CN103156592A - Wireless optical electrocardio detecting instrument - Google Patents

Abstract

The invention discloses a wireless optical electrocardiogram detector, which comprises a photodiode, a frequency division circuit by two, an operational amplifier circuit, a monostable trigger circuit and a single-chip microcomputer circuit, and the signal generated by the photodiode passes through the frequency division circuit in turn. , the operational amplifier circuit, and the monostable flip-flop circuit are transmitted to the single-chip microcomputer circuit. Through the detection of photodiodes and the use of single-chip microcomputers to process the data, the purpose of accurate and simple measurement of ECG is achieved. Because the circuit is relatively small, the equipment of the wireless optical ECG detector is more convenient to carry, thus achieving accurate detection and high efficiency. High and easy to carry purpose.

Description

Wireless Optical ECG Detector

technical field

The invention relates to the field of medical equipment, in particular to a wireless optical electrocardiogram detector.

Background technique

Currently, there are two types of pulse rate monitoring, electrical and optical measurements. The electric pulse speed monitoring has a digital heart rate transmitter, which is measured by the user on the chest, which is inconvenient during strenuous exercise.

Light pulse rate monitors measure a person's pulse by checking the illumination of different light sensors. Using a photodiode or phototransistor as a sensor, it detects according to the transmitted or reflected light of the skin. Too little transmitted or reflected light for human tissues with different blood contents causes the change in transmittance to be almost invisible (approximately 0.6%, see human skin). Therefore, an effective raw signal is required for preprocessing. Existing optical heart rate detectors need to be worn on the wrist when used.

Contents of the invention

The object of the present invention is to propose a wireless optical electrocardiogram detector to achieve the advantages of accurate detection and high efficiency in view of the above problems.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A wireless optical electrocardiogram detector includes a photodiode, a frequency division circuit by two, an operational amplifier circuit, a monostable trigger circuit and a single-chip microcomputer circuit. , The monostable flip-flop circuit is transmitted to the single-chip microcomputer circuit.

Further, the operational amplifier circuit includes an operational amplifier, the inverting input terminal of the operational amplifier is connected in series with a resistor R5, the non-inverting input terminal of the operational amplifier is connected in parallel with a resistor R3 and a resistor R4, and the resistor R3 A capacitor C1 is connected in series, a resistor R6 is connected in series between the output terminal of the operational amplifier and the inverting input terminal, a capacitor C2 is connected in parallel with the resistor R6, and the output terminal of the operational amplifier is electrically connected to the monostable trigger through a capacitor C7. on the circuit.

Further, the single-chip microcomputer circuit includes a single-chip microcomputer, and the light-emitting diode D1 and the resistor R10 are connected in series on the output terminal RAO of the single-chip microcomputer, and the output terminal of the single-chip microcomputer is connected to a 16-pin binding post, and the resistance R11 and the resistance R12 are connected in parallel on the binding post.

Further, a resistor R2 and a light-emitting diode D2 are connected in series at the output terminal RA2 of the single-chip microcomputer, and the resistor R2 is connected in parallel with a resistor R1.

The technical solution of the present invention has the following beneficial effects:

The technical solution of the present invention uses the detection of photodiodes and uses a single-chip microcomputer to process the data, so as to accurately and simply measure the electrocardiogram. Because the circuit is relatively small, the equipment of the wireless optical electrocardiogram detector is more convenient to carry and can be used To any bare skin, such as ears and fingers, so as to achieve the purpose of accurate detection, high efficiency and easy to carry.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is the electrical circuit diagram of the wireless optical electrocardiogram detector described in the embodiment of the present invention;

Fig. 2 is an electrical circuit diagram of the filter circuit according to the embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

As shown in Figure 1, a wireless optical ECG detector includes a photodiode, a frequency-dividing circuit by two, an operational amplifier circuit, a monostable trigger circuit and a single-chip circuit, and the signal generated by the photodiode passes through the frequency-dividing circuit, The operational amplifier circuit and the monostable flip-flop circuit are transmitted to the single-chip microcomputer circuit.

Wherein the op amp circuit includes an op amp, the inverting input of the op amp is connected in series with a resistor R5, the non-inverting input of the op amp is connected in parallel with a resistor R3 and a resistor R4, and the resistor R3 is connected in series with a capacitor C1, the op amp A resistor R6 is connected in series between the output terminal of the op amp and the inverting input terminal, a capacitor C2 is connected in parallel to the resistor R6, and the output terminal of the operational amplifier is electrically connected to the monostable trigger circuit through a capacitor C7. The single-chip microcomputer circuit includes a single-chip microcomputer, and the output terminal RAO of the single-chip microcomputer is connected in series with a light-emitting diode D1 and a resistor R10. The output terminal of the single-chip microcomputer is connected to a 16-pin terminal, and the terminal is connected in parallel with a resistor R11 and a resistor R12. A resistor R2 and a light-emitting diode D2 are connected in series on the output terminal RA2 of the microcontroller, and the resistor R2 is connected in parallel with a resistor R1.

The front end of the op amp circuit can be connected in series with the filter circuit. The filter circuit is shown in Figure 2: it includes the op amp U1, the series resistor R3 between the inverting input of the op amp U1 and the ground, and the non-inverting input of the op amp U1. Capacitor C1 and capacitor C2 in series, resistor R2 in series between the non-inverting input terminal of op amp U1 and ground, resistor R1 and resistor R4 in series between the inverting input terminal of op amp U1 and node B, node B is located between capacitor C1 and capacitor Between C2.

The wireless optical ECG detector penetrates the blood and blood vessel walls through the red laser diode to form a certain weak reflection. After receiving the signal, it amplifies and expresses the heartbeat frequency through the waveform image, thereby calculating and displaying through the LED and passing through the wireless WIFI sensor. This signal is sent to a remote computer for patient monitoring reference.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. wireless optical electrocardio survey meter, it is characterized in that, comprise photodiode, frequency-halving circuit, transport and placing device circuit, monostable flipflop circuit and single chip circuit, the signal that described photodiode produces successively through frequency-halving circuit, transport and placing device circuit, monostable flipflop circuit transmission to single chip circuit.

2. wireless optical electrocardio survey meter according to claim 1, it is characterized in that, comprise transport and placing device in described transport and placing device circuit, the inverting input series resistance R5 of described transport and placing device, the in-phase input end parallel resistance R3 of described fortune transport and placing device and resistance R 4, series capacitance C1 on described resistance R 3, series resistance R6 between the outfan of described transport and placing device and inverting input, shunt capacitance C2 on described resistance R 6, the outfan of described transport and placing device is connected electrically on the monostable flipflop circuit by capacitor C 7.

3. wireless optical electrocardio survey meter according to claim 1 and 2, it is characterized in that, described single chip circuit comprises single-chip microcomputer, described single-chip microcomputer outfan RAO upper series connection light emitting diode D1 and resistance R 10, the outfan of described single-chip microcomputer connects the binding post of 16 feet, parallel resistance R11 and resistance R 12 on this binding post.

4. wireless optical electrocardio survey meter according to claim 3, is characterized in that, the upper series resistance R2 of described single-chip microcomputer outfan RA2 and light emitting diode D2, described resistance R 2 parallel resistance R1.

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