CN222870534U - A vibrating device for fetal heart simulation - Google Patents
A vibrating device for fetal heart simulation Download PDFInfo
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- CN222870534U CN222870534U CN202421440958.8U CN202421440958U CN222870534U CN 222870534 U CN222870534 U CN 222870534U CN 202421440958 U CN202421440958 U CN 202421440958U CN 222870534 U CN222870534 U CN 222870534U
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Abstract
本实用新型提供一种用于胎心模拟的振动装置，包括用于实现胎儿心率与心跳强度参数设置或典型胎儿心率波形选择及数据显示的人机交互模块，根据人机交互模块设置的参数或选择的波形输出数字电流信号的主控模块，将数字电流信号转换为模拟电流信号后通过运算放大器形成双极性电压信号的D/A转换电路，将双极性电压信号进行线性调节后通过功率放大器放大产生足以驱动扬声器振动电压的功率放大电路，根据放大产生的电压进行振动的扬声器，以及给主控模块提供电源的电源模块。本装置通过采用扬声器结构可巧妙地实现靶向球上下垂直振动，扬声器的振膜弹性使得靶向球振动幅度一致性较好，克服了传统磁性靶向球在变化磁场中的无序振动，振动幅度线性可调。
The utility model provides a vibration device for fetal heart simulation, including a human-computer interaction module for realizing the setting of fetal heart rate and heartbeat intensity parameters or the selection of typical fetal heart rate waveform and data display, a main control module for outputting digital current signals according to the parameters set by the human-computer interaction module or the selected waveform, a D/A conversion circuit for converting the digital current signal into an analog current signal and then forming a bipolar voltage signal through an operational amplifier, a power amplifier circuit for linearly adjusting the bipolar voltage signal and then amplifying it through a power amplifier to generate a voltage sufficient to drive a speaker to vibrate, a speaker that vibrates according to the voltage generated by the amplification, and a power supply module for providing power to the main control module. The device can cleverly realize the vertical vibration of the target ball up and down by adopting a speaker structure, and the elasticity of the diaphragm of the speaker makes the vibration amplitude of the target ball more consistent, overcoming the disordered vibration of the traditional magnetic target ball in a changing magnetic field, and the vibration amplitude is linearly adjustable.
Description
Technical Field
The utility model relates to the technical field of fetal heart detection, in particular to a vibration device for fetal heart simulation.
Background
Fetal heart rate monitoring is one of the main methods of perinatal health care and is widely used clinically. The ultrasonic Doppler fetal monitor and the fetal heart monitor are very popular products applied to the obstetrical clinical field, ultrasonic waves are emitted to fetal heart tissues, meanwhile, ultrasonic echoes generated by the ultrasonic Doppler fetal monitor and the fetal heart monitor are subjected to signal demodulation processing, ultrasonic Doppler frequency shift signals generated by fetal heart motion are obtained, and real-time heart rate data are obtained through calculation and analysis to reflect the functional health condition of the fetal heart. By applying the fetal heart monitoring technology, the occurrence rate of fetal intrauterine embarrassment, fetal brain damage, neonatal asphyxia and death can be reduced, the health care quality of women and children in the perinatal period can be improved, and the pregnancy risk can be reduced. The standard and technical specifications of YY/T0448-2019 ultrasonic Doppler fetal heart rate meter, YY/T0449-2018 ultrasonic Doppler fetal monitor, YY/T0749-2009 ultrasonic handheld probe type Doppler fetal heart rate detector performance requirements, measuring and reporting methods, JJG 893-2007 ultrasonic Doppler fetal heart rate meter ultrasonic source verification regulations and the like all provide requirements for quality and accuracy of the fetal heart rate meter. The quality evaluation of the fetal heart rate instrument is mainly detected by a fetal heart rate simulator, and indexes comprise fetal heart rate accuracy, detection depth, sensitivity and the like. One technical route adopted by the current fetal heart simulator is to change the magnetic field direction by using the current of a control coil to drive the magnetic targeting ball to vibrate in a reciprocating manner. The inventor of the application discovers that the magnetic targeting ball is easy to generate disorder vibration in a non-vertical direction, and the vibration amplitude of the magnetic targeting ball is difficult to be consistent under the actions of inertia and gravity.
Disclosure of utility model
Aiming at the technical problems that the magnetic targeting ball is easy to generate disordered vibration in a non-vertical direction and the vibration amplitude of the magnetic targeting ball is difficult to be consistent under the actions of inertia and gravity in the traditional mode of changing the magnetic field direction by utilizing the current of a control coil to drive the magnetic targeting ball to vibrate in a reciprocating manner, the utility model provides a vibration device for fetal heart simulation.
In order to solve the technical problems, the utility model adopts the following technical scheme:
The utility model provides a vibrating device for fetal heart simulation, includes man-machine interaction module, main control module, D/A converting circuit, power amplification circuit, speaker and power module, man-machine interaction module is connected with main control module and is used for realizing fetal heart rate and heart beat intensity parameter setting or typical fetal heart rate waveform selection and data display, main control module is according to the parameter or the waveform output digital current signal that the man-machine interaction module set up, D/A converting circuit is connected with main control module and is used for forming bipolar voltage signal through operational amplifier after converting digital current signal into analog current signal, power amplification circuit is connected with D/A converting circuit and is used for carrying out linear regulation with bipolar voltage signal and then produces the voltage that is enough to drive speaker vibration through power amplifier, speaker and power amplification circuit are connected and are used for vibrating according to the voltage that the amplification produced, power module is connected with main control module and is used for providing the power.
Further, the D/a conversion circuit includes a D/a conversion chip that converts a digital current signal into an analog current signal, a first operational amplifier that converts the analog current signal into an analog voltage signal, and a second operational amplifier that converts the analog voltage signal into a bipolar voltage signal.
Further, the power amplification circuit includes a potentiometer for linearly adjusting the bipolar voltage signal, a power amplifier for filtering the linearly adjusted bipolar voltage signal, and a power amplifier for amplifying the filtered bipolar voltage signal to generate a voltage sufficient to drive the speaker to vibrate.
Further, the first fixed end of the potentiometer is connected with the output end of the D/A conversion circuit, the second fixed end of the potentiometer is grounded, and the movable end of the potentiometer is connected with the input end of the power amplifier through the power amplifier.
Further, the vibrating diaphragm of the loudspeaker is made of expanded polytetrafluoroethylene material, and the surface of the expanded polytetrafluoroethylene material is coated with sound absorption materials.
Compared with the prior art, the vibration device for fetal heart simulation has the advantages that the fetal heart and heart beat intensity parameters are set through the human-computer interaction module, or the typical fetal heart rate waveform is selected and displayed, the main control module outputs a digital current signal according to the parameters or the selected waveform set by the human-computer interaction module, the D/A conversion circuit converts the digital current signal into an analog current signal and then forms a bipolar voltage signal through the operational amplifier, the power amplification circuit linearly adjusts the bipolar voltage signal and then amplifies the bipolar voltage signal through the power amplifier to generate voltage which is sufficient for driving the loudspeaker to vibrate, and the loudspeaker vibrates according to the amplified voltage, so that the vibrating diaphragm of the loudspeaker drives the targeting ball to move up and down in deaerated water, thereby simulating fetal heart beat. The device can skillfully realize vertical vibration of the target ball by adopting a loudspeaker structure, the vibration amplitude of the target ball is better consistent by the vibration membrane elasticity of the loudspeaker, the disordered vibration of the traditional magnetic target ball in a changing magnetic field is overcome, and the vibration amplitude of the target ball is related to the vibration intensity of the vibration membrane of the loudspeaker, so that the vibration amplitude can be linearly regulated by a power amplifying circuit.
Drawings
Fig. 1 is a schematic block diagram of a vibration device for fetal heart simulation provided by the present utility model.
Fig. 2 is a circuit schematic diagram of the D/a conversion circuit in fig. 1.
Fig. 3 is a circuit schematic diagram of the power amplifying circuit in fig. 1.
In the figure, 1, a man-machine interaction module, 2, a main control module, 3, a D/A conversion circuit, 4, a power amplification circuit, 5, a loudspeaker and 6, and a power supply module.
Detailed Description
The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.
In the description of the present utility model, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, the present utility model provides a vibration device for fetal heart simulation, which includes a man-machine interaction module 1, a main control module 2, a D/a conversion circuit 3, a power amplification circuit 4, a speaker 5 and a power module 6, wherein the man-machine interaction module 1 is connected with the main control module 2 for implementing fetal heart rate and heart beat intensity parameter setting or typical fetal heart rate waveform selection and data display, that is, the man-machine interaction module 1 is used for implementing parameter setting or waveform selection and data display, and can implement input data setting by setting fetal heart rate and heart beat intensity parameters or selecting an existing typical fetal heart rate waveform, the man-machine interaction module 1 can be implemented specifically by adopting an existing touch screen, the main control module 2 outputs a digital current signal according to parameters set by the man-machine interaction module 1 or selected waveforms, the D/a conversion circuit 3 is connected with the main control module 2 for converting the digital current signal into an analog current signal and then forming a bipolar voltage signal by an operational amplifier, the power amplification circuit 4 is connected with the D/a power conversion circuit 3 for implementing linear adjustment of the bipolar voltage signal and then generating a sufficient voltage for driving the speaker by amplifying the power amplifier, and the main control module 4 is connected with the power module 6 for generating vibration voltage by the power module 1. The main control module 2 controls the integrity of the device, and can be realized by adopting a chip with the existing model STM32L053, wherein the chip is an ultralow-power-consumption 32-bit microcontroller, integrates a memory protection unit, a high-speed embedded memory and various enhanced I/O and peripheral resources, and controls a D/A conversion circuit to generate a voltage signal waveform.
As an embodiment, referring to fig. 2, the D/a conversion circuit 3 includes a D/a conversion chip for converting a digital current signal into an analog current signal, a first operational amplifier OA1 for converting the analog current signal into an analog voltage signal, and a second operational amplifier OA2 for converting the analog voltage signal into a bipolar voltage signal. Specifically, the D/a conversion chip is an integrated chip with a model of DAC0832, and is composed of an 8-bit input latch, an 8-bit DAC register, an 8-bit D/a conversion circuit, and a conversion control circuit, and is connected to the main control module STM32L053 chip by a two-stage buffer connection method to realize synchronous output, and the analog current amount output by the integrated chip is directly proportional to the input digital current amount (D0-D7), and the output is a current signal, so that the output must be converted into a voltage signal by an external operational amplifier, i.e. the first operational amplifier OA1, and the voltage signal is required to be bipolar, and the conversion circuit, i.e. the second operational amplifier OA2, needs to be connected again to form a front-end signal of the power amplification circuit, i.e. a bipolar voltage signal. The output voltage range of the D/a conversion circuit 3 varies between-V REF～+VREF, V REF is the reference voltage, 10V in this embodiment, and the minimum resolution of the output voltage is 10/2 8≈0.04V,VOUT is the input signal of the power amplifying circuit 4.
As a specific embodiment, referring to fig. 3, the power amplifying circuit 4 includes a potentiometer RP1 for linearly adjusting the bipolar voltage signal, a power amplifier C1 for filtering the linearly adjusted bipolar voltage signal, and a power amplifier for amplifying the filtered bipolar voltage signal to generate a voltage sufficient to drive the speaker 5 to vibrate. Specifically, the potentiometer RP1 is composed of a resistor and a brush that can move along the resistor, the first fixed end of the potentiometer RP1 is connected with the output end V OUT of the D/a conversion circuit 3, the second fixed end of the potentiometer RP1 is grounded, the movable end of the potentiometer RP1 is connected with the input end of the power amplifier through the power amplifier C1, and when the brush moves along the resistor, a voltage proportional to the displacement can be obtained at the output end, thereby linearly adjusting the voltage before entering the power amplifier. The value of the power amplifier C1 is 10uF, and besides the basic characteristic of blocking the direct current and the alternating current, the power amplifier can also resist the interference caused by electromagnetic interference and power change along with time, inhibit additional noise and clutter, improve the accuracy of audio signals, and play a role in stabilizing voltage distribution, thereby effectively protecting the power amplifier circuit. The power amplifier can be realized by successfully amplifying the existing LM386 audio frequency set, the voltage gain adjustable range of the integrated power amplifier is 20-200 times, and the purpose of the power amplifier is to amplify the weak voltage signal of the front-stage operational amplifier to enable the weak voltage signal to reach the voltage sufficient for driving the loudspeaker, and then the vibrating diaphragm of the loudspeaker vibrates to drive the targeting ball to move up and down in deaerated water, so that fetal heart beating is simulated.
As a specific embodiment, the loudspeaker 5 is made of waterproof design, the diaphragm of the loudspeaker 5 is made of the existing expanded polytetrafluoroethylene material, the material is a novel medical polymer material, has good elasticity and flexibility, has anti-corrosion and anti-wear characteristics, the waterproof grade reaches the IPX7 level, compared with the traditional loudspeaker diaphragm, the diaphragm made of the expanded polytetrafluoroethylene material is coated with an ultrathin sound absorption material, the material has tiny pores, can allow air to circulate (realize the functions of heat dissipation and pressure relief), can weaken the sound interference generated by the loudspeaker, and can effectively block moisture and dust particles, and the sound absorption material can be realized by adopting the existing porous material.
Compared with the prior art, the vibration device for fetal heart simulation has the advantages that the fetal heart and heart beat intensity parameters are set through the human-computer interaction module, or the typical fetal heart rate waveform is selected and displayed, the main control module outputs a digital current signal according to the parameters or the selected waveform set by the human-computer interaction module, the D/A conversion circuit converts the digital current signal into an analog current signal and then forms a bipolar voltage signal through the operational amplifier, the power amplification circuit linearly adjusts the bipolar voltage signal and then amplifies the bipolar voltage signal through the power amplifier to generate voltage which is sufficient for driving the loudspeaker to vibrate, and the loudspeaker vibrates according to the amplified voltage, so that the vibrating diaphragm of the loudspeaker drives the targeting ball to move up and down in deaerated water, thereby simulating fetal heart beat. The device can skillfully realize vertical vibration of the target ball by adopting a loudspeaker structure, the vibration amplitude of the target ball is better consistent by the vibration membrane elasticity of the loudspeaker, the disordered vibration of the traditional magnetic target ball in a changing magnetic field is overcome, and the vibration amplitude of the target ball is related to the vibration intensity of the vibration membrane of the loudspeaker, so that the vibration amplitude can be linearly regulated by a power amplifying circuit.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.
Claims (5)
1. The utility model provides a vibrating device for fetal heart simulation, its characterized in that includes man-machine interaction module, main control module, D/A converting circuit, power amplification circuit, speaker and power module, man-machine interaction module is connected with main control module and is used for realizing fetal heart rate and heart beat intensity parameter setting or typical fetal heart rate waveform selection and data display, main control module is according to the parameter or the waveform output digital current signal that the man-machine interaction module set up, D/A converting circuit is connected with main control module and is used for forming bipolar voltage signal through operational amplifier after converting digital current signal into analog current signal, power amplification circuit is connected with D/A converting circuit and is used for carrying out linear regulation with bipolar voltage signal and then produce the voltage that is enough to drive the speaker vibration through power amplifier, speaker and power amplification circuit are connected and are used for vibrating according to the voltage that the amplification produced, power module is connected with main control module and is used for providing the power.
2. The vibration apparatus for fetal heart simulation of claim 1 wherein the D/a conversion circuit comprises a D/a conversion chip that converts a digital current signal to an analog current signal, a first operational amplifier that converts the analog current signal to an analog voltage signal, and a second operational amplifier that converts the analog voltage signal to a bipolar voltage signal.
3. The vibration apparatus for fetal heart simulation of claim 1 wherein the power amplification circuit comprises a potentiometer that linearly adjusts the bipolar voltage signal, a power amplifier that filters the linearly adjusted bipolar voltage signal, and a power amplifier that amplifies the filtered bipolar voltage signal to produce a voltage sufficient to drive the speaker to vibrate.
4. A vibration device for fetal heart simulation as claimed in claim 3, wherein the first fixed end of the potentiometer is connected with the output end of the D/a conversion circuit, the second fixed end of the potentiometer is grounded, and the movable end of the potentiometer is connected with the input end of the power amplifier through the power amplifier.
5. The vibration apparatus for fetal heart simulation of claim 1 wherein the diaphragm of the speaker is made of expanded polytetrafluoroethylene material having a sound absorbing material coated on a surface thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421440958.8U CN222870534U (en) | 2024-06-24 | 2024-06-24 | A vibrating device for fetal heart simulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421440958.8U CN222870534U (en) | 2024-06-24 | 2024-06-24 | A vibrating device for fetal heart simulation |
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| Publication Number | Publication Date |
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| CN222870534U true CN222870534U (en) | 2025-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202421440958.8U Active CN222870534U (en) | 2024-06-24 | 2024-06-24 | A vibrating device for fetal heart simulation |
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| CN (1) | CN222870534U (en) |
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- 2024-06-24 CN CN202421440958.8U patent/CN222870534U/en active Active
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