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In this study, the endoscopic modality of microwave hyperthermia for bile duct carcinoma by use of the proposed biliary stent fed by a thin coaxial probe was described. As the results of investigations, we confirmed that the proposed stent is able to heat around it effectively. Therefore, it is highly possible that it is useful for microwave hyperthermia in situation that it has implanted in a bile duct. As further study, we intend to optimize the structure of the biliary stent in order to control heating regions and do the animal experiment to investigate its usefulness under the blood flow.