A bidirectional mapping catheter is provided. The catheter comprises an
elongated flexible tubular catheter body having an axis and proximal and
distal ends. A mapping assembly, which is mounted at the distal end of
the tubular body, has a preformed generally circular main region having
an outer surface that is generally transverse to the axis of the catheter
body. The generally circular main region has proximal and distal ends and
carries a plurality of spaced apart electrodes. An electrode lead wire is
associated with each electrode. Each electrode lead wire has proximal and
distal ends and extends through the catheter body and into the mapping
assembly. The distal end of each electrode lead wire is electrically
connected to its associated electrode. First and second puller wires are
provided. Each puller wire has proximal and distal ends and extends
through the tubular catheter body. The distal end of each puller wire is
anchored at or near the distal end of the catheter body. A handle is
connected to the proximal ends of the catheter body and puller wires for
moving the puller wires longitudinally relative to the catheter body.
Longitudinal movement of a puller wire relative to the catheter body
results in deflection of the distal end of the catheter body.