It's challenging to provide an exact number of physiotherapy hydrogels because the field is continually evolving, with researchers developing new formulations and applications.

Classified by conductive types

Liquid electrode:   liquid medium has a strong penetration and wetting effect on the skin, can provide very fast and stable ECG waveform; The liquid electrode is suitable for ecg diagnosis and monitoring of dry, rough, hairy people and low temperature environment.

Super quality hydrogels require a variety of properties to ensure their effectiveness, safety and comfort in electrotherapy, hyperthermia or other therapeutic applications.  When selecting the hydrogel suitable for making the physiotherapy electrode, it is necessary to consider its conductivity, adhesion, biocompatibility, durability and other characteristics

The  thickness of the tin layer in AED (Automated External Defibrillator) pads can significantly impact their performance, conductivity, durability, and patient safety. 

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Electrosurgical Unit (ESU) along with various electrodes to cut tissue, coagulate blood vessels, or perform other surgical functions using high-frequency electrical currents .

The difference between hydrogel and ECG hydrogel lies in their composition, design, and application

What's the AgCl hydrogel ?  Where do you use it ? 

AgCl hydrogel refers to a specialized material that combines silver/silver chloride (Ag/AgCl) with a hydrogel matrix. This material is commonly used in biomedical applications, especially in biopotential electrode systems such as ECG, EEG, and EMG.