Double Pancake Exciting Coils with Back Yoke for Magnetics Field Generator to Medical Treatment

Abstract

　Induction heating type hyperthermia treatment, as one of cancer therapies, needs both high magnetic fields (> 2 mT) and a few hundred kHz inside of a body. We proposed the double-pancake type coil system sandwiching human body. The proposed exciting coils can generate magnetic fields with both magnitude and frequency required to a medical treatment, and also can adjust the distance between two flat coils according to the bodily proportions of a patient. In order to make magnetic fields inside a body further increase, a back yoke as magnetic materials is added to both coils. The paper discussed magnetic- and electrical-circuit characteristics of the exciting coil with a back yoke.