US3915172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capillary drain for glaucoma
Assignee: Czech Academy of Sciences
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Filing: 1973-03-26
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Granted: 1975-10-28
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Expires: 1993-03-26
Abstract
Abstract The invention relates to a capillary drain consisting of a flat bundle of capillaries made from hydrogels and suitable particularly for treating glaucoma in opthalmology. The drain is manufactured so that a system of parallel fibers or filaments is laid between parallel plates separated from each other by flat thin distance inserts or gaskets, an initiated monomer mixture suitable for producing water-swellable cross-linked hydrogels is filled into the mold thus obtained, the monomer mixture is allowed to polymerize under cross-linking conditions, the mold is removed and the fibers or filaments removed e.g., by dissolving or melting or pulling them out.
Inventors
- 👤 Otto Wichterle
- 👤 Lubomir Krejci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:59
CPC Classifications
A; A61; A61M; A61M27/00; A61F; A61F9/00; A61F9/007; A61F9/00781; A61L; A61L29/00; A61L29/04; A61L29/041; A61L29/14; A61L29/145; A61M25/00; A61M25/0009
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
A surgical opthalmic drain for treating glaucoma comprising a sheet of a homogeneous physilogically inert hydrogel having a plurality of spaced capillary passages open at each end arranged parallel to the surface of said sheet and to each other whereby particles, such as cells, as well as fluid may be passed through the capillary passages.
Claim 2
Dependent Claim
55 words
A surgical opthalmic drain for treating glaucoma comprising a sheet of a homogeneous physilogically inert hydrogel having a plurality of spaced capillary passages open at each end arranged parallel to the surface of said sheet and to each other whereby particles, such as cells, as well as fluid may be passed through the capillary passages.
Claim 3
Dependent Claim
23 words
Capillary drain according to claim 1 wherein said hydrogel contains about 30 to about 85% by weight of water in the swollen condition.
Claim 4
Dependent Claim
23 words
Capillary drain according to claim 1 wherein said hydrogel contains about 40 to about 60% by weight of water in the swollen condition.
Claim 5
Dependent Claim
24 words
Capillary drain according to claim 1 wherein said hydrogel is prepared from a monomer mixture comprising hydroxyethyl methacrylate, ethylene glycol dimethacrylate and anhydrous glycerol.
Claim 6
Dependent Claim
22 words
Capillary drain according to claim 1 wherein said hydrogel is prepared from a monomer mixture comprising aqueous zinc chloride, aCrylonitrile and acrylamide.
Claim 7
Dependent Claim
22 words
The drain according to claim 1 wherein the capillary passages are each in the range of from 0.03 to 2mm in diameter.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |