US4913904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ophthalmological collagen coverings
Assignee: MOSKOVSKY NAUCHNO-TEKNICHESKY COMPLEKS MIKROCHIRUGIJA GLAZA USSR MOSCOW
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Filing: 1987-12-11
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Granted: 1990-04-03
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Expires: 2007-12-11
Abstract
Abstract Ophthalmologic collagen coverings derived from animal eyes and a process for preparing such coverings comprising treatment of a fibrous tunic of an animal eye with an alkali metal hydroxide in a saturated solution of a salt of an alkali metal, followed by neutralization, dissolution in an aqueous solution of an organic acid, purification of the resulting solution of collagen by dialysis against a buffer solution while bringing the solution of collagen to a pH of 4.5 to 7.5 and drying the thus-obtained solution of collagen simultaneously with shaping spherical coverings therefrom.
Inventors
- 👤 Svyatoslav N. Fyodorov
- 👤 Sergey N. Bagrov
- 👤 Tatyana S. Amstislavskaya
- 👤 Irina A. Maklakova
- 👤 Sergey V. Maslenkov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:54
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/36; A61L27/3683; A61L27/3687; A61F; A61F2/00; A61F2/02; A61F2/14; A61K; A61K35/00; A61K35/12; A61K35/44; A61L27/3604; A61L2430/00; A61L2430/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
26 words
In the method of treatment of all kinds of ophthalmological conditions with a collagen substance, the improvement comprising using a collagen preparation isolated from animal eyes.
Claim 2
Dependent Claim
26 words
In the method of treatment of all kinds of ophthalmological conditions with a collagen substance, the improvement comprising using a collagen preparation isolated from animal eyes.
Claim 3
Dependent Claim
18 words
The method of claim 1, wherein the collagen is isolated from the fibrous tunic of an animal eye.
Claim 4
Dependent Claim
16 words
The method of claim 1, wherein the collagen is isolated from the sclera of animal eyes.
Claim 5
Dependent Claim
13 words
The method of claim 1, wherein the collagen is isolated from pig eyes.
Claim 6
Dependent Claim
16 words
The method of claim 4, wherein the collagen is isolated from the sclera of pig eyes.
Claim 7
Dependent Claim
29 words
The method of claim 1, wherein the collagen which contacts the eye is provided as a shaped article conforming to the curvature of the front section of the eye.
Claim 8
Dependent Claim
20 words
The method of claim 1, wherein the collagen which contacts the eye is provided in the form of a fluid.
Claim 9
Dependent Claim
16 words
The method of claim 6, wherein an ophthalmically active drug is incorporated into said shaped article.
Claim 10
Dependent Claim
15 words
The method of claim 7, wherein an ophthalmically active drug is incorporated into said fluid.
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) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |