Thermomechanics of electrosurgical procedures
Authors
Karaki, Wafaa
ORCID
Loading...
Other Contributors
Borca-Tasçiuc, Diana-Andra
De, Suvranu
Borca-Tasçiuc, Theodorian
Wang, Ge, 1957-
De, Suvranu
Borca-Tasçiuc, Theodorian
Wang, Ge, 1957-
Issue Date
2018-12
Keywords
Mechanical engineering
Degree
PhD
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
Abstract
Starting with Pennes’ bioheat transfer equation to model the temperature profiles observed during ex vivo experiments, we show that the apparent specific heat of the tissue increases significantly at 100°C, highlighting the important role latent heat loss plays in energy dissipation. A proposed two-scale model that couples evaporation at the microscale with energy conservation at the macroscale is able to capture evaporation losses at 100°C and prevent further temperature increase. However, to account for the coupled effects of phase change of water in the intra- and extracellular spaces to vapor, vapor transport, and mechanical deformation, a more comprehensive thermo-mechanical model based on continuum mixture theory is proposed to accurately predict temperature in in vivo and ex vivo experiments on porcine liver tissue. We highlight the effect of applied power on tissue cutting and coagulation damage by coupling this model to an Arrhenius damage model to capture dynamic tissue heating during in situ electrosurgical cutting. The mixture model is coupled to a multi-frequency model to quantify the effect of frequency-dependent electrical properties on the rate of energy generation during ex vivo and in vivo electrosurgical tissue heating with multi-frequency power modes.
Description
December 2018
School of Engineering
School of Engineering
Department
Dept. of Mechanical, Aerospace, and Nuclear Engineering
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection
Access
Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.