Patent US4424305A successfully refreshed from Google Patents.
US4424305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical implants formed of polyurethane diacrylate compositions
Assignee: Tyndale Plains Hunter Ltd
•
Filing: 1982-09-01
•
Granted: 1984-01-03
•
Expires: 2002-09-01
Abstract
Abstract Surgical implants, intrauterine devices and the like formed of polyurethane diacrylate compositions obtained by reacting a diacrylate in the presence of from about 65 to about 95 weight percent of a hydrophilic polyurethane resin. The compositions will form a hydrogel upon immersion in water and are permeable to gases, ions and other low molecular weight species. The hydrophilic polyurethane diacrylate compositions may be molded to form shaped products that are dimensionally stable after repeated exposure to boiling water and exhibit memory. The shaped products contain distributed therein a desired medicament.
Inventors
- 👤 Francis E. Gould
- 👤 Christian W. Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:52
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; A61L15/42; A61L15/60; A61L17/00; A61L17/04; C; C08; C08F; C08F283/00; C08F299/00; C08F299/02; C08F299/06; C08F299/065; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C08G2210/00; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/489; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10S; Y10S521/00; Y10S521/905; Y10S528/00; Y10S528/904; Y10S623/00; Y10S623/924
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
77 words
An implant comprising a hydrophilic polyurethane diacrylate composition which will form a hydrogel upon immersion in water and is permeable to gases, ions and other low molecular weight species, which composition is dimensionally stable and exhibits memory, said polyurethane diacrylate composition comprising from about 90 to about 65 weight percent of a hydrophilic polyurethane resin characterized by terminal hydroxyl groups and from about 10 to about 35 weight percent of a diacrylate, said implant containing a medicament.
Claim 2
Dependent Claim
77 words
An implant comprising a hydrophilic polyurethane diacrylate composition which will form a hydrogel upon immersion in water and is permeable to gases, ions and other low molecular weight species, which composition is dimensionally stable and exhibits memory, said polyurethane diacrylate composition comprising from about 90 to about 65 weight percent of a hydrophilic polyurethane resin characterized by terminal hydroxyl groups and from about 10 to about 35 weight percent of a diacrylate, said implant containing a medicament.
Claim 3
Dependent Claim
12 words
The implant of claim 1 wherein said medicament is an antitubercular drug.
Claim 4
Dependent Claim
12 words
The implant of claim 1 wherein said medicament is a drug protagonist.
Claim 5
Dependent Claim
11 words
The implant of claim 1 wherein said medicament is a hormone.
Claim 6
Dependent Claim
11 words
The implant of claim 1 wherein said medicament is a steroid.
Claim 7
Dependent Claim
11 words
The implant of claim 1 wherein said medicament is a vitamin.
Claim 8
Dependent Claim
12 words
The implant of claim 1 in the form of an intrauterine device.
Claim 9
Dependent Claim
12 words
The intrauterine device of claim 7 in the shape of a diaphragm.
Claim 10
Dependent Claim
15 words
The intrauterine device of claim 7 having distributed throughout said polyurethane diacrylate composition a contraceptive.
Claim 11
Dependent Claim
12 words
The intrauterine device of claim 9 wherein said contraceptive is lactic acid.
Claim 12
Dependent Claim
111 words
An implant comprising a hydrophilic polyurethane diacrylate composition which will form a hydrogel upon immersion in water; is permeable to gases, ions and other low molecular weight species; is dimensionally stable and exhibits memory; obtained by the reaction of from about 10 to about 35 weight percent of a diacrylate having the formula: ##STR3## wherein R is selected from the group consisting of hydrogen and the methyl radical and n is a small whole number, such that the average molecular weight of the diacrylate is no greater than 1586; in the presence of from about 90 to about 65 weight percent of a hydrophilic polyurethane resin, said implant containing a medicament.
Claim 13
Dependent Claim
111 words
An implant comprising a hydrophilic polyurethane diacrylate composition which will form a hydrogel upon immersion in water; is permeable to gases, ions and other low molecular weight species; is dimensionally stable and exhibits memory; obtained by the reaction of from about 10 to about 35 weight percent of a diacrylate having the formula: ##STR3## wherein R is selected from the group consisting of hydrogen and the methyl radical and n is a small whole number, such that the average molecular weight of the diacrylate is no greater than 1586; in the presence of from about 90 to about 65 weight percent of a hydrophilic polyurethane resin, said implant containing a medicament.
Claim 14
Dependent Claim
12 words
The implant of claim 11 wherein said medicament is an antitubercular drug.
Claim 15
Dependent Claim
12 words
The implant of claim 11 wherein said medicament is a drug protagonist.
Claim 16
Dependent Claim
11 words
The implant of claim 11 wherein said medicament is a hormone.
Claim 17
Dependent Claim
11 words
The implant of claim 11 wherein said medicament is a steroid.
Claim 18
Dependent Claim
11 words
The implant of claim 11 wherein said medicament is a vitamin.
Claim 19
Dependent Claim
12 words
The implant of claim 11 in the form of an intrauterine device.
Claim 20
Dependent Claim
12 words
The intrauterine device of claim 17 in the shape of a diaphragm.
Claim 21
Dependent Claim
15 words
The intrauterine device of claim 17 having distributed throughout said polyurethane diacrylate composition a contraceptive.
References Cited (Backward Citations)
US3297745A
Cited
US3931123A
Cited
US3975350A
Cited
US4056496A
Cited
US3940542A
Cited
US4117184A
Cited
US4116786A
Cited
US4156067A
Cited
US4156066A
Cited
US4250248A
Cited
US4255550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |