Biodegradable stent
First Claim
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1. 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.
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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.
288 Citations
2 Claims
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1. A stent, comprising:
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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. - View Dependent Claims (2)
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Specification