JPS59225037A - Cardiac pulse meter with attachment - 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 heart rate meter that includes a pair of detection electrodes and a heart rate measuring circuit, and is capable of detecting cardiac potential signals from two or more force points on the human body surface.

Conventionally, there is an electrocardiogram guidance method as one method of measuring heart rate. This method detects minute electrical signals from the heart that are generated when the heart contracts. As shown in FIG. 1, the minute electric signals of the heart include waves such as P waves, QR-B waves, and T waves, which appear periodically. Kono'! ;
The amplitude of the 1Q-R-8 wave is quite large and varies from person to person, but it is in the range of approximately 0.2 mV to 1°OmV.

Therefore, the method of detecting Q-R-G waves is generally used.
ing. Furthermore, commercial frequency noise induced on the surface of the body outside the body is superimposed on the cardiac potential signal. For this reason, when measuring heart rate, it is necessary to remove large-amplitude commercial frequency noise and to dip the small-amplitude electrocardiogram signal by 7°. FIG. 2 shows an example of a detection circuit for the above-mentioned cardiac potential induction method. 1 is a detection electrode made of a conductor such as stainless steel or silver chloride.

One surface of the detection electrode 1 is exposed to the exterior surface of the pulse meter.

To measure the pulse, the person being measured must place a part of the body surface, for example, a part of the skin on the man's arm (left arm), in close contact with the circuit ground, and then touch a part of the skin of the other arm (right arm). For example, the measurement is carried out by bringing the fingertip into contact with the detection electrode 1. By connecting the circuit ground to the back cover of the pulse meter, the above measurement operation can be easily carried out.

The detection electrode 1 is connected to an amplifier circuit 2.

In the amplifier circuit 2, an arbitrary amplification factor can be selected for the operational amplifier and the plurality of resistors.

The electrocardiogram signal and noise amplified to the required size by the amplifier circuit 2 are banded. bus, input to filter 3. band. bus. Filter 3rd is composed of an operational amplifier, a plurality of resistors, and a plurality of capacitors, and the n1 center frequency and Q value can be selected relatively arbitrarily. band, bass. Filter 3 removes the commercial same wave number noise and outputs only the n1 cardiac potential signal.

The outputs of the band, bus, and filter 3 are input to a voltage comparator circuit 4. The voltage comparison circuit 4 detects only the cardiac potential signal and outputs a pulse signal to the output terminal.

The output signal of the voltage comparison circuit 4 is input to the arithmetic processing circuit 5. In the arithmetic processing circuit 5, the period (T5eC) of the incoming cabal signal is counted and the pulse rate per minute is calculated. The relationship between the input caval pulse period (Tsec) and the pulse rate Pcvq is expressed by the following equation.

The output signal of the arithmetic processing circuit 5 is input to the display circuit 6.
The liquid crystal display etc. will move and the pulse rate will be displayed.

Although the heart rate can be measured by the above measurement principle, in the case where the electrocardiogram signal is collected from the left and right hands, for example, the right finger must be touched on the detection electrode 1, and the heart rate during running; Normally, it is necessary to stop running and come to a standstill. Therefore, a belt-type electrode as shown in FIG. 3 was devised. This belt-type electrode can be worn on the forehead or chest. 7 is a highly flexible belt, and 8 is the aforementioned belt? Buckle for securing to the chest; 9. 2 is a pair of electrodes arranged so as to be in close contact with the skin, 11 is a conductor wire connected to the electrode 9, and 2 is a conductive wire connected to the electrode 10. C conductor wire 11. [2 is connected to the attachment 13.

By using all of the belt-type electrodes mentioned above, it is possible to measure the heart rate both in a stationary state and while driving, but it is cumbersome to wear the belt when measuring in a stationary state.

Therefore, it is desirable to use a combination of two methods: in a stationary state, the heartbeat is measured from a finger using the detection electrode 1 as shown in FIG. 2, and when the vehicle is running, the heartbeat is measured from a belt electrode as shown in FIG. In this case, it is uneconomical and impractical to prepare two sets of detection electrodes 1 and heart rate measurement circuits.

The present invention eliminates the above-mentioned drawbacks and provides a device that can measure heartbeats from belt electrodes and from both hands using only one pair of detection electrodes and a heartbeat measurement circuit.

Next, the present invention will be explained in detail using the drawings. Figure 4 (b)) is a front view of a heart rate monitor that can measure heart rates from both hands.
FIG. 4(b) is a sectional view thereof. Wear the heart rate monitor 14 on your arm and touch the detection electrode 1' with one finger! f - Press to display 1
The heart rate is displayed at 5. In the cross-sectional view of FIG. 4(6), the detection electrode 1 is supported by a body 17 via a leaf spring 16. The body 17 is made of an insulating material such as plastic.
The detection electrode 1 is insulated from the back cover 18. The back cover 18 is made of stainless steel and is grounded to the power source for the heart rate measurement circuit. The retaining ring 19 is made of a conductive material and is fitted into the recess of the detection electrode 1. The lead plate is attached to a part of the inner wall surface of the body 17 by heat caulking, and one end of it is attached to the back cover 18.
is in contact with. The lead plate is made of a highly conductive material. The heartbeat measuring circuit shown in FIG. 2 is mounted on the printed circuit board 21, and the input of the amplifier 2 is also wired.

Further, FIG. 5 shows a state in which the attachment 13 of FIG. 3 is inserted into the heartbeat side 14 of FIG. 4. Conductive wires 11 and 12 for transmitting cardiac potential signals are connected to lead terminals n and 24 formed on the inner wall surface of the attachment 13, and are in contact with the t'L-s detection electrode 1 and the back cover 18, respectively. are doing. The twisted detection electrode 1 is brought into contact with the input 22 of the heart rate measurement circuit by the fitting force of the attachment. Therefore, by attaching the belt electrode to the entire head or chest, the collected cardiac potential signal is input through the conductor wires 11, 1.2 → lead terminal field, 24 → detection electrode 1 back cover 18 → heart rate measurement circuit. This makes it possible to measure heart rate.

As described above, according to the present invention, if all seven belt electrodes are prepared, cardiac potentials can be collected from a plurality of human body parts using the same detection electrode and the same heart rate measuring circuit, and the heart rate can be measured. is possible.

[Brief explanation of the drawing]

Figure 1 is a waveform diagram of an electrocardiogram signal collected from the surface of the human body, Figure 2 is a heart rate measurement circuit diagram, Figure 3 is a structural diagram of the belt electrode, and Figure 4 @) is the front view of the heart rate monitor. FIG. 4(6) is a sectional view of the heart rate monitor, and FIG. 5 is a sectional view of the heart rate puller when the fitting is fitted. 11. Detection electrode 131. Attachment and above Applicant Daini Seikosha Co., Ltd. Agent Patent Attorney Mogami (See Figure 3 and Figure 4) Figure 5

Claims (1)

[Claims] A heart rate monitor with an attachment that collects all electrocardiogram signals from multiple parts of the human body and performs the heartbeat side, collects multiple electrocardiogram signals at non-same times from the plurality of parts of the human body via belt electrodes and attachments. A heart rate meter with an attachment, characterized in that by fitting the attachment and the heart rate meter, heart rate can be measured using one detection electrode and one heart rate measuring circuit included in the heart rate meter.