KR101892295B1 - Blood pressure mesuring method using oscillometric method and blood pressure monitor using the same - Google Patents

Abstract

A blood pressure measuring method and a blood pressure meter using the same are disclosed. The sphygmomanometer according to the present invention comprises a cuff for applying pressure, a first sensor and a second sensor spaced apart from each other in the cuff portion to detect a change in pressure of each of the blood vessels, And a blood pressure value determination unit for determining a systolic blood pressure and a diastolic blood pressure based on the signal pattern of the sensed pressure. According to this configuration, the accuracy of the blood pressure measurement can be improved, and the user can easily measure the blood pressure alone.

Description

TECHNICAL FIELD [0001] The present invention relates to a blood pressure measuring method using an oscillometric method, and a blood pressure measuring apparatus using the blood pressure measuring method.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blood pressure measurement method and blood pressure monitor using the same, and more particularly, to a blood pressure measurement method using an oscillometric method to improve accuracy and a blood pressure monitor using the same.

Until now, there are mercury sphygmomanometers, aneroid sphygmomanometers, and electronic sphygmomanometers. Among them, the mercury sphygmomanometer is superior in the accuracy of the measurement and the performance in the coincidence drawing.

The mercury sphygmomanometer has been developed more than 150 years ago and has become a standard for blood pressure measurement since it was applied to clinical practice more than 100 years ago. The mercury sphygmomanometer consists of a cuff wrapped around an arm or leg, an air pump that can apply pressure to the cuff, and a mercury pressure gauge that measures the pressure. Define the systolic pressure at which the sound of the blood is heard while listening to the Korotkoff sound with the stethoscope while gradually decreasing the pressure so that the blood does not flow by a certain amount of pressure, The diastolic pressure is defined as the point at which the sound of the blood flow is not heard. Mercury sphygmomanometers have the disadvantage that not only mercury can affect the environmental pollution but also there is a possibility of deviation by the measurer and it can not be easily measured by the patient alone.

In order to overcome these shortcomings, an electronic blood pressure monitor that can be easily measured by a patient has been developed. Typically, there are Korotkoff method and Oscillometric method.

The earliest electronic sphygmomanometer in the mid-1970s used a mercury sphygmomanometer to measure the systolic blood pressure and diastolic blood pressure as a sensor to detect Korotkoff sounds. This method is very effective in the case of infants when there is room to mix noise in the corotor cuff band, such as when the ambient noise is large, or when there is motion artifact due to muscle motion, and when the systolic blood pressure and diastolic blood pressure are very large There is an error.

In the late 1980s, an oscillatory method was developed as an alternative to the Korotkov method. In this method, pressure due to blood flow to the arterial blood vessels is transferred to the cuff, resulting in minute pressure changes within the cuff. This signal is called an oscillometric signal, and the systolic blood pressure and diastolic blood pressure are obtained from this signal, which is the method currently employed by most sphygmomanometers. Although this method improved the noise, there were disadvantages that the measurement accuracy was lower than that of the mercury sphygmomanometer due to various errors such as the elasticity of the cambium, the pulse, the cuff material, and the state.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a blood pressure measuring method and a blood pressure monitor using the same, which can easily measure blood pressure while improving the accuracy of blood pressure measurement.

According to an aspect of the present invention, there is provided a blood pressure monitor including: a cuff for applying pressure; A first sensor and a second sensor which are spaced apart from each other in the cuff portion to detect a change in pressure of each of the blood vessels; And a blood pressure value determination unit that determines a systolic blood pressure and a diastolic blood pressure based on a signal pattern of a pressure sensed by the first sensor and the second sensor.

The blood pressure value determining unit may determine the systolic blood pressure to be a pressure applied at the cuff at a time when the signal sensed by the first sensor and the signal sensed by the second sensor show a difference at regular time intervals.

The blood pressure value determining unit may determine the diastolic blood pressure to be the pressure applied at the cuff portion at a time when the difference between the signal sensed by the first sensor and the signal sensed by the second sensor disappears after the systolic blood pressure is determined .

The cuff portion can gradually reduce the pressure to a predetermined minimum pressure after applying the predetermined maximum pressure.

And a data conversion unit converting a pressure signal sensed by the first sensor and the second sensor into a digital signal.

And a display unit for displaying the systolic blood pressure and the diastolic blood pressure determined by the blood pressure value determination unit to the user.

According to another aspect of the present invention, there is provided a blood pressure measuring method comprising: applying a predetermined maximum pressure to a user's body through a cuff; Sensing a pressure change at a first point and a second point of the blood vessel in the user's body while gradually reducing the pressure of the cuff portion; And determining a systolic blood pressure and a diastolic blood pressure based on a signal pattern of the sensed pressure at the first point and the second point, wherein the first point and the second point are in contact with the cuff portion And may be a point spaced from the user's body part.

In addition, the determining step may determine the systolic blood pressure by determining the pressure of the cuff part at a time when a signal sensed at the first point and a signal sensed at the second point show a difference in a predetermined time interval.

The determining step may determine the diastolic blood pressure by determining the pressure of the cuff part at a time when the difference between the sensed signal at the first point and the sensed signal at the second point disappears after the systolic blood pressure is determined have.

And displaying the determined systolic blood pressure and diastolic blood pressure to the user.

According to the blood pressure measurement method and the blood pressure monitor using the blood pressure measurement method according to the present invention, accuracy of blood pressure measurement can be improved and the user can easily measure the blood pressure alone.

1 is a configuration diagram showing the configuration of a blood pressure monitor according to an embodiment of the present invention;
FIG. 2 is a flowchart showing a procedure of a blood pressure measurement method according to an embodiment of the present invention,
FIGS. 3 and 4 are views for explaining a blood pressure measurement method according to an embodiment of the present invention;
5 is a view for explaining a method of determining a systolic blood pressure in a blood pressure measuring method according to an embodiment of the present invention,
FIG. 6 is a view for explaining a method for determining diastolic blood pressure in the blood pressure measuring method according to the embodiment of the present invention. FIG.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a block diagram showing the configuration of a blood pressure monitor according to an embodiment of the present invention. The blood pressure monitor 100 according to an embodiment of the present invention includes a cuff 110, a first sensor 120, a second sensor 121, a data conversion unit 130, a blood pressure value determination unit 140, 150).

The cuff portion 110 has a function of applying pressure to the user's body. Specifically, the cuff 110 is placed near the upper arm of the user and presses the blood vessel at a higher pressure than the systolic blood pressure to block blood vessels in the brachial region. Then, the pressure is gradually reduced, and the pressure of the cuff 110 is determined at a specific point To the blood pressure value determining unit 140 to be described later.

The first sensor 120 and the second sensor 121 have a function of sensing a pressure of a blood vessel by falling apart at a predetermined interval at a portion where the cuff 110 is in contact. The first sensor 120 and the second sensor 121 may be composed of a piezoelectric element capable of sensing a pressure.

The point where the first sensor 120 is placed is a portion closer to the heart at a position where the cuff portion 110 is placed and the point at which the second sensor 121 is placed is a point where the cuff portion 110 is placed, And the first sensor 120 and the second sensor 121 are preferably disposed in a straight line.

The data conversion unit 130 converts the pressure sensed by the cuff 110 or a signal sensed by the sensors 120 and 121 into a digital signal and transmits the digital signal to the blood pressure value determination unit 140. When the function of the data conversion unit 130 is included in the blood pressure value determination unit 140, the configuration of the data conversion unit 130 may not be separately provided.

The blood pressure value determining unit 140 has a function of determining the systolic blood pressure and the diastolic blood pressure. Systolic blood pressure is the pressure of the blood vessels when the heart contracts and sends blood to the arteries with a strong force. In other words, systolic blood pressure means the maximum value of the blood pressure during the cycle of the heart, and may be referred to as the maximum blood pressure, the systolic blood pressure, and the like. Diastolic blood pressure, on the other hand, refers to the arterial blood pressure of the diastolic. In other words, diastolic blood pressure means the lowest value of the blood pressure during the cycle of the heart, and may be referred to as the minimum blood pressure, the lowest blood pressure, and the diastolic blood pressure.

The blood pressure value determination unit 140 determines the pressure applied from the cuff unit 110 at a time when the signal sensed by the first sensor 120 and the signal sensed by the second sensor 121 show a difference at regular time intervals The systolic blood pressure is determined. The time at which the difference between the signal sensed by the first sensor 120 and the sensed signal sensed by the second sensor 121 disappears while the pressure is continuously reduced in the cuff 110 after the systolic blood pressure is determined, The blood pressure is determined, and the pressure applied at the cuff portion at this time is determined as the diastolic blood pressure. The blood pressure value determining unit 140 can easily determine the systolic blood pressure and diastolic blood pressure based on the sensed signals from the first sensor 120 and the second sensor 121 and the pressure value applied from the cuff 110 do. How the above operation is performed will be described in more detail with reference to FIGS. 3 to 6. FIG.

The display unit 150 has a function of displaying the systolic blood pressure and the diastolic blood pressure determined by the blood pressure value determination unit 140 to the user. However, the configuration of the display unit 150 may be omitted if necessary, and the data relating to the systolic blood pressure and the diastolic blood pressure determined by the blood pressure value determination unit 140 may be transmitted to an external device or the like via a communication unit (not shown) It is also possible to transmit to the system.

2 is a flowchart showing a procedure of a blood pressure measurement method according to an embodiment of the present invention.

First, the pressure is applied through the cuff (S200). The pressure applied here can be preset by the user and will be higher than the hypertension. Thereafter, the applied pressure is gradually reduced (S210), and the pressure signal at the first point and the second point is sensed. Then, it is determined whether the first point sensing signal and the second point sensing signal are displayed with a predetermined time difference based on the sensed result (S220).

If the difference does not show at a constant time interval (S220-NO), the pressure is continuously reduced (S210). However, when the difference starts to appear at a predetermined time interval (S220-YES), the time is determined as the systolic blood pressure, and the cuff pressure at the time of the difference is determined (S230).

After the systolic blood pressure is determined, the pressure reduction is continued (S240), and the pressure signals at the first point and the second point are continuously sensed. If the time difference between the first point sensing signal and the second point sensing signal does not disappear (S250-NO), the decompression is continued (S240).

If the sensing signals showing a difference in a predetermined time interval show a signal pattern in which the time difference disappears (S250-YES), the cuff pressure at the time point at which the time difference disappears is determined as the diastolic blood pressure, and the cuff pressure at that time is determined S260).

Then, the systolic blood pressure determined in step S230 and the pressure determined in step S260 are determined as the diastolic blood pressure values (S270), and the determined systolic blood pressure and diastolic blood pressure values are displayed to the user (S280).

According to the method for measuring blood pressure according to the embodiment of the present invention, the user can conveniently measure the blood pressure by using only two sensors.

Hereinafter, the method for determining the systolic blood pressure and the diastolic blood pressure in the blood pressure monitor and the blood pressure measuring method described above with reference to FIGS. 3 to 6 will be described in more detail.

FIG. 3 is a graph showing a graph of the sphygmomanometer and a sphygmomanometer by comparing the sphygmomanometer pressure and the diastolic blood pressure with each other.

In FIG. 3, the ① region is a region where the cuff pressure is higher than the SYSTOLIC blood pressure, the ② region is the region between the SYSTOLIC blood pressure and the DIASTOLIC blood pressure region, and the ③ region is the diastolic blood pressure The pressure of the cuff is lower.

The cuff 110 is located at the upper arm of the user and the first sensor 120 indicated by A and the second sensor 121 indicated by B are located on the same straight line in the cuff 110. [ The points P, Q, R, and S represent the progress of blood flow, that is, the portion where the blood passes through the artery and the pressure is sensed. To explain the method of determining the systolic blood pressure and the diastolic blood pressure through FIGS. Are arbitrarily shown.

FIG. 4 is a graph showing blood flow waves in the section (1) of FIG. 3 and signal patterns in the respective sensors 120 and 121.

Since the pressure of the cuff is higher than the systolic blood pressure in the ① section, the blood can not move from the artery to the fingertip and moves to the P point. This is shown in FIG. 4 as a graph. That is, at the point P, a blood flow wave is detected, but the signals are hardly sensed in the first sensor 120 and the second sensor 121.

However, since the blood flow pressure at the point P vibrates the cuff, a weak signal can be detected at the first sensor 120 and the second sensor 121 as shown in FIG.

FIG. 5 is a graph showing blood flow waves in the second section in FIG. 3 and signal patterns in the respective sensors 120 and 121. FIG. In section 2, the pressure in the cuff is smaller than the systolic blood pressure and higher than the diastolic blood pressure, so the blood moves along the artery, so blood flow is detected at points P, Q, R, That is, the signal will move along positions P, Q, R, and S as shown in FIG.

At this time, in the first sensor 120 located on the point Q and the second sensor 121 located on the point R, a large signal is detected when the blood flow wave is located at the Q point and the R point. 4, signals are hardly sensed by the first sensor 120 and the second sensor 121, and signals sensed by the first sensor 120 and the second sensor 121 are spaced at regular intervals It starts to show. Then, the cuff pressure at this time becomes the systolic blood pressure, which is a portion indicated by the dotted line between the section (1) and the section (2) in FIG.

The graph of FIG. 5 continues a similar pattern until the ②th section of FIG. 3 passes. However, the signal of another pattern is shown in the section ③ of FIG.

FIG. 6 shows the signal in the section (3). That is, since the pressure of the cuff is lower than the diastolic blood pressure in the period (3), signals are not sensed to the first sensor 120 and the second sensor 121. This is because the blood flow passes through points P, Q, R, and S without any resistance. That is, in this area, there is no difference in signals between the first sensor 120 and the second sensor 121.

When the diastolic blood pressure is determined using the above, signals are sensed by the first sensor 120 and the second sensor 121 at predetermined time intervals as shown in FIG. 5, . This refers to a portion indicated by a dotted line between the interval (2) and the interval (3) in FIG. That is, the diastolic blood pressure is determined as the pressure in the cuff when the difference between the signals sensed by the first sensor 120 and the second sensor 121 disappears, as shown in FIG.

In the above description, the sphygmomanometer employing two sensors and the blood pressure measurement method using two sensors are assumed, but it goes without saying that three sensors or a greater number of sensors may be used.

In the above description, components necessary for a general electronic blood pressure monitor such as a power supply for operating the blood pressure monitor and a motor for applying pressure to the cuff are omitted in order to clarify the essence of the invention. Therefore, it is apparent to those skilled in the art that elements other than the above-described components such as a power source, a motor, a signal processor, a signal detector, and the like can be added.

In addition, it is to be understood that the present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the scope of the present invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

100 ............................................ Blood pressure monitor
110 ............................................ Cuff part
120 ............................................ First sensor
121 ............................................ Second sensor
130 .......................................... The data conversion unit
140 ............................................ Blood pressure value determination unit
150 ............................................ Display

Claims (10)

A cuff portion for applying pressure;
A first sensor and a second sensor which are spaced apart from each other in the cuff portion to detect a change in pressure of each of the blood vessels; And
And a blood pressure value determination unit for determining a systolic blood pressure and a diastolic blood pressure based on a signal pattern of a pressure sensed by the first sensor and the second sensor,
The blood pressure value determining unit may determine,
A systolic blood pressure is determined as a systolic blood pressure at a time when a signal sensed by the first sensor and a signal sensed by the second sensor show a difference at a predetermined time interval, Wherein the pressure applied to the cuff portion is determined as a diastolic blood pressure at a time when a signal is not sensed by the first sensor and the second sensor and a difference between predetermined time intervals disappears. delete delete The method according to claim 1,
The cuff portion
And gradually decreases the pressure to a predetermined minimum pressure after the predetermined maximum pressure is applied. The method according to claim 1,
And a data converter for converting a pressure signal sensed by the first sensor and the second sensor into a digital signal. The method according to claim 1,
And a display unit for displaying to the user the systolic blood pressure and the diastolic blood pressure determined by the blood pressure value determination unit. Applying a predetermined maximum pressure to the user's body through the cuff portion;
Sensing a pressure change at a first point and a second point of the blood vessel in the user's body while gradually reducing the pressure of the cuff portion; And
And determining a systolic blood pressure and a diastolic blood pressure based on a signal pattern of the sensed pressure at the first point and the second point,
Wherein the first point and the second point are spaced apart from the user's body contacting the cuff portion,
Wherein the determining comprises:
Determining a systolic blood pressure by determining a pressure of the cuff part at a time when a signal sensed at the first point and a signal sensed at the second point show a difference at regular time intervals, And determining a diastolic blood pressure by judging a pressure of the cuff part at a time point when the signal is not sensed at the first point and the second point and the difference of the predetermined time interval disappears. delete delete 8. The method of claim 7,
And displaying the determined systolic blood pressure and diastolic blood pressure to the user.

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