[Local hyperthermia using a device made of temperature-sensitive ferrite. The first report: temperature, output characteristics].

The basic study of intracavitary and interstitial hyperthermia was made with the Soft-Heating Method. In this method, a hybrid device composed of non-magnetic metal ring and ferrite rod is used as a heater. Being exposed to external magnetic field, the device produces heat, and its temperature rises to the Curie Temperature of the ferrite rod with self-regulation. The accuracy of the regulation is +/- 0.2 degrees C near the Curie Temperature which can be set up almost freely. In addition to that, the frequency of magnetic field is not so high (20-50 KHz) that there is no damping nor reflection of the field in a human body. Therefore the system seems to be very useful for hyperthermia of deep seated tumor. In this paper, experimental discussion of the possibility of local hyperthermia by the system is made. From the results, it is concluded that the system will be applied to clinical uses.