Ablation device for creating a lesion within tissue includes an angle indexing
apparatus. The angle indexing apparatus includes an index-key and an indexer. The
index-key is secured to the ablation device. The indexer is secured in a position
relative to which the index-key can move. The index-key is adapted to mate with
the indexer in a plurality of positions, thereby allowing operation of the ablation
device in a plurality of orientations.