A microwave surface applicator for tissue coagulation: Technical characteristics and performances

B Lepers, Peter Clegg, Nigel Cronin, Ines Wieland

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This work describes the mechanical and the electromagnetic design of a microwave surface applicator used to coagulate liver tissue in the treatment of hepatic tumors. A good prediction of the ratio between reflected and forward microwave power (return loss) is obtained with a finite element model using commercial software. Laboratory testing of the applicator performed in polyacrylamide gel (PAG) and in ex vivo bovine liver show a hemispherical heat distribution pattern and hemispherical ablations up to 20 mm in diameter and 15 mm in depth in a controlled manner in 1 min. The applicator can also be used to coagulate larger areas of tissue with 2-5 mm depth by moving the applicator on the surface of the tissue. Experimental results indicate that the coagulated volume of tissue is approximately proportional to the energy delivered into ex vivo bovine liver, hemispherical in shape, obtained in short time duration with a volumetric rate of coagulated tissue of about 50 mm3/s.
Original languageEnglish
Article number014502
JournalJournal of Medical Devices: Transactions of the ASME
Volume6
Issue number1
DOIs
Publication statusPublished - 2012

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Applicators
Microwaves
Coagulation
Tissue
Liver
Electromagnetic Phenomena
Ablation
Polyacrylates
Tumors
Software
Gels
Hot Temperature
Testing
Neoplasms

Cite this

A microwave surface applicator for tissue coagulation: Technical characteristics and performances. / Lepers, B; Clegg, Peter; Cronin, Nigel; Wieland, Ines.

In: Journal of Medical Devices: Transactions of the ASME, Vol. 6, No. 1, 014502, 2012.

Research output: Contribution to journalArticle

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