CN106510691A - Electrocardiograph signal acquisition front end - Google Patents
Electrocardiograph signal acquisition front end Download PDFInfo
- Publication number
- CN106510691A CN106510691A CN201710042893.XA CN201710042893A CN106510691A CN 106510691 A CN106510691 A CN 106510691A CN 201710042893 A CN201710042893 A CN 201710042893A CN 106510691 A CN106510691 A CN 106510691A
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- China
- Prior art keywords
- electrode
- upper limb
- ecg signal
- signal acquiring
- acquiring front
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Classifications
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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
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
-
- 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
- A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
- A61B5/282—Holders for multiple electrodes
-
- 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
- A61B5/30—Input circuits therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
Abstract
The invention provides an electrocardiograph signal acquisition front end which comprises a first upper limb electrode, a second upper limb electrode, an instrument amplifier and an analog-digital converter. The first upper limb electrode and the second upper limb electrode are respectively connected with the instrument amplifier by buffers, and an output end of the instrument amplifier is connected to an input end of the analog-digital converter.
Description
Technical field
It relates to a kind of ecg signal acquiring front end.
Background technology
Modern cardiac electricity detecting system is all divided into analog portion and numerical portion, the traditional cardioelectric monitor system shown in Fig. 1
The module diagram of analog portion.As shown in figure 1, (including high-pass filtering, 50 Hz notch and low pass rate by bandpass filtering
Ripple), eliminate the most of noise in original electro-cardiologic signals, and the signal after being input into after filtering to analog-digital converter (ADC).
But comprehending at the filtering of this AFE (analog front end) part, especially its low-pass filtering and 50 Hz notch causes circuit multiple
It is miscellaneous, leach the live part for originally belonging to electrocardiosignal, cause distorted signals and phase distortion, and increase cost.Meanwhile,
These preposition hardware filters itself can also produce circuit noise and be superimposed upon in electrocardiosignal.As people are recognized to electrocardiosignal
The intensification of knowledge and the development of digital processing technology, accordingly it is desirable to obtain one kind can still retain after analog digital conversion
The signal of original electrocardiographicdigital composition, so that the digital processing part input for Electro-cadiogram signals detector system is containing original electro-cardiologic signals portion
The digital signal for dividing.
The content of the invention
In order to solve the problems referred to above 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 analogue signal for being detected is input to ADC directly, and airborne electromagnetic can be included in signal
The 50Hz Hz noises of coupling, the High-frequency Interference noise of equipment generation itself, high frequency that the motion artifacts of human body are caused and
Baseline interference artefact, while also remaining original electrocardiosignal.
For this purpose, present disclose provides a kind of ecg signal acquiring front end, including：First upper limb electrode, the second upper limb electrode,
Instrument amplifier and analog-digital converter, the first upper limb electrode and the second upper limb electrode pass through buffer and instrument amplifier respectively
It is connected, the outfan 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, which 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, Jing
Cross the lower limb that the 3rd lower limb electrode described in the common-mode voltage Jing of the anti-phase process of driven-right-leg circuit imports user.
According to the ecg signal acquiring front end of the disclosure, wherein the high pass filter leaches frequency for 0.05 hertz or which
Signal below is so as to eliminating baseline interference.
According to the ecg signal acquiring front end of the disclosure, wherein the first upper limb electrode, the second upper limb electrode, lower limb are soft
Property electrode is all disposed within three parts of a mattress so that user when crouching on mattress, the first upper limb electrode and the second upper limb
Electrode contacts collection human ecg signal, and human body lower limbs contact lower limb flexible electrode to receive right leg drive with human upper limb
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 limb electrode, the second upper limb electrode and lower limb are soft
Property electrode be 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 limb of mode and human body, including shirtfront, back, side etc., carry out contact to measure electrocardiosignal, while by lower limb are electric
The signal of pole is input to detection circuit as drive signal and is processed 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 limb electrode, the second upper limb electrode and lower limb are soft
Property electrode is rectangle and parallel to each other, and the first upper limb electrode, the second upper limb 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 limb 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 limb electrode, the second upper limb 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.
Can couple comprising airborne electromagnetic field using in output digit signals behind the ecg signal acquiring front end according to the disclosure
50Hz Hz noises, the High-frequency Interference noise that equipment itself is produced, the high frequency and baseline that the motion artifacts of human body are caused are dry
Artefact is disturbed, while also remaining original electrocardiosignal.The digital filtering system of appropriate design after analog digital conversion, can be passed through
System, improves the ratio of signal and noise, while distortionless Hi-Fi electrocardiosignal can be provided.
Description of the drawings
During accompanying drawing herein is merged in description and the part of this specification is constituted, show the enforcement for meeting the disclosure
Example, and be used for explaining the principle of the disclosure together with description.
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 of the fore-end of the cardiac electricity detecting system using flexible lower limb electrode according to the disclosure
Schematic diagram.
Shown in Fig. 3 is the fore-end according to the another kind of the disclosure using the cardiac electricity detecting system of flexible lower limb electrode
Module diagram
The ecg signal acquiring mattress electrode schematic diagram comprising flexible lower limb electrode according to the disclosure shown in Fig. 4.
Specific embodiment
Here in detail exemplary embodiment will be illustrated, its example is illustrated in the accompanying drawings.Explained below 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.Conversely, they be only with as appended by
The example of consistent apparatus and method in terms of some described in detail in claims, the disclosure.
The disclosure using term be purpose only merely for description specific embodiment, and be not intended to be limiting and originally open.
" one kind ", " described " and " being somebody's turn to do " of singulative used in disclosure and the accompanying claims book is also intended to include many number forms
Formula, unless context clearly shows that other implications.It is also understood that term "and/or" used herein is referred to and is included
What one or more were associated lists any or all possible combination of project.
It will be appreciated that though various information may be described using term first, second, third, etc. in the disclosure, for example
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 for same type of information is distinguished from each other out.Depending on linguistic context, such as exist
Word that this is used " 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 of the fore-end of the cardiac electricity detecting system using flexible lower limb electrode according to the disclosure
Schematic diagram.As shown in Fig. 2 a kind of ecg signal acquiring front end includes：First upper limb electrode A, the second upper limb electrode B, instrument are put
Big device and analog-digital converter ADC, the first upper limb electrode A and the second upper limb electrode B pass through buffer and instrument amplifier respectively
It is connected, the outfan of the instrument amplifier is directly connected to the input of the analog-digital converter ADC, thus, changes 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.The instrument amplifier has two inputs, one of input left upper extremity electrode
Lead signals, and another input is input into the lead signals of right upper extremity electrode.
As shown in Fig. 2 described buffer is when there is lead-fail detector, the input of buffer voltagc will by weak pull-up resistor
Input voltage is pulled upward to the high voltage of comparison, therefore the outfan of buffer circuit exports the high voltage of a comparison, when this
Threshold voltage when individual voltage is higher than lead-fail detector, can just 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 outfan of buffer circuit exports one than relatively low electricity
Pressure, the threshold voltage when this voltage is less than lead-fail detector, can just judge that lead does not come off.
As shown in Fig. 2 also including the 3rd lower limb electrode and right leg drive electricity according to the ecg signal acquiring front end of the disclosure
Road, the 3rd lower limb electrode described in the common-mode voltage Jing through the anti-phase process of driven-right-leg circuit import the lower limb of user.Buffer
The common-mode voltage gathered between outfan is imported into the reverse input end of driven-right-leg circuit, after reversely imports to human body
Lower limb, so as to offset common-mode voltage.Further, the output signal of driven-right-leg circuit is imported into the lead inspection of upper limb 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,
Can also be attached only by high pass filter between instrument amplifier and the analog-digital converter ADC.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.As schemed
Shown in 3, a kind of ecg signal acquiring front end includes：First upper limb electrode A, the second upper limb electrode B, instrument amplifier and modulus
Transducer ADC, the first upper limb electrode A and the second upper limb electrode B are connected with instrument amplifier by buffer respectively, the instrument
The outfan of amplifier is connected to the input of the analog-digital converter ADC by the high pass filter.The high-pass filtering
Device leach frequency for 0.05 hertz of signal below so as to eliminate 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 are conventional pure cotton cloth
Make, Part II A, Part IV B and Part VI C are silver fiber conductive fabric, used as respectively as the first upper limb flexible electrical
Pole A, the second upper limb flexible electrode and lower limb flexible electrode, these electrodes can be silver fiber electrode.Silver fiber conductive fabric A
Conductive button can be arranged with as upper limb electrocardioelectrode with B, can be by the electrode part A of fiber conductive fabric and B from human body
The signal of telecommunication of upper collection detects circuit transmission to instrument amplifier via lead.Using the first upper limb flexible electrode and the second upper limb
Flexible electrode is measuring the electrocardiosignal of human body.First upper limb flexible electrode and the second upper limb flexible electrode may be constructed one it is electric
Hold, the electrocardio current potential of the two capacitive coupling body surface.When using electrocardiogram acquisition pad, user generally couches makes heart be located at first
Position between upper limb flexible electrode and the second upper limb flexible electrode, so that the first upper limb flexible electrode and the second upper limb 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, using after
The signal processor that face refers to is further processed to electrocardiosignal.For example, first, will be from the first upper limb flexible electrode
It is amplified with the electrocardiosignal of the second upper limb flexible electrode.Then, amplified signal is filtered, is 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 limb flexible electrode A and
Two upper limb flexible electrode B width are 7 centimetres to 15 centimetres.This is because, on the one hand, the first upper limb flexible electrode and the second upper limb
Flexible electrode is needed when in use respectively positioned at the two ends of user's heart, and the upper end of heart is limited with the distance of shoulder.
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, without 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 effectiveness to electrocardiosignal parameter is caused puzzlement by this.Another further aspect, electrode
Width is wider, then need more materials to manufacture electrode, which increases the manufacturing cost of collection pad.Balance measurement result with into
This, the width of the width of the first upper limb flexible electrode and the second upper limb 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 limb flexible electrode and the second upper limb flexible electrode is identical.Inventor measures discovery through actual,
The crest value gathered when the first upper limb flexible electrode and the second upper limb flexible electrode width of electrocardiogram acquisition pad are by 9 centimetres is about
For 1.7 volts, and the value is enough for the measurement of heart physiological parameter.Additionally, the first upper limb flexible electrode and
If the width of two upper limb flexible electrodes continues increase from 12 centimetres, crest value is not correspondingly dramatically increased.It is based on this, excellent
The width of selection of land, the width of the first upper limb flexible electrode and the second upper limb flexible electrode is advisable for 9 centimetres to 12 centimetres.Therefore,
The width of the first upper limb flexible electrode and the second upper limb flexible electrode is preferably 12 centimetres.
As shown in figure 4, the first upper limb flexible electrode, the second upper limb 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 for the electrocardiosignal for being gathered spaced apart between the two of limb flexible electrode and the second upper limb flexible electrode has
Have a significant impact.Collection electrocardiosignal the first upper limb flexible electrode and the second upper limb flexible electrode respectively positioned at heart it is upper,
The signal quality that lower two ends obtain is best.Interval is wide or narrow signal noise can be caused too many or wave amplitude is too little.Electrocardio
Interval preferred distance between the electrode of collection pad is 15 centimetres and compares the cardiac size for being adapted to most people, in this distance
Under, substantially, signal to noise ratio is big for the crest of the waveform of the electrocardiosignal of collection.
Additionally, the length of the first upper limb flexible electrode, the second upper limb 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 is led to
Often can be disturbed by various noises, the interference of such as human motion.In the present embodiment, on the first upper limb flexible electrode and second
Limb flexible electrode is rectangle and is an entirety respectively.This allow human body collection pad on stand up, while keep human body with
There is larger area to contact for first upper limb flexible electrode and the second upper limb flexible electrode.First upper limb flexible electrode and the second upper limb
Flexible electrode is parallel to each other, and the first upper limb flexible electrode and the second upper limb flexible electrode are parallel with the head of collection pad.This
So that the interval holding between the first upper limb flexible electrode and the second upper limb flexible electrode is constant.So in domestic consumer this
The collection for also not interfering with electrocardiosignal is stood up when sleep on collection pad.The accuracy of measurement result has been effectively ensured.
Part VI C can be used as leg drive electrode.It is conductive as the silver fiber of the acquisition electrode of electrocardiogram acquisition circuit
Cloth A, B and C have larger area, therefore, the signal intensity of collection will be bigger, and signal is more stable.
Additionally, the first upper limb flexible electrode and the second upper limb flexible electrode can include silver fiber conductive fabric, it is also possible to
Corronil fiber conductive fabric.Conductive fabric is conductor, can play a part of potential difference signal measurement.Conductive fabric is not
Only can with human body capacitive coupling, and because conductive fabric it is relatively thin, and have toughness, its can also physically with
Collection pad body is preferably fitted, 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 silver fiber of the first upper limb flexible electrode, the second upper limb flexible electrode, lower limb flexible electrode and the host conductive cloth is led
The thickness of electric cloth is 0.5 millimeter to 1.2 millimeters, preferably 1 millimeter, can the electric conductivity of holding electrode can keep sheet again
Pliability.
For the process of the signal exported by ADC, generally processed using digital filtering mode, so as to leach noise letter
Number, obtain electrocardiosignal itself.The means for generally adopting have Kalman filter, Wenner filtering, adaptive-filtering, wavelet transformation
(wavelet) means such as, 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 for digital filtering itself
Enter, therefore here is not described in detail the process of digital filtering.
In sum, according to the ecg signal acquiring front end of the disclosure as the outfan of the instrument amplifier directly connects
The outfan for being connected to the input or the instrument amplifier of the analog-digital converter is connected to only by high pass filter
The input of the analog-digital converter ADC, therefore electrocardio letter in the transformation result digital signal of ADC, is remained as completely as possible
Number composition, therefore electrocardiosignal after treatment will be more complete and be difficult distortion.
The ultimate 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 whole or any steps or part of disclosed method and 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 the explanation of the disclosure has been read
Basic programming skill can be achieved with.
Therefore, the purpose of the disclosure can also by a program or batch processing are run on any computing device come
Realize.The computing device can be known fexible unit.Therefore, the purpose of the disclosure can also be included only by offer
Realize the program product of program code of methods described or device realizing.That is, such program product is also constituted
The disclosure, and the storage medium of such program product that is stored with also constitutes the disclosure.Obviously, the storage medium can be
Any known storage medium or any storage medium for being 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 can be to decompose
And/or reconfigure.These decompose and/or reconfigure the equivalents that should be regarded as the disclosure.Also, perform above-mentioned series
The step of process can order naturally following the instructions perform in chronological order, but and need not necessarily sequentially in time
Perform.Some steps can be performed parallel or independently of one another.
Above-mentioned specific embodiment, does not constitute the restriction to disclosure protection domain.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
Modification, equivalent and improvement 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 limb electrode, the second upper limb electrode, instrument amplifier and modulus
Transducer, the first upper limb electrode and the second upper limb electrode are connected with instrument amplifier by buffer respectively, and the instrument is amplified
The outfan of device is connected to the input of the analog-digital converter.
2. ecg signal acquiring front end according to claim 1, which also includes high pass filter, the instrument amplifier
Outfan 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, wherein also including the 3rd lower limb electrode and right leg drive electricity
Road, the 3rd lower limb electrode described in the common-mode voltage Jing through the anti-phase process of driven-right-leg circuit import the lower limb of user.
4. ecg signal acquiring front end according to claim 3, wherein the high pass filter leaches frequency for 0.05 hertz
Hereby or signal below is so as to eliminating baseline interference.
5. ecg signal acquiring front end according to claim 4, wherein the first upper limb electrode, the second upper limb electrode,
Lower limb flexible electrode is all disposed within three parts of a mattress so that user when crouching on mattress, the first upper limb electrode and
Two upper limb electrodes contact collection human ecg signal, and human body lower limbs contact lower limb flexible electrode to receive the right side with human upper limb
The inverted common-mode signal of lower limb drive circuit output.
6. ecg signal acquiring front end according to claim 5, wherein the width of the lower limb flexible electrode can cover people
Whole lower limb of body.
7. ecg signal acquiring front end according to claim 6, wherein the first upper limb electrode, the second upper limb electrode and
Lower limb flexible electrode is silver fiber electrode.
8. ecg signal acquiring front end according to claim 7, wherein the first upper limb electrode, the second upper limb electrode and
Lower limb flexible electrode is rectangle and parallel to each other, and the first upper limb electrode, the second upper limb electrode and lower limb flexible electrode
It is parallel with the head of the mattress.
9. ecg signal acquiring front end as claimed in claim 8, wherein the first upper limb electrode and the second upper limb electrode width
Spend for 10 centimetres to 15 centimetres.
10. ecg signal acquiring front end as claimed in claim 9, wherein the first upper limb electrode, the second upper limb electrode and under
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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| CN201710042893.XA CN106510691A (en) | 2017-01-20 | 2017-01-20 | Electrocardiograph signal acquisition front end |
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| CN201710042893.XA CN106510691A (en) | 2017-01-20 | 2017-01-20 | Electrocardiograph signal acquisition front end |
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| CN107296599A (en) * | 2017-05-16 | 2017-10-27 | 武汉思创电子有限公司 | A kind of multi leads ECG signal condition and data acquisition circuit |
| CN109222957A (en) * | 2018-08-29 | 2019-01-18 | 西安电子科技大学 | A kind of automation ECG measuring system |
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| CN114938781A (en) * | 2022-05-26 | 2022-08-26 | 浙江理工大学 | Device for detecting and judging health relationship between barrier environment and experimental animal |
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Application publication date: 20170322 |