Use of Plasma in Formation of Biodegradable Stent Coating
First Claim
1. A method for the manufacture of an intraluminal device bearing a therapeutic agent releasable from the device in a time-controlled manner, the method comprising:
- exposing a metallic substrate to a gaseous plasma form of a substance that polymerizes in the plasma form under conditions causing the substance to form a polymer anchor coating of about 500 Å
in thickness or less on the substrate; and
depositing over the polymer anchor coating a layer containing the therapeutic agent wherein substantially all of the therapeutic agent is releasable into a physiological environment gradually over a period ranging from about one hour up to about six months.
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Accused Products
Abstract
Metallic stents are treated with a gaseous species in a plasma state under conditions causing the species to polymerize and to be deposited in polymerized form on the metallic stent surface prior to the application of a drug-polymer mixture, which is done by conventional non-plasma deposition methods. The drug-polymer mixture once applied forms a coating on the stent surface that releases the drug in a time-release manner and gradually erodes, leaving only the underlying plasma-deposited polymer. In certain cases, the plasma-deposited polymer itself erodes or dissolves into the physiological medium over an extended period of time, leaving only the metallic stent. While the various polymers and drug remain on the stent, the plasma-deposited polymer enhances the adhesion of the drug-polymer anchor coating and maintains the coating intact upon exposure to the mechanical stresses encountered during stent deployment.
154 Citations
130 Claims
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1. A method for the manufacture of an intraluminal device bearing a therapeutic agent releasable from the device in a time-controlled manner, the method comprising:
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exposing a metallic substrate to a gaseous plasma form of a substance that polymerizes in the plasma form under conditions causing the substance to form a polymer anchor coating of about 500 Å
in thickness or less on the substrate; anddepositing over the polymer anchor coating a layer containing the therapeutic agent wherein substantially all of the therapeutic agent is releasable into a physiological environment gradually over a period ranging from about one hour up to about six months. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method for the manufacture of an intraluminal device bearing a therapeutic agent releasable from the device in a time-controlled manner, the method comprising:
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exposing a metallic substrate to a gaseous plasma form of a substance that polymerizes in the plasma form under conditions causing the substance to form a polymer anchor coating on the substrate; and depositing over the polymer anchor coating a layer containing the therapeutic agent in a polymer matrix that releases substantially all of the therapeutic agent into a physiological environment gradually over a period ranging from about one hour up to about six months, and wherein following release of the therapeutic agent, any polymer remaining on the substrate is about 500 Å
or less in thickness. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 91)
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70. A stent for placement in a body lumen, the stent comprising:
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a plurality of struts coupled together forming a substantially tubular structure, the plurality of struts having a polymer anchor coating of about 500 Å
in thickness or less disposed thereon and a layer containing a therapeutic agent positioned over the polymer anchor coating, wherein the polymer anchor coating is formed from a gaseous plasma form of a substance that polymerizes on the struts while in the plasma form, andwherein substantially all of the therapeutic agent is released into a physiological environment gradually over a period ranging from about one hour up to about six months. - View Dependent Claims (71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101)
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102. A method for delivering a therapeutic agent to a target treatment site, the method comprising:
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introducing a delivery catheter having a stent disposed thereon to the target treatment site; and deploying the stent into the target treatment site, wherein the stent comprises a plurality of struts having a polymer anchor coating of about 500 Å
in thickness or less disposed thereon and a layer containing the therapeutic agent positioned over the polymer anchor coating, wherein the polymer anchor coating is formed from a gaseous plasma form of a substance that polymerizes on the struts while in the plasma form, andwherein substantially all of the therapeutic agent is released into the target treatment site gradually over a period ranging from about one hour up to about 6 months. - View Dependent Claims (103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130)
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Specification