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  • Eye (ophthalmic) surgery trephines designed to cut and remove cylindrical sections of tissue from the lacrimal ducts of the eye. These trephines are typically handheld, manual instruments consisting of a detachable, sharp, hollow, cylindrical blade with a beveled edge and a manually operated handle; they are available in a variety of diameters (usually from less than 1 to a few millimeters), some include a coaxial center-point guide. Lacrimal trephines are used in minor surgical procedures of the eye intended to remove scar tissue from stenotic or totally occluded lacrimal ducts (i.e., canalicular obstruction), usually followed by stenting of the duct. Dedicated, very thin (typically less than 1 mm diameter) trephines are available for removing micro-cylindrical scars prior to stenting the stenotic lacrimal duct (i.e., canalicular lacrimal trephines).
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