ELECTROSURGICAL DEVICES WITH BALUN STRUCTURES FOR AIR EXPOSURE OF ANTENNA RADIATING SECTION AND METHOD OF DIRECTING ENERGY TO TISSUE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide electrosurgical devices with balun structures for air exposure of an antenna radiating section and a method of use.SOLUTION: An energy applicator 100 for directing energy to tissue includes: a feedline 110 having an inner conductor, an outer conductor and a dielectric material disposed therebetween; and an antenna assembly 12 having a radiating section 105, 140 operably coupled to the feedline. The energy applicator also includes: a first balun structure 108 configured to substantially confine energy to the radiating section when the energy applicator is energized and disposed in tissue; and a second balun structure 129 configured to substantially prevent energy emitted from the radiating section from propagating proximally to the second balun structure along the feedline when the energy applicator is energized but not disposed in tissue.