) means, these means can be achieved on a digital device.Here digital device is not only comprising calculating
Machine, also embedded device are such as：DSP, FPGA, ARM, MCU etc..In view of the disclosure is not changing in itself for digital filtering
Enter, therefore the process of digital filtering is not described in detail herein.
In summary, according to the ecg signal acquiring front end of the disclosure because the output end of the instrument amplifier directly connects
The output end of the input or the instrument amplifier that are connected to the analog-digital converter is connected to only by high-pass filter
The input of the analog-digital converter ADC, therefore electrocardio letter is remained in ADC transformation result data signal as completely as possible
Number composition, therefore electrocardiosignal after treatment will be more complete and be not easy distortion.
The general principle of the disclosure is described above in association with specific embodiment, however, it is desirable to, it is noted that to this area
For those of ordinary skill, it is to be understood that disclosed method and the whole either any steps or part of device, Ke Yi
In any computing device (including processor, storage medium etc.) or the network of computing device, with hardware, firmware, software or
Combinations thereof is realized that this is that those of ordinary skill in the art use them in the case where having read the explanation of the disclosure
Basic programming skill can be achieved with.
Therefore, the purpose of the disclosure can also by run on any computing device a program or batch processing come
Realize.The computing device can be known fexible unit.Therefore, the purpose of the disclosure can also include only by offer
The program product of the program code of methods described or device is realized to realize.That is, such program product is also formed
The disclosure, and the storage medium for being stored with such program product also forms the disclosure.Obviously, the storage medium can be
Any known storage medium or any storage medium developed in the future.
It may also be noted that in the apparatus and method of the disclosure, it is clear that each part or each step are to decompose
And/or reconfigure.These decompose and/or reconfigured the equivalents that should be regarded as the disclosure.Also, perform above-mentioned series
The step of processing can order naturally following the instructions perform in chronological order, but and need not necessarily sequentially in time
Perform.Some steps can perform parallel or independently of one another.
Above-mentioned embodiment, the limitation to disclosure protection domain is not formed.Those skilled in the art should be bright
It is white, depending on design requirement and other factors, various modifications, combination, sub-portfolio and replacement can occur.It is any
Modifications, equivalent substitutions and improvements made within the spirit and principle of the disclosure etc., should be included in disclosure protection domain
Within.
Claims (10)
1. a kind of ecg signal acquiring front end, including：First upper limbs electrode, the second upper limbs electrode, instrument amplifier and modulus
Converter, it is characterised in that the first upper limbs electrode and the second upper limbs electrode are connected by buffer with instrument amplifier respectively, institute
The output end for stating instrument amplifier is connected to the input of the analog-digital converter.
2. ecg signal acquiring front end according to claim 1, it is characterised in that also including high-pass filter, the instrument
The output end of amplifier is connected to the input of the analog-digital converter by the high-pass filter.
3. ecg signal acquiring front end according to claim 1, it is characterised in that also including the 3rd lower limb electrode and right leg
Drive circuit, the common-mode voltage by the anti-phase processing of driven-right-leg circuit import the lower limb of user through the 3rd lower limb electrode.
4. ecg signal acquiring front end according to claim 2, it is characterised in that the high-pass filter filters out frequency and is
0.05 hertz or less of signal is so as to eliminating baseline interference.
5. ecg signal acquiring front end according to claim 4, it is characterised in that the first upper limbs electrode, the second upper limbs
Electrode, lower limb flexible electrode are all disposed within three parts of a mattress so that user is crouching when on mattress, the first upper limbs electrode
Collection human ecg signal is contacted with human upper limb with the second upper limbs electrode, and human body lower limbs contact lower limb flexible electrode to connect
Receive the inverted common-mode signal of driven-right-leg circuit output.
6. ecg signal acquiring front end according to claim 5, it is characterised in that the width of the lower limb flexible electrode can
Cover whole lower limb of human body.
7. ecg signal acquiring front end according to claim 6, it is characterised in that the first upper limbs electrode, the second upper limbs electricity
Pole and lower limb flexible electrode are silver fiber electrode.
8. ecg signal acquiring front end according to claim 7, it is characterised in that the first upper limbs electrode, the second upper limbs electricity
Pole and lower limb flexible electrode are rectangles and parallel to each other, and the first upper limbs electrode, the second upper limbs electrode and lower limb
Flexible electrode is parallel with the head of the mattress.
9. ecg signal acquiring front end as claimed in claim 8, it is characterised in that the first upper limbs electrode and the second upper limbs
Electrode width is 10 centimetres to 15 centimetres.
10. ecg signal acquiring front end as claimed in claim 9, it is characterised in that the first upper limbs electrode, the second upper limbs electrode,
And lower limb flexible electrode it is adjacent between the two at intervals of 15 centimetres to 20 centimetres, compartment is made up of bafta.
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| CN201720072711.9U CN206792404U (en) | 2017-01-20 | 2017-01-20 | Ecg signal acquiring front end |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106510691A (en) * | 2017-01-20 | 2017-03-22 | 深圳诺康医疗设备股份有限公司 | Electrocardiograph signal acquisition front end |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106510691A (en) * | 2017-01-20 | 2017-03-22 | 深圳诺康医疗设备股份有限公司 | Electrocardiograph signal acquisition front end |
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Address after: 518057 Guangdong city of Shenzhen province Nanshan District science and technology eight South Road No. 2 building 7E-b Howell Technology Patentee after: Shenzhen Nuokang Medical Technology Co., Ltd Address before: 518057 Guangdong city of Shenzhen province Nanshan District science and technology eight South Road No. 2 building 7E-b Howell Technology Patentee before: SHENZHEN NUOKANG MEDICAL EQUIPMENT Co.,Ltd. |