title: Analysis of a novel expanded tip wire (ETW) antenna for microwave ablation of cardiac arrhythmias.
abstract: A novel expanded tip wire (ETW) catheter antenna is proposed for microwave ablation for the treatment of atrial fibrillation (AF). The antenna is designed as an integral part of coaxial cable so that it can be inserted via a 6F catheter. A numerical model based on the rotationally symmetric finite-difference time-domain technique incorporating the generalized perfectly matched layer as the absorbing boundary condition has been utilized to accurately model the interaction between the antenna and the myocardium. Numerical and in-vitro experimental results are presented for specific absorption rate, return loss and heating pattern produced by the antenna. Both numerical modeling and in-vitro experimentation show that the proposed ETW antenna produces a well-defined electric field distribution that provides continuous long and linear lesions for the treatment of AF.
authors.affiliation: ICT Group, Faculty of Engineering and Key University Research Center on Health Technologies, University of Technology, Sydney, NSW, 2007, Australia.
authors.forename: Heng-Mao
authors.initials: HM
authors.lastname: Chiu
authors.forename: Ananda Sanagavarapu
authors.initials: AS
authors.lastname: Mohan
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Weily
authors.forename: Duncan J R
authors.initials: DJ
authors.lastname: Guy
authors.forename: David L
authors.initials: DL
authors.lastname: Ross
mesh_terms: D000818:Animals; D001281:Atrial Fibrillation / Q000503:physiopathology / Q000628:therapy*; D017115:Catheter Ablation / Q000295:instrumentation* / Q000379:methods; D002417:Cattle; D017076:Computer-Aided Design; D004307:Dose-Response Relationship, Radiation; D004566:Electrodes; D004867:Equipment Design / Q000379:methods; D005240:Feasibility Studies; D006352:Heart Ventricles / Q000503:physiopathology / Q000528:radiation effects*; D006358:Hot Temperature / Q000627:therapeutic use; D008872:Microwaves / Q000627:therapeutic use*; D011874:Radiometry / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013813:Therapy, Computer-Assisted / Q000379:methods