Signal amplifier for portable detection system of electroretinogram (ERG)

Abstract

The invention provides a signal amplifier for a portable detection system of the electroretinogram (ERG). The signal amplifier comprises two gain adjusting knobs, a built-in signal amplification circuit, two measuring electrode magnetic interfaces, a reference electrode, as well as a common reference electrode interface, two measuring electrodes and two output plugs, wherein the two measuring electrode magnetic interfaces are arranged at the input end of the signal amplifier, the reference electrode is connected to the signal amplifier through one reference electrode magnetic interface, the main body part of the signal amplifier is J-shaped, the end, connected with the measuring electrodes, of the main body part of the signal amplifier is bent, due to the adoption of the novel design, the measuring accuracy and simplicity are greatly improved, and the cost is also extremely low.

Description

[0001] [technical field] [0002] The invention relates to the field of ophthalmic medical technology, in particular to a signal amplifier for a portable electroretinogram (ERG) detection system. [0003] [Background technique] [0004] Electroretinogram (ERG) has been used clinically for 40 years since Karpe (1945). It is a guide electrode that is in contact with the cornea, and another larger reference electrode, also known as the ground electrode, is placed on the forehead When the retina is stimulated with light, the total electrical response of the retina recorded by the retinal electrodes from the cornea or corresponding parts can be recorded on the oscilloscope of the detection equipment to record a series of visual electrical changes, namely electroretinogram (ERG). According to different stimulation conditions, there are flash ERG, local ERG and multifocal ERG. Electroretinogram is often used to effectively detect retinal ganglion cell diseases such as fundus disease,...

AI Technical Summary

Problems solved by technology

[0018] The test method of electroretinogram has not been updated in recent years. All the electrodes are passively connected to the preamplifier, that is, the wires from the electrodes are directly connected to the detection equipment without pre-processing the signal.

Moreover, the whole set of equipment is very complicated, and it is not very convenient to operate.

Reasonable wire material and wire length were not selected for the wire. The wire between the electrode and the device is too long, which is greatly affected by the space magnetic field, and the wire is not shielded. Although the signal amplifier can still process the electrical signal to a certain extent, it will cause The ERG electrogram waveform cannot be well identified and analyzed in digital processing, and the judgment of the patient's eye disease is not accurate enough

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