Patent ID: 8328799

Claim:
An electrosurgical device for directing energy to a target volume of tissue, comprising: a coaxial feedline having an inner conductor, an outer conductor coaxially disposed around the inner conductor, and a dielectric material disposed therebetween; and an antenna assembly, including: an extension of the inner conductor that extends distally beyond the outer conductor and the dielectric material at a distal end of the coaxial feedline into the antenna assembly; a first arcuate dielectric segment; a second arcuate dielectric segment, the first and second arcuate dielectric segments coupled one to the other along a longitudinal axis of the antenna assembly, surrounding a portion of the extension of the inner conductor that extends distally beyond the outer conductor and the dielectric material at the distal end of the coaxial feedline; and an elongated shaft overlying at least a portion of the second arcuate dielectric segment, the elongated shaft having an opening defined therethrough for passage of energy therethrough, the opening at least partially aligned with the first arcuate dielectric segment.