JPS6115390B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital display wristwatch heart rate monitor.

Conventionally, pulse measurement, which is used to determine heart function, uses a clock to count the pulse rate for 15 seconds to 2 minutes and converts it to per minute. Heart rate has been measured using blood pressure waveforms and heart waveforms.

However, the former requires a lot of measurement time to accurately measure the pulse, and it is not always easy for an amateur to detect the pulse reliably.

On the other hand, with the latter, it is possible to accurately measure pulse rate, but the device is large and inconvenient to carry around even if it is portable, and it is almost impossible for amateurs to operate it. However, the drawback was that the pulse rate could not be easily measured.

Therefore, the present invention was devised to eliminate these drawbacks. Conventionally, wristwatches are things that we carry with us, but these are indispensable in daily life, and people feel less uncomfortable about carrying them. Not very accurate. In addition, metal is often used for the outer case of watches, including the band, and this metal part is used as one electrode, and other electrodes are provided on other parts of the watch, and these electrodes are used to measure electrocardiographic waveforms. The purpose is to make it possible for anyone to easily measure the pulse rate by detecting it, inputting it into a calculator, instantly calculating the heart rate, and displaying the heart rate on the time display. There is.

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is one of the block diagrams showing an embodiment of the invention, and FIG. 2 is a block diagram showing another embodiment of the invention.

Parts 4 and 17 surrounded by dotted lines in Figures 1 and 2
is a known crystal clock circuit.

FIG. 1, FIG. 5, and FIG. 2, FIG. 18 show detection electrodes attached to the exterior of the wristwatch.

FIG. 3 is one of the embodiments showing the detection electrodes of FIG. 1, FIG. 5 and FIG. is provided by pasting a metal plate or metal plating on the surface of the dial-side lid 29 made of an insulating material. Note that 30 is a display that displays the time and heart rate.

FIG. 4 shows another embodiment shown in FIG. 1 5 and FIG. 33 is provided by pasting a metal plate or plating with metal.

FIG. 5 shows another embodiment shown in FIG. 1 5 and FIG. 2 18, in which a metal band 34 serves as one detection electrode, and another detection electrode 35 is provided on the side of the watch body case. Case arm contact surface 3
6 and the connecting surface 37 with the band 34 is made of an insulating material.

FIG. 6 shows another embodiment shown in FIG. 1 5 and FIG. 2 18, in which a metal wristwatch body case 38 serves as one detection electrode, and an arm connection surface of a band 39 made of an insulating material such as a leather band. Another detection electrode 40 is provided on the opposite surface.

The detection electrodes shown in Fig. 3 27, 28, Fig. 4 31, 32, Fig. 5 34, 35, Fig. 6 38, 40 are electrically connected to the circuit inside the main body case via leads or the metal main case. has been done.

When the wristwatch equipped with the detection electrode is worn on the wrist, one detection electrode will always come into contact with one wrist, and the fingertip of the other arm on which the wristwatch is not worn. It is now possible to touch another detection electrode.

When electrodes are brought into contact with both hands of a person, the 8th
Cardiac voltage as shown in the figure is detected.

That is, this heart voltage is detected in FIG. 1, FIG. 5, and FIG. 2, FIG. 15. However, in actual cases, humans are in environments with commercial power sources and various high-frequency noises, so commercial frequency and pulse noises mix into the detection electrodes at the same time as the heart voltage.
The outputs of 5 are input to filter circuits 6 and 19, respectively, and noise components such as commercial frequencies and high frequencies are removed, and only the electrocardiogram waveforms are input to amplifier circuits 7 and 21.
is input.

The amplification circuits 7 and 21 amplify the cardiac voltage to a logic level, and the outputs of the amplification circuits 7 and 21 are input to arithmetic circuits 8 and 22.

Arithmetic circuits 8 and 22 receive reference signals from frequency dividing circuits 2 and 15 in the crystal clock circuit, and receive reference signals from amplifier 7.
Measure the period of the signals from and 21, and set this value to 1
The number of times per minute is calculated and the output thereof is input to the decoder circuits 10 and 23.

The decoder circuits 10 and 23 convert the signal into a 7-segment display signal, and the output thereof is input to one input terminal b and b' of the changeover switch circuits 11 and 24.

Decoder circuits 3 and 15 in the crystal clock circuit are:
It is input to other input terminals a and a' of the changeover switch circuits 11 and 24.

One of these two inputs a, b and a', b' is connected to the subsequent driver circuits 12 and 25 by the changeover switch circuits 11 and 24.

As shown in FIG. 1, one method for switching the changeover switch circuit is to integrate the voltage of the electrocardiogram waveform obtained from the amplifier 7 with an integrator 9 to generate a DC voltage, and use this DC voltage to switch the changeover switch 11. is operated, and when there is a DC voltage, the output of the changeover switch 11 is connected to the input b, and when there is no DC voltage, the output of the changeover switch 11 is connected to the input a.

As another method, as shown in Figure 2,
There is a method of sending DC voltage to the changeover switch 11 using a touch switch circuit 20 driven by a change in capacitance that occurs when both hands touch the detection electrode 15 or by noise from a commercial frequency, etc., and the DC voltage generation time is monostable. circuit and bistable circuit. The former applies a DC voltage to the changeover switch 24 for a certain period of time immediately after contacting the detection electrode 15, and the latter applies or does not apply DC voltage to the changeover switch 24 every time the detection electrode 15 is contacted. It is a flip-flop type.

The driver circuits 12 and 25 generate a voltage or current necessary for the display element, and send it to the display circuits 13 and 26.

The display circuit is a 5-digit 7-segment display element SE
The third digit is provided with a number and a point _P1 for distinguishing hours and minutes, as shown in FIG. 9, and a decimal point _P2 is placed in the third digit from the top.

For time display, the first digit, second digit,
A 7-segment display is displayed for the 4th and 5th digits, and a dot is displayed for the 3rd digit.When displaying heart rate, a 7-segment display is displayed from the top to the 4th digit, and a dot is displayed at the right end of the 3rd digit. Displayed with a decimal point.

As described above, according to the present invention, a wristwatch that is easy to carry at all times has a simpler structure, and when necessary, it can be easily carried by simply touching a part of the outer surface of the watch with the fingertips of the other hand that is not wearing the wristwatch. The person's heart rate can be measured with this watch, and the measurement time is only one heartbeat, so it is a short measurement time of about 2 seconds or less, and the display method is converted to per minute. It is possible to easily determine whether the heart rate is good or bad, and it can provide a necessary information source for people who are particularly prone to arrhythmia, bradycardia, tachycardia, etc., and has great medical effects. It seems that there is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is another block diagram showing an embodiment of the present invention, FIG. 3 is a diagram showing a detection electrode, and FIG. 4 is a diagram showing another detection electrode. Figure 5 is a diagram showing yet another detection electrode, Figure 6 is a diagram showing still another detection electrode, and Figure 7 is a diagram showing still another detection electrode.
The figure shows an electrocardiogram lead, FIG. 8 is an electrocardiogram, and FIG. 9 is a diagram showing the contents of the display. 1, 14... Crystal resonator, 2, 15... Frequency dividing circuit, 3, 16... Clock display decoder circuit, 4, 1
7...Crystal clock circuit, 5, 18...Detection electrode,
6, 19... filter circuit, 7, 21... amplifier circuit,
8, 22... Arithmetic circuit, 10, 23... Heart rate decoder circuit, 11, 24... Changeover switch circuit,
12, 25... Driver circuit, 13, 26... Display circuit, 9... Integrating circuit, 20... Touch switch circuit, 27, 38... Watch body exterior case electrode, 28, 32... Top cover surface electrode, 29 ,33...
...Insulating front cover, 30...Display unit, 31, 34...Band electrode, 35...Exterior side electrode, 36...Insulating back cover, 37...Insulating band stopper, 39...Insulating band, 40... Band surface electrode, 41... minute time separation point, 42... decimal point.

Claims (1)

[Scope of Claims] 1. In an electronic wristwatch having a digital display section, at least one electrode provided on a surface of the exterior of the wristwatch that comes into contact with the arm on which the wristwatch is worn;
at least one other electrode electrically insulated from the electrode and provided on a surface of the exterior part of the wristwatch that does not contact the arm on which the wristwatch is worn; and at least one other electrode connected to these two electrodes and in contact with the arm. Measure the time between peaks derived from at least two heartbeats among the cardiac voltages detected by touching an electrode placed on a surface other than the human body with another part of the human body, and convert it to the number of heartbeats per minute. A wristwatch heart rate monitor comprising an arithmetic circuit and a display circuit connected to an output terminal of the arithmetic circuit and outputting the result of the arithmetic operation as a signal that can be displayed on the digital display section. 2. The wristwatch heart rate monitor according to claim 1, wherein the digital display section is configured to switch between a clock display and a heart rate display as necessary.