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第13届国际传热学会年报
Graham de Vahl Davis (open in a new tab) School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, NSW, Australia
Eddie Leonardi (open in a new tab) Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

SIMULATION OF CRYO-ABLATION OF THE PROSTATE BY 1, 2 AND 3 EMBEDDED CRYO-SURGICAL PROBES

page 12
DOI: 10.1615/IHTC13.p29.40
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摘要

The transient temperature field developed by simultaneously operating up to 3 cryo-surgical probes embedded in a phase-changing gel was studied numerically. The 1.5 mm OD probes were operated by a high pressure Argon gas and were placed at 5×5 mm configurations. Temperature variations at one location on the surface of the cryo-probe tips were monitored by thermocouples and were used as the boundary condition in the analysis. The freezing problem was solved numerically by ANSYS 7.0 using the enthalpy method. Frozen front propagation was found to be fastest in the radial direction. In all cases the −40°C isotherm, which is considered in the literature to be the lethal temperature for prostate cell destruction, was found to reach its maximal volume rather quickly, and was relatively small in comparison to that of the 0°C isothermal surface. In the one-, two- and three-probe applications the −40°C isotherm attained, after 30 minutes, about 3%, 3% - 6% and 3% - 8%, respectively, of the total frozen volume, depending on probe placement configurations. Results of this study should be useful in the design of probe placement and operation strategies and in understanding the limitations of the freezing-ablation process.

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