Methods and apparatus are disclosed for forming annular lesions in tissue.
The methods include introduction of an optical apparatus proximate to a
tissue site, via, for example, a catheter. The optical apparatus includes
a pattern-forming optical wave guide in communication with a light
transmitting optical fiber. Energy is transmitted through the optical
fiber, such that radiation is propagated through the optical fiber and
the wave guide projects an annular light pattern, e.g., a circle or a
halo.