Directional reflector shield assembly for a microwave ablation instrument

摘要

A directional reflective shield assembly (25) is provided for a microwave ablation instrument (20) having an antenna (23) coupled to a transmission line (21). The antenna (23) is formed to generate an electric field sufficiently strong to cause tissue ablation. The shield assembly (25) includes a cradle device (26) disposed about the antenna (23) in a manner substantially shielding a surrounding area of the antenna (23) from the electric field radially generated therefrom. The cradle device (26) further provides a window portion (27) communicating with the antenna (23) which is strategically located relative the antenna to direct a majority of the field generally in a predetermined direction.