A microwave delivery device, including a coaxial feedline having an inner conductor, an inner dielectric insulator coaxially disposed about, the inner conductor, and an outer conductor coaxially disposed about, the inner dielectric, and a radiating portion operably coupled to a distal end. The radiating portion includes a radiating portion inner conductor operable coupled to and extending from a distal end of the coaxial feedline inner conductor, a shielding outer conductor helically wrapped about the radiating portion inner conductor and operably coupled to the coaxial feedline outer conductor； and a shielding dielectric positioned between the radiating portion inner conductor and the shielding outer conductor wherein the width of the shielding outer conductor varies according to the longitudinal position thereof along the coaxial feedline inner conductor, and a cap operably coupled to a distal end of the radiating portion inner conductor and the shielding outer conductor to provide an electrical connection therebetween.On décrit un coupleur servant à coupler un câble coaxial souple, un système de refroidissement de fluide et la gaine extérieure d'un cathéter. Le coupleur comprend un corps de coupleur de fluide présentant une entrée de fluide, une sortie de fluide, un renflement de dérivation, une gaine extérieure, et un système de joint d'étanchéité logé dans le corps de coupleur de fluide. Le système de joint d'étanchéité comprend un diaphragme d'étanchéité distal et un diaphragme d'étanchéité proximal configurés pour former avec le corps de coupleur de fluide un joint étanche aux fluides.
