Radio frequency ablation system

A - Human Necessities – 61 – B

Patent

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A61B 18/14 (2006.01)

Patent

CA 2430970

An RF ablation system includes a catheter and an RF electrode that delivers RF electrical energy to the site of an occlusion. The system includes a mechanism for minimizing the likelihood that RF electrical energy will be applied directly to the vessel wall. In one embodiment of the invention, the catheter includes a number of tissue expanding jaws to engage a vessel wall and push the vessel wall away from the electrode to shield vessel walls from the electrode. In yet another embodiment of the invention, the electrode has a spiraled distal end with a radius that is larger than the radius of the catheter, such that the electrode engages the vessel wall and pushes the wall away from a conducting portion of the electrode. The portion of the electrode that engages the vessel wall is preferably coated with an insulating material to prevent delivery of RF electrical energy directly to the vessel wall.

L'invention concerne un système d'ablation à énergie RF qui comprend un cathéter et une électrode RF fournissant l'énergie RF sur un site d'occlusion. Le système comprend un mécanisme réduisant au minimum les risques d'application directe de l'énergie RF sur la paroi de vaisseau. Selon une variante, le cathéter comprend une pluralité de mâchoires d'expansion de tissu sollicitant la paroi de vaisseau et la repoussant par rapport à l'électrode pour assurer une protection de paroi contre l'électrode. Selon une autre variante, l'électrode comporte une extrémité distale en spirale dont le rayon est supérieur au rayon du cathéter, moyennant quoi l'électrode sollicite la paroi de vaisseau en la repoussant par rapport à une partie conductrice de cette électrode. La partie de l'électrode qui sollicite la paroi de vaisseau est de préférence revêtue de matériau isolant, ce qui empêche l'application directe d'énergie RF à la paroi de vaisseau.

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