JPH07143970A - Wrist hemodynamometer - Google Patents

Abstract

PURPOSE:To make measurement of the blood pressure at a wrist possible by measuring the height from the plane where an elbow of the subject is placed to compare it with a specified value, letting the subject know the result of measurement and fitting accurately the height of the wrist to the height of the heart. CONSTITUTION:A wrist hemodynamometer B is an instrument wherein a main body 1 is fixed on a cuff belt 2 to which a wrist of a subject and in the main body 1, a pressure adjusting apparatus 11 for performing increasing and decreasing the pressure of the cuff belt 2, a blood pressure measuring part 12 and a blood pressure displaying part 13 for displaying the measured value of the blood pressure are provided. In addition, not only a controlling circuit 3 controlling these parts but also a measuring part 4 for measuring the height from the plane where an elbow of the subject is placed to the wrist hemodynamometer B, a specified value storing part 5 and a displaying part 6 are provided. It is possible thereby to detect whether the position of the height of the wrist hemodynamometer B is at the height of the heart and to display it on the displaying part 6 and it is also possible for the subject to position easily the wrist in the neighborhood of the height of the heart and to perform an accurate blood pressure measurement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrist sphygmomanometer which is attached to a wrist and measures blood pressure at this portion.

[0002]

2. Description of the Related Art When measuring blood pressure in the upper arm, it does not matter so much, but when measuring blood pressure in the wrist, it is the height of the wrist at the time of measurement. When the blood pressure is higher or lower than the heart position, the effect of the head pressure difference appears in the blood pressure measurement results.Therefore, the height of the wrist with the sphygmomanometer must match the height of the heart. .

For this purpose, an air pillow having an inclined surface is prepared, and when the elbow is placed on the table, the bending angle of the arm is regulated by the air pillow, whereby the height of the wrist sphygmomanometer attached to the wrist is adjusted. It is done so that it is almost at the heart level.

[0004]

However, in the air pillow, the bending angle of the arm cannot be strictly regulated, and even if the position where the elbow is attached is slightly displaced, the height of the wrist is greatly different. , It does not ensure accurate measurement. The present invention has been made in view of the above points, and an object thereof is to provide a wrist sphygmomanometer capable of accurately measuring the blood pressure on the wrist by accurately adjusting the wrist height to the heart height. There is.

[0005]

SUMMARY OF THE INVENTION The present invention, however, is a wrist sphygmomanometer attached to the wrist of a person to be measured, the height measurement for measuring the height from the surface on which the elbow of the person to be measured is placed. It is characterized in that it is provided with a means, a judging means for comparing the measured height with a predetermined value, and an informing means for indicating the judgment result by the judging means to the person to be measured. In place of the height measuring means, a distance measuring means for measuring a distance between an auxiliary member mounted near the heart of the person to be measured or an angle detecting means for detecting the inclination angle of the forearm of the person to be measured is provided. It may be

[0006]

According to the present invention, whichever detecting means is used, it is possible to detect and inform whether or not the height position is at the heart height. In addition to facilitating the positioning, it is possible to perform accurate blood pressure measurement.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiments. In this wrist sphygmomanometer B, a body 1 is attached to a cuff band 2 worn on the wrist of the person to be measured. A pressure increasing / decreasing device 11 for increasing or decreasing the pressure of the cuff band 2 is provided in
In addition to the blood pressure measurement unit 12, the blood pressure display unit 13 for displaying the measured blood pressure value, and the control circuit 3 for controlling these, the height from the surface on which the measured person's elbow is placed to the wrist blood pressure monitor is measured. Measuring unit 4 for measuring, predetermined value storage unit 5, and display unit 6
It has and. The predetermined value storage unit 5 here stores the height from the surface on which the elbow of the subject is placed to the heart, and the display unit 6 displays the height measured by the measurement unit 4 and the predetermined value storage unit 5. The result of comparison by the control circuit 3 with the predetermined value in is displayed.

Here, the measuring unit 4 does not have to measure the height itself from the surface on which the elbow of the person to be measured is placed to the wrist sphygmomanometer B wrapped around the wrist of the person to be measured. For example, the tilt angle of the forearm may be measured, and similarly, the value stored in the predetermined value storage unit 5 may be the tilt angle of the forearm when the wrist height becomes the predetermined value. This is good, but this point will be described later.

FIG. 2 shows an example of the measuring unit 4 which directly detects the height from the surface on which the elbow of the person to be measured is placed to the wrist sphygmomanometer B wound on the wrist of the person to be measured. Specifically, a gyro 40, which is an acceleration sensor, is provided as the measurement unit 4. That is, when the measurement subject himself wears the wrist sphygmomanometer B on his / her wrist, the wrist sphygmomanometer B is worn with the forearm ahead of the elbow on the table. The height of the heart is set, and the vertical movement distance L of the wrist when the forearm is raised is measured by the gyro 40. Although it is the acceleration α that can be directly detected by the gyro 40, the movement distance L can be obtained from the acceleration α and time.

The moving distance L output from the gyro 40 is compared with the heart height stored in the predetermined value storage unit 5, and if the two match, the display unit 6 displays this fact. The person to be measured can know whether or not the wrist on which the wrist sphygmomanometer B is worn is at the same height as the heart. It is preferable to start the blood pressure measurement operation with the output of this determination result, because the operation is less troublesome.

As the heart height stored in the predetermined value storage unit 5, for example, by using a measure or the like, the value when the height from the surface on which the elbow is placed to the heart is measured is input. It may be possible to do so, but here, the measurement result of the measurement unit 4 when the forearm is raised until the wrist comes to the measured heart height by standing a measure etc. from the surface on which the elbow is placed, By inputting the value when 7 is pressed, no specific numerical input operation is required. The configuration in which the measured value is stored in the predetermined value storage unit 5 can also be adopted in the embodiments described below.

The embodiment shown in FIG. 3 is a measuring unit 4 for directly detecting the height from the surface on which the elbow of the person to be measured is placed to the wrist sphygmomanometer B wrapped around the wrist of the person to be measured. An ultrasonic or optical distance measuring device 41 is adopted, and the vertical distance to the surface on which the elbow is placed, that is, the wrist height is measured by the distance measuring device 41, and this measured value is a predetermined value. By comparing with the value of the heart height stored in the storage unit 5,
The display unit 6 displays whether or not the wrist is at the same height as the heart.

If the angle of the upper arm or the distance from the body to the elbow when the elbow is placed on the table is determined, the distance from the heart to the wrist is determined by the height of the wrist (angle of the forearm). It is also possible to provide the measuring unit 4 for measuring the distance between the measurement subject 4 and the auxiliary member mounted near the heart of the person to be measured, and determine the height from this measurement interval. FIG. 4 shows an example of this case. The measuring unit 4 is oscillated by the oscillator 43 provided in the wrist sphygmomanometer 4, the oscillator 44 mounted near the heart, and both oscillators 43, 44. It comprises a receiver 45 for receiving sound waves.

In this case, when the heart height and the wrist height are matched with each other by using a measure or the like, both oscillators 4
The wavelength of the sound wave output from 3, 44 is set by both oscillators 43, 44.
If a sound wave of the same frequency is emitted from both oscillators 43, 44 when measuring the blood pressure, it will be placed on an extension of the line connecting oscillator 44 and oscillator 43 if the value is divided by an integer. The receiver 45 can detect whether or not the interval between the two oscillators 43 and 44 is an integral multiple of the wavelength based on the presence or absence of howling. In this case, the distance from the heart to the wrist is only an integer multiple of the wavelength (preferably an even multiple), and the distance between the two is not directly measured. It is possible to sufficiently determine whether or not the position of the wrist is near the heart height by separately defining the position of the wrist with the positioning tool 46.

The wavelength range of the sound wave to be used may be set according to the required accuracy. The distance between the heart and the wrist is measured from the difference in the time until the sound waves oscillated from both oscillators 43 and 44 reach the receiver 45, or from the oscillator 43 provided in the wrist sphygmomanometer B. The distance between the heart and the wrist may be measured by the time it takes for the sound to reach the receiver 45 mounted near the heart, and electromagnetic waves may be used instead of sound waves to transmit the signal between the heart and the wrist. The distance may be measured.

Since the height of the wrist with the elbow attached is determined by the tilt angle θ of the forearm,
As shown in FIG. 5, using a tilt angle sensor 47 that detects the tilt angle θ of the subject's forearm, the wrist is determined by whether the tilt angle matches the angle stored in the predetermined value storage unit 5. You may judge whether it is in the same height as.
As such an inclination angle sensor 47, an electrolytic solution sensor that changes the output voltage by changing the resistance value according to the inclination can be used, and the voltage change is A / D converted and then taken into the control circuit 3. .

A tilt angle switch 48 that turns on or off when the angle reaches a set angle may be used as the detection unit 4 of the tilt angle θ of the forearm. When raising the forearm from the horizontal state, the tilt angle switch 48 is turned on at a tilt angle at which the wrist is at the same height as the heart.
Such a tilt angle switch 4 consisting of a mercury switch, etc.
In the case of using No. 8, as shown in FIG. 6, the wrist sphygmomanometer B is provided with a rotating unit 9 which can be rotated, and the tilt angle switch 48 is provided on the rotating unit 9 to turn the tilt angle switch 48 on and off. It is desirable to be able to adjust the tilt angle θ of the forearm at the time of performing.

As shown in FIG. 7, if an inclination angle switch 48a which is turned on when the angle is less than a predetermined angle and an inclination angle switch 48b which is turned on when the angle exceeds the predetermined angle are provided, the inclination angle switch 48a is provided. When the wrist is low, only the tilt angle switch 48a is turned on, when the wrist is high, only the tilt angle switch 48b is turned on, and when the wrist comes to a proper height, both tilt angle switches 48a and 48b are turned off. Therefore, as in the case of using the tilt angle sensor 47, not only is the wrist at an appropriate height, but the current height of the wrist is lower than the appropriate height (FIG. 8A).
It can also be determined whether it is high (FIG. 8B).

Therefore, the notifying means in this case is not provided with only one light emitting diode LED which is turned on when both the tilt angle switches 48a and 48b are turned off as shown in FIG. 9, but is shown in FIG. As described above, the light emitting diode LE that lights up only when the tilt angle switch 48a is turned on
D3, the light emitting diode LED1 that lights up only when the tilt angle switch 48b is on, and both tilt angle switches 48
Light-emitting diode L that lights when both a and 48b are off
It is preferable to provide three ED2s.

As shown in FIG. 11, n tilt angle switches 48 ₁ to 48 n are provided and the tilt angles at which these tilt angle switches 48 _{1 to} 48 n are turned on may be slightly different. In addition to determining whether or not the wrist is at an appropriate height, it is possible to determine whether the current height of the wrist is lower or higher than the optimal height, and the proper forearm inclination angle when the wrist is at heart height. It becomes possible to perform adjustment for the individual difference of θ and the like without changing the mounting angles of the tilt angle switches 48 _{1 to} 48 n. Also, if such a configuration, the light-emitting display in informing unit, as shown in FIG. 12, the inclined angle switch 48 ₁
Alternatively, the level meters LM may be formed by arranging the light emitting diodes L _{1 to} Ln responding to the turning on of up to 48n.

FIG. 13 shows an addition of a tilt angle switch 48s capable of measuring the twist angle of the wrist. The blood pressure can be measured without the wrist being twisted inward or outward. If only the twist to the inner side or the outer side is detected, the tilt angle switch 48s is set to 1
If you want to discriminate the twist step by step, provide a plurality of twists.

As the notifying means, only means for displaying using a light emitting diode is shown, but a means such as a buzzer may be used, or both of them may be used for notifying. In addition, the pillow C as shown in FIGS.
It does not prevent the use of D. The pillow C shown in FIG. 15 is
It is shown that the inclination angle of the upper surface can be adjusted by changing the locking position of the stopper 91.

[0023]

As described above, according to the present invention, it is possible to detect whether or not the wrist is at the same height as the heart, and to notify the person. In addition to being easy to position in the vicinity, it is possible to always perform accurate blood pressure measurement while avoiding the influence of the head pressure difference when the wrist is not at the same height as the heart.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of an embodiment.

FIG. 2 is a side view showing an example of the above.

FIG. 3 is a side view showing another example of the above.

FIG. 4 is a side view showing still another example of the same.

FIG. 5 is a side view showing another example of the same.

FIG. 6 is a side view showing still another example of the above.

FIG. 7 shows an example in which a plurality of tilt angle switches are provided, and FIGS. 7A, 7B, and 7C are operation explanatory diagrams.

FIG. 8 is a side view of the above.

FIG. 9 is a circuit diagram showing an example of the above display circuit.

FIG. 10 is a circuit diagram showing another example of the above display circuit.

FIG. 11 is an explanatory diagram of another example in which a plurality of tilt angle switches are provided.

FIG. 12 is a front view showing an example of a display unit corresponding to the above.

FIG. 13 is a plan view of another example.

FIG. 14 is a side view showing a pillow.

FIG. 15 shows another example of a pillow, (a) is a side view and (b) is a perspective view.

Claims (16)

[Claims] 1. A wrist sphygmomanometer worn on the wrist of a person to be measured, the height measuring means for measuring a height from a surface on which the elbow of the person to be measured is placed, and the measured height as a predetermined value. A wrist sphygmomanometer, comprising: determination means for comparison and notification means for indicating the determination result by the determination means to the person to be measured. 2. The wrist sphygmomanometer according to claim 1, wherein the measuring means comprises an acceleration sensor and a calculation circuit for calculating the vertical movement distance from the acceleration detected by the acceleration sensor. 3. The wrist sphygmomanometer according to claim 1, wherein the measuring means is a distance measuring means for measuring the distance to the surface on which the elbow is placed by ultrasonic waves or light. 4. A wrist sphygmomanometer worn on the wrist of a person to be measured, and an interval measuring means for measuring an interval between the wrist sphygmomanometer and an auxiliary member worn near the heart of the person to be measured. A wrist sphygmomanometer, comprising: a determination unit that determines the height, and a notification unit that indicates the determination result by the determination unit to the measurement subject. 5. A wrist sphygmomanometer attached to the wrist of a person to be measured, comprising angle detecting means for detecting a tilt angle of a forearm of the person to be measured, and determining means for determining height from the detected angle. A wrist sphygmomanometer, which is provided with an informing means for indicating the determination result by the means to the measurement subject. 6. The wrist sphygmomanometer according to claim 5, wherein the forearm angle detection means is a tilt angle sensor that outputs an output according to the tilt angle. 7. The wrist sphygmomanometer according to claim 6, wherein the inclination angle sensor is an electrolyte sensor. 8. The angle detecting means is a switch that is turned on / off according to the inclination angle of the forearm.
The wrist blood pressure monitor described. 9. The wrist sphygmomanometer according to claim 8, wherein the on / off angle of the switch is adjustable. 10. A plurality of switches that are turned on and off at different tilt angles are provided.
The wrist blood pressure monitor described. 11. A first switch, which is turned on or off when the angle is less than a predetermined angle, and a second switch which is turned on or off when the angle exceeds the predetermined angle. The wrist blood pressure monitor described. 12. The wrist sphygmomanometer according to claim 8, wherein a plurality of switches that are turned on and off at different angles are provided. 13. The blood pressure measuring operation is started according to the output result of the judging means.
Or the wrist sphygmomanometer according to 4 or 5. 14. The wrist sphygmomanometer according to claim 1, wherein the determination reference value in the determination means is a measurement value obtained by the measurement unit at the time of calibration is taken into the determination unit. 15. The notifying means is for notifying three states that the measured value matches the predetermined value, exceeds the predetermined value, and is less than the predetermined value. Item 1. The wrist sphygmomanometer according to Item 1, 4 or 5. 16. The wrist sphygmomanometer according to claim 1, wherein the notifying means is a level meter that displays a measured value.