Stents with ceramic drug reservoir layer and methods of making and using the same
First Claim
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1. A method of making a stent, the method comprising steps of:
- implanting at least one type of ion into a metallic stent body material in at least one surface portion of the stent body material to produce at least one porous layer at the surface portion, the at least one porous layer comprising a plurality of open pores with a first average size for at least 50 volume percent of the open pores;
depositing a layer of ceramic particles on the porous layer, the ceramic particles having a second average size for at least 50 volume percent of the ceramic particles, the second average size being smaller than one tenth of the first average size; and
compressing the layer of ceramic particles to form a plurality of protuberances and/or recesses on a surface of the layer of ceramic particles, wherein compressing the layer of ceramic particles comprises compressing using a solid surface having a plurality of protuberances and/ or recesses.
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Abstract
A method of making a drug eluting stent comprises forming a porous stent body surface layer by ion implantation, applying a layer of ceramic particles on the porous layer and compressing the layer of ceramic particles. The layer of ceramic particles can be compressed to successively higher densities. Drugs can be loaded into the layer of ceramic materials at a relatively low density before the layer of ceramic materials is compressed to a higher density to achieve a desired low drug release rate.
997 Citations
23 Claims
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1. A method of making a stent, the method comprising steps of:
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implanting at least one type of ion into a metallic stent body material in at least one surface portion of the stent body material to produce at least one porous layer at the surface portion, the at least one porous layer comprising a plurality of open pores with a first average size for at least 50 volume percent of the open pores; depositing a layer of ceramic particles on the porous layer, the ceramic particles having a second average size for at least 50 volume percent of the ceramic particles, the second average size being smaller than one tenth of the first average size; and compressing the layer of ceramic particles to form a plurality of protuberances and/or recesses on a surface of the layer of ceramic particles, wherein compressing the layer of ceramic particles comprises compressing using a solid surface having a plurality of protuberances and/ or recesses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of making a stent, the method comprising steps of:
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depositing a layer of ceramic particles on at least one surface portion of a stent body material; compressing the layer of ceramic particles to a first density; dispersing at least one drug into the layer of ceramic particles while the layer of ceramic particles is at the first density; and compressing the layer of ceramic particle to a second density that is higher than the first density. - View Dependent Claims (16, 17, 22)
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18. A method of making a stent, the method comprising:
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implanting at least one type of ions into a metallic stent body material in at least one surface portion of the stent body material to produce at least one porous layer at the surface portion, the at least one porous layer comprising a plurality of open pores with a first average size for at least 50 volume percent of the open pores; depositing a layer of particles on the porous layer, the particles having a second average size for at least 50 volume percent of the particles, the second average size being smaller than one tenth of the first average size; and compressing the layer of particles to form a plurality of protuberances and/or recesses on a surface of the layer of particles, wherein compressing the layer of particles comprises compressing using a solid surface having a plurality of protuberances and/or recesses. - View Dependent Claims (19)
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20. A method of making a stent, the method comprising steps of:
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implanting at least one type of ions into a metallic stent body material in at least one surface portion of the stent body material to produce at least one porous layer at the surface portion; depositing a layer of particles on the at least one porous layer; compressing the layer of particles to a first density; dispersing at least one drug into the layer of particles while the layer of particles is at the first density; and compressing the layer of particle to a second density that is higher than the first density. - View Dependent Claims (21, 23)
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Specification