KR20080074624A - Blood pressure measuring device and method - Google Patents

Abstract

The present invention relates to a blood pressure measuring apparatus and method for improving the convenience of the subject by enabling the blood pressure of the subject to be measured without limiting the posture or movement of the subject during blood pressure measurement. To this end, the blood pressure measuring device according to the present invention includes a sensor unit for measuring the electrocardiogram and pulse wave of the subject; A body information input unit configured to receive body characteristic information of the subject; Obtaining pulse wave propagation time and pulse wave analysis information based on at least one or more of the measured electrocardiogram or pulse wave, and applying to the regression equation based on the obtained pulse wave propagation time and pulse wave analysis information and the input physical characteristics information of the subject By including a control unit for calculating the blood pressure value, so that the blood pressure of the subject can be measured without limiting the posture or movement of the subject.

Description

Blood pressure measuring device and its method {APPARATUS FOR MEASURING BLOOD PRESSURE AND METHOD THEREOF}

1 is a block diagram showing a blood pressure measuring device for measuring the blood pressure of the subject without limiting the posture or movement of the subject according to an embodiment of the present invention.

Figure 2 is a block diagram showing a blood pressure measuring device for measuring the electrocardiogram and pulse wave of the subject without limiting the posture or movement of the subject according to an embodiment of the present invention.

3 is a flowchart illustrating a blood pressure measuring method for measuring blood pressure of the subject without limiting posture or movement of the subject according to an exemplary embodiment of the present invention.

4 is a waveform diagram for obtaining a pulse wave propagation time according to an embodiment of the present invention.

5 is a waveform diagram for obtaining pulse wave analysis information according to an embodiment of the present invention.

*** Explanation of symbols for main parts of drawing ***

10: sensor unit 11A, 11B: electrocardiogram measuring electrode

12: pressure sensor 13: body

14: band 20: body information input unit

30: control unit 40: output unit

50: storage

The present invention relates to a blood pressure measuring apparatus and a method thereof, and more particularly to a blood pressure measuring apparatus and method for measuring the blood pressure of the subject without limiting the posture or movement of the subject during blood pressure measurement.

As the interest in health increases, medical service visits the hospital only when sick and breaks the passive form of receiving prescriptions from doctors.The subject purchases a separate medical device that he / she needs and uses the purchased medical device. Thus, the blood pressure, heart rate, electrocardiogram, pulse rate, respiratory rate, body fat, etc. of the subject can be examined at the place where the subject is desired. The medical signal is transmitted to a medical center through a wired or wireless communication medium such as a mobile phone, a personal digital assistant (PDA), a personal computer (PC), and the like, and receives a consultation and prescription from a specialist based on the transmitted biosignal. On the basis of the prescription, the form of the medical service is being changed to the concept of an active form in which the subject measures according to a situation and prevents a greater illness in advance.

Accordingly, according to the change of the medical service form, the subject can measure his or her own health state by using various products such as a pulse watch in the form of a wrist watch, an oxygen saturation meter, a portable ECG, and the like.

Blood pressure refers to the pressure applied to the blood vessel wall when blood flows through the blood vessel.

In addition, the blood pressure is an important physiological index including a lot of information about cardiac output, blood vessel elasticity, physiological change of the subject.

Blood pressure measurement can be divided into invasive and non-invasive methods.

The invasive method is to insert a catheter into a blood vessel to continuously and accurately measure blood pressure. However, such invasive methods can lead to problems with the risk of infection and side effects.

The non-invasive method is mainly a method for measuring blood pressure by detecting the sound or vibration of the pulse while pressing and depressurizing using a cuff, the non-invasive method is limited to continuously measuring the blood pressure. Among other non-invasive methods, a representative method for measuring blood pressure without using a cuff is pulse transit time (PTT) from electrocardiogram (ECG) and photo plethysmogram (PPG). To obtain the blood pressure using the pulse wave delivery time.

For continuous measurement and observation of blood pressure, a method of calculating blood pressure using the pulse wave propagation time which is non-invasive and without cuff is suitable. However, in the case of calculating blood pressure using the conventional pulse wave propagation time, it is difficult to obtain a generalized regression equation that can be applied to all subjects. Therefore, it is necessary to calibrate for each individual subject. This may cause a problem that needs to be corrected.

In addition, in order to use the conventional pulse wave transmission time, by attaching electrodes to both hands of the subject and measuring electrocardiogram and pulse wave through the electrodes, a problem of limiting the posture or movement of the subject may occur.

An object of the present invention proposed to measure blood pressure using a non-invasive method without limiting the posture or movement of the subject, and to measure the electrocardiogram and pulse wave without limiting the activity of the subject, the measured electrocardiogram or pulse wave Obtain pulse wave propagation time and pulse wave analysis information using at least one of the above, and calculate the pulse wave propagation time and pulse wave analysis information based on the obtained pulse wave propagation time and pulse wave analysis information and information about the physical and physical characteristics of the subject input by the subject. The present invention provides a blood pressure measuring apparatus and method capable of measuring blood pressure using a non-invasive method without limiting the posture or movement of the subject by measuring blood pressure by applying the blood pressure value.

Another object of the present invention is to provide the convenience of the subject at the time of blood pressure measurement by measuring the electrocardiogram and pulse wave without limiting the activity of the subject.

Still another object of the present invention is to obtain pulse wave propagation time and pulse wave analysis information using at least one or more of the measured electrocardiogram or pulse wave, and obtain the pulse wave propagation time and pulse wave analysis information and the subject measured by the subject. By calculating the blood pressure value by applying to the regression equation based on the information on the physical and physical characteristics of the to provide a general purpose regression equation that can be applied to the subjects during blood pressure measurement.

Blood pressure measuring apparatus according to the present invention for achieving the above objects, the sensor unit for measuring the electrocardiogram and pulse wave of the subject; A body information input unit configured to receive body characteristic information of the subject; Obtaining pulse wave propagation time and pulse wave analysis information based on at least one or more of the measured electrocardiogram or pulse wave, and applying to the regression equation based on the obtained pulse wave propagation time and pulse wave analysis information and the input physical characteristics information of the subject And a control unit for calculating a blood pressure value.

In addition, the blood pressure measuring method according to the present invention for achieving the above object comprises the steps of measuring the electrocardiogram through the two electrodes adjacent to each other, measuring the pulse wave through at least one pressure sensor; Obtaining pulse wave propagation time and pulse wave analysis information using at least one of the measured electrocardiogram or pulse wave; Comprising the obtained pulse wave propagation time, pulse wave analysis information and the information on the physical body characteristics of the subject input by the subject to the regression formula to calculate a blood pressure value.

Hereinafter, a preferred embodiment of a blood pressure measuring apparatus and method for improving the convenience of the subject by measuring the blood pressure of the subject without limiting the posture or movement of the subject during blood pressure measurement is shown in FIG. 1. It will be described in detail with reference to Figure 5.

1 is a block diagram showing a blood pressure measuring device for measuring the blood pressure of the subject without limiting the posture or movement of the subject according to an embodiment of the present invention, as shown in the blood pressure measuring apparatus, A sensor unit 10 for measuring at least one or more of an electrocardiogram or pulse wave of the subject without limiting a posture or movement of the subject, a body information input unit 20 for receiving body characteristic information of the subject, Obtain pulse wave propagation time and pulse wave analysis information based on at least one of the measured electrocardiogram or pulse wave, and calculate blood pressure values based on the obtained pulse wave propagation time and pulse wave analysis information and the input physical characteristics information of the subject. The control unit 30 for calculating, the output unit 40 for outputting the blood pressure value calculated by the control unit 30 and the blood pressure value calculated by the control unit 30 are stored. It consists of a storage unit 50 that.

The sensor unit 10 is configured to measure at least one or more of an electrocardiogram or pulse wave of the subject without restricting the posture or movement of the subject by being attached or contacted with a body part of the subject.

In addition, the sensor unit 10 includes two electrodes adjacent to each other to measure the electrocardiogram of the subject; And at least one pressure sensor for measuring the pulse wave of the subject.

For example, as illustrated in FIG. 2, the sensor unit 10 includes electrocardiogram measuring electrodes 11A and 11B for measuring an electrocardiogram of the subject, and a pressure sensor for measuring a pulse wave of the subject. 12, the main body 13 to which the electrocardiogram measuring electrodes 11A and 11B and the pressure sensor 12 are attached, and the main body 13 may be attached to a body part of the subject to be measured. It may be composed of a band (14).

The body information input unit 20 is configured to receive at least one or more body characteristic information of a height, weight, age, sex, and arm length of the subject.

The controller 30 is configured to obtain a pulse transit time (PTT) that varies according to the pressure of the artery by using the electrocardiogram and pulse wave of the subject measured by the sensor unit 10.

In addition, the controller 30 is configured to obtain pulse wave analysis information using the pulse wave measured by the sensor unit 10.

The pulse wave analysis information includes blood vessel aging obtained through the second differential waveform analysis of the pulse wave and information obtained by analyzing the time at which the waveform is obtained.

In addition, the controller 30, at least one or more body characteristics of the obtained pulse wave transmission time and pulse wave analysis information and the height, weight, age, sex, arm length of the subject measured through the body information input unit 20 The blood pressure value is calculated based on the information.

The output unit 40 is configured to provide the blood pressure value calculated by the control unit 30 to the subject using a wired or wireless medium such as a mobile phone, a personal digital assistant, a personal computer, or an email of the subject.

The storage unit 50 is configured to store the blood pressure value calculated by the controller 30, the measured electrocardiogram and pulse wave, the obtained pulse wave transmission time and pulse wave analysis information.

In addition, the storage unit 50 stores the body characteristic information of the subject measured through the body information input unit 20.

The blood pressure measuring apparatus may be configured to measure blood pressure using a non-invasive method without limiting the posture or movement of the subject during blood pressure measurement, thereby providing convenience of the subject during blood pressure measurement.

In addition, the blood pressure measuring device obtains pulse wave propagation time and pulse wave analysis information using at least one of the measured electrocardiogram or pulse wave, and obtains the obtained pulse wave propagation time and pulse wave analysis information and the subject measured by the subject. By configuring the blood pressure value based on the information about the physical and physical characteristics of the, it is possible to provide a regression equation that can be applied to the subjects in the blood pressure measurement.

Hereinafter, a blood pressure measuring method for measuring blood pressure of the subject without limiting the posture or movement of the subject according to the present invention will be described in detail with reference to FIGS. 1 to 5.

3 is a flowchart illustrating a blood pressure measuring method for measuring blood pressure of the subject without limiting posture or movement of the subject according to an exemplary embodiment of the present invention.

First, the electrocardiogram of the subject is measured through two adjacent electrodes while maintaining free position or movement of the subject, without limiting the subject's posture or movement, and the subject through the at least one pressure sensor. Measure the pulse wave.

As an example, the electrocardiogram may be measured using the electrocardiogram measuring electrodes 11A and 11B, and the pulse wave may be measured using the pressure sensor 12 (S10).

Thereafter, the physical body characteristic information of the subject is received and stored in the storage unit 50. The physical body characteristic information of the subject includes at least one or more of height, weight, age, sex, and arm length of the subject (S20).

 Then, the pulse wave propagation time is obtained using the measured electrocardiogram and pulse wave. The pulse wave propagation time is a time difference between the time at which the peak value of the R-wave of the electrocardiogram is shown and the time at which the peak value of the pulse wave is shown as shown in FIG. PTT1 of 4), the time difference between the time at which the R-wave peak value of the measured ECG appears and the time at the point set by the subject of the pulse wave (PTT2 of FIG. 4), or the measured ECG The difference time (PPT3 in Fig. 4) between the point where the peak value of the R-wave appears and the point where the peak value of the next R-wave of the ECG appears.

The point set by the subject may be any one of a peak value of the first derivative of the pulse wave, a peak value of the second derivative of the pulse wave, and a 50% position value of the front wave (S30).

Thereafter, the measured pulse wave is analyzed to obtain pulse wave analysis information. The pulse wave analysis information, as shown in Figure 5, in the second derivative waveform of the measured pulse wave, a, corresponding to each of the first peak value, second peak value, third peak value, fourth peak value, b, c, d are obtained, and information obtained by analyzing the time to obtain the degree of vascular aging and the second derivative waveform of the pulse wave is obtained using the obtained peak values a, b, c, and d.

The pulse wave analysis information includes values obtained by combining the peak values with each other by arithmetic operation. That is, for example, values such as a + b, b + d, b / a, d / c, and (a + b) / c may be used as analysis information of the pulse wave. In addition, the pulse wave analysis information may obtain a pulse rate by analyzing a waveform obtained by first-ordering a pulse wave, and may use the pulse rate as the pulse wave analysis information.

The vascular aging degree is obtained by combining the peak values a, b, c, and d of the second derivative waveform of the pulse wave, and is expressed by Equation (1). In addition, the vascular aging degree, the higher the value indicates that the vascular aging degree is good. The degree of aging of blood vessels representing the state of blood vessels, when blood clots accumulate in the blood vessel wall, the passage of blood flow in the blood vessels is relatively reduced, thereby increasing resistance, which is a factor that may affect blood pressure.

The information obtained by analyzing the time at which the second derivative waveform of the pulse wave is obtained is related to the elasticity of blood vessels and is obtained by combining Ta, Tb, Tc, and Td shown in FIG. That is, the index indicating the blood vessel constellation is obtained through a combination preset by the user at least one or more times at which the peak value of the second derivative waveform of the pulse wave appears.

Thereafter, the obtained pulse wave propagation time, pulse wave analysis information, and body characteristic information of the subject stored in the storage unit 50 are substituted into the regression equation shown in Equation 4 to calculate a blood pressure value.

Here, C1 to C4 are constants obtained through regression analysis (S50).

Thereafter, the calculated blood pressure value is provided to the subject using the output unit 40 or stored in the storage unit 50 (S60).

As described above in detail, the apparatus for measuring blood pressure and the method according to an exemplary embodiment of the present invention measure the blood pressure by using a non-invasive method without limiting the posture or movement of the subject. There is an effect that can provide the convenience of the subject by not limiting.

In addition, the blood pressure measuring apparatus and method according to an embodiment of the present invention, using the measured electrocardiogram and pulse wave to obtain the pulse wave transmission time and pulse wave analysis information, the obtained pulse wave transmission time and pulse wave analysis information and the subject By calculating the blood pressure value based on the input information on the physical characteristics of the subject, there is an effect that can provide a generalized regression formula applicable to the subjects.

Those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential features of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (17)

Measuring an electrocardiogram through two electrodes adjacent to each other and measuring a pulse wave through at least one pressure sensor; Obtaining pulse wave propagation time and pulse wave analysis information using at least one of the measured electrocardiogram or pulse wave; And calculating the blood pressure value by applying the obtained pulse wave propagation time, pulse wave analysis information, and information about the physical and physical characteristics of the subject input by the subject to a regression equation. The method of claim 1, wherein the pulse wave transmission time, And a time difference between the time at which the peak value of the R-wave of the electrocardiogram appears and the time at which the predetermined value of the measured pulse wave appears. The method of claim 2, wherein the predetermined value of the measured pulse wave is, Any one of the measured peak value of the pulse wave, the peak value of the first derivative of the pulse wave, the peak value of the second derivative of the pulse wave, the 50% position value of the front wave, and the position value set by the subject. A blood pressure measuring method characterized by the above-mentioned. The method of claim 1, wherein the pulse wave analysis information, The blood pressure measuring method, characterized in that at least any one of the index indicating the vascular aging or vascular properties. The method of claim 4, wherein the vascular aging degree, Equation 1

Where a, b, c, and d are obtained by obtaining a first peak value, a second peak value, a third peak value, and a fourth peak value from a waveform obtained by secondly deriving the measured pulse wave; And a constant value set to a value corresponding to the obtained peak values. The method of claim 4, wherein the index indicating the vascular property is, And obtaining at least one or more time periods at which the peak value of the second derivative waveform of the pulse wave appears through a combination preset by the user. The method of claim 4, wherein the index indicating the vascular property is, A blood pressure measuring method characterized by showing the elasticity of blood vessels. According to claim 1, The physical body characteristics of the measured subject, And at least one of height, weight, age, sex, and arm length of the subject. The method of claim 1, wherein the regression equation of the blood pressure, Equation 2

Obtained by, wherein C1 to C4 is a blood pressure measuring method, characterized in that the constant obtained through the regression analysis. A sensor unit for measuring the electrocardiogram and pulse wave of the subject; Obtaining pulse wave propagation time and pulse wave analysis information based on at least one of the measured electrocardiogram or pulse wave, and regressing based on the obtained pulse wave propagation time and pulse wave analysis information and the physical characteristic information of the subject input from the subject And a control unit for applying the equation to calculate the blood pressure value. The method of claim 10, And an output unit for outputting the blood pressure value calculated by the control unit. The method of claim 11, Blood pressure measuring device comprising a storage unit for storing the blood pressure value calculated by the control unit. The regression equation of claim 10, wherein the control unit uses the regression equation to obtain a blood pressure value. The pulse wave transmission time, pulse wave analysis information, and body characteristic information are each multiplied by the coefficients obtained through the regression analysis, the blood pressure measuring device characterized in that the pulse wave transmission time, pulse wave analysis information, body characteristic information multiplied by the respective coefficients are added . The method of claim 10, wherein the sensor unit, Two electrodes adjacent to each other for electrocardiogram measurement; And at least one pressure sensor for pulse wave measurement. The method of claim 10, wherein the body characteristic information of the subject, And at least one of height, weight, age, sex, and arm length of the subject. The method of claim 10, wherein the pulse wave analysis information, Blood pressure measuring device, characterized in that obtained by analyzing the second derivative waveform of the measured pulse wave. The method of claim 16, wherein the pulse wave analysis information, The blood pressure measuring device, characterized in that at least one of the index indicating the vascular aging or vascular properties.

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