JPH0686702U - Portable pulse rate detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pulse rate detection device capable of obtaining a high measurement accuracy even during exercise and a value accurately corresponding to an exercise load. [Structure] Pressure sensor 36 pressed against radial artery of living body
By its pressure pulse wave produced from the radial artery is detected, pulse rate P _d per unit time from the pressure pulse wave is calculated by measuring the display unit 10 corresponding to the pulse rate calculating means, is the pulse rate P _d Audio is output from the audio output unit 12. Since the pressure sensor 36 is pressed against the radial artery of the living body, the pressure pulse wave generated from the radial artery is stably detected regardless of the vibration due to the motion, so that the measurement accuracy is improved. Further, since the calculated pulse rate P _d is output by voice from the voice output unit 12, it is possible to check one's pulse rate during exercise without pausing the exercise or slowing the exercise motion. The pulse rate corresponding to the exercise load at that time can be accurately obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a portable pulse rate detection device that detects the pulse rate of a living body.

[0002]

[Prior art]

 There is a portable pulse rate detection device as a kind of pulse rate detection device for detecting the pulse rate that is the cardiovascular information of the living body. Since the pulse rate of the living body is a value related to the exercise load, this type of portable pulse rate detection device is used to sequentially detect the load of the living body during exercise.

By the way, the conventional portable pulse rate detecting device usually irradiates red light or infrared light with a light emitting diode in contact with a living body, and transmits transmitted light or reflected light obtained from the inside of the living body. The pulse rate is calculated based on the periodical change signal of the transmitted light or reflected light, that is, the photoelectric pulse wave signal, and the pulse rate is displayed on a display that can display numbers. Configured to display. Alternatively, a second electrode is provided on a part of the display surface of the wristwatch-type body attached to one wrist so as to function as the first electrode, and the other electrode is brought into contact with the second electrode. The electrocardiographic signal is detected, the pulse rate is calculated based on the electrocardiographic signal, and the pulse rate is displayed on the display on the display surface.

[0004]

[Problems to be solved by the device]

 However, if such a conventional portable pulse rate detector is used to measure the pulse rate of a living body during exercise, vibrations impair the close contact of the light emitting diode and the optical sensor with the skin, and thus the photoelectric pulse wave signal is There was a drawback that it became unstable and the measurement accuracy was low. Alternatively, when trying to measure one's pulse rate during exercise, the other electrode must be brought into contact with the second electrode provided on the display surface of the main body attached to one wrist, Since the exercise had to be temporarily stopped or the exercise action had to be moderated, the exercise load temporarily decreased, and the pulse rate corresponding to the exercise load at that time could not be accurately obtained.

The present invention has been made in view of the above circumstances, and an object of the present invention is to detect a pulse rate that can obtain a high measurement accuracy even during exercise and a value that accurately corresponds to an exercise load. To provide a device.

[0006]

[Means for Solving the Problems]

 The gist of the present invention for achieving the above-mentioned object is a device that is attached to a part of a living body and detects the pulse rate of the living body. A pressure sensor that detects the pressure pulse wave generated from the artery when it is pressed, and (b) a pulse rate calculation means that calculates the pulse rate per unit time from the pressure pulse wave detected by the pressure sensor, ) An audio output device for outputting the pulse rate calculated by the pulse rate calculating means or its change by voice.

[0007]

[Action]

 By doing this, the pressure pulse wave generated from the artery is detected by the pressure sensor pressed to a part of the living body's artery, and the pulse rate per unit time is calculated from the pressure pulse wave by the pulse rate calculation means. , Its pulse rate or its change is output by a voice output device.

[0008]

[Effect of device]

 Therefore, according to the pulse rate detection device of the present invention, since the pressure sensor is pressed against the artery of the living body, the pressure pulse wave generated from the artery is stably detected regardless of the vibration due to the motion. , The measurement accuracy is improved. In addition, since the calculated pulse rate is output by voice from the audio output device, you can check your pulse rate during exercise without pausing exercise or slowing your movements. The pulse rate corresponding to the exercise load of is accurately obtained.

[0009]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings.

1 and 2 are perspective views showing an example of a pulse rate detecting apparatus to which the present invention is applied. FIG. 1 shows a measurement display unit 10 worn on the wrist, and FIG. Part 12 is shown.

The measurement display unit 10 shown in FIG. 1 includes a main body case 20 having a liquid crystal display plate 14, a mode change push button switch 16 and a setting push button switch 18, and a pin 22 at one end of the main body case 20 to allow rotation. The arc-shaped first link member 24 connected thereto, the arc-shaped second link member 28 rotatably connected to the other end of the main body case 20 by the pin 26, the first link member 24 and the second link member A first belt connecting fitting 30 and a second belt connecting fitting 32, which are rotatably connected to open end portions of 28, respectively, and detachably fixed between the first belt connecting fitting 30 and the second belt connecting fitting 32. And a flexible belt 34 that is formed into a ring shape.

Further, a base end portion of a leaf spring 38 having a pressure sensor 36 at its tip portion is rotatably connected to one end of the main body case 20 by the pin 22. The pressure sensor 36 includes, for example, five pressure detection elements 40 _{a to} 40 _e, for example, 0. The pressing surface 42 is arranged in the circumferential direction at intervals of about 5 mm, and is supported by the tip of the leaf spring 38 so as to be rotatable around the pin 44. This pressure sensor 36 is formed on a semiconductor substrate, like the one disclosed in Japanese Patent Laid-Open No. 3-207340. Further, a longitudinal accommodation groove 46 is formed on the inner peripheral surface of the first link member 24, and when the annular measurement display portion 10 is mounted on the wrist and the belt 34 is tightened, the pressure sensor is used. 36 and the leaf spring 38 supporting it are housed in the housing groove 46 so that interference with the first link member 24 does not occur.

Further, when the measurement display unit 10 is attached to the wrist of the subject and the belt 34 is tightened, the pressing surface 42 of the pressure sensor 36 is pressed against the radial artery so that the length of the leaf spring 38 increases. The shape and curved shape have been determined. The pins 22, 26 and 44 are mounted so as to be parallel to each other.

The audio output unit 12 shown in FIG. 2 is composed of a small-diameter portion 50 inserted into the ear canal and a large-diameter portion 52 following the small-diameter portion 50 to be attached to the ear of the person to be measured. As shown in, a circuit for receiving a signal transmitted from the measurement display unit 10 and generating a sound is provided.

FIG. 3 is a diagram illustrating a measurement display circuit and a voice output circuit provided in the measurement display unit 10 and the voice output unit 12, respectively. In the measurement display unit 10 and the voice output unit 12 shown in the figure, a power supply circuit for supplying drive power from a battery to each circuit element is omitted.

In FIG. 3, the pressure pulse wave signal detected by the pressure sensor 36 is amplified by the amplifier 58, converted into a digital signal by the A / D converter 60, and then supplied to the CPU 62. The CPU 62 constitutes a so-called micro computer together with the RAM 64, the ROM 66, the input interface circuit 68, and the output interface circuit 70. The CPU 62 uses the temporary storage function of the RAM 64 and outputs an input signal in accordance with a program stored in advance in the ROM 66. The processed pulse rate P _d is displayed on the liquid crystal display panel 14 via the display interface circuit 72 and is output to the voice synthesis circuit 74 via the output interface circuit 70. The voice synthesizing circuit 74 transmits a voice signal representing the voice by synthesizing the pulse rate P _d via the transmitting circuit 76. The receiving circuit 78 in the audio output unit 12 receives the signal transmitted from the transmitting circuit 76 and reproduces it as an audio signal, and the amplifying circuit 80 causes the micro speaker 82 to output audio based on the audio signal.

FIG. 4 is a flow chart for explaining a main part of the pulse rate measuring operation of the microcomputer, which is repeatedly executed at a constant cycle of several milliseconds or tens of milliseconds. At step SS1 in FIG optimum pressure pulse wave signal with the noise is removed from five of the pressure detection element 40 _a to 40 _e or et PPW signals respectively output is selected, it is read. FIG. 5 is a read routine showing the operation in detail. In step ST1, the pressure pulse wave signals S _{a to} S _e output from the five pressure detection elements 40 are input, and in step ST2, the values of these signals S _{a to} S _e (instantaneous pressure values). The average value A of is calculated. In the following step ST3, after the average value A is subtracted from the value of each pressure pulse wave signal, in step ST4, the maximum value of the subtracted values is the pulse rate P _d. Is taken as the value to calculate and is read. Usually, the signal from the pressure detecting element located on the center of the radial artery of the pressure detection element 40 _a to 40 _e is a maximum value, the positional relationship is persistent in the relatively long term.

[0018] In pulse wave signal reading routine shown in FIG. 5, for example, the value of the pressure pulse wave signal S _a or S _e from the pressure detection element 40 _a to 40 _e are each 1, 2 at the beginning, 5, If the noise is caused by body movement in the case of 2, 0, the noise value N is evenly added to the values of the pressure pulse wave signals S _{a to} S _e from the respective elements to obtain 1 + N, 2 + N, 5 + N. 2 + N, 0 + N. Therefore, the average value A of their noise is summed pressure pulse wave signal S _a to S _e value is N + 2, the mean value from the value of the noise is added PPW signal S _a to S _e When A is subtracted, it becomes -1, 0, 3, 0, -2, and the noise component is removed and only the pulse wave component is obtained. Then, the maximum value among the values of the pressure pulse wave signals S _{a to} S _e after removal of the noise component is adopted and stored for calculating the pulse rate P _d . As a result, for example, a waveform composed of points indicating pressure values stored every 16.6 milliseconds, that is, a pressure pulse wave is obtained.

Returning to FIG. 4, in step SS2, it is determined by a predetermined algorithm whether or not one pressure pulse wave synchronized with the heartbeat is input, that is, whether a pair of upper peak and lower peak is formed. It If the determination in step SS2 is negative, this measurement routine is ended, and steps SS1 and SS2 up to that point are repeated until a signal for one pressure pulse wave is input. However, if the determination in step SS2 is affirmative, the autocorrelation coefficient C of the pressure pulse wave is calculated in accordance with Equation 1. In Equation 1, u _i is the in-phase value of the immediately preceding pressure pulse wave, and v _i is the in-phase value of the current pressure pulse wave. If the waveforms completely match, the self-phase relation number C1 is obtained.

[0020]

## EQU1 ## C = Σu _i · v _i / Σv _i · v _i

In the following step SS4, it is determined whether or not the autocorrelation coefficient C calculated in step SS3 is in a preset range, that is, whether it is larger than the minimum value C _min and smaller than the maximum value C _max. To be judged. A value of about 0.6 is adopted as the minimum value C _min, and a value of about 2.0 is adopted as the maximum value C _max . If the determination at step SS4 is negative, this routine is ended, but if the determination is positive, it means that the pressure pulse wave of a normal waveform has been input, so at step SS5, for example, The pulse rate P _r is calculated based on the time interval between the peaks of the previous pressure pulse wave and the current pressure pulse wave.

In the subsequent step SS6, the display pulse rate P _d is calculated from Equation 2. The display pulse rate P _d is for gently displaying changes in the pulse rate, and coincides with the pulse rate P _r during the stable period.

[0023]

[Formula 2] P _d = K _w1 · P _d + K _w2 · P _r

Then, in step SS7, it is judged whether or not the display pulse rate P _d is within a preset range, that is, whether it is larger than the minimum set value P _dmin and smaller than the maximum set value P _dmax. To be done. The minimum set value P _dmin and the maximum set value P _dmax are set to the target exercise intensity, for example, by operating the setting push button switch 18 in a state where the setting push button switch 16 is switched to the setting mode. It is set with a value that takes into account age and other factors.

If the determination in step SS7 is negative, an abnormal determination is made in step SS8, and then in step SS9, the display pulse rate P _d obtained in step SS6 and the determination in step SS8 are made. The result is displayed. In the subsequent step S S10, the display pulse rate P _d obtained in step SS6 and the determination result of step SS8 are output to the voice synthesis circuit 74, and the display pulse rate P _d and the determination result of step S S8 are output. Is transmitted to the voice output unit 12. In the audio output unit 12, the reception circuit 78 receives the transmitted signal and reproduces the audio signal, and the amplification circuit 80 drives the micro speaker 82 to output the audio. In this case, the voice of the display pulse rate P _d may be a word that directly expresses the content of the numerical value, or may be a continuous sound having a frequency corresponding to the numerical value. Further, the voice that indicates the abnormal state may be a word that directly expresses the numerical content, or a tone of a tone color corresponding to the abnormal state. If the determination in step SS7 is affirmative, steps SS9 and onward are directly executed.

As described above, according to the present embodiment, the pressure pulse wave generated from the radial artery is detected by the pressure sensor 36 pressed against the radial artery of the living body, and the measurement display corresponding to the pulse rate calculating means is displayed. The pulse rate P _d per unit time is calculated from the pressure pulse wave by the unit 10, and the pulse rate P _d is output as voice from the voice output unit 12.

As described above, since the pressure sensor 36 is pressed against the radial artery of the living body, the pressure pulse wave generated from the radial artery is stably detected regardless of the vibration due to the motion. Measurement accuracy is improved. In addition, since the calculated pulse rate P _d is output by voice from the voice output unit 12, it is possible to check one's pulse rate during exercise without pausing the exercise or slowing the exercise motion. , The pulse rate corresponding to the driving load at that time can be accurately obtained.

Although one embodiment of the present invention has been described above with reference to the drawings, the present invention can be applied to other modes.

For example, in the above-described embodiment, the audio output unit 12 is configured to receive the signal radio wave from the measurement display unit 10, but it may be configured to receive the signal via the lead wire. It doesn't matter. Further, the audio output unit 12 may be integrally provided in the main body case 20 of the measurement display unit 10.

Further, the apparatus of the above-described embodiment may be further provided with an analysis apparatus that receives a signal radio wave transmitted from the measurement display unit 10 and analyzes the pulse rate P _d .

Further, the voice representing the abnormal condition in the above-mentioned embodiment may include a notice of the abnormal condition and a preventive measure for avoiding the abnormal condition.

Although not individually listed, the present invention can be variously modified without departing from the spirit thereof.

[Brief description of drawings]

FIG. 1 is a perspective view showing a measurement display unit of a pulse rate detection device which is an example of the present invention.

FIG. 2 is a perspective view showing an audio output unit of the pulse rate detection device which is an example of the present invention.

FIG. 3 is a circuit diagram illustrating the electrical configuration of FIGS. 1 and 2.

FIG. 4 is a flowchart illustrating a main part of a measurement operation of the measurement display unit of FIG.

FIG. 5 is a flowchart illustrating an operation of a pulse wave signal reading routine in step SS1 of FIG.

[Explanation of sign]

 10: Measurement display unit (pulse rate calculation means) 12: Audio output unit (audio output means) 36: Pressure sensor

Claims (1)

[Scope of utility model registration request] 1. A portable pulse rate detection device which is attached to a part of a living body and detects the pulse rate of the living body, wherein a pressure pulse wave generated from the artery by being pressed by a part of the artery of the living body. And a pulse rate calculating means for calculating the pulse rate per unit time from the pressure pulse wave detected by the pressure sensor, and the pulse rate calculated by the pulse rate calculating means or its change by voice. A portable pulse rate detection device comprising: a voice output device for outputting.