Patent ID: 7641633

Claim:
An apparatus for applying energy to cause shrinkage of a hollow anatomical structure, the apparatus comprising: a catheter having a shaft, an outer diameter and a working end, the outer diameter of the catheter is less than the inner diameter of the hollow anatomical structure; at least two electrodes located at the working end of the catheter so as to provide effective pairs of electrodes, wherein activation of the at least two electrodes causes shrinkage of the hollow anatomical structure adjacent to the electrodes; a plurality of bowable members located at the working end of the catheter, wherein the shrinkage of the hollow anatomical structure is limited to a diameter defined by the plurality of bowable members; and a balloon located between the bowable members and the catheter, and separate from the bowable members, wherein the balloon engages and forces the bowable members radially outward when the balloon is inflated.