Microwave ablation catheter assembly, method for electrosurgical treatment of target tissue, and microwave ablation system

摘要

A microwave ablation catheter assembly (16) is provided. A coaxial cable (38) is configured to connect to a microwave energy source (90) at its proximal end (41) and to a distal radiating section (42) at its distal end (44). The coaxial cable (38) includes inner and outer conductors (40, 32) and a dielectric (50) positioned therebetween. An elongated working channel (18) is configured to receive the coaxial cable (38) for positioning the coaxial cable (38) adjacent to the target tissue (T). At least a portion of the inner surface (28) of the extended working channel (18) is electrically conductive. The electrically conductive inner surface (28) of the extended working channel (18) is configured so that the inner and outer conductors (40) of the coaxial cable (38) are activated when the distal radiating section (42) of the coaxial cable (38) is activated. , 32) can act as a balun to maintain a balanced signal.