Patent ID: 8639310

Claim:
A system for sensing electrical events about a selected intrabody annulus region and for treating tissue in the selected annulus region, comprising: a first catheter and a second catheter; the first catheter comprising: a first handle assembly; a first shaft having a first proximal end coupled to the first handle assembly, and a first distal end, the first shaft extending along a first axis; a first lumen extending entirely through the first distal end of the first shaft along the first axis; a second lumen extending entirely through the first distal end of the first shaft along the first axis; an ablation element provided adjacent the first distal end of the first shaft; an expandable member adjacent the first distal end; and wherein the first lumen is adapted to receive the second catheter therethrough; the second catheter comprising: a second handle assembly; a second shaft having a second proximal end coupled to the second handle assembly, and a second distal end, the second shaft of the second catheter extending along a second axis; and a distal ring provided at the second distal end of the second shaft of the second catheter and oriented substantially perpendicular to the second axis of the second shaft of the second catheter, the distal ring having a plurality of discrete electrodes positioned about the distal ring of the second catheter.