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Proceedings Paper

Finite-element model for endometrial ablation systems
Author(s): Thomas P. Ryan; Robert C. Platt; Stanley Humphries Jr.
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Paper Abstract

Ablation of the endometrium has become a viable treatment for dysfunctional bleeding of the uterus in women. Surgical applications of thermal ablation utilized a rolling electrode to ablate the inner uterine lining, but required practiced surgical skills and made it difficult to assess subsurface damage. Recently, various energy systems have been applied to the endometrium such as lasers, microwaves, RF electrodes, hot water balloons, and cryotherapy. A finite element model is presented to compare a multi-electrode, multiplexed RF device with a balloon containing hot fluid. The temperature fields in the uterine wall are plotted over time for various blood flow values. Assumptions of constant electrical conductivity are compared to temperature- dependent electrical conductivity. Temperatures are shown to be a maximum of about 10 - 20 degree(s)C higher when varying electrical conductivity is used. Results are also shown for cases with a 2 mm blood vessel in the field and how each device adjusts its operation to compensate for this heat sink. Damage integral results will be shown according to the time and temperature of the treatments.

Paper Details

Date Published: 2 April 1998
PDF: 11 pages
Proc. SPIE 3249, Surgical Applications of Energy, (2 April 1998); doi: 10.1117/12.304344
Show Author Affiliations
Thomas P. Ryan, Valleylab Inc. (United States)
Robert C. Platt, Valleylab Inc. (United States)
Stanley Humphries Jr., Field Precision (United States)

Published in SPIE Proceedings Vol. 3249:
Surgical Applications of Energy
Thomas P. Ryan, Editor(s)

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