US5116369A
Expired / Lapsed
US
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Composition for intraocular lens
Assignee: Canon Inc
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Filing: 1990-09-14
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Granted: 1992-05-26
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Expires: 2010-09-14
Abstract
Abstract A composition for an intraocular lens comprising, an organopolysiloxane (A) having a viscosity of 10,000 cp or below and comprising at least one unsaturated aliphatic group, an organopolysiloxane (B) comprising at least three hydrogenated silyl units and a platinum compound; wherein the platinum compound based on its platinum content constitutes 10-200 ppm by weight of the composition. The composition provides a homogeneous intraocular lens even when it is injected into a crystalline capsule through a slender tube such as an injection needle.
Inventors
- 👤 Nobuo Kushibiki
- 👤 Noriyuki Nose
- 👤 Yukichi Niwa
- 👤 Norio Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:23
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/26; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; C; C08; C08L; C08L83/00; C08L83/04; A61L2430/00; A61L2430/16; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
116 words
An intraocular lens having a shear modulus of 1×10 3 -5×10 6 dyne/cm 2 and a transmittance of at least 50% with respect to visible radiation of 400-700 nm; said lens comprising a cured product of a composition consisting essentially of: (i) an organopolysiloxane (A) having a molecular weight less than or equal to 60,000, a viscosity of 10,000 cp or below at normal temperature and comprising at least one unsaturated aliphatic group in an average polymer molecule; (ii) an organopolysiloxane (B) comprising at least three hydrogenated silyl units in an average polymer molecule; and (iii) a platinum compound, wherein said platinum compound based on its platinum content constitutes 10-200 ppm by weight of said composition.
Claim 2
Dependent Claim
116 words
An intraocular lens having a shear modulus of 1×10 3 -5×10 6 dyne/cm 2 and a transmittance of at least 50% with respect to visible radiation of 400-700 nm; said lens comprising a cured product of a composition consisting essentially of: (i) an organopolysiloxane (A) having a molecular weight less than or equal to 60,000, a viscosity of 10,000 cp or below at normal temperature and comprising at least one unsaturated aliphatic group in an average polymer molecule; (ii) an organopolysiloxane (B) comprising at least three hydrogenated silyl units in an average polymer molecule; and (iii) a platinum compound, wherein said platinum compound based on its platinum content constitutes 10-200 ppm by weight of said composition.
Claim 3
Dependent Claim
21 words
An intraocular lens according to claim 1, wherein said organopolysiloxane (A) comprises 1-5 unsaturated aliphatic groups in an average polymer molecule.
Claim 4
Dependent Claim
20 words
An intraocular lens according to claim 1, wherein said organopolysiloxane (A) has a viscosity of 20-5,000 cp at normal temperature.
Claim 5
Dependent Claim
21 words
An intraocular lens according to claim 1, wherein said organopolysiloxane (B) comprises 3-5 hydrogenated silyl units in an average polymer molecule.
Claim 6
Dependent Claim
22 words
An intraocular lens according to claim 1, wherein said organopolysiloxane (B) has a viscosity of 10,000 cp or below at normal temperature.
Claim 7
Dependent Claim
20 words
An intraocular lens according to claim 5, wherein said organopolysiloxane (B) has a viscosity of 20-5,000 cp at normal temperature.
Claim 8
Dependent Claim
19 words
An intraocular lens according to claim 1, which has a viscosity of 20-10,000 cp at normal temperature before curing.
Claim 9
Dependent Claim
19 words
An intraocular lens according to claim 7, which has a viscosity of 20-5,000 cp at normal temperature before curing.
Claim 10
Dependent Claim
24 words
An intraocular lens according to claim 1, wherein said platinum compound based on its platinum content constitutes 20-150 ppm by weight of said composition.
Claim 11
Dependent Claim
22 words
An intraocular lens according to claim 1, having a transmittance of at least 85% with respect to visible radiation of 400-700 nm.
Claim 12
Dependent Claim
11 words
An intraocular lens according to claim 1, containing a retarding agent.
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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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |