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Classification of surface electrodes for mid low frequency therapy Surface electrodes for mid low frequency therapy can be classified according to their shape, size, material, and other aspects. The following are several common classification methods: 1. Shape classification: The shapes of surface electrodes include sheet, circle, square, ellipse, etc. Different shapes of electrodes are suitable for different parts of treatment, such as sheet electrodes for large-area treatment, circular electrodes for local treatment, etc 2. Size classification: The size of surface electrodes is usually represented by diameter or side length. Different sizes of electrodes are suitable for different areas of treatment, such as small electrodes for local treatment and large electrodes for large-area treatment. 3. Material classification: The materials of surface electrodes mainly include metal, carbon fiber, silicone, etc. Different materials of electrodes have different conductivity and application ranges. For example, metal electrodes have good conductivity and are suitable for high-frequency therapy, while carbon fiber electrodes are suitable for low-frequency therapy, etc 4. Quantity classification: The number of surface electrodes usually includes unipolar electrodes and bipolar electrodes. Monopolar electrodes are suitable for a single treatment site, while bipolar electrodes are suitable for treatment between two treatment sites. It should be noted that selecting appropriate surface electrodes requires evaluation and selection based on the patient's condition and treatment needs, while following relevant operating procedures and safety precautions to ensure maximum treatment effectiveness.

Single-circuit negative plates are a common form of circuit negative plate, and they are integrated with conductive metal foils, which are connected to the high-frequency electrosurgical unit via a circuit. The high-frequency electrosurgical unit detects whether it is safe and compatible based on capacitance effect. When there is no negative plate in the high-frequency electrosurgical unit, the unit will sound an alarm, reminding medical staff that the negative plate is not connected. Although this single-circuit negative plate is simple, it has certain drawbacks; it can only detect whether the circuit negative plate is connected, but not whether the negative plate is connected to the skin and effective.