light energy is utilized to shrink or tighten tissue surrounding a hollow organ , cavity , duct or naturally occurring or surgically created passage by cross - linking the collagen of the surrounding tissue and ccausing scar formation therein . the present device may be used in the esophagus in the area of the sphincter to treat gerd , in the female urethra to treat fsi or at the vesicouretal junction to treat vur . in the present device , a plurality of plastic tubes , each containing a slidable optical fiber with a sharpened distal end , are affixed to the outer surface of a balloon , which is mounted near the distal end of a closed end catheter . the balloon catheter may be inserted into the body inside a retractable protective sheath . when the sheath is retracted , exposing the balloon , the balloon is inflated , which presses the distal ends of the plastic tubes against the surrounding tissue . the optical fibers are simultaneously advanced manually a selected distance out of the plastic tubes into the tissue surrounding the organ , cavity , duct or passage , reducing the diameter thereof . in a preferred embodiment , superelastic metal tubes with sharp , syringe - shaped ends , which have been preformed into a curved shape , are attached to the distal ends of the optical fibers . when advanced and released from the confines of the plastic tubes , the metal tubes revert to their original shape and curve outward , piercing the tissue . a fluid pathway is provided for injecting a bulking material , such as a biocompatible collagen , to further reduce the diameter of the passageway . the injected collagen can be cross - linked by laser energy , thereby reducing the mobility of the injected bulking material .