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Proceedings Paper

Radio-frequency current application in bipolar technique for interstitial thermotherapy (rf-ITT)
Author(s): Kai Desinger; Thomas Stein; Gerhard J. Mueller
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Paper Abstract

For the interstitial treatment of pathologic tissue, e.g. tumors, the benign prostate hyperplasia or the concha hyperplasia in otorhinolaryngology, the method of interstitial laser photocoagulation and the monopolar RF- needle coagulation can be used as well as other methods, e.g. the microwave exposure, alcohol injection, ultrasound or hot water irrigation. This article will present latest results of interstitial thermotherapy with radio-frequency alternating current in bipolar technique. Therefore basic investigations of the thermal field distribution in in vitro samples were performed. THe efficiency of the developed applicators were examined using egg white and in in vitro experiments with porcine liver tissue. Bipolar needles with different diameters were built and tested. Carbonization and dehydration can be avoided by irrigation of the tissue during treatment through an integrated central flushing port. A bipolar needle has been developed for the treatment of concha hyperplasia which can be used as the monopolar pendant with similar results in partial tissue coagulation but without current flow in the sensitive head region. First pathologic investigations pointed out that with the use of the bipolar technique the surface of the concha with the ciliary epithelium is less affected due tot he limited spatial current distribution. Furthermore the design of a multi-electrode needle is presented which could probably offer an additional increase of safety and a simplification of performing a concha coagulation procedure. The new design of a bipolar needle electrode enables the surgeon the use of a partial application of radio frequency current for ITT. Less power is needed due to the limited current distribution at the immediate operation site, which means that a neutral electrode is not needed. Thus a highly safe procedure can be performed by the surgeon.

Paper Details

Date Published: 3 December 1996
PDF: 11 pages
Proc. SPIE 2922, Laser Applications in Medicine and Dentistry, (3 December 1996); doi: 10.1117/12.260688
Show Author Affiliations
Kai Desinger, Laser-und Medizin-Technologie gGmbH (Germany)
Thomas Stein, Institut fuer Medizinische/Technische Physik und Lasermedizin/Freie Univ. Berlin (Germany)
Gerhard J. Mueller, Laser- und Medizin-Technologie gGmbH and Institut fuer Medizinische/Technische Physik und (Germany)

Published in SPIE Proceedings Vol. 2922:
Laser Applications in Medicine and Dentistry
Gregory B. Altshuler; Fausto Chiesa; Herbert J. Geschwind; Raimund Hibst; Neville Krasner; Frederic Laffitte; Giulio Maira; Reinhard Neumann; Roberto Pini; Hans-Dieter Reidenbach; Andre Roggan; Montserrat Serra I Mila, Editor(s)

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