Abstract: A punctal plug inserted into the punctum-canaliculus, includes a shaft, a tip portion attached to one end of said shaft and a brim attached to the other end of said shaft, and a thin member penetrated into either one or all 3 out of said tip portion, shaft and brim, or said tip portion and shaft, or said shaft and brim. The thin member is thread 0.05 mm or less in diameter. The brim is disk shaped and the diameter of the brim is far smaller than the diameter of the tip. A protuberance is attached to the tip portion.

Abstract: A punctal plug inserted into the punctum-canaliculus, includes a shaft, a tip portion attached to one end of said shaft and a brim attached to the other end of said shaft, and a thin member penetrated into either one or all 3 out of said tip portion, shaft and brim, or said tip portion and shaft, or said shaft and brim. The thin member is thread 0.05 mm or less in diameter. The brim is disk shaped and the diameter of the brim is far smaller than the diameter of the tip. A protuberance is attached to the tip portion.

Abstract: An apparatus for intubation of the lacrimal duct comprising a thinner tube (or rod), a thicker tube(s) extending from one end or both ends of a thinner tube (or rod) and a probe which is inserted through a small cut applied to the thicker tube(s) wherein for the tube to be pushed into the lacrimal duct using a probe, the inner surface of the thicker tube(s) has a step(s), protuberance(s), groove(s) and septum (septa), and the shape of the inner space of the thicker tube is the frustum of a circular cone, and for the probe to be removed easily, lubricants such as olive oil, lipiodol ultrafluid, ointment and so on are applied to the surface of the probe and/or inner part of the thicker tube, and also the thinner tube (or rod) is longer than the canalicular length for the boundary portion(s) between the thinner tube (or rod) and thicker tube(s) to be positioned in the lacrimal sac—nasolacrimal duct to get better stability in the lacrimal duct.

Abstract: A device for intubation of a lacrimal duct is inserted into the lacrimal duct, having a smaller diameter tube or rod portion, and a larger diameter tube which is connected with one end of the smaller diameter portion, and a stopper which consists of a plug, brim, ring, etc., attached to the other end of the smaller diameter tube or rod. The tip of the larger diameter tube is a closed end.

Abstract: An apparatus for the treatment of the lacrimal duct in which both ends of a thinner and softer tube or rod 0.5-0.7 mm OD and 20-40 mm in length are connected with thicker and harder tubes (0.9-1.2 mm OD and 15-50 mm in length), resulting in a total length of 50-120 mm. Both ends (2 mm) are sealed by silicone to make the closed end and then formed sharp pointed in conical shape.