CN111110270A

CN111110270A - Medical teaching multi-terminal synchronous Bluetooth stethoscope based on Android and control system thereof

Info

Publication number: CN111110270A
Application number: CN201911221232.9A
Authority: CN
Inventors: 陈文佳; 刘越; 郭庆峰; 傅羽
Original assignee: Harbin Medical University
Current assignee: Harbin Engineering University; Harbin Medical University
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-05-08

Abstract

The application provides synchronous bluetooth stethoscope in medical teaching multi-terminal based on Android and control system thereof, this stethoscope includes: pickup apparatus, button, OLED module, power module, CSR8675 module, anti-aliasing filtering and amplification module, CSR8675 module include MCU unit, DSP unit, ADC unit, DAC unit, bluetooth unit. The stethoscope that this application provided is small, has combined one-to-one and two kinds of modes many to one, has improved the SNR of signal through the filtering setting, has reduced signal distortion, and data transmission does not have the data packet loss phenomenon, and the real-time is high, and has the auscultation report of filling in real time and submits, look over functions such as online personnel in real time, and the auscultation quality is higher, and the teaching quality is better.

Description

Medical teaching multi-terminal synchronous Bluetooth stethoscope based on Android and control system thereof

Technical Field

The invention relates to the field of medical teaching equipment, in particular to an Android-based multi-terminal synchronous Bluetooth stethoscope for medical teaching and expert consultation and a control system thereof.

Background

The stethoscope is applied to the diagnostic tool that clinical doctor commonly used, and traditional stethoscope passes through the adapter and during transmission medium transmits analog signal to doctor's ear, along with the development of digital-to-analog conversion technique, the improvement of sampling rate and sampling precision, digital stethoscope turns into digital signal with analog signal and transmits, has reduced the signal distortion greatly, has made things convenient for the storage of signal. With the development of wireless technology, bluetooth transmission is also applied to stethoscopes as a stable short-distance transmission technology, and gets rid of the constraint of data lines, so that various bluetooth stethoscopes come into play and are widely applied clinically.

Part of the existing Bluetooth stethoscope is directly connected with an integrated Bluetooth stethoscope through a Bluetooth earphone, so that the traditional stethoscope is only replaced; and the other part of the auscultation system plays the advantages of digital signals, not only can real-time auscultation be realized, but also auscultation data are stored and sent to the cloud to establish a remote diagnosis system. However, most of these stethoscopes are only limited to one-to-one auscultation, and one-to-many auscultation situations in medical teaching or expert consultation can only adopt a method of off-line data storage and playing, which can also realize one-to-many auscultation, but lacks real-time auscultation, and especially in medical teaching, students have limited level, and cannot well grasp the correspondence between auscultation positions and auscultation information, which requires real-time auscultation. When a doctor auscultates and demonstrates, the optimal teaching effect can be achieved only by ensuring that the auscultation position seen visually is synchronous and consistent with the heard sound in real time.

Among them, the "a bluetooth stethoscope for medical teaching" (patent No. 201520344893.1) considers such a demand for medical teaching, and aims to build a one-to-many bluetooth stethoscope, but its knowledge of using method is to play out the output audio. The method has strict requirements on auscultation environment, needs to ensure the silence of the surrounding environment, and due to the extremely high amplification factor, the external audio frequency amplifies system noise and reduces the signal-to-noise ratio of auscultation signals; the Android-based intelligent electronic auscultation system (patent number 201610231579.1) also proposes the application of an Android platform in a Bluetooth stethoscope, but the patent focuses on the display, playing, storage and user management of waveforms in terms of Android application software, and does not consider the one-to-many real-time auscultation requirement in medical teaching.

In summary, the one-to-many real-time medical teaching auscultation system provided by the invention solves the problems, is designed by combining the latest technology on hardware and software, improves the performance of the system, finally improves the quality of auscultation teaching, and constructs a set of complete teaching auscultation system.

Disclosure of Invention

Based on the defects that the three problems cannot be fully considered by the traditional method, the three problems of multi-source InSAR monitoring time sequence splicing are comprehensively considered, and a systematic method suitable for large-range ground settlement time sequence splicing is provided. Specifically, the invention provides the following technical scheme:

on one hand, the invention provides a medical teaching multi-terminal synchronous Bluetooth stethoscope based on Android, which comprises:

the device comprises a pickup device, keys, an OLED module, a power supply module and a CSR8675 module, wherein the CSR8675 module comprises an MCU unit, a DSP unit, an ADC unit, a DAC unit and a Bluetooth unit;

the OLED module is connected with the MCU and used for displaying the acquisition state, the electric quantity and the volume;

the sound pickup device acquires a heart sound signal, converts the heart sound signal into a voltage signal, and conditions waveform voltage to a range capable of being acquired by the ADC unit before the voltage signal is acquired;

the ADC unit converts the received voltage signal into a digital signal and transmits the digital signal to the DSP unit for digital filtering;

and the filtered data filtered by the DSP unit is copied into two paths of data, wherein one path of data is converted into an analog signal through the DAC unit and is output, and the other path of data enters the Bluetooth unit.

Preferably, the stethoscope further comprises an anti-aliasing filtering and amplifying module, which is connected with the sound pickup device and the ADC unit;

the anti-aliasing filtering and amplifying module comprises an amplifying circuit unit and an anti-aliasing filter unit;

the amplifying circuit unit amplifies the audio signal from the sound pickup device and conditions the waveform voltage of the amplified audio signal into a range which can be collected by the ADC unit;

the anti-aliasing filter unit filters noise exceeding a sampling frequency to perform filtering.

Preferably, the CSR8675 module further includes a memory unit, a UART unit, an IIC unit, and a USB unit, and the CSR8675 module supports analog I/O and digital I/O interfaces.

Preferably, the CSR8675 module further comprises a power supply module, and the power supply module is a positive and negative voltage module formed by a TPS5430 chip.

On the other hand, the invention also provides a medical teaching multi-terminal synchronous Bluetooth stethoscope control system based on Android, which comprises the stethoscope, a teaching end and student ends, wherein the teaching end is connected with the stethoscope through Bluetooth, and distributes received audio data to one or more student ends through TCP connection;

after the system is started, the teaching terminal enters a user selection mode, wherein the user selection mode comprises a student mode and a teaching mode;

in the teaching mode, the system acquires a local area network IP address and displays the local area network IP address;

and the student mode requires inputting an IP address of a teaching end, and accordingly, local area network connection is established.

Preferably, in the student mode, the teaching end IP address is input, and a regular expression is used to limit the input range to the third type of private IP address.

Preferably, each student end is connected with the teaching end, and a public account is added in a linked list of the teaching end; and if the student end is abnormally disconnected from the teaching end, removing the corresponding connection object in the catch block.

Preferably, the teaching end has the functions of real-time auscultation, earphone listening, on-line student number checking, audio saving and checking and student end report receiving.

Preferably, the student terminal has the functions of real-time auscultation, earphone listening, listening to report recording, saving and viewing audio.

Compared with the prior art, the invention has the following beneficial effects: firstly, the invention develops around a CSR8675 module, greatly improves the integration level of hardware, enables the size of the Bluetooth stethoscope to be smaller, and enables the volume of a pickup part to be larger, thereby being beneficial to picking up heart sound signals; secondly, the audio data are divided into two paths, one path is directly output by a DAC, the other path is sent to an Android terminal, and the design method can enable the mobile phone to work independently of the Android mobile phone or work in combination with the Android mobile phone and combines a one-to-one mode and a one-to-many mode; thirdly, the anti-aliasing filter of the ADC is added, the cut-off frequency is set to be the Nyquist sampling frequency, and digital filtering is used, so that the signal-to-noise ratio of signals is improved, and the signal distortion is reduced; fourthly, the application program end of the invention uses the thread pool to establish TCP connection, compared with the UDP connection of multicast, the connection is more stable, the phenomenon of data packet loss does not exist, and noise can not be introduced into the student end; fifthly, the method relies on the wifi of the local area network, only passes through one routing node, and is high in communication speed and real-time performance; sixthly, the application program end fills and submits an auscultation report in real time according to the heard audio data; seventh, the teaching end of the application program can check the online personnel in real time, and the application program is applied to teaching without roll calling operation; eighth, the invention depends on the Android mobile phone, but the Android mobile phone is widely applied at present, almost one hand is used, when auscultation is carried out in one-to-many mode, students can wear earphones, interference of external environment noise is isolated, auscultation quality is higher, and teaching quality is better.

Drawings

Fig. 1 is a hardware configuration diagram of a medical teaching stethoscope according to an embodiment of the present invention;

FIG. 2 is a software start-up flowchart of a medical teaching stethoscope according to an embodiment of the present invention;

fig. 3 is a layout diagram of an Android UI interface of the medical teaching stethoscope according to the embodiment of the present invention.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

Example 1

In a specific embodiment, the stethoscope described herein can be implemented in the following preferred manner, and the hardware system of the stethoscope specifically includes a sound pickup device 1, an anti-aliasing filtering and amplifying module 5, a power supply module 2, a key 3, an OLED screen 4, a CSR8675 module 7, and an Android terminal 8. The front end of the pickup device 1 transmits an acoustic signal to the acoustoelectric sensor through the tympanic membrane, and the acoustic signal is further converted into a weak electric signal; the anti-aliasing filtering and amplifying module 5 comprises an amplifying circuit 5-1 and an anti-aliasing filter 5-2, an electric signal carrying audio information is further amplified by the amplifying circuit 5-1 and converted into a range suitable for ADC (analog to digital converter) acquisition, and the noise exceeding the sampling frequency is further filtered by the anti-aliasing filter 5-2, so that the influence of high-frequency noise on a real signal is prevented; the amplifying circuit 5-1 is mainly composed of an amplifier and a peripheral resistor, wherein the amplifier can be composed of an OPA1612 but is not limited to the type of amplifier. The anti-aliasing filter 5-2 can be composed of passive filtering or active filtering, wherein in the technical scheme of the application, in a preferred embodiment, the anti-aliasing filter 5-2 uses a seven-order active low-pass filter composed of an operational amplifier and ensures that the signal has maximum flatness and maximum attenuation at a cut-off frequency; further audio signals are transmitted into a CSR8675 module, analog signals are dispersed into digital signals through an ADC function, and further transmitted into a DSP for digital filtering, wherein the digital filtering is designed into a band-pass filter for filtering noise which is lower than or higher than the frequency of heart sounds, lung sounds and abdominal sounds; after further filtering is finished, copying the audio signal into two paths and giving gains, wherein one path carries out wireless Bluetooth transmission through RF radio frequency carried by a CSR8675 module 7, in a preferred embodiment of the invention, a Bluetooth high-quality audio transmission protocol A2DP is selected, wherein an SPP serial protocol can also meet transmission requirements, Android is connected with a Bluetooth module through reflection, and received data stream is converted into a wav format at an Android end and then can be analyzed and played; and the other path of audio signal is transmitted to the DAC module and converted into a left channel and a right channel which are connected with an external earphone for real-time playing. The further playing volume is adjusted by a key 3 and is communicated with the MCU through an IO port, and the MCU is further communicated with the DSP to change the signal output gain; and the further OLED screen is in data communication with the MCU through the IIC, so that user interaction is realized, and the working state and the electric quantity state of the stethoscope are displayed.

In a more preferred embodiment, the power module is composed of a lithium battery and a TPS5430, the lithium battery directly provides 5V power supply, the TPS5430 chip converts +5V voltage into-5V voltage to supply power to the amplifier, the lithium battery is large in capacity, the power supply is low in ripple, durable and stable power supply is provided, and interference to signals is avoided.

Example 2

In yet another specific embodiment of the present application, the present application may also implement its specific multi-terminal synchronization function in a systematic manner. The system may include the stethoscope according to embodiment 1, and includes a teaching end Android terminal, such as a mobile phone, and a student end, where the student end may be a mobile phone. The student side and the teaching side can be realized through Android-based APP, for example.

The Android application program end mainly realizes that the Android mobile phone of the teaching end acquires audio data of a hardware part through Bluetooth connection, multi-thread TCP connection is established with a thread pool opened by the student end, and the audio data are further distributed to each student end through the TCP connection. After the hardware system is started, a local area network is required to be connected and the Bluetooth is started before the Android application program runs, connection is established with the hardware system in the Bluetooth setting, and the application program further requires a user to select a mode (a student mode or a teaching mode) after being started. In the teaching mode, the system automatically acquires an IP address in a local area network Wifi and displays the IP address through a UI (user interface); in the student mode, the IP address of the server, namely the IP of the teaching end, is required to be input, and the local area network connection is established according to the address and used for receiving audio data. The IP address input in the student mode uses a regular expression to limit the input range to be a third-class private IP address. Each student end is connected with the teaching end, a public account is added in a linked list of the teaching end, when the student end exits, the occurrence data of the teaching end generates abnormity, and the connection is removed in the catch block. The teaching end has the functions of real-time auscultation, earphone listening, on-line checking of the number of students, storage of the checking audio and receiving of student reports; the student end has the functions of real-time auscultation, earphone listening, report recording listening and audio frequency saving and viewing.

In a specific implementation manner, the Android end of the embodiment of the present invention may be developed by using andriod studio 3.0 JAVA language, and the starting process of the application program is as shown in fig. 2, where when the application program is started, first, partial permissions of a network, file storage, and the like are obtained, then, a UI interface is initialized, and further, a local network state is obtained in an onCreate function initialized by the UI interface, whether an IP address is correct is detected by a regular expression, if no connection exists, network connection is prompted, and if the IP address is incorrect, local network connection is prompted. The further Android end is connected with the Bluetooth through reflection, if the connection is overtime, the Bluetooth connection is prompted to be checked, and if the Bluetooth connection is normal, the next step is carried out, and the working mode of the machine is selected. The application program integrates a student end and a teaching end into a software package, a user selects a working mode, after the selection mode is determined, a common initialization process in the two modes is executed firstly, data streams transmitted by Bluetooth connection threads are monitored, audio data are obtained, and then Audio track types are created to control and play audio in real time. Further, if the application program runs in a teaching mode, the application program starts a thread pool to wait for Socket connection, and when a student end requests connection, a new thread is created, objects are added into the generic linked list, and data are circularly distributed to the objects in the linked list; if the teaching terminal runs in the student mode, the IP address of the local area network of the teaching terminal is required to be input before normal work, and the address is displayed on a UI interface of the teaching terminal. And requesting to be connected with the teaching end according to the acquired address. Although the requirement of the UDP protocol of the local area network multicast on the performance of the teaching end is low, a serious packet loss phenomenon exists in the data transmission process, and a large amount of noise in audio is caused, so that the invention uses TCP to carry out stable transmission, but the number of the teaching end connected with the student end is not too large, and if the number is too large, the data distribution is slow, and the real-time performance is influenced. The invention is connected with 15 student terminals simultaneously, and has good transmission effect. Further, if a user disconnects the teaching end abnormally, the teaching end is caused to be abnormal when data is distributed, the connected object is directly removed in the catch block, meanwhile, the UI interface is updated, and the user is removed, so that the function of checking the number of online people in real time by the teaching end is realized.

The Android end UI interface is shown in the figure, the UI main interface consists of Tablayout and Fragment, wherein Tablayout icons are displayed at the bottom and respectively comprise four modules of auscultation, personnel, recording and help, and the auscultation Fragment is the main interface of the application program and is used for performing on-line real-time auscultation and performing auscultation recording filling; the personnel Fragment mainly displays online personnel in real time, and refreshes an interface in real time by using a timer; the recording page can be used for checking and playing historical records, recording can be selected in the real-time auscultation process, temporary data are converted into audio for storage when recording is completed, and the auscultation records are stored as recording documents, so that checking and reviewing are facilitated; the help Fragment provides help information for software operation and teaching material on medical auscultation. Further, the auscultation interface mainly comprises four boards of lung auscultation, heart auscultation, abdomen auscultation and artery auscultation, which respectively correspond to different special auscultation sounds and can perform audio identification and auscultation position selection functions. Other additional records are filled out at the interface, and further IP addresses are displayed at the interface. Further student information and patient information are filled in the interface and stored as documents for the convenience of correction of doctors.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a synchronous bluetooth stethoscope of medical teaching multi-terminal based on Android, its characterized in that, the stethoscope includes:

the pickup device acquires a heart sound signal and converts the heart sound signal into a voltage signal;

2. The stethoscope according to claim 1, further comprising an anti-aliasing filtering and amplifying module connected to the sound pickup device and the ADC unit;

3. The stethoscope according to claim 1, wherein said CSR8675 module further comprises a memory unit, a UART unit, an IIC unit, and a USB unit, and said CSR8675 module supports analog I/O and digital I/O interfaces.

4. The stethoscope of claim 1, wherein the CSR8675 module further comprises a power module, the power module comprising a positive and negative voltage module made up of TPS5430 chips.

5. A medical teaching multi-terminal synchronous Bluetooth stethoscope control system based on Android, the system comprising a stethoscope according to any one of claims 1 to 3, a teaching end and a student end, wherein the teaching end is connected with the stethoscope through Bluetooth, and distributes received audio data to one or more students through TCP connection;

6. The system of claim 5, wherein in the student mode, a teaching end IP address is input, and a regular expression is used to limit the input range to a third class of private IP addresses.

7. The system of claim 6, wherein each student terminal is connected to the teaching terminal, and a user is added to the linked list of the teaching terminal; and if the student end is abnormally disconnected from the teaching end, removing the corresponding connection object in the catch block.

8. The system of claim 5, wherein the teaching end has functions of real-time auscultation, earphone listening, on-line student number viewing, audio saving viewing, and student end report receiving.

9. The system of claim 5, wherein said student end has real-time auscultation, headphone listening, report recording, save viewing audio functions.