Steerable catheter with rotatable tip electrode and method...

A - Human Necessities – 61 – B

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A61B 18/14 (2006.01)

Patent

CA 2286656

A catheter, used e.g. for cardiac ablation, has a handle, a shaft, and a J- bendable distal end containing tip and ring electrodes. The tip electrode is axially rotatable and has insulated and uninsulated portions. As the tip electrode is rotated, the impedance between it and a reference level is observed. When the impedance reaches a maximum, this indicates that the uninsulated portion lies against the tissue and the insulated portion faces the bloodstream. An electrogram can be taken from the electrode, or an ablation current can then be applied to it. Short circuiting of the signal or current through the blood is thus reduced.

Cathéter utilisable p. ex. pour des ablations dans le myocarde. Ce cathéter possède un manche, une tige, et une extrémité distale pouvant être pliée en forme de J, contenant une pointe électrode et des électrodes annulaires. La pointe électrode est rotative axialement et présente des parties isolées et des parties non isolées. Lorsque la pointe électrode tourne, on observe l'impédance entre l'électrode et un seuil de référence. Lorsque l'impédance atteint un maximum, cela indique que la partie non isolée est en contact avec le tissu et que la partie isolée fait face au flux sanguin. Un électrogramme peut être relevé à partir de l'électrode, ou un courant d'ablation peut être appliqué à cette dernière. Ce cathéter permet de réduire les court-circuitages du signal ou du courant occasionnés par le sang.

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