US4750901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Implant for drainage of aqueous humour
Assignee: Individual
•
Filing: 1987-03-05
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Granted: 1988-06-14
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Expires: 2007-03-05
Abstract
Abstract An implant (1a) for drainage of aqueous humour in glaucoma comprising an episcleral plate (2) having an elevated peripheral ridge (3) and a drainage tube (4) for insertion into the anterior chamber of the eye which has an opening (8) to the upper surface of the episcleral plate (2). A secondary elevated ridge (7) divides the ridged area on the upper surface of the plate (2) into two areas with the opening (8) of the drainage tube (4) located within one area. Preferably the area in which the tube opening (8) is located is significantly smaller than the remaining area of the episcleral plate (2).
Inventors
- 👤 Anthony C. B. Molteno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:02
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/00781
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
An implant for drainage of aqueous humour in glaucoma, the said implant comprising an episcleral plate having an elevated peripheral ridge, a drainage tube having an opening to the upper surface of the episcleral plate inside the elevated ridge, a secondary elevated ridge rising from the upper surface of the episcleral plate to divide the ridged area on the said upper surface of the plate into two areas with the opening of the drainage tube located within one area.
Claim 2
Dependent Claim
79 words
An implant for drainage of aqueous humour in glaucoma, the said implant comprising an episcleral plate having an elevated peripheral ridge, a drainage tube having an opening to the upper surface of the episcleral plate inside the elevated ridge, a secondary elevated ridge rising from the upper surface of the episcleral plate to divide the ridged area on the said upper surface of the plate into two areas with the opening of the drainage tube located within one area.
Claim 3
Dependent Claim
35 words
An implant as claimed in claim 1 wherein the area of the episcleral plate in which the opening to the tube is located is significantly smaller than the remaining ridged area of the episcleral plate.
Claim 4
Dependent Claim
44 words
An implant as claimed in claim 1 wherein the secondary elevated ridge extends at either end from the peripheral ridge and describes a path towards the center of the plate to divide off a sector of the episcleral plate spanning substantially forty five degrees.
Claim 5
Dependent Claim
16 words
An implant as claimed in claim 3 wherein the secondary ridge describes a substantially semi-elliptic shape.
Claim 6
Dependent Claim
41 words
An implant as claimed in claim 3 wherein the distance from the opening to the drainage tube and the point of the subsidiary ridge furtherest removed from the opening to the center of the episcleral plate is approximately substantially 3 millimetres.
Claim 7
Dependent Claim
31 words
An implant as claimed in claim 1 wherein the height of the subsidiary ridge at the position closest to the center of the episcleral plate is substantially 0.75 of a millimetre.
Claim 8
Dependent Claim
23 words
An implant as claimed in claim 1 wherein the opening to the drainage tube passes through the peripheral ridge on the episcleral plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |