Embedded system controlling microwave generators in hyperthermia and diathermy medical devices

Microwave Hyperthermia (MH) is a medical procedure of rising the human body tissue temperature between 41.5C and 45C using electromagnetic radiation and maintaining the desired temperature during the treatment period. In this paper we present a part of our embedded system that can drive a continuous wave (CW) 2450 MHz magnetron as well as a 915 MHz RF power generator for pulse-modulated waves operating mode, measuring and managing the patient's skin temperature feedback. This embedded system is intended for use in microwave hyper-thermia or microwave diathermy devices, with non-invasive regional or interstitial applicators. Our paper is structured in four chapters. The “Introduction” is briefly presenting the microwave hyperthermia essentials: microwave propagation, penetration depth, SAR and microwave heating mechanism. The “Design configuration” part presents the structure of our hyperthermia device with basic microwave generators and auxiliary equipment used for thermal management. The “Embedded design” chapter presents, in two subsections entitled “Hardware” and “Software”, the principles used for controlling the microwave generators together with the implemented solution and the essential aspects of our firmware as program flow. In “Conclusions”, preliminary results are analyzed in agreement with the IEC60601 standards and with the requested directions for further developments.