Utilization of High Frequency Electrical Signal for Biological Tissue Ablation

Possibility of high frequency electrical signal utilization for biological tissue ablation is considered. High frequency generator with fixed frequency of 13.56 MHz designed by the authors was used in experiments. HF generator made it possible to use needle irradiator (made of medical steel) avoiding necessity to use closed electrical loop. Piece of a pig skin was used as a biopsy slice. Processes of burning out, resection, and coagulation were conducted. It was shown that during HF ablation the tissue heats up to 120°C. To measure the temperature in the focus of action multimeter CEM DT-898 (made in FRG) with thermovision function was used. The multimeter ensured area monitoring with maximum temperature at the point of discharge occurring when the antenna was approaching the skin, the discharge also heated the skin to temperatures enough for thermal ablation. It was found that HF ablation does not affect tissue located near the focus of action. This conclusion was deduced from the dependence of skin electrical resistance on the distance from the cut after HFA. Based on the results it is recommended to use HF generators for biological tissue ablation.