US4795461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
UV absorbing lens material
Assignee: Pfizer Health AB
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Filing: 1986-06-12
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Granted: 1989-01-03
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Expires: 2006-06-12
Abstract
Abstract The invention is concerned with a UV absorbing plastics material to be used in intraocular lenses, said material having been produced by means of incorporating in the plastics monomer mixture, prior to the polymerization thereof, a combination of chromophores selected from two groups of substances.
Inventors
- 👤 Bengt Lindqvist
- 👤 Bjarne Hogstrom
- 👤 Martin Sandberg
- 👤 Per I. Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:06
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/50; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; A61F2002/16965; A61L2430/00; A61L2430/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A composition for manufacturing intraocular lenses that absorb UV and short-wave visible light, characterized in that a light absorption active amount of (I) 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4and (II) methyl-2-hydroxy-5-((4-hydroxy-phenyl)azo)benzoate are added to a monomer mixture suitable for preparing intraocular lenses prior to the polymerization thereof, so that a polished disc of the polymerized composition having a thickness of 1 mm has the following transmission characteristics: the transmittance (T) is less than 1% below 380 nm, and is less than 10% at 400 nm, and is equal to 50% at a point within the range of 420 to 460 nm, and is at least 85% above 500 nm, and is at least 90% above 550 nm.
Claim 2
Dependent Claim
112 words
A composition for manufacturing intraocular lenses that absorb UV and short-wave visible light, characterized in that a light absorption active amount of (I) 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4and (II) methyl-2-hydroxy-5-((4-hydroxy-phenyl)azo)benzoate are added to a monomer mixture suitable for preparing intraocular lenses prior to the polymerization thereof, so that a polished disc of the polymerized composition having a thickness of 1 mm has the following transmission characteristics: the transmittance (T) is less than 1% below 380 nm, and is less than 10% at 400 nm, and is equal to 50% at a point within the range of 420 to 460 nm, and is at least 85% above 500 nm, and is at least 90% above 550 nm.
Claim 3
Dependent Claim
31 words
The composition of claim 1 wherein the lens material monomer is methyl methacrylate and the chromophores (I) and (II) are present at concentrations in the range from 0.005 to 0.3% (w/w).
Claim 4
Dependent Claim
47 words
An intraocular lens that absorbs UV and short-wave visible light which is formed from a lens composition produced by incorporating in a monomer mixture suitable for preparing intraocular lenses prior to the polymerization thereof a light absorption active amount of (I) 2-(5-chloro-2H-benzotriazol-2-yl) -6-(1,1-dimethylethyl)-4-methyl-phenol and (II) methyl-2-hydroxy -5-((4-hydroxy-phenyl)azo)benzoate.
Claim 5
Dependent Claim
47 words
An intraocular lens that absorbs UV and short-wave visible light which is formed from a lens composition produced by incorporating in a monomer mixture suitable for preparing intraocular lenses prior to the polymerization thereof a light absorption active amount of (I) 2-(5-chloro-2H-benzotriazol-2-yl) -6-(1,1-dimethylethyl)-4-methyl-phenol and (II) methyl-2-hydroxy -5-((4-hydroxy-phenyl)azo)benzoate.
Claim 6
Dependent Claim
32 words
The intraocular lens of claim 3 wherein the lens material monomer is methyl methacrylate and the chromophores (I) and (II) are present at concentrations in the range from 0.005 to 0.3% (w/w).
Claim 7
Dependent Claim
101 words
An intraocular lens absorbing UV and short-wave visible light produced by incorporating a mixture of (I) 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1,1-dimethyl-and (II) methyl-2-hydroxy-5-((4-hydroxy-phenyl)azo) benzoate together with an initiator dissolved in a volume of a monomer mixture suitable for preparing intraocular lenses which is then added to the bulk volume of said monomer solution, this bulk volume having been heated to a desired temperature within the range of 45° to 90° C., whereupon the viscous prepolymer so formed is allowed to polymerize at said temperature in a cell, whereafter the temperature is raised for the final polymerization and the lens is prepared from the polymerization product.
Claim 8
Dependent Claim
101 words
An intraocular lens absorbing UV and short-wave visible light produced by incorporating a mixture of (I) 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1,1-dimethyl-and (II) methyl-2-hydroxy-5-((4-hydroxy-phenyl)azo) benzoate together with an initiator dissolved in a volume of a monomer mixture suitable for preparing intraocular lenses which is then added to the bulk volume of said monomer solution, this bulk volume having been heated to a desired temperature within the range of 45° to 90° C., whereupon the viscous prepolymer so formed is allowed to polymerize at said temperature in a cell, whereafter the temperature is raised for the final polymerization and the lens is prepared from the polymerization product.
Claim 9
Dependent Claim
29 words
The intraocular lens of claim 5 wherein the lens material monomer is methyl methacrylate and the chromophores are present at concentrations in the range from 0.005 to 0.3% (w/w).
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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) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |