The high frequency currents can pass through human body safely without neuromuscular stimulation. Electrosurgery is a technique that uses high frequency current effects on biologic tissues for cutting and coagulation.
The target of this project is designing and implementing of a high frequency electrosurgery unit and research on its theory. At first, the physical and practical fundaments of electrosurgery, making use of biological effects of high frequency currents in surgery, effects of different parameters on cutting and coagulation quality, and current techniques of electrosurgery, are argued.
We describe activities on modeling of human body and solution of dominant differential equations, by means of computer and numerical methods, after defining tissue electromagnetic properties. The results of this modeling are: estimation of current and potential distribution in body tissues, calculation of thermal power absorption in tissues, estimation of body impedance model and study on probable sequels or electrosurgery and their reduction techniques.
A new technique used in implementing the electrosurgery unit based on high frequency switching is presented in detail, and is compared with other techniques.
Digital control system of the unit, in order to automatic and optimum control of coagulation process, and probable dangers; and produce other capabilities are described.
In attention to safety importance in medical electrical equipment, standard experiments are described.
Subjects in electromagnetic compatibility and noise reduction techniques, are introduced, in attention to output power and frequency of unit.
Summary of most important results and suggestions for further research are presented in conclusion.