| 摘要 |
A canalicular plug includes a throughbore provided with a valve. Preferably, the plug has a proximal occluding head, a central shaft and a distal body portion. The throughbore is preferably stepped and includes a large proximal portion for receiving an insertion tool and a smaller distal portion. The valve is preferably integrally molded with the canalicular plug, and the plug is preferably made from a resilient biocompatible material. According to a preferred aspect of the invention, the distal body portion includes at least one slot dividing the distal portion into a plurality of resilient portions which are biased apart and coupled by a foldable curtain portion extending between the resilient portions. The resilient portions are inwardly compressible about the slot. When compressed together, the distal ends of the resilient portions together form a generally conical or frustoconical shape which facilitates insertion through the punctal opening.
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