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US5110852A
Expired / Lapsed
US
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Filament material polylactide mixtures
Assignee: University of Groningen
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Filing: 1988-10-27
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Granted: 1992-05-05
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Expires: 2008-10-27
Abstract
Abstract A surgical filament produced by spinning a mixture of polylactides and additive.
Inventors
- 👤 Sylwester Gogolewski
- 👤 Albert J. Pennings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:35
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/88; D01F6/92; A; A61; A61L; A61L17/00; A61L17/06; A61L17/10; A61L17/12; C; C08; C08L; C08L67/00; C08L67/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
Filament material produced by the process involving dry or wet-spinning a mixture comprising a polyester material and an additive selected from the group consisting of non-reactive polyurethane, glycolide, lactide, camphor, benzoic acid-2-hydroxyacetate, hexamethylbenzene, 1,2-cyclohexandione, and other low molecular weight organic compounds having melting temperatures in the range of 40° to 180° C. and which are soluble in trichloromethane, dichloromethane, ethanol and mixtures thereof, and mixtures of the foregoing members of the group.
Claim 2
Dependent Claim
72 words
Filament material produced by the process involving dry or wet-spinning a mixture comprising a polyester material and an additive selected from the group consisting of non-reactive polyurethane, glycolide, lactide, camphor, benzoic acid-2-hydroxyacetate, hexamethylbenzene, 1,2-cyclohexandione, and other low molecular weight organic compounds having melting temperatures in the range of 40° to 180° C. and which are soluble in trichloromethane, dichloromethane, ethanol and mixtures thereof, and mixtures of the foregoing members of the group.
Claim 3
Dependent Claim
57 words
Filament material produced by a process according to claim 1, characterized in that the filament is prepared by dry-spinning, at room temperature, a solution in which the poly-ester is poly-(L-lactide). PLLA, and/or poly(DL-lactide), PDLLA, in a concentration in the range of 5-70% by weight in the presence of the polyurethane which is a biodegradable polyester urethane material.
Claim 4
Dependent Claim
113 words
Synthetic surgical filament produced by spinning a mixture comprised of a polyester in predominant amount by weight, the polyester having a viscosity-average molecular weight of at least about 3×10 5 kg/kmol as calculated according to the formula [n]=5.45×10 -4 M y 0 .73, for a viscosity measured at 25° C. in trichloromethane, and an additive in lessor amount by weight, the additive being selected from the group consisting of polyurethanes, glycolide, lactide, camphor, benzoic acid-2-hydroxyacetate, hexamethylbenzene, 1,2-cyclohexandione, and other low molecular weight organic compounds having melting temperatures in the range of 40°-180° C. and which are soluble in trichloromethane, dichloromethane, ethanol and mixtures thereof, and mixtures of the foregoing members of the group.
Claim 5
Dependent Claim
113 words
Synthetic surgical filament produced by spinning a mixture comprised of a polyester in predominant amount by weight, the polyester having a viscosity-average molecular weight of at least about 3×10 5 kg/kmol as calculated according to the formula [n]=5.45×10 -4 M y 0 .73, for a viscosity measured at 25° C. in trichloromethane, and an additive in lessor amount by weight, the additive being selected from the group consisting of polyurethanes, glycolide, lactide, camphor, benzoic acid-2-hydroxyacetate, hexamethylbenzene, 1,2-cyclohexandione, and other low molecular weight organic compounds having melting temperatures in the range of 40°-180° C. and which are soluble in trichloromethane, dichloromethane, ethanol and mixtures thereof, and mixtures of the foregoing members of the group.
Claim 6
Dependent Claim
27 words
The filament of claim 3 wherein the polyester is a polylactide and the additive in the mixture ranges in amount from about 1 to 45% by weight.
Claim 7
Dependent Claim
11 words
The filament of claim 4 wherein the additive is a polyurethane.
Claim 8
Dependent Claim
12 words
The filament of claim 4 wherein the polylactide is poly(L-lactide) or poly(DL-lactide).
Claim 9
Dependent Claim
8 words
Articles formed from the filament of claim 1.
Claim 10
Dependent Claim
26 words
The filament of claim 3 having a diameter of about 0.3 to 1×10 -4 m. and having a tensile strength of at least about 0.4 Gpa.
Claim 11
Dependent Claim
14 words
The filament of claim 3 resulting from extraction of the additive subsequent to spinning.
Claim 12
Dependent Claim
10 words
The filament of claim 9 wherein the additive is camphor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-05 | 1995-11-04 | 1996-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-05 | 1999-11-04 | 2000-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-05 | 2003-11-04 | 2004-05-05 | $7700.00 | Window Closed / Lapsed |