JP3700048B2 - Electronic blood pressure monitor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic sphygmomanometer that is hardly affected by noise and arti factor caused by body movement.
[0002]
[Prior art]
Conventionally, there is a finger type sphygmomanometer as a sphygmomanometer using a photoelectric pulse wave. A conventional sphygmomanometer such as this finger type sphygmomanometer is configured as a method for determining the blood pressure by measuring the pulsation of a finger artery compressed with a cuff at a shallow portion from the body surface. For this reason,
i) The distance between the light emitting element and the light receiving element is short.
ii) Body motion noise is superimposed on the photoelectric pulse wave signal due to body motion during measurement.
Therefore, there are the following problems (1) and (2).
(1) At a site where the artery is deep from the body surface (for example, the upper arm), it is difficult to measure the pulse wave, and it is difficult to measure the blood pressure by the photoelectric pulse wave method.
(2) In measurement during body movement, measurement errors frequently occur or measurement accuracy deteriorates.
[0003]
Therefore, in order to solve these problems (1) and (2), the present applicant
a) Light having a wavelength (700 to 1000 nm) having a low attenuation rate in a living body is used as measurement light.
b) The distance between the light emitting element and the light receiving element is set within a predetermined range (20 to 90 mm).
c) A plurality of sensors are used for photoelectric pulse wave detection.
We have developed a sphygmomanometer that is capable of obtaining a photoelectric pulse wave signal even from the pulsation of an artery deep in the body surface.
[0004]
[Problems to be solved by the invention]
By the way, in the latter sphygmomanometer, which signal is most suitable for the blood pressure calculation among photoelectric pulse wave signals obtained by a plurality of sensors is determined by the attributes of the measurement subject (for example, the circumference of the measurement site, the artery Therefore, it is necessary to select an appropriate sensor for each person to be measured. However, since the measurement subject's attributes are not information that the measurement subject can easily know, if a proper sensor cannot be selected on the sphygmomanometer side, the blood pressure value is not so accurate as a result. .
[0005]
Therefore, the present invention has been made paying attention to such a problem, and it is possible to reliably obtain a photoelectric pulse wave signal from an artery located deep from the body surface, and to measure blood pressure regardless of the attribute of the subject. It is an object of the present invention to provide an electronic sphygmomanometer that realizes selection of an optimum sensor for the measurement and measurement of blood pressure with high accuracy by them.
[0006]
[Means for Solving the Problems]
To achieve the above object, an electronic sphygmomanometer according to claim 1 of the present invention includes a cuff for pressurizing a measurement site of a living body, a pressure control means for pressurizing / depressurizing the inside of the cuff, and a pressure within the cuff. A pressure detection means for detecting a plurality of pulse wave component detection photoelectric sensors provided at different positions of the cuff, and at least one body motion component detection means provided on the cuff and detecting a body motion component A blood pressure calculation means for calculating a blood pressure by removing a body motion component obtained by the body motion component detection means from a pulse wave component obtained by the photoelectric sensor, and a plurality of photoelectric sensors among the plurality of photoelectric sensors The signal power is calculated by frequency analysis of the photoelectric pulse wave signal obtained by the above, and the signal power of the pulse wave component obtained by each photoelectric sensor and the body motion component are compared. the sensor, the most on the attributes of the subject And a photoelectric sensor selecting means for selecting as a photoelectric sensor in the Do position, characterized in that to calculate the blood pressure using a pulse wave component obtained by the photoelectric sensor selected by the photoelectric sensor selecting means.
[0007]
This electronic sphygmomanometer uses the body motion component (noise component) detected by the body motion component detection means to reduce only the noise component from the pulse wave signal of the pulse wave component detection photoelectric sensor on which the noise component is superimposed. It is. At that time, in order to accurately calculate the blood pressure, a technique (for example, photoelectric pulse wave) that directly captures the pulsation of the artery is used for pulse wave detection. This technique can directly capture the arterial pulsation in the central cuff that is not affected by the distribution of cuff pressure, and shows characteristic changes in systolic and diastolic blood pressures as well as Korotkoff sounds. Blood pressure can be measured.
[0008]
However, it is difficult to measure the pulse wave at the site where the artery is deep from the body surface (for example, the upper arm) as described above. Therefore, by providing a plurality of pulse wave component detection photoelectric sensors at different positions of the cuff, preferably the distance between the light emitting element and the light receiving element of the photoelectric sensor is 20 to 90 mm. By using a pulse wave measurement light with a wavelength (700 to 1000 nm) having a low attenuation rate in a living body, it is possible to capture the pulsation of an artery located deep from the body surface as a photoelectric pulse wave. Become.
[0009]
Here, the reason why a plurality of photoelectric sensors are provided at different positions of the cuff is that the position of the photoelectric sensor optimal for blood pressure calculation differs depending on the attribute of the person being measured. However, the attributes of the person to be measured here are the circumference of the measurement site, the depth from the body surface of the artery, the thickness of the subcutaneous fat, and the like.
In the electronic sphygmomanometer of the present invention, the photoelectric sensor selection means calculates the signal power by performing frequency analysis on the photoelectric pulse wave signals obtained by the plurality of photoelectric sensors among the plurality of photoelectric sensors for detecting the pulse wave component. compares the signal power of the pulse wave component and the body motion component obtained by the photoelectric sensor, the pulse wave component to the body movement component ratio is the highest photoelectric sensors are selected as a photoelectric sensor located at the optimum position to advance blood pressure calculation Since the blood pressure is calculated using the pulse wave component obtained by the selected photoelectric sensor, the above problem can be solved. In other words, a photoelectric pulse wave signal can be reliably obtained from an artery located deep from the body surface, and an optimal sensor for blood pressure measurement can be selected regardless of the attributes of the measurement subject, thus performing highly accurate blood pressure measurement. be able to.
[0010]
In the present invention, the body motion component detecting means is a speed sensor, an acceleration sensor, a position sensor, a displacement sensor, an angle sensor, an azimuth sensor, and an inclination sensor in the case of a sensor that converts and measures the movement of a living body into a physical quantity. In the case of a sensor that measures a biological volume (for example, blood volume) that changes according to the movement of the biological body, a photoelectric sensor or the like may be used.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments.
The configuration of the electronic blood pressure monitor according to the first embodiment is shown in a block diagram in FIG. This electronic sphygmomanometer includes a cuff 1 for pressurizing a measurement site of a living body, a pressure pump (pressure control means) 2 for pressurizing the inside of the cuff 1, and an exhaust valve (pressure control means) 3 for reducing the pressure inside the cuff 1. And a pressure sensor (pressure detecting means) 4 for detecting the pressure in the cuff 1, a display 5 for displaying the calculated blood pressure value, etc., a pressurizing pump 2, an exhaust valve 3, a display 5 and the like. A CPU 6, an amplifier 7 that amplifies the output from the pressure sensor 4, and an A / D converter 8 that converts an analog signal from the amplifier 7 into a digital signal and inputs the digital signal to the CPU 6. However, the configuration so far is the same as that of the conventional blood pressure monitor.
[0012]
This electronic sphygmomanometer has a plurality of pulse wave component detection photoelectric sensors 10 ₋₁ ,..., 10 _−n provided in the cuff 1 and one body motion component detection means also provided in the cuff 1. and a acceleration sensor 11, the photoelectric sensor 10 _-1, ..., 10 _-n are provided at different positions of the cuff 1, the pulse wave component CPU6 photoelectric sensor 10 _-1, ..., obtained in 10 _-n Among the plurality of photoelectric sensors 10 ₋₁ ,..., 10 _−n that are optimal for the attributes of the person to be measured. It has a photoelectric sensor selection function for selecting a photoelectric sensor in the above, and is characterized in that the blood pressure is calculated using a pulse wave component obtained by the selected photoelectric sensor.
[0013]
The photoelectric sensors 10 ₋₁ ,..., 10 _−n are provided so that the distance between the light emitting element and the light receiving element is in the range of 20 to 90 mm as described above, and have a wavelength with a small attenuation rate in the living body ( 700 to 1000 nm).
The photoelectric pulse wave signals of the photoelectric sensors 10 _-1 ,..., 10 _-n are amplified by the amplifiers 12 _-1 ,..., 12 _-n respectively, and further converted into digital signals by the A / D converter 8. Is input. The body motion signal of the acceleration sensor 11 is amplified by the amplifier 13, converted to a digital signal by the A / D converter 8, and then input to the CPU 6.
[0014]
The electronic sphygmomanometer according to the second embodiment shown in FIG. 2 uses one photoelectric sensor 14 instead of the acceleration sensor 11 as the body motion component detection means, and the third embodiment shown in FIG. The electronic blood pressure monitor according to the embodiment uses a plurality of photoelectric sensors 14 ₋₁ ,..., 14 _−n as body motion component detection means. Other configurations are the same as those of the electronic sphygmomanometer of the first embodiment.
[0015]
FIG. 4 shows a schematic cross-sectional view of the cuff 1 in the electronic blood pressure monitor (see FIG. 1) of the first embodiment. FIG. 4 shows a state where the cuff 1 is attached to the upper arm 40, and a bone 41 and an artery 42 extend into the upper arm 40. Here, the acceleration sensor 11 for detecting body motion components is attached to the front side of the cuff 1, and a plurality (three) of photoelectric sensors 10 ₋₁ , 10 ₋₂ , and 10 ₋₃ for detecting pulse wave components are cuff 1. It is attached to the inside (body surface facing side). The photoelectric sensors 10 ₋₁ , 10 ₋₂ , and 10 ₋₃ are not composed of a light emitting element and a light receiving element, but the light emitting element 20 is common to all the photoelectric sensors, and the light receiving elements 21, 22, and 23 are used. Is for each photoelectric sensor. The light emitting element 20 and the light receiving elements 21 to 23 are arranged at different positions in the circumferential direction of the cuff 1 (transverse direction of the upper arm 40), and the light receiving elements 21, 22, and 23 are arranged at different positions from the light emitting element 20, respectively. Has been. Of course, the light emitting element 20 and the light receiving elements 21 to 23 are positioned in the predetermined range (20 to 90 mm).
[0016]
FIG. 5 shows a schematic sectional view of the cuff 1 in the electronic blood pressure monitor (see FIG. 2) of the second embodiment. In FIG. 5, the photoelectric sensor 14 for detecting body motion components is not composed of a light emitting element and a light receiving element, and the light emitting elements are the light emitting elements 20 of the photoelectric sensors 10 ₋₁ , 10 ₋₂ , 10 ₋₃ for detecting the pulse wave component. And only the light receiving element 31 is disposed on the opposite side of the light receiving elements 21 to 23 with the light emitting element 20 interposed therebetween.
[0017]
FIG. 6 shows a schematic cross-sectional view of the cuff 1 in the electronic blood pressure monitor (see FIG. 3) of the third embodiment. In FIG. 6, a plurality (three) of photoelectric sensors 14 _-1 , 14 _-2 , and 14 _-3 for detecting body motion components have photoelectric elements for detecting pulse wave components as in the case of FIG. Common to the light emitting elements 20 of the sensors 10 ₋₁ , 10 ₋₂ , and 10 ₋₃ , the three light receiving elements 31, 32, and 33 are arranged at different positions. In this case, the distance between the light emitting element 20 and each of the light receiving elements 31, 32, 33 is set to be the same as the distance between the light emitting element 20 and the light receiving elements 21, 22, 23, respectively.
[0018]
In particular, in the case of FIG. 6, the fundamental frequency of the body motion component is obtained when the photoelectric sensors 10 ₋₁ , 10 ₋₂ , and 10 ₋₃ for detecting the pulse wave component at the optimum position for the attribute of the measurement subject are selected. As the body motion signal used for this, the output of any one of a plurality (three) of photoelectric sensors 14 _-1 , 14 _-2 and 14 _-3 for detecting body motion components may be used. This is because only the fundamental frequency of the body motion component is required at the time of selection.
[0019]
The advantage of providing a plurality of photoelectric sensors 14 _-1 , 14 _-2 , 14 _-3 for detecting body motion components is effective in removing body motion noise superimposed on the pulse wave. That is, noise removal is performed using a body motion component detection photoelectric sensor corresponding to the pulse wave component detection photoelectric sensor selected as being in an optimum position for the measurement subject's attribute. Specifically, when the photoelectric sensor 10 ₋₁ (that is, the light receiving element 21) for detecting the pulse wave component is selected, the body motion component detection located at the same distance as the distance between the light emitting element 20 and the light receiving element 21 is detected. Noise is removed using a body motion signal obtained by the photoelectric sensor 14 _-1 (that is, the light receiving element 31). By obtaining both the photoelectric pulse wave signal and the body motion signal with the light receiving element located at the same distance from the light emitting element 20, the amount of change of the biological quantity as the body motion component works in the same way on the photoelectric pulse wave signal and the body motion signal. Therefore, a body motion signal having a high correlation with the body motion component superimposed on the photoelectric pulse wave signal can be obtained, and the noise removal efficiency is increased.
[0020]
Furthermore, in the cuff 1 shown in FIGS. 4 to 6, the pulse wave component detection and body motion component detection photoelectric sensors are both centered in the direction perpendicular to the circumferential direction of the cuff 1 (the extending direction of the artery 42). It is arranged on the terminal side (hand side) of the living body 1 from the center. For this reason, the photoelectric pulse wave signal and the body motion signal can be accurately detected. This is because, even if the cuff 1 is pressurized more than the maximum blood pressure on the heart side from the center of the cuff 1, the compression force is weak compared to the cuff central portion, so that the artery 42 is not completely blocked. This is because a pulse wave corresponding to the heartbeat may occur.
[0021]
By the way, the selection of the photoelectric sensor for detecting the pulse wave component at the optimum position for the attribute of the person to be measured can be executed in various processes depending on whether the blood pressure is measured in the cuff decompression process or the pressurization process. . For example, when the selection is performed by the reduced pressure measurement, the operation of the electronic sphygmomanometer configured as shown in FIGS. 3 and 6 will be described with reference to the flowchart of FIG. In this case, blood pressure is measured during the decompression process. That is, as shown in FIG. 9, the cuff 1 is once pressurized to a maximum blood pressure or higher, and a photoelectric sensor for detecting a pulse wave component is selected in this pressurization process. As a blood pressure determination method, for example, the pulse wave appearance point in the decompression process is set as the maximum blood pressure, and the pulse wave vanishing point is set as the minimum blood pressure. As another blood pressure determination method, there is also a method of calculating an envelope of pulse wave amplitude and determining by setting a predetermined threshold value.
[0022]
First, in step (hereinafter abbreviated as ST) 1, after all variables are initialized, cuff pressurization is started (ST2). During this pressurization, photoelectric pulse wave signals are measured by the photoelectric sensors 10 ₋₁ , 10 ₋₂ , and 10 ₋₃ for detecting pulse wave components, which are composed of the light emitting element 20 and the light receiving elements 21 to 23, and the light emitting element. A body motion signal is measured by photoelectric sensors 14 _-1 , 14 _-2 , and 14 _-3 for detecting body motion components composed of 20 and light receiving elements 31 to 33 (ST3).
[0023]
Next, a pulse wave component detection photoelectric sensor at a position optimal for the measurement subject's attribute is determined (ST4). As an optimal index of photoelectric pulse wave signal, the signal power is calculated by frequency analysis of the photoelectric pulse wave signal from each photoelectric sensor, and the pulse wave component and body motion component signal power at each signal power are compared, and the pulse wave The photoelectric sensor having the highest component-to-body movement component ratio (hereinafter referred to as the S / N ratio) is assumed to be a photoelectric sensor at a position optimal for the attribute of the measurement subject. A high S / N ratio means that a pulse wave component is captured better than body motion noise. Therefore, a photoelectric sensor that can obtain a signal power with the highest S / N ratio is a subject to be measured. It will be suitable for the attributes of. On the other hand, a low S / N ratio means that the pulse wave component is not sufficiently captured compared to body motion noise, so a photoelectric sensor that can only obtain a signal power with a low S / N ratio can be obtained. This is not suitable for the measurement subject's attributes, and in the subsequent body motion noise removal processing, a sufficient noise removal effect cannot be expected, and accurate blood pressure calculation cannot be performed.
[0024]
After the pulse wave component detection photoelectric sensor at the optimum position for the measurement subject's attribute is determined as described above, the body motion component detection photoelectric sensor corresponding to the selected pulse wave component detection photoelectric sensor is determined. Is determined (ST5). That is, in FIG. 6, when, for example, the photoelectric sensor 10 ₋₃ (light receiving element 23) is selected as the pulse wave component detecting photoelectric sensor at the optimum position for the measurement subject's attribute, the light emitting element 20 and the light receiving element are selected. The photoelectric sensor 14 _-3 (light receiving element 33) located at the same distance as the distance to the light source 23 is determined.
[0025]
When the internal pressure of the cuff reaches or exceeds the maximum blood pressure, pressure reduction at a constant pressure is started (ST6), and cuff pressure measurement, photoelectric pulse wave signal measurement, and body motion signal measurement are performed during the pressure reduction process (ST7). Based on the measurement result, the body motion component that becomes noise is removed from the photoelectric pulse wave signal (ST8).
A specific method for detecting the pulse wave component and the body motion component from the signal power calculated by frequency analysis of the photoelectric pulse wave signal is as follows. First, of the plurality (three) of photoelectric sensors 14 _-1 , 14 _-2 , and 14 _-3 for detecting body motion components, the frequency of body motion signals measured by an arbitrary photoelectric sensor as described above is analyzed. The fundamental frequency of the body motion component is calculated. Subsequently, in the signal power obtained by frequency analysis of the photoelectric pulse wave signal, the component that matches the fundamental frequency of the body motion component obtained previously becomes the signal power of the body motion component, and in the remaining signal power, the body power The component obtained by removing the harmonic component of the fundamental frequency of the dynamic component is the signal power of the pulse wave component.
[0026]
For example, FIGS. 11 and 12 show blood pressure measurement during body movement, FIG. 11 shows photoelectric pulse wave signals obtained by three photoelectric sensors for detecting pulse wave components, and FIG. 12 shows detection of two body movement components. The body motion signal obtained by the photoelectric sensor for the purpose is shown. As is clear from this, in the signal power of the photoelectric pulse wave signal, the component that matches the fundamental frequency of the body motion component is the signal power of the body motion component.
[0027]
After the body motion component is removed from the photoelectric pulse wave signal, the maximum blood pressure and the minimum blood pressure are calculated (ST9), and the obtained blood pressure value is displayed (ST10).
The above flow chart of FIG. 7 is a case where the selection of the photoelectric sensor for detecting the pulse wave component at the optimum position for the attribute of the measurement subject is performed by the reduced pressure measurement. It is shown in FIG. In this case, blood pressure is measured during cuff pressurization. The selection of the photoelectric sensor for detecting the pulse wave component is performed in this preliminary pressurization process, for example, by performing pre-pressurization before pressurization for blood pressure measurement, as shown in FIG. This is because in the pressurization measurement, when the cuff pressure is lower than the minimum blood pressure, there may be no section in which a pulse wave appears.
[0028]
First, after initialization is performed in ST11, pre-pressurization of the cuff is performed (ST12), and a photoelectric pulse wave signal and a body motion signal are measured during the pre-pressurization (ST13). Then, in the same manner as described above, the pulse wave component detection photoelectric sensor at the position optimal for the measurement subject's attribute is determined (ST14), and the body motion component detection photoelectric sensor is determined accordingly (ST15). ).
[0029]
Next, the cuff is pressurized above the maximum blood pressure (ST16), and the cuff pressure, photoelectric pulse signal, and body motion signal are measured during the pressurization process (ST17). The body motion component is removed from the wave signal (ST18). Thereafter, the maximum blood pressure and the minimum blood pressure are calculated (ST19), the obtained blood pressure value is displayed (ST20), and the cuff is quickly exhausted (ST21).
[0030]
The flow charts of FIGS. 7 and 8 show the case where the selection of the photoelectric sensor for detecting the pulse wave component at the optimum position for the measurement subject's attribute is performed by the decompression measurement and the pressurization measurement, respectively. Both measurement and pressurization measurement can be performed during blood pressure calculation (ST9 in FIG. 7 and ST19 in FIG. 8).
Moreover, although the said embodiment concerns the selection in the blood pressure measurement during body movement, it is the same also in the blood pressure measurement at rest. That is, in this case, the photoelectric sensor having the highest signal power obtained by frequency analysis of the photoelectric pulse wave signal is the photoelectric sensor at the optimum position for the attribute of the measurement subject.
[0031]
For example, FIG. 13 and FIG. 14 show blood pressure measurement in a resting state, FIG. 13 shows photoelectric pulse wave signals obtained by three photoelectric sensors for detecting pulse wave components, and FIG. The body motion signal obtained by this photoelectric sensor is shown. In this case, in the signal power of the photoelectric pulse wave signal, the photoelectric sensor (here, sensor 3) having the highest signal power is optimal.
[0032]
Furthermore, it can be similarly determined whether the blood pressure measurement is performed during body movement or in a resting state. That is, as shown in FIG. 14, the value of the signal power obtained by frequency analysis of the body motion signal measured by the photoelectric sensor for body motion component detection is compared with a preset threshold value. When the signal power is greater than the threshold, it is determined that the body motion noise is detected, and when a large amount of body motion noise is detected, it is determined that the measurement is during body motion. On the contrary, when the signal power is smaller than the threshold value, it is determined that the body motion noise is not detected, and when the body motion noise is not detected at all or only a little is detected, it is determined that the measurement is at rest.
[0033]
In addition, the above flow chart is a case where a plurality of photoelectric sensors are used for detecting body motion components (see FIG. 3), but also in the case of a single acceleration sensor or photoelectric sensor (see FIGS. 1 and 2). It is the same. However, in this case, it is not necessary to determine the body motion component detection sensor in accordance with the selection of the pulse wave component detection photoelectric sensor.
[0034]
【The invention's effect】
Since the electronic sphygmomanometer of the present invention is configured as described above, it has the following effects.
(1) A photoelectric pulse wave signal can be reliably obtained from an artery located deep from the body surface.
(2) Of the plurality of pulse wave component detection photoelectric sensors, a pulse wave component detection photoelectric sensor optimal for blood pressure measurement can be selected regardless of the attribute of the measurement subject.
(3) The blood pressure can be measured with high accuracy by (1) and (2).
(4) According to the invention described in claim 3 , a body motion signal having a high correlation with the body motion component superimposed on the photoelectric pulse wave signal can be obtained, and the noise removal efficiency is increased .
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an electronic sphygmomanometer according to a first embodiment.
FIG. 2 is a block diagram showing a configuration of an electronic blood pressure monitor according to a second embodiment.
FIG. 3 is a block diagram showing a configuration of an electronic sphygmomanometer according to a third embodiment.
FIG. 4 is a schematic cross-sectional view of a cuff in the electronic blood pressure monitor according to the first embodiment.
FIG. 5 is a schematic cross-sectional view of a cuff in the electronic blood pressure monitor according to the second embodiment.
FIG. 6 is a schematic cross-sectional view of a cuff in the electronic blood pressure monitor according to the third embodiment.
FIG. 7 is a flowchart showing the operation of the electronic sphygmomanometer according to the third embodiment when blood pressure measurement is performed in the cuff decompression process.
FIG. 8 is a flowchart showing the operation of the electronic sphygmomanometer according to the third embodiment when blood pressure is measured in the cuff pressurization process.
FIG. 9 is a graph showing the relationship between time and cuff pressure when blood pressure measurement is performed in the cuff depressurization process.
FIG. 10 is a graph showing the relationship between time and cuff pressure when blood pressure measurement is performed in the cuff pressurization process.
FIG. 11 is a graph showing a photoelectric pulse wave signal obtained by a photoelectric sensor for detecting a pulse wave component in the electronic sphygmomanometer according to the embodiment in the case of blood pressure measurement during body movement.
FIG. 12 is a graph showing a body motion signal obtained by a photoelectric sensor for body motion component detection in the electronic sphygmomanometer according to the embodiment in the case of blood pressure measurement during body motion.
FIG. 13 is a graph showing a photoelectric pulse wave signal obtained by a photoelectric sensor for detecting a pulse wave component in the electronic sphygmomanometer of the embodiment in the case of blood pressure measurement at rest.
FIG. 14 is a graph showing a body motion signal obtained by a photoelectric sensor for body motion component detection in the electronic sphygmomanometer of the embodiment in the case of blood pressure measurement under rest.
[Explanation of symbols]
1 Cuff 2 Pressure pump (pressure control means)
3 Exhaust valve (pressure control means)
4 Pressure sensor (pressure detection means)
6 CPU (blood pressure calculation means, photoelectric sensor selection means)
10 ₋₁ ,..., 10 _−n Pulse wave component detection photoelectric sensor 11 Body motion component detection acceleration sensor (body motion component detection means)
14 ₋₁ ,..., 14 _-n Photoelectric sensor for body motion component detection (body motion component detection means)

Claims (6)

A cuff for pressurizing the measurement site of the living body, a pressure control means for pressurizing and depressurizing the inside of the cuff, a pressure detecting means for detecting the pressure in the cuff, and a plurality of pulses provided at different positions of the cuff Obtained by the body motion component detection means from the pulse wave component obtained by the photoelectric sensor for detecting the wave component, at least one body motion component detection means provided on the cuff and detecting the body motion component A blood pressure calculation means for removing a body motion component and calculating blood pressure, and among the plurality of photoelectric sensors, photoelectric pulse wave signals obtained by the plurality of photoelectric sensors are subjected to frequency analysis to calculate a signal power, and each photoelectric sensor Compares the signal power of the pulse wave component and the body motion component obtained by the above , and selects the photoelectric sensor with the highest ratio of the pulse wave component to the body motion component as the photoelectric sensor at the optimum position for the attributes of the person being measured With selection means The electronic sphygmomanometer is characterized in that to calculate the blood pressure using a pulse wave component obtained by the photoelectric sensor selected by the photoelectric sensor selecting means. The photoelectric sensor selection means calculates the signal power by frequency analyzing photoelectric pulse wave signals obtained by a plurality of photoelectric sensors, and frequency analyzes the body motion component obtained by the body motion component detection means. The fundamental frequency is calculated, and among the components in the signal power of the photoelectric pulse wave, a component in which the fundamental frequency of the body motion component matches the frequency of the signal power of the photoelectric pulse wave is defined as the body motion component. Item 2. The electronic blood pressure monitor according to Item 1. A cuff for pressurizing the measurement site of the living body, a pressure control means for pressurizing and depressurizing the inside of the cuff, a pressure detecting means for detecting the pressure in the cuff, and a plurality of pulses provided at different positions of the cuff Obtained by the body motion component detection means from the pulse wave component obtained by the photoelectric sensor for detecting the wave component, at least one body motion component detection means provided on the cuff and detecting the body motion component A blood pressure calculation unit that calculates a blood pressure by removing a body motion component; and a photoelectric sensor selection unit that selects a photoelectric sensor at a position optimal for the attribute of the person to be measured among a plurality of photoelectric sensors. In the electronic sphygmomanometer that calculates the blood pressure using the pulse wave component obtained by the photoelectric sensor selected by the sensor selecting means, the body motion component detecting means is a plurality of measuring the amount of living body that changes according to the movement of the living body. Pieces The plurality of body motion component detection photoelectric sensors are provided at different positions of the cuff corresponding to the plurality of pulse wave component detection photoelectric sensors. Among the photoelectric sensors for detection, a body motion signal obtained by the photoelectric sensor for body motion component detection corresponding to the photoelectric sensor for pulse wave component detection at the position optimal for the attribute of the measurement subject is calculated in blood pressure calculation. An electronic sphygmomanometer, which is used for removing body motion components . A cuff for pressurizing the measurement site of the living body, a pressure control means for pressurizing and depressurizing the inside of the cuff, a pressure detecting means for detecting the pressure in the cuff, and a plurality of pulses provided at different positions of the cuff Obtained by the body motion component detection means from the pulse wave component obtained by the photoelectric sensor for detecting the wave component, at least one body motion component detection means provided on the cuff and detecting the body motion component A blood pressure calculation unit that calculates a blood pressure by removing a body motion component; and a photoelectric sensor selection unit that selects a photoelectric sensor at a position optimal for the attribute of the person to be measured among a plurality of photoelectric sensors. In the electronic sphygmomanometer that calculates the blood pressure using the pulse wave component obtained by the photoelectric sensor selected by the sensor selection means, the blood pressure calculation is performed during the decompression process in the cuff, and the photoelectric sensor by the photoelectric sensor selection means Selection of capacitors, the electronic sphygmomanometer, which comprises carrying out in the pressurization-pressure in the cuff. A cuff for pressurizing the measurement site of the living body, a pressure control means for pressurizing and depressurizing the inside of the cuff, a pressure detecting means for detecting the pressure in the cuff, and a plurality of pulses provided at different positions of the cuff Obtained by the body motion component detection means from the pulse wave component obtained by the photoelectric sensor for detecting the wave component, at least one body motion component detection means provided on the cuff and detecting the body motion component A blood pressure calculation unit that calculates a blood pressure by removing a body motion component; and a photoelectric sensor selection unit that selects a photoelectric sensor at a position optimal for the attribute of the person to be measured among a plurality of photoelectric sensors. In the electronic sphygmomanometer that calculates the blood pressure using the pulse wave component obtained by the photoelectric sensor selected by the sensor selection means, the blood pressure calculation is performed during the decompression process in the cuff, and the photoelectric sensor by the photoelectric sensor selection means Selection of capacitors, the electronic sphygmomanometer, which comprises carrying out in parallel with the blood pressure calculation. A cuff for pressurizing the measurement site of the living body, a pressure control means for pressurizing and depressurizing the inside of the cuff, a pressure detecting means for detecting the pressure in the cuff, and a plurality of pulses provided at different positions of the cuff Obtained by the body motion component detection means from the pulse wave component obtained by the photoelectric sensor for detecting the wave component, at least one body motion component detection means provided on the cuff and detecting the body motion component A blood pressure calculation unit that calculates a blood pressure by removing a body motion component; and a photoelectric sensor selection unit that selects a photoelectric sensor at a position optimal for the attribute of the person to be measured among a plurality of photoelectric sensors. In the electronic sphygmomanometer that calculates the blood pressure using the pulse wave component obtained by the photoelectric sensor selected by the sensor selection means, the blood pressure calculation is performed in the pressurization process in the cuff, and is performed by the photoelectric sensor selection means. Photoelectric Selection of capacitors, the electronic sphygmomanometer, which comprises carrying out in parallel with the blood pressure calculation.

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