Certain embodiments include a punctum plug for blocking flow of lacrimal fluid in an eye, the plug having an introducible portion comprising a dehydrated material hydratable by physiological saline to swell from a first diameter to a second diameter that is at least 50% greater than the first diameter,...http://www.google.es/patents/US20050197614?utm_source=gb-gplus-sharePatente US20050197614 - Occlusive biomedical devices, punctum plugs, and methods of use thereof
Occlusive biomedical devices, punctum plugs, and methods of use thereof
