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.

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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.

In high frequency (HF) surgery, the neutral electrode (otherwise known as the return electrode, ground pad) is critical in unipolar applications because it closes the circuit between the patient and the radio frequency (RF) generator. Here are the reasons why neutral electrodes are essential in unipolar electrosurgery, and the key points to consider when placing them 

The main goals and basic principles of postpartum pelvic floor muscle rehabilitation are to improve the contraction ability of pelvic floor muscle, prevent and treat PFD, and improve the quality of sexual life. In 1940, Dr. Arnold Kegal proposed the Kegal exercise to strengthen the pelvic floor muscles and reduce the incidence of urinary incontinence. On this basis, supplemented by biofeedback technology, electrical stimulation and other technologies, the pelvic floor rehabilitation treatment has greatly improved the therapeutic effect.