Patent US4568157A successfully refreshed from Google Patents.
US4568157A
Expired / Lapsed
US
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Goniotomy lens
Assignee: The University of Texas System
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Filing: 1984-07-11
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Granted: 1986-02-04
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Expires: 2004-07-11
Abstract
Abstract A goniotomy lens includes a truncated generally pyramidal body having four reflective sides, a concave smaller end face and an angled larger upper end face. The angled upper end face permits a standard operating microscope of be utilized since light produced by the microscope is reflected off-axis from the surface to minimize glare. The smaller end face has a curvature of approximately 43 diopters in order to sealing mate with the human eye. The reflective sides of the lens enable the angle of the anterior chamber to be viewed during a goniotomy. The ratio of the height of lens to the width of its base is advantageously less than 2 and most advantageously approximately 1.
Inventors
- 👤 Badrudin Kurwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:31
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; A; A61; A61B; A61B3/00; A61B3/10; A61B3/117; A61F; A61F9/00; A61F9/007; A61F9/008; A61F9/009; A61F2009/00861; A61F2009/00868; A61F2009/00885; A61F2009/00891
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
A lens useful in performing a goniotomy comprising a truncated generally pyramidal body having four planar sides, a smaller end face and a larger end face, said smaller end face being concave and adapted to conform to the human cornea, the larger end face, oriented in opposition to said smaller end face, being generally planar and angled slightly to a perpendicular to the optical axis of the lens, at least one of said sides being reflective and oriented to enable the chamber angle of the eye to the viewed when said smaller end face is resting on the human cornea, the ratio of the height of the lens measured along its optical axis to the width of said smaller end face being approximately one such that said lens is self-supporting atop the cornea.
Claim 2
Dependent Claim
133 words
A lens useful in performing a goniotomy comprising a truncated generally pyramidal body having four planar sides, a smaller end face and a larger end face, said smaller end face being concave and adapted to conform to the human cornea, the larger end face, oriented in opposition to said smaller end face, being generally planar and angled slightly to a perpendicular to the optical axis of the lens, at least one of said sides being reflective and oriented to enable the chamber angle of the eye to the viewed when said smaller end face is resting on the human cornea, the ratio of the height of the lens measured along its optical axis to the width of said smaller end face being approximately one such that said lens is self-supporting atop the cornea.
Claim 3
Dependent Claim
25 words
The lens of claim 1 wherein angle of said larger end face to a perpendicular to the optical axis of the lens is approximately 10°.
Claim 4
Dependent Claim
17 words
The lens of claim 1 wherein the curvature of said smaller end face is approximately 43 diopters.
Claim 5
Dependent Claim
20 words
The lends of claim 3 wherein the diameter of the curvature of the smaller end face is approximately 7 millimeters.
Claim 6
Dependent Claim
36 words
The lens of claim 1 wherein the width of the smaller face is approximately 7 millimeters, the height of the lens is approximately 7 millimeters and the width of the larger face is approximately 14 millimeters.
Claim 7
Dependent Claim
26 words
The lens of claim 1 wherein the ratio of the area of the larger end face to the area of smaller end face is approximately 4.
Claim 8
Dependent Claim
29 words
The lens of claim 1 wherein said sides are angled at about 40° to about 50° to a horizontal plane when said lens is situated on a patient's cornea.
Claim 9
Dependent Claim
24 words
The lens of claim 7 wherein said sides are planar and are connected to one another and to said smaller and larger end faces.
Claim 10
Dependent Claim
13 words
The lens of claim 8 wherein said lens has a square horizontal cross-section.
Claim 11
Dependent Claim
17 words
The lens of claim 7 wherein said lens is made of a unitary piece of optical material.
Claim 12
Dependent Claim
16 words
The lens of claim 1 wherein said larger end face is coated with a glare-resistant coating.
References Cited (Backward Citations)
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US4067646A
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US4033679A
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US4134647A
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US4378147A
Cited
US4439026A
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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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |