Biodegradable stent of a polyorthoester polymer or a polyanhydride polymer
First Claim
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1. A stent wholly constructed of a biodegradable polymer that degrades from its surface inwardly when subjected to blood flow, such that bulk erosion is effectively precluded;
- wherein said polymer is hydrophobic and has water-labile linkages connecting monomers;
wherein said polymer comprises a polyorthoester or a polyanhydride; and
wherein said polyorthoester polymer or said polyanhydride polymer incorporates imide bonds, and wherein said polyorthoester polymer or said polyanhydride polymer comprises an imide content of 20% to 40% of said polymer.
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Abstract
A stent is fabricated utilizing a polymer that is selected for its tendency to degrade from the surface inwardly rather than undergo bulk erosion so as to substantially reduce the risk of large particles becoming detached and being swept downstream. Such polymer is hydrophobic yet has water-labile linkages interconnecting the monomers. Ester or imide bonds are incorporated in the polymer to render the surface degrading materials suitable for use in stent applications. The stent may be coated with such polymer or may be wholly formed therefrom.
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7 Claims
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1. A stent wholly constructed of a biodegradable polymer that degrades from its surface inwardly when subjected to blood flow, such that bulk erosion is effectively precluded;
- wherein said polymer is hydrophobic and has water-labile linkages connecting monomers;
wherein said polymer comprises a polyorthoester or a polyanhydride; and
wherein said polyorthoester polymer or said polyanhydride polymer incorporates imide bonds, and wherein said polyorthoester polymer or said polyanhydride polymer comprises an imide content of 20% to 40% of said polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- wherein said polymer is hydrophobic and has water-labile linkages connecting monomers;
Specification