A punctum plug includes a proximal head, a distal body, and a shaft between the head and the body. The head and shaft are provided with a bore to facilitate insertion of the plug through the punctal opening with an insertion tool. According to one aspect of the invention, the head is provided with a...http://www.google.es/patents/US6027470?utm_source=gb-gplus-sharePatente US6027470 - Punctum plug and method for inserting the same into the punctual opening
Punctum plug and method for inserting the same into the punctual opening
