Method and device for treating and enlarging body lumens
First Claim
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1. An endovascular stent comprising:
- a tubular structure having an initial diameter, said structure being composed of a first material expandable from the initial diameter to an enlarged diameter;
a delivery matrix including at least one filament which is interlaced with the tubular structure and expandable therewith from said initial diameter to said enlarged diameter; and
a bioactive substance releasably contained within the filament of the delivery matrix, wherein the filament is composed of a second material which is porous and/or which will degrade over time in a vascular environment to release the bioactive substance.
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Abstract
The present invention relates generally to stents having delivery matrices which provide for the controlled release of bioactive substances. The delivery matrices comprise porous and erodible filaments, and multiple filaments may be employed in order to release different bioactive substances and/or the same bioactive substance at different delivery rates. The stents are particularly useful for preventing restenosis of dilated body lumens, such as blood vessels. Methods for preventing stenosis of dilated body lumens or locally delivering bioactive compounds to tissue are also provided.
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Citations
24 Claims
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1. An endovascular stent comprising:
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a tubular structure having an initial diameter, said structure being composed of a first material expandable from the initial diameter to an enlarged diameter; a delivery matrix including at least one filament which is interlaced with the tubular structure and expandable therewith from said initial diameter to said enlarged diameter; and a bioactive substance releasably contained within the filament of the delivery matrix, wherein the filament is composed of a second material which is porous and/or which will degrade over time in a vascular environment to release the bioactive substance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An endovascular stent comprising:
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a tubular structure having an initial diameter, said structure being composed of a metal and being expandable from an initial diameter to an enlarged diameter; a delivery matrix including at least one first filament and at least one second filament, which first and second filaments are composed of a polymeric material and interlaced with the tubular structure and expandable therewith from said initial diameter to said enlarged diameter; and a bioactive substance releasably contained within both the first and second filaments wherein at least one of the first and second filaments is composed of a polymer material which will degrade over time in a vascular environment to release the bioactive substance and wherein the first and second filaments are composed of different materials. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for treating body lumens said method comprising:
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inserting into the body lumen a stent comprising (i) a tubular structure composed of a first material having an initial diameter, (ii) a delivery matrix including at least one filament interlaced with the tubular structure, and (iii) a bioactive substance releasably contained within said filament;
an dexpanding the stent at a location within the body lumen selected to be treated wherein the filament releases the bioactive substance from within under the conditions present the immediate environment. - View Dependent Claims (21, 22, 23, 24)
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Specification