Recorder is the recording device of Electrocardiograph. For the analog ECG machine, the early use of the recorder is the disk spring for the back 0 torque of the dynamic loop recorder, the 90 's after the use of position feedback recorder. For digital electrocardiograph, the recorder is a heat-sensitive or dot-matrix printer.
1. Dynamic Coil Recorder: The structure principle of the movable coil recorder is a fixed magnetic circuit and a rotatable coil composed of a magnetic steel. The output signal of the ECG power amplifier is added to the coil of the recorder, and a record pen is fixed on the coil. The power amplifier outputs a current to the coil and the coil rotates when the signal output is intentional. When the deflection angle of the coil is at the same time as the back 0 moment of the disk spring, the deflection is stopped. In this way, the coil-driven recording pen records the ECG waveform on the record paper.
2, Position feedback Recorder: Position feedback recorder is a kind of recorder without mechanical back to 0 spring, special electronic circuit can play the role of 0 springs back. When the machine loses power, the recording pen of the position feedback recorder can be arbitrarily struck.
3, lattice heat-sensitive recorder: heat-sensitive recorder is the use of heated sintering on the ceramic substrate on the semiconductor plus hot spots, in the heat-colored heat-sensitive paper to iron out graphics and characters.