电刀已广泛应用在耳鼻喉头颈外科。电流依赖电磁波来作切割或凝固或同时切割凝固，只有当电刀头和组织间有足够的电压，才能切割。当电流集中到组织的一小点时，组织温度快速升高，水分蒸发，蒸气引起细胞破裂，由此把组织分离。另一方面，在两个弦波间有一段较长的间歇期... Electric knife has been widely used in ENT head and neck surgery. Current depends on electromagnetic waves for cutting or solidification or simultaneous coagulation. Only when there is sufficient voltage between the tip and the tissue can the current be cut. When the current is concentrated to a small point in the tissue, the temperature of the tissue rises rapidly, the water evaporates and the vapor causes the cells to rupture, thereby separating the tissue. On the other hand, there is a long period between two strings.