The slit canaliculus.

Canalicular stent tubes were inserted in patients at canaliculo-dacryocystorhinostomy, dacryocystorhinostomy with a common internal punctum membrane, or at dacryocystorhinostomy with small mucosal anastomosis. Canalicular slits occurred in 16% of cases, more often with polyethylene than with silicone, and more often with increased duration of implantation. With a large patent mucosal flap anastomosis, slitting did not significantly impair function. The need for adequate mucosal anastomosis is emphasized in the treatment of canalicular disease.