Patent ID: 6916317

Claim:
A catheter for mapping and/or ablating tissue comprising: a body portion; a distal end portion having a distal tip and including a plurality of distal end portion electrodes proximal to said distal tip, said distal end portion electrodes adapted to produce a substantially continuous, elongated, lesion in said tissue when energized with radio frequency (RF) energy; a proximal deflection mechanism for deflecting substantially the entire length of said distal end portion in a predetermined direction and including at least a portion of the length of said proximal deflection mechanism located inside said body portion wherein said proximal deflection mechanism is a first pull wire; and a distal deflection mechanism for deflecting a region of said distal end portion including said distal tip in said predetermined direction, from a generally straight configuration into a hook-shaped configuration, and at least a portion of said distal deflection mechanism being located inside said body portion, wherein said distal deflection mechanism is a second pull wire and wherein said distal end portion electrodes are located proximal to the region deflected by said distal deflection mechanism, wherein said tissue comprises an isthmus of tissue between the tricuspid annulus and the inferior vena.