CN206372061U - A kind of lungs sound difference signal Acquisition Circuit and lungs sound difference auscultation apparatus - Google Patents
A kind of lungs sound difference signal Acquisition Circuit and lungs sound difference auscultation apparatus Download PDFInfo
- Publication number
- CN206372061U CN206372061U CN201621134763.6U CN201621134763U CN206372061U CN 206372061 U CN206372061 U CN 206372061U CN 201621134763 U CN201621134763 U CN 201621134763U CN 206372061 U CN206372061 U CN 206372061U
- Authority
- CN
- China
- Prior art keywords
- signal
- acquisition circuit
- lungs sound
- signal acquisition
- sound difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The utility model embodiment provides a kind of lungs sound difference signal Acquisition Circuit and lungs sound difference auscultation apparatus, and the lungs sound difference signal Acquisition Circuit includes signal acquisition circuit, signal output apparatus and signal amplification circuit.The input of signal acquisition circuit is connected with external signal transmitting terminal, the input of output end and signal output apparatus is connected, and the output end of signal output apparatus and the input of signal amplification circuit are connected.Signal acquisition circuit generates voltage signal after the Lung Sounds that external signal transmitting terminal is sent are changed and sends it to signal output apparatus.Signal output apparatus sends the voltage signal received to signal amplification circuit.Signal amplification circuit generates amplified signal and exported after the voltage signal received is amplified.The lungs sound difference signal Acquisition Circuit realizes collection, conversion and the enhanced processing of the faint Lung Sounds sent to outside signal sending end, is that the follow-up processing for carrying out Lung Sounds provides the foundation.
Description
Technical field
The utility model is related to medical instruments field, in particular to a kind of lungs sound difference signal Acquisition Circuit and lung
The different auscultation apparatus of beat.
Background technology
Lungs sound is the general name for the sound that respiratory system is produced in scavenging period, contains pathology, the life of respiratory system
Information of science.In recent years, the development with electronic technology and the raising of the further understanding to lungs sound, the auscultation of lungs sound turn into
An indispensable link in clinical detection.Differentiation auscultation apparatus can help medical worker quickly to catch the exception of lungs sound
Situation, with preferable application potential.Differentiation auscultation apparatus needs to gather the lung on two diverse locations on patient's wall of the chest
Sound, to carry out subtraction operation, and the collection of lungs sound depends on electret capcitor microphone.Study and find through inventor, electret
The output signal voltage of body capacitance formula microphone is relatively low, and the special collection of existing differentiation auscultation apparatus shortage and amplification electricity
Road.Therefore, how to be acquired, change and enhanced processing for Lung Sounds, subsequently Lung Sounds are handled with facilitating
The problem of it is urgently to be resolved hurrily.
Utility model content
In view of this, the purpose of the utility model embodiment is that there is provided a kind of lungs sound difference signal Acquisition Circuit and lung
The different auscultation apparatus of beat is to solve the above problems.
The utility model preferred embodiment provide a kind of lungs sound difference signal Acquisition Circuit, including signal acquisition circuit,
Signal output apparatus and signal amplification circuit, input and external signal the transmitting terminal electric connection of the signal acquisition circuit,
Output end and the input of the signal output apparatus are electrically connected with, and the output end of the signal output apparatus is put with the signal
The input of big circuit is electrically connected with；
The signal acquisition circuit is used to generate after changing the Lung Sounds that the external signal transmitting terminal is sent
Voltage signal, and the voltage signal is sent to the signal output apparatus；
The signal output apparatus is used to send the voltage signal received to the signal amplification circuit；
The signal amplification circuit is used to generate amplified signal after the voltage signal received is amplified into processing,
And exported the amplified signal.
Further, the signal acquisition circuit includes acoustic-electric conversion sensor, the signal of the acoustic-electric conversion sensor
Input is electrically connected with the external signal transmitting terminal, output end and the input of the signal output apparatus are electrically connected with.
Further, the acoustic-electric conversion sensor is electret capacitor microphone.
Further, the signal output apparatus include pull-up resistor and capacitance, one end of the pull-up resistor and
The output end of the electret capacitor microphone is electrically connected with, another termination power, one end of the capacitance and described is stayed
The output end of electret condenser microphone is electrically connected with, the input of the other end and the signal amplification circuit is electrically connected with.
Further, the signal amplification circuit includes operational amplifier, pull down resistor and feedback resistance；
The normal phase input end of one end of the pull down resistor and the operational amplifier is electrically connected with, other end ground connection, institute
Feedback resistance is stated to be electrically connected between the normal phase input end of the operational amplifier and output end, the operational amplifier it is anti-
Phase input is electrically connected with the capacitance.
Further, the lungs sound difference signal Acquisition Circuit also include RC wave filters, one end of the RC wave filters with
The pull-up resistor is electrically connected with, another termination power.
Further, the RC wave filters include current-limiting resistance and filter capacitor, one end of the current-limiting resistance with it is described
Pull-up resistor is electrically connected with, another termination power, one end of the filter capacitor and the pull-up resistor and the current-limiting resistance
It is electrically connected, the other end is grounded.
Further, the capacitance is non-polar condenser, and the filter capacitor is electrolytic capacitor.
Further, the operational amplifier is LM358 dual operational amplifiers.
Another preferred embodiment of the utility model provide a kind of lungs sound difference auscultation apparatus, including lungs sound harvester,
Microcontroller and above-mentioned lungs sound difference signal Acquisition Circuit, the lungs sound difference signal Acquisition Circuit are electrically connected at the lungs sound
Between harvester and the microcontroller.
The utility model embodiment provides a kind of lungs sound difference signal Acquisition Circuit and lungs sound difference auscultation apparatus.It is described
Lungs sound difference signal Acquisition Circuit includes signal acquisition circuit, signal output apparatus and signal amplification circuit.The signal acquisition
The input of circuit is electrically connected with external signal transmitting terminal, output end and the input of the signal output apparatus electrically connect
Connect.The output end of the signal output apparatus and the input of the signal amplification circuit are electrically connected with.The signal acquisition electricity
The Lung Sounds that external signal transmitting terminal is sent are converted to voltage signal and send it to the signal output apparatus by road.Institute
Signal output apparatus is stated to send the voltage signal to the signal amplification circuit.The signal amplification circuit is by the voltage
Signal, which is amplified after processing, to be generated amplified signal and outputs it.The lungs sound difference signal Acquisition Circuit is realized to outside letter
Collection, conversion and the enhanced processing for the faint Lung Sounds that number transmitting terminal is sent, are that the follow-up processing for carrying out Lung Sounds is carried
Basis is supplied.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the utility model embodiment, it will use below required in embodiment
Accompanying drawing be briefly described.It should be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should not be by
Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also
To obtain other related accompanying drawings according to these accompanying drawings.
A kind of structured flowchart for lungs sound difference signal Acquisition Circuit that Fig. 1 provides for the utility model preferred embodiment.
A kind of schematic diagram for lungs sound difference signal Acquisition Circuit that Fig. 2 provides for the utility model preferred embodiment.
A kind of another principle for lungs sound difference signal Acquisition Circuit that Fig. 3 provides for the utility model preferred embodiment
Figure.
A kind of structured flowchart for lungs sound difference signal auscultation apparatus that Fig. 4 provides for the utility model preferred embodiment.
Icon：10- lungs sound difference signal Acquisition Circuits；100- signal acquisition circuits；200- signal output apparatus；300- believes
Number amplifying circuit；400-RC wave filters；20- lungs sound harvesters；30- microcontrollers.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe.Obviously, described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.The component for the utility model embodiment being generally described and illustrated herein in the accompanying drawings can be with a variety of configurations
To arrange and design.Therefore, the detailed description of embodiment of the present utility model below to providing in the accompanying drawings is not intended to limit
The claimed scope of the present utility model of system, but it is merely representative of selected embodiment of the present utility model.It is new based on this practicality
The embodiment of type, the every other embodiment that those skilled in the art are obtained on the premise of creative work is not made,
Belong to the scope of the utility model protection.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it further need not be defined and explained in subsequent accompanying drawing.
Referring to Fig. 1, being a kind of knot for lungs sound difference signal Acquisition Circuit 10 that the utility model preferred embodiment is provided
Structure block diagram.As shown in figure 1, the lungs sound difference signal Acquisition Circuit 10 includes signal acquisition circuit 100, signal output apparatus
200 and signal amplification circuit 300.The input of the signal acquisition circuit 100 is electrically connected with external signal transmitting terminal, output
End and the input of the signal output apparatus 200 are electrically connected with.The output end of the signal output apparatus 200 and the signal
The input of amplifying circuit 300 is electrically connected with.
The signal acquisition circuit 100 is used for raw after being changed to the Lung Sounds that the external signal transmitting terminal is sent
Sent into voltage signal, and by the voltage signal to the signal output apparatus 200.The signal output apparatus 200 is used for
The voltage signal received is sent to the signal amplification circuit 300.The signal amplification circuit 300 is used to receive
To the voltage signal be amplified processing after generate amplified signal, and the amplified signal is exported.
Referring to Fig. 2, being a kind of original for lungs sound difference signal Acquisition Circuit 10 that the utility model preferred embodiment is provided
Reason figure.As shown in Fig. 2 alternatively, in the present embodiment, the signal acquisition circuit 100 includes acoustic-electric conversion sensor Q.Institute
The signal input part and the external signal transmitting terminal for stating acoustic-electric conversion sensor Q are electrically connected with, output end and the signal are defeated
The input for going out circuit 200 is electrically connected with.
Alternatively, the acoustic-electric conversion sensor Q can use electret capacitor microphone.The electret capacitor microphone
The Lung Sounds that the external signal transmitting terminal can be sent are converted to voltage signal, and the voltage signal is sent to described
Signal output apparatus 200.
Electret capacitor microphone is a kind of to replace polarization power supply with the electret for having been injected into electric charge in advance and being polarized
Condenser microphone.Electret capacitor microphone mainly includes two pieces of metal polar plates, and the surface of one of metal polar plate, which is scribbled, to be stayed
Polar body film, and metal polar plate ground connection.This two pieces of metal polar plates are oppositely arranged, and form a minimum air between the two
Gap, ultimately forms a plate condenser.
When in use, the external signal transmitting terminal collects the Lung Sounds of human body, and the Lung Sounds are sent
To the electret capacitor microphone.The Lung Sounds cause the electret film to vibrate and produce displacement, and then change
The distance between described plate condenser two-plate, so as to cause the volume change of electric capacity.Due to the electricity on the metal polar plate
Lotus number remains constant, will necessarily thus cause the voltage at the plate condenser two ends to change, so as to export electricity
Signal, is finally completed Lung Sounds to the conversion between electric signal.
Alternatively, in the present embodiment, the electret film can be made of perfluoroethylene-propylene material.Perfluoroethylene
Propylene has the performances such as excellent heat resistance, low frictional properties, heat endurance and electrical insulating property, has wide range of applications and making side
Just.
The signal output apparatus 200 includes pull-up resistor R1 and capacitance C1.One end of the pull-up resistor R1 and
The output end of the electret capacitor microphone is electrically connected with, another termination power.One end of the capacitance C1 and described
The output end of electret capacitor microphone is electrically connected with, the input of the other end and the signal amplification circuit 300 is electrically connected with.
Alternatively, in the present embodiment, the pull-up resistor R1 using 0805 encapsulation 4.7K Chip-R, it is described every
Straight electric capacity C1 uses 0.047uF non-polar condenser.When in use, the voltage letter sent from the electret capacitor microphone
Number existing alternating component has flip-flop again.The voltage signal is after the capacitance C1, direct current component quilt therein
Barrier, and AC portion can be transferred to the signal amplification circuit 300 by the capacitance C1.
Signal amplification circuit 300 is connected with the output end of the signal output apparatus 200, for it will receive described in
Voltage signal is amplified processing.The signal amplification circuit 300 includes operational amplifier U, pull down resistor R2 and feedback resistance
R3。
One end of the pull down resistor R2 and the operational amplifier U normal phase input end are electrically connected with, other end ground connection.
The feedback resistance R3 is electrically connected between the normal phase input end of the operational amplifier U and output end.The operation amplifier
Device U inverting input is electrically connected with the capacitance C1.
In the present embodiment, alternatively, the operational amplifier U uses the LM358 ICs that single supply is powered.Institute
Stating includes two independent, the compensation of high-gain, internal frequency dual operational amplifiers inside LM358 ICs, be suitable for
Supply voltage scope very wide single supply is used.The operational amplifier U is the core of whole signal amplification circuit 300.
Alternatively, in the present embodiment, 0805 encapsulation is respectively adopted in the pull down resistor R2 and the feedback resistance R3
The paster type resistor of 5K paster type resistors and the 10K of 0805 encapsulation.The multiplication factor of the signal amplification circuit 300 is 1+R3/
R2。
Referring to Fig. 3, being a kind of the another of lungs sound difference signal Acquisition Circuit 10 that the utility model preferred embodiment is provided
A kind of schematic diagram.As shown in figure 3, the lungs sound difference signal Acquisition Circuit 10 also includes RC wave filters 400.The RC wave filters
400 one end is electrically connected with the pull-up resistor R1, another termination power.
The RC wave filters 400 include current-limiting resistance R4 and filter capacitor C2, one end of the current-limiting resistance R4 with it is described
Pull-up resistor R1 is electrically connected with, another termination power.One end of the filter capacitor C2 and the pull-up resistor R1 and the limit
Leakage resistance R4 is electrically connected, other end ground connection.
Alternatively, in the present embodiment, the filter capacitor C2 uses 470uF alminium electrolytic condenser, the current-limiting resistance
R4 uses the 9K of 0805 encapsulation paster type resistor.The capacitance of alminium electrolytic condenser unit volume is very big, than other kinds of
Electric capacity big tens to hundreds times, and more other kinds of electric capacity has overwhelming advantage in price, can be mass-produced,
Cost is relatively low.
Another preferred embodiment of the utility model additionally provides a kind of lungs sound difference auscultation apparatus.Referring to Fig. 4, being this reality
A kind of structured flowchart of the lungs sound difference signal auscultation apparatus provided with new preferred embodiment.
As shown in figure 4, the lungs sound difference auscultation apparatus includes lungs sound harvester 20, microcontroller 30 and lungs sound difference
Signal acquisition circuit 10.The lungs sound difference signal Acquisition Circuit 10 is electrically connected at the lungs sound harvester 20 and described micro-
Between controller 30.The lungs sound difference signal Acquisition Circuit 10 include signal acquisition circuit 100, signal output apparatus 200 and
Signal amplification circuit 300.The input of the signal acquisition circuit 100 is electrically connected with the lungs sound harvester 20, exported
End and the input of the signal output apparatus 200 are electrically connected with.The output end of the signal output apparatus 200 and the signal
The input of amplifying circuit 300 is electrically connected with.The output end of the signal amplification circuit 300 electrically connects with the microcontroller 30
Connect.
The signal acquisition circuit 100 generates electricity after the Lung Sounds that the lungs sound harvester 20 is sent are changed
Pressure signal simultaneously sends it to the signal output apparatus 200.The signal output apparatus 200 sends out the voltage signal received
Deliver to the signal amplification circuit 300.The signal amplification circuit 300 is generated after the voltage signal received is amplified and put
Big signal simultaneously sends it to the microcontroller 30.The lungs sound difference signal Acquisition Circuit 10 is realized to gather lungs sound and filled
Put collection, conversion and the enhanced processing of the faint Lung Sounds of 20 transmissions.So that the lungs sound difference auscultation apparatus performance is more
Plus stably, the diagnostic result degree of accuracy is higher.
In summary, the utility model embodiment provides a kind of lungs sound difference signal Acquisition Circuit and lungs sound difference auscultation
Device.The lungs sound difference signal Acquisition Circuit 10 includes signal acquisition circuit 100, signal output apparatus 200, signal amplification circuit
300 and RC wave filters 400.The lungs sound difference signal Acquisition Circuit 10 realizes the faint lung sent to lungs sound harvester 20
Collection, conversion and the enhanced processing of message number, are that the follow-up processing for carrying out Lung Sounds provides the foundation.So that including the lung
The performance of the lungs sound difference auscultation apparatus of beat xor signal Acquisition Circuit 10 is more stablized, and the diagnostic result degree of accuracy is higher.
In description of the present utility model, in addition it is also necessary to which explanation, unless otherwise clearly defined and limited, term " are set
Put ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected.Can
To be mechanical connection or electrical connection.Can be joined directly together, can also be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in utility model.
, it is necessary to explanation in description of the present utility model, the orientation or position relationship of the instruction such as term " on ", " under "
For based on orientation shown in the drawings or position relationship, or the orientation or position that the utility model product is usually put when using
Relation, is for only for ease of description the utility model and simplifies description, rather than indicate or imply that the device or element of meaning must
There must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.
Claims (10)
1. a kind of lungs sound difference signal Acquisition Circuit, it is characterised in that including signal acquisition circuit, signal output apparatus and signal
Amplifying circuit, the input of the signal acquisition circuit and external signal transmitting terminal are electrically connected with, output end and the signal are defeated
The input for going out circuit is electrically connected with, and the output end of the signal output apparatus and the input of the signal amplification circuit are electrical
Connection；
The signal acquisition circuit is used to generate voltage after changing the Lung Sounds that the external signal transmitting terminal is sent
Signal, and the voltage signal is sent to the signal output apparatus；
The signal output apparatus is used to send the voltage signal received to the signal amplification circuit；
The signal amplification circuit, which is used to the voltage signal received being amplified after processing, generates amplified signal, and will
The amplified signal is exported.
2. lungs sound difference signal Acquisition Circuit according to claim 1, it is characterised in that the signal acquisition circuit includes
Acoustic-electric conversion sensor, the signal input part of the acoustic-electric conversion sensor is electrically connected with the external signal transmitting terminal, defeated
Go out end and the input of the signal output apparatus is electrically connected with.
3. lungs sound difference signal Acquisition Circuit according to claim 2, it is characterised in that the acoustic-electric conversion sensor is
Electret capacitor microphone.
4. lungs sound difference signal Acquisition Circuit according to claim 3, it is characterised in that the signal output apparatus includes
The output end electric connection of pull-up resistor and capacitance, one end of the pull-up resistor and the electret capacitor microphone,
The output end of another termination power, one end of the capacitance and the electret capacitor microphone is electrically connected with, the other end
It is electrically connected with the input of the signal amplification circuit.
5. lungs sound difference signal Acquisition Circuit according to claim 4, it is characterised in that the signal amplification circuit includes
Operational amplifier, pull down resistor and feedback resistance；
The normal phase input end of one end of the pull down resistor and the operational amplifier is electrically connected with, other end ground connection, described anti-
Feed resistance is electrically connected between the normal phase input end of the operational amplifier and output end, the operational amplifier it is anti-phase defeated
Enter end to be electrically connected with the capacitance.
6. lungs sound difference signal Acquisition Circuit according to claim 4, it is characterised in that the lungs sound difference signal collection
Circuit also includes RC wave filters, one end and pull-up resistor electric connection, another termination power of the RC wave filters.
7. lungs sound difference signal Acquisition Circuit according to claim 6, it is characterised in that the RC wave filters include current limliting
Resistance and filter capacitor, one end of the current-limiting resistance is electrically connected with the pull-up resistor, another termination power, the filtering
One end of electric capacity is electrically connected with the pull-up resistor and the current-limiting resistance, the other end is grounded.
8. lungs sound difference signal Acquisition Circuit according to claim 7, it is characterised in that the capacitance is nonpolarity
Capacitor, the filter capacitor is electrolytic capacitor.
9. lungs sound difference signal Acquisition Circuit according to claim 5, it is characterised in that the operational amplifier is
LM358 dual operational amplifiers.
10. a kind of lungs sound difference auscultation apparatus, it is characterised in that including lungs sound harvester, microcontroller and claim 1~
Lungs sound difference signal Acquisition Circuit described in 9 any one, the lungs sound difference signal Acquisition Circuit is electrically connected at the lung
Between sound harvester and the microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621134763.6U CN206372061U (en) | 2016-10-18 | 2016-10-18 | A kind of lungs sound difference signal Acquisition Circuit and lungs sound difference auscultation apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621134763.6U CN206372061U (en) | 2016-10-18 | 2016-10-18 | A kind of lungs sound difference signal Acquisition Circuit and lungs sound difference auscultation apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206372061U true CN206372061U (en) | 2017-08-04 |
Family
ID=59402928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621134763.6U Active CN206372061U (en) | 2016-10-18 | 2016-10-18 | A kind of lungs sound difference signal Acquisition Circuit and lungs sound difference auscultation apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206372061U (en) |
-
2016
- 2016-10-18 CN CN201621134763.6U patent/CN206372061U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yin et al. | A self-power-transmission and non-contact-reception keyboard based on a novel resonant triboelectric nanogenerator (R-TENG) | |
| CN101965681A (en) | Floating front-end amplifier and one-wire measuring devices | |
| CN206489185U (en) | Acceleration transducer test device | |
| CN106921364A (en) | The filter of mobile data acquisition device | |
| CN205427057U (en) | A sensor for measuring electrified volume of dust | |
| CN207180902U (en) | A kind of high precision temperature acquisition circuit | |
| CN206372061U (en) | A kind of lungs sound difference signal Acquisition Circuit and lungs sound difference auscultation apparatus | |
| CN106248240B (en) | A kind of temperature transmitter with temperature-compensating | |
| CN203231758U (en) | Wireless readout circuit of passive LC resonant transducer | |
| Duan et al. | Wireless gas sensing based on a passive piezoelectric resonant sensor array through near-field induction | |
| CN101957403B (en) | Non-contact conductometry measuring device stimulated by quartz crystal oscillator and method | |
| Zhang et al. | Self-powered autonomous wireless sensor system with multivariable sensing capability | |
| CN112798651A (en) | Passive humidity detection system based on electromagnetic induction | |
| CN203233395U (en) | Port multiplexing interface circuit for capacitance-type sensor | |
| CN206300918U (en) | A kind of amplifying circuit | |
| TWI574011B (en) | Three - dimensional sensing device | |
| Luo et al. | A three-dimensional coupled structure triboelectric nanogenerator for vertical and horizontal mechanical energy harvesting and fitness gait monitoring | |
| CN203506707U (en) | Continuous dynamic monitoring signal measurement circuit for small-sized electronic sphygmomanometer | |
| TW200426372A (en) | Design 2D wind flow sensor with electronic field | |
| CN110006523A (en) | A kind of handy vibrometer and its information extracting method | |
| CN107092810A (en) | Human body physical sign data collection station and data processing equipment based on piezoelectric sensing band | |
| CN221280441U (en) | PENG self-energy-taking sensor for measuring vibration signals of reactor | |
| CN103473029B (en) | A kind of multiplier | |
| CN206149224U (en) | A difference signal limit circuit for lung sound difference auscultation device | |
| CN206372063U (en) | A kind of Lung Sounds modulate circuit and human body lungs sound auscultation apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |