JPS5886140A - Use of pulse meter - Google Patents

Abstract

(57) [Abstract] 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 method of using a pulse needle.

In particular, it relates to convenience for preventing destruction of pulse measurement circuits due to static electricity.

Conventionally, electrocardiogram-guided method (el
electro aarlio graphy). This method is a method of detecting minute electrical signals of the heart that occur prior to the contraction of the heart. The characteristics of this method are ■ 2
This is a simple and highly reliable method that allows you to measure by simply touching two metal electrodes with your left and right hands or fingers.

■ Detecting the heart's electrical signals requires a very small amount of power (approximately 100
(μW), making it suitable for small and long-life devices.

By using the electrocardiogram guidance method described above, a small portable pulse meter can be made. However, with conventional circuits and methods of use in electrode configurations, if static electricity discharge occurs between pieces where a human body or clothing comes into contact with the detection electrode, the elements of the circuit input section connected to the electrodes will be destroyed by the static electricity. This can lead to a situation where the pulse detection and measurement functions are lost.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional art.No matter what environment the pulse meter is used in, it prevents the pulse detection and measurement function from being destroyed by static electricity and improves reliability. The purpose of this invention is to provide a method for using a pulse meter with high performance.

The present invention will be explained in detail below with reference to an embodiment shown in FIG. 1iK. Figure 1 is a signal waveform of the electrocardiogram guidance method used in the present invention. Generally, the cardiac potential signal induced between the left and right arms of the human body is composed of P waves, Q waves, -R-B waves, and P waves. and these waves appear periodically.

Among these, the amplitude of QR-8ill is the largest, and although there are differences between people, it is within the range of approximately (L 2 mV).

Therefore, a method of detecting QR-[1 wave is generally used. Furthermore, the above-mentioned cardiac potential signals include
iK-induced commercial frequency noise is superimposed.

In this rounded pulse measurement, it is necessary to remove large-amplitude commercial frequency noise and pick up minute-amplitude electrocardiographic signals.

FIG. 2 shows an example of a detection circuit for the electrocardiographic induction method described above.

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 needle. To measure the pulse rate, the person being measured should place a part of the body surface, for example, part of the skin on one arm (left arm), in close contact with the circuit ground, and then touch a part of the skin on the other arm (right arm). , for example, by bringing a fingertip into contact with the detection voltage &1. By connecting the circuit ground to the container layer plug of the pulsometer, the side chamber operation described above can be easily performed.

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

The amplifier circuit 2 can select any amplification factor using an operational amplifier and a plurality of resistors.

The electrocardiogram signal and noise amplified to a predetermined magnitude by the amplifier circuit 2 are input to a band pass filter 5. The band pass filter 3 is composed of an operational amplifier, a multiplier resistor, and a large number of capacitors, and the center frequency and Q value can be selected relatively arbitrarily. Band pass filter 3 removes commercial frequency noise and outputs only the electrocardiogram signal.

The output of the band pass filter 3 is 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. The arithmetic processing circuit 5 counts the period (T se ) of the input pulse signal and calculates the pulse rate per minute. The relationship between the input pulse period (T sw ) and the pulse rate P is expressed by the following equation.

The output signal of the arithmetic processing circuit S is input to the display circuit 6,
The pulse rate is displayed by driving a liquid crystal display.

The above cardiac potential detection system measures pulse rate by providing a switch circuit that controls energy supply from the power source [2].
When not in use, the switch circuit is set to 011 to save energy.

However, as shown in the table, when static electricity is discharged to the electrode 1 installed on the surface of the pulse meter, the input transistor of the operational amplifier constituting the amplifier circuit 2 will be damaged by static electricity.

Static electricity is generated in daily life, such as when putting on and taking off clothes. This static electricity is discharged when a charged body approaches the detection electrode 1, regardless of whether the pulse meter is used or not.

Therefore, in the present invention, destruction of the detection circuit due to static electricity is prevented by the method described below. Figure 5 shows the original m diagram of Seimei's rounding. In order to avoid confusion, only the input section of the detection circuit is shown.

■ Normally (when the pulse meter is not used, that is, when the person being measured is not in contact with the detection electrode), the detection electrode 1
is grounded via switch 7. Therefore, even if static electricity is discharged to the detection electrode 1, the static electricity flows to the ground side.

(2) When using the pulse needle, the person to be measured first brings his or her fingertip into contact with the detection voltage '4'. At this moment, the electricity accumulated on the body surface flows through switch 7 to the ground side. When the switch 7 is opened 1- to release the ground while still in contact with the detection electrode 1, the detection circuit detects the cardiac potential (electrical pulse) input from the detection electrode 1 and measures the pulse.

FIG. 4 shows the structure of a detection electrode directly used in implementing the present invention to realize the method for preventing electrostatic damage described above.

The fourth figure shows a plan view of the pulse needle.

The pulse rate is displayed on the display 8. When measuring the pulse rate, turning on the measuring head-do switch t turns on the power to the heart rate measuring circuit and makes measurement possible. The subject contacts the detection electrode 1 with his/her finger at this position.

FIG. 4(b) shows a cross-sectional view around the detection electrode.

The detection voltage 111 is supported by the body 12 via the spring 11. The body 12 is made of an insulating material such as plastic,
The detection electrode 1 and the back cover 13 are insulated.

The back cover 1s is made of stainless steel. It has a 14-inch windshield. One end of the detection electrode 1 is connected to a circuit input cutout on a circuit board 16 via a lead terminal 15. The lead terminal 15 has a spiral structure so as to have a flexible structure.The stopper 18 is made of a conductive material, and the detection voltage 111
is inserted into the recess.

The lead plate 17 has a heat caulking force applied to a part of the inner end surface of the body 12, and the mounting plate is made of stone. The lead plate 17 is naturally made of a conductive material. A part of the lead plate 17 is connected to the detection electrode 1 of the front ring 18.
It has a structure in which it contacts the protruding portion and does not directly contact the detection electrode 1. Further, another part of the lead plate 17 is connected to a ground pattern on the circuit board 16 via a lead terminal 19. The lead terminal 19 can also be directly grounded without using a circuit board.

Now, the detection electrode 1 having the above structure is normally pushed up by the spring 11, and the retaining ring 18 is in contact with the lead 1 [17]. At this time, the detection electrode 1 is electrically grounded via the retaining ring 18, the lead plate 17, and the lead terminal 19. This corresponds to the state in which the switch is turned on in FIG.

Therefore, even if clothing or the like touches the detection electrode 1 and electrostatic discharge occurs during normal operation, the electrostatic electricity will flow to the ground side. In addition, when measuring pulse, the moment the person to be measured touches the detection electrode 1,
Static electricity accumulated on the body surface flows to the ground side.

Next, the person to be measured pushes the detection electrode 1 lightly.

At this time, since the retaining ring 18 separates from the lead plate 17, the detection electrode 1 is electrically disconnected from the ground.

This corresponds to the state in which the switch 7 is turned off in FIG. 115, and pulse measurement is started.

Next, when the pulse measurement is finished and the finger of the person to be measured leaves the detection electrode 1, the detection electrode 1 is returned to its normal position* by the action of the claw 11, and is electrically grounded again, allowing detection using static electricity. As described above, according to the method of using the pulse meter of the present invention, the detection electrode can be simply connected to Static electricity is completely removed by touching a part of the subject's skin to the position, then the switch interposed between the detection electrode and ground is opened, and then the cardiac potential input from the detection electrode ( By measuring the pulse rate (electrical pulse) with a detection circuit, it has the effect of accurately detecting the pulse rate.

Furthermore, the above-mentioned effects also have the effect of making it possible to obtain a pulse needle that is small, has a long life, is easy to measure, and has high reliability.

[Brief explanation of drawings]

FIG. 1 shows the signal waveform of the electrocardiogram guidance method. FIG. 2 is an example of a detection circuit. FIG. 5 is a diagram for explaining the electrical operation of the electrical circuit directly used in the usage method of the present invention. ! It is a diagram. FIG. 4C) is a plan view of the pulsometer used in the present invention. FIG. 4(b) is a sectional view of the vicinity of the detection electrode used in the present invention. 1...Detection H1ll 2...Amplification circuit 3.
・Band pass fist filter

Claims (1)

[Claims] The detection electrode includes a detection electrode for receiving a human body O cardiac potential signal, a switch interposed between the detection electrode and one terminal of the electrical potential, and a detection circuit for detecting the electrocardiographic potential signal. A method of using a pulse needle, comprising placing a part of a human body on the needle, then opening the switch, and then supplying the cardiac potential signal to the detection circuit via the detection electrode to measure the pulse.