US4713375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscoelastic solution
Assignee: Individual
•
Filing: 1985-08-01
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Granted: 1987-12-15
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Expires: 2005-08-01
Abstract
Abstract Viscoelastic solution including a buffered solution, 1-8% cellulose gum and 1-8% chondroitin sulfate, pH adjusted to 7.2-7.6 at a osmolality between 200-400 MOSM. The buffered solution can be HEPES buffered minimum essential media (MEM), phosphate buffer system (PBS), balanced salt solution, or TC199.
Inventors
- 👤 Richard L. Lindstrom
- 👤 Debra L. Skelnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:37
CPC Classifications
C; C08; C08L; C08L1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A method of protecting cells and cell coatings during eye surgery, which method comprises bringing the cells or cell coatings into contact with a viscoelastic composition for use in ophthalmic surgery, which composition comprises effective amounts of: a. a buffered solution which is at least one of a balanced salt solution, a buffered minimum essential medium, a phosphate buffered system, or TC 199; b. at least one of a cellulose gum, carboxypropyl methyl cellulose or hydroxypropyl methyl cellulose; and, c. chondroitin sulfate, the composition having a pH of 7.2-7.6 and an osmolality of 200-400 MOSM.
Claim 2
Independent Claim
95 words
A method of protecting cells and cell coatings during eye surgery, which method comprises bringing the cells or cell coatings into contact with a viscoelastic composition for use in ophthalmic surgery, which composition comprises effective amounts of: a. a buffered solution which is at least one of a balanced salt solution, a buffered minimum essential medium, a phosphate buffered system, or TC 199; b. at least one of a cellulose gum, carboxypropyl methyl cellulose or hydroxypropyl methyl cellulose; and, c. chondroitin sulfate, the composition having a pH of 7.2-7.6 and an osmolality of 200-400 MOSM.
References Cited (Backward Citations)
US4436730A
Cited
US4486416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |