KR100827816B1 - Device and Method for Measuring Blood Pressure - Google Patents

Abstract

The present invention relates to an apparatus and method for measuring blood pressure, and more particularly, to an apparatus and method for measuring blood pressure using a first measuring means and a second measuring means. According to an aspect of the present invention, the blood pressure measuring device includes a pressure adjusting unit for adjusting the pressure of the first measuring means and the second measuring means, the first measuring means and the second measuring means for measuring the blood pressure change of the subject, The signal processing unit converts the blood pressure change information of the subject measured by the first measuring means and the second measuring means into the first pulsation waveform information and the second pulsation waveform information, and analyzes the first pulsation waveform information and the second pulsation waveform information. It includes a processor for measuring systolic blood pressure and diastolic blood pressure, the first measuring means and the second measuring means may be worn on the subject at least a predetermined distance from each other.

Blood pressure measuring device

Description

Device and Method for Measuring Blood Pressure

1 is an exemplary diagram of a pressure waveform for explaining an oscillometric method for a conventional blood pressure measurement.

2 is a view for explaining a blood pressure measuring method according to a preferred embodiment of the present invention.

3a and 3b is a view for explaining the configuration of the narrow pressure measuring apparatus according to an embodiment of the present invention.

Figure 4 is a view showing a pressure waveform for explaining the detection of the systolic blood pressure in the narrowing pressure measuring method according to an embodiment of the present invention.

5a and 5b is a view showing a pressure waveform for explaining the detection of diastolic blood pressure in the narrowing pressure measuring method according to an embodiment of the present invention.

 Figure 6 is a flow chart for explaining the blood pressure measuring method according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

210: first cuff 220: second cuff

230, 240: connection tube 310: first pressure sensor

320: second pressure sensor 330, 340: pressure control unit

331, 341: exhaust device 332, 342: pressure valve

333, 343: air pump 350: blood pressure measuring unit

360: signal processing unit 370: memory unit

375: key input unit 380: display unit

390: processor unit 410: the first pulsation waveform

420: second pulsation waveform

The present invention relates to an apparatus and method for measuring blood pressure, and more particularly, to an apparatus and method for measuring blood pressure using a first measuring means and a second measuring means.

The heart of the human body is pulsatingly beating to provide nutrients and oxygen necessary for the human body, and serves as a pump to supply blood to the whole body. The heart of the human body is contraction of the left ventricle with one heart beat, and blood is supplied to the aorta-arterial-arterial-capillary vessel of the human body. At this time, the maximum pressure value in the artery according to the contraction of the left ventricle is called systolic blood pressure (SBP), and the left ventricle expands for the next pulsation, and the lowest value of the blood pressure in the artery is diastolic blood pressure (Diastolic Blood Pressure; DBP). In addition, the average value of the pressure waveform in an artery in one beat is called mean blood pressure (MBP). These SBP, DBP, and MBP values are used as the most important indicators in the determination of hypertension and are managed as risk factors for cardiovascular disease.

The most accurate method of measuring blood pressure is a direct method. The direct method is to insert a thin catheter inside the artery, fill the tube with liquid, and deliver the pressure to the external pressure sensor. However, the direct method has an advantage that the measured value is accurate, but there is a disadvantage in that a catheter is inserted into the skin and blood vessel of the subject. Therefore, the direct method is used only for patients who are suffering from surgery or in an emergency because the subject suffers a lot of pain in measuring blood pressure.

On the other hand, blood pressure is measured using an indirect method in daily or outpatient clinics. There are several methods of indirect methods, but there are the traditional methods of stethoscope (Korotokof Sound method). Auscultation requires the mastery of a medical professional and has many disadvantages. Therefore, daily blood pressure is measured using an automatic blood pressure monitor. Most automatic sphygmomanometers use the Oscillometric Method.

1 is an exemplary diagram of a pressure waveform for explaining an oscillometric method for measuring a conventional blood pressure.

The oscillometric method wraps a cuff, a pouch of air, on the subject's upper arm and fills it with a pressure higher than the systolic blood pressure to narrow the artery passing through the upper arm to the pressure of the cuff to prevent blood from passing through. The oscillometric method then measures the pressure of the cuff while slowly evacuating the cuff's compressed air so that the pressure drops 1 to 2 mmHg every second.

As shown in FIG. 1, when looking at the pressure waveform 140 of the cuff in the oscillometric method, the cuff pressure change according to the heartbeat is detected from the moment 110 when the pressure of the cuff is slightly higher than the systolic blood pressure. The lower waveform 150 of FIG. 1 is a waveform obtained by passing a signal of the cuff pressure waveform 140 through a high pass filter. According to the lower waveform 150 of FIG. 1, the high frequency component through which the cuff pressure passes the high pass filter HPF at the mean blood pressure point 120 shows the maximum value. This high frequency component can be seen that the waveform is observed up to a lower level of pressure past the diastolic blood pressure 130.

Therefore, the oscillometric method does not accurately measure diastolic and systolic blood pressure, but can measure only average blood pressure, and can only estimate diastolic blood pressure and systolic blood pressure based on the measured average blood pressure. Therefore, the oscillometric method has a problem that the systolic blood pressure and diastolic blood pressure cannot be accurately measured due to the error caused by the above estimation and the limitation of reproducibility.

Accordingly, the present invention has been made to solve the above problems, and to provide a blood pressure measurement method and a blood pressure monitor using the same that can accurately measure systolic and diastolic blood pressure.

Another object of the present invention is to provide a more reproducible blood pressure measuring method capable of measuring both systolic and diastolic blood pressure and a blood pressure monitor using the same.

Other objects of the present invention will be readily understood through the following description.

According to an aspect of the present invention for achieving the above object, the blood pressure measuring device is a pressure measuring the first and second measuring means for measuring the blood pressure change of the subject, the first measuring means and the second measuring means A pressure processor for adjusting, a signal processor for converting the blood pressure change information of the subject measured by the first measuring means and the second measuring means into first pulsation waveform information and second pulsation waveform information and the first pulsation waveform information And a processor configured to measure systolic and diastolic blood pressures of the subject by analyzing second pulsation waveform information, wherein the first measuring means and the second measuring means may be worn by the subject at a predetermined distance or more from each other.

After the first pulsation waveform is detected, the processor may determine the pressure of the second measuring means at the time when the second pulsation waveform is detected as the systolic blood pressure of the examinee.

The processor unit analyzes the first pulsation waveform or the second pulsation waveform to measure first or second measurement means at a time when an inflection point is detected after a maximum amplitude of the first pulsation waveform or the second pulsation waveform is detected. The pressure of the means can be determined by the diastolic blood pressure of the subject.

The diastolic blood pressure may be determined as the blood pressure at the time when the inflection point is detected by wavelet converting the first pulsation waveform or the second pulsation waveform.

The diastolic blood pressure may be determined as a blood pressure at the time when an inflection point is detected using a correlation function of the first pulsation waveform or the second pulsation waveform.

The first measuring means and the second measuring means may include a cuff worn on the upper arm of the subject.

The first measuring means and the second measuring means may include a first pressure sensor and a second pressure sensor for measuring respective pressures.

The pressure adjusting unit may include a pump for increasing the pressure of the first measuring means and the second measuring means, a pressure valve for adjusting the pressure provided by the pump, and reducing the pressure of the first measuring means and the second measuring means. It may include an exhaust device for.

The pressure adjusting unit may include a first pressure adjusting unit and a second pressure adjusting unit for independently adjusting the pressure of the first measuring unit and the second measuring unit.

The signal processing unit amplifies the blood pressure change information of the subject measured by the first measuring means and the second measuring means and passes the high pass filter to detect the high frequency component and the first pulsation waveform information and the second pulsation waveform. Can be converted into information.

The signal processing unit first signal processing unit and the second measurement to amplify the blood pressure change information of the subject measured by the first measuring means and converts the high-frequency components to the first pulsation waveform information detected through the high pass filter And a second signal processor for amplifying the blood pressure change information measured by the means and converting the blood pressure change information into the second pulsation waveform information detected through a high pass filter.

According to another aspect of the present invention, a method for measuring blood pressure of a subject comprises the steps of (a) increasing the pressure of the first measuring means and the second measuring means worn by the subject, (b) the first measuring means and the second measuring means; Lowering the pressure of the measuring means at a predetermined constant speed, (c) converting the pressure information continuously measured in each of the first measuring means and the second measuring means into corresponding first pulsating waveform information and second pulsating waveform information; And converting the first pulsation waveform information and the second pulsation waveform information to obtain systolic blood pressure and diastolic blood pressure of the subject.

In the step (a), the first measuring means and the second measuring means may be worn on the upper arm of the subject at a distance of more than a predetermined distance from each other.

In step (d), the systolic blood pressure of the subject may be determined by the pressure of the second measuring means at the time when the second pulsation waveform is detected after the first pulsation waveform is detected.

In step (d), the diastolic blood pressure of the subject is the pressure of the first measuring means or the second measuring means at the time when the inflection point is detected after the maximum amplitude of the first pulsation waveform or the second pulsation waveform is detected. Can be determined.

The diastolic blood pressure may be determined as the blood pressure at the time when the inflection point is detected by wavelet converting the first pulsation waveform or the second pulsation waveform.

The diastolic blood pressure may be determined as a blood pressure at the time when an inflection point is detected using a correlation function of the first pulsation waveform or the second pulsation waveform.

The first measuring means and the second measuring means may comprise a cuff.

According to another aspect of the present invention, a program of instructions that can be executed by a blood pressure measuring apparatus is tangibly implemented to perform a blood pressure measuring method of a subject, and a recording medium recording a program that can be read by the blood pressure measuring apparatus. (A) increasing the pressure of the first measuring means and the second measuring means, (b) lowering the pressure of the first measuring means and the second measuring means at a predetermined constant speed, and (c) the first measuring means. Converting the pressure information measured by each of the measuring means and the second measuring means into corresponding first pulsating waveform information and second pulsating waveform information, and (d) analyzing the first pulsating waveform information and the second pulsating waveform information. It can be a recording medium for performing the step of obtaining the systolic and diastolic blood pressure of the subject.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be denoted by the same reference numerals regardless of the reference numerals and redundant description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

2 is a view for explaining a blood pressure measuring method according to a preferred embodiment of the present invention.

2, in the blood pressure measuring method according to the present invention, the first cuff 210 and the second cuff 220 are worn on the upper arm of the subject. The first cuff 210 and the second cuff 220 may further include fixing means for fixing the upper cuff to the upper arm. Here, the first cuff 210 is positioned at a predetermined distance closer to the heart of the subject than the second cuff 220. The first cuff 210 and the second cuff 220 are connected to the blood pressure measuring device 300 and the connection tubes 230 and 240 for pressure control. The first cuff 210 and the second cuff 220 are pressure control and measurement means used to measure blood pressure, and thus the construction and material thereof will be apparent to those skilled in the art, and thus, further description thereof will be omitted.

Blood pressure measuring apparatus 300 of the present invention can accurately measure the systolic and diastolic blood pressure of the subject using the blood pressure information measured by the first cuff 210 and the second cuff 220. This will be described in more detail with reference to FIGS. 3A to 6.

3A and 3B are views for explaining the configuration of the pinch pressure measuring apparatus 300 according to an embodiment of the present invention.

3A and 3B, the blood pressure measuring apparatus 300 of the present invention measures systolic blood pressure and diastolic blood pressure of a subject by using pressure information measured by the first cuff 210 and the second cuff 220. . The blood pressure measuring apparatus 300 includes a first pressure sensor 310, a second pressure sensor 320, a pressure adjusting unit 330, a signal processor 360, and a blood pressure measuring unit 350.

The first pressure sensor 310 and the second pressure sensor 320 measure the pressure of the first cuff 210 and the second cuff 220 in correspondence with the first cuff 210 and the second cuff 220, respectively. It is a sensor. The first pressure sensor 310 and the second pressure sensor 320 measure the pressure of the first cuff 210 and the second cuff 220 to the first cuff 210 and the second by the blood pressure measuring unit 350. The pressure information of the cuff 220 is continuously transmitted.

The pressure regulator 330 is connected to a pressure valve 332 and a pressure valve 310 for adjusting the pressure on the first cuff 210 and the second cuff 220 by the control of the blood pressure measuring unit 350, and thus the blood pressure. An air pump operated by the control of the measuring unit 350 and injecting air into the first cuff 210 and the second cuff 220 to increase the pressure of the first cuff 210 and the second cuff 220 ( 333 and the air injected into the first cuff 210 and the second cuff 220 are exhausted under the control of the blood pressure measuring unit 350 to lower the pressure of the first cuff 210 and the second cuff 220. And an exhaust device 331. The exhaust device 331 exhausts the air injected into the first cuff 210 and the second cuff 220 in order to measure systolic and diastolic blood pressure of the subject, for example, 1 to 2 mmHg / The pressure of the first cuff 210 and the second cuff 220 is gradually reduced together at a speed of about a second.

As shown in FIG. 3A, the pressure adjusting unit 330 is connected to the connection valves 230 and 240 of the first cuff 210 and the second cuff 220 to simultaneously connect the first cuff 210 and the second cuff. The systolic blood pressure and diastolic blood pressure of the subject may be measured by adjusting the pressure of the cuff 220. In addition, as shown in FIG. 3B, the two pressure regulators 330 and 340 are connected to the connection valves 230 and 240 of the first cuff 210 and the second cuff 220, respectively. Corresponding to 210 and the second cuff 220, each pressure may be independently adjusted to measure systolic and diastolic blood pressures of the subject.

The signal processor 360 amplifies the pressure information measured from the first cuff 210 and the second cuff 220, passes the high pass filter, and converts the pressure information into a digital signal. To this end, the signal processor 360 converts the amplifier 361 which amplifies the measured pressure information, the high pass filter unit 362 which detects only the high frequency band pressure information from the amplified pressure information, and converts the analog pressure information into digital pressure information. And a digital converter 363 for computing and processing. The signal processor 360 amplifies the pressure information measured by the first cuff 210 and the second cuff 220, and outputs pressure information that detects a high frequency band from the amplified pressure information. In addition, the signal processor 360 bypasses the pressure information measured by the first pressure sensor 310 and the second pressure sensor 330 to transfer the pressure information to the blood pressure measuring unit 350 or transmits the amplified pressure information. Transfer to the blood pressure measuring unit 350. Here, the signal processor 360 may have a circuit configuration for bypassing the measured pressure information. In addition, the signal processor 360 may include a first signal processor and a second signal processor to independently perform signal processing corresponding to each of the first cuff 210 and the second cuff 220. Self-explanatory

The pinching pressure measuring unit 350 includes a memory unit 370 for storing the processed pressure information input from the signal processing unit 360 and a program for measuring blood pressure, a key input unit 375 for inputting a user's command for measuring blood pressure, And a display unit 380 on which the measured pressure of the examinee is displayed and a processor unit 390 for controlling each component of the blood pressure measuring device 300.

The blood pressure measuring unit 350 measures systolic blood pressure and diastolic blood pressure of the subject using pressure information corresponding to the first cuff 210 and the second cuff 220 and pulsation waveform information obtained by amplifying them and detecting high frequency bands. do. The blood pressure measuring unit 350 first measures the systolic blood pressure point and the diastolic blood pressure point of the subject using pulsation waveform information that detects a high frequency band, and the systolic blood pressure and diastolic blood pressure at the point of time measured using the corresponding pressure information. Can be measured.

The memory unit 370 stores signal-processed pressure information, and stores a program and data used to measure blood pressure of a subject. In addition, the memory unit 370 is a pulsation waveform of a high frequency component that detects a high frequency component of the amplified pressure information and the amplified pressure information amplified by the signal processing unit 360 the pressure information continuously measured in the pressure sensor 340 You can continue to save.

The key input unit 375 is a means for inputting a user's command for pressure measurement and display.

The display unit 380 may include a display device as a means for displaying the measured pressure information, and may further include a speaker device.

The processor 390 controls the respective constituent means of the blood pressure measuring device 300, and performs an operation for measuring the narrowing pressure of the subject. The processor unit 390 may be implemented using various microprocessors. The processor 390 may perform an operation for measuring systolic blood pressure and diastolic blood pressure of the subject using the stored detected pulsation waveform of the high frequency component.

Hereinafter, a method of accurately measuring systolic blood pressure, average blood pressure, and diastolic blood pressure of a subject using the blood pressure measuring apparatus 300 of the present invention will be described.

In the blood pressure measuring method according to the present invention, first, the first cuff 210 and the second cuff 220 are worn on the upper arm of the subject. The first cuff 210 and the second cuff 220 are connected to the blood pressure measuring device 300 and the connection tubes 230 and 240 to adjust the pressure of the first cuff 210 and the second cuff 220. .

The pressure controllers 330 and 340 adjust the pressures of the first cuff 210 and the second cuff 220, respectively, in order to accurately measure systolic and diastolic blood pressure of the subject. Here, the pressure adjusting units 330 and 340 may simultaneously adjust the pressures of the first cuff 210 and the second cuff 220, and may independently adjust the pressures of the first cuff 210 and the second cuff 220. The pressure regulators 330 and 340 drive the air pumps 333 and 343 connected to the first cuff 210 and the second cuff 220 and adjust the pressure valves 332 and 342 to sufficiently satisfy the systolic blood pressure of the subject. A high level, for example, pressurization up to 200 mmHg or more, causes the pressure of the first cuff 210 and the second cuff 220 to reach a level above systolic blood pressure. At this time, when the pressure is measured in the first cuff 210 and the second cuff 220, since the pressure of the cuff higher than the systolic blood pressure narrows the artery, no pulsation signal is detected in the waveform passing the high frequency component. The exhaust devices 331 and 341 gradually reduce the pressure of the first cuff 210 and the second cuff 220 at a constant speed, for example, a speed of about 1 to 2 mmHg / second. At the same time, the first pressure sensor 310 and the second pressure sensor 320 measure the pressure of the first cuff 210 and the second cuff 220.

The signal processor 360 amplifies the measured pressure information and continuously outputs pulsation waveform information of the high frequency component, which detects only the high frequency component from the amplified pressure information, to the blood pressure measuring unit 350. The pressure information 140 amplified from the pressure information measured by the first cuff 210 and the second cuff 220 and the pulsation waveforms 410 to 520 detecting only the high frequency component are as shown in FIGS. 4 to 5B. .

As shown in FIG. 4, after pulsation of the first cuff 210 is observed in the pulsation waveform in which only a high frequency component is detected from the pressure information measured by the first cuff 210 and the second cuff 220, the first cuff 210 is observed. The pulsation of the second cuff 220 is observed when the pressure of the cuff of the cuff 210 and the second cuff 220 is slightly lowered. The pressure of the cuff at the time when the pulsation of the second cuff 220 starts to be observed is measured by the systolic blood pressure. This will be described in more detail with reference to FIG. 4.

The blood pressure measuring device 300 measures the systolic blood pressure and then controls the exhaust device 330 to continuously lower the pressure of the first cuff 210 and the second cuff 220 at a constant speed. And the magnitude of the pulsation of the second cuff 220 is maximum. The processor unit 390 of the blood pressure measuring device 300 continuously calculates amplitudes of the pulsation waveforms of the first cuff 210 and the second cuff 220, and measures the maximum time point as the average blood pressure.

The blood pressure measuring device 300 continuously lowers the pressure of the first cuff 210 and the second cuff 220 at a constant speed after passing the maximum time point, and the first pressure sensor 310 and the second pressure sensor 320. The pressure information measured at and the pulsation waveform information obtained by amplifying it and detecting only high frequency components are continuously stored in the memory unit 370. The processor unit 390 analyzes the pressure information and the pulsation waveform information stored in the memory unit 370 to measure the systolic and diastolic blood pressure of the subject. In order to analyze the pulsating waveform information, the processor unit 390 detects a change point using wavelet transform, a discontinuity point detected using a correlation function, and a method of extracting an inflection point of each pulsating waveform. Activate the program to detect when Morphological Changes occur at low values of the stored waveform. Here, a method of detecting a change point using a wavelet transform and a method of detecting a discontinuity point using a correlation function are obvious to those skilled in the art, and thus description thereof will be omitted. The processor 390 may measure the blood pressure at the time when the Morphological Change occurs at a low value of the stored waveform as a diastolic blood pressure and output the blood pressure to the display unit 380. This will be described in more detail with reference to FIG. 5.

4 is a view showing a pulsation waveform for explaining the detection of systolic blood pressure in the narrowing pressure measuring method according to an embodiment of the present invention.

In the conventional oscillometric method, the heart beat is transmitted to the cuff at a high pressure before the cuff pressure reaches the diastolic blood pressure so that a pulsation of a high frequency component is observed. This pulsation is observed as the cuff pressure becomes greater as the systolic blood pressure passes and is maximized at the mean blood pressure. Therefore, in the case of measuring blood pressure by the oscillometric method, the systolic blood pressure cannot be determined by only one pulsation waveform.

The blood pressure measuring apparatus 300 according to the present invention wears the first cuff 210 and the second cuff 220 on the upper arm of the subject and focuses on the aforementioned points, and the first cuff 210 and the second cuff 220 are attached. The pressure of the pressure is higher than the systolic blood pressure to block the arteries, and then simultaneously withdraw the air from the first cuff 210 and the second cuff 220 at the same time, the first cuff 210 and the second cuff 220 Measure the pressure of). The pulsation waveform 410 of the first cuff and the pulsation waveform 420 of the second cuff of FIG. 4 measure the pressure of the first cuff 210 and the second cuff 220 and then pass the high-pass filter to pass the pulsation waveform. It is shown.

 The pulsation waveform 410 of the first cuff will be observed in the same shape as the waveform measured by the conventional oscillometric method, but the pulsation waveform 420 of the second cuff is transmitted by the first cuff 210 at a value above systolic blood pressure. Because it prevents the pulsating waveform that comes, the pulsation is transmitted from the point of systolic blood pressure and the shaking starts.

The blood pressure measuring apparatus 300 according to the present invention continuously measures the pressure signals of the first cuff 210 and the second cuff 220 and generates a pulsation waveform obtained by passing the measured pressure information through a high pass filter. The processor 390 analyzes the pressure of the second cuff 220 at the start of the oscillation in the pulsation waveform 420 of the second cuff as systolic blood pressure.

5A and 5B are diagrams showing pulsation waveforms for explaining diastolic blood pressure detection in a narrowing pressure measuring method according to an exemplary embodiment of the present invention.

In the conventional oscillometric method, despite the lower cuff pressure than the diastolic blood pressure, the diastolic blood pressure of the subject could not be measured because the heartbeat is continuously transmitted to the cuff. This is because the pressure of the cuff is lowered and the upper arm is not able to press on the artery of the cuff, but the heart beat is transmitted to the brachial artery with the part of the circumference of the cuff circumferentially extending to the brachial artery. This is because the pulsation of the artery is transmitted as a change in the pressure of the cuff when suspended by weight. For this reason, the pulsation waveform of the subject is detected even below the diastolic blood pressure, but the shape of the waveform is structurally different from the pulsation when the cuff pressure is above the diastolic blood pressure.

As shown in FIG. 5A, when the first cuff pulsation waveform 510 and the second cuff pulsation waveform 520 are gradually lowered beyond the average blood pressure when the pressure applied to the first cuff 210 and the second cuff 520 is reduced. The magnitude of the pulsation is observed to decrease as the size of the pulsation increases as the transmural pressure (difference between blood vessel pressure and cuff pressure) increases.

However, while the first cuff pulsation waveform 510 and the second cuff pulsation waveform 520 are similar in amplitude over the diastolic blood pressure, the amplitude decreases, whereas below the diastolic blood pressure, the waveform with the inflection point of the shape of the lower side of the pulsation is distorted. Is observed. Accordingly, the blood pressure measuring unit 350 may measure the diastolic blood pressure point of the subject through the signal processing analysis of the converted first cuff pulsation waveform 510 and the second cuff pulsation waveform 520, and the first pressure sensor ( The blood pressure at the diastolic pressure point measured using the pressure information transmitted from the 310 and the second pressure sensor 320 may be measured as the diastolic pressure. In this case, as described above, the first cuff pulsation waveform 510 and the second cuff pulsation are calculated to calculate the point of time at which the inflection point is formed in the converted first cuff pulsation waveform 510 and the second cuff pulsation waveform 520. Detection of the change point using the wavelet transform of the waveform 520, detection of the discontinuity point using the correlation function, a method of extracting the inflection point of each beat waveform. Since the above-described methods are obvious to those skilled in the art as methods used to detect the inflection point, description thereof will be omitted.

As shown in FIG. 5B, another method of more accurately detecting diastolic blood pressure may be performed by maintaining the pressure of the first cuff 210 in a state of 1 to 2 mmHg lower than the pressure of the second cuff 220. The pressure of the first cuff 210 and the second cuff 220 is lowered. In this case, two waveforms of the first cuff 210 and the second cuff 220 are analyzed at the same time, and the two waveforms may be compared to determine the timing at which the shape change occurs. . As described above, in order to detect the diastolic blood pressure, the pressure adjusting unit 330 may independently adjust the pressures of the first cuff 210 and the second cuff 220, as in the blood pressure measuring apparatus 300 shown in FIG. 3B. , 340 should be provided. In addition, as described above, the blood pressure measuring apparatus 300 may include a plurality of signal processing units 360 corresponding to each of the first cuff 210 and the second cuff 220.

 6 is a flowchart illustrating a blood pressure measuring method according to an embodiment of the present invention.

In step S610, as shown in FIG. 2, the first cuff 210 and the second cuff 220 are wrapped around the upper arm of the subject, and the pressure valve 310 is adjusted to provide an example of a level sufficiently higher than the systolic blood pressure of the subject. For example, by pressing to 200 mmHg or more, the artery of the upper arm of the subject wrapped by the 1st cuff 210 and the 2nd cuff 220 is pressed.

In operation S620, it is determined whether there is a change in pressure of the first cuff 210 and the second cuff 220 measured by the blood pressure measuring device 300. The systolic of the subject in the first cuff 210 and the second cuff 220 is determined. If the artery is constricted higher than blood pressure, no pulsation signal is detected in the waveform passing high frequency components. If the pressure change of the first cuff 210 and the second cuff 220 is detected, step S610 is performed again.

In operation S630, the blood pressure measuring apparatus 300 controls the exhaust apparatuses 331 and 341 to control the first cuff 210 and the second cuff 220 at a constant speed, for example, a speed of about 1 to 2 mmHg / sec. Gradually decrease the pressure together. At the same time, the first pressure sensor 310 and the second pressure sensor 320 measure the pressure of the first cuff 210 and the second cuff 220. In addition, the blood pressure measuring apparatus 300 amplifies the measured pressure information and measures the first cuff pulsation waveform 410 and the second cuff pulsation waveform 420 that detect only high frequency components through the high pass filter 362. do.

In steps S640 and S650, as shown in FIG. 4, after the first cuff pulsation waveform 410 is measured to observe the first cuff pulsation waveform 420, the second cuff pulsation waveform 410 is observed. The pressure of the cuff at the time when the pulsation of 220 starts to be observed is measured by the systolic blood pressure.

In steps S660 and S670, the blood pressure measuring apparatus 300 continuously lowers the pressure of the first cuff 210 and the second cuff 220 at a constant speed, so that the first cuff pulsation waveform 410 and the second cuff pulsation waveform ( 420) The maximum time point is measured by mean blood pressure.

In steps S680 and S690, the blood pressure measuring device 300 continuously lowers the pressure of the first cuff 210 and the second cuff 220 at a constant speed so that the first cuff pulsation waveform 410 and the second cuff pulsation waveform ( When the blood pressure reaches a level sufficiently lower than the systolic blood pressure, the first cuff pulsation waveform 510 and the second cuff pulsation waveform 520 stored up to this point are analyzed. The processor unit 390 analyzes the converted first cuff pulsation waveform 510 and the second cuff pulsation waveform 520 to detect a time point at which a morphological change occurs and measure the blood pressure at this time as a diastolic blood pressure. .

Through the above-described process, the blood pressure measuring apparatus 300 may obtain the systolic blood pressure, the average blood pressure, and the diastolic blood pressure as a measurement value rather than an estimation.

As described above, according to the blood pressure measuring apparatus and method according to the present invention, there is an effect that can accurately measure the systolic and diastolic blood pressure of the subject.

In addition, according to the blood pressure measuring apparatus and method according to the present invention, there is an effect that can measure the systolic and diastolic blood pressure of the subject to be reproducible.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and changes can be made.

Claims (19)

First and second measuring means for measuring a change in blood pressure of the subject; A pressure regulator for adjusting the pressure of the first and second measuring means; A signal processor for converting blood pressure change information of the subject measured by the first and second measurement means into first pulsation waveform information and second pulsation waveform information; And Including the processor for measuring the systolic blood pressure and diastolic blood pressure of the subject by analyzing the first pulsating waveform information and the second pulsating waveform information, The first measuring means and the second measuring means are worn by the examinee apart from each other by a predetermined distance or more, and the processor unit analyzes the first pulsation waveform or the second pulsation waveform to determine the first pulsation waveform or the second pulsation waveform. And a pressure of the first measuring means or the second measuring means at the time when the inflection point is detected after the maximum amplitude is detected as the diastolic blood pressure of the subject. The method of claim 1, And after the first pulsation waveform is detected, the processor determines the pressure of the second measuring means at the time when the second pulsation waveform is detected as the systolic blood pressure of the subject. delete The method of claim 1, The diastolic blood pressure is a blood pressure measuring device, characterized in that the wavelet transform the first pulsation waveform or the second pulsation waveform is determined as the blood pressure when the inflection point is detected. The method of claim 1, The diastolic blood pressure is a blood pressure measuring device, characterized in that determined by the blood pressure at the point of inflection point detected using a correlation function (Correlation Function) of the first pulsation waveform or the second pulsation waveform. The method of claim 1, And said first measuring means and said second measuring means comprise corresponding first cuffs and second cuffs, respectively. The method of claim 1, And said first measuring means and said second measuring means each comprise a pressure sensor for measuring pressure. The method of claim 1, The pressure control unit A pump for increasing the pressure of the first measuring means and the second measuring means; A pressurizing valve for regulating the pressure provided by the pump; And And an exhaust device for lowering the pressure of the first measuring means and the second measuring means. The method of claim 1, The pressure adjusting unit includes a first blood pressure measuring unit and a second pressure adjusting unit for independently adjusting the pressure of the first measuring unit and the second measuring unit. The method of claim 1, The signal processing unit amplifies the blood pressure change information of the subject measured by the first measuring means and the second measuring means and passes the high pass filter to detect the high frequency component and the first pulsation waveform information and the second pulsation waveform. Blood pressure measuring device, characterized in that converted to information. The method of claim 1, The signal processing unit, A first signal processor for amplifying the blood pressure change information of the subject measured by the first measuring means and converting the blood pressure change information into the first pulsation waveform information detected through a high pass filter; And And a second signal processor for amplifying the blood pressure change information of the subject measured by the second measuring means and converting the blood pressure change information into the second pulsation waveform information detected through a high pass filter. Device. In the method of measuring the blood pressure of the subject, (a) increasing the pressure of the first and second measuring means worn by the subject; (b) lowering the pressure of the first measuring means and the second measuring means at a predetermined constant speed; (c) converting pressure information continuously measured in each of the first measuring means and the second measuring means into corresponding first pulsating waveform information and second pulsating waveform information; And (d) analyzing the first pulsation waveform information and the second pulsation waveform information to obtain systolic blood pressure and diastolic blood pressure of the subject;  In step (d), the diastolic blood pressure of the subject is the pressure of the first measuring means or the second measuring means at the time when the inflection point is detected after the maximum amplitude of the first pulsation waveform or the second pulsation waveform is detected. Blood pressure measurement method characterized in that it is determined. The method of claim 12, In the step (a), the first measuring means and the second measuring means is a blood pressure measuring method, characterized in that worn on the upper arm of the subject separated by more than a predetermined distance from each other. The method of claim 12, In step (d) And the systolic blood pressure of the subject is determined by the pressure of the second measuring means at the time when the second pulsation waveform is detected, after the first pulsation waveform is detected. delete The method of claim 12, The diastolic blood pressure is a blood pressure measurement method characterized in that the wavelet transform the first pulsation waveform or the second pulsation waveform is determined as the blood pressure at the time when the inflection point is detected. The method of claim 12, The diastolic blood pressure is a blood pressure measurement method, characterized in that the blood pressure is determined when the inflection point is detected using a correlation function (Correlation Function) of the first pulsation waveform or the second pulsation waveform. The method of claim 12, And said first measuring means and said second measuring means comprise corresponding first cuffs and second cuffs, respectively. In the recording medium recording a program that can be read by the blood pressure measuring device is implemented programmatically by the blood pressure measuring device to perform the blood pressure measuring method of the subject, (a) increasing the pressure of the first and second measuring means; (b) lowering the pressure of the first measuring means and the second measuring means at a predetermined constant speed; (c) converting the pressure information measured by each of the first measuring means and the second measuring means into corresponding first pulsating waveform information and second pulsating waveform information; And (d) analyzing the first pulsation waveform information and the second pulsation waveform information to obtain systolic blood pressure and diastolic blood pressure of the subject; In step (d), the diastolic blood pressure of the subject is the pressure of the first measuring means or the second measuring means at the time when the inflection point is detected after the maximum amplitude of the first pulsation waveform or the second pulsation waveform is detected. A computer-readable recording medium recording a blood pressure measuring method, characterized in that determined.

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