Patent ID: 8028646

Claim:
A system for use in coating at least one surface of a medical device, the system comprising: a particle source comprising a first source to provide a first liquid composition and a second source to provide a second liquid composition; a holding fixture operable to position a medical device in a defined volume, the defined volume being defined by an enclosure; a dispensing device configured to receive source material from the particle source and dispense a plurality of monodisperse coating particles into the defined volume, wherein the dispensing device comprises one or more nozzle structures, wherein each nozzle structure comprises at least a first and second opening terminating at a dispensing end thereof from which a plurality of monodisperse coating particles having an electrical charge applied thereto is dispensed, wherein the first opening is configured to provide a first flow of the first liquid composition at the dispensing end and the second opening is configured to provide a second flow of the second liquid composition at the dispensing end, and further wherein the first opening and second opening are concentric openings; and an electrode structure comprising an electrode isolated from the dispensing ends of the one or more nozzle structures, wherein the electrode structure is operable to create a nonuniform electrical field between the dispensing ends of the one or more nozzle structures and the medical device for use in providing the plurality of monodisperse coating particles in the defined volume, wherein the plurality of monodisperse coating particles have a nominal diameter of less than 10 micrometers and a geometrical standard deviation of less than 1.2, and further wherein the nonuniform electric field is operable to assist in moving a plurality of the coating particles towards the at least one surface of the medical device to form a coating thereon.