High-frequency electric knife is composed of host and electric knife holder, patient plate, bipolar cassette, foot switch and other accessories.
High frequency electric knife has two main working modes: unipolar and bipolar.
1, unipolar mode
In the unipolar mode, the tissue is cut and coagulated using a complete circuit consisting of a high-frequency generator in the high-frequency knife, a patient plate, successive leads and electrodes. In most applications, current passes through the patient through the effective wire and electrode, and the patient plate and its leads return to the generator of the electrosurgical knife.
The heating effect of a high-frequency knife that can destroy diseased tissue is not caused by the heating electrode or the cutter head, like an electric cautery. It gathers high-frequency currents of high-frequency currents and directly destroys tissues that are in contact with the tip of the active electrode. Coagulation occurs when the temperature of a tissue or cell that is in contact with or adjacent to an effective electrode rises to denature the protein in the cell. This precise surgical effect is caused by the waveform, voltage, current, type of tissue, and electrode Shape and size to decide.
To avoid continuing to heat the tissue and causing burns to the patient while the current is away from the patient returning to the high-frequency knife, the patient plate in the monopolar device must have a relatively large area in contact with the patient to provide a low impedance and low current density channel . Some electrosurgical knives used in doctors' clinics have small currents and low densities and do not require patient plates. However, most general purpose electrosurgical knives use larger currents and require patient plates.
The output system isolated from the ground makes the electric current of the high frequency electric knife no longer need the auxiliary channel between the patient and the earth, thereby reducing the risk that the body that may be in contact with the grounding object is burned. Using a ground-based system, the risk of burns is greater than that of an insulated output system.
2, bipolar mode
Bipolar coagulation provides high-frequency electric energy to the body tissue through the two tips of the bipolar forceps, so that the blood vessels between the two ends of the bipolar forceps are dehydrated and coagulated to achieve hemostasis. Its scope of action is limited to the tweezer between the two ends, the degree of damage to the body tissue and the scope of influence is much smaller than the unipolar approach, suitable for the closure of small blood vessels (diameter <4mm) and fallopian tubes. Therefore, bipolar coagulation is mostly used in more delicate surgery such as brain surgery, microsurgery, ENT, obstetrics and gynecology, and hand surgery. The safety of bipolar coagulation is gradually being recognized by people and its use is gradually expanding.
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