JPS58206723A - Cardiac potential inducing electrode - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cardiac potential-visiting electrode for a cardiac potential-detecting heart rate meter.

Since heart rate is a good indicator of exercise intensity, it is now common knowledge to measure heart rate during exercise and training in a safe and scientific manner. For this reason, there are two main methods for detecting heartbeats, for which devices incorporating heart rate monitors in wristwatches have been developed. One is an optical sensor that detects the pulsation of peripheral arterial blood, and the other is a sensor that picks up the cardiac potential that controls the contraction of the heart muscle on the body surface. The latter requires little power for detection and is therefore a suitable method for combination with a wristwatch.

The present invention will be explained below with reference to the drawings. FIG. 1-α is a diagram showing the appearance of an electronic wristwatch incorporating a cardiac potential detection type heart rate meter and how to use the same, and FIG. 1-α shows the principle of cardiac potential detection. In the figure, reference numeral 1.2 denotes a metal electrode, which is attached to the front and back surfaces of a case 4 made of an insulating material such as plastic. Usually, electrode 1 contacts the right finger and electrode 2 contacts the left hand. FIG. 2 schematically shows the cardiac potential shaping obtained by such an electrode arrangement.

The cardiac potential induced at the electrodes 1.2 is electronically processed by an electronic circuit 6 and displayed as a heart rate on a display 5. 3 is
This is a switch that allows you to switch between the functions of the wristwatch and heart rate meter, and 7 is a battery that drives the wristwatch itself and the heart rate sensor.

Next, the operation of the heart rate meter 4 will be explained with reference to FIG. 3.4. The cardiac potential induced by the electrode 1.2 (in this example, the cardiac potential between the subject's left hand and right hand, that is, in the standard limb guidance method, the cardiac potential) is The signal is guided to a stationary amplifier 8 and differentially amplified. The band P device 9 selects the QR3 wave indicating ventricular contraction from among the cardiac potentials, and removes unnecessary signals such as T waves indicating ventricular relaxation and alternating current noise and myoelectric potential mixed into the cardiac potential. The center frequency of this band p-wave generator is usually 20
It is Hz. The main amplifier 10 greatly amplifies the QR9 wave emphasized by the V-wave generator, and the level detector 11 generates a signal "le, . . . synchronized with the cardiac potential QR9 wave (
Figure 4). The waveform shaper 12 is m6L: Ia L13.
. . . as a complete pulse signal W11.・・・・・・
(Figure 4). The interval between the pulse signals W1 and W is milled by the counter 16 according to the clock signal OL (FIG. 4). The heart rate conversion ROM 14 is a read-only memory IJ (ROM ). The output signal of the heart rate conversion ROM is supplied to the latch circuit 1.
5, the data converted into the heart rate for the next period is held until it is transferred and displayed as the heart rate on the liquid crystal display 5 via the decoder 16. 17 is a control signal generator that generates signals for controlling the clock signal OL, the latch circuit, and the decoder;
is the oscillator that produces the source signal for these signals and also produces the clock time standard No. 14. 19 is a clock (No. 4 generation circuit), in which all functions of a clock are performed. This part is already well known in digital watches, so detailed explanation will be omitted. 20 is the heart rate generator circuit. This is an electronic switch for connecting the input side of the decoder to the heart rate meter body #6iljl when the measurement mode discharge button is pressed.

Now, Figure 1-α (The heart rate meter shown here is extremely convenient for measuring heart rate when not linked, but it is important to keep the pomegranate stable on electrode 1 during exercise. I can't do it,
It is difficult to measure a stable heart rate. Therefore, Figure 5-
An arm electrode as shown by α, 5-b has been put into practical use. In FIGS. 5-α and 5-b, 21 is a band for fixing the arm electrodes 1' and 2' to the chest, and the arm electrodes 1/, 2
/ is connected to the electronic circuit in the main body 4 via the 21 wire 22, 22'. Reference numeral 25 denotes a pin for fixing the conducting wires 22 and 22' to the chest so that they do not become loose.

Since the arm electrode is placed close to the heart, it is possible to obtain large-amplitude cardiac potentials, but it has a major drawback in practical use: it requires removing the shirt to remove the electrode.

6-a and 6-b show an embodiment of the present invention. 24
is a band for covering the forehead of the thin electrode 1',
The electrodes are connected to the heart rate meter main body 4 via a conductive wire 22. The other % pole is attached to the back side of the main body 4 (see FIG. 2) and is tightly attached to the left arm. Figure 6-b is the frame 1 of the present invention.
The m-pole family is schematically shown. FIG. 7-α shows the cardiac potential obtained with a single pole according to the present invention, and FIG. 7-b shows the cardiac potential obtained with the conventional right-left hand electrode (see FIG. 2). Original E! It can be seen that the electrode according to A obtains a cardiac potential equivalent to that of the conventional electrode.

FIG. 8 shows another embodiment of the present invention, in which the forehead electrode is
It is attached to the inside of the hat 25.

Reference numeral 1' denotes a forehead electrode, which is connected to a heart rate monitor via a conductive wire 22. 25' is a fastener for tightly fitting the forehead electrode 1' to the forehead.

FIG. 9-α shows another embodiment of the present invention.

1' is 1. The earlobe is held between metal electrodes embedded in the ear holder 26. This earlobe electric 4! ! I
i1' is connected to the heart rate meter 4 by a lead 1fs22.

FIG. 9-b shows the cardiac potential induced between the earlobe electrode and another electrode attached to the back side of the main body 4 (see FIG. 2). A cardiac potential equivalent to a standard cardiac potential (right hand - left hand) shown by H7-h is obtained.

As explained above, according to the present invention, cardiac potential during exercise can be easily and stably induced without using arm electrodes that are troublesome to wear, and as a result, reliability even during exercise can be induced. This method has advantages such as being able to measure a certain heart rate.

[Brief explanation of drawings]

Figure 1 (α) is a sketch showing an electronic wristwatch with a built-in electrocardiogram detection heart rate meter worn on the wrist, and Figure 1Cb) shows an electronic wristwatch with a built-in electrocardiogram detection heart rate meter. Conceptual diagram explaining the structure: 1...Finger electrode 2...Left hand magnetic pole 4...Plastic case 6...Electronic circuit 7...・Battery Figure 2 is a schematic diagram illustrating the cardiac potential waveform, and Figure 3 is a
An electronic circuit block diagram of an electronic wristwatch with a built-in heart rate detection type heart rate meter. α) is the 5F glossy drawing showing an example of the use of the chest acupuncture pole.
yJCb) is a schematic diagram showing the structure of the chest electrode, Figure 6 (
α) is a schematic diagram showing an example of the use of the forehead electrode according to the present invention; FIG. 6Cb) is a schematic diagram showing the structure of the forehead electrode; 7th PA (α) is @( Waveform diagram showing the cardiac potential induced between the head) electrode and the left hand electrode Figure 7 Ch)
25 is a waveform diagram showing a conventional cardiac potential induced between left and right hand electrodes. FIG. 8 is a sketch diagram showing another embodiment of the present invention.
...Hat 1' ...Forehead 1 electrode Fig. 9(a) is a sketch showing another embodiment (ear electrode) of the present invention, Fig. 9(b) 1 is a waveform diagram showing a cardiac potential induced between the ear electrode (right side) 1 and the left hand electrode according to the present invention. Figure 5 (+2) Figure 5 (b) Figure 6 (α) Go571;! J (α) Figure 7 (υ) Figure 8

Claims (1)

[Claims] In an electrocardiogram detection type heart rate meter that uses a pair of electrodes to induce electrocardiograms between two different points on the body surface, and expresses the heart rate per minute from the repetition period of electrocardiograms induced in the electrodes. , special grade electrocardiogram electrodes in which one electrode contacts the surface of the face and the other electrode contacts part of the left or right hand.