KR20200043900A - Blood Pressure Meter And Method For Measuring Blood Pressure Using The Same - Google Patents

Abstract

The present invention provides a blood pressure meter and a blood pressure measurement method using the same. The blood pressure meter comprises: a parameter (PM) change amount calculation unit to calculate a change amount of a pulse wave parameter created by an elevation difference between arbitrary two points at which a pulse wave is measured; and a blood pressure calculation unit to calculate a blood pressure from a blood pressure change amount created by the elevation difference between the two points at which the pulse wave is measured, the change amount of the pulse wave parameter, and the pulse wave parameter. The present invention provides a blood pressure meter to measure a blood pressure by using a blood pressure difference created by an elevation difference (height difference) of measurement positions and a change amount of a pulse wave parameter caused by a measurement position change and, more specifically, a blood pressure meter capable of reflecting a rapid change of a blood vessel condition having a great effect on blood pressure measurement with a blood flow rate in a blood pressure meter in blood pressure calculation. Therefore, whenever a blood pressure is measured, the blood pressure at measurement positions can be accurately measured from a change amount of a pulse wave parameter, and the accuracy of the blood pressure, namely the reliability of the blood pressure meter can be greatly improved.

Description

Blood pressure meter and method for measuring blood pressure using the same

The present invention relates to a blood pressure monitor and a blood pressure measuring method, and more specifically, a blood pressure monitor for calculating blood pressure using a blood pressure difference (a change in blood pressure) and a change in pulse wave parameters according to an altitude difference (height difference) of a pulse wave measurement location and blood pressure using the same It relates to a measuring method.

In general, measuring the pressure that blood has on the walls of blood vessels is called blood pressure, and the heart repeats contraction and relaxation about 60 to 80 times per minute. When the heart contracts and pushes out blood, the pressure on the blood vessels is called 'constriction blood pressure' and is called 'highest blood pressure' because it is the highest. In addition, when the blood is received while the heart is relaxed, the blood vessel pressure is called 'relaxed blood pressure' and is called 'lowest blood pressure' because it is the lowest.

Normally, the blood pressure of normal people is 120 mmHg of systolic blood pressure and 80 mmHg of diastolic pressure. More than 1 out of 4 adults in Korea are hypertensive, and since the age of 40, this rate has been increasing rapidly, and there are also patients classified as hypotension.

The high blood pressure is a problem, because it can cause other complications that can threaten life, such as eye disease, kidney disease, arterial disease, brain disease, heart disease, if left without proper management of high blood pressure, complications Patients with or at risk of complications should continuously measure and manage blood pressure.

As the interest in health and diseases related to adult diseases such as hypertension described above increases, various types of blood pressure measuring devices have been developed. Blood pressure measurement methods include a stethoscope (Korotkoff sounds) method, an oscillometric method, and a tonometric method.

The auscultation method is a typical pressure measurement method. In the process of depressurizing after blocking the flow of blood by applying sufficient pressure to a part of the body where arterial blood passes, the pressure at the moment of the first pulse sound is measured as systolic pressure. It is a method to measure the pressure at the moment when the pulse sound disappears by diastolic pressure.

In addition, the oscillometric method and the tonometric method are applied to a digitized blood pressure measuring device. The oscillometric method, like the auscultation method, sufficiently pressurizes the body part passing through the arterial blood so that the blood flow of the artery is blocked, and then depressurizes the body part at a constant rate, or the pulse wave generated during the process to pressurize the body part at a constant rate. Detect and measure systolic and diastolic blood pressure.

Here, the pressure at a certain level may be measured as systolic blood pressure or diastolic blood pressure compared to the moment when the amplitude of the pulse wave is the maximum, and the pressure when the rate of change of the pulse wave amplitude is rapidly changed is measured as systolic blood pressure or diastolic blood pressure. You may.

Then, in the process of depressurizing at a constant speed after pressurization, systolic blood pressure is measured ahead of the moment when the amplitude of the pulse wave is maximum, and diastolic blood pressure is measured later than the moment when the amplitude of the pulse wave is maximum. Conversely, in the process of increasing the pressure at a constant speed, systolic blood pressure is measured later than the moment when the amplitude of the pulse wave is maximum, and diastolic blood pressure is measured before the moment when the amplitude of the pulse wave is maximum.

The tonometric method is a method capable of continuously measuring blood pressure by applying a certain pressure of a size that does not completely block the blood flow of the artery to the body part, and using the size and shape of the pulse wave generated at this time.

As described above, a device for measuring blood pressure in various ways, that is, a sphygmomanometer, is the most basic medical device for measuring blood pressure, which is the basis of a health index, and is not only provided in general hospitals, but also in homes and sports centers. It is widely used to measure blood pressure.

Most of the blood pressure monitors currently being used are designed to measure at the upper arm similar to the height of the heart, but products for measuring blood pressure in a body part such as a wrist or finger are being developed for convenience in carrying and measuring. The wrist sphygmomanometer or finger sphygmomanometer described above has a small size compared to the upper arm sphygmomanometer and is convenient to carry and easy to measure at any time.

On the other hand, in the case of a conventional blood pressure monitor that measures blood pressure using pulse waves, for example, a blood pressure monitor that calculates blood pressure based on optical arterial wave (PPG) or other pulse wave propagation speed (PTT), instability may be caused by vascular conditions. And the accuracy of blood pressure measurement may be degraded.

Accordingly, the present inventor has developed a blood pressure monitor and a blood pressure acquisition method capable of reflecting, for example, a rapid change in a blood vessel state having a large effect on blood pressure along with blood flow, for example, a change in blood vessel cross-section.

Republic of Korea Patent Publication No. 10-2010-0118331, published on November 5, 2010 Republic of Korea Registered Patent No. 10-1844897, registered on March 28, 2018

The present invention; An object of the present invention is to provide a sphygmomanometer for calculating blood pressure using a difference in blood pressure (a change in blood pressure) and a change in pulse wave parameters according to an altitude difference (height difference) of a pulse wave measurement position and a blood pressure measurement method using the same.

An aspect of the present invention includes: a parameter change amount calculation unit for calculating a change amount of a pulse wave parameter (Parameter: PM) caused by an altitude difference between two arbitrary points where pulse wave measurement is performed; And it provides a blood pressure monitor including a blood pressure change unit for calculating the blood pressure from the change in blood pressure caused by the altitude difference between the two points where the measurement of the pulse wave is made, and the change in the pulse wave parameter and the pulse wave parameter.

The blood pressure calculating unit may calculate a blood pressure change rate from the blood pressure change amount according to the change amount of the parameter of the pulse wave, and calculate the blood pressure using the blood pressure change rate and the pulse wave parameter.

The pulse wave parameter (PM) is not limited to any one of an optical arterial wave (PPG), arterial pressure, arterial electrical resistance pulse wave, pulse transit time (PTT), and blood flow velocity.

The blood pressure monitor may further include a pulse transit time (PTT) detection unit for detecting the pulse transmission time.

The PTT detection unit may include an electrocardiogram measurement unit for measuring an electrocardiogram (ECG) and a pulse wave measurement unit for measuring the pulse wave. The electrocardiogram measurement unit and the pulse wave measurement unit may be provided in a cuff that can be worn on a predetermined part of the body.

The sphygmomanometer may further include a blood flow velocity measurement unit for detecting the blood flow velocity, which is a kind of the pulse wave parameter.

When the pulse wave parameter is an optical arterial wave or arterial pressure, the blood pressure monitor may further include an optical arterial wave measurement unit for detecting the optical arterial wave or an arterial pressure measurement unit for detecting the arterial pressure.

In addition, when the pulse wave parameter is an arterial electrical resistance pulse wave, the blood pressure monitor may further include an arterial electrical resistance pulse wave measurement unit for detecting the arterial electrical resistance pulse wave.

The rate of blood pressure change may be calculated by the following [Equation 1].

[Equation 1]

Blood pressure change rate

(△ P is the amount of blood pressure change caused by altitude difference between any two points where pulse wave is measured (blood pressure difference caused by altitude difference), △ PM is the amount of change in pulse wave parameter between any two points)

The amount of change in the pulse wave parameter may be a difference in pulse wave transmission time measured at the arbitrary two points.

The sphygmomanometer may further include a blood pressure difference calculator for calculating the amount of change in blood pressure, which is a blood pressure difference caused by an altitude difference between two arbitrary points, using Equation 2 below.

[Equation 2]

△ P = g × ρ × △ H

(g is the acceleration of gravity, ρ is the density of blood, △ H is the altitude difference between any two points where the pulse wave is measured)

Preferably, the gravity acceleration is changed to a gravity acceleration for each region and input to the blood pressure difference calculator. In addition, the density of the blood is preferably changed for each race and input to the blood pressure difference calculating unit. That is, it is preferable that the density of blood is set for each race and the density of blood corresponding to the user's race is applied for calculating the blood pressure difference.

Another aspect of the present invention: calculates the amount of change in the pulse wave parameter (PM) caused by the altitude difference between any two points where pulse wave measurement is made, and is generated by the altitude difference between the two points where pulse wave measurement is made. Provided is a blood pressure measurement method for calculating blood pressure from a change in blood pressure that is a blood pressure difference, a change in the pulse wave parameters, and a pulse wave parameter.

The blood pressure measuring method includes: (a) calculating a change amount of the pulse wave parameter; And it may include the step (b) of calculating the blood pressure from the change in blood pressure and the change in the pulse wave parameters and pulse wave parameters.

The blood pressure measuring method may further include the step of calculating the change in blood pressure from the altitude difference between the arbitrary two points before, after, or simultaneously with step (a) of calculating the change in the pulse wave parameter.

The step (b) includes calculating a blood pressure change rate from the blood pressure change amount according to the change amount of the pulse wave parameter and calculating the blood pressure using the blood pressure change rate and the pulse wave parameter; The rate of blood pressure change may be calculated by the following [Equation 1].

[Equation 1]

Blood pressure change rate

(△ P is the amount of blood pressure change caused by altitude difference between any two points where pulse wave is measured (blood pressure difference caused by altitude difference), △ PM is the amount of change in pulse wave parameter between any two points)

In the step (b), the blood pressure may be calculated using the following [Equation 3] from the blood pressure change rate and the pulse wave parameter.

[Equation 3]

Blood pressure (P ₁ ) = (PM ₁ value) X (blood pressure change rate)

(P ₁ is the blood pressure for the higher position (H ₁ ) among 2 arbitrary points, PM _{1 is the} value of pulse wave parameter measured at H ₁ height)

The present invention is a sphygmomanometer that measures blood pressure using a difference in blood pressure caused by an altitude difference (height difference) of a measurement position and a change in pulse wave parameters according to a change in measurement position, and more specifically, blood vessels having a large influence on blood pressure measurement along with blood flow in the sphygmomanometer Since it is a blood pressure monitor capable of reflecting a rapid change of state in blood pressure calculation, blood pressure at a measurement position can be more accurately measured from a change in pulse wave parameter every time blood pressure is measured, and accuracy of blood pressure, that is, reliability of a blood pressure monitor can be greatly improved.

Features and advantages of the present invention may be better understood with reference to the drawings described below along with a detailed description of embodiments of the present invention described below, among the drawings:
1 is a block diagram showing the configuration of a blood pressure monitor according to an embodiment of the present invention;
Figure 2 is a schematic view showing a blood pressure monitor according to an embodiment of the present invention;
3 is a view showing an example of a blood pressure measurement method according to an embodiment of the present invention;
4 is a graph illustrating the calculation of pulse transit time (PTT) as an example of pulse wave parameters from an electrocardiogram and pulse wave measured by an embodiment of the present invention;
Figure 5 is a flow chart schematically showing a blood pressure measurement method according to an embodiment of the present invention; And
6 is a developed view showing a blood pressure monitor according to another embodiment of the present invention;
7 is a view showing a state in which the blood pressure monitor shown in FIG. 6 is worn on the body (upper arm);
8 is a diagram illustrating another method of measuring pulse wave propagation time; And
9 is a diagram illustrating a method of measuring blood velocity, which is another example of pulse wave parameters.

Hereinafter, preferred embodiments of the present invention, in which the object of the present invention can be specifically realized, will be described with reference to the accompanying drawings. In describing the embodiments, the same name and the same code are used for the same configuration, and additional descriptions thereof are omitted below.

Terms used in the present specification are used to describe embodiments of the present invention, and are not intended to limit the present invention. For example, terms including an ordinal number such as “first” and “second” may be used to distinguish each other when describing components having the same name, but do not define or limit the number of components.

And when a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to the other component, but there is another component in the middle It should be understood that the relationship also includes an indirectly connected relationship.

In the present specification, terms such as “include” or “have” mean that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and one or more other features However, it should be understood that the presence of numbers, steps, actions, components, parts or combinations thereof, ie, the possibility of addition is not excluded.

The blood pressure monitor according to an embodiment of the present invention is a device for measuring blood pressure, and may be implemented as a portable blood pressure monitor, more specifically, a wearable measuring device of blood pressure. For example, an embodiment of the present invention may be provided as a portable sphygmomanometer worn on the human body to measure the pulse wave of the measurement target region (target region) and obtain a blood pressure value from the pulse wave parameter.

Hereinafter, embodiments of the blood pressure monitor according to the present invention will be described with reference to the accompanying drawings.

1 to 4, an embodiment of a blood pressure monitor according to the present invention uses a parameter change amount calculating unit 10 for calculating a change amount of a pulse wave parameter (PM), and blood pressure using data such as pulse wave parameters It includes a blood pressure calculation unit 20 for calculating.

The sphygmomanometer according to one embodiment of the present invention may be provided as a wearable sphygmomanometer, that is, a portable type, such as a wrist sphygmomanometer or a finger sphygmomanometer that can be worn on a predetermined part of the human body, for example, a wrist or a finger. In addition, the present invention may be applied to a smart phone, for example, a blood pressure monitor that measures blood pressure by contacting a finger with a light measuring sensor of the smart phone.

The parameter change amount calculating unit 10 is configured to calculate a change amount of the pulse wave parameter PM generated by the altitude difference ΔH between any two points where pulse wave measurement is performed. In addition, the blood pressure calculating unit 20 calculates blood pressure from a change in blood pressure generated by an altitude difference between two points at which pulse waves are measured, a change in the pulse wave parameters, and a pulse wave parameter.

In this embodiment, the parameter change amount calculation unit 10 and the blood pressure calculation unit 20 calculates blood pressure using data input from a sensor, for example, a signal detection sensor such as an optical blood flow meter or altitude difference detection unit described later. The components are included in the blood pressure monitor control module (C).

In more detail, the blood pressure calculating unit 20 calculates a blood pressure change rate from a blood pressure change amount according to the change amount of the pulse wave parameter, and calculates the blood pressure using the blood pressure change rate and the pulse wave parameter.

To this end, the blood pressure monitor according to the present embodiment further includes a blood pressure difference calculating unit 30 for calculating a blood pressure difference caused by an altitude difference (ΔH) between the arbitrary two points, that is, a change in blood pressure due to the altitude difference. Can. The blood pressure monitor further includes a parameter measurement unit 40 for acquiring the pulse wave parameters.

Examples of the pulse wave parameter PM include optical arterial wave (PPG), arterial pressure, pulse transit time (PTT), blood flow velocity, and arterial electrical resistance pulse wave, and the pulse wave parameter is limited to the above-described example It is not.

In order to use the pulse wave propagation time as a pulse wave parameter for calculating blood pressure, the blood pressure monitor is provided with a pulse transit time (PTT) detector 41 for detecting the pulse wave propagation time as an example of the parameter measurement part 40. You can.

The PTT detection unit 41 may include an electrocardiogram measurement unit (electrocardiogram) 41a for measuring an electrocardiogram (ECG) and a pulse wave measurement unit 41b for measuring a pulse wave. The electrocardiogram measurement unit 41a and the pulse wave measurement unit 41b are provided with a cuff 110 that can be worn on a predetermined part of the body, for example, a wrist or an arm (upper arm), as shown in FIG. 2. Can be. Both ends of the cuff 110 may be detached by Velcro 120 or other detachable means.

In addition, electrodes 41a for ECG measurement may be provided on the inner and outer surfaces of the cuff 110, and although not shown, calculate blood pressure from pulse wave parameters, control the blood pressure monitor, and output the calculated blood pressure. The control module C is embedded in the display device, and the display device may be mounted on the cuff 110 so that the user can visually check blood pressure. As another example of the parameter measurement unit 40, a blood flow rate measurement unit for detecting the blood flow rate described above may be applied.

Of course, when the pulse wave parameter used for blood pressure measurement is optical arterial wave or arterial pressure, the blood pressure monitor may be provided with an optical arterial wave measuring unit for detecting optical arterial waves or an arterial pressure measuring unit for detecting the arterial pressure. In other words, the arterial pressure measuring unit may be applied to the parameter measuring unit 40 described above, and the arterial pressure measuring unit detects arterial pressure, for example, arterial pressure at any two points having different altitudes, and the pulse wave as described above. As a parameter, the parameter change amount calculating unit 10 can calculate the amount of change in arterial pressure between the two points described above as the change amount of the pulse wave parameter. Therefore, it can be seen that the arterial wave becomes a pulse wave parameter, and in this case, the amount of change in arterial pressure between any two points becomes the amount of change in the above-described pulse wave parameter. In addition, the blood pressure calculating unit 20 may calculate blood pressure from a change in blood pressure caused by an altitude difference between two points at which arterial pressure is measured, a change in the pulse wave parameter (a change in arterial pressure), and a pulse wave parameter (arterial pressure). When the above-described pulse wave parameter measurement is a measurement of arterial pressure, a point at which pulse wave measurement is performed means a point at which arterial pressure measurement is performed. In addition, when the pulse wave parameter is an arterial electrical resistance pulse wave, the blood pressure monitor is provided with an arterial electrical resistance pulse wave measurement unit. For example, the above-described arterial electrical resistance pulse wave may be measured based on a body fat measurement technique using electrical resistance, more specifically, a body fat measurement device. When measuring body fat, the body fat is measured based on the electrical resistance of the skin. By using this principle, the pulse wave of the artery, that is, the pulse wave of the artery, can be measured by the electrical resistance of the artery.

An example of the pulse wave measuring unit 41b is a photoplethysmography, but is not limited thereto, and a sensor capable of measuring pulse wave, for example, a pressure sensor is also possible. Although not shown, a general photo blood flow meter includes a light emitting part and a light receiving part.

The altitude difference detection of the pulse wave measurement position may be performed by the altitude difference detection unit 50, and the altitude difference detection unit 50 includes at least one of an acceleration sensor, an altitude sensor, a pressure sensor, a differential amplifier, and a gyro sensor. can do. The altitude difference detecting unit 50 may be any device that can measure a height difference (altitude difference) between arbitrary positions where pulse waves are measured, and the altitude difference measured by the altitude difference detecting unit 50 is described above. It is input to a blood pressure difference calculator 30.

Of course, the altitude difference (ΔH) of the difference between the two points may be measured by hand using a ruler, such as a measuring tape, for example, and when the manually measured altitude difference is input to the blood pressure monitor, , A blood pressure difference (a change in blood pressure) generated by the altitude difference from the input altitude difference ΔH may be calculated by the blood pressure difference calculator 30.

The altitude difference detection unit 50 is a configuration for detecting altitude change, and detects altitude of a target region, that is, a body region where blood pressure measurement is performed, and detects an altitude difference (height difference) between any two points where blood pressure measurement is performed.

For example, as shown in FIG. 3, when a person (user) wearing the blood pressure monitor 100 measures pulse waves at the first height H1 and the second height H2, the altitude difference detecting unit 50 is described above. It detects the height difference between two positions.

And the blood pressure change rate can be obtained from the blood pressure difference (a change in blood pressure) and the pulse wave parameter change caused by the above-described altitude difference.

The rate of blood pressure change may be calculated by the following [Equation 1].

(△ P is the amount of blood pressure change caused by altitude difference between any two points where pulse wave is measured (blood pressure difference caused by altitude difference), △ PM is the amount of change in pulse wave parameter between any two points)

Therefore, when the arterial pressure is a pulse wave parameter, the blood pressure difference in [Equation 1] (a change in blood pressure, ΔP) becomes a blood pressure difference caused by an altitude difference between two points where arterial pressure is measured, and ΔPM is arbitrary The amount of change in arterial pressure between any two points where arterial pressure is measured is the amount of change in the pulse wave parameter between the two points, which can be equally applied to other equations below.

In addition, the blood pressure difference calculating unit 30 may calculate the blood pressure difference ΔP, that is, a change in blood pressure using Equation 2 below, but is not limited thereto.

(g is the acceleration of gravity, ρ is the density of blood, △ H is the altitude difference between any two points where the pulse wave is measured)

As described above, when the arterial pressure is a pulse wave parameter, it can be seen that ΔH is an altitude difference between any two points at which the arterial pressure is measured.

Since there is a difference in the gravitational acceleration for each region, it is preferable that the gravitational acceleration is changed to the gravitational acceleration for each region and input to the blood pressure difference calculator 30. The gravity acceleration can be automatically set (changed) according to the user's current position. In addition, the density ρ of the blood may be a measured value or a predetermined average value. For more accurate blood pressure calculation, it is preferable that the density of the blood is changed for each race and input to the blood pressure difference calculation unit 30. More specifically, the density of the blood is set for each race, and the density of blood corresponding to the user's race is input to the blood pressure difference calculating unit 30 to be applied to blood pressure measurement.

The amount of change in the pulse wave parameter may be a difference between the pulse wave transmission time (PTT) measured at the arbitrary two points.

In addition, the blood pressure calculator 20 may calculate blood pressure using the following Equation 3 from the blood pressure change rate and pulse wave parameters. That is, the blood pressure can be expressed as a product of the blood pressure change rate and the pulse wave parameter.

(P ₁ is the blood pressure for the higher position (H ₁ ) among 2 arbitrary points, PM _{1 is the} value of pulse wave parameter measured at H ₁ height)

If the arterial pressure pulse wave parameters are as described above, PM ₁ value is the value of the arterial pressure measured at the value, die height H ₁ of the pulse wave parameters to be measured at a height H _1.

The above-described blood pressure value P ₁ is a blood pressure value at a high position H ₁ among any two points where pulse wave parameters are measured.

More specifically, the blood pressure P in the blood vessel may be expressed as [Equation 4] below.

(P is blood pressure at any vascular position, V is blood flow velocity, R is flow resistance)

Therefore, as shown in the example shown in FIG. 3, blood pressure measured at any two points, i.e., different heights (H ₁ , H ₂ ), is related to the following [Equation 5].

(P ₁ and P ₂ are each a height H ₁ and the pressure of H _2, V ₁ and V ₂ are each a height H ₁ and the pulse wave passes the blood flow rate of H _2, T ₁ and T ₂ is the height H ₁ and H ₂ respectively, time)

And, Figure 4, the pulse wave propagation time is the difference in the H ₁ height T ₁ is obtained and, T ₂ that is obtained from the H ₂ height, one example a pulse wave transit time (PTT) of the pulse wave parameter change amount (△ T , PTT change) can be calculated as follows.

Accordingly, when the difference (ΔT) of the pulse wave transmission time (PTT) described above is applied to the change in the pulse wave parameter, the rate of change in blood pressure in Equation 1 may be expressed as follows.

Then, when the pulse wave propagation time is applied to the pulse wave parameter, and when the PTT change, that is, the difference in pulse wave propagation time, is applied as the change amount of the pulse wave parameter, the maximum blood pressure (P ₁ max) at the height of H ₁ is as shown in [Equation 6]. Can be obtained.

And when the H ₁ height is not the heart height, the blood pressure value obtained at the H ₁ height is corrected to the blood pressure of the heart height using a known blood pressure correction method, and then displayed through the blood pressure output unit 70, for example, a digital screen. Can be. Since blood pressure correction to heart height is a known technique, an additional description thereof is omitted.

For reference, the setting of the reference value in the blood pressure monitor may be performed through initial setting using blood pressure measured in a separate blood pressure monitor, and the blood pressure monitor setting may be implemented by the blood pressure monitor setting unit 60.

Referring to FIG. 5, a blood pressure measurement method, that is, a blood pressure calculation method according to an embodiment of the present invention, calculates a change amount of a pulse wave parameter (PM) caused by an altitude difference between two arbitrary points where pulse wave measurement is performed, The blood pressure difference, which is a difference in blood pressure caused by the altitude difference between two points at which the pulse wave is measured, is calculated through the process of calculating blood pressure from the change in the pulse wave parameter and the pulse wave parameter.

More specifically, the blood pressure measuring method comprises: (a) (S110) for calculating a change amount of the pulse wave parameter and (b) calculating a blood pressure from the change in the blood pressure change amount and the pulse wave parameter and the pulse wave parameter ( S120). For example, when the above-described arterial pressure becomes the pulse wave parameter, the change amount of the pulse wave parameter in step (a) becomes the arterial pressure change amount. In conclusion, in step (a) (S110), the arterial pressure may be used as the pulse wave parameter, and the amount of change in the arterial pressure may be calculated as the change in the pulse wave parameter. In addition, in step (b), the blood pressure may be calculated from the above-described changes in blood pressure and the amount of change in the pulse wave parameter (the amount of change in arterial pressure) and the pulse wave parameter (the pressure in artery).

In the blood pressure measurement method, the altitude difference between any two points (△) before, after, or simultaneously with the step (a) of calculating the change amount of the pulse wave parameter, for example, the difference in the pulse wave delivery time or the above-described change in arterial pressure (difference in arterial pressure) The method may further include calculating the amount of blood pressure change (blood pressure difference; ΔP) from H).

The step (b) (S120) includes calculating a blood pressure change rate from the blood pressure change amount according to the change amount of the pulse wave parameter (S121) and calculating the blood pressure using the blood pressure change rate and pulse wave parameter (S122). , The blood pressure change rate can be calculated in the manner described in the above-described embodiment.

In addition, the blood pressure calculation may be performed through [Equation 3] more specifically, [Equation 3] described above using the blood pressure change rate and the pulse wave parameter.

Before calculating the pulse wave parameter variation and the blood pressure difference described above, pulse wave parameter measurement (S10), for example, electrocardiogram and pulse wave measurement, is performed. Then, when the blood pressure is calculated through the above-described process, the user's blood pressure is output through the screen of the blood pressure monitor (S130), and the user can check his or her blood pressure through this.

6 and 7, another embodiment of a blood pressure monitor according to the present invention is a cuff blood pressure monitor 100A worn on a forearm (arm), an example of a pulse wave measurement unit provided at a different height from the electrocardiogram measurement unit 41a. For example, including a plurality of photo blood flow measuring devices (41b), the electrocardiogram measurement unit (41a) and pulse wave measurement unit (41b) is provided with a cuff (110A) forearm, one electrode of the electrodes of the electrocardiogram measurement unit It is mounted on the cuff 110A and the other electrode is connected by a wire to be attached to other parts of the body.

According to the example shown in FIGS. 6 and 7, PTT change can be obtained as in the embodiments shown in FIGS. 1 to 4 and applied as a pulse wave parameter change amount. The height difference of the photo blood flow meter 41b becomes the altitude difference (ΔH) of the pulse wave measurement position. Therefore, the user's blood pressure can be calculated in the manner described above.

FIG. 8 illustrates a method for measuring blood flow velocity, and pulse waves are detected as shown in FIG. 8 (b) at two points on the blood vessel A with a distance (s; blood vessel length between two points) between the pulse wave measurement points. When, the difference (t) of the pulse wave transmission time occurs, from which the blood flow velocity (V = s / t) can be obtained. The pulse wave may be detected by a plurality of pulse wave measuring units 42a and 42b spaced apart from each other, for example, a photo blood flow meter or a pressure sensor. For reference, FIG. 9 illustrates another method of measuring the blood rate, and for example, a sensor 43 based on ultrasonic waves or electromagnetic waves (radar) may be applied.

As described above, the embodiments according to the present invention have been looked at, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope of the embodiments described above are those with ordinary knowledge in the art. It is self-evident.

Therefore, the above-described embodiments are to be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description and may be changed within the scope of the appended claims and their equivalents.

10: parameter change amount calculation unit 20: blood pressure calculation unit
30: blood pressure difference calculation unit 40: parameter measurement unit
41: PTT detection unit 41a: ECG measurement unit
41b: pulse wave measurement unit 50: altitude difference detection unit
60: Sphygmomanometer setting unit 100, 100A: Sphygmomanometer
110, 110A: Cuff 120: Velcro

Claims (11)

Arterial pressure measurement unit for detecting arterial pressure;
A parameter change amount calculating unit for calculating the amount of change in arterial pressure between any two points at which the arterial pressure is measured as the change in pulse wave parameter (PM) using the arterial pressure as a pulse wave parameter; And
A blood pressure monitor comprising a blood pressure calculating unit that calculates blood pressure from a change in blood pressure caused by an altitude difference between two points at which the arterial pressure is measured, a change in the pulse wave parameter, and arterial pressure as the pulse wave parameter. According to claim 1,
The blood pressure calculator calculates the blood pressure change rate from the blood pressure change amount according to the change amount of the pulse wave parameter, and calculates the blood pressure using the blood pressure change rate and the pulse wave parameter. According to claim 2,
The blood pressure change rate is a blood pressure monitor, characterized in that calculated by the following [Equation 1].
[Equation 1]
Blood pressure change rate = △ P / △ PM
(△ P is the amount of blood pressure change caused by altitude difference between any two points where arterial pressure is measured (blood pressure difference caused by altitude difference), △ PM is the amount of change in pulse wave parameters between any two points (the amount of arterial pressure change) According to claim 3,
A blood pressure monitor characterized in that it further comprises a blood pressure difference calculating unit for calculating the amount of change in blood pressure that becomes a blood pressure difference caused by an altitude difference between the arbitrary two points using Equation 2 below.
[Equation 2]
△ P = g × ρ × △ H
(g is the acceleration of gravity, ρ is the density of blood, ΔH is the altitude difference between any two points where the arterial pressure is measured) According to claim 4,
The gravity acceleration is changed to the gravity acceleration of each region, the blood pressure monitor characterized in that input to the blood pressure difference calculation unit. According to claim 4,
A blood pressure monitor characterized in that the density of the blood is changed for each race and input to the blood pressure difference calculating unit. Arterial pressure is detected at any two points with different altitudes, the arterial pressure is used as a pulse wave parameter, and the amount of change in arterial pressure between any two points at which the arterial pressure is measured is calculated as a change in pulse wave parameter (PM), and the arterial pressure is calculated. A blood pressure measurement method for calculating blood pressure from a change in blood pressure that is a difference in blood pressure caused by an altitude difference between two points at which measurement is performed, a change in the pulse wave parameter, and arterial pressure that is the pulse wave parameter. The method of claim 7,
(A) calculating the change in arterial pressure as a change in the pulse wave parameter by using the arterial pressure as a pulse wave parameter; And
And (b) calculating blood pressure from the change in the blood pressure and the change in the pulse wave parameter and the pulse wave parameter. The method of claim 8,
And (a) calculating a change in blood pressure from an altitude difference between any two points before, after, or simultaneously with the step of calculating a change in the pulse wave parameter. The method of claim 8 or 9,
The step (b) includes calculating a blood pressure change rate from the blood pressure change amount according to the change amount of the pulse wave parameter and calculating the blood pressure using the blood pressure change rate and the pulse wave parameter;
The blood pressure change rate, blood pressure measurement method, characterized in that calculated by the following [Equation 1].
[Equation 1]
Blood pressure change rate = △ P / △ PM
(△ P is the amount of change in blood pressure caused by altitude difference between any two points where arterial pressure is measured (blood pressure difference caused by altitude difference), △ PM is the amount of change in pulse wave parameter between any two points where arterial pressure is measured Change in arterial pressure between any two points) The method of claim 10,
In the step (b), the blood pressure measurement method is characterized in that the blood pressure is calculated using the following [Equation 3] from the blood pressure change rate and pulse wave parameter.
[Equation 3]
Blood pressure (P ₁ ) = (PM ₁ value) X (blood pressure change rate)
(P ₁ is the blood pressure for the high position (H ₁ ) among any 2 points, PM ₁ is the arterial pressure value, which is the value of the pulse wave parameter measured at the height of H ₁ )

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