The working principle and advantages of high frequency electric knife

The high-frequency electrosurgical knife uses the high-frequency and high-voltage current generated by the high-frequency oscillation circuit in the host to act on the patient's part through the knife pen, and the tip of the knife pen is used to produce instantaneous cauterization on the contacted tissue to achieve the effect of electrocutting or electrocoagulation. The difference between electrocutting and electrocoagulation lies in the high-frequency current waveform: the current waveform of the electrocutting is a continuous high-frequency waveform, and the current generates a lot of heat and extremely high temperature in an instant. This temperature vaporizes the cell tissue and makes the tissue Separate, the voltage of the electrocutting is low but the waveform is dense and the energy is high; while the electrocoagulation is an intermittent pulse type high-frequency waveform, the instantaneous heat generation is low, the temperature is low, and it is not enough to vaporize the tissue and only produce the effect of scalding. The energy is low but the voltage is high. The mixed cut waveform is somewhere in between. The current that the high-frequency electric knife acts on the human body must flow back into the high-frequency electric knife through a loop to form a complete circuit to complete the electric cutting or electrocoagulation function. The unipolar electric knife uses the negative plate to make the current flow back to the electric knife to form a loop , And the use of bipolar coagulation tweezers does not need a negative plate, because one of its bipolar tweezers is the output circuit, and the other end makes the current return to the electric knife, which is equivalent to the role of the negative plate.

Advantages of using high frequency electrosurgical unit:
1. The cutting speed is fast, the hemostatic effect is good, the incision is neat, the operation is simple, safe and convenient.
2. Compared with the traditional mechanical scalpel, the clinical use of high-frequency electrosurgical scalpel can greatly shorten the operation time, reduce the patient's blood loss and blood transfusion, thereby reducing complications and surgical costs.
3. Compared with other electrosurgical instruments (such as laser knives, microwave knives, ultrasonic knives, water knives, semiconductor thermocoagulation knives, etc.), high-frequency electrosurgical knives are suitable for a wide range of operations, easy to enter the surgical site, simple operation, cost-effective consumables and host high.