CN220001797U

CN220001797U - Digital stethoscope system based on piezoelectric film

Info

Publication number: CN220001797U
Application number: CN202223504530.9U
Authority: CN
Inventors: 任凯亮; 田钧元
Original assignee: Beijing Institute of Nanoenergy and Nanosystems
Current assignee: Beijing Institute of Nanoenergy and Nanosystems
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-11-14
Anticipated expiration: 2032-12-27

Abstract

The utility model provides a digital stethoscope system based on a piezoelectric film, and belongs to the field of cardiovascular condition measurement. The stethoscope comprises a stethoscope based on a piezoelectric film, a data acquisition device and a mobile terminal; the stethoscope is used for collecting sound signals and/or vibration signals of a detection object and converting the sound signals and/or vibration signals into electric signals; the data acquisition device is electrically connected with the stethoscope and is used for receiving the electric signal of the stethoscope, processing the electric signal and transmitting the processed data to the mobile terminal; the mobile terminal is in wireless connection with the data acquisition device and is used for receiving data sent by the data acquisition device and drawing data waveforms according to the data. The scheme is used for solving the problems that the traditional stethoscope cannot display signal waveforms in real time and cannot transmit and record real-time monitoring data, and a user can directly check the monitoring data of the stethoscope on a mobile terminal application program in real time; meanwhile, the contact surface of the stethoscope has flexibility, can eliminate the influence of body temperature signals or environmental electromagnetic field noise when detecting heart sounds, and has high accuracy.

Description

Digital stethoscope system based on piezoelectric film

Technical Field

The utility model relates to the field of cardiovascular condition measurement, in particular to a digital stethoscope system based on a piezoelectric film.

Background

A digital stethoscope is an electronic device that collects sound or vibration signals from the body using electronic technology, converts a target signal into an electrical signal, and processes the electrical signal. Piezoelectric transducers are well suited as digital stethoscopes because they can passively perform electromechanical conversion. The detection objects of the piezoelectric digital stethoscope are Ballistocardiogram (BCG), pulse signal, and heart sound signal. Ballistocardiograms and widely used Electrocardiographs (ECGs) are of considerable medical value in reflecting heart health. Unlike an electrocardiogram, which reflects bioelectric changes in the body surface caused by heart activity, a ballistocardiogram is mechanical vibration characteristic information accompanying heart activity and blood movement. The two have good consistency although the attributes are different and the waveforms are different. Because both are caused by heart activity and arterial ejection, the periods of the two are consistent, and each characteristic component of the waveform has a good contrast relationship on the same measurement point of the body surface, and both contain important health information. The heart sound signal is a sound signal generated by heart activity and having a relatively high frequency in the range of about 80-400Hz. Heart sound intensity, frequency, and interrelationships can reflect heart valve, myocardial function, and endocardial blood flow conditions, which are one of the important evidences when a doctor uses a stethoscope for diagnosis. However, heart sound-based diagnosis has common criteria but difficulty in standard quantification due to individual differences of patients and subjectivity of hearing feeling of doctors. The advent of digital stethoscopes enabled doctors to quantitatively analyze recorded heart sound signals.

Therefore, in modern life with an outstanding personalized medical science, the autonomous health monitoring of individuals is completely performed by means of a digital stethoscope, and more important in terms of functions, the data can be accurately measured and stored, so that a remote doctor can conveniently provide online guidance or basic data for special health state analysis software. Therefore, the portable stethoscope system which has the advantages of high accuracy, simplicity, easiness in use, low cost, small size and capability of displaying signal waveforms in real time can reduce barriers for monitoring the health state of a user at any time and enrich the means for preventing the heart diseases.

Disclosure of Invention

Aiming at the problems, the embodiment of the utility model aims to provide a digital stethoscope system based on a piezoelectric film, which is used for partially solving the technical problems that the traditional stethoscope cannot display signal waveforms in real time, cannot transmit and record real-time monitoring data and the like, and a user can directly check the monitoring data of the stethoscope on a mobile terminal application program in real time when using the system.

The utility model provides a digital stethoscope system based on a piezoelectric film, which comprises:

stethoscope based on piezoelectric film, data acquisition device and mobile terminal;

the stethoscope is used for collecting sound signals and/or vibration signals of a detection object and converting the sound signals and/or vibration signals into electric signals;

the data acquisition device is electrically connected with the stethoscope and is used for receiving an electric signal of the stethoscope, processing the electric signal and transmitting processed data to the mobile terminal;

the mobile terminal is in wireless connection with the data acquisition device and is used for receiving data sent by the data acquisition device and drawing data waveforms according to the data.

Optionally, the stethoscope comprises a flexible piezoelectric film, a supporting sheet, an upper cover and a lower cover;

the piezoelectric film is positioned between the upper cover and the supporting sheet and is flatly tensioned at one side of the supporting sheet, electrodes are additionally arranged on two sides of the piezoelectric film, and a cavity is formed between the lower cover and the supporting sheet.

Optionally, the stethoscope and the data acquisition device are mutually independent devices, and the data acquisition device is connected with the stethoscope through a wiring part, and the wiring part is positioned on the surface of the lower cover or transversely penetrates the interior of the lower cover;

the digital stethoscope system further comprises a first connecting wire and a second connecting wire, wherein the first connecting wire is positioned in the cavity and is used for connecting the piezoelectric film with the wiring part, the first connecting wire is connected with the second connecting wire at the wiring part, and the other end of the second connecting wire is connected to the data acquisition device.

Optionally, the connection line is a radio frequency line, and the connection line has an insulating layer and/or a shielding layer.

Optionally, the stethoscope and the data acquisition device are integrated devices, the data acquisition device is located in the cavity, and a partition part is arranged in the cavity and separates the data acquisition device from the piezoelectric film.

Optionally, the data acquisition device comprises a voltage amplification module, a noise reduction module, an analog-to-digital conversion module, a microprocessor and a wireless communication module, and the electric signals are processed by the voltage amplification module, the noise reduction module, the analog-to-digital conversion module and the microprocessor in sequence;

the voltage amplification module is used for amplifying the electric signal, the noise reduction module is used for carrying out noise reduction on the electric signal, the analog-to-digital conversion module is used for converting the electric signal into a digital signal from an analog signal, the microprocessor is used for processing the digital signal according to a data processing program stored in the microprocessor, and the wireless communication module is used for sending processed data to the mobile terminal.

Optionally, the voltage amplification module and the noise reduction module are configured to be able to match an output impedance of the stethoscope.

Optionally, the voltage amplifying module is provided with a voltage stabilizing unit, and the noise reducing module is a low-pass filter and can adjust the cut-off frequency of the filter circuit.

Optionally, the data acquisition device further comprises a power management module and a battery, wherein the power management module receives an electric input from the battery and performs voltage stabilization processing on the electric input to supply power for the voltage amplification module, the analog-to-digital conversion module, the microprocessor and the wireless communication module.

Optionally, the power management module, the analog-to-digital conversion module and the microprocessor are integrated in a single-chip microcomputer development board, and the single-chip microcomputer development board is an Arduino UNO development board.

Optionally, the wireless connection manner between the mobile terminal and the data acquisition device is at least one selected from the following: wiFi, 4G, 5G, bluetooth, zigBee.

Optionally, the mobile terminal is provided with a button for enlarging or reducing the display range of the data size, and the mobile terminal is provided with a data storage button.

The beneficial effects of the utility model are as follows:

1) The stethoscope is connected with the mobile terminal in a wireless way, so that data acquired by the stethoscope can be sent to the mobile terminal and signal waveforms can be displayed on an application program of the mobile terminal in real time, and a user can conveniently check real-time monitoring data of heart activities;

2) The piezoelectric film is flexible, so that the stethoscope can be flatly tensioned on the surface of the stethoscope, the optimal sensitivity of the stethoscope in response to external vibration can be provided, meanwhile, the flexible piezoelectric film can enhance the comfort level of the user, and the measurement experience is improved;

3) The data acquisition device is arranged in the stethoscope, so that the stethoscope system is small in size and convenient to carry;

4) The processing module in the data acquisition device can amplify, reduce noise and perform digital-to-analog conversion processing on the acquired signals, so that the influence of external body temperature or environmental electromagnetic field noise on the acquired signals is minimized, the function of a digital stethoscope which is not affected by temperature and electromagnetic interference can be realized, and the measurement accuracy is improved;

5) The buttons arranged on the mobile terminal can be used for conveniently checking waveforms by a user through adjusting the waveform display range, and meanwhile, the data storage buttons are arranged, so that a remote doctor can conveniently provide online guidance, basic data can be provided for special health state analysis software, and the portable terminal has high application value in the aspects of wearable health monitoring, home medical treatment, internet of things and the like.

Additional features and advantages of embodiments of the utility model will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain, without limitation, the embodiments of the utility model. In the drawings:

FIG. 1 schematically illustrates a schematic of a stethoscope system based on piezoelectric film, according to an embodiment of the present utility model;

FIG. 2 schematically illustrates a structural diagram of a piezoelectric film based stethoscope according to an embodiment of the present utility model;

FIG. 3 schematically shows a schematic structure of a data acquisition device according to an embodiment of the present utility model;

FIG. 4 schematically illustrates an application interface diagram of a mobile terminal according to an embodiment of the utility model;

FIG. 5 schematically illustrates heart sound signals acquired by a piezoelectric film based stethoscope in accordance with an embodiment of the present utility model;

fig. 6 schematically shows a data waveform diagram obtained by performing heartbeat acquisition according to an embodiment of the present utility model.

Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the utility model; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present utility model by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.

The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present utility model, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.

The structure of the digital stethoscope system based on the piezoelectric film of the utility model is shown in fig. 1, and mainly comprises: a stethoscope 110 based on piezoelectric film, a data acquisition device 120 and a mobile terminal 130.

The stethoscope 110 is used to collect sound signals and/or vibration signals of a test object and convert them into electrical signals. Preferably, the detection target object may be a ballistocardiogram, a pulse, and a heart sound signal, for example, the stethoscope 110 may acquire the ballistocardiogram while being attached to the skin surface at the heart.

The data acquisition device 120 is electrically connected to the stethoscope 110, and is configured to receive an electrical signal of the stethoscope 110, process the electrical signal, and transmit the processed data to the mobile terminal 130. Preferably, the data acquisition device 120 is connected to the stethoscope 110 through a radio frequency line, acquires the electrical signals of the stethoscope 110 and transmits the data to the mobile terminal 130 through a built-in wireless transmission module.

The mobile terminal 130 is wirelessly connected with the data acquisition device 120, and is configured to receive data sent by the data acquisition device 120 through the wireless transmission module, draw a data waveform according to the sent data, and store the data.

The stethoscope 110 is structured as shown in fig. 2, and mainly includes a piezoelectric film 112, a supporting sheet 113, and a housing. The housing is composed of an upper cover 111 and a lower cover 116. The piezoelectric film 112 is a sensitive layer that can sense external sound or vibration, and converts the sound or vibration into an electrical signal output, the frequency of which is generally consistent with the frequency of the external vibration, and the amplitude of which is generally proportional to the amplitude of the external vibration. The support sheet 113 has a convex surface and enables the piezoelectric film 112 to be stretched flat on the surface of the stethoscope 110 to provide optimal sensitivity of the stethoscope 110 to external vibrations. Preferably, the piezoelectric film 112 is pressed by the upper cover 111 and the support sheet 113, and is flatly tensioned on the convex surface of the support sheet 113. The housing is used to secure the piezoelectric film 112 while enclosing all of the components inside the stethoscope 110. In addition, the cavity 115 may be formed by arranging the components inside the stethoscope 110 in a specific manner, and preferably, the cavity 115 is formed between the lower cover 116 and the support sheet 113.

Optionally, the stethoscope 110 further includes a connection line (not shown) for connecting the piezoelectric film 112 with the data acquisition device 120 to conduct the electrical signal output from the piezoelectric film 112, including but not limited to radio frequency lines, etc. Preferably, the connection line has an insulating layer or/and a shielding layer to minimize interference of static electricity or external noise.

In some embodiments, piezoelectric film 112 may be formed of a piezoelectric polymer material selected to ensure adequate contact tightness and comfort, including but not limited to, poly-L-lactic acid, poly-D-lactic acid, poly-vinylidene fluoride, and other piezoelectric polymers, preferably poly-L-lactic acid, poly-D-lactic acid, because such materials do not have pyroelectric properties, which may improve the accuracy of the stethoscope signal acquisition. Preferably, both sides of the piezoelectric film 112 are plated with a conductive material including, but not limited to, gold, silver, copper, aluminum, indium tin oxide, and the like.

In some embodiments, the support sheet 113 is made of a plastic material that provides a strong support while having a low stiffness so as to avoid damaging the piezoelectric film with sharp edges of the metal material. Preferably, the material of the support sheet 113 is polytetrafluoroethylene.

In some embodiments, the structure and dimensions of the stethoscope 110 may be adjusted according to the actual needs, and the key features include the geometric dimensions of the stethoscope itself, the structure and materials of the support sheet, and the materials and packaging of the housing.

In some embodiments, the stethoscope 110 and the data acquisition device 120 are arranged as separate components. In this case, the digital stethoscope system further includes a wiring portion 114, a first connection line and a second connection line, the wiring portion 114 being located on the surface of the lower cover 116 or traversing the interior of the lower cover 116 for providing a connection point of the stethoscope 110 to the data acquisition device 120; the first connection line is located in the cavity 115 and connects the piezoelectric film 112 with the connection part 114 through the support sheet 113, the first connection line is connected with the second connection line at the connection part 114, and the other end of the second connection line is connected to the data collection device 120, thereby connecting the stethoscope 110 to the data collection device 120. Optionally, in an embodiment of the present utility model for principle verification, the wire connection portion 114 is a wire holder of an SMA wire, and the second connection wire is an SMA-to-BNC wire; preferably, the connection portion 114 is a socket of a BNC wire, and the second connection wire is a BNC wire.

In some embodiments, the stethoscope 110 is arranged as an integral device with the data acquisition device 120. The data acquisition device 120 is a miniaturized integrated circuit fabricated by a micro-electro-mechanical system (MEMS) fabrication process, and thus can be integrated with the stethoscope 110 in a portable device. In this case, the cavity 115 may be used to provide a receiving space for the data acquisition device 120. The piezoelectric film 112 is directly connected to the data collection device 120 through a connection line without the wiring portion 114. Optionally, the cavity 115 has a partition therein for separating the piezoelectric film 112 from the data acquisition device 120 and for electrically insulating and electromagnetically shielding the cavity 115.

The data acquisition device 120 mainly comprises a microprocessor 121, a voltage amplification module 122, a noise reduction module 123, an analog-to-digital conversion module 124, a wireless communication module 125, a power management module 126 and a battery 127, as shown in fig. 3. The signal from the stethoscope 110 enters the data acquisition device 120 from the signal input end of the voltage amplification module 122, and is processed by the voltage amplification module 122, the noise reduction module 123, the analog-to-digital conversion module 124 and the microprocessor 121 in sequence, and finally is sent to the mobile end 130 through the wireless communication module 125.

The voltage amplification module 122 can perform preliminary amplification processing on the original analog signal from the stethoscope 110 in real time, so that the original analog signal meets the basic requirement of electrical processing, and the pre-amplified analog signal enters the noise reduction module 123. In some embodiments, the voltage amplifying module 122 may be attached with a voltage stabilizing unit, so as to provide a required stable supply voltage and a reference voltage for the voltage amplifying module 122, so as to ensure the stability of the voltage amplifying function.

The noise reduction module 123 is configured to remove extraneous signals, such as sound signals generated by heart and lung activities, especially high frequency noise, introduced during the signal acquisition of the stethoscope 110, and remove and/or suppress electrical noise generated by the voltage amplification module 122, and then transmit the analog signal after noise reduction to the analog-to-digital conversion module 124. Optionally, the noise reduction module 123 is a low pass filter; optionally, the noise reduction module 123 is composed of a simple low-pass filter circuit including a resistor and a capacitor, and the cut-off frequency of the filter circuit can be changed by adjusting the selection of the resistor and the capacitor; optionally, the noise reduction module 123 is composed of a complex filter circuit including one or several chips to provide a richer filter characteristic.

Preferably, the voltage amplifying module 122 and the noise reducing module 123 provided by the present utility model are specially designed according to the electrical characteristics of the stethoscope 110, so that the high output impedance of the piezoelectric film 112 can be matched. Specifically, the voltage amplification module 122 uses a charge integration circuit to match the high output impedance of the piezoelectric film 122. For example, the noise reduction module 123 may adjust the cut-off frequency of the filter circuit by adjusting the structure and the oscillation frequency of the circuit according to the characteristics of the detection signal.

The analog-to-digital conversion module 124 is configured to convert the pre-processed analog signal into a digital signal, and transmit the digital signal to the microprocessor 121. Optionally, the analog-to-digital conversion module 124 converts the analog signal subjected to the amplification and noise reduction process into a digital signal under the control of a clock signal from the microprocessor 121.

The microprocessor 121 stores a data processing program, processes a signal according to the data processing program, and transmits the processed signal to the wireless communication module 125. Alternatively, the microprocessor 121 may control the analog-to-digital conversion module 124 and the wireless communication module 125, for example, the wireless communication module 125 may be controlled to broadcast or transmit data point-to-point to the bound mobile device.

The wireless communication module 125 is configured to send information transferred by the microprocessor 121 to the mobile terminal 130. Optionally, the communication manner of the wireless communication module 125 includes, but is not limited to, wiFi, 4G, 5G, bluetooth, zigBee, and the like.

The power management module 126 is configured to receive electrical input from the battery 127 and to stabilize it while providing a stable power supply to the overall/partial data acquisition device 120. Preferably, the power supply connection lines are as shown by the dashed lines in fig. 3, and the modules that need to be powered by the power management module 126 include a microprocessor 121, a voltage amplification module 122, an analog-to-digital conversion module 124, and a wireless communication module 125.

In the embodiment of the present utility model for principle verification, the power management module 126, the analog-to-digital conversion module 124 and the microprocessor 121 may be integrated inside the single-chip microcomputer development board, in other words, the microprocessor 121, the analog-to-digital conversion module 124 and the power management module 126 in the data acquisition device 120 may be implemented instead by integrated functions in the single-chip microcomputer development board. Optionally, the single chip development board includes, but is not limited to, an Arduino UNO development board. The specific working process is that the analog signal after noise reduction treatment is connected to an analog signal port of the Arduino UNO development board to be used as signal input, and the digital signal port of the Arduino UNO development board is connected to the wireless communication module 125 to be used as signal output.

In the aspect of system power supply, the power supply of the Arduino UNO development board can adopt a scheme that a USB interface is connected to a computer for power supply, and can also adopt a scheme that a rechargeable lithium battery or a dry battery is used for power supply. In some embodiments, where the device is required to be as small as possible, the power may be supplied using a button cell, for example, a 3-cell 3V lithium manganese button cell.

Fig. 4 is a schematic diagram of an application program interface of the mobile terminal 130 according to an embodiment of the present utility model. The mobile terminal 130 and its application program have functions including, but not limited to, connecting to the wireless communication module 125, continuously drawing waveforms according to the data received by the communication module itself, adjusting the waveform display range, storing data to a file, etc.

In some embodiments, the application program at the mobile end receives the data sent by the data acquisition device 120 by calling the wireless communication module of the mobile device, draws the data points as a line graph and prints the line graph on the screen in real time. Optionally, the wireless communication module of the mobile device includes, but is not limited to, a mobile phone bluetooth module, a WiFi module, a 4G module, and a 5G module.

In some embodiments, the application program of the mobile terminal is provided with a button for enlarging or reducing the display range of the data size, and the display range can be adjusted by the size of the user data, so that the user can conveniently view the waveform.

In some embodiments, the application on the mobile side is provided with a data save button, and by clicking on this button, the application can locally generate a text document and save the received data in the text document.

The working flow of the digital stethoscope system based on the piezoelectric film for heart sound collection test is as follows:

first, a heart sound collection test is performed using the stethoscope 110, and an analog signal directly output is shown in fig. 5. The signal is heart sound signal of the tested object, and can be used for quantitatively analyzing cardiovascular health state of the tested object.

Then, the signals collected by the stethoscope 110 are transmitted to the data collection device 120 for processing, the processed data are sent to the mobile terminal 130, a data file is generated according to the application program of the mobile terminal 130, and a ballistocardiogram of the tested person is drawn as shown in fig. 6. The data shows that the heart rate of the tested person is 80 beats/minute and is within the range of the heart rate of a normal adult, and the frequency of the ballistocardiogram acquired by the digital stethoscope system is consistent with the frequency of the heart activity.

Through the technical scheme, the digital stethoscope system based on the piezoelectric film has the beneficial effects that:

In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A digital stethoscope system based on piezoelectric film, comprising:

2. The digital stethoscope system as defined in claim 1 wherein,

the stethoscope comprises a flexible piezoelectric film, a supporting sheet, an upper cover and a lower cover;

3. The digital stethoscope system as defined in claim 2 wherein,

the stethoscope and the data acquisition device are mutually independent devices, the data acquisition device is connected with the stethoscope through a wiring part, and the wiring part is positioned on the surface of the lower cover or transversely penetrates through the lower cover;

4. The digital stethoscope system as defined in claim 3 wherein,

the connecting wire is a radio frequency wire and is provided with an insulating layer and/or a shielding layer.

5. The digital stethoscope system as defined in claim 2 wherein,

the stethoscope and the data acquisition device are integrated devices, the data acquisition device is positioned in the cavity, a partition part is arranged in the cavity, and the data acquisition device is separated from the piezoelectric film by the partition part.

6. The digital stethoscope system as defined in claim 1 wherein,

the data acquisition device comprises a voltage amplification module, a noise reduction module, an analog-to-digital conversion module, a microprocessor and a wireless communication module, wherein the electric signals are sequentially processed by the voltage amplification module, the noise reduction module, the analog-to-digital conversion module and the microprocessor;

7. The digital stethoscope system as defined in claim 6 wherein,

the voltage amplification module and the noise reduction module are configured to be able to match an output impedance of the piezoelectric film.

8. The digital stethoscope system as defined in claim 6 wherein,

the voltage amplification module is provided with a voltage stabilizing unit, and the noise reduction module is a low-pass filter and can adjust the cut-off frequency of the filter circuit.

9. The digital stethoscope system as defined in claim 6 wherein,

the data acquisition device also comprises a power management module and a battery, wherein the power management module receives electric input from the battery and performs voltage stabilization treatment on the electric input to supply power for the voltage amplification module, the analog-to-digital conversion module, the microprocessor and the wireless communication module.

10. The digital stethoscope system as defined in claim 9 wherein,

the power management module, the analog-to-digital conversion module and the microprocessor are integrated in a single chip microcomputer development board, and the single chip microcomputer development board is an Arduino UNO development board.

11. The digital stethoscope system as defined in claim 1 wherein,

the wireless connection mode of the mobile terminal and the data acquisition device is at least one selected from the following: wiFi, 4G, 5G, bluetooth, zigBee.

12. The digital stethoscope system as defined in claim 1 wherein,

the mobile terminal is provided with a button for enlarging or reducing the display range of the data size, and is provided with a data storage button.