Method of applying drug-release coatings

A - Human Necessities – 61 – L

Patent

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Details

A61L 27/00 (2006.01) A61K 47/48 (2006.01) A61L 31/04 (2006.01) A61L 31/10 (2006.01) A61L 31/16 (2006.01) A61L 33/00 (2006.01) A61F 2/00 (2006.01) A61F 2/06 (2006.01)

Patent

CA 2225096

The invention is directed to a method of applying drug-release coatings whereby a polymer can be dissolved in a first solvent (solvent A) to form a polymer system and a drug can be dissolved or suspended in a second solvent (solvent B) to form a drug system. The coating or layer of coating so formed comprises a substantially uniform combination of the drug and polymer. Solvent B can be the same as or different than solvent A. The coating can be applied on a stent body by separately spraying or dipping the polymer system and the drug system onto the devices. The coating can be accomplished by either applying the polymer and drug systems sequentially or simultaneously. In certain embodiments, a drug can be suspended in solvent B. In some cases, three or more systems can be utilized. For instance, a third system containing pure solvent A or B can smooth the coating surface, if the solvent of the third spraying system is compatible with the polymer matrix.

Mode d'application de revêtements libérant un médicament consistant à dissoudre un polymère dans un premier solvant (solvant A) pour former un système polymère, et à dissoudre ou à mettre en suspension un médicament dans un second solvant (solvant B) pour former un système médicamenteux. Le revêtement ou la couche d'enrobage ainsi obtenue sont composés d'une combinaison substantiellement uniforme du médicament et du polymère. Le solvant A et le solvant B peuvent être identiques ou différents. Le revêtement peut être appliqué sur le corps d'un stent en pulvérisant ou en immergeant séparément le système polymère et le système médicamenteux sur les dispositifs. On peut appliquer les systèmes polymères et médicamenteux soit successivement soit simultanément. Dans certaines présentations, un médicament peut être mis en suspension dans le solvant B. Dans certains cas, trois systèmes ou plus peuvent être utilisés. Par exemple, un troisième système contenant le solvant A ou B à l'état pur peut adoucir la surface du revêtement si le solvant du troisième système de pulvérisation est compatible avec la matrice polymère.

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