Corneal implant and method of manufacture

• US 6,632,244 B1
• Filed: 09/06/2000
• Issued: 10/14/2003
• Est. Priority Date: 12/23/1998
• Status: Expired due to Term

• Current Assignee: ReVision Optics, Inc.
• Original Assignee: Anamed, Inc.
• Inventors: Nigam, Alok
• Primary Examiner(s): McDermott, Corrine
• Assistant Examiner(s): Phan, Hieu
• Application Number:
  US09/656,059
• Time in Patent Office: 1,133 Days
• Field of Search: 623/6.11, 623/6.56, 623/6.59, 623/6.61
• US Class Current: 623/6.59
• CPC Class Codes: A61F 2/147 Implants to be inserted in the stroma for refractive correction, e.g. ring-like implants

Abstract

Prosthetic implants designed to be implanted in the cornea for modifying the cornea curvature and altering the corneal refractive power for correcting myopia, hyperopia, astigmatism, and presbyopia, and, in addition, such implants formed of a micro-porous hydrogel material.

Claims

1. A corneal implant, comprising:

a) a body formed of an optically clear, biocompatible material having inner and outer surfaces and an index of refraction substantially the same as that of corneal tissue;

b) the body being solid and formed of a microporous hydrogel having irregular passageways for nutrient transport, the microporous hydrogel having micropores ranging in diameter from 50 Angstroms to 10 microns.

2. The corneal implant of claim 1, wherein the body is shaped to correct for hyperopia.

3. The corneal implant of claim 1, wherein the body is shaped to correct for myopia.

4. The corneal implant of claim 1, wherein the implant is shaped to correct for astigmatism.

5. The corneal implant of claim 1, wherein the implant is shaped to correct for presbyopia.

6. The corneal implant of claim 1, wherein the microporous hydrogel has a water content greater than 40% and up to approximately 90%.

7. The corneal implant of claim 1, wherein the microporous hydrogel is formed from at least one hydrophilic monomer which is cross-linked with at least one multi- or di-olefinic cross-linking agent.

8. The corneal implant of claim 1, wherein the micropores are formed to permit nutrient and fluid transfer to prevent tissue necrosis, and the micropores are sized to act as a barrier against tissue in growth.