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Article

Анализ методов и устройств для трансуретральной микроволновой термотерапии биотканей

Елизаров А. А., Шаймарданов Р. В.

Now the electronic devices based on slow wave systems and electromagnetic waves excited in them were widely adopted in microwave electronics. They are also successfully applied at creation new elements of radio-frequency and microwave paths, instrumentations and devices, materials electromagnetic heating and etc. One of the perspective directions of slow wave systems usage is possibility of their implementation in biology and medicine as antennas and radiators for radio-frequency and microwave physical therapy, a radio-thermy and a tomography, sensitive elements for medical diagnostics, devices for sterilization and heat treatment. Advantages of usage slow wave systems in biology and medicine are based on electrodynamic and design features of structures which follow from distribution of an electromagnetic field near their surfaces. In this we are looking for features of usage slow wave systems in relation to area with high value of dielectric permeability, in particular to biofabrics, and also the problems connected with creation of electrodes for intracavitary microwave physical therapy on slow wave systems with primary concentration of electric field in biofabrics, adjacent to electrode surface. In this work the results of modeling microwave radiator on the basis of a ribbed coaxial line were received on Ansoft HFSS v.12 and CST Microwave Studio 2011 software. The theoretical ratios whice were received as a result of the electrodynamic analysis allow to calculate change of phase speed of slowed-down electromagnetic wave in the coaxial line with ridge conductors and are in good compliance with results of physical experiment. Application of such structure represents practical interest as allows to reduce its longitudinal geometrical sizes with preservation of electric wavelength. Except urological procedures of transurethral microwave thermotherapy, the offered electrode on the basis of a ribbed line can be used also as a radiation source for the microwave tomograph at research of large blood vessels or a gullet. Besides, its application as the tiny reception antenna at radiometry and a termografiya is possible.