US5505722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corneal curvature adjusting ring
Assignee: Addition Tech Inc
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Filing: 1994-07-28
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Granted: 1996-04-09
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Expires: 2014-07-28
Abstract
Abstract Surgical apparatus for inserting a plastic, split end, adjusting ring into the stroma of the cornea of the eye wherein the adjusting ring includes, as a part thereof, a dissecting head to part the stroma and provide a pathway for the adjusting ring as the ring is rotated. The ends of the adjusting ring are moved to change the shape of the cornea to a desired shape in accordance with the desired visual correction after which the ends of the adjusting ring are fixably joined to maintain the desired shape.
Inventors
- 👤 Lauren G. Kilmer
- 👤 Alvin E. Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:00
CPC Classifications
B; B21; B21F; B21F3/00; B21F3/02; A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/147; A61F9/00; A61F9/007; A61F9/013; B21F45/00; B21F45/008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
A curvature adjusting ring for insertion into the cornea of an eye consisting essentially of a polymer and having a flat, split circular shape with a forward end and a rearward end, said forward end able to enter a circular pathway in said cornea for receiving said adjusting ring, and said adjusting ring have a cross-sectional shape comprising a nonequilateral hexagon with opposing longer sides, wherein the longer sides of the hexagon define a top surface and a bottom surface of the curvature adjusting ring, wherein the bottom surface is substantially at an angle N which substantially corresponds to the slope of the anterior surface of said cornea.
Claim 2
Dependent Claim
108 words
A curvature adjusting ring for insertion into the cornea of an eye consisting essentially of a polymer and having a flat, split circular shape with a forward end and a rearward end, said forward end able to enter a circular pathway in said cornea for receiving said adjusting ring, and said adjusting ring have a cross-sectional shape comprising a nonequilateral hexagon with opposing longer sides, wherein the longer sides of the hexagon define a top surface and a bottom surface of the curvature adjusting ring, wherein the bottom surface is substantially at an angle N which substantially corresponds to the slope of the anterior surface of said cornea.
Claim 3
Dependent Claim
13 words
The ring of claim 1 wherein the ring consists essential of a plastic.
Claim 4
Dependent Claim
13 words
The ring of claim 2 wherein the ring consists essentially of polymethyl methacrylate.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-09 | 1999-10-09 | 2000-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-09 | 2003-10-09 | 2004-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-09 | 2007-10-09 | 2008-04-09 | $7700.00 | Window Closed / Lapsed |