Where does the majority of heating occur on the dispersive electrode during an electro-surgical procedure?

The majority of heating during an electro-surgical procedure occurs at the leading edge of the dispersive electrode. This principle is based on the mechanics of how current flows through tissues and the electrode during the surgical process. When the electro-surgical generator operates, the electrical current exits through the leading edge to effectively complete the circuit, which leads to greater concentration of energy flow and subsequently more heat generation in that area.

As the current flows, it encounters the tissue at the leading edge first, where it can cause the most immediate interaction and impedance, resulting in an increased thermal effect. In contrast, areas further away, such as the trailing edge or the middle of the electrode, do not experience the same level of current concentration, leading to less heat being generated there. This differential heating is crucial for the effectiveness of the electro-surgical device and the safety of the procedure, as it ensures precise control of tissue effects during cutting or coagulation.