Local Inductive Heating Method Using Novel High-Temperature Implant for Thermal Treatment of Luminal Organs

The authors have previously proposed both a regional heating system, which introduced auxiliary electrodes, and a local inductive heating system, which introduced high-temperature-rise implants. In this paper, we present two novel types of high-temperaturerise implants aiming at luminal organ treatments, namely, a coaxial needle and a stent. Since hot-spot generation may degrade the accuracy of temperature measurements when developing these inductive heating implants, a simple method using a high-conductivity eddy-current absorber such as an aluminum foil is proposed. This is suggested based on theoretical investigations using the 3-D finite-element method and experiments. The heating tests of the novel folding-type implants suggested by medical doctors were conducted at a frequency of 4.0 MHz and an output power of 500 W using the proposed EC A. It was found that in the case of the coaxial-needle-type implant, a high temperature rise of more than 60 omicronC can be achieved.