Patent US6423092B2 successfully refreshed from Google Patents.
US6423092B2
Expired / Lapsed
US
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Biodegradable stent
Assignee: Ethicon Inc
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Filing: 2001-08-20
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Granted: 2002-07-23
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Expires: 2021-08-20
Abstract
Abstract A biodegradable stent for implantation into a lumen in a human body. The stent in one embodiment is made from a biodegradable fiber having an inner core and an outer layer. The outer layer is a blend of two polymer components. The inner core has a first degradation rate, and the outer layer has a second degradation rate. The second degradation rate is slower than the first degradation rate. The fiber softens in vivo such that the stent is readily passed from the lumen as a softened fragment or filament after a predetermined period of time through normal flow of body fluids passing through the lumen.
Inventors
- 👤 Arindam Datta
- 👤 Shawn Thayer Huxel
- 👤 Dennis D. Jamiolkowski
- 👤 Yufu Li
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:18
CPC Classifications
A; A61; A61L; A61L31/00; A61L31/14; A61L31/148; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/88; A61L31/04; A61L31/041; A61L31/06; A61L31/08; A61L31/10; A61F2210/00; A61F2210/0004
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
187 words
A stent, comprising: a tubular structure having a longitudinal passage, said structure comprising: an inner core having an exterior surface comprising a biodegradable polymer formed from monomers selected from the group consisting of lactide, glycolide, para-dioxanone, trimethylene carbonate, caprolactone, and combinations thereof, said polymer having a first degradation rate; an outer section covering the exterior surface of the inner core, the outer section comprising a blend of a first biodegradable polymer component and a second biodegradable polymer component, said first polymer component comprising a first biodegradable polymer, wherein said first biodegradable polymer comprises a lactide/glycolide copolymer having at least about 80 mole percent of polymerized glycolide, said second polymer component comprising a second biodegradable polymer, wherein said second biodegradable polymer comprises a lactide-rich copolymer comprising at least about 50 mole percent of polymerized lactide, said outer layer having a second degradation rate, wherein the blend comprises at least about 50 weight percent of the first component and at least about 5 weight percent of the second component, wherein said second degradation rate of said outer layer is slower than said first degradation rate of the inner core.
Claim 2
Dependent Claim
187 words
A stent, comprising: a tubular structure having a longitudinal passage, said structure comprising: an inner core having an exterior surface comprising a biodegradable polymer formed from monomers selected from the group consisting of lactide, glycolide, para-dioxanone, trimethylene carbonate, caprolactone, and combinations thereof, said polymer having a first degradation rate; an outer section covering the exterior surface of the inner core, the outer section comprising a blend of a first biodegradable polymer component and a second biodegradable polymer component, said first polymer component comprising a first biodegradable polymer, wherein said first biodegradable polymer comprises a lactide/glycolide copolymer having at least about 80 mole percent of polymerized glycolide, said second polymer component comprising a second biodegradable polymer, wherein said second biodegradable polymer comprises a lactide-rich copolymer comprising at least about 50 mole percent of polymerized lactide, said outer layer having a second degradation rate, wherein the blend comprises at least about 50 weight percent of the first component and at least about 5 weight percent of the second component, wherein said second degradation rate of said outer layer is slower than said first degradation rate of the inner core.
Claim 3
Dependent Claim
16 words
The stent of claim 1 , wherein the outer structure comprises a lattice having openings therein.
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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) | 2005-07-22 | 2006-01-21 | 2006-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-07-22 | 2010-01-21 | 2010-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-07-22 | 2014-01-21 | 2014-07-23 | $7700.00 | Window Closed / Lapsed |