Theodore C. Ormsby,Russell Chung,George Leung,Gwo Jenn Shen
申请号：
US12424287
公开号：
US08934989B2
申请日:
2009.04.15
申请国别(地区):
US
年份:
2015
代理人:
摘要：
An ablation device which transmits radio frequency (RF) energy for the ablation of biological tissues has elongate inner and outer coaxial conductors extending from a proximal portion to a distal portion. An RF antenna is disposed at the distal portion of the device and transmits RF energy for ablation of a tissue region to be treated. Reflection of energy from the tissue or the ablation point is reduced by providing multiple layers of dielectric media about the antenna, or by providing a gradual transition point from the conductors to the antenna tip, by means of a longitudinally stepped dielectric layer transformer.
