Ocular occluder and method of insertion
First Claim
1. An ocular occluder for blocking lacrimal flow through the punctum or canaliculus of the human eye, wherein said occluder:
- (a) comprises a hydrophilic polymeric material which forms a hydrogel, when hydrated in water;
(b) is capable of being stretched along its length to at least an additional about 50% beyond its initial length;
(c) is rigid at room temperature prior to the absorption of water; and
(d) absorbs water when inserted into the punctum or canaliculus thereby becoming soft and expanding in diameter so as to conform to the shape of said punctum or canaliculus.
1 Assignment
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Accused Products
Abstract
An ocular plug design and method of insertion is described for the treatment of dry eye. This ocular plug is generally a narrow rod-like cylinder of appropriate diameter, which may be tapered at one end, for insertion into an ocular channel, such as the punctum or the canaliculus. The plug is prepared from a hydrophilic polymeric material which forms a hydrogel upon absorption of water, but is rigid in its nonhydrated form. The plug is hydrated, formed into a length and diameter which is appropriate for insertion into an ocular channel (i.e., it is elongated), and dried so as to become frozen in its elongated state prior to insertion into the ocular channel. Once inserted into the ocular channel, the plug absorbs water, thereby becoming a hydrogel which is soft and pliable, and it expands to adapt to the size and shape of the patient'"'"'s punctum or canaliculus. Once the plug expands to the size of a particular ocular channel, the plug is met with resistance from the surrounding tissue. At that point, expansion of the plug ceases and the plug can effectively block tear drainage through the ocular channel.
93 Citations
24 Claims
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1. An ocular occluder for blocking lacrimal flow through the punctum or canaliculus of the human eye, wherein said occluder:
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(a) comprises a hydrophilic polymeric material which forms a hydrogel, when hydrated in water;
(b) is capable of being stretched along its length to at least an additional about 50% beyond its initial length;
(c) is rigid at room temperature prior to the absorption of water; and
(d) absorbs water when inserted into the punctum or canaliculus thereby becoming soft and expanding in diameter so as to conform to the shape of said punctum or canaliculus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification