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ElectroComponent Science and Technology
Volume 1 (1974), Issue 2, Pages 91-96

Indirect Heating Source for Treatment of Malignant Brain Tumours

1Department of Electrical Engineering, University of Pittsburgh, Pittsburgh 15261, Pennsylvania, USA
2Department of Neurosurgery, School of Medicine, University of Pittsburgh Laboratory of Surgical Research, Montefiore Hospital, Pittsburgh 15213, Pennsylvania, USA

Received 20 March 1974

Copyright © 1974 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The design of an indirect heating source for the treatment of malignant brain tumors is presented. A high Q resonant tank working at 25 kHz generates a magnetic field of 16,000 ampere-turn/meter (peak) which is used to heat metallic implants by a combination of hysteresis and induced current heating. The resonant tank is used in a feedback loop of the power driver to maintain the driver at the resonant frequency, thus minimizing the power losses that inevitably occur in open loop systems due to reference oscillator drifts and/or varying load and tank conditions. Because of the high field strengths required and the relatively small power dissipation that occurs in the metallic implants, the overall system design differs substantially from standard induction heating applications.