Biocompatible coating, medical device using the same and methods
First Claim
1. A method for treating a surface of a medical device to inhibit thrombosis comprising steps:
- functionalizing a surface of a medical device by contacting said surface with a low temperature plasma which surface is exposed to blood flow continuous with bodily blood circulation with a first reactive group, contacting said surface with an antithrombogenic agent capable of reacting with said first reactive group, and causing said antithrombogenic agent to react with said first reactive group to covalently bind said antithrombogenic agent to said surface to form a coating on said surface which coating is effective to inhibit the formation of thrombus when said surface is exposed to blood flow continuous with bodily blood circulation.
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Abstract
The invention involves using a plasma to functionalize a surface of medical devices such as catheters, particularly intracardial catheters, with covalently bound thermochemically reactive groups. The surface is further contacted with a bioactive agent, particularly antithrombogenic coatings, which is thermochemically covalently coupled to the reactive group to form a therapeutically effective coating. The selected bioactive agent is then covalently bound to the surface by thermochemical reaction with the surface reactive groups. In another embodiment, the functionalizing step comprises contacting the surface with a Langmuir-Blodgett film comprising an amphipathic compound and a bioactive agent and using a plasma to covalently crosslink the Langmuir-Blodgett film to the medical device surface and to the bioactive agent. Medical devices prepared by the subject methods are also provided.
140 Citations
22 Claims
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1. A method for treating a surface of a medical device to inhibit thrombosis comprising steps:
functionalizing a surface of a medical device by contacting said surface with a low temperature plasma which surface is exposed to blood flow continuous with bodily blood circulation with a first reactive group, contacting said surface with an antithrombogenic agent capable of reacting with said first reactive group, and causing said antithrombogenic agent to react with said first reactive group to covalently bind said antithrombogenic agent to said surface to form a coating on said surface which coating is effective to inhibit the formation of thrombus when said surface is exposed to blood flow continuous with bodily blood circulation. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 16)
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2. A method for treating a surface of a medical device to inhibit thrombosis comprising steps:
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contacting a surface of a medical device which surface is exposed to blood flow continuous with bodily blood circulation with a Langmuir-Blodgett film comprising an amphipathic compound; contacting said surface with an antithromobogenic agent; covalently crosslinking said antithrombogenic agent with said amphipathic compound; covalently crosslinking said amphipathic compound to said surface; to form a coating on said surface which coating is effective to inhibit the formation of thrombus when said surface is exposed to blood flow continuous with bodily blood circulation; wherein at least one of said crosslinking steps comprises contacting said surface with a low temperature plasma. - View Dependent Claims (12, 13, 14, 15)
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17. A method for treating a surface of a medical device to inhibit thrombosis comprising steps:
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contacting an antithrombogenic agent with a surface of a medical device which surface is exposed to blood flow continuous with bodily blood circulation;
thereaftercausing said antithrombogenic agent to become covalently bound to said surface using a low temperature plasma;
thereafter,washing said surface to remove from said surface any of said antithrombogenic agent which is not covalently bound to said surface;
thereafter,contacting said surface with a reagent capable of selectively, non-covalently binding said antithrombogenic agent; causing said reagent to become selectively and noncovalently bound to said antithrombogenic agent;
thereafter,washing said surface to remove from said surface any of said reagent which is not selectively bound to said antithrombogenic agent;
thereafter,detecting a radiative signal at an intensity which meets or exceeds a predetermined intensity, wherein a radiative signal at said predetermined intensity correlates with the presence of coating of a predetermined amount of said antithrombogenic agent covalently bound to said surface, said coating being effective to inhibit the formation of thrombus when said surface is exposed to blood flow continuous with bodily blood circulation. - View Dependent Claims (18)
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19. A method for treating a surface of a medical device to provide said surface with a therapeutic coating comprising steps:
functionalizing a surface of a medical device which surface is exposed to blood flow continuous with bodily blood circulation with a first reactive group using a low temperature plasma, contacting said surface with a bioactive agent capable of reacting with said first reactive group, and causing said bioactive agent to react with said first reactive group to covalently bind said bioactive agent to said surface to form a coating on said surface which coating is therapeutic when said surface is exposed to blood flow continuous with bodily blood circulation.
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20. A method for treating a surface of a medical device to provide said surface with a therapeutic coating comprising steps:
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contacting a surface of a medical device which surface is exposed to blood flow continuous with bodily blood circulation with a Langmuir-Blodgett film comprising an amphipathic compound; contacting said surface with an antithromobogenic agent; covalently crosslinking said bioactive agent with said amphipathic compound; covalently crosslinking said amphipathic compound to said surface; to form a coating on said surface which coating is effective to inhibit the formation of thrombus when said surface is exposed to blood flow continuous with bodily blood circulation; wherein at least one of said crosslinking steps comprises contacting said surface with a low temperature plasma.
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21. A method for treating a surface of a medical device to provide said surface with a therapeutic coating comprising steps:
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contacting an bioactive agent with a surface of a medical device which surface is exposed to blood flow continuous with bodily blood circulation;
thereaftercausing said bioactive agent to become covalently bound to said surface using a low temperature plasma;
thereafter,washing said surface to remove from said surface any of said bioactive agent which is not covalently bound to said surface;
thereafter,contacting said surface with a reagent capable of selectively, non-covalently binding said bioactive agent; causing said reagent to become selectively and noncovalently bound to said bioactive agent;
thereafter,washing said surface to remove from said surface any of said reagent which is not selectively bound to said bioactive agent;
thereafter,detecting a radiative signal at an intensity which meets or exceeds a predetermined intensity, wherein a radiative signal at said predetermined intensity correlates with the presence of coating of a predetermined amount of said bioactive agent covalently bound to said surface, said coating is therapeutic when said surface is exposed to blood flow continuous with bodily blood circulation.
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22. A method for treating a surface of a medical device to promote thrombosis comprising steps:
functionalizing a surface of a medical device by contacting said surface with a low temperature plasma which surface is exposed to blood not in continuous flow with bodily blood circulation with a first reactive group, contacting said surface with an thrombogenic agent capable of reacting with said first reactive group, and causing said thrombogenic agent to react with said first reactive group to covalently bind said thrombogenic agent to said surface to form a coating on said surface which is effective to promote the formation of thrombus when said surface is exposed to blood not in continuous flow with bodily blood circulation.
Specification