CN206499478U - Multi-purpose electronic stethoscope - Google Patents
Multi-purpose electronic stethoscope Download PDFInfo
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- CN206499478U CN206499478U CN201621090075.4U CN201621090075U CN206499478U CN 206499478 U CN206499478 U CN 206499478U CN 201621090075 U CN201621090075 U CN 201621090075U CN 206499478 U CN206499478 U CN 206499478U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The utility model is related to a kind of multi-purpose electronic stethoscope, including power generation circuit, auscultation head, primary amplifying circuit, bandwidth-limited circuit, notch filter circuit, main amplification and voltage offset electric circuit, signal processing module；The power generation circuit, for being that primary amplifying circuit and signal processing module are powered；The auscultation head is used to send human body cardiechema signals or tire message number to primary amplifying circuit；The primary amplifying circuit, for the signal of collection to be amplified；The bandwidth-limited circuit, the signal for collection carries out noise reduction process；The notch filter circuit, AF panel is carried out for the signal to collection；The main amplification and voltage offset electric circuit, are amplified for the signal to collection, and the magnitude of voltage after amplification is biased to the magnitude of voltage of setting；The signal processing module, is handled and A/D conversions for the signal to collection.
Description
Technical field
The utility model is related to a kind of electronic auscultation device, particularly a kind of multi-purpose electronic stethoscope；The utility model is also
There is provided a kind of multifunction electronic auscultation system.
Background technology
Cardiechema signals are the signals produced by heart and blood vessel mechanical oscillation, it may be possible to reflect the atrium of heart, the heart
The moving situation of room valve and blood vessel, the physiology and pathological information acted in itself and each other comprising heart various pieces.
Analysis of PCG Signal has electrocardiogram, the advantage that ultrasound electrocardiogram is not replaced.Cardiechema signals can reflect Congenital Heart
Valve is impaired, mechanical activity obstacle caused by electrocardio conductive tissue lesion etc.；It is abnormal caused by electrocardio conductive tissue
Mechanical activity obstacle will not be reacted in the very first time in cardiac electric signals (ECG) change, can but show heart sound
In the change of signal；The features such as inspection of heart sound has non-invasive and reproducible simultaneously.
The equipment of traditional auscultation mainly is common auscultation head, then is gone by the experience of doctor to determine whether there is heart
Disease risk, it is difficult to capture some small very important physiological signals of inside of human body, can not be real-time during auscultation
Display waveform, is easily influenceed by human ear sensitivity limitation etc. and the same time can not integrate the defects such as auscultation multi-signal.
Electronic auscultation device class categories belong to：6820 common examination apparatuses, belong to II class apparatuses.Home sale needs CFDA to produce
Product are registered, and electronic auscultation device, which belongs to, product-derived, needs also exist for meeting electrical safety (GB 9706.1) and electromagnetic compatibility (YY
0505) requirement.Domestic have two granted electronic auscultation device products at present, but user is doctor, and product is in itself not
It is related to medical diagnosis on disease, is only used for the collection and digitlization of signal, it is impossible to deserve to be called smart machine.On the other hand, on intelligence
Auscultation, often function is single for existing patent, in addition to for heart sound, lungs sound detection, does not possess complete system support, not deeply
Excavate the information available for preliminary medical diagnosis on disease that is contained of cardiechema signals, and fetal heart sound can not be had both and detect and Intelligent Recognition
Function.
Utility model content
The utility model is the shortcoming and deficiency for overcoming prior art there is provided a kind of multi-functional electronic auscultation device and listened
Examine system.
The utility model is realized by following technical scheme：A kind of multi-purpose electronic stethoscope, including power supply production
Raw circuit, auscultation head, primary amplifying circuit, bandwidth-limited circuit, notch filter circuit, main amplification and voltage offset electric circuit, letter
Number processing module；
The power generation circuit, for being that primary amplifying circuit and signal processing module are powered；
The auscultation head is used for and human contact, and human body cardiechema signals or tire message number are sent to primary amplifying circuit；
The primary amplifying circuit, for the signal of collection to be amplified, and transmits the signal to bandpass filtering electricity
Road；
The bandwidth-limited circuit, the signal for collection carries out noise reduction process, and transmits the signal to notch filter
Circuit；
The notch filter circuit, carries out AF panel, and transmit the signal to main amplification for the signal to collection
Circuit；
The main amplification and voltage offset electric circuit, are amplified for the signal to collection, and by the magnitude of voltage after amplification
The magnitude of voltage of setting is biased to, is retransmited to signal processing module；
The signal processing module, is handled and A/D conversions for the signal to collection.
As further improvement of the utility model, the power generation circuit include 9V dry cells, the first voltage stabilizing chip,
Second voltage stabilizing chip and charge pump reversed polarity switch integrated regulator；First voltage stabilizing chip is connected with the dry cell, production
Raw+5V voltage；The charge pump reversed polarity switch integrated regulator is connected with the output voltage of first voltage stabilizing chip,
Generation -5V voltages；Second voltage stabilizing chip is connected with the output voltage of first voltage stabilizing chip, produces 3.3V voltages；Institute
Stating+5V, -5V voltage is used to be that primary amplifying circuit is powered, the 3.3V voltages are that the signal processing module is powered.
As further improvement of the utility model, the primary amplifying circuit is transistor amplifier.
As further improvement of the utility model, the primary amplifying circuit is amplifier amplifying circuit；The amplifier is put
Big circuit includes：Operational amplifier, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the first electric capacity C9,
Second electric capacity C10；The inverting input of the operational amplifier successively with second resistance R2, the second electric capacity C10, first resistor
R1, the first electric capacity C9 connections；The normal phase input end of the operational amplifier is connected with 3rd resistor；The operational amplifier it is defeated
Go out end to be connected with the inverting input by the 4th resistance R4.
As further improvement of the utility model, the bandwidth-limited circuit is electric for 20Hz~600Hz bandpass filtering
Road.
As further improvement of the utility model, the notch filter circuit is 50Hz trap circuit.
As further improvement of the utility model, the main amplification and biasing circuit amplify the signal voltage amplitude
7.5 times, and signal voltage is biased into 0~3.3V.
As further improvement of the utility model, the signal processing module include analog-digital converter, digital filter,
DMA controllers, heart rate and HRV computing modules, handover module and bluetooth module；
The analog-digital converter, for analog signal to be converted into data signal；
The digital filter, for the elimination disturbed data signal；
The dma controller, for realizing the analog-digital converter to internal memory and the interior high-speed transfer for being stored to serial ports；
Heart rate and HRV the parameter computing module, for calculating heart rate and HRV parameters；
The handover module, for carrying out pattern switching, the pattern includes：Adult, adult's heart sound envelope, fetal rhythm, tire
Five kinds of patterns of percardium and lungs sound；
The bluetooth module, for realizing the communication connection with extraneous terminal.
Compared to prior art, the utility model possesses following beneficial effect：
1. gathering the cardiechema signals of different age group crowd in the way of passive unperturbed formula, and it can monitor in real time.
2., can using common can plus Electret condenser microphone with regard to the heart sound acquisition probe of an excellent performance can be constituted
Cardiechema signals are converted into electric signal, fetal heart sound of the pregnancy more than more than 20 weeks is can detect, compares existing Doppler type heart sound
Survey meter, passive detection mode is radiationless, and the influence to human body is minimized.
3. cardiechema signals can be extracted precisely, cardiechema signals peak intervals are obtained, knowledge HRV are debated, mobile terminal is real-time
Visualize waveform, data and provide offline diagnosis report, possess emergency alarm measure.
4. the cardiechema signals collected are processed into data by hardware components, the cardiechema signals collected pass through hardware components
Data are processed into, the host computers such as the APP and computer of mobile phone can be shown in real time, terminal can record to cardiechema signals
(and display waveform), playback, Modern Signal Analysis and diagnosis, using Adaptive Signal Processing scheme as foundation, depth analysis heart sound
Signal characteristic.
In order to more fully understand and implement, the utility model is described in detail below in conjunction with the accompanying drawings.
Brief description of the drawings
Fig. 1 is the circuit connection diagram of electronic auscultation system of the present utility model.
Fig. 2 is the circuit diagram of power generation circuit of the present utility model.
Fig. 3 is the circuit diagram of primary amplifying circuit first way of the present utility model.
Fig. 4 is the circuit diagram of the primary amplifying circuit second way of the present utility model.
Fig. 5 is the circuit diagram of bandwidth-limited circuit of the present utility model.
Fig. 6 is the circuit diagram of main amplification of the present utility model and voltage offset electric circuit.
Fig. 7 is the internal module connection block diagram of signal processing module of the present utility model.
Fig. 8 is the connection block diagram of electronic auscultation system of the present utility model.
Fig. 9 is the circuit diagram of STM32 minimum systems.
Figure 10 is the partial enlarged drawing of the Bluetooth circuit socket of process chip.
Figure 11 is the internal module connection block diagram of mobile terminal of the present utility model.
Figure 12 is the internal module connection block diagram of computer terminal of the present utility model.
Embodiment
The utility model lacks to solve not obtaining the technology of fetal heart sound detection and progress Intelligent Recognition in the prior art
Fall into there is provided a kind of multi-functional electronic auscultation device and auscultation system, specifically illustrated by following embodiment.
Referring to Fig. 1, it is the circuit connection diagram of electronic auscultation system of the present utility model.The utility model is provided
A kind of multi-purpose electronic stethoscope 1, including power generation circuit 11, auscultation head 12, primary amplifying circuit 13, bandpass filtering electricity
Road 14, notch filter circuit 15, main amplification and voltage offset electric circuit 16, signal processing module 17.
The power generation circuit 11, for being that primary amplifying circuit and signal processing module are powered.
The auscultation head 12, is used for and human contact, and human body cardiechema signals or tire message number are sent to primary amplification electricity
Road.
The primary amplifying circuit 13, for the signal of collection to be amplified, and transmits the signal to bandpass filtering
Circuit.
The bandwidth-limited circuit 14, the signal for collection carries out noise reduction process, and it is sunken to transmit the signal to power frequency
Wave circuit.
The notch filter circuit 15, carries out AF panel for the signal to collection, and transmits the signal to master to put
Big circuit.
The main amplification and voltage offset electric circuit 16, are amplified for the signal to collection, and by the voltage after amplification
Value biases to the magnitude of voltage of setting, retransmits to signal processing module.
The signal processing module 17, is handled and A/D conversions for the signal to collection.
Further, the circuit diagram of each above-mentioned circuit module is introduced individually below.It is specific as follows：
Referring to Fig. 2, it is the circuit diagram of power generation circuit of the present utility model.
The power generation circuit of the present utility model includes 9V dry cells, the first voltage stabilizing chip U1, the second voltage stabilizing chip
U3 and charge pump reversed polarity switch integrated regulator U2.Specifically, in the utility model, the first voltage stabilizing chip U1 is adopted
Model SM1117-5.0, the second voltage stabilizing chip U3 is used to use model ASM1117-3.3, charge pump reversed polarity switch collection
The model MAX660 used into voltage-stablizer U2.
The voltage input end of the first voltage stabilizing chip U1 is connected with the dry cell, and exports+5V voltage；The electricity
Lotus pump reversed polarity switch integrated regulator is connected with the output voltage of first voltage stabilizing chip, generation -5V voltages.Described second
Voltage stabilizing chip is connected with the output voltage of first voltage stabilizing chip, produces 3.3V voltages.Wherein ,+the 5V, -5V voltages are used
In being powered for primary amplifying circuit, the 3.3V voltages are that the signal processing module is powered.
Further, the signal collected by electret stethoscope is very small, probably only 30-60mV amplitude, it is impossible to full
The requirement of sufficient later stage filtering, it is necessary to carry out primary enhanced processing.Alternative two kinds of preposition microphone amplifying circuits, are gathered to electret
Voice signal carry out 10 times amplification.Primary amplifying circuit in the utility model can be used：Transistor amplifier or fortune
Put amplifying circuit.
Wherein, if the primary amplifying circuit is transistor amplifier, the transistor amplifier such as Fig. 3 institutes
Show, it is the circuit diagram of transistor amplifier.Wherein, the transistor amplifier includes the fortune of a triode Q1 and first
Calculate amplifier U1A.The model of the triode Q1 uses BCP68, and the model of the operational amplifier uses LM324.Wherein, three
Pole pipe Q1 is used to the signal collected being amplified, and triode Q1 colelctor electrode is input to the anti-of the first operational amplifier
Phase input.Using the first operational amplifier U1A as voltage follower, the voltage of input is subjected to anti-phase output.
In addition, as the another way of the present embodiment, the primary amplifying circuit can be amplifier amplifying circuit.Specifically
, referring to Fig. 4, it is the circuit diagram of amplifier amplifying circuit of the present utility model.The amplifier amplifying circuit includes：Second fortune
Calculate amplifier U4B, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the first electric capacity C9, the second electric capacity
C10；The inverting input of the operational amplifier successively with second resistance R2, the second electric capacity C10, first resistor R1, first electricity
Hold C9 connections；The normal phase input end of the second operational amplifier U4B is connected with 3rd resistor；Second operational amplifier
U4B output end is connected by the 4th resistance R4 with the inverting input.Wherein, in the present embodiment, second computing
Amplifier U4B model is preferably：OPA2277.Using accurate amplifier OPA2277, by 10K resistance, C9 and VCC are to electret
Body is powered；Electric capacity C10 is as capacitance, and making the DC voltage at electric capacity two ends will not interact, while as coupled capacitor,
Amplifier below is transmitted a signal to, voltage amplification is carried out.Multiplication factor is：
Further, due to inevitably resulting from noise, such as grating, circuit noise during signal acquisition
Deng these noises can influence accuracy, in order to obtain the heart sound that comparison is pure, improve signal to noise ratio, it is necessary to carry out noise reduction.Heart sound is believed
Number frequency be concentrated mainly between 20-600Hz, therefore design high-pass filter, cut-off frequency be 20Hz and low pass filter,
Cut-off frequency is 600Hz, can remove most noise.Specifically, referring to Fig. 5, it is filtered for band logical of the present utility model
The circuit diagram of wave circuit.The bandwidth-limited circuit includes the 3rd operational amplifier U4A and four-operational amplifier U5B, two fortune
The model identical of amplifier is calculated, all from OPA2277.Wherein, signal is input to the 3rd operation amplifier by resistance R5, R6
Device U4A normal phase input end, the 3rd operational amplifier U4A inverting input is grounded by resistance R8, and the 3rd computing is put
Big device U4A output end is connected by electric capacity C11 with resistance R6, forms feedback circuit, and connect by resistance R7 and resistance R8
Connect.3rd operational amplifier U4A output end is defeated by electric capacity C13, electric capacity C14 and four-operational amplifier U5B positive
Enter end connection, while electric capacity C14 is grounded by resistance R10；The inverting input of the four-operational amplifier U5B passes through
Resistance R11 is grounded；The output end of the four-operational amplifier U5B carries out signal output, while the four-operational amplifier U5B
Output end be connected by resistance R9 with electric capacity C14, while being connected by resistance R12 with resistance R11.
Further, in signal acquisition process, in extraneous interference, 50Hz Hz noise is especially prominent, therefore in circuit
One 50Hz of middle addition trap circuit, can effectively suppress 50Hz Hz noise.Specifically, referring to Fig. 6, it is the work
The circuit diagram of frequency trap circuit.The notch filter circuit includes：5th operational amplifier U5A and the 6th operational amplifier U6B,
Wherein described 5th operational amplifier U5A and the 6th operational amplifier U6B model is identical, all from OPA2277.Wherein input
Signal point two-way, sequentially passes through resistance R13, resistance R14, resistance R15 and resistance R16 and inputs the 5th operational amplifier U5A all the way
Normal phase input end, another road sequentially pass through electric capacity C15, electric capacity C16 and the 5th operational amplifier U5A normal phase input end connect
Connect.5th operational amplifier U5A output end carries out signal output, and the output end is connected with inverting input, and this
Five operational amplifier U5A output end is connected by resistance R19 with the 6th operational amplifier U6B normal phase input end.The resistance
R19 is grounded by resistance R20.The output end of the 6th operational amplifier U6B is connected with inverting input.In addition, the 6th
Operational amplifier U6B output end is divided into two-way, all the way after electric capacity C17 and electric capacity C18 parallel with one another with resistance R15
Connection, another road sequentially passes through resistance R18, resistance R17 and is connected with electric capacity C16.
Further, after the amplification and filtering by early stage, the intensity of signal is about 100mV or so, it is impossible at satisfaction
The requirement of reason, therefore, last plus a main amplification module, multiplication factor is
Because the input voltage range of A/D modular converters inside signal processing module is 0-3.3V, cardiechema signals must be inclined
The processing of next step could be carried out by putting to 0-3.3V, therefore signal is biased to suitable magnitude of voltage after main amplifying circuit.
Specifically, referring to Fig. 7, it is main amplification of the present utility model and biasing circuit.Described main amplification and biasing
Circuit includes the 7th operational amplifier U6A, the 8th operational amplifier U7B and the 9th operational amplifier U7A；7th computing is put
Big device U6A, the 8th operational amplifier U7B and the 9th operational amplifier U7A model are identical, all using OPA2277.Wherein, believe
Number it is connected with the 7th amplifier U6A inverting input by resistance R21, the normal phase input end of the 6th operational amplifier passes through
Resistance R23 is grounded；The output end of the 7th amplifier U6A is connected by resistance R22 with inverting input, while signal is defeated
Go out.7th amplifier U6A output end is connected by resistance R24 with the 8th operational amplifier U7B inverting input simultaneously；Institute
The normal phase input end for stating the 8th operational amplifier U7B is grounded by resistance R27；The output end of the 8th operational amplifier U7B
It is connected by resistance R26 and resistance R25 with inverting input.The output end of the 8th operational amplifier U7B passes through resistance R28
It is connected with the 9th operational amplifier U7A normal phase input end；The normal phase input end of the 8th operational amplifier U7B also passes through
Resistance R29 and resistance R32 are connected with+5V voltages, while being grounded by resistance R29 and resistance R33.9th operation amplifier
The inverting input of device is grounded by resistance R30.The output end of 9th operational amplifier passes through resistance R31 and anti-phase input
End connection.
Further, please refer to Fig. 8, it connects block diagram for the inside of signal processing module.The signal processing module
17 include analog-digital converter 171, digital filter 172, dma controller 173, heart rate and HRV computing modules 174, handover module
175 and bluetooth module 176.In the present embodiment, the signal processing module is STM32 minimum systems.
Wherein, the analog-digital converter 171, for analog signal to be converted into data signal.
The digital filter 172, for the elimination disturbed data signal.Digital filter is dry compared to hardware
Disturb small, and superior performance, be increased without hardware just can simply realize it is more multistage.The IIR that is designed with of conventional fixed frequency is filtered
Two kinds of ripple device and FIR filter, wherein FIR filter have good linear phase.But under the conditions of equal performance exponent number
Higher than IIR wave filter, operand is big.Therefore the notch filter of the design is designed using iir filter.By Matlab's
Fdatool kits can directly generate relevant parameter.C linguistic forms are translated into by direct II types again flat applied to STM32
Platform.
Meanwhile, also it is filtered processing using EMD algorithms.Found by contrast compared to wavelet decomposition, by EMD algorithms
The cardiechema signals better quality of processing, is more beneficial for follow-up work and processing, thus this program take the algorithm to fetal heart sound with
And adult's heart sound carries out separation noise reduction.
EMD algorithm intrinsic mode functions IMF needs to meet two attributes：(1) extreme point (maximum value or minimum value) of signal
Number and zero passage count out it is equal or it is most difference one；(2) the coenvelope line that is made up of local maximum and by local minimum
The average value for the lower envelope line that value is constituted is zero.Specific calculation procedure is as follows：
A. all maximum points and minimum point of former data sequence X (t) are found out, it is intended respectively with cubic spline function
It is combined into the upper and lower envelope of former sequence；The average of envelope is m1 up and down；Former data sequence is subtracted into available one of m1 to subtract
Go the new sequences h of low frequency, i.e. h1=X (t)-m1；
General h1 is not necessarily stable data sequence, is that this need to repeat said process to it.As h1 envelope average is
M11, then the data sequence removed after the average representative low-frequency component of the envelope is h11, i.e. h11=h1-m11.Repeat above-mentioned
Process, thus obtains first intrinsic mode functions component c1, and it represents the composition of signal data sequence highest frequency.
B. c1 is subtracted with X (t), obtains a new data sequence r1 for removing radio-frequency component；Above-mentioned decomposition is carried out again to r1,
Obtain second intrinsic mode functions component c2；So repeating a to the last data sequence rn can not be decomposed, now, rn generations
Table data sequence X (t) trend or average.Extreme point in the algorithm refers to the point that first derivative is zero.
The dma controller 173, for realizing the analog-digital converter to internal memory and the interior high-speed transfer for being stored to serial ports.
Because the frequency of heart sound is main in 20-600Hz, sample rate requires higher, and STM32 controls the transmission of sampling can not by CPU
Meet, therefore use DMA first and 4 two passages, ADC is realized respectively to internal memory and the interior high-speed transfer for being stored to serial ports, and
CPU can between sampling the phase realize the computings such as digital filtering, heart rate and HRV parameters.
Heart rate and HRV the parameter computing module 174, for calculating heart rate and HRV parameters.
The handover module 175, for carrying out pattern switching, the pattern includes：Adult, adult's heart sound envelope, fetal rhythm,
Five kinds of patterns of fetal rhythm envelope and lungs sound.
The bluetooth module 176, for realizing the communication connection with extraneous terminal.
Specifically, referring to Fig. 9, it is the circuit diagram of the STM32 minimum systems of the present embodiment.Wherein, the STM32
Minimum system circuit includes process chip STM32F103T8C6.The process chip include power port, signal input port and
Signal output port.Meanwhile, referring to Fig. 10, its partial enlarged drawing for the Bluetooth circuit socket of process chip.The processing
Bluetooth circuit interface is additionally provided with chip, it is convenient to be communicated with extraneous mobile terminal for connecting Bluetooth circuit.
Further, for result that the data realized to electronic auscultation device are shown and diagnosed.Figure 11 is referred to, it is
The module connection block diagram of electronic auscultation system of the present utility model.The utility model additionally provides a kind of multifunction electronic auscultation system
System, it includes above-mentioned multi-purpose electronic stethoscope 1, mobile terminal 2 and computer terminal 3.
Please refer to Figure 12, it connects block diagram for the inside of mobile terminal of the present utility model.The mobile terminal 2 is wrapped
Include Bluetooth receptions module 21, data visualization module 22, user and contact person's setup module 23, positioning and send urgent message mould
Block 24, analysis module 25 and high in the clouds memory module 26.
The Bluetooth receptions module 21, the gathered data signal for receiving the electronic auscultation device.
The data visualization module 22, for display data information.
User and the contact person setup module 23, the information for setting user and contact person.
The urgent short breath module 24 of positioning and transmission, for obtaining location information, and sends urgent short breath.
The analysis module 25, for analyzing receiving data, draws diagnostic result.
The high in the clouds memory module 26, is uploaded in the memory of high in the clouds for will receive data.
Please refer to Figure 12, it connects block diagram for the inside of computer terminal of the present utility model.Wrap the computer terminal 3
Include：Receiving module 31, recording and playback module 32, waveform display module 33 and analysis module 34.
The receiving module 31, for being connected by tone frequency channel wire with the electronic auscultation device, for receiving audio signal；
The recording and playback module 32, the recording and playback of the voice signal for realizing hardware circuit collection；
The waveform display module 33, for showing sound waveform figure in waveform frame in real time；
The analysis module 34, for realizing signal analysis and processing, draws corresponding physiological parameter and diagnosis.
Compared to prior art, the utility model possesses following beneficial effect：
5. gathering the cardiechema signals of different age group crowd in the way of passive unperturbed formula, and it can monitor in real time.
6., can using common can plus Electret condenser microphone with regard to the heart sound acquisition probe of an excellent performance can be constituted
Cardiechema signals are converted into electric signal, fetal heart sound of the pregnancy more than more than 20 weeks is can detect, compares existing Doppler type heart sound
Survey meter, passive detection mode is radiationless, and the influence to human body is minimized.
7. cardiechema signals can be extracted precisely, cardiechema signals peak intervals are obtained, knowledge HRV are debated, mobile terminal is real-time
Visualize waveform, data and provide offline diagnosis report, possess emergency alarm measure.
8. employing STM32, the high precision chip such as OPA2277, the cardiechema signals collected are handled by hardware components
Into data, the cardiechema signals collected are processed into data by hardware components, and the APP and computer of mobile phone can be shown in real time
Deng host computer, terminal can be recorded (and display waveform) to cardiechema signals, be played back, Modern Signal Analysis and diagnosis, with adaptive
Induction signal processing scheme is foundation, depth analysis cardiechema signals feature.
9. heart sound data can be carried out, mobile phone, computer be local and the storage of high in the clouds multidimensional, thus collection signal is carried out in real time or
Remote online/offline diagnosis.
6th, terminal APP can show heart rate in real time, and the Cardiac disease such as cardiac parameter, SDNN and SDANN judges parameter,
Have positioning in real time and the automatic function of sending short message, when having detected emergency, can send and navigate in advance simultaneously
Among the Familiarity Number kept, household is notified.
The utility model is not limited to above-mentioned embodiment, if do not taken off to various changes or deformation of the present utility model
From spirit and scope of the present utility model, if these are changed and deformation belongs to claim of the present utility model and equivalent technologies
Within the scope of, then the utility model is also intended to comprising these changes and deformed.
Claims (8)
1. a kind of multi-purpose electronic stethoscope, it is characterised in that：Including power generation circuit, auscultation head, primary amplifying circuit, band
Bandpass filter circuit, notch filter circuit, main amplification and voltage offset electric circuit, signal processing module；
The power generation circuit, for being that primary amplifying circuit and signal processing module are powered；
The auscultation head is used for and human contact, and human body cardiechema signals or tire message number are sent to primary amplifying circuit；
The primary amplifying circuit, for the signal of collection to be amplified, and transmits the signal to bandwidth-limited circuit；
The bandwidth-limited circuit, the signal for collection carries out noise reduction process, and transmits the signal to notch filter circuit；
The notch filter circuit, carries out AF panel, and transmit the signal to main amplifying circuit for the signal to collection；
The main amplification and voltage offset electric circuit, are amplified for the signal to collection, and the magnitude of voltage after amplification is biased
To the magnitude of voltage of setting, retransmit to signal processing module；
The signal processing module, is handled and A/D conversions for the signal to collection.
2. multi-purpose electronic stethoscope according to claim 1, it is characterised in that：The power generation circuit includes the dry electricity of 9V
Pond, the first voltage stabilizing chip, the second voltage stabilizing chip and charge pump reversed polarity switch integrated regulator；First voltage stabilizing chip and institute
State dry cell connection, generation+5V voltage；The charge pump reversed polarity switch integrated regulator and first voltage stabilizing chip
Output voltage is connected, generation -5V voltages；Second voltage stabilizing chip is connected with the output voltage of first voltage stabilizing chip, production
Raw 3.3V voltages；It is that primary amplifying circuit is powered, the 3.3V voltages are the signal transacting mould that the+5V, -5V voltages, which are used for,
Block is powered.
3. multi-purpose electronic stethoscope according to claim 1, it is characterised in that：The primary amplifying circuit is put for triode
Big circuit.
4. multi-purpose electronic stethoscope according to claim 1, it is characterised in that：The primary amplifying circuit is amplified for amplifier
Circuit；The amplifier amplifying circuit includes：Operational amplifier, first resistor R1, second resistance R2,3rd resistor R3, the 4th electricity
Hinder R4, the first electric capacity C9, the second electric capacity C10；The inverting input of the operational amplifier successively with second resistance R2, second electricity
Hold C10, first resistor R1, the first electric capacity C9 connections；The normal phase input end of the operational amplifier is connected with 3rd resistor；It is described
The output end of operational amplifier is connected by the 4th resistance R4 with the inverting input.
5. multi-purpose electronic stethoscope according to claim 1, it is characterised in that：The bandwidth-limited circuit be 20Hz~
600Hz bandwidth-limited circuit.
6. multi-purpose electronic stethoscope according to claim 1, it is characterised in that：The notch filter circuit falls into for 50Hz's
Wave circuit.
7. multi-purpose electronic stethoscope according to claim 1, it is characterised in that：The main amplification and biasing circuit believe this
Number voltage magnitude amplifies 7.5 times, and signal voltage is biased into 0~3.3V.
8. multi-purpose electronic stethoscope according to claim 1, it is characterised in that：The signal processing module turns including modulus
Parallel operation, digital filter, dma controller, heart rate and HRV computing modules, handover module and bluetooth module；
The analog-digital converter, for analog signal to be converted into data signal；
The digital filter, for the elimination disturbed data signal；
The dma controller, for realizing the analog-digital converter to internal memory and the interior high-speed transfer for being stored to serial ports；
Heart rate and HRV the parameter computing module, for calculating heart rate and HRV parameters；
The handover module, for carrying out pattern switching, the pattern includes：Adult, adult's heart sound envelope, fetal rhythm, fetal rhythm bag
Five kinds of patterns of network and lungs sound；
The bluetooth module, for realizing the communication connection with extraneous terminal.
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| CN201621090075.4U CN206499478U (en) | 2016-09-28 | 2016-09-28 | Multi-purpose electronic stethoscope |
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| CN201621090075.4U CN206499478U (en) | 2016-09-28 | 2016-09-28 | Multi-purpose electronic stethoscope |
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| CN206499478U true CN206499478U (en) | 2017-09-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106510751A (en) * | 2016-09-28 | 2017-03-22 | 华南师范大学 | Multifunctional electronic stethoscope and auscultation system |
| WO2020151169A1 (en) * | 2019-01-23 | 2020-07-30 | 苏州美糯爱医疗科技有限公司 | Method for automatic removal of frictional sound interference of electronic stethoscope |
-
2016
- 2016-09-28 CN CN201621090075.4U patent/CN206499478U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106510751A (en) * | 2016-09-28 | 2017-03-22 | 华南师范大学 | Multifunctional electronic stethoscope and auscultation system |
| WO2020151169A1 (en) * | 2019-01-23 | 2020-07-30 | 苏州美糯爱医疗科技有限公司 | Method for automatic removal of frictional sound interference of electronic stethoscope |
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Granted publication date: 20170919 Termination date: 20210928 |