title: Lacrimal trephine.
abstract: This article introduces a surgical instrument that facilitates treatment of obstructions of the common canaliculus or the internal canalicular punctum and which can be used with failure of dacryocystorhinostomy secondary to a membrane formation in the area of nasolacrimal anastomosis.
mesh_terms: D003608:Dacryocystorhinostomy; D006801:Humans; D007765:Lacrimal Apparatus / Q000601:surgery*; D008722:Methods; D013525:Surgical Instruments