CN102920475A - Gastrointestinal sound monitor system - Google Patents

Abstract

The invention discloses a gastrointestinal sound monitoring system, comprising: a collection device for collecting the sounds of multiple gastrointestinal monitoring parts and sending them to a conversion device; a conversion device for collecting the sounds of multiple monitoring parts collected by the collection device The sounds are respectively converted into corresponding digital signals; the storage and display device is used to store and display the obtained multiple digital signals in real time; the identification and analysis device is used to identify and extract the multiple digital signals according to the threshold file respectively. The corresponding gastrointestinal sound signal is generated and analyzed, and the corresponding indicators are analyzed to solve the problems in the prior art that the automatic identification and analysis of the gastrointestinal sound signal cannot be realized, and the inability to synchronize multiple parts of the gastrointestinal tract problems of sound monitoring, recognition and analysis.

Description

A gastrointestinal sound monitoring system

technical field

Embodiments of the present invention relate to the field of medical machinery, in particular to a monitoring system for gastrointestinal sounds. the

Background technique

Gastrointestinal sounds are an important indicator of abdominal evaluation, and are of great help in the diagnosis of abdominal diseases and the evaluation of gastrointestinal motility. Because the commonly used auscultation site is in the right lower abdomen or around the umbilical cord, it is customarily called bowel sounds (bowel sounds). the

At present, the monitoring of clinical gastrointestinal sounds at home and abroad generally adopts a common stethoscope through manual auscultation. This method is greatly affected by the subjectivity of auscultation personnel, and the measurability and repeatability of auscultation results are poor, which reduces the reliability of gastrointestinal sound monitoring. Moreover, in the monitoring process of critically ill patients, it is necessary to perform auscultation at regular intervals. This repeated auscultation operation increases the workload of gastrointestinal sound monitoring. the

A gastrointestinal sound monitoring technology that has been disclosed - a multi-channel bowel sound acquisition system, includes multiple microphones for converting sound signals into electrical signals; a front-end processing circuit for filtering, amplifying and electrical signals Level up; A/D conversion device, used to convert the amplified, filtered and level up electrical signal into a digital signal; and a data transmission module, used to send the digital signal. the

Obviously, the multi-channel bowel sound collection system collects gastrointestinal sounds in multiple channels and converts the collected signals into digital signals for storage. However, the data stored in the system is digital signals, and the digital signals and It is difficult to judge the monitoring results, which can easily lead to a disconnection between the monitoring results and clinical judgment, which affects clinical application. the

Another disclosed prior art, the digital bowel sound monitoring system, uses a personal computer sound card and a self-made auscultation head to monitor single-site gastrointestinal sounds, and marks the gastrointestinal sound signals through manual recognition. , and the collected signals of the main indicators of gastrointestinal sound were counted and analyzed through manual operation. However, the system can only express the collected gastrointestinal sound signal through the waveform signal, and subsequent manual identification is required. and the selected gastrointestinal sound signal, and then manually analyze the gastrointestinal sound through computer batch calculation. the

All in all, the existing technologies that have been disclosed so far only realize the collection and recording functions of gastrointestinal sounds, and cannot automatically process, evaluate and monitor the results. Effectively obtain the monitoring results of gastrointestinal sounds and apply them in clinical diagnosis. the

Contents of the invention

The embodiment of the present invention provides a gastrointestinal sound monitoring system, which is used to solve the problems existing in the prior art that the automatic identification and analysis of gastrointestinal sound signals cannot be realized, and the synchronous gastrointestinal sound monitoring, identification and analysis of multiple parts cannot be performed. question. the

An embodiment of the present invention provides a gastrointestinal sound monitoring system, including:

The collection device is used to collect the sounds of multiple gastrointestinal monitoring parts and send them to the conversion device;

The conversion device is used to convert the sounds of multiple monitoring parts collected by the collection device into corresponding digital signals;

Storage and display means for storing and displaying multiple digital signals obtained in real time;

The recognition and analysis device is used to respectively recognize a plurality of digital signals according to the threshold file, extract corresponding gastrointestinal sound signals, analyze them, and analyze corresponding indexes. the

An embodiment of the present invention provides a gastrointestinal sound monitoring system, which adopts a collection device that can simultaneously collect sounds from multiple gastrointestinal monitoring parts, and realizes automatic identification of multiple gastrointestinal sound signals and multiple gastrointestinal sound signals Automatic analysis of various indicators. the

Description of drawings

Fig. 1 is the schematic diagram of the gastrointestinal sound detection system in the embodiment of the present invention;

Fig. 2 is the structural representation of the acquisition device in the embodiment of the present invention;

Fig. 3 is the conversion device schematic diagram in the embodiment of the present invention;

Fig. 4 is the filter device schematic diagram in the embodiment of the present invention;

Fig. 5 is the schematic diagram of identification and analysis device in the embodiment of the present invention;

Fig. 6 is a schematic diagram of an analysis module in an embodiment of the present invention. the

Detailed ways

The embodiment of the present invention provides a gastrointestinal sound monitoring system, which can simultaneously collect the sounds of multiple gastrointestinal monitoring parts, and realize the automatic identification of multiple gastrointestinal sound signals and the identification of various indicators of multiple gastrointestinal sound signals Automatic analysis. the

The embodiment of the present invention is illustrated below in conjunction with accompanying drawing:

As shown in Figure 1, the embodiment of the present invention designs a kind of gastrointestinal sound monitoring system, comprises:

The collection device 101 is used to collect the sounds of multiple gastrointestinal monitoring parts and send them to the conversion device 102;

The conversion device 102 is used to convert the sounds of a plurality of monitoring positions collected by the collection device 101 into corresponding digital signals respectively;

Storage and display device 103, used for storage and real-time display of multiple digital signals obtained;

The recognition and analysis device 104 is used to respectively recognize the obtained multiple digital signals according to the threshold file, extract and analyze corresponding gastrointestinal sound signals, and analyze corresponding indexes. the

The structure of the acquisition device designed in the embodiment of the present invention is shown in FIG. 2 , which includes a plurality of acquisition modules 201, and each acquisition module 201 corresponds to a gastrointestinal monitoring site. the

Each acquisition module in the acquisition device includes:

Connecting tube 203, for connecting auscultation head 202 and miniature loudspeaker 204;

The auscultation head 202 is used to collect the sound of the corresponding gastrointestinal monitoring site, and transmit it to the miniature loudspeaker 204 through the connecting tube 203;

The micro-speaker 204 is used to physically amplify the sound of the corresponding gastrointestinal monitoring site and then transmit it to the conversion module, wherein the micro-speaker 204 is fully enclosed in the connecting tube 203 . the

In practical application, the embodiment of the present invention can use the 3M Littmann professional auscultation head of model 214L designed for the characteristics of the auscultation signal, which can better reduce the entry of interfering sounds during data collection, and this type of professional auscultation head passes through its internal The physical structure improves the magnification of the gastrointestinal sound signal, shortens the length of the connecting tube to 10cm to reduce the interference sound caused by the friction between the connecting tube and the surrounding objects during auscultation, and places the miniature loudspeaker fully closed Into the connecting pipe to reduce the interference of external environmental noise on the collected data. the

The structural diagram of the conversion device designed in the embodiment of the present invention is shown in FIG. 3 , which includes a signal processing module 301 and a signal conversion module 302 . the

The signal processing module 301 includes a plurality of signal processing chips 303, and each signal processing chip 303 obtains the sound of a gastrointestinal monitoring site transmitted by the acquisition module, converts it into a corresponding audio signal, performs step-by-step amplification, and passes the signal processing The low-pass filter inside the chip 303 filters out part of the mechanical noise, and then stores the filtered audio signal into the signal conversion module 302;

Signal conversion module 302, including a plurality of DSP (digital signal processor, digital signal microprocessor) 304, a DSP corresponds to a signal processing chip, each DSP is used to convert the audio signal after the corresponding signal processing chip 303 filter into a corresponding The digital signal is sent to the storage and display device. the

In practical applications, the conversion device can use multiple easy5509 development boards including TLV320AIC23 and TMS320C5590A DSP. Among them, the signal processing chip in the signal processing module can use TLV320AIC23, and the DSP in the signal conversion module can use TMS320C5509ADSP. In the embodiment of the present invention, the audio signal can be amplified by 24 decibels through the TLV320AIC23. TMS320C5509A DSP can send the corresponding digital signal to the storage and display device through the USB channel. The storage and display device can convert the digital signal into a wave form and display it on the display screen. the

The system in the embodiment of the present invention also includes a filtering device, which is used to filter the multiple digital signals converted by the above conversion device and then input them to the storage and display device, including a bandpass filter 401 and a wavelet filtering module 402, as shown in Figure 4 Show. the

The band-pass filter 401 is used to perform band-pass filtering on the multiple digital signals converted by the converting device, to remove interference signals with large amplitude and irregular fluctuations in the waveform. the

In practical applications, since the frequency of gastrointestinal sounds is mainly concentrated between 60 and 1500 Hz, the embodiment of the present invention can use the FIR bandpass filter designed based on the window function design method to filter out frequencies other than 60 to 1500 Hz. signal, and display the waveform corresponding to the filtering result through the storage and display device. The FIR band-pass filter can use Kaiser window design to filter the digital signal, its sampling frequency can be fs=8000Hz, the cut-off frequency of the lower limit of the passband can be fc1=60Hz, the cutoff frequency of the upper limit of the passband can be fc2=1500Hz, and the transition The bandwidth can be 20Hz, and the pass-stop band fluctuation can be 0.01. the

The band-pass filter 401 removes the signals with large amplitude and irregular fluctuations that are common in the digital signal before filtering, and better maintains the original characteristics of the gastrointestinal sound waveform, but there are still many fluctuations near zero Small, low-energy interference waves, therefore, the band-pass filtered signal needs to be input into the wavelet filter module. the

The wavelet filtering module 402 is configured to perform secondary filtering on the band-pass filtered signal, and filter out signals below the threshold. The wavelet filtering module uses the wavelet algorithm suitable for weak and non-stationary signal filtering to perform secondary filtering on the signal after bandpass filtering. Specifically, the symlet wavelet algorithm with N=4 and 5 decomposition levels can be selected to process the signal Perform secondary filtering to remove small, low-energy interference waves that fluctuate near the zero point. the

The identification and analysis device designed in the embodiment of the present invention is used to remove the interference signal in the digital signal through a self-defined threshold, and obtain the gastrointestinal sound signal according to the threshold value file, and mark the gastrointestinal sound signal in red in the waveform displayed on the screen. Its structure is as follows As shown in Figure 5, including threshold value establishment module 501, identification module 502 and analysis module 503.

The threshold establishment module 501 is used to extract common features from multiple groups of gastrointestinal sound signals extracted before through multi-dimensional feature vector extraction and vector normalization, determine the feature threshold of gastrointestinal sound, and establish and save the threshold file. the

In practical application, the embodiment of the present invention first obtains the original signal through the acquisition device, conversion device, and storage and display device in the gastrointestinal sound monitoring system, and then the threshold value establishment module can use a chip with specific functions to analyze the previously extracted multiple groups The original signal of a person who has reached the healthy standard is compared with the sound and waveform, and the gastrointestinal sound waveform with a duration greater than 10ms (milliseconds) and a maximum amplitude greater than 2000 is selected, and multiple groups of normal sounds are extracted through multidimensional feature vector extraction and vector normalization processing. The common feature of the gastrointestinal sound waveform, determine the characteristic threshold of the gastrointestinal sound, establish the threshold value file, and save it in the memory. the

The identification module 502 is used for the chip with specific functions to extract corresponding gastrointestinal sound signals from multiple digital signals according to the threshold file, and highlight the waveforms of the extracted gastrointestinal sound signals through the storage and display device. Specifically, the identification module 502 may acquire digital files storing multiple digital signals after secondary filtering from the storage and display device, and compare and analyze the acquired data files according to the threshold file obtained by the threshold establishment module, and identify Gastrointestinal sound signal is detected, and the waveform of the recognized gastrointestinal sound signal is marked in red. the

The analysis module 503 analyzes each gastrointestinal sound signal through a chip with a specific function, parses out and saves various indicators of each gastrointestinal sound signal, as shown in Figure 6, including:

The first sub-module 601 is used to analyze each gastrointestinal sound signal, and analyze the number of gastrointestinal sound waves within the preset collection time;

The second sub-module 602 is used to analyze each gastrointestinal sound signal, and resolve the maximum and minimum values of the duration of the gastrointestinal sound wave, the maximum frequency and the minimum frequency of the gastrointestinal sound wave within the preset acquisition time;

The third sub-module 603 is used to analyze each gastrointestinal sound signal, and resolve the average value of the duration of all gastrointestinal sound waves within the preset acquisition time;

The fourth sub-module 604 is configured to analyze each gastrointestinal sound signal, and analyze the average frequency and average power of all gastrointestinal sound waves within a preset collection time. the

In practical applications, in order to make the analysis results of gastrointestinal sound signals more consistent with the current manual auscultation widely used in clinical practice, the adjacent sound points in the gastrointestinal sound signals whose interval time is within 400ms from the stop point to the sound point can be Two or more waveforms are recorded as a series of gastrointestinal sound waves, and the indicators of the series of gastrointestinal sound waves obtained by the device of the embodiment of the present invention are as follows:

The number of bowel sound waves in a series (the unit is: piece/minute, cpm): the number N of gastrointestinal sound waves per unit time;

Percentage of the time of a series of bowel sounds (unit: %): the sum of the occupied time of gastrointestinal sound waves T _M per unit time, divided by the detection time T ₁ and multiplied by 100%, that is, T _M /T ₁ *100 %;

The average time of a series of bowel sound waves (unit: ms): the sum of the occupied time of gastrointestinal sound waves per unit time T _M /the number of gastrointestinal sounds N, that is, T _M /N;

The power of a series of bowel sounds (unit: w): the sum of the squares of the amplitudes of all bowel sounds per unit time. the

In order to ensure the accuracy of collection, storage, and real-time dynamic display of gastrointestinal sound signals, the gastrointestinal sound monitoring system of the embodiment of the present invention adopts a multi-thread processing method, and one thread is called an acquisition thread, which is responsible for signal acquisition and storage, and The sampling frequency of 8KHz collects audio signals, and stores data according to the encoding method of high byte and low byte (LittleEndian); another thread is called display thread, which is responsible for real-time display of signal data, according to the preset display Scale, sample the collected data to extract key points, and connect the key points to form the corresponding waveform. There is a message synchronization mechanism between the above-mentioned multi-threads. The acquisition thread notifies the display thread to update the signal data displayed on the display screen before the data buffer overflows. After the display thread finishes displaying, it will immediately notify the acquisition thread to clear the buffer in order to store the newly acquired signal. data. The advantage of this processing method is that it can accurately collect and display signal data without missing signal data due to resource preemption. the

The embodiment of the present invention provides a gastrointestinal sound monitoring system, which can collect the sounds of multiple gastrointestinal monitoring parts at the same time after the acquisition device is improved, and realizes automatic identification of gastrointestinal sound signals and various indicators of gastrointestinal sound signals automatic analysis. the

Specifically, the automated gastrointestinal sound monitoring system designed in the embodiment of the present invention is capable of real-time, dynamic, and continuous recording of gastrointestinal sounds, and can automatically identify short-duration, Gastrointestinal sound signals with low energy and difficult to be accurately recognized by the human ear can quantify, accurately calculate and compare gastrointestinal sound waveform characteristic parameters such as the duration, sound frequency and power of a single gastrointestinal sound waveform, thereby Provide more objective, accurate, comprehensive and replayable results, and because the system can easily realize continuous monitoring and analysis of gastrointestinal sounds, detect changes in the condition in time, reduce the operation steps and time of medical staff, and improve the work of medical staff It is more feasible and practical for gastrointestinal sound monitoring in critically ill patients, and it is also conducive to the establishment of a unified and measurable standard for clinical gastrointestinal sound monitoring. the

The present invention is described with reference to flowchart illustrations and/or block diagrams of apparatuses and systems, and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and combinations of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a Means for realizing the functions specified in one or more steps of the flowchart and/or one or more blocks of the block diagram. the

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram. the

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart flow or flows and/or block diagram block or blocks. the

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention. the

Apparently, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. In this way, if the modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention also intends to include these modifications and variations. the

Claims (8)

1. a gastrointestinal sound monitoring system is characterized in that, comprising:

Harvester is used for gathering the sound at a plurality of gastrointestinal monitorings position, and is sent in the reforming unit;

Reforming unit is used for the sound at a plurality of monitorings position of harvester collection is separately converted to corresponding digital signal;

Storage and display device are used for storage and show in real time a plurality of digital signals that obtain;

The identification and analysis device is used for according to threshold file described a plurality of digital signals being identified respectively, extracts corresponding gastrointestinal sound signal, and analyzes, and parses corresponding indices.

2. the system as claimed in claim 1 is characterized in that, described harvester further comprises a plurality of acquisition modules, the corresponding gastrointestinal monitoring of each acquisition module position, and wherein, each acquisition module comprises:

Connection tube is used for connecting auscultation head and mini-loud hailer;

Auscultation head is used for gathering the sound that corresponding gastrointestinal is monitored the position, and transfers to mini-loud hailer by connection tube;

Mini-loud hailer is used for sound with the gastrointestinal monitoring position of correspondence and carries out transferring to described conversion module after physics amplifies, and wherein, this mini-loud hailer totally enclosed type is inserted described connection tube.

3. system as claimed in claim 2 is characterized in that, the length of described connection tube is 10cm, and the model of described auscultation head is the 3M Littmann auscultation head of 214L.

4. the system as claimed in claim 1 is characterized in that, described reforming unit further comprises:

Signal processing module comprises a plurality of signal processing chips, and wherein, the corresponding gastrointestinal monitoring of each signal processing chip position for the audio signal that the sound at corresponding monitoring position is converted into a correspondence, is amplified step by step, and carried out filtering;

The signal conversion module, comprise a plurality of digital signal microprocessor DSP, the corresponding signal processing chip of DSP, each DSP is used for the filtered audio signal of the signal processing chip of correspondence is converted into corresponding digital signal, and sends to described storage and display device.

5. the system as claimed in claim 1 is characterized in that, described identification and analysis device further comprises:

Threshold value is set up module, and the many groups gastrointestinal sound signal that is used for extracting extracts and vectorial normalized by multidimensional characteristic vectors, extracts common trait, determines the gastrointestinal sound characteristic threshold value, sets up and preserve threshold file;

Identification module is used for extracting respectively corresponding gastrointestinal sound signal according to threshold file from a plurality of digital signals, and highlights by described storage and the display device waveform with the gastrointestinal sound signal that extracts;

Analysis module is used for each gastrointestinal sound signal is analyzed, and parses and preserve the indices of each gastrointestinal sound signal.

6. system as claimed in claim 5 is characterized in that, described analysis module further comprises:

The first submodule is used for each gastrointestinal sound signal is analyzed, and parses the gastrointestinal sound wave number amount in default acquisition time;

The second submodule is used for each gastrointestinal sound signal is analyzed, and parses maximum and the minima of the persistent period of gastrointestinal sound wave in default acquisition time, the peak frequency of gastrointestinal sound wave and minimum frequency;

The 3rd submodule is used for each gastrointestinal sound signal is analyzed, and parses the meansigma methods of the persistent period of all gastrointestinal sound waves in default acquisition time;

The 4th submodule is used for each gastrointestinal sound signal is analyzed, and parses all gastrointestinal sound wave frequency meansigma methods and power average value in default acquisition time.

7. such as each the described system in the claim 1 ~ 6, it is characterized in that, also comprise:

Filter is used for a plurality of digital signals that described reforming unit transforms are carried out respectively filtering, and filtered a plurality of digital signals are inputted described storage and display device.

8. system as claimed in claim 7 is characterized in that, described filter further comprises:

Band filter is used for a plurality of digital signals that described reforming unit transforms are carried out respectively bandpass filtering, remove in the waveform wherein exist significantly, the interfering signal of random fluctuation;

The wavelet filtering module is used for the signal behind the bandpass filtering is carried out secondary filtering, will wherein be lower than the target signal filter of threshold value, and inputs described storage and display device.

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