Ring shaped contoured collagen shield for ophthalmic drug delivery
First Claim
1. A device for placement on the outer surface of the eye to provide protection of the eye, delivery of drugs to the eye, or provide both protection and drug delivery to the eye, without obstructing vision, comprisinga) a contoured collagen shield with one or more base curve radii selected to provide retention of the shield on the eye, a first portion of the shield configured to cover a central portion of the cornea and a second portion of the shield extending outward from the first portion and forming a ring around the first portion,b) the first portion of the shield comprising non-crosslinked collagen configured for rapid decomposition in the presence of enzymes in the tears, andc) the second portion comprising crosslinked collagen having a decomposition rate in the presence of enzymes in the tears over a period of time slower than the first portion.
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Accused Products
Abstract
A collagen corneal shield for placement on the outer surface of the eye for protection of the eye, for delivery of drugs to the eye, or for both protection and drug delivery to the eye, functions without obstructing vision. The shield has a first, central portion comprising non-crosslinked collagen capable of rapid decomposition in the presence of enzymes in the tears, and a second portion comprising crosslinked collagen which decomposes slowly in the presence of enzymes in the tears so that it remains on the eye for a period of time longer than the first portion. The first portion of the shield covers the central portion of the cornea and the second portion of the shield extends outward from the first portion. As a result of decomposition of the first portion the corneal shield becomes a ring or washer shape around the central portion and at least a portion of the cornea is no longer covered by the shield so that vision is not obstructed. The corneal shield can also be contoured so that it has one or more base curve radii selected to provide retention of the shield on the eye.
47 Citations
5 Claims
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1. A device for placement on the outer surface of the eye to provide protection of the eye, delivery of drugs to the eye, or provide both protection and drug delivery to the eye, without obstructing vision, comprising
a) a contoured collagen shield with one or more base curve radii selected to provide retention of the shield on the eye, a first portion of the shield configured to cover a central portion of the cornea and a second portion of the shield extending outward from the first portion and forming a ring around the first portion, b) the first portion of the shield comprising non-crosslinked collagen configured for rapid decomposition in the presence of enzymes in the tears, and c) the second portion comprising crosslinked collagen having a decomposition rate in the presence of enzymes in the tears over a period of time slower than the first portion.
Specification