CN208864314U - A kind of passive type fetal rhythm monitoring assembly and equipment - Google Patents
A kind of passive type fetal rhythm monitoring assembly and equipment Download PDFInfo
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- CN208864314U CN208864314U CN201820771669.4U CN201820771669U CN208864314U CN 208864314 U CN208864314 U CN 208864314U CN 201820771669 U CN201820771669 U CN 201820771669U CN 208864314 U CN208864314 U CN 208864314U
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Abstract
The utility model discloses a kind of passive type fetal rhythm monitoring assembly and equipment, wherein component includes soft diaphragm, first resonance cavity shell, elastic vibrating diaphragm, second resonance cavity shell, coil, magnet and metallic briquette, wherein, the soft diaphragm and the first resonant cavity housing bottom are tightly connected, the elasticity vibrating diaphragm and the first resonant cavity case top are tightly connected, form the first resonant cavity, the second resonance cavity shell is tightly fastened on elastic vibrating diaphragm, form the second resonant cavity, the coil is fixed on the elastic vibrating diaphragm, the magnet is inserted into the coil, and the coil and the magnet are respectively positioned in second resonant cavity, the metallic briquette covers on the second resonant cavity hull outside.Fetal heart rate signal can effectively be picked up in the case where not external emitted energy and be converted to electric signal by the component.Equipment carries out subsequent processing, including analog signal processing and digital signal processing to the electric signal of pickup, forms stable Fetal Heart Rate detection output.It can be realized the long-time passive type monitoring of Fetal Heart Rate by designing this equipment above.
Description
Technical field
The present invention relates to fetal rhythm monitoring technology more particularly to a kind of passive type fetal rhythm monitoring assembly and equipment.
Background technique
Fetal Heart Rate is adjusted by sympathetic nerve and parasympathetic nerve, and fetal heart monitoring is to trace the Fetal Heart Rate of moment by signal to become
Change the curve for being formed by monitoring figure, when understanding movement of the foetus, when uterine contraction fetal rhythm reaction, with speculate intrauterine fetal whether there is or not anoxic and
Health status.The regular contraction in uterine contraction, that is, uterus is the important monitoring index that clinically pregnant woman produces inspection.It encloses the raw phase and divides
Fetus is guarded during childbirth, guardianship content includes three Fetal Heart Rate, movement of the foetus and uterine contraction important indicators.Uterine contraction can cause
Fetal Heart Rate is accelerated or is slowed down, and the situation quality of uterine contraction can directly affect the activity and childbirth of fetal rhythm, and the uterine contraction of pregnant early stage is even more to flow
The important sign produced.It is accordingly used in the fetal rhythm monitoring device for the treatment of purpose, it is necessary to have synchro measure Fetal Heart Rate, movement of the foetus and uterine contraction
Function is indispensable.
Due to being protected when fetus is in parent by parent, medical instrument can not directly contact fetus, therefore in pregnancy
Middle fetal rhythm situation and movement of the foetus situation are that doctor judges the whether normal most important index of fetus.Generally since 18-20 weeks, fetus
Heart development, so that it may hear fetal heart sound.The normal range (NR) of fetal heartbeat is between 120bpm to 160bpm, more than 160bpm or
It is likely to less than 120bpm problematic, while also having movement of the foetus when fetus regains consciousness, it is existing to have acceleration for Fetal Heart Rate during movement of the foetus
As.If Heart rate decelerations can occur for fetal abnormality, slowing down is more than that certain time or number indicate that fetus may be dangerous.Pregnant woman
It is average to arrive the inspection that hospital carries out fetal rhythm movement of the foetus once a month during pregnant 12~32 weeks.But since gap periods are longer, big portion
Fetal abnormality is divided not to occur during pregnant woman hospital checks, such as fetal distress caused by a variety of causes, when often finding
Have little time to take relevant treatment measure.According to statistics, the considerable children mental retardation of China precisely due to pregnancy period anoxic and not and
When handle caused by caused by nervous system development exception.Therefore there is an urgent need to can carry out fetal heart monitoring at any time by doctor and pregnant woman
Equipment.This can be effectively reduced fetal mortality and reduces pregnant woman's complication, it is ensured that prenatal and postnatal care.
Traditional fetal rhythm monitoring class product is all active acquisition data, that is, uses doppler transducer, this probe can be to tire
Youngster issues energy wave, and energy wave can rebound letter in reply number after encountering fetus, and the data of fetus are exactly detected by these signals.It is more
General Le equipment can obtain corresponding data due to needing persistently to play fetus high-frequency ultrasonic, and report for a long time according to the U.S.
Ultrasonic wave contact may cause tissue vacuole, and then generate adverse effect.Therefore U.S. FDA clear stipulaties medical supersonic Doppler
Product persistently uses the time no more than 20 minutes, does not exceed daily twice and it is necessary to use under physician guidance.It is some
The domestic ultrasound doppler equipment for not obtaining Medical Instruments certification is more dangerous, and transmission power is possible to exceeded to generate more
Big harm.
For movement of the foetus, even traditional medical supersonic Doppler Monitoring equipment, abdominal pressure and Fetal Heart Rate are carried out
Be independent measurement, there is no intellectual analysis ability, also just can not automatization judgement whether there is movement of the foetus, therefore most of instrument is all
Movement of the foetus cannot be detected, pregnant woman oneself is needed to carry out artificial counting.
Also occurs part number formula stethoscope in the market, fetal heart sound can be heard by being known as.Actual conditions be fetal heart sound very
Faint, her abdominal and external environment have various interference signals, such as parent heartbeat, gurgling sound, breath sound, blood flow sound.
What on the one hand these digital stethoscope class products used is all small-sized Electret condenser microphone or MEMS micro-electro-mechanical microphone, diaphragm
Area is smaller, therefore frequency response low-frequency cut-off frequency is higher, decays for ultra-low frequency signal as fetal heart sound very big；It is another
For aspect in order to pick up the audio-frequency informations of internal a variety of organs, the general upper limit of the frequency range of these digital stethoscopes reaches several
Hundred hertz, cause when listening fetal rhythm noise interference big, can not carry out it is effectively stable continue to monitor, be not used to medical mesh substantially
's.
Summary of the invention
Goal of the invention: in view of the problems of the existing technology the present invention, provides a kind of passive type fetal rhythm monitoring assembly and sets
It is standby, fetal heart sound can be precisely efficiently identified out in the case where not external emitted energy, and calculate Fetal Heart Rate, movement of the foetus in real time
And uterine contraction.
Technical solution: passive type fetal rhythm monitoring assembly of the present invention, including soft diaphragm, the first resonance cavity shell,
Elastic vibrating diaphragm, the second resonance cavity shell, coil, magnet and metallic briquette, wherein the soft diaphragm and the first resonance cavity shell
Sealed bottom connection, the elasticity vibrating diaphragm and the first resonant cavity case top are tightly connected, and form the first resonant cavity, described
Second resonance cavity shell is fixed on the elastic vibrating diaphragm, forms the second resonant cavity, and the coil is fixed on the elastic vibrating diaphragm
On, the magnet is inserted into the coil, and the coil and the magnet are respectively positioned in second resonant cavity, the metal
Briquetting covers on the second resonant cavity hull outside, and weight is 70-80 grams or so.
Further, the soft diaphragm guarantees vibration good communication to dimpling on the outside of first resonant cavity.
Further, the range of the area ratio of the area of the soft diaphragm and the elastic vibrating diaphragm are as follows: 20:1~30:
1。
Further, first resonant cavity and fetal rhythm audio form resonance.
Further, through-hole is provided on the side wall of the first resonance cavity shell.
Further, interlayer is contained in the side wall of the first resonance cavity shell, is filled with sound-absorbing material in interlayer.
Further, the coil windings number is 500 circles.
Further, the resonance response frequency range of the elastic vibrating diaphragm is 30Hz-100Hz.
Passive type fetal rhythm monitoring device of the present invention includes above-mentioned component and preamplifier, trapper, band
From gain amplifier and MCU processor, the input terminal of the preamplifier connects the coil, output end by bandpass filter, AGC
The trapper is connected, the trapper, bandpass filter, AGC are sequentially connected from gain amplifier and MCU processor.
Optionally, the equipment can also include pressure sensor, low-frequency amplifier and analog-digital converter, and the pressure passes
Sensor, low-frequency amplifier, analog-digital converter, MCU processor are sequentially connected.
Optionally, the equipment can also include wireless communication module and power module, the wireless communication module connection
The MCU processor, the power module are the power supply of each device.
The utility model has the advantages that compared with prior art, the present invention its remarkable advantage is:
The faint longitudinal wave that fetal heartbeat is conducted to her abdominal is acquired by using specific acquisition device, is converted
And processing, while her abdominal pressure is acquired, the present embodiment can effectively monitor fetal rhythm audio and abdominal pressure index, in equipment
End or server-side handle acquisition data, and operation obtains the indexs such as Fetal Heart Rate, movement of the foetus and uterine contraction, more, by the index
Curve carries out intelligence and studies and judges and then determine pregnant woman and foetus health state and carry out related guidance, alarm or sharing.This method is not
Actively emit any energy, any health effect do not caused for fetus and pregnant woman so that be in it is autonomous carry out fetal rhythm monitoring and
Long term monitoring is possibly realized.The present invention can effectively promote the correctness of passive type fetal rhythm data acquisition, and realize automatic tire
It is dynamic to count.
Detailed description of the invention
Fig. 1 is the block diagram of one embodiment of passive type fetal rhythm monitoring assembly provided by the invention；
Fig. 2 is the block diagram of one embodiment of passive type fetal rhythm monitoring device provided by the invention；
Fig. 3 is the course of work schematic diagram of fetal rhythm monitoring device in Fig. 2；
Fig. 4 is the block diagram of another embodiment of passive type fetal rhythm monitoring device provided by the invention.
Specific embodiment
Embodiment 1
Present embodiment discloses a kind of passive type fetal rhythm monitoring assemblies, as shown in Figure 1, including that soft diaphragm 101, first is humorous
Shake cavity shell 102, elastic vibrating diaphragm 103, the second resonance cavity shell 104, coil 105, magnet 106 and metallic briquette 107, wherein
Soft diaphragm 101 is connect with 102 sealed bottom of the first resonance cavity shell, 102 top of elastic vibrating diaphragm 103 and the first resonance cavity shell
It is tightly connected, forms the first resonant cavity 108, the second resonance cavity shell 104 is fixed on elastic vibrating diaphragm 103, forms the second resonance
Chamber 109, coil 105 are fixed on elastic vibrating diaphragm 103, and magnet 106 is inserted into coil 105, and coil 105 and the equal position of magnet 106
In in the second resonant cavity 109, metallic briquette 107 is covered on outside the second resonance cavity shell 104.It is situated between in detail to each device below
It continues.
Soft diaphragm 101 is contacted with skin of pregnant women, and the fetal heart sound low frequency longitudinal wave for will experience is conducted to the first resonance
In chamber 108.Since soft diaphragm 101 needs directly to contact with skin of pregnant women, the material used is medicine without allergy material,
Such as silica gel.To guarantee to contact with the good of skin, which has biggish tensile property, to guarantee well to connect with parent
Touching, elastic property and parent skin are close, and to the pico- protrusion in 108 outside (i.e. her abdominal side) of the first resonant cavity, guarantee to tie up
Be scheduled on after her abdominal can comprehensive engagement skin, her abdominal skin vibrations can be fully transmitted to the first resonant cavity.
First resonance cavity shell, 102 bottom cross section is greater than top cross-sectional area, i.e., low wide and up narrow, top is plane
Taper is provided with through-hole 110 on side wall, the through-hole 110 and outside atmosphere connection, and effect is to offset high frequency noise interference, aperture
Diameter is 0.5mm or so.The side wall of first resonance cavity shell 102 has higher resonance frequency, while can be added in interlayer
Sound-absorbing material is to reduce external noise influence.The first resonant cavity 108 in first resonance cavity shell 102 can be with fetal heart sound low frequency
Resonance occurs for longitudinal wave, and resonance frequency can also amplify fetal heart sound longitudinal wave, concrete principle in 70Hz or so are as follows: humorous by first
The area of the soft diaphragm 101 of vibration 108 bottom of chamber is set as the area much larger than the elastic vibrating diaphragm 103 at the top of it, area ratio
Range are as follows: 20:1~30:1.According to air pressure Transfer Formula, the distance of the soft up and down motion of diaphragm 101: elastic vibrating diaphragm 103 is displaced
Distance=103 area of elastic vibrating diaphragm: soft 101 area of diaphragm.Therefore the design can play preferably fetal heart sound low frequency longitudinal wave
Amplification effect.
Elastic vibrating diaphragm 103 carries out resonance, low-frequency vibration better performances when can vibrate in the first resonant cavity 108
And it is insensitive to high-frequency vibration, specially have preferable resonance response to the section 30Hz-100Hz.Optionally, the diaphragm materials
May include and be not limited to organic material, rubber or papery vibrating diaphragm etc..
Resonance occurs for the second resonant cavity 109 and the first resonant cavity 108, and due to small volume, resonance frequency is higher than 1K
Hz can effectively offset the parent audio disturbances signal of the first resonant cavity 108 introducing.
105 one end of coil is fixed on elastic vibrating diaphragm 103, and the other end is hanging.In the vibration of elastic vibrating diaphragm 103, coil 105
It is followed to move up and down, frequency is identical as pressure longitudinal wave, and due to being internally provided with magnet 106, coil 105 can produce sense when moving
Answer voltage.Wherein, 105 winding 500 of coil encloses.Magnet 106 is specially iron permanent magnet, or other magnets are fixed on the
The upper top surface of two resonant cavities, 104 shell, central axes are overlapped with 105 central axes of coil, and are not contacted with coil 105.Magnet 106
The signal strength of the bigger generation of magnetic flux is higher, therefore the magnet 106 selects high magnetic product to ensure signal quality.
For metallic briquette 107 comprehensively around the second resonant cavity 109, the external audio for capableing of the transmitting introducing of shielding environment sound is dry
It disturbs.Additionally, due to for metal product, therefore have good shield effectiveness for the electromagnetic interference of environment, it being capable of effective increase line
The signal-to-noise ratio of the 105 faint small signal of output of circle.80 grams of stainless steel die cast product, optionally, the metal are used in the present embodiment
Briquetting can also adopt the production such as other metals such as copper, iron, aluminium.
Embodiment 2
A kind of passive type fetal rhythm monitoring device is present embodiments provided, as shown in Fig. 2, including the component in embodiment 1
201 and preamplifier 202, trapper 203, bandpass filter 204, AGC from gain amplifier 205, MCU processor
206, pressure sensor 207, low-frequency amplifier 208, analog-digital converter 209 and power module 211, preamplifier 202 it is defeated
Enter the coil 105 in end connection example 1 group part 201, output end connects trapper 203, trapper 203, bandpass filter
204, AGC is sequentially connected from gain amplifier 205, MCU processor 206, pressure sensor 207, low-frequency amplifier 208, modulus
Converter 209, MCU processor 206 are sequentially connected, and the top inside fetal rhythm monitoring device is arranged in pressure sensor, for adopting
Collect pregnant woman palace bottom pressure delta data.In addition, in order to preferably monitor, show, store and process information, equipment further includes wireless
Communication module 210, and mobile terminal/cloud 212 is set, wireless communication module 210 connects MCU processor, mobile terminal/cloud 212
Module 210 and MCU processor 206 transmit data by wireless communication, for later period intellectual analysis, display, or pass through social activity
Network or other tools share data with hospital, doctor or third party.Power module 211 is preferably battery power supply mould
Block, to facilitate the body-worn equipment, power module 211 reduces power consumption to down circuitry when not measuring.
The course of work of this equipment are as follows:
Step S301- secures the equipment in her abdominal.To guarantee fetal rhythm measurement effect, fetal rhythm monitoring device needs as far as possible
Close to heart of fetus position, since fetus position and is not fixed in parent, it is therefore desirable to using this equipment multiple positions into
The exploratory test of row, when monitoring device report can stability monitoring fetal rhythm rate score when, complete equipment in abdomen using bandage etc.
Fixation.
Step S302- is conducted abdomen low frequency longitudinal wave to the first resonant cavity 108, soft diaphragm bottom by soft diaphragm
For to pregnant woman side dimpling shape, and there is preferable elasticity, edge is close to the first resonance cavity shell 102, suitably ties up when having
When band pressure is added on fetal rhythm monitoring device, soft diaphragm and her abdominal skin form good sealing.
The first resonant cavity of step S303- 108 amplifies fetal heart sound longitudinal wave, filters noise.First resonant cavity, 108 sound chamber passes through
Design, has preferable resonance-characteristic to 30-100Hz low frequency, while to can be effectively reduced high-frequency noise dry for through-hole 110 in sound cavity wall
It disturbs.Fetal rhythm conduct vibrations are to her abdominal skin, the longitudinal wave that skin of abdomen can be caused slightly to rise and fall up and down.Soft diaphragm 101 by
It is close in skin of pregnant women, the vibration of skin can cause the movement of soft diaphragm 101, and then be transmitted in the first resonant cavity 108
Air, formed in resonant cavity and propagated by the audio of medium of air.
Step S304- air pressure change pushes elastic vibrating diaphragm, drives coil movement.Elastic vibrating diaphragm and the second resonant cavity shell are tight
Close combination, the displacement generated due to elastic vibrating diaphragm and the inverse that soft diaphragm vibration amplitude proportional is the two area ratio,
Audio frequency vibration can be amplified by the design.
Step S305- coil and magnet relative motion form voltage.Coil terminals draw from elastic 103 junction of vibrating diaphragm
Out；Since mass of coil is smaller, the movement of elastic vibrating diaphragm 103 is had substantially no effect on, coil and magnet relative motion generate induced electricity
Pressure, and drawn by the terminal at both ends, form electric signal.
The amplification of step S306- preamplifier signal.Since the voltage fluctuation that coil generates is very faint, only 5-10 milli
Grade is lied prostrate, therefore is easy to be flooded by air interference, needs to carry out preposition amplification, the times magnification of the part before subsequent processing first
Number is 300 times, and preferably, preamplifier, which is placed in shielding box, prevents external noise from interfering.
The wireless Hz noise of step S307- trap filters 50Hz and 60Hz.Electric signal output after due to signal amplitude compared with
To be faint, therefore it is easy the interference by noise wireless in environment.It is in alternating current transmission process that low-frequency wireless, which interferes principal element,
50Hz the or 60Hz power frequency of generation, and this frequency is overlapped with fetal rhythm audio frequency range just.Therefore pass through power frequency notch filter energy
It is enough to filter out the air interference that small signal end introduces.
Retain 30Hz-70Hz fetal heart sound after step S308- band-pass filter.Parent heartbeat vibration frequency, gurgling sound
And parent blood flow sound is usually 100Hz or more, therefore can effectively filter out additional interference by bandpass filtering.
Step S309-AGC is from gain amplifier adjust automatically amplification factor.The part is variable gain amplifier, and MCU is adopted
Sample obtains signal, calculates average power signal density and judges whether the excessive clipping phenomena of gain occur, sends amplification in real time
Multiple is to variable gain circuit.Average power density be in the past the audio samples accumulated value in 10 seconds divided by number of samples.
When the small Mr. Yu's value of average power density, MCU notifies gain circuitry to increase amplification factor；When finding clipping phenomena (waveform
The upper limit or lower limit are limited in a certain fixed value), then reduce gain circuitry amplification factor.
Step S310-MCU is converted to digital signal.Digital signal samples frequency need be twice of minimum analog frequency with
On, for 70Hz audio, the minimum 150Hz of sample frequency is needed, is to promote processing accuracy in the present embodiment, uses
300Hz sampling, i.e., every 3.3 milliseconds of samplings are primary.
Step S311- digital filter filter high-frequency interference signal.Sampled data passes through smoothing processing in the present embodiment, such as
Fruit Bn>(Bn-2+Bn-1)/2+D or Bn<(Bn-2+Bn-1)/2-D, then it is assumed that BnThere is sign mutation interference, just abandons Bn, and make
With (Bn-2+Bn-1)/2 replace Bn, then carry out data smoothing processing, An=(Bn-3+Bn-2+Bn-1+Bn)/4.The filter is combined and is adopted
Sample frequency 300Hz, the low-pass filter of actually one 0-75Hz.
Step S312-Self Correlation algorithm dynamic flow cytometer detection Fetal Heart Rate.Self Correlation is one
A general repetitive pattern detection method is no longer described in detail in specific implementation method this example.In the present embodiment, it caches in memory
1024 sampled values, and dynamic sliding window mode is used, once-through operation is carried out to data in window every 250 milliseconds, is generated
Continuous fetal heart rate curve.
The variation of step S313- Simultaneous Monitoring palace bottom abdominal pressure, is converted to electricity for abdominal pressure by pressure sensor
Signal, and synchronized by analog-digital converter and be converted to digital signal.Since pressure change comparative audio information is a variation ratio
More slow signal, therefore also need to carry out digital filtering and signal amplification after pressure sensor sampling, the present embodiment passes through
4Hz low-pass filter and low-frequency amplifier realize pressure signal amplification, filter out High-frequency Interference.
Optionally, fetal rhythm data and pressure data are transmitted to mobile terminal displaying, audio playback to step S314-.Because of 30-
70Hz fetal heart sound underfrequency, between human body sense of hearing immunity region, to promote result of broadcast, this system uses fetal heart sound pair
300Hz audio carries out amplitude-modulating modulation, forms the fetal heart sound waveform that reference frequency is 300Hz and plays by loudspeaker.
Step S315- analyzes data, identifies movement of the foetus information.Will cause when movement of the foetus abdominal pressure variation, but it is various other because
Element may also generate pressure change such as pregnant woman's position chanP, uterine contraction etc..From human mechanism, movement of the foetus can generally add with Fetal Heart Rate
Fast phenomenon, therefore the present embodiment carries out comprehensive judgement for the coupling condition of movement of the foetus and Fetal Heart Rate on timing curve, realizes certainly
Dynamic movement of the foetus identification.That is abdominal pressure variation restores more than 10% and in a few seconds, while Fetal Heart Rate occurs of short duration accelerating (to change and surpass
Cross 15bpm), that is, regard as movement of the foetus.Uterine contraction signal can be equally determined, compared to movement of the foetus duration, uterine contraction duration
Longer, if it find that pressure sensor pressure change is more than 10%, and the duration is more than 8 seconds, then regards as having occurred primary
Uterine contraction.
Optionally, related data can store step S316- in cloud, and can by intelligence study and judge technology differentiate pregnant woman and
Whether fetal state is normal, provides related guidance.The data can also be shared with related personnel by social software or tool.
Embodiment 3
Another passive type fetal rhythm monitoring device is present embodiments provided, as shown in figure 4, the present embodiment and embodiment 2
Other parts are identical, and difference is pressure sensor 207, low-frequency amplifier 208 and analog-digital converter 209 in the present embodiment
An individual module is formed, is not arranged to an entirety with main part, is separated with main part, pressure sensor 207,
The separate modular that low-frequency amplifier 208 and analog-digital converter 209 are formed can be an independent device, be also possible to setting and exist
Component on other devices exists for example, can be set in uterine contraction pressure probe as a component.The present embodiment its
His part is same as Example 2, and the course of work is also same as Example 2, other not detailed places please refer to embodiment 2, no longer
It repeats.
The above disclosure is only the preferred embodiments of the present invention, and the scope of the invention cannot be limited thereby,
Therefore equivalent changes made in accordance with the claims of the present invention, are still within the scope of the present invention.
Claims (10)
1. a kind of passive type fetal rhythm monitoring assembly, it is characterised in that: including soft diaphragm, the first resonance cavity shell, elastic vibrating diaphragm,
Second resonance cavity shell, coil, magnet and metallic briquette, wherein the soft diaphragm and the first resonant cavity housing bottom seal
Connection, the elasticity vibrating diaphragm and the first resonant cavity case top are tightly connected, and form the first resonant cavity, second resonance
Cavity shell is fixed on the elastic vibrating diaphragm, forms the second resonant cavity, and the coil is fixed on the elastic vibrating diaphragm, the magnetic
Body is inserted into the coil, and the coil and the magnet are respectively positioned in second resonant cavity, and the metallic briquette covers on
The second resonant cavity hull outside.
2. passive type fetal rhythm monitoring assembly according to claim 1, it is characterised in that: the area of the soft diaphragm and institute
State the range of the area ratio of elastic vibrating diaphragm are as follows: 20:1~30:1.
3. passive type fetal rhythm monitoring assembly according to claim 1, it is characterised in that: the soft diaphragm is to described first
Protrusion on the outside of resonant cavity.
4. passive type fetal rhythm monitoring assembly according to claim 1, it is characterised in that: first resonant cavity and fetal heart sound
Frequency forms resonance.
5. passive type fetal rhythm monitoring assembly according to claim 1, it is characterised in that: the side of the first resonance cavity shell
Through-hole is provided on wall.
6. passive type fetal rhythm monitoring assembly according to claim 1, it is characterised in that: the side of the first resonance cavity shell
Contain interlayer in wall, is filled with sound-absorbing material in interlayer.
7. passive type fetal rhythm monitoring assembly according to claim 1, it is characterised in that: the resonance response of the elasticity vibrating diaphragm
Frequency range is 30Hz-100Hz.
8. a kind of passive type fetal rhythm monitoring device, it is characterised in that: including component described in claim 1 and preposition amplification
From gain amplifier and MCU processor, the input terminal of the preamplifier connects institute by device, trapper, bandpass filter, AGC
State coil, output end connects the trapper, and the trapper, bandpass filter, AGC are from gain amplifier and MCU processor
It is sequentially connected.
9. passive type fetal rhythm monitoring device according to claim 8, it is characterised in that: the equipment further includes pressure sensing
Device, low-frequency amplifier and analog-digital converter, the pressure sensor, low-frequency amplifier, analog-digital converter, MCU processor are successively
Connection.
10. passive type fetal rhythm monitoring device according to claim 8, it is characterised in that: the equipment further includes channel radio
Module and power module are interrogated, the wireless communication module connects the MCU processor, and the power module is the power supply of each device.
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| CN201820771669.4U CN208864314U (en) | 2018-05-23 | 2018-05-23 | A kind of passive type fetal rhythm monitoring assembly and equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108703750A (en) * | 2018-05-23 | 2018-10-26 | 江苏信臣健康科技股份有限公司 | A kind of passive type fetal rhythm monitoring assembly and equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108703750A (en) * | 2018-05-23 | 2018-10-26 | 江苏信臣健康科技股份有限公司 | A kind of passive type fetal rhythm monitoring assembly and equipment |
| CN108703750B (en) * | 2018-05-23 | 2024-09-03 | 江苏信臣健康科技股份有限公司 | Passive fetal heart monitoring component and equipment |
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