US4540568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injectionable viscoelastic ophthalmic gel
Assignee: Individual
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Filing: 1984-06-27
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Granted: 1985-09-10
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Expires: 2004-06-27
Abstract
Abstract An improved injectionable viscoelastic gel for use in opthalmic surgical and treatment procedures, wherein the gelling agent is a high molecular weight polyacrylamide or polymethacrylamide.
Inventors
- 👤 Seymour F. Trager
- 👤 Victoria S. Chylinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:42
CPC Classifications
A; A61; A61K; A61K47/00; A61K47/30; A61K47/32; A61K31/00; A61K31/74; A61K31/785; A61K9/00; A61K9/0012; A61K9/0048; A61L; A61L27/00; A61L27/14; A61L27/16; A61L27/50; A61L27/52; A61L2400/00; A61L2400/06; A61L2430/00; A61L2430/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
An injectionable viscoelastic gel particularly adapted for use in ophthalmic surgical procedures and treatments which gel consisting essentially of from about 2 to about 5 percent by weight of a polymer selected from polyacrylamide and polymethacrylamide, said polymer having a molecular weight of from about 1 to about 6 million; from about 0.4 to about 8.6 percent by weight sodium chloride, from about 0.075 to about 0.3 percent by weight postassium chloride, from about 0.04 to about 0.33 percent by weight calcium chloride, from about 0.02 to about 0.04 percent by weight magnesium chloride hexahydrate, from about 0.3 to about 0.4 percent by weight sodium acetate, from about 0.15 to about 0.20 percent by weight of a buffer, remainder water.
Claim 2
Dependent Claim
120 words
An injectionable viscoelastic gel particularly adapted for use in ophthalmic surgical procedures and treatments which gel consisting essentially of from about 2 to about 5 percent by weight of a polymer selected from polyacrylamide and polymethacrylamide, said polymer having a molecular weight of from about 1 to about 6 million; from about 0.4 to about 8.6 percent by weight sodium chloride, from about 0.075 to about 0.3 percent by weight postassium chloride, from about 0.04 to about 0.33 percent by weight calcium chloride, from about 0.02 to about 0.04 percent by weight magnesium chloride hexahydrate, from about 0.3 to about 0.4 percent by weight sodium acetate, from about 0.15 to about 0.20 percent by weight of a buffer, remainder water.
Claim 3
Dependent Claim
12 words
A gel as defined in claim 1 wherein said polymer is polyacrylamide.
Claim 4
Dependent Claim
25 words
A gel as defined in claim 1 wherein said polymer is present in an amount of from about 3.5 to about 4.5 percent by weight.
Claim 5
Dependent Claim
22 words
A gel as defined in claim 1 wherein said polymer has a molecular weight of from about 4.5 to about 5.5 million.
Claim 6
Dependent Claim
14 words
A gel as defined in claim 1 wherein said buffer is sodium citrate dihydrate.
Claim 7
Dependent Claim
65 words
A gel as defined in claim 1 consisting essentially of about 4 percent by weight of said polymer having a molecular weight of about 5 million, about 0.49 percent by weight sodium chloride, about 0.075 percent by weight potassium chloride, about 0.048 percent by weight calcium chloride, about 0.03 percent by weight magnesium chloride hexahydrate, about 0.17 percent by weight sodium citrate dihydrate, remainder water.
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) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |