KR101283798B1 - Apparatus and method for automatic measurement of blood pressure values based on oscillometric method and korotkoff sounds method - Google Patents

Abstract

PURPOSE: Automatic blood pressure measurement instrument and method simultaneously using oscillometric method and Korotkoff sound method are provided to increase accuracy by removing dynamic noise and arrhythmia. CONSTITUTION: A pressurization step is performed (110). A normal signal section is detected with a Korotkoff sound method (120). A decompression step is performed (130). Intensity of a normal signal is measured with an oscillometric method (140). Blood pressure related information is determined based on the intensity of a normal signal (150). [Reference numerals] (110) Pressurization step; (120) Normal signal section detection step; (130) Decompression step; (140) Normal signal size measurement step; (150) Blood pressure training information desicion step; (AA) Start; (BB) End

Description

Apparatus and Method for automatic measurement of blood pressure values based on oscillometric method and Korotkoff sounds method}

The present invention relates to a method for measuring blood pressure of a human body and an apparatus for performing the method, and to a method and apparatus for measuring blood pressure in parallel with an oscillometric method and a Korptoff sound method.

 Prior art automatic blood pressure monitors calculate blood pressure values using an oscillometric method.

The oscillometric method applies pressure to an air pocket inserted into the cuff wound around the upper arm and gradually reduces the pressure. The arterial pressure generated by the contraction movement from the heart is transmitted to the upper arm, and the cuff air wound around the upper arm. The arterial pressure is delivered to the pocket and the magnitude of the arterial pressure is simultaneously detected to correspond to the pressure in the cuff's air pocket.The pressure value in the air pocket where the constant arterial pressure is located based on the largest arterial pressure is the highest and lowest The method of calculation.

 However, the method may make unexpected errors because the accuracy of blood pressure values is due to clinical trial data. In addition, since all the arterial pressures must be monitored, movement may occur in the target body (hereinafter, referred to as dynamic noise) during measurement, or a fatal error may occur when the target body is an arrhythmia patient.

As another prior art, the physician uses the Korktoff method when measuring blood pressure in a manual manner rather than in an automatic manner.

Cortkov sound method is a method of connecting the mercury system and the cuff, applying pressure, and slowly releasing the pressure. The stethoscope is placed on the lower brachial artery of the upper arm where the cuff is wound. The method of calculating the pressure value indicated by the mercury system at the first occurrence and disappearance of the sound generated when the blood with the generated physical force rubs against the arterial wall, that is, the Korktoff sound, is the highest blood pressure and the lowest blood pressure, respectively. to be. In fact, many doctors and nurses detect blood pressure values using the above methods and trust them in the correct way.

Therefore, by applying the Cortkov sound method to the automatic blood pressure meter to the conventional oscillometric method, the error that the automatic blood pressure meter using only the conventional oscillometric method can be made, that is, when dynamic noise occurs during measurement or arrhythmia patient, The need to monitor arterial pressure requires techniques that improve the accuracy and reliability of potentially fatal errors.

The present invention provides a method and apparatus for measuring blood pressure in parallel with the Cortkov sound method in order to increase the accuracy more than the prior art that was used to measure blood pressure using only the oscillometric method in the blood pressure measuring device.

In the method of measuring blood pressure of the human body, the oscillometric method and the Cortkov sound method are used in parallel, the Cortkov sound method is used as the primary measurement method, and the oscillometric method is used as the secondary measurement method. It provides a method and apparatus for measuring.

In the blood pressure measurement method according to an embodiment of the present invention, the step of injecting air into the cuff and pressurizing, detecting the normal signal section by the Cortkov sound method in the pressing process, by decompressing the air by discharging the cuff The method may include measuring the normal signal magnitude during the normal signal period in an oscillometric manner during the decompression, and determining blood pressure related information based on the normal signal magnitude.

According to one side, the step of measuring the normal signal magnitude during the normal signal interval, the normal signal interval is a section in which the cuff pressure is greater than the pressure at which the Cortkop sound occurred and less than the pressure at which the Cortkop sound disappeared, A blood pressure measuring method is provided, wherein the magnitude of the normal signal is obtained only in the normal signal section.

According to the other side, the step of measuring the normal signal magnitude during the normal signal interval, the normal signal interval is redundant before and after a section where the cuff pressure is greater than the pressure at which the Cortkop sound occurred and the Cortkop sound disappeared. The interval is added to the interval, and the blood pressure measuring method is provided, wherein the magnitude of the normal signal is obtained only in the normal signal interval.

According to another one side, the step of pressing the pressure is automatically pressurized air, the step of reducing the pressure is provided with a blood pressure measuring method characterized in that the air is automatically exhausted.

According to another aspect, the blood pressure measuring method may further include outputting the blood pressure related information, and storing the blood pressure related information.

An apparatus for measuring blood pressure according to another embodiment of the present invention includes an air pressure driving unit for injecting air into a cuff and pressurizing it, a contact type microphone for detecting a Cortkov sound in the pressurizing process, and decompressing air by discharging air from the cuff. An exhaust drive unit configured to detect a normal signal section based on the detected pressure sensor and a pressure sensor measuring an amplitude of a pressure and a normal signal in an oscillometric manner in the depressurizing process, and the detected Cortkov sound, And a blood vessel energy information detector configured to control the pressure sensor to measure a magnitude of a signal, and determine blood pressure related information based on the magnitude of the normal signal.

According to one side, according to the control command of the blood vessel energy information detection unit, the pressure sensor is the normal signal section is greater than the pressure at which the Cortkop sound occurred and less than the pressure at which the Cortkop sound disappeared, the normal Provided is a blood pressure measuring device, which obtains the magnitude of the normal signal only in a signal section.

According to the other side, according to the control command of the blood vessel energy information detection unit, the pressure sensor is a spare section in the section of the normal signal is greater than the pressure at which the Cortkop sound occurred and less than the pressure at which the Cortkop sound disappeared. Is added to the interval, and the blood pressure measuring device is provided, wherein the magnitude of the normal signal is obtained only in the normal signal interval.

According to another side, the air pressure driving unit is automatically injecting air into the cuff, the exhaust drive unit is provided with a blood pressure measuring device, characterized in that to automatically discharge the air.

According to another aspect, a blood pressure measuring device further includes an output unit indicating the blood pressure related information.

According to another aspect, a blood pressure measuring device further includes an input unit for allowing a user to control the blood pressure measuring device.

According to another aspect, a blood pressure measuring device further includes a storage unit for storing the blood pressure related information.

According to another aspect, the contact type microphone is provided with a blood pressure measuring device, characterized in that the condenser type.

According to one embodiment of the present invention, when measuring the blood pressure of the human body, it is possible to improve the accuracy and reliability of the blood pressure measurement method by avoiding fatal error that can be committed in the prior art.

In particular, it is possible to obtain a normal signal section relatively easily by the Cortkov sound method, and to measure the blood pressure by applying an oscillometric method only in the normal signal section, thereby removing the dynamic noise and arrhythmia to more accurately measure the blood pressure of the target human body. .

1 is a flowchart of measuring a blood pressure in parallel with the Korptoff sound method and the oscillometric method according to an embodiment of the present invention.
2 is a graph showing a method of applying the Korptoff sound method and the oscillometric method in detail according to an embodiment of the present invention.
3 is a diagram schematically illustrating a relationship between a human body, a cuff, and a blood pressure measuring device according to an embodiment of the present invention.
4 is a diagram schematically illustrating a relationship between a blood pressure measuring device, a microphone, an exhaust driving unit, a pressure sensor, a blood vessel energy information detection unit, an output unit, an input unit, and a storage unit.
5 is a view showing another example of the relationship between the cuff and the blood pressure measuring device.
6 is a view showing still another example of the relationship between the cuff and the blood pressure measuring device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart of measuring a blood pressure in parallel with the Korptoff sound method and the oscillometric method according to an embodiment of the present invention. The blood pressure measuring method according to the present embodiment may be performed by a blood pressure measuring apparatus.

In step 110, the blood pressure measuring device injects air into the cuff to increase the pressure. At this time, the blood must not be able to pass through the blood vessels, so the pressure is increased to a pressure level that is no longer detected.

Subsequently, during the pressing in the pressing step 110 in the normal signal section detecting step 120, the blood pressure measuring device detects the normal signal section based on the pressure in the section in which the Kortkov sound is detected.

In operation 130, the blood pressure measuring device discharges air to reduce the pressure. In this case, the time length of the normal signal section must be increased for accurate blood pressure measurement, and thus the rate of discharging air is slower than that of injecting air in the pressurizing step.

Subsequently, in the normal signal magnitude measuring step 140, the magnitude of the normal signal is measured during the normal signal period in the blood pressure measuring device. Herein, the normal signal refers to arterial pressure transmitted to the upper arm, and may be transmitted by a cuff and measured by the blood pressure measuring device.

In the blood pressure related information determination step 150, the maximum / lowest blood pressure, pulse rate, and the like are measured through a conventional measurement algorithm based on measured information such as the time length of the normal signal section, the magnitude of the normal signal, and the period of occurrence of the blood sound. Blood pressure related information may be determined by the blood pressure measuring apparatus.

2 is a graph showing a method of applying the Korptoff sound method and the oscillometric method in detail according to an embodiment of the present invention.

In the blood pressure measurement method of the present embodiment, a step of detecting a normal signal section by a Korktoff sound method while pressurizing and injecting air into the air bag inside the cuff 230 and measuring the magnitude of the normal signal by an oscillometric method while depressurizing The step 240 can be divided into two steps.

First, the pressure 201 of the cuff gradually increases during pressurization in the detecting step 230, and the pressure 201 of the cuff is greater than the pressure 210 at the point where the Cortkop sound 203 occurs. The blood vessel energy information detection unit 401 of FIG. 4 determines the normal signal sections 241 and 244 based on the section 231 smaller than the pressure 220 at the point where the Rtkov sound 203 does not occur. Herein, the normal signal sections 241 and 244 are the pressure section 241 between the pressure magnitude 210 of the cuff at the time when the Kortkop sound appears and the pressure magnitude 220 of the cuff at the time when the Cortkop sound disappears. Or the interval 244 to which the extra intervals 242 and 243 are added.

Subsequently, in the measuring step 240, the point where the Cortkop sound 203 occurs from the point where the pressure 202 of the cuff is equal to the pressure 220 at the point where the Cortkop sound 203 does not occur. Blood pressure may be measured by detecting a normal signal 204 in the artery through a pressure sensor during an interval 241 up to a pressure 210 point of the pressure sensor. In this case, the blood pressure may be measured by an oscillometric method during the interval 244 in which the extra intervals 242 and 243 are added to the interval 241 in order to correct an error in the blood pressure measurement by the Cortkov sound method.

3 is a diagram schematically illustrating a relationship between an arm 390, a cuff 310, and a blood pressure measuring apparatus 300 of a human body in one embodiment of the present invention. The cuff 310 is wrapped around the arm 390 of the human body, and the blood pressure is measured according to the flowchart of FIG. 1. Here, the line 350 connecting the blood pressure measuring device 300 and the cuff 310 may be composed of a wire and an air hose. However, the wires are not necessarily limited and can be replaced by wireless data transmission technology. In addition, the output unit 306 and the input unit 304 are shown as an electronic display and a button, respectively, but is not limited thereto.

4 shows a blood pressure measuring device 400, a microphone 420, an exhaust driver 403, a pressure sensor 430, a blood vessel energy information detector 401, an output 406, an input 404, and a storage 405. Is a diagram schematically illustrating the relationship between

The blood vessel energy information detector 401 receives the normal signal section and the magnitude of the normal signal from the microphone 420 and the pressure sensor 430, and calculates information related to blood pressure such as maximum / lowest blood pressure, average blood pressure, and pulse rate through a measurement algorithm. can do. In addition, the operation of the blood pressure measuring apparatus 400 may be started or terminated by receiving a command from the input unit 404, the information related to the blood pressure may be stored in the storage unit 405, or the stored information may be retrieved. ) May output the information related to the blood pressure.

The pressurization driver 402 and the exhaust driver 403 increase or decrease the pressure of the cuff by injecting or discharging air under the control of the blood vessel energy information detector 401. Since the pressure driving unit 402 and the exhaust driving unit 403 are not necessarily limited to separate modules, the pressure driving unit 402 and the exhaust driving unit 403 may be one module, and may be configured to inject or discharge air automatically or manually.

The input unit 404 may allow the user to give a command to the blood vessel energy information detection unit 401 such as operation start, emergency stop, output of the measured blood pressure or stored related blood pressure information of the blood pressure measuring device 400. The input unit 404 is not limited to a button, and a touch, a touch screen, a jog dial, a switch, and all other input devices may be used.

The storage unit 405 is a medium capable of storing the blood pressure related information under the control of the blood vessel energy information detection unit 401, and may store a conventional algorithm for measuring blood pressure using an oscillometric method. It may be a server that is not limited to a hard disk and a memory but stored using electronic communication.

The output unit 406 indicates blood pressure related information or device state information under the control of the blood vessel energy information detection unit 401. The output unit may be an electronic display such as an LCD, an LED, an OLED, a PDP, a touch screen, and the like, but is not limited thereto and may be a physical output device such as a printer or a facsimile.

The microphone 420 is a contact-type microphone, which is a sound sensor for detecting a corkkop sound and detecting a normal signal section. Cortkov sounds detected by the microphone 420 may be transmitted to the blood vessel energy information detector 401 to detect the normal signal section. Here, the contact type microphone used in the embodiment of the present invention may be a piezo method and a condenser method.

The pressure sensor 430 may sense the pressure of the cuff and the magnitude of the normal signal from the artery. The sensed pressure of the cuff and the magnitude of the normal signal are transmitted to the blood vessel energy information detector 401 and used to calculate information related to blood vessels such as high / low blood pressure, average blood pressure, and pulse rate.

5 is a diagram illustrating another example of the relationship between the cuff 510 and the blood pressure measuring device 530. The air bag 511 is mounted inside the cuff 510, but is not limited thereto. The shape and position of the microphone 520 and the pressure sensor 530 are also not limited thereto. In the embodiment of the present invention, the electronic display may be used as the output unit 506 to represent the highest / lowest blood pressure.

6 is a diagram illustrating still another example of the relationship between the cuff 610 and the blood pressure measuring device 600. The air bag 611, the microphone 620, and the pressure sensor 630 are not limited to the shape and position illustrated in FIG. 5. In embodiments of the present invention, the highest / lowest blood pressure can be printed on paper, in particular using a printer as a physical output device. Regularly managing blood pressure is especially important for patients with arrhythmia or hypertension, so it is necessary to record on physical media such as paper rather than temporarily displaying it on an electronic display.

Embodiments according to the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

400: blood pressure measuring device
401: blood vessel energy information detection unit
402: pressure drive unit
403: exhaust drive unit
404: input unit
405: storage unit
406: output unit
420: microphone
430: pressure sensor

Claims (14)

In the blood pressure measuring method,
Pressurizing;
Detecting a normal signal section by a Kortkov sound method in the pressing process;
Depressurizing;
Measuring a normal signal magnitude during the normal signal interval in an oscillometric manner in the decompression process; And
Determining blood pressure related information based on the normal signal magnitude
Blood pressure measuring method comprising a. The method of claim 1,
Measuring the normal signal level during the normal signal period,
The normal signal section is a section in which the cuff pressure is greater than the pressure at which the Cortkop sound occurred and less than the pressure at which the Cortkop sound disappeared,
Blood pressure measurement method, characterized in that for obtaining the magnitude of the normal signal only in the normal signal interval. The method of claim 1,
Measuring the normal signal level during the normal signal period,
The normal signal section is a section in which an extra section is added before and after a cuff pressure is greater than a pressure at which the Cortkop sound is generated and less than a pressure at which the Cortkop sound disappears,
Blood pressure measurement method, characterized in that for obtaining the magnitude of the normal signal only in the normal signal interval. 4. The method according to any one of claims 1 to 3,
The pressurizing step is to pressurize the air automatically,
The depressurizing step is a method for measuring blood pressure, characterized in that to automatically exhaust the air. 4. The method according to any one of claims 1 to 3,
Outputting the blood pressure related information; And
And storing the blood pressure related information. In the blood pressure measuring device,
An air pressure driving unit for injecting air into the cuff and pressing the air;
A contact type microphone for detecting a Cortkov sound in the pressing process;
An exhaust drive unit configured to discharge air from the cuff to reduce pressure;
A pressure sensor measuring pressure and a normal signal magnitude in an oscillometric manner in the depressurizing process; And
A blood vessel that detects a normal signal section based on the detected Cortkov sound, controls the pressure sensor to measure the normal signal level during the normal signal section, and determines blood pressure related information based on the normal signal size. Energy information detector
Blood pressure measuring device comprising a. The method according to claim 6,
According to the control command of the blood vessel energy information detection unit, the pressure sensor,
The normal signal section is a section that is larger than the pressure at which the Cortkop sound is generated and smaller than the pressure at which the Cortkop sound disappears,
Blood pressure measuring device, characterized in that for obtaining the magnitude of the normal signal only in the normal signal interval. The method according to claim 6,
According to the control command of the blood vessel energy information detection unit, the pressure sensor,
The normal signal section is a section in which an extra section is added to a section larger than the pressure at which the Korkkop sound is generated and smaller than the pressure at which the Korkkop sound is lost,
Blood pressure measuring device, characterized in that for obtaining the magnitude of the normal signal only in the normal signal interval. 9. The method according to any one of claims 6 to 8,
The air pressure driving unit automatically injects air to the cuff, the exhaust drive unit is characterized in that the discharge of air automatically. 9. The method according to any one of claims 6 to 8,
Blood pressure measuring apparatus further comprising an output unit for indicating the blood pressure-related information. 9. The method according to any one of claims 6 to 8,
The blood pressure measuring device further comprises an input unit for allowing a user to control the blood pressure measuring device. 9. The method according to any one of claims 6 to 8,
And a storage unit for storing the blood pressure related information. 9. The method according to any one of claims 6 to 8,
The contact type microphone is a blood pressure measuring device, characterized in that the condenser method. A computer readable medium comprising an instruction for controlling a blood pressure measuring device to measure blood pressure, the command comprising the steps of: pressurizing, detecting a normal signal section in the manner of Cortkov sound during the pressing; And depressurizing, measuring a normal signal magnitude during the normal signal period in an oscillometric manner during the decompression process, and determining blood pressure related information based on the normal signal magnitude. A computer readable medium for controlling the blood pressure measuring device.

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