JP3420409B2 - Measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for obtaining a pulse rate, a pitch and the like based on a pulse wave signal and a body movement signal detected by a sensor. More specifically, the present invention relates to a technique for determining whether the measured pulse rate or pitch is a normal value or an abnormal value.

[0002]

2. Description of the Related Art When a pulse wave or body movement is measured by a sensor, and a pulse rate or a pitch is obtained based on the measured data,
An abnormal value may appear in the detection result of the sensor due to the abnormality that occurred during the measurement. When a physical condition or the like is judged including such an abnormal value, the judgment is erroneous. Therefore, in the conventional measuring device, the measured pulse rates at a plurality of points are arranged in ascending or descending order, and one or two of the large value and the small value among them are arranged, and the average value of the remaining values is displayed in a liquid crystal display device or the like. Is displayed. Here, when a predetermined number of pulse rates are newly measured, the same processing is performed for these values. This average value is a so-called moving average value, and there is an advantage that the displayed result does not easily include an abnormal value due to noise or the like.

However, in the method using the moving average, when one value is measured over a relatively long time like the measurement of the pulse rate, it is not used for calculating a plurality of data and actually the average value. Since it is necessary to measure even the data, there are problems that the response of the display is low and the abnormal value cannot be reliably removed.

Therefore, while the previous measurement value or the average value of several measurement values measured immediately before is used as a reference value,
The reference value is multiplied by a constant coefficient to set the upper and lower limits, and the measured value depends on whether or not the current measurement result is within the range from the lower limit to the upper limit (in the window). A method for determining whether is normal or abnormal may be used. In this method, since the measured value is displayed only when the measured value this time is within the window, it is possible to improve the responsiveness of the display and prevent the abnormal value from being displayed.

[0005]

However, the conventional display method based on the window determination can accurately distinguish the normal value and the abnormal value when there is almost no change in body movement such as at rest. However, there is a problem in that the correction of the window cannot follow this change because the change in the pulse rate is large at the start of exercise. For example, in FIG. 10, when the horizontal axis represents the elapsed time and the vertical axis represents the pulse rate, and the time transition of the pulse rate before and after the start of exercise is shown by a polygonal line P, the pulse rate before the start of exercise (before time t1) is shown. The correction of the window follows the change of
Immediately after 1), since the pulse rate increases remarkably, the window correction cannot follow this change. Therefore, even if the measured value at this time is outside the window even if it is a normal value, it will be removed as an abnormal value, so not only will such a value not be displayed, but the level of the window will also be passed. However, it will not be corrected. Such a problem also applies to an apparatus that measures a running pitch that exhibits the same change as the pulse rate.

In view of the above problems, the object of the present invention is to
An object of the present invention is to provide a measuring device capable of responsively identifying a normal value or an abnormal value even when the pulse rate, the pitch, and the like change so much that they deviate from the window.

[0007]

In order to solve the above-mentioned problems, in the measuring device according to the present invention, the measured value which is the previous normal value among the measured values obtained from the detection signal of the sensor means or the measured value is A window setting means for setting a window for determining whether the measured value of this time is a normal value or an abnormal value based on a plurality of measured values including the measured value of this time is contained in the window set by the window setting means. Whether the present measurement value is within the window, it is determined that the measurement value is a normal value, and when it is out of the window, the measurement value is an abnormal value. Even if the measured value of this time is outside the window, the abnormal value remains above the upper limit of the window or falls below the lower limit of the window until the current measurement. Mom if it continued for a predetermined number of times,
The measurement value of this time is a normal value, the determination result correction means for correcting the determination result of the window determination means, and the measurement value of this time made a normal value by the determination of the window determination means or the correction by the determination result correction means. Is displayed on the display unit.

According to the present invention, when the measured value of this time is determined to be an abnormal value by the window determination means and the determination result is not corrected by the determination result correction means, the display control means determines It is preferable that the display unit displays that the measured value of is an abnormal value.

The measuring device according to the present invention further comprises a storage means for storing a normal value among the measured values, and the display control means is stored in the storage means based on an external operation. It is preferable that the display unit is configured to display a normal measured value that is present.

In the present invention, the storage means is configured to store an abnormal value among the measured values together with a determination result to that effect, and the display control means is stored in the storage means based on an external operation. It is preferable that the normal value and the abnormal value are displayed on the display unit.

In the present invention, the sensor means is, for example, a pulse wave detecting sensor for detecting a pulse wave,
In this case, the measurement value obtained based on the detection signal of the sensor can be used as the pulse rate.

In the present invention, the sensor means is, for example, a body movement detecting sensor for detecting body movement,
In this case, the pitch can be a measurement value obtained based on the detection signal of the sensor.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to the drawings.

(Overall Structure) FIG. 1 is an explanatory view showing the structure of a portable pulse wave measuring apparatus of this example.

In FIG. 1, a portable pulse wave measuring device 1 (pulse rate / cycle / frequency measuring device) of the present example has a device body 10 having a wristwatch structure, and a cable 20 connected to the device body 10. The pulse wave detection sensor unit 30 is provided on the distal end side of the cable 20. A connector piece 80 is formed on the tip end side of the cable 20, and the connector piece 80 is detachable from the connector section 70 formed on the 6 o'clock side of the apparatus body 10. The device body 10 is provided with a wristband 12 which is wound around the wrist from the 12 o'clock direction on the wristwatch and fixed at the 6 o'clock direction.
Thus, the device body 10 is attachable to and detachable from the arm. The pulse wave detection sensor unit 30 includes a sensor fixing band 40.
It is worn between the base of the index finger and the knuckle while being shielded from light by. As described above, when the pulse wave detection sensor unit 30 is attached to the base of the finger, the cable 20 can be short, so that the cable 20 does not interfere with running. Further, when the distribution of body temperature from the palm to the fingertip is measured, the temperature at the fingertip decreases significantly when it is cold, whereas the temperature at the base of the finger does not relatively decrease. Therefore,
If the pulse wave detecting sensor unit 30 is attached to the base of the finger, the pulse rate (state value) and the like can be accurately measured even when running outdoors on a cold day.

(Structure of the Device Main Body) FIG. 2 is a plan view showing the device main body of the portable pulse wave measuring device of this embodiment with the wristband, cable and the like removed, and FIG. 3 is a portable pulse wave measuring device. It is the side view which looked at the apparatus from the direction of 3 o'clock.

In FIG. 2, the apparatus main body 10 is provided with a resin watch case 11 (main body case), and the front surface side of the watch case 11 is used in addition to the current time and date, while running or walking. Liquid crystal display device 13 with EL backlight for displaying pulse wave information such as pitch and pulse rate
(Display device) is configured. The liquid crystal display device 13 includes a first segment display area 131 located on the upper left side of the display surface, a second segment display area 132 located on the upper right side, and a third segment display area 1 located on the lower right side.
33 and a dot display area 134 located on the lower left side are configured, and various information can be graphically displayed in the dot display area 134.

Inside the watch case 11, a change in pulse rate or the like is obtained based on the pulse wave signal (state signal) measured by the pulse wave detecting sensor unit 30 and is displayed on the liquid crystal display device 13. In addition, a control unit 5 that performs various controls and data processing is configured. Since the control unit 5 is also configured with a timing circuit, the normal time, lap time, split time and the like can be displayed on the liquid crystal display device 13.

Further, the device body 10 includes an acceleration sensor 9
The body movement sensor device 90 that detects the body movement as a body movement signal using 1 is also built in, and the control unit 5 obtains the pitch based on the body movement signal detected by the body movement sensor device 90, and Can be displayed on the liquid crystal display device 13.

Further, in the wrist-worn pulse wave measuring device 1 of this example, as will be described later, an average value is obtained from the measured values (pulse rate and pitch) including the current measurement result, and the average value is displayed on the liquid crystal display device 13. While displaying, the maximum value of the measured values including the measurement result of this time is calculated, and the maximum value is also calculated.
It is supposed to be displayed in 3. However, the maximum value and the average value of these are obtained by using only the normal value among the measured values. Further, among the measured results, the normal value is stored, and the measured value can be displayed and reproduced on the liquid crystal display device based on an external operation.

Button switches 111 to 115 for performing external operations such as time adjustment and switching of display modes are formed on the outer peripheral portion of the watch case 11. Also, on the surface of the watch case, a large button switch 1
16, 117 are configured.

The portable pulse wave measuring device 1 includes a watch case 1
1 has a small button-type battery 59 built therein, and the cable 20 supplies electric power from the battery 59 to the pulse wave detection sensor unit 30 and the detection result of the pulse wave detection sensor unit 30. Is input to the control unit 5 of the watch case 11.

In the portable pulse wave measuring apparatus 1, it is necessary to increase the size of the apparatus main body 10 as the functions thereof are increased. The main body 10 is set to a wristwatch at 6 o'clock and 12
It cannot be expanded in the direction of time. Therefore, the device body 1
For 0, a horizontally long watch case 11 whose length dimension in the 3 o'clock and 9 o'clock directions is longer than the length dimension in the 6 o'clock and 12 o'clock directions is used. However, the wristband 12
Since the wristband 12 is connected at a position biased toward the 3 o'clock side, the wristband has a large overhanging portion 101 in the 9 o'clock direction, but such a large overhanging portion is in the 3 o'clock direction. There is no. Therefore, the horizontally long watch case 11
Instead of using the watch, the wrist can be bent freely, and the back of the hand does not hit the watch case 11 even if it falls.

A battery 59 is provided inside the watch case 11.
On the other hand, in the direction of 9 o'clock, the flat piezoelectric element 5 for the buzzer
8 are arranged. Since the battery 59 is heavier than the piezoelectric element 58, the position of the center of gravity of the apparatus main body 10 is in a position deviated in the 3 o'clock direction. Since the wrist band 12 is connected to the side where the center of gravity is deviated, the device body 10 can be stably attached to the arm. In addition, the battery 59 and the piezoelectric element 5
8 and 8 are arranged in the plane direction, the apparatus main body 10 can be made thin, and the user can easily replace the battery 59 by providing the battery lid 118 on the back surface part 119 as shown in FIG. .

(Structure of Mounting Device Main Body on Arm) In FIG. 3, in the 12 o'clock direction of the watch case 11, there is a connecting portion 105 for holding the stop shaft 121 attached to the end portion of the wristband 12. Has been formed. In the 6 o'clock direction of the watch case 11, the wristband 12 wound around the arm is folded back at an intermediate position in the length direction, and a receiving portion 106 to which a fastener 122 for holding this intermediate position is attached is formed. Has been done.

In the 6 o'clock direction of the device body 10, the portion from the back surface portion 119 to the receiving portion 106 is the watch case 1.
It is molded integrally with 1 and is about 115 ° to the back surface 119.
The rotation stopping portion 108 forms an angle. That is, when the device body 10 is mounted by the wristband 12 so as to be positioned on the upper surface portion L1 (back of the hand) of the left wrist L (arm), the back surface portion 119 of the watch case 11 has the upper surface portion L1 of the wrist L. While the rotation stopper 108,
It abuts on the side face L2 having the radius R. In this state, the back surface portion 119 of the apparatus body 10 feels to straddle the radius R and the ulna U, while the bending portion 109 between the rotation stopping portion 108 and the back surface portion 119 and the rotation stopping portion 108 contact the radius R. It makes you feel like you're in touch. As described above, since the rotation stopping portion 108 and the back surface portion 119 form an anatomically ideal angle of about 115 °, even if the device body 10 is rotated in the direction of arrow A or arrow B, The device body 10 has an arm L
Do not unnecessarily shift around. Further, since the back surface part 119 and the rotation stopping part 108 only restrict the rotation of the apparatus main body 10 at two positions on one side around the arm, the back surface part 119 and the rotation stopping part 108 can be surely secured even if the arm is thin. Since it comes into contact with, you can surely obtain the anti-rotation effect, but you do not feel cramped even if your arm is thick.

(Structure of Sensor Unit for Pulse Wave Detection) FIG. 4
FIG. 4 is a cross-sectional view of a pulse wave detection sensor unit of this example.

In FIG. 4, the pulse wave detecting sensor unit 30 has a component housing space 300 formed therein by covering a back side of a sensor frame 36 as a case body with a back cover 302. A circuit board 35 is arranged inside the component storage space 300. The LED 31, the phototransistor 32, and other electronic components are mounted on the circuit board 35. Pulse wave detection sensor unit 3
At 0, the end of the cable 20 is fixed by a bush 393, and each wiring of the cable 20 is soldered on the pattern of each circuit board 35. Here, the pulse wave detection sensor unit 30 is attached to the finger so that the cable 20 is pulled out from the base side of the finger to the apparatus main body 10 side. Therefore, the LED 31 and the phototransistor 32 are arranged along the length direction of the finger, of which the LED 31 is located on the tip side of the finger and the phototransistor 32 is located on the base of the finger. Such an arrangement has an effect that external light does not easily reach the phototransistor 32.

In the pulse wave detecting sensor unit 30, a light transmitting window is formed on the upper surface of the sensor frame 36 by a light transmitting plate 34 made of a glass plate.
The ED 31 and the phototransistor 32 have their light emitting surface and light receiving surface facing the light transmitting plate 34, respectively. Therefore, when the finger surface is brought into close contact with the outer surface 341 of the transparent plate 34, the LED 31 emits light toward the finger surface side, and the phototransistor 32 causes the light emitted from the LED 31 from the finger side. The reflected light can be received.
Here, the outer surface 341 of the translucent plate 34 has a structure protruding from the peripheral portion 361 for the purpose of enhancing the adhesiveness with the finger surface.

In this example, as the LED 31, InGaN is used.
System (indium-gallium-nitrogen system) blue LED is used, and its emission spectrum has an emission peak at 450 nm, and its emission wavelength range is from 350 nm to 60 nm.
It is in the range up to 0 nm. LE having such emission characteristics
Corresponding to D31, in this example, the phototransistor 3
2, a GaAsP-based (gallium-arsenic-phosphorus-based) phototransistor is used, and the light receiving wavelength region of the device itself has a main sensitivity region of 300 nm to 600 nm.
Up to 300 nm and there is a sensitivity region below 300 nm.

The pulse wave detecting sensor unit 30 thus constructed is attached to the base of the finger by the sensor fixing band 40. In this state, when the LED 31 emits light toward the finger, the light is emitted to the blood vessel. When hemoglobin arrives and hemoglobin in the blood absorbs a part of the light and reflects it. The light reflected from the finger (blood vessel) is phototransistor 3
The light is received by 2, and the change in the amount of received light corresponds to the change in blood volume (pulse wave of blood). That is, when blood volume is high,
While the reflected light becomes weaker and the reflected light becomes stronger as the blood volume decreases, the pulse rate and the like can be measured from the detection result of if the change in the reflected light intensity is optically detected as a pulse wave signal.

In this example, the LED 31 whose emission wavelength range is in the range of 350 nm to 600 nm and the phototransistor 32 whose reception wavelength range is in the range of 300 nm to 600 nm are used. The biological information is displayed based on the detection result in the wavelength region up to approximately 600 nm, that is, in the wavelength region of approximately 700 nm or less. By using the pulse wave detecting sensor unit 30, even when external light hits the exposed part of the finger, light having a wavelength region of 700 nm or less among the light included in the external light uses the finger as a light guide and the phototransistor 32 (received light). Part) is not reached. The reason is that light having a wavelength range of 700 nm or less included in external light tends not to easily pass through a finger. Therefore, even if external light is applied to a part of the finger not covered with the sensor fixing band 40, This is because it cannot reach the phototransistor 32 through the finger. In contrast,
When an LED having an emission peak near 880 nm and a silicon-based phototransistor are used, the light receiving wavelength range thereof extends from 350 nm to 1200 nm. In this case, since the pulse wave is detected based on the detection result of the light having a wavelength of 1 μm that can easily reach the light receiving portion by using the finger as a light guide, it is caused by the fluctuation of the external light. False positives are likely to occur.

Further, since the pulse wave information is obtained by using the light in the wavelength region of about 700 nm or less, the S / N ratio of the pulse wave signal based on the blood volume change is high. The reason for this is that hemoglobin in blood has an extinction coefficient for light with a wavelength of 300 nm to 700 nm at a wavelength of 8 which is conventional detection light.
Several times to about 100 times the absorption coefficient for 80 nm light
Because it is more than twice as large, it changes sensitively to blood volume changes,
It is considered that the detection rate (S / N ratio) of the pulse wave based on the blood volume change is high.

(Structure of Control Unit) FIG. 5 shows the structure of each sensor and the control unit 5. In the pulse wave detection sensor unit 30, the light emitted from the LED 31 is irradiated into the living body and reflected. The light is modulated according to the change in the volume of the blood vessel, and the light change is converted into a change in current by the phototransistor 32, and then a voltage output (pulse wave signal) is obtained by the collector resistance. In the subsequent stage of the pulse wave detection sensor unit 30, an AC amplifier, a low pass filter,
A pulse wave signal amplification circuit 511 including a Schmitt trigger comparator for converting into a rectangular wave is configured, and a pulse wave period measurement counter 512 is configured at a subsequent stage of this amplification circuit. The pulse wave period measurement counter 512 counts the time between the edges of the rectangular wave output from the pulse wave signal amplification circuit 511 using the reference clock 550 as a time standard, and outputs the counter value K to the CPU 55. .

Further, in this example, a body movement sensor device 90 is also provided, and the body movement sensor device 90 is composed of an acceleration sensor 91 serving as a body movement sensor, a discharge resistor, and a preamplifier formed of an FET. There is. A body movement signal amplification circuit 521 including an AC amplifier, a low-pass filter, and a Schmitt trigger comparator for converting into a rectangular wave is configured in the latter stage of the body movement sensor device 90, and the body movement cycle measurement is performed in the latter stage of this amplification circuit. The counter 522 is configured. The body movement cycle measurement counter 522 also counts the time between the edges of the output rectangular wave from the body movement signal amplification circuit 521 using the reference clock 550 as a time standard, and outputs the counter value T to the CPU 55. .

The CPU 55 also uses the reference clock 550.
Is used as a basic clock, and while the RAM 502 is used for arithmetic storage, arithmetic processing is performed based on the program stored in the ROM 501, and the arithmetic result (pulse rate) is displayed on the liquid crystal display device 13. ing.

(Window judgment of pulse wave data processing section) CP
The function of the pulse wave data processing unit of U55 is shown in the block diagram of FIG.
Pulse rate calculator 5 that calculates the pulse rate from the current detection result
51 and the previous measurement value determined to be a normal value out of the pulse rate calculated by the pulse rate calculation unit 551 as a reference value, and
A window setting unit 554 that sets a window for a pulse rate defined by an upper limit width and a lower limit width with respect to this reference value.
Then, in the determination result of the window determination unit 552 (window determination unit) that determines whether or not the pulse rate measured this time is included in this window, and the determination result of the window determination unit 552,
When the measured value this time is within the window, a display control unit 500 (display control means) for displaying the measured value as a normal value on the liquid crystal display device 13 in real time is configured.

Further, the CPU 55 is provided with a window judging section 5
In the determination result of 52, if the abnormal value continues three times until the current measurement even if the current measurement value is outside the window,
A determination result correction unit 553 is configured to correct the determination result of the window determination unit 552 that the measured value this time is a normal value. That is, from the window set based on the previous normal value, it is unnatural that the abnormal value continues three times due to the influence of noise even if the measured value this time is outside the window. Since the exercise started from, the pulse rate actually changed greatly, so it was only out of the window, and the measured value this time has a higher probability of being a normal value.

Therefore, the display control unit 500 determines that the current measurement value is not only in the determination result of the window determination unit 552 when the current measurement value is within the window, but also in the determination result of the determination result correction unit 553. Even if it is outside the window, the abnormal value continues three times until this measurement, so even if the determination result of the window determination unit 552 is corrected that the current measurement value is a normal value, this measurement value is displayed on the LCD. Display device 1
3 is displayed in real time.

However, the display control unit 500 determines that the current measurement value is an abnormal value because the current measurement value is outside the window in the determination result of the window determination unit 552, and the determination result correction unit 553 determines that the current measurement value is an abnormal value. If the abnormal value has been continued only once or twice until this time in the result of re-determination, the measured value of this time is regarded as an abnormal value, and a bar display "---" is displayed as a display to that effect. Has become.

The determination result correction unit 553 corrects the determination result of the window determination unit 552 when any of the three measured values exceeds the upper limit value of the window or when the measured values of the three times. Only if Momo is below the lower limit of the window. That is, even if the abnormal value continues three times,
Even if an abnormal value exceeding the upper limit value of the window and an abnormal value lower than the lower limit value of the window appear alternately, the determination result correction unit 553 is configured not to correct the determination result of the window determination unit 552. ing. Therefore, also in this case, the display control unit 500 determines that the current measured value is an abnormal value,
A bar display "---" to that effect is provided. This is because if the determination result of the window determination unit 552 is corrected in such a case, the measurement accuracy will be greatly sacrificed.

The pulse rate measurement value determined to be a normal value by the window determination unit 552 or the determination result correction unit 553 is stored in the RAM 502, and an instruction to that effect is given by an external operation. When there was,
The display control unit 500 displays these measured values in the liquid crystal display device 1.
It can be reproduced in 3.

Further, the pulse wave data processing unit has a RAM 5
The average value is calculated from the normal value measured this time stored in 02 and the normal value measured before that, and the average value is R
Average value calculation unit 555 to be stored in AM502, and RAM
Find the maximum value of the normal value measured this time and the normal value measured before that stored in 502,
Maximum / minimum value calculation unit 5 for storing it in the RAM 502
And 56 are configured. Here, in the case of pulse rate,
Usually, we are interested in the maximum value, so the maximum / minimum value calculator 5
56 determines only the maximum value of the pulse rate. The display control unit 500 can display the average value and the maximum value calculated by the average value calculation unit 555 and the maximum / minimum value calculation unit 556 on the liquid crystal display device 13 in real time, and the RAM 502 based on an external operation. It is also possible to display the average value and the maximum value stored in the LCD after the liquid crystal display device 13.

(Window determination of body motion data processing unit) FIG. 7
As shown in the block diagram, the body movement data processing unit included in the control unit 5 includes a pitch calculation unit 561 that calculates a pitch from the current detection result of the body movement detection sensor device 90.
And a window setting for setting a window for a pitch defined by an upper limit width and a lower limit width with respect to a reference value to a previous measurement value determined to be a normal value among the pitches calculated by the pitch calculator 561. Part 564,
A window determination unit 562 (window determination means) for determining whether or not the pitch measured this time is included in this window is configured. Here, the display control unit 500
When the current measurement value is within the window according to the determination result of the window determination unit 562, is displayed on the liquid crystal display device 13 as a normal value in real time.

Further, the CPU 55 is provided with a window judging section 5
In the judgment result of 62, if the abnormal value continues three times until the current measurement even if the current measurement value is outside the window,
A determination result correction unit 563 is configured to correct the determination result of the window determination unit 562 that the measured value this time is a normal value. In other words, from the window set based on the previous normal value, it is unnatural that the abnormal value continues three times due to the influence of noise even if the measured value this time is outside the window, for example during a marathon. This is because the pitch was actually changed significantly and it was only out of the window, and the measured value this time has a higher probability of being a normal value.

Therefore, the display control unit 500 determines that the current measurement value is not only in the determination result of the window determination unit 562 when the current measurement value is within the window, but also in the re-determination result of the determination result correction unit 563. Even if it is outside the window, the abnormal value continues three times until the current measurement. Therefore, even if the determination result of the window determination unit 562 is corrected so that the current measurement value is a normal value, this measurement value is displayed on the LCD. Display device 1
3 is displayed in real time.

However, the display control unit 500 determines that the current measurement value is an abnormal value because the current measurement value is outside the window in the determination result of the window determination unit 562.
In addition, when the result of re-determination by the determination result correction unit 563 shows that the abnormal value has continued only once or twice until this time, the measured value of this time is regarded as an abnormal value, and a bar is displayed as a display to that effect. It is configured to perform "---".

The determination result correction unit 563 corrects the determination result of the window determination unit 562 when any of the measured values of three times exceeds the upper limit value of the window, or any of the measured values of three times. Only if Momo is below the lower limit of the window. That is, even if the abnormal value continues three times,
The determination result correction unit 563 is configured not to correct the determination result of the window determination unit 562 even when an abnormal value exceeding the upper limit value of the window and an abnormal value lower than the lower limit value of the window appear alternately. ing. Therefore, also in this case, the display control unit 500 determines that the current measured value is an abnormal value,
A bar display "---" to that effect is provided. This is because if the determination result of the window determination unit 562 is corrected in such a case, the measurement accuracy will be greatly sacrificed.

Further, the body movement data processing unit has a RAM 5
The average value is calculated from the normal value measured this time stored in 02 and the normal value measured before that, and the average value is R
An average value calculation unit 565 stored in the AM 502, and a RAM
Find the maximum value of the normal value measured this time and the normal value measured before that stored in 502,
Maximum / minimum value calculation unit 5 for storing it in the RAM 502
66 are configured. Here, unlike the case of the pulse rate, in the case of the pitch, since the maximum value and the minimum value are of interest, the maximum / minimum value calculation unit 566 obtains both the maximum value and the minimum value of the pitch. It is like this.
In addition, the display control unit 500 includes the average value and the maximum value calculated by the average value calculation unit 565 and the maximum / minimum value calculation unit 566.
The minimum value can be displayed on the liquid crystal display device 13 in real time, and the average value and the maximum / minimum value stored in the RAM 502 can be displayed on the liquid crystal display device unit 13 later based on an external operation. is there.

(Processing of window judgment and correction) ROM
501 includes a pulse rate calculator 551 and a pitch calculator 56.
1, window setting unit 554, 564, window determination unit 5
52, 562 and programs corresponding to the determination result correction units 553, 563 are stored, and the control flow thereof will be described below. However, the pulse wave detection sensor unit 3
Basically, the same processing as obtaining the pulse rate from the detection signal of 0 and determining the window, and obtaining the pitch from the detection signal of the body movement detecting sensor device 90 and determining the window Is. Therefore, the control flow of only the process for the pulse wave number is shown in FIG. 8 and will be described below.
Illustration and description are omitted.

First, in step ST1, the pulse wave period measuring counter 512 obtains a counter value K from the detected pulse wave signal, and the processing is started.

In step ST2, first, from the counter value K obtained by the pulse wave period measurement counter 512, the current pulse rate M
ask for cu. Such processing corresponds to the processing performed by the pulse rate calculator 551.

Next, in step ST3, the current pulse rate M
cu is compared with a value obtained by adding 20 beats / minute to the previous pulse rate Mbe. This process corresponds to the process of the window determination unit 552. In this example, the range is ± 20 beats / minute with respect to the previously measured value (pulse rate) that is regarded as the normal value, and this is for setting the upper limit. This process corresponds to the process performed by the window setting unit 554.

As a result, if the current pulse rate Mcu is smaller than the value obtained by adding 20 beats / minute to the previous pulse rate Mbe, the current pulse rate Mcu is likely to be a normal value, In ST4, the current pulse rate Mcu is compared with the value obtained by subtracting 20 beats / minute from the previous pulse rate Mbe. In the present example, the range is ± 20 beats / minute with respect to the measured value (pulse rate) that was the normal value last time, and the window is set, so that the lower limit thereof is set.

As a result, when the current pulse rate Mcu is larger than the value obtained by subtracting 20 beats / minute from the previous pulse rate Mbe, the current pulse rate Mcu is within the window in the window determination. Can be determined. That is, as a result of the window determination, the current pulse rate Mcu is determined to be a normal value.

Therefore, the current pulse rate Mcu is set to a normal value, and the processes from step ST5 to step ST9 are performed. That is, in step ST5, the current pulse rate Mcu is substituted for the previous pulse rate Mbe, and then, in step ST6, the upper limit abnormality counter Ymax is set to 0 and the lower limit abnormality counter Ymin is set to 0. Next, in step ST7, while displaying the current pulse rate Mcu,
It is stored in the RAM 502. Of these processes, the display process corresponds to the process performed by the display control unit 500. Thereafter, in step ST8, the total average Mave is obtained from the measured values of all pulse rates that have been determined to be normal values, including the current pulse rate Mcu, and is stored in the RAM 502. These processes correspond to the process performed by the average value calculator 555. Further, in step ST9, the maximum value Mmax is obtained from the measured values of all pulse rates which have been determined to be normal values including the current pulse rate Mcu, and the RAM 50
Store in 2. These processes are performed by the maximum / minimum value calculation unit 5
This corresponds to the process of 56. Then, step ST1
At 0, the processing for one measurement value ends.

On the other hand, in step ST3, as a result of comparison between the current pulse rate Mcu and the value obtained by adding 20 beats / minute to the previous pulse rate Mbe, the current pulse rate Mcu is the previous pulse rate Mbe. If it is larger than the value obtained by adding 20 beats / minute to, the upper limit abnormality counter Ymax is 2 in step ST11.
Or not. As a result, if the upper limit abnormality counter Ymax is not 2, the value of the upper limit abnormality counter Ymax is incremented by 1 in step ST12, and
The lower limit abnormality counter Ymin is set to 0. Then, in step ST13, an error display is displayed by the bar display "---", and the process for the current measured value is ended. Therefore,
Initialization of the upper limit abnormality counter Ymax and the lower limit abnormality counter Ymin performed in step ST6, display / data storage of the current pulse rate Mcu performed in step ST7, calculation / data storage of total average Mave performed in step ST8,
And calculation of the maximum value Mmax performed in step ST9
No data storage is done. Therefore, since the average value and the maximum value based on the data including the abnormal value are not calculated, the displayed contents are accurate and the load associated with useless processing can be reduced.

These steps ST11 to S
In the process up to T13, in step ST3, as a result of comparing the current pulse rate Mcu and the value obtained by adding 20 beats / minute to the previous pulse rate Mbe, the current pulse rate Mcu is 20 times the previous pulse rate Mbe. If it is larger than the value obtained by adding the beats / minutes, the upper limit abnormality counter Ymax is set to 2 in step ST11.
Until it is determined that

If it is determined in step ST11 that the upper limit abnormality counter Ymax is 2, step S11 is performed.
The processing from T5 to step ST10 is performed. That is, in steps ST3 and ST4, the same processing as when the current measurement value is determined to be a normal value is performed. That is, even if the current measurement value is outside the window, an abnormal value that exceeds the upper limit of the window has continued three times before the current measurement, so the window determination result indicates that the current measurement value is a normal value. to correct. Such processing corresponds to the processing performed by the determination result correction unit 563.

On the other hand, in step ST3, the current pulse rate M
As a result of comparing cu with the value obtained by adding 20 beats / minute to the previous pulse rate Mbe, it is determined that the current pulse rate Mcu is smaller than the value obtained by adding 20 beats / minute to the previous pulse rate Mbe. Also,
In step ST4, as a result of comparison between the current pulse rate Mcu and the value obtained by subtracting 20 beats / minute from the previous pulse rate Mbe, the current pulse rate Mcu subtracted 20 beats / minute from the previous pulse rate Mbe. When it is determined that the value is smaller than the value, it is determined in step ST14 whether the lower limit abnormality counter Ymin is 2. As a result, if the lower limit abnormality counter Ymin is not 2, the value of the lower limit abnormality counter Ymin is incremented by 1 and the upper limit abnormality counter Ymax is set to 0 in step ST15. Then, step ST16
Then, the error display is displayed by the bar display "---", and the process for the current measured value is ended.

These steps ST14 to S
As for the processing up to T16, in step ST3, as a result of comparing the current pulse rate Mcu and the value obtained by adding 20 beats / minute to the previous pulse rate Mbe, the current pulse rate Mcu is 20 times the previous pulse rate Mbe. It is determined that the pulse rate is smaller than the value obtained by adding beats / minutes, and in step ST4, the current pulse rate Mcu is compared with the value obtained by subtracting 20 beats / minute from the previous pulse rate Mbe. The number Mcu is 20 from the previous pulse rate Mbe
If it is determined that it is smaller than the value obtained by subtracting the beats / minute, the lower limit abnormality counter Ymin is set to 2 in step ST14.
Until it is determined that Therefore, step S
Initialization of upper limit abnormality counter Ymax and lower limit abnormality counter Ymin performed at T6, display / data storage of current pulse rate Mcu performed at step ST7, calculation / data storage of total average Mave performed at step ST8, and step ST9 Neither the calculation of the maximum value Mmax nor the data storage that is performed in step 2 is performed.

When it is determined in step ST14 that the lower limit abnormality counter Ymin is 2, step S14
The processing from T5 to step ST10 is performed. That is, in steps ST3 and ST4, the same processing as when the current measurement value is determined to be a normal value is performed. That is, even if the current measurement value is outside the window, an abnormal value below the lower limit of the window has continued three times until the current measurement, so the window determination result indicates that the current measurement value is a normal value. to correct. Such processing corresponds to the processing performed by the determination result correction unit 563.

In the present example, similar processing is also performed for the pitch measurement result, but the content of such processing is basically the same as in the flowchart shown in FIG. Since the determination and the correction to the determination result may be performed, the description thereof will be omitted.

(Main Effects of the Embodiment) As described above, in the wrist-worn pulse wave measuring device 1 according to the present embodiment, the pulse rate Mcu measured this time is entered in the window W in the window determining section 552. The window is determined whether it is a normal value or an abnormal value depending on whether the window is present or not, and the window is reset based on the normal value. Therefore, in the measurement result shown in FIG. 9, the window shifts every time the measurement value changes within the window W like the measurement values M1 and M2 of the pulse rate. Therefore, the measured value M of the pulse rate deviating from the window W
Even if abnormal values due to noise appear, such as 3 and M4, these measured values are discarded and are not displayed or stored until the normal measured value M5 appears.

However, in this example, even if the current pulse rate Mcu is determined to be an abnormal value in the window determination result,
The determination result correction unit 553 corrects the window determination result that the current measured value is a normal value when such an abnormal value continues for three times, for example. Therefore, in the measurement results shown in FIG. 9, pulse rate measurement values M6 and M deviated from the window W
When an abnormal value due to noise appears twice, as in No. 7, these measured values are discarded as they are, but even if a measured value deviating from the same window W appears, the pulse that appears the third time Since the measured value M8 of the number is determined to be a normal value, only the measured values M6 and M7 deviating from the window W are displayed as an error, and the measured value M8 is displayed on the liquid crystal display device 1.
It is displayed in 3. Therefore, even if the pulse rate changes so much that it deviates from the window W, it is possible to determine with good response whether it is a normal value or an abnormal value. Further, since the window W is reset based on the measured value M8, the normal measured value M9 of the pulse rate thereafter is determined to be outside the window W according to the window W set based on the measured value M5. Although it is often regarded as an abnormal value, it is correctly determined and displayed as a normal value.

(Another Example) In this example, of the measured values,
Only the measured value determined to be a normal value is stored in the RAM 502, but the abnormal value is also recorded in the RA
It may be stored in the M502. With this configuration,
After the measurement is completed, all the measured values stored in the RAM 502 can be reproduced, and it can be confirmed again whether each measured value was an abnormal value or a normal value.

In this example, the window determination result is corrected when the abnormal value continues for three times, but the number of times is determined to be an optimum condition according to the performance required of the measuring device. However, the values are not limited to the values in this example.

Similarly, in this example, of the pulse rate obtained from the detection signal of the pulse wave detecting sensor unit 30, the range of ± 20 beats / minute is set as the window based on the measured value which is the normal value last time. However, the upper limit width and the lower limit width are of a nature that should be set to optimum conditions according to the performance required of the measuring device and the like, and are not limited to the values of this example.

In this example, the pulse wave detecting sensor unit 30 is used.
Although the window was set based on the measured value that was considered to be the normal value last time among the pulse rate obtained from the detection signal of, the measured value that was determined to be the normal value this time and the measured value that was determined to be the normal value before that The window may be set based on the plurality of measured values.

Although the pulse rate is set in this example, if the measured value and the window have the same dimension, the window may be determined at the counter value T before the calculation.

In this example, in measuring the pulse rate, the time between the edges of the rectangular wave output from the pulse wave signal amplifying circuit 511 was counted and the pulse rate was obtained from the count value. After the analog signal output from the wave detection sensor unit 30 is amplified by the operational amplifier, it is output to the A / D converter via the sample hold circuit, and frequency analysis is performed on the pulse wave data converted into a digital signal by the A / D converter. Fast Fourier transform (FFT processing) may be performed and the pulse rate may be measured from the spectrum. Further, also in measuring and monitoring the pitch, instead of counting the time between the edges of the rectangular wave output from the body movement signal amplification circuit 521, after amplifying the analog signal output from the body movement sensor device 90 with an operational amplifier. , Outputs to the A / D converter via the sample hold circuit, performs fast Fourier transform (FFT processing) as frequency analysis on the pulse wave data converted to digital signal by the A / D converter, and measures the pitch from the spectrum. You may.

[0072]

As described above, in the measuring device according to the present invention, it is possible to determine whether the measurement value of this time is a normal value or an abnormal value, and even when the measurement value of this time is determined to be an abnormal value, If such an abnormal value continues for three times, for example, the present measurement value is a normal value, and the window determination result is corrected. Therefore, according to the present invention, it is possible to determine that the measured value is normal even if the measured value is outside the window. It can be judged and displayed with responsiveness.

Of the measured values, not only the normal value but also the abnormal value is stored together with the determination result, and when all the stored measured values can be reproduced, each measured value is There is an advantage that it is possible to confirm again whether it was an abnormal value or a normal value.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of an arm-mounted pulse wave measuring device according to an embodiment of the present invention and a usage state.

FIG. 2 is a plan view of a device body of the wrist-worn pulse wave measuring device shown in FIG.

FIG. 3 is an explanatory view of the wristwatch-type pulse wave measuring device shown in FIG. 1 when viewed from the wristwatch at 3 o'clock.

FIG. 4 is a cross-sectional view of a sensor unit used in the wrist-worn pulse wave measuring device shown in FIG.

5 is an explanatory diagram showing a configuration of a sensor and a control unit of the arm-mounted pulse wave measuring device shown in FIG.

6 is a block diagram for explaining a function of data processing for a measured value of a pulse rate in the CPU used in the control unit shown in FIG.

7 is a block diagram for explaining a function of data processing for a pitch measurement value in the CPU used in the control unit shown in FIG.

8 is a flow chart for explaining a process for window determination with respect to a pulse rate and a correction for the determination result, which is performed by the wrist-worn pulse wave measuring device shown in FIG.

9 is an explanatory diagram showing the contents of processing for window determination with respect to the pulse rate and correction for the determination result, which is performed by the wrist-worn pulse wave measuring device shown in FIG.

FIG. 10 is an explanatory diagram for explaining a problem of the conventional window correction method.

[Explanation of symbols]

1. Arm-worn pulse wave measuring device 5 ... Control unit 10 ... Device body 13 ... Liquid crystal display device (display unit) 30 ... Pulse wave detection sensor unit (sensor means) 31 ... LED 32 ... Phototransistor 55 ... CPU 90 ... Body motion sensor device (sensor means) 501 ... ROM 502 ... RAM (storage means) 511 ... Pulse wave signal amplification circuit 512 ... Pulse wave cycle measurement counter 521 ... Body movement signal amplification circuit 522 ... Body movement cycle measurement counter 500 ... Display control unit 551 ... Pulse rate calculator 552, 562 ... Window determination unit 553, 563 ... Judgment result correction unit 554, 564 ... Window setting unit 555, 565 ... Average value calculator 556, 566 ... Maximum / minimum calculation unit 561 ... Pitch calculator

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-61-244327 (JP, A) JP-A-4-71532 (JP, A) JP-A-9-154825 (JP, A) 3927 (JP, U) JP-B-63-34731 (JP, B1) Jpn. 3-49686 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01D 1/18 A61B 5 / 0245 G04G 1/00 315

Claims (6)

(57) [Claims] 1. A method for determining whether a current measurement value is a normal value or an abnormal value on the basis of a measurement value which is a previous normal value or a plurality of measurement values including the measurement value obtained from a detection signal of a sensor means. The window setting means for setting the window for determination and the window set by the window setting means are checked to see if the current measurement value is present. If the current measurement value is within the window, the measurement is performed. The value is determined to be a normal value, and when the measured value is out of the window, the measured value is an abnormal value, and the measured value of the measured value is outside the window in the determination result of the measured value. However, if the abnormal value continues for a predetermined number of times until the current measurement until it exceeds the upper limit of the window or falls below the lower limit of the window, it is determined that the measured value of this time is a normal value. Determination result correcting means for correcting the determination result of the window determination means, and display control means for displaying the measured value of this time which is a normal value by the determination of the window determination means or the correction by the determination result correction means on the display section. And a measuring device. 2. The display control means according to claim 1, wherein the current measurement value is determined to be an abnormal value by the window determination means, and the determination result is not corrected by the determination result correction means. Is configured to display on the display unit that the current measured value is an abnormal value. 3. The storage device according to claim 1, further comprising a storage unit that stores a normal value among the measured values,
The display control unit is configured to display a normal value stored in the storage unit on the display unit based on an external operation. 4. The storage unit according to claim 3, wherein the storage unit is configured to store an abnormal value among the measured values together with a determination result to that effect, and the display control unit stores the storage unit based on an external operation. A measuring device configured to display a normal value and an abnormal value stored in the means on the display unit. 5. The sensor device according to claim 1, wherein the sensor means is a pulse wave detection sensor for detecting a pulse wave, and a measured value obtained based on a detection signal of the sensor is , A pulse rate measuring device. 6. The sensor device according to claim 1, wherein the sensor means is a body movement detecting sensor for detecting body movement, and a measured value obtained based on a detection signal of the sensor is , A pitch, a measuring device.