CN107837092A - A kind of stethoscope with heart sound detection function - Google Patents
A kind of stethoscope with heart sound detection function Download PDFInfo
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- CN107837092A CN107837092A CN201711057414.8A CN201711057414A CN107837092A CN 107837092 A CN107837092 A CN 107837092A CN 201711057414 A CN201711057414 A CN 201711057414A CN 107837092 A CN107837092 A CN 107837092A
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- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 230000010354 integration Effects 0.000 claims abstract description 55
- 230000003321 amplification Effects 0.000 claims abstract description 23
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 23
- 238000002555 auscultation Methods 0.000 claims abstract description 19
- 230000010358 mechanical oscillation Effects 0.000 claims description 5
- 238000003745 diagnosis Methods 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001121 heart beat frequency Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B7/00—Instruments for auscultation
- A61B7/02—Stethoscopes
- A61B7/04—Electric stethoscopes
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Abstract
The invention discloses a kind of stethoscope with heart sound detection function, including stethoscope body, stethoscope body includes auscultation head, sound guide tube, three-pronged connector and receiver, resonance plate is provided with auscultation head, stethoscope also includes heart sound transducer, signal amplification module, integration module, square wave module, base modules, comparison module and display module；Heart sound transducer is connected with signal amplification module, and signal amplification module is connected with integration module, and integration module and base modules are connected with comparison module respectively, and comparison module is connected with display module, and square wave module is connected with integration module.The invention judges the power of patient's heart sound by the height of integration module output voltage signal, the self judgment of doctor need not be relied on, the invention circuit structure is simple simultaneously, and single detection time expense is small, is easy in outpatient service link doctor to the quick diagnosis of numerous patients.The heart sound that the invention is used to detect patient is strong and weak.
Description
Technical field
The present invention relates to electronic circuit technology field, more specifically to a kind of stethoscope with heart sound detection function.
Background technology
In existing medical service provider system, the effect of outpatient service mainly has two, and first is treatment common disease, and another is
Promptly judge to be possible to the patient with major disease from patient, to make further diagnosis, i.e. outpatient service is main
It is responsible for the first visit work to numerous patients.
The doctor in outpatient service that takes office usually is named as stethoscopic medicine equipment using to one kind, and doctor is by stethoscope to just
The heart correlation circumstance for examining personnel is diagnosed, and mainly the heart sound situation of patient is understood by stethoscope, its
The power of middle heart sound is a data of the main understanding of doctor.At present the overwhelming majority doctor all be by itself practise medicine through
Test and judge that the heart sound of patient is strong and weak, lack criterion, erroneous judgement probability is high.And carry heart sound in the presence of one kind in the prior art
The stethoscope of detection function, caardiophonogram can be shown on display instrument, doctor can be drastically increased to patient's heart
Sound diagnosis the degree of accuracy, but spend time it is longer, be unfavorable for applying in ambulatory care link, unfavorable outpatient service to it is numerous just
Examine the first visit work of personnel.
The content of the invention
The technical problem to be solved in the present invention is：A kind of auscultation that can detect patient's heart sound power rapidly is provided
Device.
The present invention solve its technical problem solution be：
A kind of stethoscope with heart sound detection function, including stethoscope body, the stethoscope body include auscultation head, led
Sound tube, three-pronged connector and receiver, the auscultation head are connected with receiver by three-pronged connector by sound guide tube, set in the auscultation head
Have a resonance plate, the invention also include heart sound transducer, signal amplification module, integration module, square wave module, base modules,
Comparison module and display module；The heart sound transducer output end is connected with signal amplification module input, and the signal is put
Big module output end is connected with integration module input, the integration module output end and base modules output end respectively with than
It is connected compared with module input, the comparison module output end is connected with display module input, the square wave module and integration mould
Block is connected；The heart sound transducer is arranged on inside auscultation head and resonance plate mechanical oscillation signal is converted into electric signal.
As the further improvement of above-mentioned technical proposal, the heart sound transducer includes inductance coil and produces constant magnetic
The permanent magnet of field, the inductance coil are arranged on resonance plate, and the permanent magnet is arranged on inside auscultation head, the inductance coil
It is connected with signal amplification module input.
As the further improvement of above-mentioned technical proposal, the signal amplification module includes filter unit and amplification is single
Member, the filter unit are low pass filter, and the heart sound transducer output end is connected with filter unit input, the filtering
Unit output end is connected with amplifying unit input, and the amplifying unit output end is connected with integration module input.
As the further improvement of above-mentioned technical proposal, the filter unit includes electric capacity C1, electric capacity C2, resistance R1, electricity
Resistance R2, resistance R3, resistance R4 and transport and placing device A1, the resistance R1 and resistance R2 are connected on inductance coil and the same phases of transport and placing device A1
Between input, the resistance R3 and resistance R4 are connected between transport and placing device A1 output ends and earth terminal, and the transport and placing device A1 is anti-
Mutually input terminates at resistance R3 and resistance R4 tie point, and the transport and placing device A1 output ends are connected on resistance R1 and electricity by electric capacity C1
R2 tie point is hindered, the electric capacity C2 both ends are connected with transport and placing device A1 in-phase input ends with earth terminal respectively, the transport and placing device A1
Output end is connected with amplifying unit input.
As the further improvement of above-mentioned technical proposal, the amplifying unit includes model MAX9812 amplifier core
Piece, the filter unit output end are connected with amplifier chip input, and the amplifier chip output end and integration module are defeated
Enter end to be connected.
As the further improvement of above-mentioned technical proposal, the integration module include diode D1, resistance R5, resistance R6,
Electric capacity C3 and transport and placing device A2, the signal amplification module output end are connected with diode D1 positive poles, the diode D1 negative poles
It is connected by resistance R5 with transport and placing device A2 in-phase input ends, the transport and placing device A2 inverting inputs are grounded by resistance R6, described
Electric capacity C3 both ends are connected with transport and placing device A2 in-phase input ends with output end respectively, and the transport and placing device A2 output ends and comparison module are defeated
Enter end to be connected.
As the further improvement of above-mentioned technical proposal, the square wave module include 555 timers, resistance R7, resistance R8,
Electric capacity C4 and two level switches, the resistance R7, resistance R8 and electric capacity C4 connect between the powered end and the ground end, institute
State the electric discharge of 555 timers to terminate between resistance R7 and resistance R8, the 555 Timer Threshold input and triggering input are equal
It is connected between resistance R8 and electric capacity C4,555 timer output end is connected with two level switch control terminals respectively, an electricity
The energization connection for closing control integration module and power end is opened flat, another level switch controls the short circuit of electric capacity C3 in integration module
Connection.
The beneficial effects of the invention are as follows：Resonance plate mechanical oscillation signal is converted into telecommunications by the present invention by heart sound transducer
Number, and integration operation is carried out to the electric signal, the height of the voltage signal exported by integration module judges patient indirectly
The power of heart sound.The invention can Intelligent Measurement go out patient in outpatient service heart sound it is strong and weak, without rely on doctor from
I judges that accuracy of judgement, while the invention circuit structure is simple, single detection time expense is small, is easy in outpatient service link
Quick diagnosis of the middle doctor to numerous patients.The heart sound that the invention is used to detect patient is strong and weak.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described.Obviously, described accompanying drawing is the part of the embodiment of the present invention, rather than is all implemented
Example, those skilled in the art on the premise of not paying creative work, can also obtain other designs according to these accompanying drawings
Scheme and accompanying drawing.
Fig. 1 is the stethoscope structure schematic diagram of the invention；
Fig. 2 is the schematic block circuit diagram of the invention；
Fig. 3 is the signal amplification module embodiment schematic diagram of the invention；
Fig. 4 is the integration module embodiment schematic diagram of the invention；
Fig. 5 is the square wave module embodiments schematic diagram of the invention.
Embodiment
Carried out below with reference to the design of embodiment and accompanying drawing to the present invention, concrete structure and caused technique effect clear
Chu, complete description, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair
Bright part of the embodiment, rather than whole embodiments, based on embodiments of the invention, those skilled in the art is not paying
The other embodiment obtained on the premise of creative work, belongs to the scope of protection of the invention.In addition, be previously mentioned in text
All annexations, not single finger element directly connect, and refer to can be according to specific implementation situation, by adding or reducing connection
Element, to form more excellent circuit structure.Each technical characteristic in the invention, on the premise of not conflicting conflict
Can be with combination of interactions.
1~Fig. 5 of reference picture, the invention disclose a kind of stethoscope with heart sound detection function, including stethoscope sheet
Body, the stethoscope body include auscultation head 1, sound guide tube 2, three-pronged connector 3 and receiver 4, and the auscultation head 1 is by sound guide tube 2
Connected by three-pronged connector 3 with receiver 4, be provided with resonance plate in the auscultation head 1, the invention also including heart sound transducer,
Signal amplification module, integration module, square wave module, base modules, comparison module and display module；The heart sound transducer is defeated
Go out end with signal amplification module input to be connected, the signal amplification module output end is connected with integration module input, described
Integration module output end and base modules output end are connected with comparison module input respectively, the comparison module output end with
Display module input is connected, and the square wave module is connected with integration module to control the energization of the integration module and power end
Connection；The heart sound transducer is arranged on the inside of auscultation head 1 and resonance plate mechanical oscillation signal is converted into electric signal.Wherein institute
State square wave module to be used to export certain frequency, dutycycle is 50% pulse square wave signal, and the frequency of pulse square wave signal can be with
It is the half of heartbeat frequency in the case of human normal, i.e., described square wave Module cycle exports the height in a heartbeat cycle
Level, the low level in a heartbeat cycle.When square wave module exports high level, the logical of integration module and power end is connected
Electrical connection, make integration module to input signal carry out integration operation, when square wave module export low level when, disconnect integration module with
The energization connection of power end, stops integration module operation, while initializes integration module, is the product in next heartbeat cycle
Operation is divided to prepare.The voltage magnitude of the output of integration module described in the invention and the intensity of heart sounds detected are in positive
Close, the base modules are according to the circuit element parameter and relevant medical domain knowledge of reality, and output one is for differentiating the heart
The weak reference voltage of loudness of a sound, when integration module output voltage is more than base modules output voltage, is recognized to comparison module input
It is normal for patient's intensity of heart sounds, and exported by display module, the display module may be mounted at three-pronged connector 3
On, other positions can also be arranged on, are communicated to connect by wireless communication module, such as bluetooth module with comparison module.
Specifically, resonance plate mechanical oscillation signal is converted into electric signal by the invention by heart sound transducer, and right
The electric signal carries out integration operation, and the height of the voltage signal exported by integration module judges the strong of patient's heart sound indirectly
It is weak.The invention can Intelligent Measurement go out patient in outpatient service heart sound it is strong and weak and shown by display module, nothing
The self judgment of doctor, accuracy of judgement need to be relied on, while the invention circuit structure is simple, single detection time expense is small,
It is easy in outpatient service link doctor to the quick diagnosis of numerous patients.
It should be noted that although the invention is related to the technological means of software program, but it is not carried out
Improve, the invention is mainly improved to the hardware circuit involved by stethoscope.
Preferred embodiment is further used as, the heart sound transducer is used for the ticktack message for gathering heart of patient
Number, and convert thereof into electric signal.It is described in the invention embodiment to realize the heart sound transducer function
Heart sound transducer includes inductance coil and produces the permanent magnet of stationary magnetic field, and the inductance coil is arranged on resonance plate, institute
Permanent magnet is stated inside auscultation head 1, the inductance coil is connected with signal amplification module input.Human heart it is each
Bounce, sound can be all produced, sound, which is entered in auscultation head 1, makes the resonance plate of inside produce vibration, so as to drive inductance coil
The motion of cutting magnetic induction line is done in magnetic field, produces corresponding electric signal.
Preferred embodiment is further used as, is deposited in the electric signal that heart sound transducer described in the invention is exported
In certain high frequency spurs signal, while the electric signal that heart sound transducer is exported is weaker, and amplitude is relatively low, with reference to above-mentioned reason sheet
Signal amplification module described in innovation and creation embodiment needs to be provided simultaneously with filtering and enlarging function, the signal are put
Big module includes filter unit and amplifying unit, and the filter unit is low pass filter, the heart sound transducer output end
It is connected with filter unit input, the filter unit output end is connected with amplifying unit input, the amplifying unit output
End is connected with integration module input.
It is further used as preferred embodiment, in the invention embodiment, the filter unit includes electricity
Hold C1, electric capacity C2, resistance R1, resistance R2, resistance R3, resistance R4 and transport and placing device A1, the resistance R1 and resistance R2 are connected on
Between inductance coil and transport and placing device A1 in-phase input ends, the resistance R3 and resistance R4 are connected on transport and placing device A1 output ends and ground connection
Between end, the transport and placing device A1 anti-phase inputs terminate at resistance R3 and resistance R4 tie point, and the transport and placing device A1 output ends are led to
The tie point that electric capacity C1 is connected on resistance R1 and resistance R2 is crossed, the electric capacity C2 both ends are respectively with transport and placing device A1 in-phase input ends with connecing
Ground terminal is connected, and the transport and placing device A1 output ends are connected with amplifying unit input.Specifically, filter unit described in the present embodiment
It is a second order active low pass filter, filter effect is good.
It is further used as preferred embodiment, in the invention embodiment, the amplifying unit includes type
Number amplifier chip for being MAX9812, the filter unit output end is connected with amplifier chip input, the amplifier core
Piece output end is connected with integration module input.The present embodiment is exported using the amplifier chip of high integration to filter unit
Electric signal be amplified operation, greatly reduce the complexity of circuit structure.
Preferred embodiment is further used as, to realize the function of the integration module, the invention specific implementation
In mode, the integration module includes diode D1, resistance R5, resistance R6, electric capacity C3 and transport and placing device A2, the signal amplification
Module output end is connected with diode D1 positive poles, and the diode D1 negative poles pass through resistance R5 and transport and placing device A2 in-phase input end phases
Even, the transport and placing device A2 inverting inputs are grounded by resistance R6, the electric capacity C3 both ends respectively with transport and placing device A2 homophase inputs
End is connected with output end, and the transport and placing device A2 output ends are connected with comparison module input.Wherein described diode D1 is used for will
Minus part removes in the electric signal of signal amplification module output, diode D1 conduct herein it is similar with rectification circuit
Halfwave rectifier function.
Preferred embodiment is further used as, it is necessary to control the time of integration of integration module, also during practical application simultaneously
Need after the completion of each integration operation, initialization operation is carried out to integration module.To realize function above, the invention tool
In body embodiment, the square wave module includes 555 timers, resistance R7, resistance R8, electric capacity C4 and two level switches,
Between the powered end and the ground end, the 555 timer electric discharge terminates at electricity for the resistance R7, resistance R8 and electric capacity C4 series connection
Between hindering R7 and resistance R8, the 555 Timer Threshold input and triggering input are connected between resistance R8 and electric capacity C4,
555 timer output end is connected with two level switch control terminals respectively, a level switch control integration module and electricity
The energization connection of source, another level switch control the short circuit connection of electric capacity C3 in integration module.Specifically, when square wave module
When exporting high level, a level switch output end closure realizes that the energization of integration module and power end connects, another level
Output switching terminal disconnects electric capacity C3 short circuit connection；When square wave module exports low level, a level switch output end disconnects
Integration module is set to be disconnected with power end, another level switch output end closure realizes electric capacity C3 short circuit connection, makes electricity
The electric charge held on C3 is removed, and electric capacity C3 is returned to original state, this is to make electric capacity C3 when next integration period starts
Initial voltage be zero.
The better embodiment of the present invention is illustrated above, but the invention is not limited to the implementation
Example, those skilled in the art can also make a variety of equivalent modifications on the premise of without prejudice to spirit of the invention or replace
Change, these equivalent modifications or replacement are all contained in the application claim limited range.
Claims (7)
1. a kind of stethoscope with heart sound detection function, including stethoscope body, the stethoscope body includes auscultation head, leading note
Pipe, three-pronged connector and receiver, the auscultation head are connected with receiver by three-pronged connector by sound guide tube, are provided with the auscultation head
Resonance plate, it is characterised in that：Also include heart sound transducer, signal amplification module, integration module, square wave module, base modules, ratio
Compared with module and display module；The heart sound transducer output end is connected with signal amplification module input, the signal amplification
Module output end is connected with integration module input, and the integration module output end and base modules output end are respectively compared with
Module input is connected, and the comparison module output end is connected with display module input, the square wave module and integration module
It is connected；The heart sound transducer is arranged on inside auscultation head and resonance plate mechanical oscillation signal is converted into electric signal.
A kind of 2. stethoscope with heart sound detection function according to claim 1, it is characterised in that：The heart sound transducer
Permanent magnet including inductance coil and generation stationary magnetic field, the inductance coil are arranged on resonance plate, the permanent magnet peace
Inside auscultation head, the inductance coil is connected with signal amplification module input.
A kind of 3. stethoscope with heart sound detection function according to claim 2, it is characterised in that：The signal amplifies mould
Block includes filter unit and amplifying unit, and the filter unit is low pass filter, the heart sound transducer output end and filter
Ripple unit input is connected, and the filter unit output end is connected with amplifying unit input, the amplifying unit output end with
Integration module input is connected.
A kind of 4. stethoscope with heart sound detection function according to claim 3, it is characterised in that：The filter unit bag
Include electric capacity C1, electric capacity C2, resistance R1, resistance R2, resistance R3, resistance R4 and transport and placing device A1, resistance R1 and resistance the R2 string
Be associated between inductance coil and transport and placing device A1 in-phase input ends, the resistance R3 and resistance R4 be connected on transport and placing device A1 output ends with
Between earth terminal, the transport and placing device A1 anti-phase inputs terminate at resistance R3 and resistance R4 tie point, the transport and placing device A1 outputs
End is connected on resistance R1 and resistance R2 tie point by electric capacity C1, the electric capacity C2 both ends respectively with transport and placing device A1 in-phase input ends
It is connected with earth terminal, the transport and placing device A1 output ends are connected with amplifying unit input.
A kind of 5. stethoscope with heart sound detection function according to claim 4, it is characterised in that：The amplifying unit bag
Model MAX9812 amplifier chip is included, the filter unit output end is connected with amplifier chip input, the amplification
Device chip output is connected with integration module input.
A kind of 6. stethoscope with heart sound detection function according to claim 1, it is characterised in that：The integration module bag
Include diode D1, resistance R5, resistance R6, electric capacity C3 and transport and placing device A2, the signal amplification module output end and diode D1
Positive pole is connected, and the diode D1 negative poles are connected by resistance R5 with transport and placing device A2 in-phase input ends, and the transport and placing device A2 is anti-phase
Input is grounded by resistance R6, and the electric capacity C3 both ends are connected with transport and placing device A2 in-phase input ends with output end respectively, described
Transport and placing device A2 output ends are connected with comparison module input.
A kind of 7. stethoscope with heart sound detection function according to claim 6, it is characterised in that：The square wave module bag
Include 555 timers, resistance R7, resistance R8, electric capacity C4 and two level switches, the resistance R7, resistance R8 and electric capacity C4
Between the powered end and the ground end, the 555 timer electric discharge is terminated between resistance R7 and resistance R8, and described 555 is fixed for series connection
When device threshold value input and triggering input be connected between resistance R8 and electric capacity C4,555 timer output end respectively with
Two level switch control terminals are connected, and the energization of a level switch control integration module and power end connects, another level
Electric capacity C3 short circuit connection in switch control integration module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711057414.8A CN107837092A (en) | 2017-11-01 | 2017-11-01 | A kind of stethoscope with heart sound detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711057414.8A CN107837092A (en) | 2017-11-01 | 2017-11-01 | A kind of stethoscope with heart sound detection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107837092A true CN107837092A (en) | 2018-03-27 |
Family
ID=61681741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711057414.8A Pending CN107837092A (en) | 2017-11-01 | 2017-11-01 | A kind of stethoscope with heart sound detection function |
Country Status (1)
| Country | Link |
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| CN (1) | CN107837092A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2790407Y (en) * | 2005-05-10 | 2006-06-28 | 北京奥瑞赛斯传感技术有限公司 | Digital fetus cardiac sound measuring device |
| CN203388879U (en) * | 2013-07-03 | 2014-01-15 | 张玉凤 | Stethoscope with heart rate counting function |
| CN204813942U (en) * | 2015-03-27 | 2015-12-02 | 安静 | Portable stethoscope |
| CN205831781U (en) * | 2016-06-12 | 2016-12-28 | 深圳市沃特沃德股份有限公司 | A kind of piezoelectric sensing device and house pet pectoral girdle |
| CN106333668A (en) * | 2016-09-06 | 2017-01-18 | 苏州萌动医疗科技有限公司 | Monitoring device for fetal heart rate |
| CN107049357A (en) * | 2017-05-25 | 2017-08-18 | 西华大学 | A kind of cardiechema signals analytic method, apparatus and system |
| CN208659396U (en) * | 2017-11-01 | 2019-03-29 | 佛山科学技术学院 | A kind of stethoscope with heart sound detection function |
-
2017
- 2017-11-01 CN CN201711057414.8A patent/CN107837092A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2790407Y (en) * | 2005-05-10 | 2006-06-28 | 北京奥瑞赛斯传感技术有限公司 | Digital fetus cardiac sound measuring device |
| CN203388879U (en) * | 2013-07-03 | 2014-01-15 | 张玉凤 | Stethoscope with heart rate counting function |
| CN204813942U (en) * | 2015-03-27 | 2015-12-02 | 安静 | Portable stethoscope |
| CN205831781U (en) * | 2016-06-12 | 2016-12-28 | 深圳市沃特沃德股份有限公司 | A kind of piezoelectric sensing device and house pet pectoral girdle |
| CN106333668A (en) * | 2016-09-06 | 2017-01-18 | 苏州萌动医疗科技有限公司 | Monitoring device for fetal heart rate |
| CN107049357A (en) * | 2017-05-25 | 2017-08-18 | 西华大学 | A kind of cardiechema signals analytic method, apparatus and system |
| CN208659396U (en) * | 2017-11-01 | 2019-03-29 | 佛山科学技术学院 | A kind of stethoscope with heart sound detection function |
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Application publication date: 20180327 |