Radio-frequency based catheter system and hollow co-axial...

A - Human Necessities – 61 – B

Patent

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Details

A61B 18/04 (2006.01) A61B 18/14 (2006.01)

Patent

CA 2321413

An improved radio frequency catheter system for ablating biological tissues of body vessel in a patient including a catheter (3), a deployable antenna guide (36) disposed at the distal portion of the catheter, and a radio-frequency ("RF") antenna (54) mounted on the antenna guide. The RF antenna includes an axial passageway to accommodate the antenna guide, is adapted to receive, and transmit RF energy for tissue ablation. Upon deployment, the antenna guide acquires a loop configuration which establishes line contact with the body vessel conformable to its internal contour to prescribe the precise, and affixed tissue ablation pathway despite body vessel movements. The RF antenna is carried by the antenna guide to be deployed along the established tissue ablation pathway. Alignment of the loop with the desired tissue ablation pathway is facilitated with the use of radiopaque markers, and intra-cardiac electrodes mounted along the antenna guide. The catheter, as well as the antenna, can be provided with steering or deflection mechanism for navigation through the body vessel passageways. A hollow coaxial cable is provided for the delivery of RF energy.

L'invention porte sur un cathéter diffuseur d'ondes RF servant à l'ablation de tissus biologiques comportant un cathéter (3) proprement dit s'introduisant dans un vaisseau du patient, un guide d'antenne déployable placé à l'extrémité distale du cathéter, et une antenne RF (54) montée sur le guide d'antenne. L'antenne RF, qui comprend un passage axial abritant le guide d'antenne, reçoit puis émet de l'énergie RF servant à l'ablation des tissus. Une fois déployé le guide d'antenne prend la forme d'une boucle en contact linéaire avec le corps du vaisseau et se conformant à son contour intérieur et définissant la ligne fixe et précise d'ablation des tissus quelque soient les mouvements du vaisseau. L'antenne RF, portée par le guide d'antenne, se déploie le long de la ligne d'ablation établie. L'alignement de la boucle sur la ligne établie est facilité par des marqueurs opaques, et par des électrodes intracardiaques disposées le long du guide d'antenne. Le cathéter, de même que l'antenne, peuvent être munis de mécanismes de guidage ou d'infléchissement leur permettant de se diriger à l'intérieur des vaisseaux. Un câble coaxial creux achemine l'énergie RF.

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