期刊
INTERNATIONAL JOURNAL FOR MULTISCALE COMPUTATIONAL ENGINEERING
卷 20, 期 6, 页码 79-87出版社
BEGELL HOUSE INC
关键词
electrosurgery; telegraph equation; shock wave; Mach wedge
资金
- National Institutes of Health [R01EB029766]
This study simulates the heat conduction and motion of heat sources in electrosurgery using finite differencing in a two-dimensional setting. It finds that the motion of the heat source is supersonic and leads to multiscale phenomena such as shock waves, Mach wedges, and high-temperature concentrations.
Electrosurgery aimed at the removal of tumors results in highly transient heat conduction. Simulations of temperature fields, under the assumption that heat in soft tissue organs is governed by a telegraph (damped hyperbolic) equation, are conducted in a two-dimensional setting with finite differencing in space and time. Six trajectories of a heat source motion are simulated: along a two-phase interface, along the latter with an offset, normal to a two-phase interface, on a curved (sine function) path in a single phase, along a circular path in a single phase, and along the latter around inclusion of one type in a matrix of another type. With the surgeon's hand motion velocity roughly the order of magnitude greater than the velocity of the heat propagation in the tissue, the heat source motion is supersonic, giving rise to the multiscale phenomena-evolving shock waves, Mach wedges, and high-temperature concentrations.
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