VLF or LF induction heating method for hyperthermia has the advantage of facility of localization of heated zone, simplicity of temperature measurement via thermocouples, and low cost of the apparatus. One drawback of this method is that conductive heat generated by a heating-pad alone is not enough to heat deep tumors.
In this paper, to solve this problem, we present a VLF heating method with needle implantation by the use of magnetic stainless steel needles. By this method, we can maintain a temperature range of 4348°C to 30 mm depth on phantom tests. Some clinical tests have been done successfully for treatment of oral malignancy.
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