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Author Wagenpfeil, J. ♦ Schollig, C. ♦ Mayer, V. ♦ Nold, B. ♦ Ederer, M. ♦ Neugebauer, A. ♦ Rothmund, R. ♦ Kramer, B. ♦ Schwentner, C. ♦ Schenk, M. ♦ Wallwiener, D. ♦ Stenzl, A. ♦ Enderle, M. ♦ Sawodny, O. ♦ Feuer, R.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2015
Language English
Subject Domain (in DDC) Technology ♦ Medicine & health ♦ Engineering & allied operations
Subject Keyword Coagulation ♦ Electrodes ♦ Mathematical model ♦ Temperature measurement ♦ Instruments ♦ Conductivity ♦ Iron
Abstract Radiofrequency-induced thermofusion is a frequently used electrosurgical procedure for the sealing of blood vessels. A disadvantage of vessel sealing instruments is that the generated thermal energy spreads to the surrounding tissue and may irreversibly damage it. This is particularly problematic when operating close to sensitive structures such as nerves. Given their advantages, there is nonetheless a lot of interest in using bipolar vessel sealing for surgical procedures. To select instruments that may be safely used in such cases, it is important to reliably quantify the thermal spread to the surrounding tissue. Mathematical models can help to evaluate the transient behavior, that is the evolution of the thermal spread over time, more precisely. A finite element model allows for a detailed analysis of inhomogeneities in the spatial temperature distribution. As a first step towards a finite model of the bipolar vessel sealing process, a model of the coagulation of chicken egg white is presented here. Egg white has thermal and electrical properties that are very similar to tissue, making it suitable as a substitute for the analysis of the coagulation process. It has the additional advantage, that the spatial and temporal evolution of the thermal spread can be visually gauged. The presented model describes the experimentally observed spatial temperature distribution, the shape of the coagulated egg white, and the formation of hotspots. Furthermore, it is shown that the model can correctly predict the shape of the coagulated egg white in further experiments.
Description Author affiliation: ERBE Elektromedizin GmbH, Tübingen, Germany (Mayer, V.; Nold, B.; Ederer, M.; Neugebauer, A.; Enderle, M.) || Univ. Hosp. Tubingen, Tubingen, Germany (Rothmund, R.; Kramer, B.; Schwentner, C.; Schenk, M.; Wallwiener, D.; Stenzl, A.) || Inst. for Syst. Dynamics, Univ. of Stuttgart, Stuttgart, Germany (Wagenpfeil, J.; Schollig, C.; Sawodny, O.; Feuer, R.)
ISSN 1557170X
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2015-08-25
Publisher Place Italy
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
e-ISBN 9781424492718
Size (in Bytes) 4.01 MB
Page Count 6
Starting Page 5791
Ending Page 5796

Source: IEEE Xplore Digital Library