KR101107490B1 - Peak heartbeat detection system and its method - Google Patents

Abstract

The present invention relates to a peak heart rate detection system inserted into the body of a heart disease patient in the form of a single chip, and more particularly to a system capable of determining tachycardia or bradycardia.
The present invention detects a peak by sensing a ventricular or atrial signal through a peak detection module, and determines an abnormal state of the heart based on the detected peak information. More specifically, the present invention is to determine the presence of tachycardia abnormality by measuring the elapsed time after the threshold level of the detected peak is out of the minimum threshold level, by quickly determining the presence of bradycardia abnormality using the minimum threshold level retention time The cardiac rhythm detection system can detect both tachycardia and bradycardia.

Description

Peak heart rate detection system and method {PEAK HEARTBEAT DETECTION SYSTEM AND ITS METHOD}

The present invention relates to a peak heart rate detection system and method for recognizing tachycardia and bradycardia in a heart at high speed using a single system.

In general, a system for detecting a heartbeat signal equipped with a one-chip function for measuring biopotential for the treatment of arrhythmia (thermocardia and tachycardia), which is one of heart diseases, has a pair of electrical leads placed on the heart or on the body. It refers to a system that attaches to detect a heartbeat and generates electrical stimulation corresponding thereto.

In addition, an example of such a heartbeat signal detection system is disclosed in Japanese Unexamined Patent Publication No. Hei 08-229013, Korean Unexamined Patent Publication No. 2002-0028539, and the like.

In Japanese Patent Application Laid-Open No. 08-229013, as shown in FIG. 1, a heartbeat signal detection system includes an amplifier 110 for amplifying an output from a pulse wave sensor 100 and a low pass filter for passing low frequency components of pulse wave. 120, a sample hold circuit 130 for sampling and sampling the LPF signal at regular intervals, an A / D converter 140 for digitizing an analog signal, and a CPU 150 for inputting an output of the A / D converter. And a keyboard 160 which is an input means of the CPU, a timer 170 having a clock generator and a counter, a memory 180 including ROM and RAM, and an output device 190 for outputting a calculation result from the CPU 150. It is described that the electrocardiogram RR interval and its variation can be estimated with certainty without using an electrocardiograph.

According to this device, the pulse wave RR interval, the average pulse wave RR interval, and the pulse wave RR interval standard deviation can be easily obtained, and the pulse wave RR interval is electrocardiogram because the pulse wave propagation speed is very fast and is transmitted to the body at the same time as the heart beat. It is equivalent to the RR interval.

The Korean Laid-Open Patent Publication No. 2002-0028539 discloses a heartbeat of a human body by configuring an electrode unit 210, an amplifying filter unit 220, a waveform shaping unit 230, and a pulse signal transmitting unit 240 as shown in FIG. 2. The present invention relates to a pulse detection device and an automatic first aid notification system for monitoring a wearer's health by using an electrocardiogram signal for 24 hours and collecting and managing the wearer's health. The patent publication applies an electrocardiogram detection method that detects an electrocardiogram signal generated by a human heart pulsation and measures a pulse rate, thereby managing a user's health condition 24 hours and automatically generating an emergency signal when an abnormality occurs. It is disclosed about first aid.

That is, the system suggests that pulse data is stored in a memory for a certain period of time, and then data are collected using a data collector and databased to analyze the state of health and then take appropriate measures.

However, the above-described Japanese Patent Application Laid-Open No. 08-229013 has a problem in that power consumption is high by sampling all of the threshold voltage or more set in A / D conversion of the ECG signal. Since the Republic of Korea Patent Publication No. 2002-0028539 removes the pulse signal by the amplification filter unit, there is a problem that the power consumption due to the circuit operation on the noise of the amplification filter unit is high.

In order to solve the problems of the prior art, the heartbeat is sensed at low power by detecting the atrial signal without being affected by the ventricular signal by using the threshold level for detecting the adaptive pattern by the input pattern. It is an object of the present invention to provide a peak heart rate detection system and method capable of recognizing a disease-related disease.

In addition, an object of the present invention is to provide a peak heart rate detection system and method that can determine the tachycardia abnormality and bradycardia abnormality at high speed by using the abnormal state determination unit.

In order to achieve the above object, the present invention can provide a peak heart rate detection system and method that can quickly determine the abnormal state of the heart, that is, tachyarrhythmias and bradycardia arrhythmias through a signal detected by sensing a heartbeat signal have.

In the present invention, a peak heart rate detection system inserted into the body of a heart disease patient in the form of a single chip and detecting heart disease, comprising: a peak detection module for detecting a peak by sensing a ventricular or atrial signal, and receiving the detected peak The apparatus may include an abnormal state determination unit configured to determine an abnormal state of the heart at high speed, and include a symptom determination module to determine the disease of the heart by extracting peak information through the detected peak.

In the present invention, the peak detection module detects a peak above a set minimum threshold level, and may reduce the threshold level by 5 levels every second from a level that is 75% of the peak level after 100 ms after the peak detection.

In the present invention, the peak detection module includes a sensing unit for sensing a ventricular or atrial signal, an analog-digital converter for converting the sensed analog signal into a digital signal, and a peak of the ventricular or atrial signal converted into the digital signal. It may include a peak detector for detecting.

In the present invention, the symptom determination module is configured to receive a peak detected by the peak detection unit, an abnormal state determination unit that determines a tachycardia or bradycardia abnormal state through a minimum threshold entry interval, and the peak detected by the peak detection unit. An adaptive pattern unit for extracting and storing peak information from the apparatus, an evaluator for evaluating the state of the ventricles and the atria through the peak information, and determining the disease according to the result of the abnormal state determination unit and the information evaluated by the evaluator It may include a determination unit.

In the present invention, the abnormal state determination unit may determine the tachycardia or bradycardia abnormal state at high speed by adjusting the threshold level to calculate the elapsed time after the minimum threshold level departure or the minimum threshold level retention time.

In more detail, when the elapsed time after the minimum threshold level departure is 600ms or more, it may be determined as a tachycardia abnormal state, and when the minimum threshold level retention time is 1200ms or more, it may be determined as a bradycardia abnormal state.

In the present invention, the evaluation unit, an on-set evaluation unit for evaluating the ventricular signal interval from the information of the adaptive pattern unit, a stability evaluation unit for determining whether the ventricular signal interval is within a reference value according to the output of the adaptive pattern unit, and the adaptive pattern It may include a program logic evaluation unit for determining a diagnostic algorithm from the negative information.

In the present invention, the determination unit, a quick determination for the normal, tachyarrhythmia, or bradycardia arrhythmias that are the result of the abnormal state determination unit, normal, Ventricular Tachycardia (VT), Fast Ventricular Tachycardia (FVT), If it is possible to determine the specific disease of Ventricular Fibrillation (VF), ATal AF (Atrial Tachycardia-Atrial Fibrillation), or FAT-AF (Fast Atrial Tachycardia-Atrial Fibrillation), it can be output through the output.

In the present invention, the peak information may include the interval between the peaks, the peak occurrence time, the number of times the relative signal jumped between the signal generation of the atrium or the ventricles, the interval between the atria and the ventricular peaks, or the far field. It may include at least one or more information selected from the pulse wave.

In addition, the present invention relates to a method for detecting abnormal state of the heart at high speed using the peak heart rate detection system described above, comprising detecting a peak of a ventricular or atrial signal, and adjusting the threshold level to minimize Forming a threshold level. And calculating a time for which the detected peak maintains the minimum threshold level, and determining the bradycardia abnormal state if the holding time is 1200 ms or more.

In this case, when the holding time is less than 1200 ms, the process may return to the step of detecting the peak and execute a subsequent step.

In addition, the present invention relates to a peak heart rate detection method for detecting an abnormal state of the heart at a high speed using the peak heart rate detection system described above, the method comprising detecting a peak of a ventricular or atrial signal, the threshold level Adjusting to form a minimum threshold level. And calculating an elapsed time after the peak deviates from the minimum threshold level, and if the elapsed time is 600 ms or more, determining the tachycardia abnormal state.

In this case, if the elapsed time is less than 600 ms, the process may return to the step of detecting the peak and then perform the subsequent step.

In the present invention, the detecting of the peak may detect 500 to 700 peaks per minute, preferably 600 peaks. As a result, the heart rate of a beating patient, which is a type of tachycardia with an increased heart rate of up to 600 beats per minute, can also be detected.

According to the present invention, the heart rate is sensed at low power, and through an abnormal state determination unit, it is possible to determine a tachycardia abnormality and bradycardia abnormal state at high speed by using one system.

In addition, according to the present invention, it is possible to reduce the economic and social losses caused by the disease by quickly determining the disease associated with heart disease and outputting the prescription.

1 is a block diagram showing the electrical configuration of a conventional pulse wave RR interval measuring apparatus.
2 is a block diagram of a conventional pulse detection device.
3 is a block diagram showing a peak heart rate detection system including an abnormal state determination unit according to an embodiment of the present invention.
4 is a block diagram showing an abnormal state determination unit according to an embodiment of the present invention.
5 is a flowchart illustrating a peak heart rate detection method of an abnormal state determination unit according to an exemplary embodiment of the present invention.
Figure 6 is a waveform diagram showing the tachycardia peak detection according to an embodiment of the present invention.
7 is a waveform diagram showing a bradycardia peak detection according to an embodiment of the present invention.

Peak heart rate detection system and method of the present invention is a one-chip for measuring biopotential that can be recognized in the body, the peak detection unit senses the signal at low power, and forms an abnormal state determination unit, the tachycardia abnormal state It was designed to quickly recognize abnormal conditions of bradycardia.

In general, when the sensor detects atrial signals, even a small ventricular signal is detected, so a special algorithm is required to prevent unnecessary ventricular signals, which requires a lot of power.

However, the present invention detects atrial signal as a threshold level and maintains the peak level and the threshold level from the point where the peak of the ventricular signal is found to 100 ms from the point where the peak of the ventricular signal is found. The adaptive detection method is to reduce the heart rate at low power by applying a method of decreasing the level by 5 levels from 75% of the level until the next ventricular signal is met.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components, and the same reference numerals will be used to designate the same or similar components. Detailed descriptions of known functions and configurations are omitted.

3 is a block diagram showing a peak heart rate detection system including an abnormal state determination unit according to an embodiment of the present invention.
The abnormal state determination unit compares the peak time interval with the reference time interval to determine whether the tachycardia or the bradycardia. As will be described later, the reference time interval is a time for adjusting the threshold level to maintain an elapsed time or a minimum threshold level after departure from the minimum threshold level.

Referring to FIG. 3, the peak heartbeat detection system 300, which is composed of one chip and inserted into the body, includes a peak detection module 310 that detects a peak of a heartbeat signal of a ventricle or atrial and a detected peak interval (a peak of a peak). And a symptom determination module 320 to determine the disease of the heart according to the time interval and determine the tachycardia or bradycardia abnormal state at high speed.

The peak detection module 310 includes a sensing unit 311, an A / D converter 312, and a peak detector 313, and detects a peak equal to or greater than a minimum threshold level.

In more detail, the sensing unit 311 senses a ventricular or atrial signal, the A / D converter 312 converts the sensed analog signal into a digital signal, and the peak detector 313 detects the peak of the converted signal. do.

That is, peak detection is performed on the ventricular or atrial signal according to an adaptive threshold level, and the peak-in signal is output as 1 and the rest is output as 0.

The symptom determination module 320 includes an adaptation pattern unit 321, an evaluation unit, an abnormal state determination unit 325, a determination unit 326, and an output unit 327, and the evaluation unit includes an onset evaluation unit 322, The stability evaluator 323 and the program logic evaluator 324 are included.

The adaptive pattern portion 321 is a relative between the peak interval, peak occurrence time, atrial or ventricular signal generation, which is five pieces of information at the time of peak detection with respect to the output of the peak detection unit 313. The number of times the signal beats, the distance between the atrium and the ventricles, and the presence of far field R-waves are investigated and stored.

In addition, the information stored in the adaptive pattern unit 321 transmits the results evaluated by the plurality of evaluation units to the determination unit 326 to determine the correct abnormal state of the heart (the state of the heart and the atrium).

The onset evaluator 322 evaluates whether the ventricular signal interval has recently changed rapidly according to the output of the adaptive pattern unit 321.

For example, when an average of four recent V peak intervals differs from the average of four previous ventricular maximum intervals by more than a reference value, the enable signal is transmitted to the determination unit 326.

The stability evaluator 323 evaluates whether the latest ventricular signal interval occurs stably according to the output of the adaptive pattern unit 321. If the difference between the previous three ventricular maximums is greater than or equal to the maximum reference value, the enable signal is transmitted to the determination unit 326.

The program logic evaluator 324 distinguishes supra ventricular tachycardia (SVT) from other ventricular tachycardia (VT) or ventricular fibrillation (VF). Several criteria known by the algorithm can be used.

Although only three evaluation units have been described above, the present invention is not limited thereto, and the information stored in the adaptation pattern unit 321 may go through the evaluation unit to accurately determine heart disease.

However, in this case, at least 8 peaks must be detected so that the evaluation unit can evaluate, so it takes at least 1.6 seconds to determine the abnormal condition of the heart. You may also have problems that can take a long time after treatment for a heart condition.

Accordingly, in the present invention, in order to quickly recognize the abnormal condition of the patient that requires early treatment, the abnormal state determination unit 325 using the minimum threshold level entry interval may be formed to detect not only bradycardia but also tachycardia. have.

In more detail, the abnormal state determination unit 325 receives the peak information detected by the peak detection module 310 and detects the minimum threshold level entry interval 410, and the minimum threshold level entry interval detection unit. And a control signal generator 420 which determines whether or not an abnormal state is received as an input of the output signal (see FIG. 4).

Hereinafter, a method of detecting the bradycardia abnormality and the tachycardia abnormal state at a high speed by the abnormal state determination unit 325 may refer to FIGS. 5 to 7.

The determination unit 326 may determine whether or not a disease is five stages according to the results of the abnormal state determination unit 325 and the information evaluated by the evaluation unit, and may output the prescription of eight stages according to the disease. have.

Diseases that can be discriminated by the system according to the present invention include normal, Ventricular Tachycardia (VT), Fast Ventricular Tachycardia (FVT), Ventricular Fibrillation (VF), Atrium AFchy (Atrial Tachycardia-Atrial Fibrillation), and FAT-AF Fast Atrial Tachycardia-Atrial Fibrillation.

SVT is a supra-ventricular tachycardia, a cardiac ventricular tachycardia (fast-pulsing disease), and since SVT often uses the normal conduction pathway of the heart, it is a device that uses current algorithms. Use medications without forced treatment.

Thus, various criteria are used in the algorithm to distinguish SVT from other ventricular tachycardia (VT) or ventricular fibrillation (VF), and the program logic evaluation unit 324 described above determines the algorithm.

That is, the determination unit 326 discriminates and determines the normal state, VF state, VT state, FVT via VF state, FVT via VT state, and AT AF state by using the output of the evaluation unit. The result of 325 is transmitted to the output unit 329.

The output unit 329 outputs a result value in 8 bits so that a treatment suitable for the state determined by the determination unit 326 can be output.

After the prescription at the output unit 329, when the steady state is maintained, it is enabled (enable), the determination unit 326 is off and only the peak detection is performed.

As described above, in the present invention, peak detection is a method of detecting another peak by changing a threshold level after peak detection, that is, a method capable of adaptive threshold detection.

When a signal is input, the threshold level detects the peak and remains at the same level as the peak until 100 msec. When it reaches 100msec, it drops to 75% of the threshold level and then decreases by 5 levels to detect the next signal.

As a result, up to 500 to 700 peaks per minute can be detected, and more preferably 600 peaks can be detected. This allows for rapid recognition of tachycardia, an increase in heart rate of up to 600 beats per minute.

If the next signal is not detected until the minimum threshold level, the threshold level remains at the same level as the minimum threshold level. The symptom determination module for heart disease determines the five stages of disease by determining the detected time between the peaks measured by the peak detection module, which is the heart signal detection part, and outputs the eight stages of prescription according to the disease.

That is, the present invention uses a one-chip algorithm for measuring biopotential for heart rate blood glucose treatment and implements it in hardware. The proposed peak heart rate detection system and method is based on a heart signal detected through a sensor in the heart. It is possible to prescribe quickly by judging disease and recognizing high speed when abnormal condition occurs.

4 is a block diagram showing an abnormal state determination unit according to an embodiment of the present invention.

Referring to FIG. 4, a minimum threshold level entry interval detector 410 and a control signal generator 420 are included.

The minimum threshold level entry interval detection unit 410 detects the minimum threshold level entry interval by detecting the peak interval, that is, the time interval of the peak.

The control signal generator 420 receives the output of the minimum threshold level entrance interval detection unit from the minimum threshold level entrance interval detection unit 410 as an input and determines whether or not an abnormal state exists.

In more detail, it is determined whether there is a bradycardia abnormality by measuring the time interval between peak values leaving the threshold level after entering the threshold level, and the time interval between peak values entering the threshold level after leaving the threshold level is measured. You can judge whether there is an abnormality.

5 is a flowchart illustrating a peak heart rate detection method of an abnormal state determination unit according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the peak information input step S110 detects a peak of a ventricular or atrial signal, and the threshold level adjustment step S120 adjusts the threshold level according to the detected peak value.

In the forming of the minimum threshold level (S130), it is determined whether the adjusted threshold level is the minimum threshold level, and when the minimum threshold level is calculated, the minimum threshold level holding time is calculated (S140). The elapsed time after the level departure is calculated (S170).

If the minimum threshold level maintenance time calculated in step S140 is determined to be 1200 ms or more (S150), if the abnormality is determined to be a bradycardia abnormal state (S160), and if less than, return to step S110.

Then, it is determined whether the elapsed time after departure of the minimum threshold level calculated in step S170 is 600 ms or more (S180), in case of abnormality, the output is determined as a tachycardia abnormal state (S190).

When an abnormal condition occurs as shown in FIG. 5, the tachycardia abnormal state can be recognized only after 600 ms after the occurrence of the tachycardia abnormal state by calculating the elapsed time after the minimum threshold level deviation, and by using the calculation of the minimum threshold level maintenance time. After 1200ms after the occurrence of bradycardia, the bradycardia can be recognized.

As the abnormal state is recognized at a high speed as described above, it is possible to quickly recognize an abnormal state when a heart abnormality occurs, and it is possible to recognize both tachycardia and bradycardia abnormalities with one system.

6 is a waveform diagram illustrating tachy peak detection according to an embodiment of the present invention.

Referring to FIG. 6, in the case of tachycardia, the heartbeat interval is very narrow so that the adjusted threshold level does not reach the minimum threshold level and detects the peak again. Using this feature, the elapsed time after the minimum threshold level deviation is calculated. If it exceeds 600ms, it can determine the tachycardia abnormality at high speed according to judging the tachycardia abnormality.

7 is a waveform diagram illustrating detection of bradycardia peak according to an embodiment of the present invention.

Referring to FIG. 7, in the case of bradycardia patients, when the heartbeat interval is very wide, the time at which the adjusted threshold level is maintained at the minimum threshold level becomes longer, and the minimum threshold level retention time is calculated to exceed 1200 ms. It is possible to identify the bradycardia abnormality at high speed according to the determination of bradycardia abnormality.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It can be understood that

The present invention can be inserted into the body of a heart disease patient and used to quickly recognize a fatal disease of the heart.

110: pulse wave sensor 110: amplifier
120: low pass filter 130: sample hold circuit
140: A / D converter 150: CPU
160: keyboard 170: timer
180: memory 190: output device
210: electrode portion 220: amplification filter portion
230: waveform shaping unit 240: pulse signal transmission unit
300: peak heart rate detection system 310: peak detection module
311: sensing unit 312: A / D conversion unit
313: peak detection unit 320: symptom determination module
321: adaptive pattern unit 322: onset evaluation unit
323: stability evaluation unit 324: program logic evaluation unit
325: abnormal state determination unit 326: determination unit
327: output unit

Claims (19)

In the peak heart rate detection system inserted into the body of the heart disease in the form of a single chip to detect heart disease,
A peak detection module for detecting a peak by sensing a ventricular or atrial signal; And
An abnormal state determination unit for determining the abnormal state of the heart at high speed by comparing the peak time interval and the reference time interval of the detected peak, Determination of symptoms to determine the disease of the heart by extracting the peak information through the detected peak Include modules,
The reference time interval is a time for adjusting the threshold level to maintain the elapsed time or the minimum threshold level after departure from the minimum threshold level, and the abnormal state determining unit compares the peak time interval with the reference time interval to tachycardia abnormal state or bradycardia. Peak heart rate detection system characterized in that it determines whether or not the sexual abnormality.
The method of claim 1,
The peak detection module detects peaks above a set minimum threshold level.
The method of claim 2,
The peak heart rate detection system, characterized in that for reducing the threshold level by 5% per second level from 75% of the peak level after 100ms after the peak detection.
The method of claim 1,
The peak detection module,
A sensing unit for sensing a ventricular or atrial signal;
An analog-digital converter converting the sensed analog signal into a digital signal; And
And a peak detector for detecting a peak of a ventricular or atrial signal converted into the digital signal.
delete The method of claim 1,
The peak time interval is
And a time interval between when the peak value exits the threshold level after entering the threshold level or a time interval between when the peak value exits the threshold level and entering the threshold level again.
delete The method of claim 1,
The abnormal state determination unit
Peak heart rate detection system characterized in that it is determined as a bradycardia abnormal state if the minimum threshold level retention time is more than 1200ms.
The method of claim 1,
The abnormal state determination unit
Peak heart rate detection system characterized in that it is determined as a tachycardia abnormal state if the elapsed time after departure of the minimum threshold level is 600ms or more.
The method of claim 1,
The symptom determination module,
An abnormal state determination unit which receives the peak detected by the peak detection unit and determines whether it is a tachycardia or bradycardia abnormal state through a minimum threshold entry interval;
An adaptive pattern unit which extracts and stores peak information from the peak detected by the peak detector;
An evaluation unit for evaluating the state of the ventricles and the atria through the peak information; And
Peak heart rate detection system comprising a determination unit for determining whether the disease according to the abnormal state determination unit and the information evaluated by the evaluation unit.
The method of claim 10,
The evaluation unit,
An on-set evaluator for evaluating the ventricular signal interval from the information of the adaptive pattern portion;
A stability evaluation unit determining whether a ventricular signal interval is within a reference value according to the output of the adaptive pattern unit; And
And a program logic evaluation unit for determining a diagnostic algorithm from the information of the adaptive pattern unit.
delete delete The method of claim 1,
The peak information is,
At least one information selected from the interval between the peaks, the peak occurrence time, the number of times a relative signal has jumped between the signal generation of the atrium or ventricles, the interval between the atria and ventricular peaks, or far field pulse waves Peak heart rate detection system comprising a.
delete delete delete delete delete

Images