CN102772222A - Electronic stethoscope - Google Patents
Electronic stethoscope Download PDFInfo
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- CN102772222A CN102772222A CN2011101217587A CN201110121758A CN102772222A CN 102772222 A CN102772222 A CN 102772222A CN 2011101217587 A CN2011101217587 A CN 2011101217587A CN 201110121758 A CN201110121758 A CN 201110121758A CN 102772222 A CN102772222 A CN 102772222A
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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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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B7/00—Instruments for auscultation
- A61B7/02—Stethoscopes
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Abstract
本发明提供一种电子听诊器，包括：听诊头，其用于在听诊时与体表接触，使脏器发出的经过体表辐射的声信号产生谐振，并将谐振声信号转换为电信号；主机，其用于对通过听诊头转换的电信号进行放大和滤波处理，并将处理后的电信号转换为声信号；扬声器，其用于播放通过主机转换的声信号。根据本发明的电子听诊器可监听和记录心音、肠鸣音、肺音、胎心音等多种脏器发出的多种频率的声音，适用于多种疾病的诊断，并且结构简单，使用方法也简单，而且还可有效地隔绝外界噪声，从而提高诊断的准确性。
The invention provides an electronic stethoscope, comprising: a stethoscope head, which is used to contact the body surface during auscultation, so as to resonate the acoustic signals emitted by organs and radiated by the body surface, and convert the resonant acoustic signals into electrical signals; , which is used to amplify and filter the electrical signal converted by the stethoscope head, and convert the processed electrical signal into an acoustic signal; a speaker, which is used to play the acoustic signal converted by the host. According to the electronic stethoscope of the present invention, it can monitor and record sounds of multiple frequencies from various organs such as heart sounds, bowel sounds, lung sounds, fetal heart sounds, etc., and is applicable to the diagnosis of various diseases, and has a simple structure and easy usage. Simple, and can effectively isolate external noise, thereby improving the accuracy of diagnosis.
Description
Technical field
The present invention relates to technical field of medical instruments, particularly a kind of electronic stethoscope.
Background technology
Stethoscope is to utilize air to import faint sound into the people ear through pipeline as media.But because some faint but very important biologies (the strong borborygmus of for example irregular periodicity and randomness) that the inside of human body internal organs send; Bring very big difficulty to clinical practice; Cause the doctor can't in time make diagnosis; And the foundation of diagnosis is mainly according to doctor's experience, and accuracy is relatively poor.Say that from another angle people's ear is the comprehensive effect of the sound intensity and frequency to the sensitivity of sound, thereby only through traditional stethoscope, some pathological characters are difficult to catch.Therefore, need design the electronic stethoscope that can carry out quantitatively auscultatory sound, accurately analyze.For example; " in " based on the borborygmus Acquisition System Design of C8051F340 single-chip microcomputer " literary composition that 2008 32 volumes of Chinese medical apparatus journal the 3rd periodical is stepped on a kind of equipment of monitoring borborygmus is being disclosed; This equipment choosing C8051F340 single-chip microcomputer utilizes electret formula condenser microphone to pick up intestinal toot tone signal as probe as microcontroller.This system in the active zone design of bowel movement 8 passages, and with these 8 microphone fixing on a softish bellyband, realize to borborygmus real-time collection, show and store.Again for example, stepped on " cardiechema signals based on the HKY06A heart sound transducer extracts " literary composition, disclose a kind of HKY06A type heart sound transducer at " Chinese medical equipment " 2008 the 32nd volumes the 3rd periodical.This pick off adopts novel high polymer polymeric material microphony sensing element to gather heartbeat and other body surface arteriopalmus signal, handles through the Highgrade integration signal processing circuit again.Output low impedance power signal can directly drive earphone, and also can connect computer and record, and with Mp3 or Wav format.Can write down cardiechema signals and see the hear sounds collection of illustrative plates through recording software, carry out atlas analysis.
Again for example; A kind of cardiophone of being made up of mobile terminal device and PC is disclosed in application number is 200910199630.5 one Chinese patent application " Bluetooth electronic cardiophone "; But this cardiophone is real-time play hear sounds and demonstration phonocardiogram not only, also can carry out computer-aided diagnosis.
As stated, the sound that utilizes human internal organ to send carries out medical diagnosis, is obtaining certain achievement at present.But; Ubiquitous deficiency is exactly the sound that a kind of stethoscope only can a kind of internal organs of auscultation sends; And the sound of the multiple frequency of can not the multiple internal organs of auscultation being sent, and the stethoscopic device structure of existing digitized is all comparatively complicated, is not suitable for the doctor and uses separately.In addition, existing electronic stethoscope receives the outside noise influence easily, causes diagnosing inaccurate.
Summary of the invention
In order to address the above problem; The present invention provides a kind of Mobyneb electronic stethoscope simple in structure; Through this electronic stethoscope; Need not directly can monitor and the sound of the multiple frequency that multiple internal organs such as record, hear sounds, borborygmus, lungs sound, fetal heart sound send, and can show the relevant information of these sound with couplant is radiationless.
In order to realize above purpose, electronic stethoscope provided by the invention comprises: the auscultation head, and it is used for when auscultation, contacting with body surface, and what make that internal organs send produces resonance through the radiating acoustical signal of body surface, and is the signal of telecommunication with the resonant acoustic conversion of signals; Main frame, it is used for amplifying and Filtering Processing through an auscultation electrical signal converted, and the electrical signal conversion after will handling is an acoustical signal; Speaker, it is used to play the acoustical signal through the main frame conversion.
Preferably, said auscultation head comprises: the resonator cavity housing, and its acoustical signal that is used to internal organs are sent produces resonance, to obtain the resonant acoustic signal; Responant diaphragm; It is used for the sealed cavity housing, and when auscultation, contacts with body surface, the air column of acoustical signal in body surface radiates pusher dynamic resonance cavity shell that internal organs are sent; Make air column produce the continuous checker effect of expanding and compressing, thereby produce resonance; The audio collection microphone, it is used to gather the resonant acoustic signal that obtains through the resonator cavity housing, and is the signal of telecommunication with this resonant acoustic conversion of signals.
Preferably, said audio collection microphone is contained in the resonator cavity housing.
Preferably, said audio collection microphone and responant diaphragm relatively are connected the bottom of resonator cavity housing.
Preferably, said resonator cavity housing overcoat is useful on sound damping internal layer shell, and said internal layer shell is with responant diaphragm sealed cavity housing and audio collection microphone.
Preferably, the audio collection microphone in the said internal layer shell is in suspended state.
Preferably, also be provided with in the said internal layer shell and be used to wrap up the sound-absorbing material of audio collection microphone and be used for audio collection microphone and sound-absorbing material are fixed on the pressing plate between resonator cavity housing bottom and the internal layer shell.
Preferably, said internal layer shell is provided with outer casing outward, is that sealed hollow is perhaps for carrying out the closed chamber of application of vacuum or inert gas injecting between said internal layer shell and the outer casing.
Preferably; Between said internal layer shell and outer casing, also be provided with elastic connection structure, the resonator cavity housing, the whole suspended state that is in of the harmonious vibrating diaphragm of audio collection microphone that make internal layer shell and the inside thereof to utilize internal layer shell to be connected with elasticity between the outer casing.
Preferably, said elastic connection structure comprises connecting ring and the support column that is used for elasticity connection internal layer shell and outer casing.
Preferably, said connecting ring adopts rubber or silica gel or PU material, and said support column adopts rubber or silica gel.
Preferably, said resonator cavity outside is provided with sound-absorbing material.
Preferably, said audio collection microphone is an electret capacitor type audio collection microphone.
Preferably, said resonator cavity housing is formed by metal material or nonmetallic materials.
Preferably, said resonator cavity housing is in following: cylindricality benzvalene form resonator cavity housing, square or cuboid resonator cavity housing, tubaeform resonator cavity housing.
Preferably, said main frame comprises: control circuit, and it is used for amplifying and Filtering Processing through audio collection microphone electrical signal converted, and the electrical signal conversion after will handling is an acoustical signal; Power pack, it is used to the audio collection microphone and control circuit provides power supply.
Preferably, said control circuit comprises: pre-amplification circuit, and it is used for amplifying through audio collection microphone electrical signal converted; Filter circuit, it is used for the signal of telecommunication that amplifies is carried out filtering; Power amplification circuit, it is used for the electrical signal conversion through filtering is acoustical signal.
Preferably, said control circuit also comprises: digital signal circuit, and it is used for said electrical signal conversion through filtering is digital signal; And display screen, it is used to show the digital signal through the digital signal circuit conversion.
The sound of the multiple frequency that multiple internal organs such as hear sounds, borborygmus, lungs sound, fetal heart sound send can monitored and write down to electronic stethoscope provided by the present invention; And can show the relevant information of these sound; Be applicable to the diagnosis of multiple disease, and simple in structure, and method for using is also simple.In addition, electronic stethoscope provided by the present invention can completely cut off outside noise effectively, thereby improves the accuracy of diagnosis.
Description of drawings
Fig. 1 is the structure chart according to the electronic stethoscope of the first embodiment of the present invention;
Fig. 2 a, Fig. 2 b and Fig. 2 c, Fig. 2 d are the profiles according to the receiver of the first embodiment of the present invention;
Fig. 3 is the structure chart of electronic stethoscope according to a second embodiment of the present invention.
The specific embodiment
The objective of the invention is to realize a kind of electronic stethoscope that can monitor the sound of the multiple frequency that multiple internal organs such as hear sounds, borborygmus, lungs sound, fetal heart sound send.And in electronic stethoscope, normally utilize the audio collection microphone to gather acoustical signal that internal organs send and convert the acoustical signal of gathering into the signal of telecommunication.Therefore, in order to realize the object of the invention, need to integrate the acoustical signal that different organs is sent, and then the acoustical signal after will integrating is sent to the audio collection microphone through the radiating different frequency of body surface.The integration mode depends on the acoustical coupling mode between audio collection microphone and the body surface.
The acoustical coupling mode can be divided into direct coupling system and INDIRECT COUPLING mode.Direct coupling system is meant the mode that the rigidity receiving plane of audio collection microphone is directly contacted acquired signal with body surface; The shortcoming of this mode is the vibration of restriction skin surface; Weaken the radiant intensity of acoustical signal, the acoustical signal that the grating that is produced when simultaneously the audio collection microphone contacts with body surface will interference acquisition.The INDIRECT COUPLING mode is meant that the rigidity receiving plane of audio collection microphone does not directly contact the mode of acquired signal with body surface, can be through Air Coupling and couplant coupling.These two kinds of coupled modes be respectively with air and couplant as transmitting medium, the sound through after the body surface radiation that internal organs are sent is sent to the audio collection microphone.In the present invention, for improving the accuracy that acoustical signal is gathered, adopt the Air Coupling mode.
Technical conceive of the present invention is to utilize the resonator cavity principle to realize the object of the invention.Specifically; Design the cavity of a cylindricality benzvalene form or square or cuboid or shape such as tubaeform, the audio collection microphone is implanted in the cavity, cavity is sealed with responant diaphragm; Perhaps, audio collection microphone and responant diaphragm relatively are connected the bottom of cavity.When gathering acoustical signal, responant diaphragm is contacted with body surface.When sound that internal organs such as hear sounds, lungs sound, borborygmus, fetal heart sound send radiates back promotion intracavity air column through body surface; Make its air column produce the continuous checker that expands and compress; Thereby generation resonance, the resonant acoustic signal is gathered by the audio collection microphone.The friction signal that this mode produced in the time of can reducing responant diaphragm and contact with body surface improves signal to noise ratio.
Below, will present invention is described with reference to accompanying drawing and embodiment.
(first embodiment)
Fig. 1 is the structure chart according to the electronic stethoscope of the first embodiment of the present invention.As shown in Figure 1, this electronic stethoscope comprises auscultation head, main system and speaker.Wherein, the auscultation head is used for when auscultation, contacting with body surface, and what make that internal organs send produces resonance through the radiating acoustical signal of body surface, and is the signal of telecommunication with the resonant acoustic conversion of signals.Main frame is used for amplifying and Filtering Processing through an auscultation electrical signal converted, and the electrical signal conversion after will handling is an acoustical signal.Speaker is used to play the acoustical signal through the main frame conversion.
The auscultation head further comprises resonator cavity housing 1, responant diaphragm (in Fig. 2 a, being shown 10) and audio collection microphone 2.Wherein, the acoustical signal that resonator cavity housing 1 is used to internal organs are sent produces resonance, to obtain the resonant acoustic signal.Responant diaphragm 10 is used for sealed cavity housing 1; And when auscultation, contact with body surface; The air column of acoustical signal in body surface radiates pusher dynamic resonance cavity shell 1 that internal organs are sent makes air column produce the continuous checker effect of expanding and compressing, thereby produces resonance.Audio collection microphone 2 is used to gather the resonant acoustic signal that obtains through resonator cavity housing 1, and is the signal of telecommunication with this resonant acoustic conversion of signals.
Main frame further comprises control circuit 3 and power pack 5.Wherein, control circuit 3 is used for amplifying and Filtering Processing through audio collection microphone 2 electrical signal converted, and the electrical signal conversion after will handling is an acoustical signal.Power pack 5 is used to audio collection microphone 2 and with control circuit 3 power supply is provided.Control circuit 3 further comprises pre-amplification circuit 31, filter circuit 32 and power amplification circuit 33 again, and wherein, pre-amplification circuit 31 is used for amplifying through audio collection microphone 2 electrical signal converted; Filter circuit 32 is used for the signal of telecommunication that amplifies is carried out filtering; It is acoustical signal that power amplification circuit 33 is used for the electrical signal conversion through filtering.Speaker 4 will import people's ear into through the acoustical signal of power amplification circuit 33 conversions.
Below, will each ingredient of electronic stethoscope of the present invention be described.
(1) audio collection microphone
In the present invention; The preferred electret capcitor microphone of audio collection microphone; Select for use this microphone be because: (1) its frequency response (20Hz-20KHz) and impedance are suitable for monitoring the sound that multiple internal organs send; Specifically, because the frequency of the hear sounds that can hear, lungs sound, borborygmus, fetal heart sound etc. all in 0-1500HZ, belongs to the low frequency stage of audiorange; And the frequency response range of electret capacitor type audio collection microphone is much larger than the frequency range of the hear sounds of human body, lungs sound, borborygmus, fetal heart sound etc., so can monitor the sound of multiple frequencies such as lungs sound, borborygmus, fetal heart sound; (2) noise inhibiting ability is strong.
Certainly, the present invention also can adopt the audio collection microphone of other type, for example piezoelectric ceramic wafer.
(2) resonator cavity housing
Resonator cavity principle of the present invention is following: when source of sound (promptly; From internal organs send through body surface radiating sound) excitation radiate the back through body surface and promote the intravital air column of coupled cavity that limits resonator cavity housing 1; Make its air column produce the continuous checker that expands and compress, thereby produce resonance (resonance).
In the present invention, when in resonator cavity housing 1, producing resonance, obtain plane wave in the cavity in resonator cavity housing 1.Below, suppose that resonator cavity housing 1 is cylindrical tube, the size design of the coupling cavity in the resonator cavity housing 1 is described.
According to cylindricality acoustic waveguide tube communication theory, under cylindrical coordinates, try to achieve the normal frequency of coupling cavity by wave equation:
Wherein, c
0Be the velocity of sound, get 340m/s; A is coupling cavity radius; k
MnBe a root coefficient, depend on the value of mn, (m, n) the how many times normal mode in the expression cylindrical waveguide for example, is worked as m=0, then representes (0,0) the secondary flat ripple along straightline propagation during n=0, can obtain m, the value of n through table look-up (for example, following table 1).
Table 1
| k mna | m＝0 | m＝1 | m＝2 |
| n＝0 | 0 | 1.841 | 3.054 |
| n＝1 | 3.832 | 5.322 | 6.705 |
Consider heart source and the unsymmetry of breathing source of sound, in the coupling cavity, obtain plane wave, we can confirm that the cut-off frequency of acoustic waveguide tube coupling cavity in the cylindrical tube is:
Only make f
cGreater than the upper limit of the operating frequency (measuring frequency) of sound source, can make the coupling cavity obtain plane wave, combine (2) formula to draw to be coupled the radius of cavity:
a≤0.29λ
c (3)
Wherein, λ
cWavelength for cut-off frequency.
When confirming the length of cavity, guarantee the intravital acoustic pressure uniformity in chamber, will make according to the sound field theory that acoustic pressure evenly must meet the following conditions in the cavity:
L/λ
c＜＜1 (4)
Wherein, L is the length of air column, selectes L/ λ according to different accuracies of measurement in the actual tests
cValue, here as long as satisfy (5) formula, basically just can to satisfy the intravital acoustic pressure of coupled cavity in the measuring frequency scope that will require even.
The upper limiting frequency of considering hear sounds and borborygmus is no more than 2KHz, so when the cut-off frequency of coupling cavity is set, draw the be coupled radius of cavity and the length of air column according to own needs for people's formula (3) and formula (5).
Certainly when actual design,, also need assist certain experiment to screen for the design of the length of the radius of coupling cavity and air column because coupling material that cavity adopted is different.In addition, when resonator cavity housing 1 is other shape except that cylindrical tube, can obtains the size design of the coupling cavity of resonator cavity housing 1 qualification with reference to above computational methods and through experiment, and then obtain the size design of resonator cavity housing 1.
The material of resonator cavity housing 1 can be selected nonmetallic materials and metal material, preferred plastics or steel material, and the reason of preferred plastic material is to be shaped simply, the reason of preferred metal materials is because the metal frequency characteristic is relatively good.
Shown in Fig. 2 a, resonator cavity housing 17 is a cylindricality benzvalene form resonator cavity housing, and audio collection microphone 18 is contained in the cylindricality benzvalene form resonator cavity housing 17.Responant diaphragm 10 seals resonator cavity housing 17 and audio collection microphone 18; To play the effect of sealing; And when auscultation, contact with body surface; The air column of the coupling cavity that the acoustical signal that internal organs are sent promotes to be limited resonator cavity housing 1 after body surface radiates produces air column to expand and the continuous checker effect of compression, thereby produces resonance.
Shown in Fig. 2 b, resonator cavity housing 19 is tubaeform resonator cavity housing, and audio collection microphone 20 is contained in the tubaeform resonator cavity housing 19.
Shown in Fig. 2 c, the auscultation head is divided into cylindrical, comprising the resonator cavity housing 14 and the audio collection microphone 15 that is connected to resonator cavity 14 bottoms of cylindricality benzvalene form, and the resonator cavity housing 14 outer responant diaphragms 13 that are provided with.
Preferably, be useful on sound damping internal layer shell 12 at resonator cavity housing 14 overcoats, internal layer shell 12 is with responant diaphragm 13 sealed cavity housings 14 and audio collection microphone 15.
Preferably, make the audio collection microphone 15 of 12 li of internal layer shells be in suspended state (that is, making audio collection microphone 15 not contact firmly), can effectively shield outside noise like this, reduce vibration with internal layer shell 12.For example, can in internal layer shell 12, be provided with the sound-absorbing material 21 and pressing plate 22 that are used to wrap up audio collection microphone 15, pressing plate 22 is used for audio collection microphone 15 and sound-absorbing material 21 are fixed between the bottom and internal layer shell 12 of resonator cavity housing 14.Make that like this audio collection microphone 15 that is in internal layer shell 12 the insides is in the state of suspension, thereby further strengthen the effect of shielding outside noise, minimizing vibration.In addition, attractive material 21 can play the effect of vibration damping.Here point out; In pressing plate shown in Fig. 2 c 22 and sound-absorbing material 21, there is a through hole that is connected to audio collection microphone 15; This hole is used to settle the connecting line of audio collection microphone 15, so that it is connected with other circuit part (comprising power pack 5 and pre-amplification circuit 31).
Preferably; Also be provided with an outer casing 11 outside the internal layer shell 12 in addition; Between internal layer shell 12 and outer casing 11, be noise reduction layer 16; Noise reduction layer 16 can be sealed hollow, also can be for carrying out the closed chamber of application of vacuum or inert gas injecting, to play the effect of isolation environment noise once more.Here point out; In outer casing 11 shown in Fig. 2 c, exist one with pressing plate 22 in the corresponding through hole of through hole; This hole also is the connecting line that is used to settle audio collection microphone 15, so that it is connected with other circuit part (comprising power pack 5 and pre-amplification circuit 31).
Preferably; Between internal layer shell 12 and outer casing 11, also be provided with elastic connection structure; To utilize internal layer shell 12 to be connected to make internal layer shell 12 whole (the resonator cavity housing 14, audio collection microphone 15, the responant diaphragm 13 that comprise 12 li of internal layer shells 12, internal layer shell) to be in suspended state (promptly with elasticity between the outer casing 11; Audio collection microphone 15 is soft the contact with internal layer shell 12 outsides, does not contact with hard materials such as metal like outer casing 11).The same, can further shield outside noise like this, reduce vibration.
For example, said elastic connection structure can comprise connecting ring and the support column that is used for elasticity connection internal layer shell 12 and outer casing 11.Shown in Fig. 2 d, set up connecting ring 23 and support column 24 in the junction of internal layer shell 12 and outer casing 11, described connecting ring 23 is annular flexible glue connection gasket; Described support column 24 is located between pressing plate 22 and the outer casing 11, and connecting ring 23 makes the whole parts of internal layer shell 12 be among the suspended state with support column 24.When internal layer shell 12 integral body are in suspended state, owing to connecting ring 23 and support column 24 are processed for soft material, thus the effect that also can further strengthen shielding outside noise, reduce vibration.Here point out; Connecting ring 23 is near internal layer shell 12 and outer casing 11 1 sides; Responant diaphragm 13 is attached to the outer surface of outer casing 11, that is to say, responant diaphragm 13 is that remaining whole parts shown in Fig. 2 d (comprising connecting ring 23, support column 24) are all sealed.
Preferably, connecting ring 23 can adopt rubber, silica gel, PU material etc.
Preferably, support column 24 can adopt rubber, silica gel, its role is to reduce vibration, reduces noise and location.
Preferably, can add that also acoustical cotton is as shielding outside noise, vibration damping deadener in the outside of resonator cavity housing.
In addition; Also can be through reflection of the interlayer filler (for example, foam) between outer casing and the ectonexine and absorbing environmental noise, because endothecium structure is a suspended state; So the external environment condition noise through above measure after, can't be transmitted in the audio collection microphone 15.
In sum; Be in suspended state and be in suspended state like the described audio collection microphone 15 of Fig. 2 c like the described whole internal layer shell 12 of Fig. 2 d; Described suspended state is meant that described audio collection microphone 15 is soft the contact with internal layer shell 12 outsides; Be not connected, thereby can play shielding outside noise and the effect that reduces vibration with hard materials such as metal like outer casing 11.
Wherein, advantage was that signal amplitude is big during Fig. 2 a and Fig. 2 b gave an example, and shortcoming is that noise is the strongest.Fig. 2 c is in suspended state owing to the audio collection microphone, and is the ectonexine housing, has further reduced noise, and capacity of resisting disturbance is strong; Fig. 2 d is the further optimization of Fig. 2 c, and capacity of resisting disturbance is stronger.
(3) pre-amplification circuit
The effect of pre-amplification circuit is to amplify through audio collection microphone electrical signal converted.Can adopt the operational amplification circuit of known ability amplification signal to realize pre-amplification circuit of the present invention; For example; The operational amplification circuit that provides on 332 pages of " Fundamentals of Electronic Technology analog part " (the 4th edition) (Higher Education Publishing House, Kang Huaguang chief editor) chapter 8.
(4) filter circuit
The effect of filter circuit is that the signal of telecommunication that amplifies is carried out filtering.Can adopt known high pass or low-pass filter circuit to realize filter circuit of the present invention, for example, the filter circuit that provides on 108 pages of " electronic circuitry design experiment test " second editions of the Xie Zimei of publishing house of HUST chief editor.
(5) power amplification circuit
The effect of power amplification circuit is with being acoustical signal through the electrical signal conversion of filtering.Can adopt known can be that the power amplification circuit of acoustical signal is realized power amplification circuit of the present invention with electrical signal conversion, for example, and the LM386 application circuit.
(6) power pack
The effect of power pack is for all modules (comprising audio collection microphone, pre-amplification circuit, filter circuit and power amplification circuit) power supply to be provided.Can realize according to different power management chip application circuits, for example, utilize TPS60400 to come to be module for power supply such as operational amplification circuit.
Can find out that from above description the principle that the present invention utilizes resonator cavity is integrated the sound of the various frequencies that various internal organs send, thereby realize the monitoring of multiple sound, therefore, can be applicable to the diagnosis of multiple disease.And electronic stethoscope of the present invention simple in structure, easy to use is convenient to the doctor and used separately, the suitable popularization.
(second embodiment)
Present embodiment has increased the function of digital assay on the basis of first embodiment,, realize the record of various sound in the body and the operations such as demonstration of sound relevant information that is.
Fig. 3 is the structure chart of electronic stethoscope according to a second embodiment of the present invention.Can know with Fig. 1 that through comparison diagram 3 electronic stethoscope of present embodiment also comprises digital signal circuit 6 and display screen 7, wherein, it is digital signal that digital signal circuit 6 is used for the electrical signal conversion through filter circuit 32 filtering; Display screen 7 is used to show the digital signal through digital signal circuit 6 conversions.Here, can adopt known can be that the scm software of digital signal is handled with analog signal conversion, then through converting the digital signal of conversion to can drive counting pulse signal after the comparator effect, thereby realizes that information of the present invention shows.For example, can referring to the People's Telecon Publishing House publish by the circuit that provides on 233 pages of " utility unit circuit and application thereof " chapter 10 of Huang Jichang chief editor.
Below with reference to accompanying drawing and embodiment the present invention is described in detail; But; Should be appreciated that the present invention is not limited to above disclosed specific embodiment, any modification based on the disclosed technical scheme of this description all should be included in protection scope of the present invention.
Claims (18)
1. electronic stethoscope comprises:
The auscultation head, it is used for when auscultation, contacting with body surface, and what make that internal organs send produces resonance through the radiating acoustical signal of body surface, and is the signal of telecommunication with the resonant acoustic conversion of signals;
Main frame, it is used for amplifying and Filtering Processing through an auscultation electrical signal converted, and the electrical signal conversion after will handling is an acoustical signal;
Speaker, it is used to play the acoustical signal through the main frame conversion.
2. electronic stethoscope according to claim 1 is characterized in that, said auscultation head comprises:
The resonator cavity housing, its acoustical signal that is used to internal organs are sent produces resonance, to obtain the resonant acoustic signal;
Responant diaphragm; It is used for the sealed cavity housing, and when auscultation, contacts with body surface, the air column of acoustical signal in body surface radiates pusher dynamic resonance cavity shell that internal organs are sent; Make air column produce the continuous checker effect of expanding and compressing, thereby produce resonance;
The audio collection microphone, it is used to gather the resonant acoustic signal that obtains through the resonator cavity housing, and is the signal of telecommunication with this resonant acoustic conversion of signals.
3. electronic stethoscope according to claim 2 is characterized in that, said audio collection microphone is contained in the resonator cavity housing.
4. electronic stethoscope according to claim 2 is characterized in that, said audio collection microphone and responant diaphragm relatively are connected the bottom of resonator cavity housing.
5. electronic stethoscope according to claim 4 is characterized in that, said resonator cavity housing overcoat is useful on sound damping internal layer shell, and said internal layer shell is with responant diaphragm sealed cavity housing and audio collection microphone.
6. electronic stethoscope according to claim 5 is characterized in that, the audio collection microphone in the said internal layer shell is in suspended state.
7. electronic stethoscope according to claim 6; It is characterized in that, also be provided with in the said internal layer shell and be used to wrap up the sound-absorbing material of audio collection microphone and be used for audio collection microphone and sound-absorbing material are fixed on the pressing plate between resonator cavity housing bottom and the internal layer shell.
8. electronic stethoscope according to claim 5 is characterized in that said internal layer shell is provided with outer casing outward, is that sealed hollow is perhaps for carrying out the closed chamber of application of vacuum or inert gas injecting between said internal layer shell and the outer casing.
9. electronic stethoscope according to claim 8; It is characterized in that; Between said internal layer shell and outer casing, also be provided with elastic connection structure, the resonator cavity housing, the whole suspended state that is in of the harmonious vibrating diaphragm of audio collection microphone that make internal layer shell and the inside thereof to utilize internal layer shell to be connected with elasticity between the outer casing.
10. electronic stethoscope according to claim 9 is characterized in that, said elastic connection structure comprises connecting ring and the support column that is used for elasticity connection internal layer shell and outer casing.
11. electronic stethoscope according to claim 10 is characterized in that, said connecting ring adopts rubber or silica gel or PU material, and said support column adopts rubber or silica gel.
12. electronic stethoscope according to claim 2 is characterized in that, said resonator cavity outside is provided with sound-absorbing material.
13. electronic stethoscope according to claim 2 is characterized in that, said audio collection microphone is an electret capacitor type audio collection microphone.
14. electronic stethoscope according to claim 2 is characterized in that, said resonator cavity housing is formed by metal material or nonmetallic materials.
15. electronic stethoscope according to claim 2 is characterized in that, said resonator cavity housing is in following: cylindricality benzvalene form resonator cavity housing, square or cuboid resonator cavity housing, tubaeform resonator cavity housing.
16. electronic stethoscope according to claim 2 is characterized in that, said main frame comprises:
Control circuit, it is used for amplifying and Filtering Processing through audio collection microphone electrical signal converted, and the electrical signal conversion after will handling is an acoustical signal;
Power pack, it is used to the audio collection microphone and control circuit provides power supply.
17. electronic stethoscope according to claim 16 is characterized in that, said control circuit comprises:
Pre-amplification circuit, it is used for amplifying through audio collection microphone electrical signal converted;
Filter circuit, it is used for the signal of telecommunication that amplifies is carried out filtering;
Power amplification circuit, it is used for the electrical signal conversion through filtering is acoustical signal.
18. electronic stethoscope according to claim 17 is characterized in that, said control circuit also comprises:
Digital signal circuit, it is used for said electrical signal conversion through filtering is digital signal; With
Display screen, it is used to show the digital signal through the digital signal circuit conversion.
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| CN201110121758.7A CN102772222B (en) | 2011-05-10 | 2011-05-10 | Electronic stethoscope |
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| CN201110121758.7A CN102772222B (en) | 2011-05-10 | 2011-05-10 | Electronic stethoscope |
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