Signal anti-interference circuit of electrocardiograph

Abstract

The invention discloses a signal anti-interference circuit for an electrocardiograph, which includes a high-frequency component increasing circuit, an amplifying circuit and a feedback stabilization circuit. The composite circuit composed of Q2, sliding rheostat RW1, and sliding rheostat RW2 increases the high-frequency component of the signal. The amplifier circuit uses the operational amplifier AR1 to amplify the signal output by the high-frequency component increasing circuit, and the feedback stabilization circuit receives the signal output by the amplifier circuit. The signal is stabilized by using triode Q3, triode Q4, Zener diode ZD1 and capacitor C5 to form a voltage stabilizing circuit. At the same time, the operational amplifier AR2 and triode Q5 are designed to feedback and stabilize the voltage, which is input into the control terminal of the electrocardiograph. Effectively improve the anti-interference of electrocardiograph signal.

Description

technical field [0001] The invention relates to the technical field of electrocardiographs, in particular to a signal anti-interference circuit of the electrocardiograph. Background technique [0002] The electrocardiogram function can automatically record the bioelectrical signal (cardiac signal) generated by the myocardial excitement when the heart is active, and is a medical electronic instrument commonly used in clinical diagnosis and scientific research. [0003] Before the heart beats, the myocardium is first excited, and a weak electric current is generated during the exciting process, and the electric current is conducted to various parts through the human body tissue. Due to the different tissues of different parts of the body and the different distances between each part and the heart, various parts of the human body surface show different potential changes. The relationship between the surface potential and time generated by the electrical activity in the human he...

AI Technical Summary

Problems solved by technology

Due to the different tissues of different parts of the body and the different distances between each part and the heart, various parts of the human body surface show different potential changes. The relationship between the surface potential and time generated by the electrical activity in the human heart is called Electrocardiogram, electrocardiogram machine is an instrument for recording these physiological electrical signals. However, in the case of various electronic devices emerging in an endless stream, the potential signal of the lead wire of the electrocardiogram machine is sometimes interfered. Mistakes can even lead doctors to misdiagnose a patient's condition

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