Medical device coatings for releasing a therapeutic agent at multiple rates
First Claim
1. A method of manufacturing a coated medical device comprising an implantable structure having a coated surface extending from a proximal end to a distal end, the method comprising:
- spraying first droplets of a solution having a first average liquid droplet size onto a first region of the surface, wherein the solution comprises a first therapeutic agent dissolved in a volatile solvent;
evaporating the volatile solvent from the first region to form a coating of the first therapeutic agent on the first region;
spraying second droplets of the solution having a second average liquid droplet size onto a second region of the surface;
evaporating the volatile solvent from the second region to form a coating of the first therapeutic agent on the second region,wherein the first average droplet size differs from the second average droplet size and wherein the first therapeutic agent elutes at a different rate from the first region than from the second region when the first and second regions are implanted in the vascular system of a subject.
1 Assignment
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Accused Products
Abstract
Medical device coatings are provided that simultaneously release a therapeutic agent at different rates from different portions of the medical device coating. In a first embodiment, medical device coatings are provided that include particles comprising a therapeutic agent with two or more different particles sizes within a single layer on a surface of the implantable device. In a second embodiment, medical device coatings are provided having a higher concentration of the therapeutic agent in a first region of the coating than in a second region of the coating. In a third embodiment, medical device coatings are provided that are formed by certain coating processes wherein the droplet size of a spray coating solution is changed during the coating process. These coating processes preferably include applying a solution comprising a therapeutic agent and a suitable solvent to a surface of an implantable medical device. In a fourth embodiment, methods of treatment are provided that include implanting a coated medical device.
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Citations
20 Claims
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1. A method of manufacturing a coated medical device comprising an implantable structure having a coated surface extending from a proximal end to a distal end, the method comprising:
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spraying first droplets of a solution having a first average liquid droplet size onto a first region of the surface, wherein the solution comprises a first therapeutic agent dissolved in a volatile solvent; evaporating the volatile solvent from the first region to form a coating of the first therapeutic agent on the first region; spraying second droplets of the solution having a second average liquid droplet size onto a second region of the surface; evaporating the volatile solvent from the second region to form a coating of the first therapeutic agent on the second region, wherein the first average droplet size differs from the second average droplet size and wherein the first therapeutic agent elutes at a different rate from the first region than from the second region when the first and second regions are implanted in the vascular system of a subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 19)
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17. A method of manufacturing a coated medical device having an implantable structure having an abluminal surface extending from a proximal end to a distal end, the method comprising:
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spraying first droplets of a solution having a first average liquid droplet size onto a first region of the abluminal surface, wherein the solution comprises paclitaxel dissolved in a volatile solvent; evaporating the volatile solvent from the first region to form a coating of the paclitaxel on the first region; spraying second droplets of the solution having a second average liquid droplet size onto a second region of the abluminal surface; evaporating the volatile solvent from the second region to form a coating of the paclitaxel on the second region, wherein the first average droplet size differs from the second average droplet size, wherein the implantable structure is selected from the group consisting of a stent and a balloon and wherein the paclitaxel on the first coating region elutes at least about 15% faster than the paclitaxel on second region when contacted with a porcine serum elution medium prepared by adding 0.104 mL of a 6.0 g/L heparin solution to porcine serum at 37°
C. and adjusting the pH to 5.6+/−
0.3 using a 20% v/v aqueous solution of acetic acid. - View Dependent Claims (18)
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20. A method of manufacturing a coated medical device comprising an implantable structure having a coated surface extending from a proximal end to a distal end, the method comprising:
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spraying first droplets having a first average liquid droplet size onto a first region of the surface, wherein the first droplets comprise a first therapeutic agent dissolved in a first volatile solvent; evaporating the first volatile solvent from the first region to form a coating of the first therapeutic agent on the first region; spraying second droplets having a second average liquid droplet size onto a second region of the surface, wherein the second droplets comprise the first therapeutic agent dissolved in a second volatile solvent; evaporating the second volatile solvent from the second region to form a coating of the first therapeutic agent on the second region, wherein the first average droplet size differs from the second average droplet size, wherein the first therapeutic agent elutes at a different rate from the first region than from the second region when the first and second regions are implanted in the vascular system of a subject and wherein the coating of first therapeutic agent on the first region and on the second region comprises less than 0.1 microgram/mm2 of materials other than the first therapeutic agent.
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Specification