WO2011013881A1

WO2011013881A1 - Portable digital esophageal stethoscope system and method for checking condition of patient using same

Info

Publication number: WO2011013881A1
Application number: PCT/KR2009/007021
Authority: WO
Inventors: 이태수; 임승운; 홍주현; 신지윤
Original assignee: 충북대학교 산학협력단
Priority date: 2009-07-31
Filing date: 2009-11-26
Publication date: 2011-02-03

Abstract

The present invention relates to a portable digital esophageal stethoscope system and a method for checking the condition of a patient using the same, and particularly to a portable digital esophageal stethoscope system enabling the numerical expression and quantification of the waveform of heart sounds, and a method for checking the condition of a patient using the same. The present invention provides a portable digital esophageal stethoscope system comprising a digital esophageal stethoscope which is inserted into the esophagus of a patient, senses a heart sound signal and a body temperature signal, detects a heart rate and a respiratory signal from the heart sound signal, analyzes the respiration rate obtained from the heart rate and the respiratory signal, and transmits information from the monitoring of the heart according to a certain communication mode; and a portable terminal which receives the above information from the monitoring of the heart according to the above communication mode, and numerically expresses and quantifies the body temperature, the heart rate and the respiration rate, together with heart abnormalities. The present invention also provides a method for checking the condition of a patient using the portable digital esophageal stethoscope system.

Description

Portable Digital Esophageal Stethoscope System and Patient Condition Detection Method Using the Same

The present invention relates to a portable digital esophageal stethoscope system and a method for detecting a patient's condition using the same, and more particularly, to a portable digital esophageal stethoscope system and a patient's condition detecting method using the same for quantifying and quantifying a waveform of a heart sound.

In general, the heart sound (heart sound) refers to the vibration or sound caused by the sudden acceleration and deceleration of the blood, mainly due to the opening and closing of the heart valve or the sudden tension of the intracardiac structure.

These heart diseases are medical accidents that can occur during surgery, and the anesthesia department uses an esophageal stethoscope to immediately know the patient's condition in the event of a heart disease accident during surgery.

Esophageal stethoscopes are used during surgery in anesthesiology departments to immediately identify the patient's condition during anesthesia. Because of the development of medical devices, all vital signs can be identified through patient monitoring during or after surgery, so anesthesiologists also believe that anesthesia patients need to know the heart condition of anesthetized patients as soon as possible. .

However, the conventional esophageal stethoscope has a problem that it is difficult to quantitatively evaluate the cardiac activity that may occur during or after surgery because the doctor must monitor the patient's condition while listening to the heart through the stethoscope.

That is, in order to grasp the patient's condition while listening to the heart during surgery, the patient can hear the heart only at the moment of auscultation, and only the doctor who listens to the heart has the problem of identifying the patient's condition according to the patient's subjective heart sound. . In addition, there is a problem that the doctor can not hear the heart accurately because of the operation.

In addition, since the doctor must rely only on the results of listening to the doctor's heart sounds, there is a big problem that a medical accident can be directly related to the patient's life.

The present invention has been made in view of the above problems, and provides a portable digital esophageal stethoscope system and a patient condition detection method using the same to prevent medical accidents that may occur during surgery by numerically and quantifying the waveform of the heart sound. There is a purpose.

Another object of the present invention is to extract a heart rate and respiratory signal from the heart sound information obtained by inserting a digital esophageal stethoscope into the patient's esophagus, and to display the abnormality of cardiac activity through the portable terminal using the information about the portable digital An esophageal stethoscope system and a method for detecting a patient's condition using the same are provided.

Still another object of the present invention is to provide a portable digital esophageal stethoscope system and a patient state detection using the portable digital esophageal stethoscope to quantify and quantify the detected heart rate and respiratory rate and to display the resulting data through a low-end portable terminal. In providing a method.

The objects of the present invention are not limited to the above-mentioned objects, and other objects which are not mentioned will be clearly understood by those skilled in the art from the following description.

Portable digital esophageal stethoscope system according to an aspect of the present invention for achieving the above object, in the portable digital esophageal stethoscope system, is inserted into the esophagus of the patient, detects the heart sound signal and body temperature signal, heart rate from the heart sound signal A digital esophageal stethoscope for detecting a respiratory signal and transmitting heart observation information according to a specific communication method by analyzing a heart rate and a respiratory rate obtained from the respiratory signal; And a portable terminal that receives the cardiac observation information according to the specific communication method and displays the measured and quantified heart size, body temperature, heart rate, and respiratory rate along with whether the heart is abnormal.

Here, the digital esophageal stethoscope, the sensor unit for detecting the heart sound and body temperature of the patient outputs the sound signal and the body temperature signal; A signal preprocessing unit pre-amplifying the heart sound signal and the body temperature signal from the sensor unit and pre-amplifying the sound signal and stabilizing the level of the heart sound signal and the body temperature signal by removing high frequency noise; A filter unit for filtering the stabilized heart sound signal and the body temperature signal for a frequency band of a specific band and outputting a heart sound signal and a body temperature signal for observing a heart rate and a respiration signal; The filtered heart sound signal and the body temperature signal are converted into digital heart sound information and body temperature information, the first derivative of the converted heart sound information is stabilized to stabilize the baseline of the heart sound information, and the heart rate is detected. A control unit which applies a filter to a moving average of 250 samples to detect a respiration signal, and analyzes the intensity and waveform of the heart sound to determine whether there is an abnormality of the heart, and to obtain corresponding cardiac observation information; And a communication unit transmitting the cardiac observation information to the portable terminal according to the specific communication method.

Here, the sensor unit, the temperature sensor for sensing the body temperature of the patient from the esophagus and outputs a body temperature signal; And a microphone sensor which detects a patient's heart sound and outputs a heart sound signal.

Here, the controller receives the pseudo unique ID and PW inputted from the portable terminal through the communication unit, and if the received pseudo unique ID and PW match with the pre-stored pseudo unique ID and PW, the corresponding heart observation information is requested. Send body temperature information to the portable terminal.

Here, the controller detects the heart rate using Equation 1 below.

(Equation 1)

HR = ((Sn-Sn 'Interval) / Sampling Rate) * 60 / min

Here, HR is a heart rate, Sn is a start point of a specific sound for a specific period of the heart sound signal, Sn 'means a start point of a specific sound of the next period of Sn.

Here, the control unit detects the respiratory rate by calculating the respiratory signal by applying the acquired heart sound signal to the moving average twice or more for a specific time.

The apparatus may further include a memory in which patient information, observation date, and cardiac observation information are stored in correspondence with each other according to the patient under the control of the controller.

A portable digital esophageal stethoscope system according to another aspect of the present invention, in the portable digital esophageal stethoscope system, is inserted into the esophagus of the patient, detects the heart sound signal and the body temperature signal, the heart sound signal and the body temperature signal in a specific band frequency band A digital esophageal stethoscope for transmitting a heart sound signal and a body temperature signal for filtering a heart rate and respiration signal by a specific communication method; And receiving the heartbeat signal and the body temperature signal by the specific communication method to detect the heart rate and the breathing signal from the heartbeat signal, and using the heart observation information obtained by analyzing the breathing rate obtained from the heart rate and the breathing signal. It includes a portable terminal including a portable terminal for displaying the quantitative and quantitative display of the size, body temperature, heart rate and respiratory rate of the heart sound with the abnormality.

Here, the digital esophageal stethoscope, the sensor unit for detecting the heart sound and body temperature of the patient outputs the sound signal and the body temperature signal; A signal preprocessing unit pre-amplifying the heart sound signal and the body temperature signal, and stabilizing levels of the heart sound signal and the body temperature signal by removing high frequency noise; A filter unit for filtering the stabilized heart sound signal and the body temperature signal for a frequency band of a specific band and outputting a heart sound signal and a body temperature signal for observing a heart rate and a respiration signal; And a communication unit transmitting the filtered heart sound signal and the body temperature signal according to a specific communication method.

Here, the portable terminal, the communication unit for receiving the heart sound signal and the body temperature signal in accordance with the specific communication method; The received heart sound signal and the body temperature signal are converted into digital heart sound information and body temperature information, and the converted heart sound information is firstly differentiated to stabilize the baseline of the heart sound information to detect the heart rate, and then convert the converted heart sound information into a moving average. A control unit which applies a filter to a moving average of 250 samples to detect a respiratory signal, and analyzes the intensity and waveform of the heart sound to determine whether the heart is abnormal and to obtain corresponding cardiac observation information; And a display unit displaying cardiac observation information under the control of the controller.

The portable digital esophageal stethoscope system according to another aspect of the present invention, in the portable digital esophageal stethoscope system, is inserted into the esophagus of the patient, detects the heart sound signal and body temperature signal, detects the breathing signal from the heart sound signal to the heart sound A digital esophagus stethoscope for transmitting signals, respiration signals, and body temperature signals by a specific communication method; And detecting the respiratory rate from the respiratory signal received by the specific communication method, detecting the heart rate from the heart sound signal received by the communication method, and using the heart observation information obtained by analyzing the heart rate and the respiratory rate. It includes a portable terminal for displaying the number and quantification of the size, body temperature, heart rate and respiratory rate of the heart sound.

Here, the digital esophageal stethoscope, the sensor unit for detecting the heart sound and body temperature of the patient outputs the sound signal and the body temperature signal; A signal preprocessing unit pre-amplifying the heart sound signal and the body temperature signal, and stabilizing levels of the heart sound signal and the body temperature signal by removing high frequency noise; A filter unit for filtering the stabilized heart sound signal and the body temperature signal for a frequency band of a specific band and outputting a heart sound signal and a body temperature signal for observing a heart rate and a respiration signal; A controller for converting the filtered heart sound signal and body temperature signal into digital heart sound information and body temperature information, and applying the converted heart sound information to a moving average filter to move average of 250 samples to detect a respiration signal; And a communication unit for transmitting the filtered heart sound signal, the detected breathing signal, and the body temperature signal to the portable terminal according to a specific communication method.

The portable terminal may include a communication unit configured to receive a heart sound signal, a respiration signal, and a body temperature signal according to a specific communication method; By converting the heart sound signal, respiration signal and body temperature signal to digital, the first derivative of the digital sound heart information is stabilized to stabilize the baseline of the heart sound information to detect the heart rate, and the respiratory rate is detected by the digitally converted breath signal. A controller configured to obtain cardiac observation information after analyzing the strength and waveform of the sound, the heart rate, the respiratory rate, and the frequency; And a display unit displaying cardiac observation information under the control of the controller.

According to another aspect of the present invention, a method for detecting a patient state using a portable digital esophageal stethoscope system, the portable digital esophageal stethoscope detects the body temperature and the heart sound of the patient, and easy heart rate detection and respiration signal detection from the detected heart sound signal Filtering at a specific frequency band and simultaneously amplifying a certain level; Detecting a heart rate by firstly differenting the digitally converted heart sound information with respect to the filtered and amplified heart sound signal by measuring a distance between a start point of a specific sound Sn and a start point of a specific sound Sn 'of a next period; Detecting a respiratory signal by applying a moving average of the digital sound heart information, which has been digitally converted, to the filtered and amplified heart sound signal two or more times during a specific time; Transmitting cardiac observation information on which the strength and waveform of the heart sound, heart rate, respiration, and frequency analysis are performed on the detected heart rate and respiration signal to a portable terminal based on a specific communication method; And displaying, by the portable terminal, the temperature of the patient along with the abnormality of the heart by numerical value and quantification using the cardiac observation information.

In the detecting of the heart rate, the heart rate is detected using Equation 3 below.

(Equation 3)

HR = ((Sn-Sn 'Interval) / Sampling Rate) * 60 / min

Here, in the detecting of the respiratory signal, the respiratory signal is detected by calculating the respiratory signal by applying the acquired heart sound signal two or more moving averages for a specific time.

Patient condition detection method using a portable digital esophageal stethoscope system according to another aspect of the present invention, the portable digital esophagus stethoscope for easy heart rate detection and respiratory signal detection from the heart sound signal obtained by detecting the body temperature and heart sounds of the patient Filtering a specific frequency band and simultaneously amplifying a predetermined level and transmitting the same to a portable terminal according to a specific communication method; The portable terminal firstly differentiates the heart sound information digitally converted with respect to the filtering and the amplified heart sound signal received according to a specific communication method, and starts the specific sound Sn and the specific sound Sn 'in the next period. Detecting a heart rate by measuring an interval between start points; Detecting a respiratory signal by applying a moving average of the digital sound heart information, which has been digitally converted, to the filtered and amplified heart sound signal two or more times during a specific time; And displaying the body temperature of the patient along with the abnormality of the heart by numerically and quantifying the detected heart rate and the respiratory signal using cardiac observation information on the strength and waveform of the heart sound, heart rate, respiration, and frequency analysis. Include.

According to another aspect of the present invention, a method for detecting a patient state using a portable digital esophageal stethoscope system, the portable digital esophageal stethoscope detects the body temperature and the heart sound of the patient, and easy heart rate detection and respiration signal detection from the detected heart sound signal Filtering at a specific frequency band and simultaneously amplifying a certain level; Transmitting the heartbeat information, which is digitally converted to the filtered and amplified heartbeat signal, to the portable terminal according to a specific communication method and detecting the detected breathing signal and the heartbeat signal by applying a moving average two or more times during a specific time; The portable terminal receives the heart sound signal and the breathing signal according to the specific communication method and firstly differentiates the heart sound information digitally converted into a specific sound (Sn) starting point and the interval between the start point of the specific sound (Sn ') of the next period. Detecting the heart rate by measuring the heart rate; And the abnormality of the numerical value and the quantified heart using cardiac observation information obtained by performing the analysis of intensity and waveform, heart rate, respiratory rate and frequency of heart sound after detecting the respiratory rate by digitally converting the received respiratory signal. Displaying the temperature of the patient.

The present invention, through the use of more diverse data (heart strength, heart rate, respiration, body temperature, frequency analysis) than the conventional esophageal stethoscope used by the operator (doctor) is numerically and quantitatively whether the patient's heart is normal during and after surgery By allowing the cardiac activity to be observed, the doctor can operate the patient safely, and the patient can trust the doctor to perform the operation, thereby increasing the reliability of the patient and the doctor.

In addition, there is an effect that can prevent medical accidents caused by abnormal cardiac activity in the situation that the confirmation of abnormalities of the heart sound information is not made properly.

1 is an exemplary view for explaining a schematic operation of a portable digital esophageal stethoscope system according to an embodiment of the present invention.

2 is a waveform diagram for explaining heart rate detection according to the present invention;

3 is a block diagram of a portable digital esophageal stethoscope system according to an embodiment of the present invention.

4 is an exemplary diagram for explaining screen data of heart state information displayed through a portable terminal according to an embodiment of the present invention.

Figure 5 is a flow chart showing a patient state detection method using a portable digital esophageal stethoscope system according to another embodiment of the present invention.

Figure 6 is a block diagram of a portable digital esophageal stethoscope system according to another embodiment of the present invention.

7 is a flow chart illustrating a patient state detection method using a portable digital esophageal stethoscope system according to another embodiment of the present invention.

8 is a block diagram showing a portable digital esophageal stethoscope system according to another embodiment of the present invention.

Figure 9 is a flow chart showing a patient state detection method using a portable digital esophageal stethoscope system according to another embodiment of the present invention.

10 is a block diagram showing a portable digital esophageal stethoscope system according to another embodiment of the present invention.

11 is a flow chart showing a patient state detection method using a portable digital esophageal stethoscope system according to another embodiment of the present invention.

The portable digital esophageal stethoscope system of the present invention detects and acquires a heart sound signal and a body temperature signal of a patient in order to quantify and quantify changes in body temperature and heart sound of a patient, and detects a heart rate and a respiratory signal from the acquired heart sound signals. We propose a technical configuration to display the numerical value and quantification of abnormality.

In the following description, specific details of the portable digital esophageal stethoscope system of the present invention and a method for detecting a patient's condition using the same are shown to provide a more general understanding of the present invention, and without these specific details the present invention may also be modified by these modifications. It will be apparent to those skilled in the art that the present invention may be readily implemented.

In the following description, the specific communication method between the portable digital esophageal stethoscope and the portable terminal may be either wireless or wired communication. In the present invention, a wireless communication method may be preferable. In the wireless communication method, a signal (data) to be transmitted based on a specific communication method in a portable digital esophageal stethoscope is analog-modulated and transmitted to a portable terminal, and the modulated analog signal ( Data is demodulated in a portable terminal for processing. It should be noted that the portable digital esophagus stethoscope and the communication unit provided in the portable terminal perform this operation.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail, focusing on the parts necessary to understand the operation and action according to the present invention.

Referring to FIG. 1, the present invention uses a portable digital esophageal stethoscope system 100 to insert a temperature sensor and a microphone sensor in a patient's esophagus to check for abnormalities in cardiac activity. Here, the temperature sensor obtains the body temperature of the patient through the esophagus, and the microphone sensor acquires the heart sound through the esophagus.

That is, the portable digital esophageal stethoscope system 100 inserts two sensors, a temperature sensor and a microphone sensor, into the catheter and outputs a body temperature signal and a heart sound signal corresponding to the detected body temperature and heart sound.

Thereafter, in order to remove noise of the body temperature signal and the heart sound signal, filtering and amplifying to a predetermined level to pass a predetermined frequency band are performed.

The signal obtained through the above-described process is input to a control unit which is a microcontroller. In this case, the filter and the amplified signal are analog signals, and when they are input to the controller, they should be converted and applied in analog / digital mode.

The control unit detects the heart rate and the respiration signal from the filtered and amplified heart sound signal and analyzes the information on the heart activity by analyzing the intensity, heart rate, respiration, and frequency of the heart sound, for example, as shown in FIG. Wired and wireless communication is performed with the display device to display information through the display device. In this case, the display device becomes a portable terminal, and it is preferable to use a low-cost portable terminal so as to lower the manufacturing cost during mass production of the product.

In consideration of the specifications of such a low-cost portable terminal, the present invention proposes and applies a heart rate and respiration signal detection algorithm.

First, the heart rate detection algorithm will be described, and then the respiration signal detection algorithm will be described.

Heart rate is detected by the algorithm of Equation 1 below.

For reference, one cycle of the heart sound signal is performed in the order of the first sound (S1)-> ventricular contraction (systole)-> the second sound (S2)-> ventricular diastole. At this time, the first sound corresponds to the ventricular contractor and is dull with low bass (57-70 Hz), the duration of the sound is long, and the second sound corresponds to the ventricular dilator and is sharpened to the treble (90-100 Hz), Short duration

[Equation 1]

HR = ((S1-S1 'Interval) / Sampling Rate) * 60 / min

Here, HR is the heart rate, S1 is the start time of the first sound for one period of the heart sound signal, S1 'means the start time of the first sound after S1.

In other words, the baseline of the heart sound information is stabilized by firstly differenting the heart sound information obtained by converting the filtered and amplified analog heart sound signals to digital, and then measuring the interval between the start point of S1 and the start point of S1 'as shown in FIG. Detect heart rate

The respiratory signal, which can know the respiratory rate, is detected by the algorithm of Equation 2 below.

[Equation 2]

[Revision 12.02.2010 under Rule 91]

Here, x (1), x (2), ..., x (n) means the heart sound over time, y (n) means the breathing signal to know the respiratory rate, 250 is the number of samples Means.

Where y '(n) is the respiratory signal averaged over 250 samples (or data) for the heart sound signal, and y (n) is the average over 250 samples (or data) for y' (n) Means a breathing signal.

That is, (a) of Equation 2 is a basic formula of the Moving Average filter, and (b) and (c) of Equation 2 are equations for moving average of 250 samples. By applying and (c) to detect the respiratory signal to know the respiratory rate.

Considering the heart rate and respiration signal detected by the simple algorithms of Equations 1 and 2, the low-end portable terminal can display information on heart activity through heart strength, heart rate, respiration, and frequency analysis. do.

Referring to FIG. 3, the digital esophageal stethoscope 10 according to the present invention includes a sensor unit 11, a signal preprocessor 13, a filter unit 15, a controller 17, a communication unit 19, and the like. It is configured to include.

First, the sensor unit 11 is provided with a temperature sensor 11-1 and a microphone sensor 11-2 to detect the body temperature and the sound of the patient. That is, the temperature sensor 11-1 detects the patient's body temperature from the patient's esophagus and outputs a body temperature signal, and the microphone sensor 11-2 detects the patient's heart sound and outputs a heartbeat signal.

The signal preprocessor 13 preamplifies the heart sound signal and the body temperature signal output from the sensor unit 11, and removes high frequency noise to stabilize the level of the heart sound signal and the body temperature signal.

The filter unit 15 includes first to third filters 15-1 to 15-3, corresponding to a specific low range and a specific band of the heart sound signal and the body temperature signal stabilized through the signal preprocessor 13. It filters the area and outputs the biosignal of the heart sound signal and body temperature signal to observe the heart activity.

That is, the filter unit 15 filters the heart sound signal and the temperature signal corresponding to the frequency band corresponding to the specific low range, and filters the heart sound signal and the temperature signal corresponding to the frequency band corresponding to the specific high range.

The controller (microcontroller) 17 converts the analog heart sound signal and body temperature signal filtered through the filter unit 15 into digital heart sound information and body temperature information, and substitutes the converted heart sound information into Equation 1 described above. The heart rate is detected and the heartbeat is detected by substituting the converted heart sound information into the above-described Equation 2 to detect the breathing signal and analyzing the intensity and waveform of the heart sound. Accordingly, the controller 17 obtains heart observation information including heart rate information, respiratory rate information, temperature information, and heart abnormality, and transmits the cardiac observation information to the portable terminal 20 through the communication unit 19.

In addition, the controller 17 stores (corresponds to) cardiac observation information together with patient information (eg, patient name, age, gender, etc.) and an observation date (date). That is, the controller 17 inputs the patient information and the observation date through the portable terminal 20, and when the save button is input, the controller 17 corresponds to the patient information and the observation date and the like with the corresponding cardiac observation information to the memory 18. Save it. In addition, the controller 17 transmits the heart rate information to the portable terminal 20 according to whether the pseudo unique ID inputted through the portable terminal 20 and the pseudo unique ID previously stored in the memory 18 and the PW match the PW. The transmission of cardiac observation information such as respiratory rate information, body temperature information, heart abnormality and heart sound intensity and waveforms is determined.

That is, only the doctor can check the patient's data. In addition, when the control unit 17 receives the confirmation request signal for the biometric information of the specific patient received through the communication unit 19, the cardiac observation information corresponding to the specific patient is transferred to the portable terminal 20 through the communication unit 19. Control to transmit.

The memory 18 stores programs according to the above-described algorithms of Equations 1 and 2 to obtain heart rate information and respiratory rate information. In addition, the memory 18 stores cardiac observation information according to patients. In addition, a unique ID and PW allocated to each pseudo are stored in the memory 18.

The communication unit 19 transmits the heart rate information, the respiratory rate information, and the biometric information according to an analysis result such as the strength and waveform of the heart sound to the portable terminal 20 based on the communication method. In addition, the communication unit 19 receives a pseudo unique ID and PW input from the portable terminal 20. In addition, the communication unit 19 transmits corresponding cardiac observation information according to a confirmation request signal for biometric information of a specific patient by key manipulation of the portable terminal 20.

4 is an exemplary diagram for describing screen data of cardiac state information displayed through a portable terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 4, first, FIG. 4A is screen data displayed in an authentication process for confirming whether a specific doctor is before cardiac observation information is displayed.

In other words, this is a screen for receiving a predetermined doctor unique ID and PW, so that only a doctor can check patient data. This can be changed whether the authentication process is executed by setting the authentication environment using any one of the portable digital esophageal stethoscope 10 and the portable terminal 20.

4B illustrates screen data for inputting patient information. For example, when a patient's name, age, sex, and observation date (date) are input, and the SAVE button is received, the input information is stored.

Subsequently, by pressing the device connection button, the portable terminal 10 may receive cardiac observation information from the portable digital esophageal stethoscope 10 and check the strength and waveform of the heart sound through the received cardiac observation information. Here, the intensity and waveform of the heart sound become the most important information of the heart observation information.

Figure 4 (c) shows the information on the HRV (Heart Rate Variability) and respiration information analyzed through the acquired heart sound information. Here, HRV, Poincare Plot, Histogram, and respiration can be used to check whether the patient's heart condition is normal during or after surgery.

4 (d) shows screen data showing information on power spectrum density, and shows information about an autonomic nervous system (sympathetic and parasympathetic) of a patient in a frequency domain rather than a time domain.

In general, the frequency band of the VLF component is 0.003 to 0.04 Hz, which reflects information about both the sympathetic and parasympathetic nerves, and the LF (0.05 to 0.15 Hz) and HF (0.15 to 0.40 Hz) components reflect the information about the parasympathetic nerves. do.

In the present invention, in order to express such information more quantitatively, screen data is configured as shown in FIG.

4 (e) is screen data showing information on the final result, and information on heart rate, body temperature, and respiration of the current patient is displayed numerically to determine whether there is a heart abnormality.

5 is a flow chart illustrating a patient state detection method using a portable digital esophageal stethoscope system according to another embodiment of the present invention.

Referring to FIG. 5, a catheter equipped with a temperature sensor 11-1 and a microphone sensor 11-2 of the portable digital esophageal stethoscope 10 is first inserted into an esophageal part of a patient (S501).

Thereafter, the portable digital esophageal stethoscope 10 detects the body temperature of the patient through the temperature sensor 11-1, and detects the heart sound of the patient through the microphone sensor 11-2 (S503).

Then, the portable digital esophageal stethoscope 10 filters a specific frequency band and amplifies a predetermined level at the same time so as to accurately and easily detect the heart rate detection and the respiration signal using the heart sound signal according to the detected heart sound (S505). ).

Then, the portable digital esophageal stethoscope 10 converts the filtered and amplified analog heart sound signal into digital heart sound information, and firstly differentiates the converted heart sound information to stabilize the baseline of the heart sound information, and then The heart rate is detected by measuring the interval between the start time of the first sound (S1) and the start time of the next first sound (S1`) for one cycle of (S507).

That is, the heart rate is detected using the above equation (1).

In addition, the portable digital esophageal stethoscope (10) is a respiratory signal that can know the respiratory rate using the equation (2) moving average of 250 samples to the basic equation of the Moving Average filter the heart sound information converted to digital heart sound information It is detected (S509).

By using the heart rate and the respiration signal detected in steps 507 and 509, heart observation information, which has been performed to analyze the intensity and waveform of the heart sound, heart rate, respiration, and frequency, is transmitted to the portable terminal 20 based on a specific communication method ( S511).

Then, the portable terminal 20 receives cardiac observation information (S513), and displays the abnormality of the heart by numerical value and quantification using the received cardiac observation information (S515).

At this time, the service can be confirmed so that the cardiac observation information can be confirmed only if the authentication is successful through the authentication process. To this end, a pseudo unique ID and PW assigned to either the portable digital esophageal stethoscope 10 or the portable terminal 20 should be stored.

The digital esophageal stethoscope system 100 described above is a technical configuration of displaying, through the portable terminal 20, cardiac observation information acquired through the digital esophageal stethoscope 10.

However, the digital esophageal stethoscope system of another embodiment may be made of a technical configuration of the digital esophageal stethoscope 30 as shown in FIG. 6 by additionally adding a function of displaying the digital esophageal stethoscope 10.

That is, the digital esophageal stethoscope 30 detects the heart sound and body temperature of the patient and outputs the heart sound signal and the body temperature signal 31 (temperature sensor: 31-1, microphone sensor: 32-1), and the sensor unit ( 31) the pre-amplification of the heart sound signal and the body temperature signal from the pre-amplification, to remove the high-frequency noise to stabilize the level of the heart sound signal and the body temperature signal 33 and the stabilized heart sound signal and the body temperature signal to the frequency of a specific band A filter unit 35 (first to third filters: 35-1 to 35-3) for outputting a heart sound signal and a body temperature signal for filtering a band to observe a heart rate and a respiration signal, and a filtered heart sound signal It converts the body temperature signal into digital heart sound information and body temperature information, stabilizes the baseline of the heart sound information by first-differentiating the converted heart sound information, detects the heart rate, and applies the converted heart sound information to the Moving Average filter. Moving average detects breathing signal The controller 37 obtains cardiac observation information corresponding to the abnormality of the heart by analyzing the intensity and waveform of the heart sound, and the patient information, the date of observation, and the cardiac observation information are controlled under the control of the controller 37. The memory 38 and the display unit 39 for displaying the cardiac observation information is stored in correspondence with each other according to the operation, the operation and action of this technical configuration is the digital esophageal stethoscope 10 of the above-described embodiment and same.

However, the digital esophageal stethoscope 30 of another embodiment has a technical configuration in which the display unit 39 of the display function is added in addition to the technical configuration of the digital esophageal stethoscope 10 of one embodiment.

7 is a flow chart illustrating a patient state detection method using a portable digital esophageal stethoscope system according to another embodiment of the present invention. Here, since steps 701 to 709 of step S709 of FIG. 7 are the same as steps 501 to 509 of FIG. 5 described above, detailed description thereof will be omitted.

Referring to FIG. 7, the portable digital esophageal stethoscope 30 uses the heart rate and the respiration signal detected in steps 707 and 709 to measure heart intensity and waveform, heart rate, respiration, and frequency analysis. And quantification to indicate whether the heart is abnormal (S711).

Referring to FIG. 8, according to another embodiment of the present invention, the digital esophageal stethoscope system 200 is provided with a portable digital esophageal stethoscope 40 and a portable terminal 50.

The portable digital esophageal stethoscope 40 detects the heart sound and body temperature of the patient and outputs a heart sound signal and a body temperature signal (41) (temperature sensor: 41-1, microphone sensor: 42-1), and sensor unit 41 Signal preprocessor 43 for stabilizing the level of the heart sound signal and the body temperature signal by pre-amplifying the heart sound signal and the body temperature signal, and removing the high frequency noise; The filter unit 45 (first to third filters: 45-1 to 45-3) for outputting a heart sound signal and a body temperature signal for observing the heart rate and respiration signal by filtering on the filtered heart sound signal and the body temperature. It comprises a communication unit 47 for transmitting a signal to the portable terminal 50 in accordance with a specific communication method.

The portable terminal 50 includes a communication unit 51 for receiving the filtered heart sound signal and a body temperature signal from the communication unit 47 of the portable digital esophageal stethoscope 40 according to a specific communication method, and the filtered unit received through the communication unit 51. It converts the heart sound signal and the temperature signal into digital heart sound information and body temperature information, stabilizes the baseline of the heart sound information by firstly differenting the converted heart sound information, detects the heart rate, and applies the converted heart sound information to the Moving Average filter. Respiratory signal is detected by moving average of the number of samples, and the control unit 53 and the control unit 53 are configured to obtain the cardiac observation information corresponding to the abnormality of the heart by analyzing the intensity and waveform of the heart sound. And a display unit 55 for displaying cardiac observation information.

That is, the portable digital esophageal stethoscope system 200 of FIG. 8 uses the portable digital esophageal stethoscope 40 to transmit a heart sound signal and a body temperature signal to a patient's heart rate signal and a body temperature signal to a specific communication method. By transmitting to the portable terminal 50, by using the heart sound signal and the body temperature signal received by a specific communication method through the portable terminal 50 to display the heart observation information obtained by detecting the heart rate and respiratory rate.

9 is a flow chart illustrating a patient state detection method using a portable digital esophageal stethoscope system according to another embodiment of the present invention. Here, since step 901 (S901) to step 905 (S905) of FIG. 9 is the same as step 501 (S501) to step 505 (S505) of FIG. 5 described above, a description thereof will be omitted below.

Referring to FIG. 9, the portable digital esophageal stethoscope 40 transmits the heart sound signal and the body temperature signal, which have been filtered and amplified to a predetermined level in step 905, to the portable terminal 50 based on a specific communication method (S907).

Thereafter, the portable terminal 50 receives the heart sound signal and the body temperature signal (S909), converts the received analog heart sound signal into digital heart sound information, and firstly differentiates the converted heart sound information to the base line of the heart sound information ( After stabilizing the baseline, the heart rate is detected by measuring the interval between the start time of the first sound S1 and the start time of the next first sound S1` for one cycle of the heart sound signal (S911). At this time, the portable terminal 50 uses the above equation (1).

In addition, the portable terminal 50 detects the respiratory rate by acquiring a respiratory signal by using Equation 2 which moves 250 samples to the basic equation of the Moving Average filter on the heart sound information converted into digital heart sound information (2). S913).

Subsequently, the portable terminal 50 uses the heart rate and the respiratory rate detected in steps 911 and 913 to quantify and quantify the card using the heart observation information including the intensity and waveform of the heart sound, the heart rate, the respiratory rate, and the frequency analysis information. Whether or not the heart is displayed (S915).

Referring to FIG. 10, according to another embodiment of the present invention, the digital esophageal stethoscope system 300 includes a portable digital esophageal stethoscope 60 and a portable terminal 70.

The portable digital esophageal stethoscope 60 detects the heart sound and body temperature of the patient and outputs the heart sound signal and the body temperature signal (61) (temperature sensor: 61-1, microphone sensor: 62-1), and sensor unit 61 Signal preprocessor 63 for pre-amplifying the heart sound signal and the body temperature signal, and removing high frequency noise to stabilize the level of the heart sound signal and the body temperature signal, and the stabilized heart sound signal and the body temperature signal in the frequency band of a specific band. A filter unit 65 (first to third filters: 65-1 to 65-3) for outputting a heart sound signal and a body temperature signal for observing the heart rate and the respiration signal by filtering on the filtered heart sound signal and the body temperature. A control unit 67 for converting a signal into digital heart sound information and body temperature information and applying the converted heart sound information to a moving average filter to move average of 250 samples to detect a respiratory signal; Specific breath and body temperature signals It is configured to include a communication unit 69 for transmitting to the portable terminal 70 according to the scheme.

The portable terminal 70 includes a communication unit 71 for receiving a heart sound signal, a respiration signal, and a temperature signal from the communication unit 69 of the portable digital esophageal stethoscope 60 according to a specific communication method, and the heart sound received through the communication unit 71. Digitally convert the signal, respiration signal, and body temperature signal to the first derivative of the digitally converted heart sound information to stabilize the baseline of the heart sound information to detect heart rate, and detect the respiratory rate by digitally converted respiration signal. And a display unit 75 for displaying cardiac observation information under the control of the control unit 71, after the intensity and waveform, heart rate, respiratory rate, and frequency analysis are performed.

That is, the portable digital esophageal stethoscope system 300 of FIG. 10 detects the heart rate and the respiratory signal through the heartbeat signal and the body temperature signal of the patient through the portable digital esophageal stethoscope 60 to the portable terminal 70 by a specific communication method. Transmitting and displaying the heart observation information obtained by analyzing the intensity and waveform, heart rate, respiration and frequency of the heart sound using the heart rate and respiration signal received by the specific communication method through the portable terminal 70.

11 is a flow chart illustrating a patient state detection method using a portable digital esophageal stethoscope system according to another embodiment of the present invention. Here, since steps 1101 (S1101) to 1105 (S1105) of FIG. 11 are the same as those of steps 501 to 505 (S505) of FIG. 5 described above, description thereof will be omitted below.

Referring to FIG. 11, the portable digital esophageal stethoscope 60 converts the heart sound signal filtered and amplified in step 1105 into digital heart sound information and moves and averages 250 samples to the basic equation of the Moving Average filter. Detecting a respiratory signal to know the respiratory rate using (S1107).

Thereafter, the portable digital esophageal stethoscope 60 transmits the detected respiration signal, the filtered heart sound signal, and the body temperature signal amplified to a predetermined level to the portable terminal 70 based on a specific communication method (S1109).

Then, the portable terminal 70 receives a respiration signal, a heart sound signal, and a body temperature signal based on a specific communication method (S1111), converts the received heart sound signal into digital heart sound information, and then converts the converted heart sound information into a first derivative. After the baseline of the heart sound information is stabilized, the heart rate is detected by measuring the interval between the start time of the first sound S1 and the start time of the next first sound S1 '(S1113).

In addition, the portable terminal 70 converts the respiratory signal received from the portable digital esophageal stethoscope 60 to digital, and detects the respiratory rate from the digitally converted respiratory signal (S1115).

Then, the portable terminal 70 displays the abnormality of the heart by numerically and quantifying the cardiac observation information obtained by analyzing the heart rate and the respiratory signal (S1117).

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

According to the present invention, the portable digital esophageal stethoscope system is more numerically and quantitatively whether or not the heart of the patient is operating normally and after surgery through more diverse data (analysis of heart strength, heart rate, respiration, and frequency) than the conventional esophageal stethoscope. By observing cardiac activity, it is possible to contribute to the development of portable medical devices.

Claims

In the portable digital esophageal stethoscope system,

It is inserted into the esophagus of the patient, detects the heart sound signal and the body temperature signal, detects the heart rate and respiratory signal from the heart sound signal, analyzes the heart rate and the respiratory rate obtained from the respiratory signal to the cardiac observation information according to a specific communication method Transmitting digital esophagus stethoscope; And

Portable digital esophageal stethoscope system, characterized in that it comprises a portable terminal for receiving the cardiac observation information according to the specific communication method and the numerical value and quantification of the heart size, body temperature, heart rate and respiratory rate with the presence of heart abnormality .
The method of claim 1, wherein the digital esophagus stethoscope,

A sensor unit for sensing a heart sound and body temperature of the patient and outputting a heart sound signal and a body temperature signal;

A signal preprocessing unit pre-amplifying the heart sound signal and the body temperature signal from the sensor unit and pre-amplifying the sound signal and stabilizing the level of the heart sound signal and the body temperature signal by removing high frequency noise;

A filter unit for filtering the stabilized heart sound signal and the body temperature signal for a frequency band of a specific band and outputting a heart sound signal and a body temperature signal for observing a heart rate and a respiration signal;

The filtered heart sound signal and the body temperature signal are converted into digital heart sound information and body temperature information, the first derivative of the converted heart sound information is stabilized to stabilize the baseline of the heart sound information, and the heart rate is detected. A control unit configured to apply a filter to a moving average of a plurality of samples to detect a respiration signal, and to analyze heart intensity and waveforms to determine whether a heart is abnormal and to obtain corresponding cardiac observation information; And

And a communication unit for transmitting the cardiac observation information to the portable terminal according to the specific communication method.
The method of claim 2, wherein the sensor unit,

A temperature sensor for sensing a body temperature of the patient from the esophagus and outputting a body temperature signal; And

A portable digital esophageal stethoscope system, characterized in that it comprises a microphone sensor for detecting the heart sound of the patient to output a heart sound signal.
The method of claim 2, wherein the control unit,

Receives a doctor unique ID and PW input from the portable terminal through the communication unit, and if the received doctor unique ID, PW, and the previously stored doctor unique ID and PW match, the requested cardiac observation information and body temperature information to the portable terminal. A portable digital esophageal stethoscope system, characterized in that for transmitting.
The method of claim 2, wherein the control unit,

Patient condition detection method using a portable digital esophageal stethoscope system, characterized in that for detecting the heart rate using Equation 1 below.

(Equation 1)

HR = ((Sn-Sn 'Interval) / Sampling Rate) * 60 / min

Here, HR is the heart rate, Sn is the start time of a specific sound for a specific period of the heart sound signal, Sn 'means the start time of a specific sound of the next period of Sn.
The method of claim 2, wherein the control unit,

A patient state detection method using a portable digital esophageal stethoscope system, characterized in that to detect the respiratory rate by calculating the respiratory signal by applying the acquired heart sound signal to the moving average twice or more during a specific time.
The portable digital esophageal stethoscope system according to claim 1, further comprising a memory in which patient information, observation date, and cardiac observation information are stored in correspondence with each other under the control of the controller.
In the portable digital esophageal stethoscope system,

Is inserted into the esophagus of the patient, detects the heart sound signal and body temperature signal, the heart sound signal and body temperature signal that can observe the heart rate and respiration signal by filtering the heart sound signal and body temperature signal for the frequency band of a specific band specific communication method Digital esophagus stethoscope transmitted by; And

Receiving the heartbeat signal and the body temperature signal by the specific communication method detects the heart rate and respiratory signal from the heartbeat signal, heart failure using the heart observation information obtained by analyzing the respiratory rate obtained from the heart rate and respiratory signal A portable digital esophageal stethoscope system, comprising: a portable terminal including a portable terminal for displaying and quantifying and quantifying the size, body temperature, heart rate, and respiratory rate of the heart sound together with whether or not.
The method of claim 8, wherein the digital esophagus stethoscope,

A sensor unit for sensing a heart sound and body temperature of the patient and outputting a heart sound signal and a body temperature signal;

A signal preprocessing unit pre-amplifying the heart sound signal and the body temperature signal, and stabilizing levels of the heart sound signal and the body temperature signal by removing high frequency noise;

A filter unit for filtering the stabilized heart sound signal and the body temperature signal for a frequency band of a specific band and outputting a heart sound signal and a body temperature signal for observing a heart rate and a respiration signal; And

A portable digital esophageal stethoscope system comprising a communication unit for transmitting the filtered heart sound signal and body temperature signal according to a specific communication method.
The method of claim 8, wherein the portable terminal,

A communication unit which receives the heart sound signal and the body temperature signal according to the specific communication method;

The received heart sound signal and the body temperature signal are converted into digital heart sound information and body temperature information, and the converted heart sound information is firstly differentiated to stabilize the baseline of the heart sound information to detect the heart rate, and then convert the converted heart sound information into a moving average. A controller which applies a filter to a moving average of a plurality of samples to detect a respiration signal, and analyzes the intensity and waveform of the heart sound to determine whether the heart is abnormal and to obtain corresponding cardiac observation information; And

And a display unit for displaying cardiac observation information under the control of the control unit.
In the portable digital esophageal stethoscope system,

A digital esophagus stethoscope inserted into the esophagus of the patient to detect a heart sound signal and a body temperature signal, and detect a breathing signal from the heart sound signal to transmit the heart sound signal, the breathing signal and the body temperature signal by a specific communication method; And

Detecting the respiratory rate from the breathing signal received by the specific communication method, Detecting the heart rate from the heart sound signal received by the communication method, Cardiac abnormalities using the heart observation information obtained by analyzing the heart rate and respiratory rate Portable digital esophageal stethoscope system, characterized in that it comprises a portable terminal for displaying and quantifying the size, body temperature, heart rate and respiratory rate of the heart sound.
The method of claim 11, wherein the digital esophagus stethoscope,

A sensor unit for sensing a heart sound and body temperature of the patient and outputting a heart sound signal and a body temperature signal;

A signal preprocessing unit pre-amplifying the heart sound signal and the body temperature signal, and stabilizing levels of the heart sound signal and the body temperature signal by removing high frequency noise;

A filter unit for filtering the stabilized heart sound signal and the body temperature signal for a frequency band of a specific band and outputting a heart sound signal and a body temperature signal for observing a heart rate and a respiration signal;

A control unit for converting the filtered heart sound signal and the body temperature signal into digital heart sound information and body temperature information, and applying the converted heart sound information to a moving average filter to move average of a plurality of samples to detect a respiration signal; And

And a communication unit for transmitting the filtered heart sound signal, the detected breathing signal, and the body temperature signal to a portable terminal according to a specific communication method.
The method of claim 11, wherein the portable terminal,

A communication unit for receiving a heart sound signal, a respiration signal and a body temperature signal according to a specific communication method;

By converting the heart sound signal, respiration signal and body temperature signal to digital, the first derivative of the digital sound heart information is stabilized to stabilize the baseline of the heart sound information to detect the heart rate, and the respiratory rate is detected by the digitally converted breath signal. A controller configured to obtain cardiac observation information after analyzing the strength and waveform of the sound, the heart rate, the respiratory rate, and the frequency; And

And a display unit for displaying cardiac observation information under the control of the control unit.
The portable digital esophageal stethoscope detects a patient's body temperature and heart sound, and simultaneously filters a specific frequency band and a certain level of amplification for easy heart rate detection and respiration signal detection from the detected heart sound signal;

Detecting a heart rate by firstly differenting the digitally converted heart sound information with respect to the filtered and amplified heart sound signal by measuring a distance between a start point of a specific sound Sn and a start point of a specific sound Sn 'of a next period;

Detecting a respiratory signal by applying a moving average of the digital sound heart information, which has been digitally converted, to the filtered and amplified heart sound signal two or more times during a specific time;

Transmitting cardiac observation information on which the strength and waveform of the heart sound, heart rate, respiration, and frequency analysis are performed on the detected heart rate and respiration signal to a portable terminal based on a specific communication method; And

The portable terminal is a patient state detection method using a portable digital esophageal stethoscope system, characterized in that the numerical and quantified using the cardiac observation information to display the body temperature of the patient with the abnormality of the heart.
The method of claim 14, wherein detecting the heart rate comprises:

Patient state detection method using a portable digital esophageal stethoscope system, characterized in that for detecting the heart rate using Equation 3 below.

(Equation 3)

HR = ((Sn-Sn 'Interval) / Sampling Rate) * 60 / min

Here, HR is the heart rate, Sn is the start time of a specific sound for a specific period of the heart sound signal, Sn 'means the start time of a specific sound of the next period of Sn.
The method of claim 14, wherein the detecting of the breathing signal comprises:

A method of detecting a patient state using a portable digital esophageal stethoscope system, characterized in that to detect the respiratory rate by calculating the respiratory signal by applying the acquired heart sound signal two or more moving averages during a specific time.
The portable digital esophageal stethoscope detects the patient's body temperature and heart sound and filters the specific frequency band for easy heart rate detection and respiratory signal detection. Transmitting;

The portable terminal firstly differentiates the heart sound information digitally converted with respect to the filtering and the amplified heart sound signal received according to a specific communication method, and starts the specific sound Sn and the specific sound Sn 'in the next period. Detecting a heart rate by measuring an interval between start points;

Detecting a respiratory signal by applying a moving average of the digital sound heart information, which has been digitally converted, to the filtered and amplified heart sound signal two or more times during a specific time; And

And displaying the body temperature of the patient along with the abnormality of the heart by numerically and quantifying the detected heart rate and the respiratory signal using cardiac observation information on which the intensity and waveform of the heart sound, heart rate, respiration, and frequency analysis were performed. Patient state detection method using a portable digital esophageal stethoscope system, characterized in that.
The portable digital esophageal stethoscope detects a patient's body temperature and heart sound, and simultaneously filters a specific frequency band and a certain level of amplification for easy heart rate detection and respiration signal detection from the detected heart sound signal;

Transmitting the heartbeat information, which is digitally converted to the filtered and amplified heartbeat signal, to the portable terminal according to a specific communication method and detecting the detected breathing signal and the heartbeat signal by applying a moving average two or more times during a specific time;

The portable terminal receives the heart sound signal and the breathing signal according to the specific communication method and firstly differentiates the heart sound information digitally converted into a specific sound (Sn) starting point and the interval between the start point of the specific sound (Sn ') of the next period. Detecting the heart rate by measuring the heart rate; And

After detecting the respiratory rate by digitally converting the received respiratory signal, the abnormality of the numerical value and the quantified heart using the cardiac observation information obtained by performing the intensity and waveform, heart rate, respiratory rate and frequency analysis of the heart sound and the A patient state detection method using a portable digital esophageal stethoscope system, characterized in that it comprises the step of displaying the body temperature of the patient.