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Proceedings Paper

Investigations on bipolar radio-frequency current application for interstitial thermotherapy (RF-ITT)
Author(s): Kai Desinger; Gerhard J. Mueller; Thomas Stein; Johannes Tschepe
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Paper Abstract

This paper discusses the feasibility of radio-frequency current in bipolar technique for interstitial thermotherapy (rf-ITT). A short survey of established methods for interstitial tissue coagulation, e.g. the interstitial laser photocoagulation (ILP) and microwave exposure are given. In addition, a new concept for interstitial application of bipolar or quasi-bipolar radio- frequency alternating current is presented. Theoretical investigations of the electrical field distribution generated by a dipole model come together in the different mechanisms of heat generation by using radio-frequency alternating current. New concepts of bipolar or quasi- bipolar coaxial layered applicators are presented. This bipolar needle electrode enables the surgeon to use a partial and homogeneous exposure of radio-frequency current for interstitial thermotherapy, e.g. for the treatment of BPH or for concha coagulation in ENT. Less power is needed due to the limited current exposition at the immediate operation site and a highly safe procedure is possible. Therefore, to determine the thermal damage of tissue, depending on the rf parameters, a computer model for a real-time simulation of the spatial electrical field distribution especially for a multiple probe application is currently being developed. This is an appropriate tool for dosimetry. A similar program for LITT, called LITCIT, developed at the Laser-Medizin-Zentrum Berlin has already shown its efficiency in clinical use. Furthermore the feasibility of a 'cross-over' applicator is discussed which combines ILP and rf-application by using metallized optical fibers for a simultaneous application of electrical energy and laser radiation.

Paper Details

Date Published: 19 January 1996
PDF: 11 pages
Proc. SPIE 2623, Medical Applications of Lasers III, (19 January 1996); doi: 10.1117/12.230340
Show Author Affiliations
Kai Desinger, Laser- und Medizin-Technolgie gGmbH (Germany)
Gerhard J. Mueller, Laser- und Medizin-Technolgie gGmbH (Germany)
Thomas Stein, Laser- und Medizin-Technolgie gGmbH (Germany)
Johannes Tschepe, Laser- und Medizin-Technolgie gGmbH (Germany)

Published in SPIE Proceedings Vol. 2623:
Medical Applications of Lasers III
Stephen G. Bown; Herbert J. Geschwind M.D.; Raimund Hibst; Frederic Laffitte; Giulio Maira; Roberto Pini; Hans-Dieter Reidenbach; Hans H. Scherer M.D.; Pasquale Spinelli, Editor(s)

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