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Proceedings Paper

RF nonablative cutaneous thermal therapy
Author(s): James William Tunnell; Roger A. Stern; Karl A. Pope
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Paper Abstract

We investigate a novel design of a cryogen-cooled capacitive RF treatment tip (Thermage) designed to volumetrically heat skin while preserving the epidermis. Cryogen R-134a (1,1,1,2-tretrafluoroethane), an environmentally compatible, non-toxic, FDA-approved freon substitute, is sprayed on the back of the treatment tip to induce conductive cooling to the skin surface. The treatment tip is driven by an RF generator at 6 MHz with a typical dosage of 95 J delivered over 2 sec. The purpose of this study was to predict the temperature profiles within human skin due to the RF heating and cryogen cooling through the use of a three-dimensional mathematical model of the temperature distribution within human skin. RF cunent density was determined by measuring the potential field in skin-like saline solution with a custom 3D field mapping system. The three-dimensional bioheat equation was solved using the central finite-difference approximation. Results of this study show that this electrode design induces volumetric heating deep within the skin while still protecting the superficial skin layers from thermal injury. This combination of RF heating and surface cooling may prove beneficial for non-ablative cutaneous thermal therapies.

Paper Details

Date Published: 17 June 2002
PDF: 8 pages
Proc. SPIE 4609, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XII, (17 June 2002); doi: 10.1117/12.432073
Show Author Affiliations
James William Tunnell
Roger A. Stern
Karl A. Pope

Published in SPIE Proceedings Vol. 4609:
Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XII
Lawrence S. Bass M.D.; Eugene A. Trowers M.D.; Kenneth Eugene Bartels D.V.M.; Udayan K. Shah M.D.; David S. Robinson M.D.; Lawrence S. Bass M.D.; Kenton W. Gregory M.D.; Kenneth Eugene Bartels D.V.M.; Lawrence S. Bass M.D.; Brian Jet-Fei Wong M.D.; Hans-Dieter Reidenbach; Lloyd P. Tate V.D.M.; Nikiforos Kollias; Abraham Katzir; Timothy A. Woodward M.D.; Werner T.W. de Riese; George M. Peavy D.V.M.; Werner T.W. de Riese; Kenton W. Gregory M.D.; Michael D. Lucroy D.V.M.; Abraham Katzir; Nikiforos Kollias; Michael D. Lucroy D.V.M.; Reza S. Malek M.D.; George M. Peavy; Hans-Dieter Reidenbach; David S. Robinson M.D.; Udayan K. Shah M.D.; Lloyd P. Tate V.D.M.; Eugene A. Trowers M.D.; Brian Jet-Fei Wong M.D.; Timothy A. Woodward M.D., Editor(s)

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