Transurethral radio frequency ablation apparatus

A - Human Necessities – 61 – B

Patent

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Details

A61B 18/14 (2006.01) A61B 17/00 (2006.01) A61B 18/00 (2006.01)

Patent

CA 2164860

This invention is a transurethral radio frequency apparatus (12) for ablation of the prostate gland through the urethra formed by a urethral wall, a probe (14) consisting of a flexible elongate tubular member (10) having proximal and distal extremities and a cylindrical sleeve ablation electrode (76) formed of a conductive material carried by the distal extremity of the flexible elongate tubular member (10) and having a bore therein. The flexible elongate tubular member (10) is provided with a first flow lumen (41) for delivering a cooled fluid to the bore of the ablation electrode (76) and a second flow lumen (48) for returning the cooled fluid. Means are connected to the probe for supplying a coolant solution (26) to the probe, to suppply radio frequency energy (37) to the electrode (76) while it is being cooled and to monitor the temperature (36) of the ablation electrode (76) so mat the ablation electrode (76) is maintained at a temperature below a predetermined temperature.

Cette invention concerne un appareil (12) transuréthral à fréquence radio pour l'ablation de la prostate depuis l'urèthre, à travers la paroi uréthrale. Une sonde (14) consiste en un élément tubulaire flexible allongé (10) ayant une extrémité proximale et une extrémité distale, et en une électrode d'ablation (76) formée d'un manchon cylindrique en un métal conducteur, porté par l'extrémité distale de l'élément tubulaire allongé flexible (10) et entourant un alésage. L'élément tubulaire flexible allongé (10) est pourvu d'un premier conduit (41) pour amener un fluide refroidi dans l'alésage de l'électrode d'ablation (76) et un second conduit (48) pour le retour du fluide refroidi. On prévoit un moyen relié à la sonde pour apporter une solution de réfrigérant (26) à la sonde, un moyen pour fournir de l'énergie de fréquence radio (37) à l'électrode (76) pendant qu'elle est refroidie et un moyen permettant de surveiller la température (36) de l'électrode d'ablation (76), pour que l'électrode d'ablation (76) soit maintenue en dessous d'une température prédéterminée.

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