Medical Devices, Drug Coatings and Methods for Maintaining the Drug Coatings Thereon

Abstract

Medical devices, and in particular implantable medical devices, may be coated to minimize or substantially eliminate a biological organism's reaction to the introduction of the medical device to the organism. The medical devices may be coated with any number of biocompatible materials. Therapeutic drugs, agents or compounds may be mixed with the biocompatible materials and affixed to at least a portion of the medical device. These therapeutic drugs, agents or compounds may also further reduce a biological organism's reaction to the introduction of the medical device to the organism. Various materials and coating methodologies may be utilized to maintain the drugs, agents or compounds on the medical device until delivered and positioned.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation application of copending U.S. Ser. No. 11 / 782,864, filed Jul. 25, 2007, which in turn is a continuation of copending U.S. Ser. No. 11 / 437,572, filed May 19, 2006, which is in turn a continuation of U.S. Ser. No. 10 / 636,435 filed Aug. 7, 2003, now U.S. Pat. No. 7,056,550, which is a continuation application of U.S. Ser. No. 09 / 962,496 filed Sep. 25, 2001, which is a continuation-in-part application of U.S. application Ser. No. 09 / 675,882, filed Sep. 29, 2000.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to the local administration of drug / drug combinations for the prevention and treatment of vascular disease, and more particularly to intraluminal medical devices for the local delivery of drug / drug combinations for the prevention and treatment of vascular disease caused by injury and methods for maintaining the drug / drug combinations on the intraluminal...

Examples

example 1

[0111] A PVDF homopolymer (Solef® 1008 from Solvay Advanced Polymers, Houston, Tex., Tm about 175° C.) and polyfluoro copolymers of poly(vinylidenefluoride / HFP), 92 / 8 and 91 / 9 weight percent vinylidenefluoride / HFP as determined by F19 NMR, respectively (eg: Solef® 11010 and 11008, Solvay Advanced Polymers, Houston, Tex., Tm about 159 degrees C. and 160 degrees C., respectively) were examined as potential coatings for stents. These polymers are soluble in solvents such as, but not limited to, DMAc, N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N-methylpyrrolidone (NMP), tetrahydrofuran (THF) and acetone. Polymer coatings were prepared by dissolving the polymers in acetone, at five weight percent as a primer, or by dissolving the polymer in 50 / 50 DMAc / acetone, at thirty weight percent as a topcoat. Coatings that were applied to the stents by dipping and dried at 60 degrees C. in air for several hours, followed by 60 degrees C. for three hours in a <100 mm Hg vacuum, resulted...

example 2

[0112] A polyfluoro copolymer (Solef® 21508) comprising 85.5 weight percent vinylidenefluoride copolymerized with 14.5 weight percent HFP, as determined by F19 NMR, was evaluated. This copolymer is less crystalline than the polyfluoro homopolymer and copolymers described in Example 1. It also has a lower melting point reported to be about 133 degrees C. Once again, a coating comprising about twenty weight percent of the polyfluoro copolymer was applied from a polymer solution in 50 / 50 DMAc / MEK. After drying (in air) at 60 degrees C. for several hours, followed by 60 degrees C. for three hours in a <100 mtorr Hg vacuum, clear adherent films were obtained. This eliminated the need for a high temperature heat treatment to achieve high quality films. Coatings were smoother and more adherent than those of Example 1. Some coated stents that underwent expansion show some degree of adhesion loss and “tenting” as the film pulls away from the metal. Where necessary, modification of coatings c...

example 3

[0114] Polyfluoro copolymers of still higher HFP content were then examined. This series of polymers were not semicrystalline, but rather are marketed as elastomers. One such copolymer is Fluorel™ FC2261Q (from Dyneon, a 3M-Hoechst Enterprise, Oakdale, Minn.), a 60.6 / 39.4 (wt / wt) copolymer of vinylidenefluoride / HFP. Although this copolymer has a Tg well below room temperature (Tg about minus twenty degrees C.) it is not tacky at room temperature or even at sixty degrees C. This polymer has no detectable crystallinity when measured by Differential Scanning Calorimetry (DSC) or by wide angle X-ray diffraction. Films formed on stents as described above were non-tacky, clear, and expanded without incident when the stents were expanded.

[0115] The coating process above was repeated, this time with coatings comprising the 60.6 / 39.4 (wt / wt) (vinylidenefluoride / HFP) and about nine, thirty and fifty weight percent of rapamycin (Wyeth-Ayerst Laboratories, Philadelphia, Pa.), based on total we...

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation application of copending U.S. Ser. No. 11 / 782,864, filed Jul. 25, 2007, which in turn is a continuation of copending U.S. Ser. No. 11 / 437,572, filed May 19, 2006, which is in turn a continuation of U.S. Ser. No. 10 / 636,435 filed Aug. 7, 2003, now U.S. Pat. No. 7,056,550, which is a continuation application of U.S. Ser. No. 09 / 962,496 filed Sep. 25, 2001, which is a continuation-in-part application of U.S. application Ser. No. 09 / 675,882, filed Sep. 29, 2000.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to the local administration of drug / drug combinations for the prevention and treatment of vascular disease, and more particularly to intraluminal medical devices for the local delivery of drug / drug combinations for the prevention and treatment of vascular disease caused by injury and methods for maintaining the drug / drug combinations on the intraluminal...

Examples

example 1

[0111] A PVDF homopolymer (Solef® 1008 from Solvay Advanced Polymers, Houston, Tex., Tm about 175° C.) and polyfluoro copolymers of poly(vinylidenefluoride / HFP), 92 / 8 and 91 / 9 weight percent vinylidenefluoride / HFP as determined by F19 NMR, respectively (eg: Solef® 11010 and 11008, Solvay Advanced Polymers, Houston, Tex., Tm about 159 degrees C. and 160 degrees C., respectively) were examined as potential coatings for stents. These polymers are soluble in solvents such as, but not limited to, DMAc, N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N-methylpyrrolidone (NMP), tetrahydrofuran (THF) and acetone. Polymer coatings were prepared by dissolving the polymers in acetone, at five weight percent as a primer, or by dissolving the polymer in 50 / 50 DMAc / acetone, at thirty weight percent as a topcoat. Coatings that were applied to the stents by dipping and dried at 60 degrees C. in air for several hours, followed by 60 degrees C. for three hours in a <100 mm Hg vacuum, resulted...

example 2

[0112] A polyfluoro copolymer (Solef® 21508) comprising 85.5 weight percent vinylidenefluoride copolymerized with 14.5 weight percent HFP, as determined by F19 NMR, was evaluated. This copolymer is less crystalline than the polyfluoro homopolymer and copolymers described in Example 1. It also has a lower melting point reported to be about 133 degrees C. Once again, a coating comprising about twenty weight percent of the polyfluoro copolymer was applied from a polymer solution in 50 / 50 DMAc / MEK. After drying (in air) at 60 degrees C. for several hours, followed by 60 degrees C. for three hours in a <100 mtorr Hg vacuum, clear adherent films were obtained. This eliminated the need for a high temperature heat treatment to achieve high quality films. Coatings were smoother and more adherent than those of Example 1. Some coated stents that underwent expansion show some degree of adhesion loss and “tenting” as the film pulls away from the metal. Where necessary, modification of coatings c...

example 3

[0114] Polyfluoro copolymers of still higher HFP content were then examined. This series of polymers were not semicrystalline, but rather are marketed as elastomers. One such copolymer is Fluorel™ FC2261Q (from Dyneon, a 3M-Hoechst Enterprise, Oakdale, Minn.), a 60.6 / 39.4 (wt / wt) copolymer of vinylidenefluoride / HFP. Although this copolymer has a Tg well below room temperature (Tg about minus twenty degrees C.) it is not tacky at room temperature or even at sixty degrees C. This polymer has no detectable crystallinity when measured by Differential Scanning Calorimetry (DSC) or by wide angle X-ray diffraction. Films formed on stents as described above were non-tacky, clear, and expanded without incident when the stents were expanded.

[0115] The coating process above was repeated, this time with coatings comprising the 60.6 / 39.4 (wt / wt) (vinylidenefluoride / HFP) and about nine, thirty and fifty weight percent of rapamycin (Wyeth-Ayerst Laboratories, Philadelphia, Pa.), based on total we...

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