US3786812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact lens for olar drug delivery
Assignee: Sunsoft Corp
•
Filing: 1972-03-10
•
Granted: 1974-01-22
•
Expires: 1992-03-10
Abstract
Abstract A method of making a contact lens for delivering medications directly to the ocular tissue. The central segment being transparent and capable of correcting refractive errors. The peripheral segment containing the desired medication and the rate at which the medication is released to the eye is controlled.
Inventors
- 👤 C Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:51
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/0008; A61F9/0017
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
A contact lens for the delivery of therapeutic drugs to the eye comprising: a contact lens having continuous smooth curved surfaces of concavo-convex form in section, said lens having a transparent central optical area and a peripheral area surrounding said central area having a therapeutic drug embedded within said peripheral area and providing said therapeutic drug to the eye at a selected rate.
Claim 2
Dependent Claim
63 words
A contact lens for the delivery of therapeutic drugs to the eye comprising: a contact lens having continuous smooth curved surfaces of concavo-convex form in section, said lens having a transparent central optical area and a peripheral area surrounding said central area having a therapeutic drug embedded within said peripheral area and providing said therapeutic drug to the eye at a selected rate.
Claim 3
Dependent Claim
55 words
A contact lens as in claim 1 wherein said contact lens comprises a hydrophilic lens fabricated in the xerogel state and hydrated before being placed on the eye, said transparent central area and the drug-containing peripheral area having an equal expansion ratio to provide a continuous smooth curved surface in the xerogel and hydrated state.
Claim 4
Dependent Claim
46 words
A contact lens as in claim 1 wherein the selected release rate of the drug is controlled by providing parsimonious particles of low water content polymer containing said drug within said peripheral area, said parsimonious particles being embedded within a matrix of high water content polymer.
Claim 5
Dependent Claim
42 words
A contact lens as in claim 2 and further comprising: said hydrophilic lens being formed from a polymer having allyl methacrylate as an ingredient, said hydrated lens being exposed to radiation from radioactive cobalt isotopes to effect cross-linking of the hydrated polymer.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |