CN107260206A - Electronic type stethoscope based on MEMS sound sensing principles - Google Patents
Electronic type stethoscope based on MEMS sound sensing principles Download PDFInfo
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- CN107260206A CN107260206A CN201710553457.9A CN201710553457A CN107260206A CN 107260206 A CN107260206 A CN 107260206A CN 201710553457 A CN201710553457 A CN 201710553457A CN 107260206 A CN107260206 A CN 107260206A
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- signal
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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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B7/00—Instruments for auscultation
- A61B7/003—Detecting lung or respiration noise
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Engineering & Computer Science (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Pulmonology (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Abstract
It is of the invention to fix installation voicing sensor micro-structural in the pickup casing of polyurethane entrant sound cap and encapsulation base plate, pickup casing respectively for a kind of electronic type stethoscope based on MEMS sound sensing principles, including two ends and simultaneously fill silicone oil；Pickup casing connects hand-held supports body by the cylindricality connecting tube of built-in lead, signal processing circuit board and power supply are installed in hand-held supports body, signal processing circuit board is by lead and sonic transducer microstructure brazing, and power supply is that signal processing circuit board harmony sensor microstructure is powered.Stethoscope of the present invention is that the acoustic sensor processed by the use of MEMS technology is used as the sensing element for receiving acoustical signal, and on binding signal process circuit plate each module processing function, make the heart and lung sounds signal received more accurate, the heart sound collected in real time, heart rate and breath sound signal are sent in client by bluetooth module simultaneously and is shown and analyzed in real time, and the conventional parameters such as heart rate are calculated by respective algorithms.
Description
Technical field
The present invention relates to a kind of intelligent biological medical device, specifically a kind of electronic type based on MEMS sound sensing principles is listened
Examine device.
Background technology
The Main Diagnosis means clinically to cardiovascular and cerebrovascular and respiratory disease are still to heart sound and breathing at present
The auscultation of sound.Stethoscope is still the Main Means and instrument that numerous doctors judge patient, and conventional stethoscope is mainly doctor's dependence
Beats calculate heart rate, and signal is extremely faint, and LF-response is poor, and diagnosis is largely dependent upon the subjectivity of doctor
Judge, and human ear has congenital limitation（The most sensitive frequency range of the sense of hearing is between 1kHz-3kHz）, it is quick for low-frequency sound
Perception is poor, and the heart sound frequency range for having clinical value often concentrates on 20Hz-600Hz, thus some have important diagnostic meaning
Low frequency and the less heart sound of intensity（Such as second heart sound）Pathological characters be difficult to catch.
The content of the invention
The invention aims to solve above-mentioned problems of the prior art, and provide a kind of based on MEMS sound biography
Feel the electronic type stethoscope of principle.Stethoscope of the present invention be based on MEMS technology design one kind can auscultation can show in real time again
The high s/n ratio of oscillography shape, inexpensive electronic auscultation device.
The present invention is achieved through the following technical solutions：
A kind of electronic type stethoscope based on MEMS sound sensing principles, it is characterised in that：Including pickup casing, polyurethane entrant sound
Cap, encapsulation base plate, sonic transducer micro-structural, cylindricality connecting tube and hand-held supports body；The two ends of pickup casing are set to be open,
Oil filler point is offered on the shell wall of pickup casing；Polyurethane entrant sound cap is packaged in the open at one end end of pickup casing, encapsulation
Base is packaged in the other end opening end of pickup casing；Sonic transducer micro-structural is located in pickup casing and passes through circle
Pcb board is fixed on encapsulation base plate, and sonic transducer micro-structural includes rectangular support frame, rectangle foil gauge, cantilever beam and pressure-sensitive electricity
Resistance, rectangular support frame is fixed on circular pcb board, and rectangle foil gauge is suspended in the centre bit of rectangular support frame by cantilever beam
Put, piezo-resistance has four, and two of which is distributed on cantilever beam, remaining two are distributed in the rectangle branch being connected with cantilever beam
On the frame side of support frame, four piezo-resistances connect into a Wheatstone bridge；One end of cylindricality connecting tube and pickup casing
Shell wall connection, the other end and hand-held supports body are connected, and are worn in cylindricality connecting tube leaded；Signal is installed in hand-held supports body
Power supply voltage supply module, adjustable stabilized voltage supply module, signal are installed on process circuit plate and power supply, signal processing circuit board
Conditioning module, signal acquisition module, data memory module and bluetooth module；Signal processing circuit board passes through in cylindricality connecting tube
Lead and sonic transducer microstructure brazing, power supply are that signal processing circuit board and sonic transducer micro-structural are powered；Pick-up head
The internal cavities of housing fill the silicone oil with good sound conductive performance by oil filler point.
The sonic transducer micro-structural that stethoscope of the present invention processes MEMS technology is used in stethoscopic as sensing unit
Audition part, as the reception device of cardiechema signals, is realized to cardiechema signals by the cooperation of signal condition and signal acquisition
Collection, signal comes out through Signal-regulated kinase first, then to signal acquisition module processing, then send bluetooth module to pass through signal
Respective algorithms processing, finally realizes that waveform is shown and heart rate digital is calculated on cell-phone customer terminal APP.
As preferred technical scheme, the external form of pickup casing is round table-like, and polyurethane entrant sound cap is packaged in pick-up head
The big open end end of housing, encapsulation base plate is packaged in the small opening end of pickup casing.
Stethoscope of the present invention be by the use of MEMS technology process acoustic sensor as receive acoustical signal sensing element, and
The processing function of each module, makes the heart and lung sounds signal heard more accurate on binding signal process circuit plate, while passing through bluetooth mould
The heart sound collected in real time, heart rate and breath sound signal are sent in client and are shown and analyzed in real time by block, and pass through
Respective algorithms calculate the conventional parameters such as heart rate.The stethoscopic function of the present invention shows the stethoscopic practicality of MEMS, in the future
Preliminary diagnostic result can be provided further combined with clinical experience, to improve the standard of heart disease diagnosis or the monitoring of children's fetal rhythm
True property.In addition, stethoscope of the present invention has the high and low cost of small volume, sensitivity, can be wirelessly transmitted to the clients such as mobile phone and show
The advantage of waveform and heart sound numerical characteristic, it is more apparent than conventional stethoscope detection heart rate, more convenient.
Brief description of the drawings
Fig. 1 is stethoscopic structure schematic diagram of the invention.
Fig. 2 is stethoscopic positive structure schematic of the invention.
Fig. 3 is circular pcb board and the structural representation of sonic transducer micro-structural in stethoscope of the present invention.
Fig. 4 is each module connection block diagram on signal processing circuit board in stethoscope of the present invention.
Fig. 5 is the Stress Map of sonic transducer micro-structural in stethoscope of the present invention.
Fig. 6 is the first-order modal figure of sonic transducer micro-structural in stethoscope of the present invention.
Fig. 7 is the cantilever beam and rectangle foil gauge upper stress curve map of sonic transducer micro-structural in stethoscope of the present invention.
Fig. 8 is the Harmony response curve map of sonic transducer micro-structural in stethoscope of the present invention.
In figure：1- pickups casing, 2- polyurethane entrant sounds cap, 3- encapsulation base plates, 4- sonic transducers micro-structural, 4-1- are pressure-sensitive
Resistance, 4-2- rectangular supports frame, 4-3- rectangles foil gauge, 4-4- cantilever beams, 5- cylindricalitys connecting tube, 6- hand-held supports body, 7- notes
The circular pcb board of oilhole, 8-, 9- signal processing circuit boards, 10- power supplies.
Specifically mode
The present invention is further described below in conjunction with accompanying drawing：
As shown in Figures 1 to 4, a kind of electronic type stethoscope based on MEMS sound sensing principles, including pickup casing 1, poly- ammonia
Ester entrant sound cap 2, encapsulation base plate 3, sonic transducer micro-structural 4, cylindricality connecting tube 5 and hand-held supports body 6.
Pickup casing 1 is made by aluminum alloy material, and the external form of pickup casing 1 is round table-like, and two above and below it
Hold and set for opening, wherein, upper end is small opening end, and lower end is to offer oiling on big open end end, the shell wall of pickup casing 1
Hole 7.
Polyurethane entrant sound cap 2 is bonded and fixed at the big open end end of pickup casing 1 by polyurethane sealant, for contacting
Human body and conduct heart sound or lungs sound；Encapsulation base plate 3 is made by aluminum alloy material, and encapsulation base plate 3 passes through thread seal circle spiral shell
Line is connected to the small opening end of pickup casing 1.
Sonic transducer micro-structural 4 is in pickup casing 1 and is fixed on by circular pcb board 8 on encapsulation base plate 3, sound
Sensor microstructure 4 is used to heart sound being converted to electric signal；Sonic transducer micro-structural 4 includes rectangular support frame 4-2, rectangle and strained
Piece 4-3, cantilever beam 4-4 and piezo-resistance 4-1, rectangular support frame 4-2 are fixed on circular pcb board 8, and rectangle foil gauge 4-3 leads to
Cross the center that cantilever beam 4-4 is suspended in rectangular support frame 4-2, rectangle foil gauge 4-3 four sides respectively with rectangular support
Frame 4-2 four frame sides be arranged in parallel, and the centre position of cantilever beam 4-4 one end and rectangle foil gauge 4-3 wherein one side is consolidated
Fixed connection, the cantilever beam 4-4 other end is fixedly connected with the centre position on corresponding rectangular support frame 4-2 frame side, and rectangle should
Become piece 4-3 one fanning strip of formation；Piezo-resistance 4-1 has four, and two of which is distributed on cantilever beam 4-4, remaining two
On the frame side for being distributed in the rectangular support frame 4-2 being connected with cantilever beam 4-4, four piezo-resistance 4-1 connect into a favour stone
Electric bridge；The rapidoprint of sonic transducer micro-structural 4 is soi wafer, is processed using MEMS micro-processing technology, is specifically in silicon
On substrate rectangular support frame 4-2, rectangle foil gauge 4-3 are etched using ICP plasma etching technologies and for connecting rectangle
Carriage 4-2 and rectangle foil gauge 4-3 cantilever beam 4-4, it is sharp respectively on cantilever beam 4-4 and rectangular support frame 4-2 frame side
With Plasma inpouring technology injection boron ion formation piezo-resistance 4-1, four piezo-resistance 4-1 resistance it is equal and between pass through
Metal lead wire connects into the favour stone full-bridge differential circuit of a detection cardiopulmonary acoustical signal.When the heart sound vibration signal of varying strength
When being delivered to the sonic transducer micro-structural 4 in the cavity of pickup casing 1 through silicone oil by polyurethane entrant sound cap, rectangle is caused to strain
Piece 4-3 swings up and down bending, and vibration signal is passed into high-precision cantilever beam 4-4, and cantilever beam 4-4 upper stresses change,
The resistance of piezo-resistance on corresponding cantilever beam 4-4 changes, and the output voltage values of Wheatstone bridge also synchronously become
Change, so as to reach the purpose for differentiating not coaural signal.According to the collection of a period of time output voltage values corresponding with the time, just
The heartbeat waveform figure of heart sound vibration signal can be drawn out, hrv parameter can be drawn by calculating.
One end of cylindricality connecting tube 5 is connected with the shell wall of pickup casing 1, the other end and hand-held supports body 6 are connected, cylindricality
Worn in connecting tube 5 leaded.
Hand-held supports body 6 is made up of plastic material, facilitates the hand-held stethoscope diagnosis patient of doctor, hand-held supports
Signal processing circuit board 9 and power supply 10 are installed, signal processing circuit board 9 passes through the lead in cylindricality connecting tube 5 in body 6
It is connected with sonic transducer micro-structural 4, power supply 10 is respectively that signal processing circuit board 9 and sonic transducer micro-structural 4 are powered；Letter
Number process circuit plate 9 be installed on the back position of hand-held supports body 6, signal processing circuit board 9 be provided with power supply voltage supply module,
Adjustable stabilized voltage supply module, Signal-regulated kinase, signal acquisition module, data memory module and bluetooth module, wherein, power supply is supplied
The power input of die block is connected with power supply 10, power output end and the adjustable stabilized voltage supply module of power supply voltage supply module
Power input connection, the power output end of adjustable stabilized voltage supply module respectively with Signal-regulated kinase, signal acquisition module,
The power input connection of data memory module, bluetooth module and sonic transducer micro-structural 4, the letter of sonic transducer micro-structural 4
The signal input part of number output end and Signal-regulated kinase is connected, the signal output part and signal acquisition module of Signal-regulated kinase
Signal input part connection, the signal input part and indigo plant of the signal output part of signal acquisition module respectively with data memory module
The signal input part connection of tooth module；The power supply 10 of power supply voltage supply module passes through adjustable stabilized voltage supply module by dc source
Voltage-regulation supplies sonic transducer micro-structural 4 and signal processing circuit board 9 to corresponding amplitude,；By Signal-regulated kinase,
The cooperation of signal acquisition module is realized to be gathered to the amplifications of cardiechema signals, and signal comes out through Signal-regulated kinase first, then to letter
The processing of number acquisition module, is stored to data memory module after then data-signal is handled by respective algorithms, while also can be by
Data are transferred on mobile phone A PP by bluetooth module, and bluetooth module controls Bluetooth chip by signal acquisition module, with mobile phone visitor
Family end is matched, and finally realizes that heart sound and breath sound waveform are shown and heart rate digital is calculated on cell-phone customer terminal APP.Simultaneously as
The effect of amplifying circuit, small-signal is accordingly amplified, observation of being more convenient for.Signal acquisition module is to be transformed into numeral by analog quantity
Amount, is that memory module below and bluetooth digital transmission module prepare, signal acquisition module is using stm32 single-chip microcomputers, and it is integrated with
ADC, reduces the volume that single ADC devices take, while also bluetooth module obtains data transfer to the control of stm32 single-chip microcomputers；
Power supply 10 includes being opened in the positive battery case of hand-held supports body 6, battery case being provided with battery, and battery notch installs electricity
Chi Gai, the power output end of battery is connected with the power input of power supply voltage supply module.
The internal cavities of pickup casing 1 fill the silicone oil with good sound conductive performance by oil filler point 7, oil filler point and
Pickup casing 1 and the fairlead of the junction of cylindricality connecting tube 5 carry out sealing setting.
Fig. 5 is the Stress Map of a certain physical dimension emulation of sonic transducer micro-structural in stethoscope of the present invention, and Fig. 7 is this hair
Cantilever beam upper stress curve map in bright stethoscope under sonic transducer micro-structural corresponding size, from Fig. 5 and Fig. 7 it was found from, its is anti-
Cantilever beam upper stress has been answered to be distributed, so that it is determined that the correct position of arrangement piezo-resistance.Fig. 6 is sound biography in stethoscope of the present invention
First-order modal figure under sensor micro-structural corresponding size, Fig. 8 is under sonic transducer micro-structural corresponding size in stethoscope of the present invention
Harmony response curve map, it was found from Fig. 6 and Fig. 8, it has reacted the intrinsic frequency of structure, specially 4300hz, cardiechema signals model
It is 20-600Hz to enclose, and intrinsic frequency is more than this scope, illustrates to meet band requirement, meets diagnosis and requires.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail.It should be pointed out that within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc.,
It should be included in the scope of the protection.
Claims (2)
1. a kind of electronic type stethoscope based on MEMS sound sensing principles, it is characterised in that：Including pickup casing（1）, poly- ammonia
Ester entrant sound cap（2）, encapsulation base plate（3）, sonic transducer micro-structural（4）, cylindricality connecting tube（5）With hand-held supports body（6）；Pick-up head
Housing（1）Two ends set to be open, pickup casing（1）Shell wall on offer oil filler point（7）；Polyurethane entrant sound cap（2）
It is packaged in pickup casing（1）Open at one end end, encapsulation base plate（3）It is packaged in pickup casing（1）Other end opening end；
Sonic transducer micro-structural（4）Located at pickup casing（1）It is interior and pass through circular pcb board（8）It is fixed on encapsulation base plate（3）On, sound
Sensor microstructure（4）Including rectangular support frame（4-2）, rectangle foil gauge（4-3）, cantilever beam（4-4）And piezo-resistance（4-
1）, rectangular support frame（4-2）It is fixed on circular pcb board（8）On, rectangle foil gauge（4-3）Pass through cantilever beam（4-4）It is suspended in square
Shape carriage（4-2）Center, piezo-resistance（4-1）Four are had, two of which is distributed in cantilever beam（4-4）On, remain
Remaining two be distributed in and cantilever beam（4-4）The rectangular support frame of connection（4-2）Frame side on, four piezo-resistances（4-1）Connection
Into a Wheatstone bridge；Cylindricality connecting tube（5）One end and pickup casing（1）Shell wall connection, the other end and hand-held branch
Support body（6）Connection, cylindricality connecting tube（5）Inside wear leaded；Hand-held supports body（6）Signal processing circuit board is inside installed（9）
And power supply（10）, signal processing circuit board（9）On be provided with power supply voltage supply module, adjustable stabilized voltage supply module, signal adjust
Manage module, signal acquisition module, data memory module and bluetooth module；Signal processing circuit board（9）Pass through cylindricality connecting tube（5）
Interior lead and sonic transducer micro-structural（4）Connection, power supply（10）For signal processing circuit board and sonic transducer micro-structural
（4）Power supply；Pickup casing（1）Internal cavities pass through oil filler point（7）Fill the silicone oil with good sound conductive performance.
2. the electronic type stethoscope according to claim 1 based on MEMS sound sensing principles, it is characterised in that：Pickup head capsule
Body（1）External form be round table-like, polyurethane entrant sound cap（2）It is packaged in pickup casing（1）Big open end end, encapsulation base plate（3）
It is packaged in pickup casing（1）Small opening end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710553457.9A CN107260206B (en) | 2017-07-08 | 2017-07-08 | Electronic stethoscope based on MEMS (micro-electromechanical systems) sound sensing principle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710553457.9A CN107260206B (en) | 2017-07-08 | 2017-07-08 | Electronic stethoscope based on MEMS (micro-electromechanical systems) sound sensing principle |
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| CN107260206A true CN107260206A (en) | 2017-10-20 |
| CN107260206B CN107260206B (en) | 2020-09-15 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108514428A (en) * | 2018-04-12 | 2018-09-11 | 清华大学 | Gurgling sound harvester |
| CN108735307A (en) * | 2018-05-25 | 2018-11-02 | 山东锋士信息技术有限公司 | A kind of tcm health preserving health care wisdom cloud service system based on big data |
| CN109091135A (en) * | 2018-07-17 | 2018-12-28 | 中北大学 | The miniature in-situ synchronization detection sensor of heart sound electrocardio based on MEMS technology |
| CN109717892A (en) * | 2017-10-27 | 2019-05-07 | 榆林学院 | A kind of MEMS auscultation probe micro-structure based on sonic transducer |
| CN109745068A (en) * | 2019-03-18 | 2019-05-14 | 西安电子科技大学 | A kind of domestic portable fetal heart sound monitoring system |
| CN112957066A (en) * | 2021-02-10 | 2021-06-15 | 中北大学 | Electronic stethoscope based on n-type cantilever beam type one-dimensional MEMS (micro-electromechanical systems) acoustic sensor |
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| CN106236130A (en) * | 2016-08-30 | 2016-12-21 | 苏州中盛纳米科技有限公司 | A kind of electronic type stethoscope based on MEMS technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109717892A (en) * | 2017-10-27 | 2019-05-07 | 榆林学院 | A kind of MEMS auscultation probe micro-structure based on sonic transducer |
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| CN109745068A (en) * | 2019-03-18 | 2019-05-14 | 西安电子科技大学 | A kind of domestic portable fetal heart sound monitoring system |
| CN112957066A (en) * | 2021-02-10 | 2021-06-15 | 中北大学 | Electronic stethoscope based on n-type cantilever beam type one-dimensional MEMS (micro-electromechanical systems) acoustic sensor |
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