High frequency electric knife is to use the high frequency and high voltage current generated by the high frequency oscillation circuit in the machine to the patient site through the knife pen, using the tip of the knife pen to instantly burn the contact tissue phenomenon, in order to achieve the effect of electrocutting or electrocoagulation.
The difference between electrocutting and electrocoagulation lies in the difference of high-frequency current waveform: electrocutting is continuous high-frequency waveform, current instantly generates a large amount of heat and high temperature, the temperature to vaporize the cell tissue to make the tissue separation, electrocutting voltage is low but the waveform dense energy is high, and electrocoagulation is intermittent pulse form, instantaneous generated less heat, low temperature, not enough to make tissue vaporization and only produce scald effect, electrocoagulation energy is low but high voltage. The mixed-cut waveform is somewhere in between.
High frequency electric knife action to the human body current, must flow through the loop back to high frequency electric knife, form a complete loop, to complete electrocutting or electrocoagulation function, single pole electric knife is through the negative plate to make the current flow back to the electric knife loop, and bipolar electric knife without negative plate, because his bipolar tweezers a head for the output, another head to make the current back to the electric knife, is equivalent to the role of the negative plate. High-frequency electric knife mainly includes: spark gap type electric knife, electronic tube oscillatory type electric knife, transistor oscillating type electric knife and microcomputer control crystal vibration electric knife. Now is widely used is microcomputer control crystal vibration electric knife.
