Patent ID: 8435235

Claim:
Apparatus for treating a hollow anatomical structure, the apparatus comprising: a sheath, the sheath having an elongate shaft defining an internal lumen, the shaft having a sidewall, a proximal portion, and a distal portion, the sidewall being more transmissive of therapeutic light energy in the distal portion than in the proximal portion, the distal portion forming a distal tip of the shaft and having a distal-facing opening at the distal tip; an optical fiber disposed within and movable along the lumen, the optical fiber having a fiber tip; a light propagation path which extends distally from the fiber tip and through the distal-facing opening; and a position limiter configured to limit distal movement of the fiber tip relative to the distal tip of the shaft such that the fiber tip cannot extend distally farther than 2 mm proximal of the distal tip of the shaft, the position limiter comprising a narrowed portion of the lumen in the distal portion of the shaft, the narrowed portion forming a shoulder, and a structure on the optical fiber configured to abut the shoulder; wherein the position limiter comprises a tube at least partially surrounding the optical fiber, and the tube includes at least one tab and at least one recess in a distal face thereof.