System and method for enhanced electrostatic deposition and surface coatings

Information

  • Patent Grant
  • 9687864
  • Patent Number
    9,687,864
  • Date Filed
    Friday, June 20, 2014
    9 years ago
  • Date Issued
    Tuesday, June 27, 2017
    6 years ago
Abstract
This disclosure describes the application of a supplemental corona source to provide surface charge on submicrometer particles to enhance collection efficiency and micro-structural density during electrostatic collection.
Description
FIELD OF THE INVENTION

The present invention relates generally to surface coatings and processes for making. More particularly, the invention relates to a system and method for enhancing charge of coating particles produced by rapid expansion of near-critical and supercritical solutions that improves quality of surface coatings.


BACKGROUND OF THE INVENTION

A high coating density is desirable for production of continuous thin films on surfaces of finished devices following post-deposition processing steps. Nanoparticle generation and electrostatic collection (deposition) processes that produce surface coatings can suffer from poor collection efficiencies and poor coating densities that result from inefficient packing of nanoparticles. Low-density coatings are attributed to the dendritic nature of the coating. “Dendricity” as the term is used herein is a qualitative measure of the extent of particle accumulations or fibers found on, the coating. For example, a high dendricity means the coating exhibits a fuzzy or shaggy appearance upon inspection due to fibers and particle accumulations that extend from the coating surface; the coating also has a low coating density. A low dendricity means the coating is smooth and uniform upon inspection and has a high coating density. New processes are needed that can provide coatings with a low degree of dendricity, suitable for use, e.g., on medical devices and other substrates.


SUMMARY OF THE INVENTION

Provided herein is a system for electrostatic deposition of particles upon a charged substrate to form a coating on a surface of the substrate, the system comprising: an expansion nozzle that releases coating particles having a first average electric potential suspended in a gaseous phase from a near-critical or supercritical fluid that is expanded through said nozzle; and an auxiliary emitter that generates a stream of charged ions having a second average potential in an inert carrier gas; whereby said coating particles interact with the charged ions and the carrier gas to enhance a charge differential between the coating particles and the substrate.


Provided herein is a system for electrostatic deposition of particles upon a charged substrate to form a coating on a surface of the substrate, the system comprising: an expansion nozzle that releases coating particles having a first average electric potential suspended in a gaseous phase from a near-critical or supercritical fluid that is expanded through the nozzle; and an auxiliary emitter that generates a stream of charged ions having a second average electric potential in an inert carrier gas; whereby the coating particles interact with the charged ions and the carrier gas to enhance a potential differential between the coating particles and the substrate.


In some embodiments, the coating particles have a first velocity upon release of the coating particles from the expansion nozzle that is less than a second velocity of the coating particles when the coating particles impact the substrate. In some embodiments, attraction of the coating particles to the substrate is increased as compared to attraction of the coating particles to the substrate in a system without the auxiliary emitter.


In some embodiments, the first average electric potential is different than the second average electric potential. In some embodiments, an absolute value of the first average electric potential is less than an absolute value of the second average electric potential, and wherein a polarity the charged ions is the same as a polarity of the coating particles.


In some embodiments, the auxiliary emitter comprises an electrode having a tapered end that extends into a gas channel that conducts the stream of charged ions in the inert carrier gas toward the charged coating particles. In some embodiments, the auxiliary emitter further comprises a capture electrode. In some embodiments, the auxiliary emitter comprises a metal rod with a tapered tip and a delivery orifice.


In some embodiments, the substrate is positioned in a circumvolving orientation around the expansion nozzle.


In some embodiments, the substrate comprises a conductive material. In some embodiments, the substrate comprises a semi-conductive material. In some embodiments, the substrate comprises a polymeric material.


In some embodiments, the charged ions at the second electric potential are a positive corona or a negative corona positioned between the expansion nozzle and the substrate. In some embodiments, the charged ions at the second electric potential are a positive corona or a negative corona positioned between the auxiliary emitter and the substrate.


In some embodiments, the coating particles comprises at least one of: polylactic acid (PLA); poly(lactic-co-glycolic acid) (PLGA); polycaprolactone (poly(e-caprolactone)) (PCL), polyglycolide (PG) or (PGA), poly-3-hydroxybutyrate; LPLA poly(l-lactide), DLPLA poly(dl-lactide), PDO poly(dioxolane), PGA-TMC, 85/15 DLPLG p(dl-lactide-co-glycolide), 75/25 DLPL, 65/35 DLPLG, 50/50 DLPLG, TMC poly(trimethylcarbonate), p(CPP:SA) poly(1,3-bis-p-(carboxyphenoxy)propane-co-sebacic acid) and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, and copolymers thereof.


In some embodiments, the coating particles comprise at least one of: polyester, aliphatic polyester, polyanhydride, polyethylene, polyorthoester, polyphosphazene, polyurethane, polycarbonate urethane, aliphatic polycarbonate, silicone, a silicone containing polymer, polyolefin, polyamide, polycaprolactam, polyamide, polyvinyl alcohol, acrylic polymer, acrylate, polystyrene, epoxy, polyethers, celluiosics, expanded polytetrafluoroethylene, phosphorylcholine, polyethyleneyerphthalate, polymethylmethavrylate, poly(ethylmethacrylate/n-butylmethacrylate), parylene-C, polyethylene-co-vinyl acetate, polyalkyl methacrylates, polyalkylene-co-vinyl acetate, polyalkylene, polyalkyl siloxanes, polyhydroxyalkanoate, polyfluoroalkoxyphasphazine, poly(styrene-b-isobutylene-b-styrene), poly-butyl methacrylate, poly-byta-diene, and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, and copolymers thereof.


In some embodiments, the coating particles have a size between about 0.01 micrometers and about 10 micrometers.


In some embodiments, the second velocity is in the range from about 0.1 cm/sec to about 100 cm/sec. In some embodiments, the coating has a density on the surface in the range from about 1 volume % to about 60 volume %.


In some embodiments, the coating is a multilayer coating. In some embodiments, the substrate is a medical implant. In some embodiments, the substrate is an interventional device. In some embodiments, the substrate is a diagnostic device. In some embodiments, the substrate is a surgical tool. In some embodiments, the substrate is a stent.


In some embodiments, the coating is non-dendritic as compared to a baseline average coating thickness. In some embodiments, no coating extends more than 0.5 microns from the baseline average coating thickness. In some embodiments, no coating extends more than 1 micron from the baseline average coating thickness.


In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 0.5 microns. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 1 micron. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 2 microns following sintering of the coated substrate. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 3 microns following sintering of the coated substrate.


Provided herein is a system for enhancing charge of solid coating particles produced from expansion of a near-critical or supercritical solution for electrostatic deposition upon a charged substrate as a coating. The system is characterized by: an expansion nozzle that releases charged coating particles having a first potential suspended in a gaseous phase from a near-critical or supercritical fluid that is expanded through the expansion nozzle; and an auxiliary emitter that generates a stream of selectively charged ions having a second potential in an inert carrier gas stream. Charged coating particles interact with charged ions in the gas stream to enhance a charge differential between the charged coating particles and the substrate. The substrate is positioned within an electric field and is subject to that field, which increases the velocity at which the charged coating particles impact the substrate. The auxiliary emitter includes a metal rod electrode having a tapered end that extends into a gas channel containing a flowing inert carrier gas. The auxiliary emitter further includes a counter-electrode that operates at a potential relative to the rod electrode. The counter-electrode may be in the form of a ring, with all points on the ring being equidistant from the tapered tip. The counter electrode can be grounded or oppositely charged. A corona is generated at the pointed tip of the tapered rod, emitting a stream of charged ions. The gas channel conducts the charged ions in the inert carrier gas into the deposition enclosure, where they interact with the coating particles produced by the fluid expansion process. The substrate to be coated by the coating particles may be positioned in a circumvolving orientation around the expansion nozzle. In one embodiment, the substrate is positioned on a revolving stage or platform that provides the circumvolving orientation around the expansion nozzle. Substrates can be individually rotated clockwise or counterclockwise through a rotation of 360 degrees. The substrate can include a conductive material, a metallic material, and/or a semi-conductive material. The coating that results on the substrate has: an enhanced surface coverage, an enhanced surface coating density, and minimized dendrite formation.


Provided herein is a method for forming a coating on a surface of a substrate, comprising: establishing an electric field between the substrate and a counter electrode; producing coating particles suspended in a gaseous phase of an expanded near-critical or supercritical fluid having an first average electric potential; and contacting the coating particles with a stream of charged ions at a second average potential in an inert carrier gas to increase the charge differential between the coating particles and the substrate.


Provided herein is a method for coating a surface of a substrate with a preselected material forming a coating, comprising the steps of: establishing an electric field between the substrate and a counter electrode; producing coating particles suspended in a gaseous phase of an expanded near-critical or supercritical fluid having an first average electric potential; and contacting the coating particles with a stream of charged ions at a second average potential in an inert carrier gas to increase the potential differential between the coating particles and the substrate.


In some embodiments, the coating particles have a first velocity upon release of the coating particles from the expansion nozzle that is less than a second velocity of the coating particles when the coating particles impact the substrate. In some embodiments, attraction of the coating particles to the substrate is increased as compared to attraction of the coating particles to the substrate in a system without the auxiliary emitter. In some embodiments, the first average electric potential is different than the second average electric potential. In some embodiments, an absolute value of the first average electric potential is less than an absolute value of the second average electric potential, and wherein a polarity the charged ions is the same as a polarity of the coating particles.


In some embodiments, the second velocity is in the range from about 0.1 cm/sec to about 100 cm/sec.


In some embodiments, the coating particles have a size between about 0.01 micrometers and about 10 micrometers.


In some embodiments, the substrate has a negative polarity and an enhanced charge of the coating particles following the contacting step is a positive charge; or wherein the substrate has a positive polarity and an enhanced charge of the coating particles following the contacting step is a negative charge.


In some embodiments, the contacting step comprises forming a positive corona or forming a negative corona positioned between the expansion nozzle and the substrate. In some embodiments, the contacting step comprises forming a positive corona or forming a negative corona positioned between the auxiliary emitter and the substrate.


In some embodiments, the coating has a density on the surface from about 1 volume % to about 60 volume %.


In some embodiments, the coating particles comprise at least one of: a polymer, a drug, a biosorbable material, a protein, a peptide, and a combination thereof.


In some embodiments, the coating particles comprises at least one of: polylactic acid (PLA); poly(lactic-co-glycolic acid) (PLGA); polycaprolactone (poly(e-caprolactone)) (PCL), polyglycolide (PG) or (PGA), poly-3 hydroxybutyrate; LPLA poly(l-lactide), DLPLA poly(dl-lactide), PDO poly(dioxolane), PGA-TMC, 85/15 DLPLG p(dl-lactide-co-glycolide), 75/25 DLPL, 65/35 DLPLG, 50/50 DLPLG, TMC poly(trimethylcarbonate), p(CPP:SA) poly(1,3-bis-p-(carboxyphenoxy)propane-co-sebacic acid) and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, and copolymers thereof. In some embodiments, the coating on the substrate comprises polylactoglycolic acid (PLGA) at a density greater than 5 volume %.


In some embodiments, the coating particles comprise at least one of: polyester, aliphatic polyester, polyanhydride, polyethylene, polyorthoester, polyphosphazene, polyurethane, polycarbonate urethane, aliphatic polycarbonate, silicone, a silicone containing polymer, polyolefin, polyamide, polycaprolactam, polyamide, polyvinyl alcohol, acrylic polymer, acrylate, polystyrene, epoxy, polyethers, celluiosics, expanded polytetrafluoroethylene, phosphorylcholine, polyethyleneyerphthalate, polymethylmethavrylate, poly(ethylmethacrylate/n-b utylmethacrylate), parylene-C, polyethylene-co-vinyl acetate, polyalkyl methacrylates, polyalkylene-co-vinyl acetate, polyalkylene, polyalkyl siloxanes, polyhydroxyalkanoate, polyfluoroalkoxyphasphazine, poly(styrene-b-isobutylene-b-styrene), poly-butyl methacrylate, poly-byta-diene, and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, and copolymers thereof.


In some embodiments, the coating particles include a drug comprising one or more of: rapamycin, biolimus (biolimus A9), 40-O-(2-Hydroxyethyl)rapamycin (everolimus), 40-O-Benzyl-rapamycin, 40-O-(4′-Hydroxymethyl)benzyl-rapamycin, 40-O-[4′-(1,2-Dihydroxyethyl)]benzyl rapamycin, 40-O-Allyl-rapamycin, 40-O-[3′-(2,2-Dimethyl-1,3-dioxolan-4(S)-yl)-prop-2′-en-1′-yl]-rapamycin, (2′:E,4′S)-40-O-(4′,5′-Dihydroxypent-2′-en-1′-yl) rapamycin 40-O-(2-Hydroxy)ethoxycar-bonylmethyl-rapamycin, 40-O-(3-Hydroxyl)propyl-rapamycin 40-O-(6-Hydroxyl)hexyl-rapamycin 40-O-[2-(2-Hydroxyl)ethoxy]ethyl-rapamycin 40-O-[(3S)-2,2-Dimethyldioxolan-3-yl]methyl-rapamycin, 40-O-[(2S)-2,3-Dihydroxyprop-1-yl]-rapamycin, 40-O-(2-Acetoxy)ethyl-rapamycin 40-O-(2-Nicotinoyloxy)ethyl-rapamycin, 40-O-[2-(N-Morpholino)acetoxy]ethyl-rapamycin 40-O-(2-N-Imidazolylacetoxy)ethyl-rapamycin, 40-O-[2-(N-Methyl-N′-piperazinyl)acetoxy]ethyl-rapamycin, 39-O-Desmethyl-39,40-O,O-ethylene-rapamycin, (26R)-26-Dihydro-40-O-(2-hydroxy)ethyl-rapamycin, 28-O-Methyl-rapamycin, 40-O-(2-Aminoethyl)-rapamycin, 40-O-(2-Acetaminoethyl)-rapamycin 40-O-(2-Nicotinamidoethyl)-rapamycin, 40-O-(2-(N-Methyl-imidazo-2′-ylcarbethoxamido)ethylrapamycin, 40-(2-Ethoxycarbonylaminoethyl)-rapamycin, 40-O-(2-Tolylsulfonamidoethyl)-rapamycin, 40-O-[2-(4′,5′-Dicarboethoxy-1′,2′,3′-triazol-1′-yl)-ethyl]-rapamycin, 42-Epi-(tetrazolyl)rapamycin (tacrolimus), 42-[3-hydroxy-2-(hydroxymethyl)-2-methylpropanoate]rapamycin (temsirolimus), (42S)-42-Deoxy-42-(1H-tetrazol-1-yl)-rapamycin (zotarolimus), and salts, derivatives, isomers, racemates, diastereoisomers, prodrugs, hydrate, ester, or analogs thereof.


In some embodiments, the second velocity is in the range from about 0.1 cm/sec to about 100 cm/sec.


In some embodiments, the method further includes the step of sintering the coating at a temperature in the range from about 25° C. to about 150° C. to form a dense, thermally stable film on the surface of the substrate.


In some embodiments, the method further includes the step of sintering the coating in the presence of a solvent gas to form the dense, thermally stable film on the surface of the substrate.


In some embodiments, the producing and the contacting steps, at least, are repeated to form a multilayer film.


In some embodiments, the substrate is at least a portion of a medical implant. In some embodiments, the substrate is an interventional device. In some embodiments, the substrate is a diagnostic device. In some embodiments, the substrate is a surgical tool. In some embodiments, the substrate is a stent. In some embodiments, the substrate is a medical balloon.


In some embodiments, the coating is non-dendritic as compared to a baseline average coating thickness. In some embodiments, no coating extends more than 0.5 microns from the baseline average coating thickness. In some embodiments, no coating extends more than 1 micron from the baseline average coating thickness.


In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 0.5 microns. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 1 micron. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 2 microns following sintering of the coated substrate. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 3 microns following sintering of the coated substrate.


Provided herein is a method for coating a surface of a substrate with a preselected material, forming a coating. The method includes the steps of: establishing an electric field between the substrate and a counter electrode; producing solid solute (coating) particles from a near-critical or supercritical expansion process at an average first electric potential that are suspended in a gaseous phase of the expanded near-critical or supercritical fluid; and contacting the solid solute (coating) particles with a stream of charged ions at a second potential in an inert carrier gas to increase the charge differential between the particles and the substrate, thereby increasing the velocity at which the solute particles impact upon the substrate. The charge differential increases the attraction of the charged particles for the substrate. The solid solute particles are thus accelerated through the electric field, which increases the velocity at which the solute particles impact the surface of the substrate. High impact velocity and enhanced coating efficiency of the coating particles produce a coating on the substrate with an optimized microstructure and a low surface dendricity. The charged coating particles have a size that may be between about 0.01 micrometers and 10 micrometers. In one embodiment, the substrate includes a negative polarity and the enhanced charge of the solid solute particles is a positive enhanced charge. In another embodiment, the substrate includes a positive polarity and the enhanced charge of the solid solute particles is a negative enhanced charge. The increase in charge differential increases the velocity of the solid solute particles through an electric field that increases the force of impact of the particles against the surface of the substrate. The method further includes the step of sintering the coating that is formed during the deposition/collection process to form a thermally stable continuous film on the substrate, e.g., as detailed in U.S. Pat. No. 6,749,902, incorporated herein in its entirety. Various sintering temperatures and/or exposure to a gaseous solvent can be used. In some embodiments, sintering temperatures for forming dense, thermally stabile from the collected coating particles are selected in the range from about 25° C. to about 150° C. In one embodiment described hereafter, the invention is used to deposit biodegradable polymer and/or other coatings to surfaces that are used to produce continuous layers or films, e.g., on biomedical and/or drug-eluting devices (e.g., medical stents), and/or portions of medical devices. The coatings can also be applied to other medical devices and components including, e.g., medical implant devices such as, e.g., stents, medical balloons, and other biomedical devices.


Provided herein is a coating on a surface of a substrate produced by any of the methods described herein. Provided herein is a coating on a surface of a substrate produced by any of the systems described herein.


The final film from the coating can be a single layer film or a multilayer film. For example, the process steps can be repeated one or more times and with various materials to form a multilayer film on the surface of the substrate. In one embodiment, the medical device is a stent. In another embodiment, the substrate is a conductive metal stent. In yet another embodiment, the substrate is a non-conductive polymer medical balloon. The coating particles include materials that consist of: polymers, drugs, biosorbable materials, proteins, peptides, and combinations of these materials. In various embodiments, impact velocities at which the charged coating particles impact the substrate are from about 0.1 cm/sec to about 100 cm/sec. In some embodiments, the polymer that forms the solute particles is a biosorbable organic polymer and the supercritical fluid solvent includes a fluoropropane. In one embodiment, the coating is a polylactoglycolic acid (PLGA) coating that includes a coating density greater than (>) about 5 volume %.


In one embodiment, the charged ions at the selected potential are a positive corona positioned between an emission location and a deposition location of the substrate. In another embodiment, the charged ions at the selected potential are a negative corona positioned between an emission location and a deposition location of the substrate.


While the invention is described herein with reference to high-density coatings deposited onto medical device surfaces, in particular, stent surfaces, the invention is not limited thereto. All substrates as will be envisioned by those of ordinary skill in the art in view of the disclosure are within the scope of the invention. No limitations are intended.





BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1 is an optical micrograph showing an embodiment dendritic coating produced by the e-RESS process that does not include the auxiliary emitter and charged ions described herein.



FIG. 2 is a schematic diagram of one embodiment of the invention.



FIG. 3A is a top perspective view of a base platform that includes a RESS expansion nozzle, according to an embodiment of an invention.



FIG. 3B is a second top perspective view of a base platform that includes a RESS expansion nozzle, with an inner view of the rotating stage.



FIG. 4 shows an e-RESS system that includes an embodiment of the invention.



FIG. 5 shows exemplary process steps for coating a substrate, according to an embodiment of the process of the invention.



FIG. 6 is an optical micrograph showing an embodiment non-dendritic coating produced by an enhanced e-RESS coating process as described herein.





DETAILED DESCRIPTION

The invention is a system and method for enhancing electrostatic deposition of charged particles upon a charged substrate forming nanoparticle coatings. The invention improves collection efficiency, microstructure, and density of coatings, which minimizes dendricity of the coating on the selected substrate. Solid solute (coating) particles are generated from near-critical and supercritical solutions by a process of Rapid Expansion of (near-critical or) Supercritical Solutions, known as the RESS process.


The term “e-RESS” refers to the process for forming coatings by electrostatically collecting RESS expansion particles.


The term “near-critical fluid” as used herein means a fluid that is a gas at standard temperature and pressure (i.e., STP) and presently is at a pressure and temperature below the critical point, and where the fluid density exceeds the critical density (ρc).


The term “supercritical fluid” means a fluid at a temperature and pressure above its critical point. The invention finds application in the generation and efficient collection of these particles producing coatings with a low dendricity, e.g., for deposition on medical stents and other devices.


Various aspects of the RESS process are detailed in U.S. Pat. Nos. 4,582,731; 4,734,227; 4,734,451; 6,749,902; and 6,756,084 assigned to Battelle Memorial Institute, which patents are incorporated herein in their entirety.


Solid solute particles produced by the invention are governed by various electrostatic effects, the fundamentals of which are detailed, e.g., in “Aerosol Technology: Properties, Behavior, and Measurement of Airborne Particles” (William C. Hinds, Author, John Wiley & Sons, Inc., New York, N.Y., Ch. 15, Electrical Properties, pp. 284-314, 1982).


Embodiments of the invention comprise an auxiliary emitter and/or a process of using the same that enhances charge of RESS-generated coating particles, which improves the collection efficiency and deposition. The auxiliary emitter delivers a corona that enhances the charge of the solid solute particles. The term “corona” as used herein means an emission of charged ions accompanied by ionization of the surrounding atmosphere. Both positive and negative coronas may be used with the invention, as detailed further herein. Fundamentals of electrostatic processes including formation of coronal discharges are detailed, e.g., in the “Encyclopedia of Electrical and Electronics Engineering” (John Wiley & Sons, Inc., John G. Webster (Editor), Volume 7, Electrostatic Processes, 1999, pp. 15-39), which reference is incorporated herein. The enhanced charge further increases the velocity of impact of the coating particles on a selected substrate, improving the collection efficiency on the coating surface. The term “coating” as used herein refers to one or more layers of electrostatically-deposited coating particles on a substrate or surface.


Embodiments of the invention enhance the charge and collection efficiency of the coating particles that improves the microstructure, weight, and/or the coating density, which minimizes formation of dendrites during the deposition process. Thus, the quality of the particle coating on the substrate is enhanced. When sintered, the coating particles subsequently coalesce to form a continuous, uniform, and thermally stable film.


The invention thus produces high-density coatings that when deposited on various substrate surfaces are amenable to sintering into high quality films. The term “high density” as used herein means an electrostatic near-critical or supercritical solution-expanded (RESS) coating on a substrate having a coating density of from about 1 volume % to about 60 volume %, and the coating has a low-surface dendricity rating at or below 1 as measured, e.g., from a cross-sectional view of the coating and the substrate by scanning-electron micrograph (SEM). The term “volume %” is defined herein as the ratio of the volume of solids divided by the total volume times 100.


Another definition of a coating that is “high density” as described herein (or systems comprising such coatings, or processes producing such coating) includes a test for packing density of the coating in which the coating is determined to be non-dendritic as compared to a baseline average coating thickness for substrates coated at the same settings. That is, for a particular coating process set of settings for a given substrate (before sintering), a baseline average coating thickness is determined by determining and averaging coating thickness measurements at multiple locations (e.g. 3 or more, 5 or more, 9 or more, 10 or more) and for several substrates (if possible). The baseline average coating thickness and/or measurement of any coated substrate prior to sintering may be done, for example, by SEM or another visualization method having the ability to measure and visualize to the coating with accuracy, confidence and/or reliability.


Once the average is determined, for coatings on substrates coated at such settings can be compared to the average coating thickness for these settings. Multiple locations of the substrate may be tested to ensure the appropriate confidence and/or reliability. In some embodiments, a “non-dendritic”coating has no coating that extends more than 1 micron from the average coating thickness. In some embodiments, a “non-dendritic” coating has no coating that extends more than 0.5 microns from the average coating thickness. In some embodiments, a “non-dendritic” coating has no coating that extends more than 1.5 microns from the average coating thickness. In some embodiments, a “non-dendritic” coating has no coating that extends more than 2 microns from the average coating thickness. In some embodiments, a “dendritic” coating has coating that extends more than 0.5 microns from the average coating thickness. In some embodiments, a “dendritic” coating has coating that extends more than 1 micron from the average coating thickness. In some embodiments, a “dendritic” coating has coating that extends more than 1.5 microns from the average coating thickness. In some embodiments, a “dendritic” coating has coating that extends more than 2 microns from the average coating thickness.


In some embodiments, the number of sample locations on the coated substrate is chosen to ensure 90% confidence and 90% reliability that the coating is non-dendritic. In some embodiments, the number of sample locations on the coated substrate is chosen to ensure 95% confidence and 90% reliability that the coating is non-dendritic. In some embodiments, the number of sample locations on the coated substrate is chosen to ensure 95% confidence and 95% reliability that the coating is non-dendritic. In some embodiments, the number of sample locations on the coated substrate is chosen to ensure 99% confidence and 95% reliability that the coating is non-dendritic. In some embodiments, the number of sample locations on the coated substrate is chosen to ensure 99% confidence and 99% reliability that the coating is non-dendritic.


In some embodiments, at least 9 sample locations are reviewed, three at about a first end, 3 at about the center of the substrate, and 3 at about a second end of a substrate, and if none of the locations exceed the specification (e.g., greater than 2 microns from the average, greater than 1.5 microns from the average, greater than 1 micron from the average, or greater than 0.5 microns from the average), then the coating is non-dendritic. In some embodiments, the entire substrate is reviewed and compared to the average coating thickness to ensure the coating is non-dendritic.


In some embodiments, each substrate is compared to its own average coating thickness, and not that of other substrates processed at the same or similar coating process settings.


In embodiments where multiple coating layers are created on a substrate, with a sintering step following each coating, this test may be performed following any particular coating step just prior to sintering. The variability in coating thickness of a previous sintered layer may (or may not) be accounted for in the calculations such that a second and/or subsequent layer may allow for greater variation from the average coating thickness and still be considered “non-dendritic.”


In some embodiments, a coated substrate (before sintering) is non-dendritic if there is no surface irregularity greater than 0.5 microns. That is, a measurement from the base (or trough) of the coating to a peak of the coating does not exceed 0.5 microns. In some embodiments, a coated substrate (before sintering) is non-dendritic if there is no surface irregularity greater than 1 micron. That is, a measurement from the base (or trough) of the coating to a peak of the coating does not exceed 1 micron. In some embodiments, a coated substrate (before sintering) is non-dendritic if there is no surface irregularity greater than 1.5 microns. That is, a measurement from the base (or trough) of the coating to a peak of the coating does not exceed 1.5 microns. In some embodiments, a coated substrate (before sintering) is non-dendritic if there is no surface irregularity greater than 2 microns. That is, a measurement from the base (or trough) of the coating to a peak of the coating does not exceed 2 microns. The entire substrate does not require review and testing for these to be met, rather, as noted above, a sampling resulting in a particular confidence/reliability (for example, 90%/90%, 90%/95%, 95%/95%, 99%/95%, and/or 99%/99%) is sufficient.


In some embodiments, a coated substrate (post sintering) is non-dendritic if there is no surface irregularity greater than 2 microns. That is, a measurement from the base (or trough) of the coating to a peak of the coating does not exceed 2 microns if measured after sintering. In some embodiments, a coated substrate (post sintering) is non-dendritic if there is no surface irregularity greater than 2.5 microns. That is, a measurement from the base (or trough) of the coating to a peak of the coating does not exceed 2.5 microns if measured after sintering. In some embodiments, a coated substrate (post sintering) is non-dendritic if there is no surface irregularity greater than 3 microns. That is, a measurement from the base (or trough) of the coating to a peak of the coating does not exceed 3 microns if measured after sintering. The entire substrate does not require review and testing for these to be met, rather, as noted above, a sampling resulting in a particular confidence/reliability (for example, 90%/90%, 90%/95%, 95%/95%, 99%/95%, and/or 99%/99%) is sufficient. In embodiments where multiple coating layers are created on a substrate, with a sintering step following each coating, this confidence/reliability testing may be performed following any particular sintering step. No limitations are intended.


For example, FIG. 1 shows a coated substrate (100× magnification) with a dendritic coating (PLGA), where the average thickness of the coating is about 25 microns, and where the coating extends greater than 10 microns from this average. The dendritic coating also shows a surface irregularity, from a trough to a peak, greater than 25 microns. The dendritic coating was produced by a Rapid Expansion of Supercritical Solution (RESS) process that does not include use of the auxiliary emitter and charged ions described herein. FIG. 6 (described further herein) shows a coated substrate (160× magnification) with a non-dendritic coating, where the average thickness is about 10 microns, and where no coating extends greater than 1 micron from this average. The non-dendritic coating also shows no surface irregularity greater than 2 microns, from a trough to a peak. The non-dendritic coating was produced by an electrostatic Rapid Expansion of Supercritical Solution (e-RESS) process that includes use of an auxiliary emitter and charged ions described herein.


The term “sintering” used herein refers to processes—with or without the presence of a gas-phase solvent to reduce sintering temperature—whereby e-RESS particles initially deposited as a coating coalesce, forming a continuous dense, thermally stable film on a substrate. Coatings can be sintered by the process of heat-sintering at selected temperatures described herein or alternatively by gas-sintering in the presence of a solvent gas or supercritical fluid as detailed, e.g., in U.S. Pat. No. 6,749,902, which patent is incorporated herein in its entirety. The term “film” as used herein refers to a continuous layer produced on the surface after sintering of an e-RESS-generated coating.


Embodiments of the invention find application in producing coatings of devices including, e.g., medical stents that are coated, e.g., with time-release drugs for time-release drug applications. These and other enhancements and applications are described further herein. While the process of coating in accordance with the invention will be described in reference to the coating of medical stent devices, it should be strictly understood that the invention is not limited thereto. The person or ordinary skill in the art will recognize that the invention can be used to coat a variety of substrates for various applications. All coatings as will be produced by those of ordinary skill in view of the disclosure are within the scope of the invention. No limitations are intended.



FIG. 2 is a schematic diagram of an auxiliary emitter 100, according to an embodiment of the invention. Auxiliary emitter 100 is a charging device that enhances the charge of solid solute (coating) particles formed by the e-RESS process. The enhanced charge transferred to the coating particles increases the impact velocity of the particles on the substrate surface. e-RESS-generated coating particles that form on the surface of the substrates when utilizing auxiliary emitter 100 have enhanced surface coverage, enhanced surface coating density, and lower dendricity than coatings produced without it. In the exemplary embodiment, auxiliary emitter 100 includes a metal rod 12 (e.g., ⅛-inch diameter), as a first auxiliary electrode 12, configured with a tapered or pointed tip 13. Tip 13 provides a site where charged ions (corona) are generated. The charged ions are subsequently delivered to the deposition vessel, described further herein in reference to FIG. 4. In the exemplary embodiment, rod 12 is grounded (i.e., has a zero potential), but is not limited thereto. For example, in an alternate implementation, emitter tip 13 of rod 12 has a high potential. No limitations are intended. Emitter 100 further includes a collector 16, or second auxiliary electrode 16, of a ring or circular counter-electrode design (e.g., ⅛-inch diameter, 0.75 I.D. copper) that is required for formation of the corona at the tapered tip 13, but the invention is not limited thereto. Emitter 100 further includes a gas channel 22 that receives a flow of inert carrier gas (e.g., dry nitrogen or another dry gas having a relative humidity of about 0 wherein “about” allows for variations of 1% maximum, 0.5% maximum, 0.25% maximum, 0.1% maximum, 0.01% maximum, and/or 0.001% maximum) delivered through gas inlet 24 at a preselected rate and pressure (e.g., 4.5 L/min @ 20 psi). Rate and pressures are not limited. Emitter tip 13 extends a preselected distance (e.g., 1 cm to 2 cm) into gas channel 22, which distance can be varied to establish a preselected current between rod 12 and collector 16. A flow of inert gas through channel 22 carries charged ions produced by the corona through orifice 14 into the deposition vessel (FIG. 4). In a typical run, a potential of about 5 kV (+ or −) is applied to collector 16, which establishes a current of 1 microamperes (μA) at the 1 cm distance from tip 13, but distance and potential are not limited thereto as will be understood by those of ordinary skill in the electrical arts. For example, distance and potentials are selected and applied such that high currents sufficient to maximize charge delivered to the deposition vessel are generated. In various embodiments, currents can be selected in the range from about 0.05 μA to about 10 μA. Thus, no limitations are intended.


In the instant embodiment, collector 16 is positioned within auxiliary body 18. Auxiliary body 18 inserts into, and couples snugly with, base portion 20, e.g., via two (2) O-rings 19 composed of, e.g., a fluoroelastomer (e.g., VITON®, DuPont, Wilmington, Del., USA), or another suitable material positioned between auxiliary body 18 and base portion 20. Base portion 20 is secured to the deposition vessel (FIG. 4) such that auxiliary body 18 can be detached from base portion 20. The detachability of auxiliary body 18 from base portion 20 allows for cleaning of auxiliary electrodes 12, 16. Auxiliary body 18 and base portion 20 are composed of, e.g., a high tensile-strength machinable polymer (e.g., polyoxymethylene also known as DELRIN®, DuPont, Wilmington, Del., USA) or another structurally stable, insulating material. Auxiliary body 18 and base 20 can be constructed as individual components or collectively as a single unit. No limitations are intended. Gas channel 22 is located within auxiliary body 18 to provide a flow of inert gas (e.g., dry nitrogen or another dry gas having a relative humidity of about 0 wherein “about” allows for variations of 1% maximum, 0.5% maximum, 0.25% maximum, 0.1% maximum, 0.01% maximum, and/or 0.001% maximum) that sweeps charged ions generated in emitter 100 into the deposition vessel (FIG. 4) and further minimizes coating particles from coating emitter tip 13 during the coating run. Auxiliary body 18 further includes a conductor element 26 positioned within a conductor channel 25 that provides coupling between collector 16 and a suitable power supply (not shown). Configuration of power coupling components is exemplary and is not intended to be limiting. For example, other electrically-conducting and/or electrode components as will be understood by those of ordinary skill in the electrical arts can be coupled without limitation.



FIG. 3 is a top perspective view of a RESS base portion 80 (base), according to an embodiment of the invention. RESS base portion 80 includes an expansion nozzle assembly 32, equipped with a spray nozzle orifice 36. In standard mode, nozzle orifice 36 releases a plume of expanding supercritical or near-critical solution containing at least one solute (e.g., a polymer, drug, or other combinations of materials) dissolved within the supercritical or near-critical solution. During the RESS process, the solution expands through nozzle assembly 32 forming solid solute particles of a suitable size that are released through nozzle orifice 36. While release is described, e.g., in an upward direction, direction of release of the plume is not limited. Nozzle orifice 36 can also deliver a plume of charged coating particles absent the expansion solvent, e.g., as an electrostatic dry powder, which process is detailed in patent publication number WO 2007/011707 A2 (assigned to MiCell Technologies, Inc., Raleigh, N.C., USA), which reference is incorporated herein in its entirety. In the instant embodiment, nozzle assembly 32 includes a metal sheath 44 as a first e-RESS electrode 44 (central post electrode 44) that surrounds an insulator 42 material (e.g., DELRIN®) to separate metal sheath 44 from nozzle orifice 36. First e-RESS electrode 44 may be grounded so as to have no detectable current, but is not limited thereto as described herein. Expansion nozzle assembly 32 is mounted at the center of a rotating stage 40 and positioned equidistant from the metal stents (substrates) 34 mounted to stage 40, but position in the exemplary device is not intended to be limiting. Stents 34 serve collectively as a second e-RESS electrode 34. A metal support ring (not shown) underneath stage 40 extends around the circumference of stage 40 and couples to the output of a high voltage, low current DC power supply (not shown) via a cable (not shown) fed through stage 40. The end of the cable is connected to the metal support ring and to stage mounts 38 into which stents 34 are mounted on stage 40. The power supply provides power for charging of substrates 34 (stents 34). Stents 34 are mounted about the circumference along an arbitrary line of stage 40, but mounting position is not limited. Stents 34 are suspended above stage 40 on wire holders 46 (e.g., 316-Stainless steel) that run through the center of each stent 34. Stents 34 positioned on wire holders 46 are supported on holder posts 45 that insert into individual stage mounts 38 on stage 40. A plastic bead (disrupter) 48 is placed at the top end of each wire holder 46 to prevent coronal discharge and to maintain a proper electric field and for proper formation of the coating on each stent 34. Mounts 38 rotate through 360 degrees, providing rotation of individual stents 34. Stage 40 also rotates through 360 degrees. Two small DC-electric motors (not shown) installed underneath stage 40 provide rotation of individual substrates 34 (stents 34) and rotation of stage 40, respectively. Rate at which stents 34 are rotated may be about 10 revolutions per minute to provide for uniform coating during the coating process, but rate and manner of revolution is not limited thereto. Stage 40 also rotates in some embodiments at a rate of about 10 revolutions per minute during the coating process, but rate and manner of revolution are again not limited thereto. Rotation of mounts 38 and stage 40 at preselected rates can be performed by various methods as will be understood by those of ordinary skill in the mechanical arts. No limitations are intended. Rotation of both stage 40 and stents 34 provides uniform and maximum exposure of each stent 34 or substrate surface to the coating particles delivered from RESS nozzle assembly 32. Location of expansion nozzle assembly 32 is not limited, and is selected such that a suitable electric field is established between nozzle assembly 32 and stents 34. Thus, configuration is not intended to be limited. A typical operating voltage applied to stents 34 is −15 kV. Stage 40 is fabricated from an engineered thermoplastic or insulating polymer having excellent strength, stiffness, and dimensional stability, including, e.g., polyoxymethylene (also known by the trade name DELRIN®, DuPont, Wilmington, Del., USA), or another suitable material, e.g., as used for the manufacture of precision parts, which materials are not intended to be limited.


System for Deposition of e-RESS-Generated Particles for Coating Surfaces

Provided herein is a system for electrostatic deposition of particles upon a charged substrate to form a coating on a surface of the substrate, the system comprising: an expansion nozzle that releases coating particles having a first average electric potential suspended in a gaseous phase from a near-critical or supercritical fluid that is expanded through the nozzle; and an auxiliary emitter that generates a stream of charged ions having a second average potential in an inert carrier gas; whereby the coating particles interact with the charged ions and the carrier gas to enhance a charge differential between the coating particles and the substrate.


Provided herein is a system for electrostatic deposition of particles upon a charged substrate to form a coating on a surface of the substrate, the system comprising: an expansion nozzle that releases coating particles having a first average electric potential suspended in a gaseous phase from a near-critical or supercritical fluid that is expanded through the nozzle; and an auxiliary emitter that generates a stream of charged ions having a second average electric potential in an inert carrier gas; whereby the coating particles interact with the charged ions and the carrier gas to enhance a potential differential between the coating particles and the substrate.


In some embodiments, the coating particles have a first velocity upon release of the coating particles from the expansion nozzle that is less than a second velocity of the coating particles when the coating particles impact the substrate. In some embodiments, attraction of the coating particles to the substrate is increased as compared to attraction of the coating particles to the substrate in a system without the auxiliary emitter.


In some embodiments, the first average electric potential is different than the second average electric potential. In some embodiments, an absolute value of the first average electric potential is less than an absolute value of the second average electric potential, and wherein a polarity the charged ions is the same as a polarity of the coating particles.


In some embodiments, the auxiliary emitter comprises an electrode having a tapered end that extends into a gas channel that conducts the stream of charged ions in the inert carrier gas toward the charged coating particles. In some embodiments, the auxiliary emitter further comprises a capture electrode. In some embodiments, the auxiliary emitter comprises a metal rod with a tapered tip and a delivery orifice.


In some embodiments, the substrate is positioned in a circumvolving orientation around the expansion nozzle.


In some embodiments, the substrate comprises a conductive material. In some embodiments, the substrate comprises a semi-conductive material. In some embodiments, the substrate comprises a polymeric material.


In some embodiments, the charged ions at the second electric potential are a positive corona or a negative corona positioned between the expansion nozzle and the substrate. In some embodiments, the charged ions at the second electric potential are a positive corona or a negative corona positioned between the auxiliary emitter and the substrate.


In some embodiments, the coating particles comprises at least one of: polylactic acid (PLA); poly(lactic-co-glycolic acid) (PLGA); polycaprolactone (poly(e-caprolactone)) (PGL), polyglycolide (PG) or (PGA), poly-3-hydroxybutyrate; LPLA poly(l-lactide), DLPLA poly(dl-lactide), PDO poly(dioxolane), PGA-TMC, 85/15 DLPLG p(dl-lactide-co-glycolide), 75/25 DLPL, 65/35 DLPLG, 50/50 DLPLG, TMC poly(trimethylcarbonate), p(CPP:SA) poly(1,3-bis-p-(carboxyphenoxy)propane-co-sebacic acid) and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, and copolymers thereof.


In some embodiments, the coating particles comprise at least one of: polyester, aliphatic polyester, polyanhydride, polyethylene, polyorthoester, polyphosphazene, polyurethane, polycarbonate urethane, aliphatic polycarbonate, silicone, a silicone containing polymer, polyolefin, polyamide, polycaprolactam, polyamide, polyvinyl alcohol, acrylic polymer, acrylate, polystyrene, epoxy, polyethers, celluiosics, expanded polytetrafluoroethylene, phosphorylcholine, polyethyleneyerphthalate, polymethylmethavrylate, poly(ethylmethacrylate/n-butylmethacrylate), parylene C, polyethylene-co-vinyl acetate, polyalkyl methacrylates, polyalkylene-co-vinyl acetate, polyalkylene, polyalkyl siloxanes, polyhydroxyalkanoate, polyfluoroalkoxyphasphazine, poly(styrene-b-isobutylene-b-styrene), poly-butyl methacrylate, poly-byta-diene, and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, and copolymers thereof.


In some embodiments, the coating particles include a drug comprising one or more of: rapamycin, biolimus (biolimus A9), 40-O-(2-Hydroxyethyl)rapamycin (everolimus), 40-O-Benzyl-rapamycin, 40-O-(4′-Hydroxymethyl)benzyl-rapamycin, 40-O-[4′-(1,2-Dihydroxyethyl)]benzyl-rapamycin, 40-O-Allyl-rapamycin, 40-O-[3′-(2,2-Dimethyl-1,3-dioxolan-4(S)-yl)-prop-2′-en-1′-yl]-rapamycin, (2′:E,4′S)-40-O-(4′,5′-Dihydroxypent-2′-en-1′-yl)-rapamycin 40-O-(2-Hydroxy)ethoxycar-bonylmethyl-rapamycin, 40-O-(3-Hydroxyl)propyl-rapamycin 40-O-(6-Hydroxyl)hexyl-rapamycin 40-O-[2-(2-Hydroxyl)ethoxy]ethyl-rapamycin 40-O-[(3S)-2,2-Dimethyldioxolan-3-yl]methyl-rapamycin, 40-O-[(2S)-2,3-Dihydroxyprop-1-yl]-rapamycin, 40-O-(2-Acetoxy)ethyl-rapamycin 40-O-(2-Nicotinoyloxy)ethyl-rapamycin, 40-O-[2-(N-Morpholino)acetoxy]ethyl-rapamycin 40-O-(2-N-Imidazolylacetoxy)ethyl-rapamycin, 40-O-[2-(N-Methyl-N′-piperazinyl)acetoxy]ethyl-rapamycin, 39-O-Desmethyl-39,40-O,O-ethylene-rapamycin, (26R)-26-Dihydro-40-O-(2-hydroxyl)ethyl-rapamycin, 28-O-Methyl-rapamycin, 40-O-(2-Aminoethyl)-rapamycin, 40-O-(2-Acetaminoethyl)-rapamycin 40-O-(2-Nicotinamidoethyl)-rapamycin, 40-O-(2-(N-Methyl-imidazo-2′-ylcarbethoxamido)ethylrapamycin, 40-O-(2-Ethoxycarbonylaminoethyl)-rapamycin, 40-O-(2-Tolylsulfonamidoethyl)-rapamycin, 40-O-[2-(4′,5′-Dicarboethoxy-1′,2′,3′-triazol-1′-yl)-ethyl]rapamycin, 42-Epi-(tetrazolyl)rapamycin (tacrolimus), 42-[3-hydroxy-2-(hydroxymethyl)-2-methylpropanoate]rapamycin (temsirolimus), (42S)-42-Deoxy-42-(1H-tetrazol-1-yl)-rapamycin (zotarolirnus), and salts, derivatives, isomers, racemates, diastereoisomers, prodrugs, hydrate, ester, or analogs thereof.


In some embodiments, the coating particles have a size between about 0.01 micrometers and about 10 micrometers.


In some embodiments, the second velocity is in the range from about 0.1 cm/sec to about 100 cm/sec. In some embodiments, the coating has a density on the surface in the range from about 1 volume % to about 60 volume %.


In some embodiments, the coating is a multilayer coating. In some embodiments, the substrate is a medical implant. In some embodiments, the substrate is an interventional device. In some embodiments, the substrate is a diagnostic device. In some embodiments, the substrate is a surgical tool. In some embodiments, the substrate is a stent.


Medical implants may comprise any implant for insertion into the body of a human or animal subject, including but not limited to stents (e.g., coronary stents, vascular stents including peripheral stents and graft stents, urinary tract stents, urethral/prostatic stents, rectal stent, oesophageal stent, biliary stent, pancreatic stent), electrodes, catheters, leads, implantable pacemaker, cardioverter or defibrillator housings, joints, screws, rods, ophthalmic implants, femoral pins, bone plates, grafts, anastomotic devices, perivascular wraps, sutures, staples, shunts for hydrocephalus, dialysis grafts, colostomy bag attachment devices, ear drainage tubes, leads for pace makers and implantable cardioverters and defibrillators, vertebral disks, bone pins, suture anchors, hemostatic barriers, clamps, screws, plates, clips, vascular implants, tissue adhesives and sealants, tissue scaffolds, various types of dressings (e.g., wound dressings), bone substitutes, intraluminal devices, vascular supports, etc. In some embodiments, the substrate is selected from the group consisting of: stents, joints, screws, rods, pins, plates, staples, shunts, clamps, clips, sutures, suture anchors, electrodes, catheters, leads, grafts, dressings, pacemakers, pacemaker housings, cardioverters, cardioverter housings, defibrillators, defibrillator housings, prostheses, ear drainage tubes, ophthalmic implants, orthopedic devices, vertebral disks, bone substitutes, anastomotic devices, perivascular wraps, colostomy bag attachment devices, hemostatic barriers, vascular implants, vascular supports, tissue adhesives, tissue sealants, tissue scaffolds and intraluminal devices.


In some embodiments, the substrate is an interventional device. An “interventional device” as used herein refers to any device for insertion into the body of a human or animal subject, which may or may not be left behind (implanted) for any length of time including, but not limited to, angioplasty balloons, cutting balloons.


In some embodiments, the substrate is a diagnostic device. A “diagnostic device” as used herein refers to any device for insertion into the body of a human or animal subject in order to diagnose a condition, disease or other of the patient, or in order to assess a function or state of the body of the human or animal subject, which may or may not be left behind (implanted) for any length of time.


In some embodiments, the substrate is a surgical tool. A “surgical tool” as used herein refers to a tool used in a medical procedure that may be inserted into (or touch) the body of a human or animal subject in order to assist or participate in that medical procedure.


In some embodiments, the coating is non-dendritic as compared to a baseline average coating thickness. In some embodiments, no coating extends more than 0.5 microns from the baseline average coating thickness. In some embodiments, no coating extends more than 1 micron from the baseline average coating thickness.


In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 0.5 microns. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 1 micron. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 2 microns following sintering of the coated substrate. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 3 microns following sintering of the coated substrate.



FIG. 4 shows an exemplary e-RESS system 200 for coating substrates including, e.g., medical device substrates and associated surfaces, according to an embodiment of the invention. Auxiliary emitter 100 mounts at a preselected location to deposition vessel 30. Inert carrier gas (e.g., dry nitrogen) flowed through auxiliary emitter 100 carries charged ions generated by auxiliary emitter 100 into deposition vessel 30. Auxiliary emitter 100 can be positioned at any location that provides a maximum generation of charged ions to chamber 26 and further facilitates convenient operation including, but not limited to, e.g., external (e.g., top, side) and internal. No limitations are intended. In some embodiments, auxiliary emitter 100 is mounted at the top of chamber 26 to maximize charge delivered thereto. Auxiliary emitter 100 delivers charged ions that supplements charge of solute particles released from expansion nozzle orifice 36 into deposition vessel 30. A typical voltage applied to stents 34 (substrates) is −15 kV, but is not limited thereto. In some embodiments, metal (copper) sheath 42 is grounded, but operation is not limited thereto. In some embodiments, polarity of the at least one substrate is a negative polarity and charge of the solid solute particles is enhanced (supplemented) with a positive charge. In another embodiment, the polarity of the at least one substrate is a positive polarity and the charge of the solid solute particles is enhanced (supplemented) with a negative charge. In deposition vessel 30, expansion nozzle assembly 32 (containing a 1st e-RESS electrode 44 or metal sheath 44) is located at the center of rotating stage 40 to which metal stents 34 (collectively a 2nd e-RESS electrode 34) are mounted so as to be coated in the coating process, as described further herein. A typical voltage applied to stents 34 (substrates) is −15 kV, but is not limited thereto. In some embodiments, metal (copper) sheath 44 of expansion assembly 32 is grounded, but operation is not limited thereto. In some embodiments, polarity of the polarity of the metal stents 34 or substrates 34 is a negative polarity and charge of the solid coating particles is enhanced (i.e., supplemented) with, e.g., a positive charge. In another embodiment, polarity of the metal stents 34 or substrates 34 is a positive polarity and the charge of the solid coating particles is enhanced (i.e., supplemented) with, e.g., a negative charge. No limitations are intended.


Process for Coating Substrates and Surfaces

Provided herein is a process for forming a coating on a surface of a substrate, comprising: establishing an electric field between the substrate and a counter electrode; producing coating particles suspended in a gaseous phase of an expanded near-critical or supercritical fluid having an first average electric potential; and contacting the coating particles with a stream of charged ions at a second average potential in an inert carrier gas to increase the charge differential between the coating particles and the substrate.


Provided herein is a method for coating a surface of a substrate with a preselected material forming a coating, comprising the steps of: establishing an electric field between the substrate and a counter electrode; producing coating particles suspended in a gaseous phase of an expanded near-critical or supercritical fluid having an first average electric potential; and contacting the coating particles with a stream of charged ions at a second average potential in an inert carrier gas to increase the potential differential between the coating particles and the substrate.


In some embodiments, the coating particles have a first velocity upon release of the coating particles from the expansion nozzle that is less than a second velocity of the coating particles when the coating particles impact the substrate. In some embodiments, attraction of the coating particles to the substrate is increased as compared to attraction of the coating particles to the substrate in a system without the auxiliary emitter. In some embodiments, the first average electric potential is different than the second average electric potential. In some embodiments, an absolute value of the first average electric potential is less than an absolute value of the second average electric potential, and wherein a polarity the charged ions is the same as a polarity of the coating particles.


In some embodiments, the coating particles have a size between about 0.01 micrometers and about 10 micrometers.


In some embodiments, the substrate has a negative polarity and an enhanced charge of the coating particles following the contacting step is a positive charge; or wherein the substrate has a positive polarity and an enhanced charge of the coating particles following the contacting step is a negative charge.


In some embodiments, the contacting step comprises forming a positive corona or forming a negative corona positioned between the expansion nozzle and the substrate. In some embodiments, the contacting step comprises forming a positive corona or forming a negative corona positioned between the auxiliary emitter and the substrate


In some embodiments, the coating has a density on the surface from about 1 volume % to about 60 volume %.


In some embodiments, the coating particles comprises at least one of: a polymer, a drug, a biosorbable material, a protein, a peptide, and a combination thereof.


In some embodiments, the coating particles comprises at least one of: polylactic acid (PLA); poly(lactic-co-glycolic acid) (PLGA); polycaprolactone (poly(e-caprolactone)) (PCL), polyglycolide (PG) or (PGA), poly-3-hydroxybutyrate; LPLA poly(l-lactide), DLPLA poly(dl-lactide), PDO poly(dioxolane), PGA-TMC, 85/15 DLPLG p(dl-lactide-co-glycolide), 75/25 DLPL, 65/35 DLPLG, 50/50 DLPLG, TMC poly(trimethylcarbonate), p(CPP:SA) poly(1,3-bis-p-(carboxyphenoxy)propane-co-sebacic acid) and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, and copolymers thereof. In some embodiments, the coating on the substrate comprises polylactoglycolic acid (PLGA) at a density greater than 5 volume %.


In some embodiments, the coating particles polyester, aliphatic polyester, polyanhydride, polyethylene, polyorthoester, polyphosphazene, polyurethane, polycarbonate urethane, aliphatic polycarbonate, silicone, a silicone containing polymer, polyolefin, polyamide, polycaprolactam, polyamide, polyvinyl alcohol, acrylic polymer, acrylate, polystyrene, epoxy, polyethers, celluiosics, expanded polytetrafluoroethylene, phosphorylcholine, polyethyleneyerphthalate, polymethylmethavrylate, poly(ethylmethacrylate/n-butylmethacrylate), parylene-C, polyethylene-co-vinyl acetate, polyalkyl methacrylates, polyalkylene-co-vinyl acetate, polyalkylene, polyalkyl siloxanes, polyhydroxyalkanoate, polyfluoroalkoxyphasphazine, poly(styrene-b-isobutylene-b-styrene), poly-butyl methacrylate, poly-byta-diene, and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, and copolymers thereof.


In some embodiments, the coating particles include a drug comprising one or more of: rapamycin, biolimus (biolimus A9), 40-O-(2-Hydroxyethyl)rapamycin (everolimus), 40-O-Benzyl-rapamycin, 40-O-(4′-Hydroxymethyl)benzyl-rapamycin, 40-O-[4′-(1,2-Dihydroxyethyl)]benzyl-rapamycin, 40-O-Allyl-rapamycin, 40-O-[3′-(2,2-Dimethyl-1,3-dioxolan-4(S)-yl)-prop-2′-en-1′-yl]-rapamycin, (2′:E,4′S)-40-O-(4′,5′-Dihydroxypent-2′-en-1′-yl)-rapamycin 40-O-(2-Hydroxy)ethoxycar-bonylmethyl-rapamycin, 40-O-(3-Hydroxyl)propyl-rapamycin 40-O-(6-Hydroxyl)hexyl-rapamycin 40-O-[2-(2-Hydroxyl)ethoxy]ethyl-rapamycin 40-O-[(3S)-2,2-Dimethyldioxolan-3-yl]methyl-rapamycin, 40-O-[(2S)-2,3-Dihydroxyprop-1-yl]-rapamycin, 40-O-(2-Acetoxy)ethyl-rapamycin 40-O-(2-Nicotinoyloxy)ethyl-rapamycin, 40-O-[2-(N-Morpholino)acetoxy]ethyl-rapamycin 40-O-(2-N-Imidazolylacetoxy)ethyl-rapamycin, 40-O-[2-(N-Methyl-N′-piperazinyl)acetoxy]ethyl-rapamycin, 39-O-Desmethyl-39,40-O,O-ethylene-rapamycin, (26R)-26-Dihydro-40-O-(2-hydroxyl)ethyl-rapamycin, 28-O-Methyl-rapamycin, 40-O-(2-Aminoethyl)-rapamycin, 40-O-(2-Acetaminoethyl)-rapamycin 40-O-(2-Nicotinamidoethyl)-rapamycin, 40-O-(2-(N-Methyl-imidazo-2′-ylcarbethoxamido)ethylrapamycin, 40-O-(2-Ethoxycarbonylaminoethyl)-rapamycin, 40-O-(2-Tolylsulfonamidoethyl)-rapamycin, 40-O-[2-(4′,5′-Dicarboethoxy-1′,2′,3′-triazol-1′-yl)-ethyl]-rapamycin, 42-Epi-(tetrazolyl)rapamycin (tacrolimus), 42-[3-hydroxy-2-(hydroxymethyl)-2-methylpropanoate]rapamycin (temsirolimus), (42S)-42-Deoxy-42-(1H-tetrazol-1-yl)-rapamycin (zotarolimus), and salts, derivatives, isomers, racemates, diastereoisomers, prodrugs, hydrate, ester, or analogs thereof.


In some embodiments, the method further includes the step of sintering the coating at a temperature in the range from about 25° C. to about 150° C. to form a dense, thermally stable film on the surface of the substrate.


In some embodiments, the method further includes the step of sintering the coating in the presence of a solvent gas to form the dense, thermally stable film on the surface of the substrate.


In some embodiments, the producing and the contacting steps, at least, are repeated to form a multilayer film.


In some embodiments, the substrate is at least a portion of a medical implant. In some embodiments, the substrate is an interventional device. In some embodiments, the substrate is a diagnostic device. In some embodiments, the substrate is a surgical tool. In some embodiments, the substrate is a stent. In some embodiments, the substrate is a medical balloon.


Medical implants may comprise any implant for insertion into the body of a human or animal subject, including but not limited to stents (e.g., coronary stents, vascular stents including peripheral stents and graft stents, urinary tract stents, urethral/prostatic stents, rectal stent, oesophageal stent, biliary stent, pancreatic stent), electrodes, catheters, leads, implantable pacemaker, cardioverter or defibrillator housings, joints, screws, rods, ophthalmic implants, femoral pins, bone plates, grafts, anastomotic devices, perivascular wraps, sutures, staples, shunts for hydrocephalus, dialysis grafts, colostomy bag attachment devices, ear drainage tubes, leads for pace makers and implantable cardioverters and defibrillators, vertebral disks, bone pins, suture anchors, hemostatic barriers, clamps, screws, plates, clips, vascular implants, tissue adhesives and sealants, tissue scaffolds, various types of dressings (e.g., wound dressings), bone substitutes, intraluminal devices, vascular supports, etc. In some embodiments, the substrate is selected from the group consisting of: stents, joints, screws, rods, pins, plates, staples, shunts, clamps, clips, sutures, suture anchors, electrodes, catheters, leads, grafts, dressings, pacemakers, pacemaker housings, cardioverters, cardioverter housings, defibrillators, defibrillator housings, prostheses, ear drainage tubes, ophthalmic implants, orthopedic devices, vertebral disks, bone substitutes, anastomotic devices, perivascular wraps, colostomy bag attachment devices, hemostatic barriers, vascular implants, vascular supports, tissue adhesives, tissue sealants, tissue scaffolds and intraluminal devices.


In some embodiments, the substrate is an interventional device. An “interventional device” as used herein refers to any device for insertion into the body of a human or animal subject, which may or may not be left behind (implanted) for any length of time including, but not limited to, angioplasty balloons, cutting balloons.


In some embodiments, the substrate is a diagnostic device. A “diagnostic device” as used herein refers to any device for insertion into the body of a human or animal subject in order to diagnose a condition, disease or other of the patient, or in order to assess a function or state of the body of the human or animal subject, which may or may not be left behind (implanted) for any length of time.


In some embodiments, the substrate is a surgical tool. A “surgical tool” as used herein refers to a tool used in a medical procedure that may be inserted into (or touch) the body of a human or animal subject in order to assist or participate in that medical procedure.


In some embodiments, the coating is non-dendritic as compared to a baseline average coating thickness. In some embodiments, no coating extends more than 0.5 microns from the baseline average coating thickness. In some embodiments, no coating extends more than 1 micron from the baseline average coating thickness.


In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 0.5 microns. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 1 micron. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 2 microns following sintering of the coated substrate. In some embodiments, the coating is non-dendritic such that there is no surface irregularity of the coating greater than 3 microns following sintering of the coated substrate.



FIG. 5 shows exemplary process steps for coating substrates with a low dendricity coating, according to an embodiment of the e-RESS process of the invention. {START}. In one step {step 510}, solid solute (coating) particles are produced by rapid expansion of supercritical solution (or near-critical) solution (RESS). The coating particles are released at least partially charged having an average electric potential as a consequence of the interaction between the expanding solution and the nucleating solute particles within the walls of the expansion nozzle assembly 32. The particles are released in a plume of the expansion gas. Aspects of the RESS expansion process for generating coating particles including, but not limited to, e.g., solutes (coating materials), solvents, temperatures, pressures, and voltages, and sintering (e.g., gas and/or heat sintering) to form stable thin films are detailed in U.S. Pat. Nos. 4,582,731; 4,734,227; 4,734,451; 6,756,084; and 6,749,902, which references are incorporated herein in their entirety. In typical operation, RESS parameters include an operating temperature of ˜150° C. and a pressure of up to 5500 psi for releasing the supercritical or near-critical solution are used. In another step {step 520}, charged ions are generated and used to enhance (supplement) charge of the coating particles. In another step {step 530}, charged ions are delivered in an inert flow gas from the auxiliary emitter (FIG. 2) and delivered into the deposition vessel (FIG. 4) where the charged ions intermix with the charged coating particles released from the RESS expansion nozzle (FIG. 3). The auxiliary emitter delivers a corona of charge that is either positive or negative. The charged ions in the corona deliver their charge (+ or −) to the coating particles, thereby enhancing (supplementing) the charge of the coating particles. The charged coating particles (e.g., with enhanced positive or enhanced negative) are then preferentially collected on selected substrates to which an opposite (e.g., negative for positive; or positive for negative) high voltage (polarity) is applied, or vice versa. In another step {step 540}, a potential difference is established between a first e-RESS electrode 44 in expansion nozzle assembly 32 and the substrates (stents) 34 that collectively act as a second e-RESS electrode 34. The substrates are positioned at a suitable location, e.g., equidistant from or adjacent to, electrode 44 of RESS assembly 32 to establish a suitable electric field between the two e-RESS electrodes 34, 44. The potential difference generates an electric field between the two e-RESS electrodes 34, 44. In some embodiments, the stents 34 are charged with a high potential (e.g., 15 kV, positive or negative); RESS assembly 32 electrode 44 (FIG. 3) is grounded, acting as a proximal ground electrode 44. In an alternate configuration, high voltage is applied to the proximal electrode 44 (e.g., metal sheath 44 of the expansion assembly 32), and the stents 34 (acting as a 2nd e-RESS electrode 34) are grounded, establishing a potential difference between the two e-RESS electrodes 34, 44. Either electrode 34, 44 can have an opposite potential applied, or vice versa. No limitations are intended by the exemplary implementations. Substrates (stents) are charged, e.g., using an independent power supply (not shown), or another charging device as will be understood by those of ordinary skill in the electrical arts. No limitations are intended. In another step {step 550}, coating particles now supplemented with enhanced charge (e.g., with enhanced positive or enhanced negative) experience an increased attraction to an oppositely charged substrate, and are accelerated through the electric field between the RESS electrodes at the selected potential. The impact velocity of the coating particles increases the impact energy at the surface of the charged substrate, forming a dense and/or uniform coating on the surface of the substrate. The enhanced charge on the particles enhances the collection (deposition) efficiency of the particles on the substrates. The enhanced charge and impact velocity of the charged coating particles improves the microstructure of the coating on the surface, minimizing the dendricity of the collected material deposited to the substrate, thereby increasing and improving the coating density as well as the uniformity of the coatings deposited to the substrate surface. In another step {step 560}, sintering of the coating forms a dense, thermally stable film on the substrate. Sintering can be performed by heating the substrates using various temperatures (so-called “heat sintering”) and/or sintering the substrates with a gaseous solvent phase to reduce the sintering temperatures used (so-called “gas sintering”). Temperatures for sintering of the coating may be selected in the range from about 25° C. to about 150° C., but temperatures are not intended to be limiting. Sintered films include, but are not limited to, e.g., single layer films and multilayer films. For example, substrates (e.g., stents) or medical devices staged within the deposition vessel can be coated with a single layer of a selected material, e.g., a polymer, a drug, and/or another material. Or, various multilayer films can be formed by some embodiment processes of the invention, as described further herein {END}.


Particle Size

Charged coating particles used in some embodiments have a size (cross-sectional diameter) between about 10 nm (0.01 μm) and 10 μm. More particularly, coating particles have a size selected between about 10 nm (0.01 μm) and 2 μm.


Particle (Impact) Velocity

Velocities of spherical particles in an electrical field (E) carrying maximum charge (q) can be determined from equations detailed, e.g., in “Charging of Materials and Transport of Charged Particles” (Wiley Encyclopedia of Electrical and Electronics Engineering, John G. Webster (Editor), Volume 7, 1999, John Wiley & Sons, Inc., pages 20-24), and “Properties, Behavior, and Measurement of Airborne Particles” (Aerosol Technology, William C. Hinds, 1982, John Wiley & Sons, Inc., pages 284-314), which references are incorporated herein. In particular, the electrostatic force (F) on a particle in an electric field (E) is given by Equation [1], as follows:

F=qE  [1]


Here, (q) is the electric charge [SI units: Coulombs] on the particle in the electric field (E) [SI units: Newtons per Coulomb (N·C−1)], which experiences an electrostatic force (F).


A particle also experiences a viscous drag force (Fd) in an enclosure gas, which is given by Equation [2], as follows:

Fd=6πμRV  [2]


Here, (μ) is the dynamic (absolute) viscosity of the selected gas, [e.g., as listed in “Viscosity of Gases”, CRC Handbook of Chemistry and Physics, 71st ed., CRC Press, Inc., 1990-1991, page 6-140, incorporated herein] at the selected gas temperature and pressure [SI units: Pascal seconds (Pa·s), where 1 μPa·s=10−5 poise; (R) is the radius of the particle (SI units: meters); and (V) is the particle terminal velocity [SI units: meters per second, (m·s−1)]. Viscosities of pure gases can vary by as much as a factor of 5 depending upon the gas type. Viscosities of refrigerant gases (e.g., fluorocarbon refrigerants) can be determined using a corresponding states method detailed, e.g., by Klein et al. [in Int. J. Refrigeration 20: 208-217, 1997, incorporated herein] over a temperature range from about −31.2° C. to 226.9° C. and pressures up to about 600 atm. Viscosities of mixed gases can be determined using Chapman-Enskog theory detailed, e.g., in [“The Properties of Gases and Liquids”, 5th ed., 2001, McGraw-Hill, Chapter 9, pages 9.1-9.51, incorporated herein], which viscosities are non-linear functions of the mole fractions of each pure gas. An exemplary e-RESS solvent used herein comprising fluoropropane refrigerant (e.g., R-236ea, Dyneon, Oakdale, Minn., USA) has a typical viscosity [at a pressure of 1 bar (15 psia), and temperature of 300K] of about −11.02 μPa·sec; nitrogen (N2) gas used as a typical carrier gas for the auxiliary emitter of the invention has a viscosity [at a pressure of 1 bar (15 psia), and temperature of 300K] of about −17.89 μPa·sec. Viscosity of an exemplary mixed gas [R-236ea and N2] (see Example 1) was estimated at −14.5 μPa·sec. The e-RESS solvent gas [R-236ea] demonstrated a viscosity about 40% lower than the N2 carrier gas in the enclosure chamber.


The terminal velocity (V) of charged particles in an electric field (E) can thus be determined by calculation by equating the electrostatic force (F) and the viscous drag force (Fd) exerted on a particle moving through a gas, as given by Equation [3]:









V
=

qE

6





πμ





R






[
3
]







Maximum terminal velocities for particles may also be determined from reference tables known in the art that include data based on the maximum possible charge on a particle and the maximum potentials achievable based on gas breakdown potentials in a selected gas.


Terminal velocities of particles released in the RESS expansion plume depend at least in part on the diameter of the particles produced. For example, coating particles having a size (diameter) of about 0.2 μm have an expected terminal (impact) velocity of from about 0.1 cm/sec to about 1 cm/sec [see, e.g., Table 4, “Charging of Materials and Transport of Charged Particles”, Wiley Encyclopedia of Electrical and Electronics Engineering, Volume 7, 1999, John G. Webster (Editor), John Wiley & Sons, Inc., page 23]. Coating particles with a size of about 2 μm have an expected terminal (impact) velocity of about 1 cm/sec to about 10 cm/sec, but velocities are not limited thereto. For example, in various embodiments, charged coating particles will have expected terminal (impact) velocities at least from about 0.1 cm/sec to about 100 cm/sec. Thus, no limitations are intended.


Applications

Coatings produced by of some embodiments can be deposited to various substrates and devices, including, e.g., medical devices and other components, e.g., for use in biomedical applications. Substrates can comprise materials including, but not limited to, e.g., conductive materials, semi-conductive materials, polymeric materials, and other selected materials. In various embodiments, coatings can be applied to medical stent devices. In other embodiments, substrates can be at least a portion of a medical device, e.g., a medical balloon, e.g., a non-conductive polymer balloon. All applications as will be considered by those of skill in the art in view of the disclosure are within the scope of the invention. No limitations are intended.


Coating Materials

Coating particles prepared by some embodiments can include various materials selected from, e.g., polymers, drugs, biosorbable materials, bioactive proteins and peptides, as well as combinations of these materials. These materials find use in coatings that are applied to, e.g., medical devices (e.g., medical balloons) and medical implant devices (e.g., drug-eluting stents), but are not limited thereto. Choice for near-critical or supercritical fluid is based on the solubility of the selected solute(s) of interest, which is not limited.


Polymers used in conjunction in some embodiments include, but are not limited to, e.g., polylactoglycolic acid (PLGA); polyethylene vinyl acetate (PEVA); poly(butyl methacrylate) (PBMA); perfluorooctanoic acid (PFOA); tetrafluoroethylene (TFE); hexafluoropropylene (HFP); polylactic acid (PLA); polyglycolic acid (PGA), including combinations of these polymers. Other polymers include various mixtures of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride (e.g., THV) at varying molecular ratios (e.g., 1:1:1).


Biosorbable polymers used in conjunction in some embodiments include, but are not limited to, e.g., polylactic acid (PLA); poly(lactic-co-glycolic acid) (PLGA); polycaprolactone (poly(e-caprolactone)) (PCL), polyglycolide (PG) or (PGA), poly-3-hydroxybutyrate; LPLA poly(l-lactide), DLPLA poly(dl-lactide), PDO poly(dioxolane), PGA-TMC, 85/15 DLPLG p(dl-lactide-co-glycolide), 75/25 DLPL, 65/35 DLPLG, 50/50 DLPLG, TMC poly(trimethylcarbonate), p(CPP:SA) poly(1,3-bis-p-(carboxyphenoxy)propane-co-sebacic acid) and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, and copolymers thereof.


Durable (biostable) polymers used in some embodiments include, but are not limited to, e.g., polyester, aliphatic polyester, polyanhydride, polyethylene, polyorthoester, polyphosphazene, polyurethane, polycarbonate urethane, aliphatic polycarbonate, silicone, a silicone containing polymer, polyolefin, polyamide, polycaprolactam, polyamide, polyvinyl alcohol, acrylic polymer, acrylate, polystyrene, epoxy, polyethers, celluiosics, expanded polytetrafluoroethylene, phosphorylcholine, polyethyleneyerphthalate, polymethylmethavrylate, poly(ethylmethacrylate/n-butylmethacrylate), parylene C, polyethylene-co-vinyl acetate, polyalkyl methacrylates, polyalkylene-co-vinyl acetate, polyalkylene, polyalkyl siloxanes, polyhydroxyalkanoate, polyfluoroalkoxyphasphazine, poly(styrene-b-isobutylene-b-styrene), poly-butyl methacrylate, poly-byta-diene, and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, and copolymers thereof. Other polymers selected for use can include polymers to which drugs are chemically (e.g., ionically and/or covalently) attached or otherwise mixed, including, but not limited to, e.g., heparin-containing polymers (HCP).


Drugs used in embodiments described herein include, but are not limited to, e.g., antibiotics (e.g., Rapamycin [CAS No. 53123-88-9], LC Laboratories, Woburn, Mass., USA, anticoagulants (e.g., Heparin [CAS No. 9005-49-6]; antithrombotic agents (e.g., clopidogrel); antiplatelet drugs (e.g., aspirin); immunosuppressive drugs; antiproliferative drugs; chemotherapeutic agents (e.g., paclitaxel also known by the trade name TAXOL® [CAS No. 33069-62-4], Bristol-Myers Squibb Co., New York, N.Y., USA) and/or a prodrug, a derivative, an analog, a hydrate, an ester, and/or a salt thereof).


Antibiotics include, but are not limited to, e.g., arnikacin, amoxicillin, gentamicin, kanamycin, neomycin, netilmicin, paromomycin, tobramycin, geldanamycin, herbimycin, carbacephem (loracarbef), ertapenem, doripenem, imipenem, cefadroxil, cefazolin, cefalotin, cephalexin, cefaclor, cefamandole, cefoxitin, cefprozil, cefuroxime, cefixime, cefdinir, cefditoren, cefoperazone, cefotaxime, cefpodoxime, ceftazidime, ceftibuten, ceftizoxime, ceftriaxone, cefepime, ceftobiprole, clarithromycin, clavulanic acid, clindamycin, teicoplanin, azithromycin, dirithromycin, erythromycin, troleandomycin, telithromycin, aztreonam, ampicillin, azlocillin, bacampicillin, carbenicillin, cloxacillin, dicloxacillin, flucloxacillin, mezlocillin, meticillin, nafcillin, norfloxacin, oxacillin, penicillin-G, penicillin-V, piperacillin, pvampicillin, pivmecillinam, ticarcillin, bacitracin, colistin, polymyxin-B, ciprofloxacin, enoxacin, gatifloxacin, levofloxacin, lomefloxacin, moxifloxacin, ofloxacin, trovafloxacin, grepafloxacin, sparfloxacin, afenide, prontosil, sulfacetamide, sulfamethizole, sulfanilimide, sulfamethoxazole, sulfisoxazole, trimethoprim, trimethoprim-sulfamethoxazole, demeclocycline, doxycycline, oxytetracycline, tetracycline, arsphenamine, chloramphenicol, lincomycin, ethambutol, fosfomycin, furazolidone, isoniazid, linezolid, mupirocin, nitrofurantoin, platensimycin, pyrazinamide, quinupristin/dalfopristin, rifampin, thiamphenicol, rifampicin, minocycline, sultamicillin, sulbactam, sulphonamides, mitomycin, spectinomycin, spiramycin, roxithromycin, and meropenem.


Antibiotics can also be grouped into classes of related drugs, for example, aminoglycosides (e.g., amikacin, gentamicin, kanamycin, neomycin, netilmicin, paromomycin, streptomycin, tobramycin), ansamycins (e.g., geldanamycin, herbimycin), carbacephem (loracarbef) carbapenems (e.g., ertapenem, doripenem, imipenem, meropenem), first generation cephalosporins (e.g., cefadroxil, cefazolin, cefalotin, cefalexin), second generation cephalosporins (e.g., cefaclor, cefamandole, cefoxitin, cefprozil, cefuroxime), third generation cephalosporins (e.g., cefixime, cefdinir, cefditoren, cefoperazone, cefotaxime, cefpodoxime, ceftazidime, ceftibuten, ceftizoxime, ceftriaxone), fourth generation cephalosporins (e.g., cefepime), fifth generation cephalosporins (e.g., ceftobiprole), glycopeptides (e.g., teicoplanin, vancomycin), macrolides (e.g., azithromycin, clarithromycin, dirithromycin, erythromycin, roxithromycin, troleandomycin, telithromycin, spectinomycin), monobactams (e.g., aztreonam), penicillins (e.g., amoxicillin, ampicillin, aziocillin, bacampicillin, carbenicillin, cloxacillin, dicloxacillin, flucloxacillin, mezlocillin, meticillin, nafcillin, oxacillin, penicillins-G and -V, piperacillin, pvampicillin, pivmecillinam, ticarcillin), polypeptides (e.g., bacitracin, colistin, polymyxin-B), quinolones (e.g., ciprofloxacin, enoxacin, gatifloxacin, levofloxacin, lomefloxacin, moxifloxacin, norfloxacin, ofloxacin, trovafloxacin, grepafloxacin, sparfloxacin, trovafloxacin), sulfonamides (e.g., afenide, prontosil, sulfacetamide, sulfamethizole, sulfanilimide, sulfasalazine, sulfamethoxazole, sulfisoxazole, trimethoprim, trimethoprim-sulfamethoxazole), tetracyclines (e.g., demeclocycline, doxycycline, minocycline, oxytetracycline, tetracycline).


Anti-thrombotic agents (e.g., clopidogrel) are contemplated for use in the methods and devices described herein. Use of anti-platelet drugs (e.g., aspirin), for example, to prevent platelet binding to exposed collagen, is contemplated for anti-restenotic or anti-thrombotic therapy. Anti-platelet agents include “GpIIb/IIIa inhibitors” (e.g., abciximab, eptifibatide, tirofiban, RheoPro) and “ADP receptor blockers” (prasugrel, clopidogrel, ticlopidine). Particularly useful for local therapy are dipyridamole, which has local vascular effects that improve endothelial function (e.g., by causing local release of t-PA, that will break up clots or prevent clot formation) and reduce the likelihood of platelets and inflammatory cells binding to damaged endothelium, and cAMP phosphodiesterase inhibitors, e.g., cilostazol, that could bind to receptors on either injured endothelial cells or bound and injured platelets to prevent further platelet binding.


Chemotherapeutic agents include, but are not limited to, e.g., angiostatin, DNA topoisomerase, endostatin, genistein, ornithine decarboxylase inhibitors, chiormethine, meiphalan, pipobroman, triethylene-melamine, triethylenethiophosphoramine, busulfan, carmustine (BCNU), streptozocin, 6-mercaptopurine, 6-thioguanine, Deoxyco-formycin, IFN-α, 17α-ethinylestradiol, diethylstilbestrol, testosterone, prednisone, fluoxymesterone, dromostanolone propionate, testolactone, megestrolacetate, methylprednisolone, methyl-testosterone, prednisolone, triamcinolone, chlorotrianisene, hydroxyprogesterone, estramustine, medroxyprogesteroneacetate, flutamide, zoladex, mitotane, hexamethylmelamine, indolyl-3-glyoxylic acid derivatives, (e.g., indibulin), doxorubicin and idarubicin, plicamycin (mithramycin) and mitomycin, mechlorethamine, cyclophosphamide analogs, trazenes—dacarbazinine (DTIC), pentostatin and 2-chlorodeoxyadenosine, letrozole, camptothecin (and derivatives), navelbine, erlotinib, capecitabine, acivicin, acodazole hydrochloride, acronine, adozelesin, aldesleukin, ambomycin, ametantrone acetate, anthramycin, asperlin, azacitidine, azetepa, azotomycin, batimastat, benzodepa, bisnafide, bisnafide dimesylate, bizelesin, bropirimine, cactinomycin, calusterone, carbetimer, carubicin hydrochloride, carzelesin, cedefingol, celecoxib (COX-2 inhibitor), cirolemycin, crisnatol mesylate, decitabine, dexormaplatin, dezaguanine mesylate, diaziquone, duazomycin, edatrexate, eflomithine, elsamitrucin, enloplatin, enpromate, epipropidine, erbulozole, etanidazole, etoprine, flurocitabine, fosquidone, lometrexol, losoxantrone hydrochloride, masoprocol, maytansine, megestrol acetate, melengestrol acetate, metoprine, meturedepa, mitindomide, mitocarcin, mitocromin, mitogillin, mitomalcin, mitosper, mycophenolic acid, nocodazole, nogalamycin, ormaplatin, oxisuran, pegaspargase, peliomycin, pentamustine, perfosfamide, piposulfan, plomestane, porfimer sodium, porfiromycin, puromycin, pyrazofurin, riboprine, safingol, simtrazene, sparfosate sodium, spiromustine, spiroplatin, streptonigrin, sulofenur, tecogalan sodium, taxotere, tegafur, teloxantrone hydrochloride, temoporfin, thiamiprine, tirapazamine, trestolone acetate, triciribine phosphate, trimetrexate glucuronate, tubulozole hydrochloride, uracil mustard, uredepa, verteporfin, vinepidine sulfate, vinglycinate sulfate, vinleurosine sulfate, vinorelbine tartrate, vinrosidine sulfate, zeniplatin, zinostatin, 20-epi-1,25 dihydroxyvitamin-D3, 5-ethynyluracil, acylfulvene, adecypenol, ALL-TK antagonists, ambamustine, amidox, amifostine, aminolevulinic acid, amrubicin, anagrelide, andrographolide, antagonist-D, antagonist-G, antarelix, anti-dorsalizing morphogenetic protein-1, antiandrogen, antiestrogen, estrogen agonist, apurinic acid, ara-CDP-DL-PTBA, arginine deaminase, asulacrine, atamestane, atrimustine, axinastatin-1, axinastatin-2, axinastatin-3, azasetron, azatoxin, azatyrosine, baccatin III derivatives, balanol, BCR/ABL antagonists, benzochlorins, benzoylstaurosporine, beta lactam derivatives, beta-alethine, betaclamycin-B, betulinic acid, bFGF inhibitor, bisaziridinylspermine, bistratene-A, breflate, buthionine sulfoximine, calcipotriol, calphostin-C, carboxamide-amino-triazole, carboxyamidotriazole, CaRest M3, CARN 700, cartilage derived inhibitor, casein kinase inhibitors (ICOS), castanospermine, cecropin B, cetrorelix, chloroquinoxaline sulfonamide, cicaprost, cis-porphyrin, clomifene analogues, clotrimazole, collismycin-A, collismycin-B, combretastatin-A4, combretastatin analogue, conagenin, crambescidin-816, cryptophycin-8, cryptophycin-A derivatives, curacin-A, cyclopentanthraquinones, cycloplatam, cypemycin, cytolytic factor, cytostatin, dacliximab, dehydrodidemnin B, dexamethasone, dexifosfamide, dexrazoxane, dexverapamil, didemnin-B, didox, diethylnorspermine, dihydro-5-azacytidine, dihydrotaxol, 9-, dioxamycin, docosanol, dolasetron, dronabinol, duocarmycin-SA, ebselen, ecomustine, edelfosine, edrecolomab, elemene, emitefur, estramustine analogue, filgrastim, flavopiridol, flezelastine, fluasterone, fluorodaunorunicin hydrochloride, forfenimex, gadolinium texaphyrin, galocitabine, gelatinase inhibitors, glutathione inhibitors, hepsulfam, heregulin, hexamethylene bisacetamide, hypericin, ibandronic acid, idramantone, ilomastat, imatinib (e.g., Gleevec), imiquimod, immunostimulant peptides, insulin-like growth factor-1 receptor inhibitor, interferon agonists, interferons, interleukins, iobenguane, iododoxorubicin, ipomeanol, 4-, iroplact, irsogladine, isobengazole, isohomohalicondrin-B, itasetron, jasplakinolide, kahalalide-F, lamellarin-N triacetate, leinamycin, lenograstim, lentinan sulfate, leptolstatin, leukemia inhibiting factor, leukocyte alpha interferon, leuprolide+estrogen+progesterone, linear polyamine analogue, lipophilic disaccharide peptide, lipophilic platinum compounds, lissoclinamide-7, lobaplatin, lombricine, loxoribine, lurtotecan, lutetium texaphyrin, lysofylline, lytic peptides, maitansine, mannostatin-A, marimastat, maspin, matrilysin inhibitors, matrix metalloproteinase inhibitors, meterelin, methioninase, metoclopramide, MIF inhibitor, mifepristone, miltefosine, mirimostim, mitoguazone, mitotoxin fibroblast growth factor-saporin, mofarotene, molgramostim, Erbitux, human chorionic gonadotrophin, monophosphoryl lipid A+myobacterium cell wall sk, mustard anticancer agent, mycaperoxide-B, mycobacterial cell wall extract, myriaporone, N-acetyldinaline, N-substituted benzamides, nagrestip, naloxone+pentazocine, napavin, naphterpin, nartograstim, nedaplatin, nemorubicin, neridronic acid, nisamycin, nitric oxide modulators, nitroxide antioxidant, nitrullyn, oblimersen (Genasense), O6-benzylguanine, okicenone, onapristone, ondansetron, oracin, oral cytokine inducer, paclitaxel analogues and derivatives, palauamine, palmitoylrhizoxin, pamidronic acid, panaxytriol, panomifene, parabactin, peldesine, pentosan polysulfate sodium, pentrozole, perflubron, perillyl alcohol, phenazinomycin, phenylacetate, phosphatase inhibitors, picibanil, pilocarpine hydrochloride, placetin-A, placetin-B, plasminogen activator inhibitor, platinum complex, platinum compounds, platinum-triamine complex, propyl bis-acridone, prostaglandin-J2, proteasome inhibitors, protein A-based immune modulator, protein kinase-C inhibitors, microalgal, pyrazoloacridine, pyridoxylated hemoglobin polyoxyethylene conjugate, raf antagonists, raltitrexed, ramosetron, ras farnesyl protein transferase inhibitors, ras-GAP inhibitor, retelliptine demethylated, rhenium Re-186 etidronate, ribozymes, RII retinamide, rohitukine, romurtide, roquinimex, rubiginone-B1, ruboxyl, saintopin, SarCNU, sarcophytol A, sargramostim, Sdi-1 mimetics, senescence derived inhibitor-1, signal transduction inhibitors, sizofiran, sobuzoxane, sodium borocaptate, solverol, somatomedin binding protein, sonermin, sparfosic acid, spicamycin-D, splenopentin, spongistatin-1, squalamine, stipiamide, stromelysin inhibitors, sulfinosine, superactive vasoactive intestinal peptide antagonist, suradista, suramin, swainsonine, tallimustine, tazarotene, tellurapyrylium, telomerase inhibitors, tetrachlorodecaoxide, tetrazomine, thiocoraline, thrombopoietin, thrombopoietin mimetic, thymalfasin, thymopoietin receptor agonist, thymotrinan, thyroid stimulating hormone, tin ethyl etiopurpurin, titanocene bichloride, topsentin, translation inhibitors, tretinoin, triacetyluridine, tropisetron, turosteride, ubenimex, urogenital sinus-derived growth inhibitory factor, variolin-B, velaresol, veramine, verdins, vinxaltine, vitaxin, zanoterone, zilascorb, zinostatin stimalamer, acanthifolic acid, aminothiadiazole, anastrozole, bicalutamide, brequinar sodium, capecitabine, carmofur, Ciba-Geigy CGP-30694, cladribine, cyclopentyl cytosine, cytarabine phosphate stearate, cytarabine conjugates, cytarabine ocfosfate, Lilly DATHF, Merrel Dow DDFC, dezaguanine, dideoxycytidine, dideoxyguanosine, didox, Yoshitomi DMDC, doxifluridine, Wellcome EHNA, Merck & Co. EX-015, fazarabine, floxuridine, fludarabine, fludarabine phosphate, N-(2′-furanidyl)-5-fluorouracil, Daiichi Seiyaku FO-152, 5-FU-fibrinogen, isopropyl pyrrolizine, Lilly LY-188011, Lilly LY-264618, methobenzaprim, methotrexate, Wellcome MZPES, norspermidine, nolvadex, NCI NSC-127716, NCI NSC-264880, NCI NSC-39661, NCI NSC-612567, Warner-Lambert PALA, pentostatin, piritrexim, plicamycin, Asahi Chemical PL-AC, stearate, Takeda TAC-788, thioguanine, tiazofurin, Erbamont TIF, trimetrexate, tyrosine kinase inhibitors, tyrosine protein kinase inhibitors, Taiho UFT, uricytin, Shionogi 254-5, aldo-phosphamide analogues, altretamine, anaxirone, Boehringer Mannheim BBR-2207, bestrabucil, budotitane, Wakunaga CA-102, carboplatin, carmustine (BiCNU), Chinoin-139, Chinoin-153, chlorambucil, cisplatin, cyclophosphamide, American Cyanamid CL-286558, Sanofi CY-233, cyplatate, dacarbazine, Degussa D-19-384, Sumimoto DACHP(Myr)2, diphenyispiromustine, diplatinum cytostatic, Chugai DWA-2114R, ITI E09, elmustine, Erbamont FCE-24517, estramustine phosphate sodium, etoposide phosphate, fotemustine, Unimed G-6-M, Chinoin GYKI-17230, hepsul-fam, ifosfamide, iproplatin, lomustine, mafosfamide, mitolactol, mycophenolate, Nippon Kayaku NK-121, NCI NSC-264395, NCI NSC-342215, oxaliplatin, Upjohn PCNU, prednimustine, Prater PTT-119, ranimustine, semustine, SmithKline SK&F-101772, thiotepa, Yakult Honsha SN-22, spiromus-tine, Tanabe Seiyaku TA-077, tauromustine, temozolomide, teroxirone, tetraplatin and trimelamol, Taiho 4181-A, aclarubicin, actinomycin-D, actinoplanone, Erbamont ADR-456, aeroplysinin derivative, Ajinomoto AN-201-II, Ajinomoto AN-3, Nippon Soda anisomycins, anthracycline, azino-mycin-A, bisucaberin, Bristol-Myers BL-6859, Bristol-Myers BMY-25067, Bristol-Myers BMY-25551, Bristol-Myers BMY-26605, Bristol-Myers BMY-27557, Bristol-Myers BMY-28438, bleomycin sulfate, bryostatin-1, Taiho C-1027, calichemycin, chromoximycin, dactinomycin, daunorubicin, Kyowa Hakko DC-102, Kyowa Hakko DC-79, Kyowa Hakko DC-88A, Kyowa Hakko DC89-A1, Kyowa Hakko DC92-B, ditrisarubicin B, Shionogi DOB-41, doxorubicin, doxorubicin-fibrinogen, elsamicin-A, epirubicin, erbstatin, esorubicin, esperamicin-A1, esperamicin-Alb, Erbamont FCE-21954, Fujisawa FK-973, fostriecin, Fujisawa FR-900482, glidobactin, gregatin-A, grincamycin, herbimycin, idarubicin, illudins, kazusamycin, kesarirhodins, Kyowa Hakko KM-5539, Kirin Brewery KRN-8602, Kyowa Hakko KT-5432, Kyowa Hakko KT-5594, Kyowa Hakko KT-6149, American Cyanamid LL-D49194, Meiji Seika ME 2303, menogaril, mitomycin, mitomycin analogues, mitoxantrone, SmithKline M-TAG, neoenactin, Nippon Kayaku NK-313, Nippon Kayaku NKT-01, SRI International NSC-357704, oxalysine, oxaunomycin, peplomycin, pilatin, pirarubicin, porothramycin, pyrindamycin A, Tobishi RA-I, rapamycin, rhizoxin, rodorubicin, sibanomicin, siwenmycin, Sumitomo SM-5887, Snow Brand SN-706, Snow Brand SN-07, sorangicin-A, sparsomycin, SS Pharmaceutical SS-21020, SS Pharmaceutical SS-7313B, SS Pharmaceutical SS-9816B, steffimycin B, Taiho 4181-2, talisomycin, Takeda TAN-868A, terpentecin, thrazine, tricrozarin A, Upjohn U-73975, Kyowa Hakko UCN-10028A, Fujisawa WF-3405, Yoshitomi Y-25024, zorubicin, 5-fluorouracil (5-FU), the peroxidate oxidation product of inosine, adenosine, or cytidine with methanol or ethanol, cytosine arabinoside (also referred to as Cytarabin, araC, and Cytosar), 5-Azacytidine, 2-Fluoroadenosine-5′-phosphate (Fludara, also referred to as FaraA), 2-Chlorodeoxyadenosine, Abarelix, Abbott A-84861, Abiraterone acetate, Aminoglutethimide, Asta Medica AN-207, Antide, Chugai AG-041R, Avorelin, aseranox, Sensus B2036-PEG, buserelin, BTG CB-7598, BTG CB-7630, Casodex, cetrolix, clastroban, clodronate disodium, Cosudex, Rotta Research CR-1505, cytadren, crinone, deslorelin, droloxifene, dutasteride, Elimina, Laval University EM-800, Laval University EM-652, epitiostanol, epristeride, Mediolanum EP-23904, EntreMed 2-ME, exemestane, fadrozole, finasteride, formestane, Pharmacia & Upjohn FCE-24304, ganirelix, goserelin, Shire gonadorelin agonist, Glaxo Wellcome GW-5638, Hoechst Marion Roussel Hoe-766, NCI hCG, idoxifene, isocordoin, Zeneca ICI-182780, Zeneca ICI-118630, Tulane University J015X, Schering Ag J96, ketanserin, lanreotide, Milkhaus LDI-200, letrozol, leuprolide, leuprorelin, liarozole, lisuride hydrogen maleate, loxiglumide, mepitiostane, Ligand Pharmaceuticals LG-1127, LG-1447, LG-2293, LG-2527, LG-2716, Bone Care International LR-103, Lilly LY-326315, Lilly LY-353381-HCl, Lilly LY-326391, Lilly LY-353381, Lilly LY-357489, miproxifene phosphate, Orion Pharma MPV-2213ad, Tulane University MZ-4-71, nafarelin, nilutamide, Snow Brand NKS01, Azko Nobel ORG-31710, Azko Nobel ORG-31806, orimeten, orimetene, orimetine, ormeloxifene, osaterone, Smithkline Beecham SKB-105657, Tokyo University OSW-1, Peptech PTL-03001, Pharmacia & Upjohn PNU-156765, quinagolide, ramorelix, Raloxifene, statin, sandostatin LAR, Shionogi S-10364, Novartis SMT-487, somavert, somatostatin, tamoxifen, tamoxifen methiodide, teverelix, toremifene, triptorelin, TT-232, vapreotide, vorozole, Yamanouchi YM-116, Yamanouchi YM-511, Yamanouchi YM-55208, Yamanouchi YM-53789, Schering AG ZK-1911703, Schering AG ZK-230211, and Zeneca ZD-182780, alpha-carotene, alpha-difluoromethyl-arginine, acitretin, Biotec AD-5, Kyorin AHC-52, alstonine, amonafide, amphethinile, amsacrine, Angiostat, ankinomycin, anti-neoplaston-A10, antineoplaston-A2, antineoplaston-A3, antineoplaston-A5, antineoplaston-AS2-1, Henkel-APD, aphidicolin glycinate, asparaginase, Avarol, baccharin, batracylin, benfluron, benzotript, Ipsen-Beaufour BIM-23015, bisantrene, Bristo-Myers BMY-40481, Vestar boron-10, bromofosfamide, Wellcome BW-502, Wellcome BW-773, calcium carbonate, Calcet, Calci-Chew, Calci-Mix, Roxane calcium carbonate tablets, caracemide, carmethizole hydrochloride, Ajinomoto CDAF, chlorsulfaquinoxalone, Chemes CHX-2053, Chemex CHX-100, Wamer-Lambert CI-921, Warner-Lambert CI-937, Warner-Lambert CI-941, Warner-Lambert CI-958, clanfenur, claviridenone, ICN compound 1259, ICN compound 4711, Contracan, Cell Pathways CP-461, Yakult Honsha CPT-11, crisnatol, curaderm, cytochalasin B, cytarabine, cytocytin, Merz D-609, DABIS maleate, datelliptinium, DFMO, didemnin-B, dihaematoporphyrin ether, dihydrolenperone dinaline, distamycin, Toyo Pharmar DM-341, Toyo Pharmar DM-75, Daiichi Seiyaku DN-9693, docetaxel, Encore Pharmaceuticals E7869, elliprabin, elliptinium acetate, Tsumura EPMTC, ergotamine, etoposide, etretinate, Eulexin, Cell Pathways Exisulind (sulindac sulphone or CP-246), fenretinide, Florical, Fujisawa FR-57704, gallium nitrate, gemcitabine, genkwadaphnin, Gerimed, Chugai GLA-43, Glaxo GR-63178, grifolan NMF-5N, hexadecyiphosphocholine, Green Cross HO-221, homoharringtonine, hydroxyurea, BTG ICRF-187, ilmofosine, irinotecan, isoglutamine, isotretinoin, Otsuka JI-36, Ramot K-477, ketoconazole, Otsuak K-76COONa, Kureha Chemical K-AM, MECT Corp KI-8110, American Cyanamid L-623, leucovorin, levamisole, leukoregulin, lonidamine, Lundbeck LU-23-112, Lilly LY-186641, Materna, NCI (US) MAP, marycin, Merrel Dow MDL-27048, Medco MEDR-340, megestrol, merbarone, merocyanine derivatives, methylanilinoacridine, Molecular Genetics MGI-136, minactivin, mitonafide, mitoquidone, Monocal, mopidamol, motretinide, Zenyaku Kogyo MST-16, Mylanta, N-(retinoyl)amino acids, Nilandron, Nisshin Flour Milling N-021, N-acylated-dehydroalanines, nafazatrom, Taisho NCU-190, Nephro-Calci tablets, nocodazole derivative, Normosang, NCI NSC-145813, NCI NSC-361456, NCI NSC-604782, NCI NSC-95580, octreotide, Ono ONO-112, oquizanocine, Akzo Org-10172, paclitaxel, pancratistatin, pazelliptine, Warner-Lambert PD-111707, Wamer-Lambert PD-115934, Warner-Lambert PD-131141, Pierre Fabre PE-1001, ICRT peptide-D, piroxantrone, polyhaematoporphyrin, polypreic acid, Efamol porphyrin, probimane, procarbazine, proglumide, Invitron protease nexin I, Tobishi RA-700, razoxane, retinoids, R-flurbiprofen (Encore Pharmaceuticals), Sandostatin, Sapporo Breweries RBS, restrictin-P, retelliptine, retinoic acid, Rhone-Poulenc RP-49532, Rhone-Poulenc RP-56976, Scherring-Plough SC-57050, Scherring-Plough SC-57068, selenium (selenite and selenomethionine), SmithKline SK&F-104864, Sumitomo SM-108, Kuraray SMANCS, SeaPharm SP-10094, spatol, spirocyclopropane derivatives, spirogermanium, Unimed, SS Pharmaceutical SS-554, strypoldinone, Stypoldione, Suntory SUN 0237, Suntory SUN 2071, Sugen SU-101, Sugen SU-5416, Sugen SU-6668, sulindac, sulindac sulfone, superoxide dismutase, Toyama T-506, Toyama T-680, taxol, Teijin TEI-0303, teniposide, thaliblastine, Eastman Kodak TJB-29, tocotrienol, Topostin, Teijin TT-82, Kyowa Hakko UCN-01, Kyowa Hakko UCN-1028, ukrain, Eastman Kodak USB-006, vinblastine, vinblastine sulfate, vincristine, vincristine sulfate, vindesine, vindesine sulfate, vinestramide, vinorelbine, vintriptol, vinzolidine, withanolides, Yamanouchi YM-534, Zileuton, ursodeoxycholic acid, Zanosar.


Drugs used in some embodiments described herein include, but are not limited to, e.g., an immunosuppressive drug such as a macrolide immunosuppressive drug, which may comprise one or more of rapamycin, biolimus (biolimus A9), 40-O-(2-Hydroxyethyl)rapamycin (everolimus), 40-O-Benzyl-rapamycin, 40-O-(4′-Hydroxymethyl)benzyl-rapamycin, 40-O-[4′-(1,2-Dihydroxyethyl)]benzyl-rapamycin, 40-O-Allyl-rapamycin, 40-O-[3′-(2,2-Dimethyl-1,3-dioxolan-4(S)-yl)-prop-2′-en-1′-yl]-rapamycin, (2′:E,4′S)-40-O-(4′,5′-Dihydroxypent-2′-en-1′-yl)-rapamycin 40-O-(2-Hydroxy)ethoxycar-bonylmethyl-rapamycin, 40-O-(3-Hydroxyl)propyl-rapamycin 40-O-(6-Hydroxyl)hexyl-rapamycin 40-O-[2-(2-Hydroxyl)ethoxy]ethyl-rapamycin 40-O-[(3S)-2,2-Dimethyldioxolan-3-yl]methyl-rapamycin, 40-O-[(2S)-2,3-Dihydroxyprop-1-yl]-rapamycin, 40-O-(2-Acetoxy)ethyl-rapamycin 40-O-(2-Nicotinoyloxy)ethyl-rapamycin, 40-O-[2-(N-Morpholino)acetoxy]ethyl-rapamycin 40-O-(2-N-Imidazolylacetoxy)ethyl-rapamycin, 40-O-[2-(N-Methyl-N′-piperazinyl)acetoxy]ethyl-rapamycin, 39-O-Desmethyl-39,40-O,O-ethylene-rapamycin, (26R)-26-Dihydro-40-O-(2-hydroxyl)ethyl-rapamycin, 28-O-Methyl-rapamycin, 40-O-(2-Aminoethyl)-rapamycin, 40-O-(2-Acetaminoethyl)-rapamycin 40-O-(2-Nicotinamidoethyl)-rapamycin, 40-O-(2-(N-Methyl-imidazo-2′-ylcarbethoxamido)ethylrapamycin, 40-O-(2-Ethoxycarbonylaminoethyl)-rapamycin, 40-O-(2-Tolylsulfonamidoethyl)-rapamycin, 40-O-[2-(4′,5′-Dicarboethoxy-1′,2′,3′-triazol-1′-yl)-ethyl]-rapamycin, 42-Epi-(tetrazolyl)rapamycin (tacrolimus), 42-[3-hydroxy-2-(hydroxymethyl)-2-methylpropanoate]rapamycin (temsirolimus), (42S)-42-Deoxy-42-(1H-tetrazol-1-yl)-rapamycin (zotarolimus), and salts, derivatives, isomers, racemates, diastereoisomers, prodrugs, hydrate, ester, or analogs thereof.


Drugs used in embodiments described herein include, but are not limited to, e.g., Acarbose, acetylsalicylic acid, acyclovir, allopurinol, alprostadil, prostaglandins, amantadine, ambroxol, amlodipine, S-aminosalicylic acid, amitriptyline, atenolol, azathioprine, balsalazide, beclomethasone, betahistine, bezafibrate, diazepam and diazepam derivatives, budesonide, bufexamac, buprenorphine, methadone, calcium salts, potassium salts, magnesium salts, candesartan, carbamazepine, captopril, cetirizine, chenodeoxycholic acid, theophylline and theophylline derivatives, trypsins, cimetidine, clobutinol, clonidine, cotrimoxazole, codeine, caffeine, vitamin D and derivatives of vitamin D, colestyramine, cromoglicic acid, coumarin and coumarin derivatives, cysteine, ciclosporin, cyproterone, cytabarine, dapiprazole, desogestrel, desonide, dihydralazine, diltiazem, ergot alkaloids, dimenhydrinate, dimethyl sulphoxide, dimeticone, domperidone and domperidan derivatives, dopamine, doxazosin, doxylamine, benzodiazepines, diclofenac, desipramine, econazole, ACE inhibitors, enalapril, ephedrine, epinephrine, epoetin and epoetin derivatives, morphinans, calcium antagonists, modafinil, orlistat, peptide antibiotics, phenytoin, riluzoles, risedronate, sildenafil, topiramate, estrogen, progestogen and progestogen derivatives, testosterone derivatives, androgen and androgen derivatives, ethenzamide, etofenamate, etofibrate, fenofibrate, etofylline, famciclovir, famotidine, felodipine, fentanyl, fenticonazole, gyrase inhibitors, fluconazole, fluarizine, fluoxetine, flurbiprofen, ibuprofen, fluvastatin, follitropin, formoterol, fosfomicin, furosemide, fusidic acid, gallopamil, ganciclovir, gemfibrozil, ginkgo, Saint John's wort, glibenclamide, urea derivatives as oral antidiabetics, glucagon, glucosamine and glucosamine derivatives, giutathione, glycerol and glycerol derivatives, hypothalamus hormones, guanethidine, halofantrine, haloperidol, heparin (and derivatives), hyaluronic acid, hydralazine, hydrochlorothiazide (and derivatives), salicylates, hydroxyzine, imipramine, indometacin, indoramine, insulin, iodine and iodine derivatives, isoconazole, isoprenaline, glucitol and glucitol derivatives, itraconazole, ketoprofen, ketotifen, lacidipine, lansoprazole, levodopa, levomethadone, thyroid hormones, lipoic acid (and derivatives), lisinopril, lisuride, lofepramine, loperamide, loratadine, maprotiline, mebendazole, mebeverine, meclozine, mefenamic acid, mefloquine, meloxicam, mepindolol, meprobamate, mesalazine, mesuximide, metamizole, metformin, methylphenidate, metixene, metoprolol, metronidazole, mianserin, miconazole, minoxidil, misoprostol, mizolastine, moexipril, morphine and morphine derivatives, evening primrose, nalbuphine, naloxone, tilidine, naproxen, narcotine, natamycin, neostigmine, nicergoline, nicethamide, nifedipine, niflumic acid, nimodipine, nimorazole, nimustine, nisoldipine, adrenaline and adrenaline derivatives, novamine sulfone, noscapine, nystatin, olanzapine, olsalazine, omeprazole, omoconazole, oxaceprol, oxiconazole, oxymetazoline, pantoprazole, paracetamol (acetaminophen), paroxetine, penciclovir, pentazocine, pentifylline, pentoxifylline, perphenazine, pethidine, plant extracts, phenazone, pheniramine, barbituric acid derivatives, phenylbutazone, pimozide, pindolol, piperazine, piracetam, pirenzepine, piribedil, piroxicam, pramipexole, pravastatin, prazosin, procaine, promazine, propiverine, propranolol, propyphenazone, protionamide, proxyphylline, quetiapine, quinapril, quinaprilat, ramipril, ranitidine, reproterol, reserpine, ribavirin, risperidone, ritonavir, ropinirole, roxatidine, ruscogenin, rutoside (and derivatives), sabadilla, salbutamol, salmeterol, scopolamine, selegiline, sertaconazole, sertindole, sertralion, silicates, simvastatin, sitosterol, sotalol, spaglumic acid, spirapril, spironolactone, stavudine, streptomycin, sucralfate, sufentanil, sulfasalazine, sulpiride, sultiam, sumatriptan, suxamethonium chloride, tacrine, tacrolimus, taliolol, taurolidine, temazepam, tenoxicam, terazosin, terbinafine, terbutaline, terfenadine, terlipres sin, tertatolol, teryzoline, theobromine, butizine, thiamazole, phenothiazines, tiagabine, tiapride, propionic acid derivatives, ticlopidine, timolol, tinidazole, tioconazole, tioguanine, tioxolone, tiropramide, tizanidine, tolazoline, tolbutamide, tolcapone, tolnaftate, tolperisone, topotecan, torasemide, tramadol, tramazoline, trandolapril, tranylcypromine, trapidil, trazodone, triamcinolone derivatives, triamterene, trifluperidol, trifluridine, trimipramine, tripelennamine, triprolidine, trifosfamide, tromantadine trometamol, tropalpin, troxerutine, tulobuterol, tyramine, tyrothricin, urapidil, valaciclovir, valproic acid, vancomycin, vecuronium chloride, Viagra, venlafaxine, verapamil, vidarabine, vigabatrin, viloazine, vincamine, vinpocetine, viquidil, warfarin, xantinol nicotinate, xipamide, zafirlukast, zalcitabine, zidovudine, zolmitriptan, zolpidem, zoplicone, zotipine, amphotericin B, caspofungin, voriconazole, resveratrol, PARP-1 inhibitors (including imidazoquinolinone, imidazpyridine, and isoquinolindione, tissue plasminogen activator (tPA), melagatran, lanoteplase, reteplase, staphylokinase, streptokinase, tenecteplase, urokinase, abciximab (ReoPro), eptifibatide, tirofiban, prasugrel, clopidogrel, dipyridamole, cilostazol, VEGF, heparan sulfate, chondroitin sulfate, elongated “RGD” peptide binding domain, CD34 antibodies, cerivastatin, etorvastatin, losartan, valartan, erythropoietin, rosiglitazone, pioglitazone, mutant protein Apo A1 Milano, adiponectin, (NOS) gene therapy, glucagon-like peptide 1, atorvastatin, and atrial natriuretic peptide (ANP), lidocaine, tetracaine, dibucaine, hyssop, ginger, turmeric, Amica montana, helenalin, cannabichromene, rofecoxib, hyaluronidase, and salts, derivatives, isomers, racemates, diastereoisomers, prodrugs, hydrate, ester, or analogs thereof.


For example, coatings on medical devices can include drugs used in time-release drug applications. Proteins may be coated according to these methods and coatings described herein may comprise proteins. Peptides may be coated according to these methods and coatings described herein may comprise peptides.


In exemplary tests of the coating process, coating particles were generated by expansion of a near-critical or a supercritical solution prepared using a hydrofluorcarbon solvent, (e.g., fluoropropane R-236ea, Dyneon, Oakdale, Minn., USA) that further contained a biosorbable polymer used in biomedical applications [e.g., a 50:50 poly(DL-lactide-co-glycolide)] (Catalog No. B6010-2P), available commercially (LACTEL® Absorbable Polymers, a division of Durect, Corp., Pelham, Ala., USA). The supercritical solution was expanded and delivered through the expansion nozzle (FIG. 3) at ambient (i.e., STP) conditions.


Coatings
Single Layer and Multi-Layer

Provided herein is a coating on a surface of a substrate produced by any of the methods described herein. Provided herein is a coating on a surface of a substrate produced by any of the systems described herein.


In addition to single layer films, multi-layer films can also be produced by in some embodiments, e.g., by depositing coating particles made of various materials in a serial or sequential fashion to a selected substrate, e.g., a medical device. For example, in one process, coating particles comprising various single materials (e.g., A, B, C) can form multi-layer films of the form A-B-C, including combinations of these layers (e.g., A-B-A-B-C, A-B-C-A-B-C, C-B-A-A-B-C), and various multiples of these film combinations. In other processes, multi-layer films can be prepared, e.g., by depositing coating particles that include more than one material, e.g., a drug (D) and a polymer (P) carrier in a single particle of the form (DP). No limitations are intended. In exemplary tests, 3-layer films and 5-layer films were prepared that included a polymer (P) and a Drug (D), producing films of the form P-D-P and P-D-P-D-P. Films can be formed by depositing the coating particles for each layer sequentially, and then sintering. Alternatively, coating particles for any one layer can be deposited, followed by a sintering step to form the multi-layer film. Tests showed film quality is essentially identical.


Controlling Coating Thickness

Thickness and coating materials are principal parameters for producing coatings suitable, e.g., for medical applications. Film thickness on a substrate is controlled by factors including, but not limited to, e.g., expansion solution concentration, delivery pressure, exposure times, and deposition cycles that deposits coating particles to the substrate. Coating thickness is further controlled such that biosorption of the polymer, drug, and/or other materials delivered in the coating to the substrate is suitable for the intended application. Thickness of any one e-RESS film layer on a substrate may be selected in the range from about 0.1 μm to about 100 μm. For biomedical applications and devices, individual e-RESS film layers may be selected in the range from about 5 μm to about 10 μm. Because thickness will depend on the intended application, no limitations are intended by the exemplary or noted ranges. Quality of the coatings can be inspected, e.g., spectroscopically.


Quantity of Coating Solutes Delivered

Total weight of solutes delivered through the expansion nozzle during the coating process is given by Equation [4], as follows:










Total






Wt
.




Delivered







(
g
)


=

Flow






(

mL
sec

)

×

Conc
.




in






S





C





F





Soln






(

g
mL

)

×
Time






(
sec
)






[
4
]







Weight of coating solute deposited onto a selected substrate (e.g., a medical stent) is given by Equation [5], as follows:

Total Wt. Collected (g)=Σ1N[(Wt(after)−Wt(before)]  [5]


In Equation [5], (N) is the number of substrates or stents. The coating weight is represented as the total weight of solute (e.g., polymer, drug, etc.) collected on all substrates (e.g., stents) present in the deposition vessel divided by the total number of substrates (e.g., stents).


Coating Efficiency

“Coating efficiency” as used herein means the quantity of coating particles that are actually incorporated into a coating deposited on a surface of a substrate (e.g., stent). The coating efficiency normalized per surface is given by Equation [6], as follows:










Coating





Efficiency





per





Stent






(
Normalized
)


=



(


TotalWt
.
Collected



No
.
of






Stents


)


(


TotalWt
.
Delivered


12





Stents


)


×
100





[
6
]







A coating efficiency of 100% represents the condition in which all of the coating particles emitted in the RESS expansion are collected and incorporated into the coating on the substrate.


In three exemplary tests involving three (3) stents coated using the auxiliary emitter, coating efficiency values were: 45.6%, 39.6%, and 38.4%, respectively. Two tests without use of the auxiliary emitter gave coating efficiency values of 7.1% and 8.4%, respectively. Results demonstrate that certain embodiments enhance the charge and the collection (deposition) efficiency of the coating particles as compared to similar processes without the auxiliary emitter (i.e., charged ions). In particular, coating efficiencies with the auxiliary emitter are on the order of −45% presently, representing a 5-fold enhancement over conventional RESS coatings performed under otherwise comparable conditions without the auxiliary emitter. Results further show that e-RESS coatings can be effectively sintered (e.g., using heat sintering and/or gas/solvent sintering) to form dense, thermally stable single and multilayer films.


Coating Density

Particles that form coatings on a substrate can achieve a maximum density defined by particle close packing theory. For spherical particles of uniform size, this theoretical maximum is about 60 volume %. e-RESS coating particles prepared from various materials described herein (e.g., polymers and drugs) can be applied as single layers or as multiple layers at selected coating densities, e.g., on medical devices. Coatings applied in conjunction with some embodiments can be selected at coating densities of from about 1 volume % to about 60 volume %. Factors that define coating densities for selected applications include, but are not limited to, e.g., time of deposition, rate of deposition, solute concentrations, solvent ratios, number of coating layers, and combinations of these factors. In various embodiments, coatings composed of biosorbable polymers have been shown to produce coatings with selectable coating densities. In one exemplary test, a coating that included poly(lactic-co-glycolic acid, or PLGA) polymer at a solute concentration of 1 mg/mL was used to generate a coating density greater than about 5 volume % on a stent device, but density is not limited thereto. These coated polymers have also been shown to effectively release these drugs at the various coating densities selected. Coatings applied in some embodiments show an improvement in weight gain, an enhanced coating density, and a low dendricity.


Dendricity Rating

Dendricity (or dendricity rating) is a qualitative measure that assesses the quality of a particular coating deposited in some embodiments on a scale of 1 (low dendricity) to 10 (high dendricity). A high dendricity rating is given to coatings that have a fuzzy or shaggy appearance under magnification, include a large quantity of fibers or particle accumulations on the surface, and have a poor coating density (<1 volume %). A low dendricity rating is given to coatings that are uniform, smooth, and have a high coating density (>1 volume %). Low dendricity e-RESS coatings produce more uniform and dense layers, which are advantageous for selected applications, including, e.g., coating of medical devices for use in biomedical applications. FIG. 6 is an optical micrograph that shows a stent 34 (˜160× magnification) with an enhanced e-RESS (PLGA) coating that is non-dendritic that was applied in conjunction with the auxiliary emitter of the invention described herein. In the figure, the coating on stent 34 is uniform, has a high coating density (˜10 volume %). This coating contrasts with the dendritic coating shown previously in FIG. 1 with a low coating density (˜0.01 volume %).


While an exemplary embodiment has been shown and described, it will be apparent to those skilled in the art that many changes and modifications may be made without departing from the invention in its true scope and broader aspects. The appended claims are therefore intended to cover all such changes and modifications as fall within the spirit and scope of the invention.


The following examples will promote a further understanding of the invention and various aspects thereof.


EXAMPLE 1
Coating Tests

Coating efficiency tests were conducted in a deposition vessel (e.g., 8-liter glass bell jar) centered over a base platform equipped with an auxiliary emitter and e-RESS expansion nozzle assembly. The invention auxiliary emitter was positioned at the top of, and external to, the deposition vessel. The auxiliary emitter was configured with a 1st auxiliary electrode consisting of a central stainless steel rod (⅛-inch diameter) having a tapered tip that was grounded, and a ring collector (⅛-inch copper) as a 2nd auxiliary electrode. Charged ions from the auxiliary emitter were carried in (e.g., N2) carrier gas into the deposition vessel. An exemplary flow rate of pure carrier gas (e.g., N2) through the auxiliary emitter was 4.5 L/min. The auxiliary emitter was operated at an exemplary current of 1 μA under current/feedback control. The e-RESS expansion nozzle assembly included a metal sheath, as a first e-RESS electrode composed of a length (˜4 inches) of stainless steel tubing (¼-inch O.D.) that surrounded an equal length of tubing ( 1/16-inch O.D.×0.0025-inch I.D.) composed of poly-ethyl-ethyl-ketone (PEEK) (IDEX, Northbrook, Ill., USA). The first e-RESS electrode was grounded. Three (3) stents, acting collectively as a 2nd e-RESS electrode, were mounted on twisted wire stent holders at positions 1, 4, and 9 of a 12-position, non-rotating stage equidistant from the e-RESS expansion nozzle. Wire stent holders were capped at the terminal ends with plastic beads to prevent coronal discharge. A voltage of −15 kV was applied to the stents. The vessel was purged with dry (N2) gas for >20 minutes to give a relative humidity below about 0.1%. A 50:50 Poly(DL-lactide-co-glycolide) bioabsorbable polymer (Catalog No. B6010-2P) available commercially (LACTEL® Absorbable Polymers, a division of Durectel, Corp., Pelham, Ala., U.S.A.) was prepared in a fluorohydrocarbon solvent (e.g., R-236ea [M.W. 152.04 g/moL], Dyneon, Oaksdale, Minn., USA) at a concentration of 1 mg/mL. The solvent solution was delivered through the expansion nozzle at a pressure of 5500 psi and an initial temperature of 150° C. Polymer expansion solution prepared in fluoropropane solvent (i.e., R-236ea) was sprayed at a pump flow rate of 7.5 mL/min for a time of ˜90 seconds. Flow rate of R-236ea gas [Pump flow rate (ml/min)×p(g/ml)×(1/MW (g/mol))×STP (L/mol)=L/min] was 1.7 L/min. Percentage of fluoropropane gas (R-236ea, Dyneon, Oakdale, Minn., USA) and N2 gas in the enclosure vessel was: 27% [(1.7/(1.7+4.5))×100=27%] and 73%, respectively. Moles of each gas in the enclosure vessel were 0.096 moles (R-236ea) and 0.26 moles (N2), respectively. Mole fractions for each gas in the enclosure vessel were 0.27 (R-236ea) and 0.73 (N2), respectively. Viscosity (at STP) of the gas mixture (R-236ea and N2) in the enclosure vessel at the end of the experiment was calculated from the Chapman-Enskog relation to be (minus) −14.5 μPa·sec.


Weight gains on each of the three stents from deposited coatings were: 380 μg, 430 μg, and 450 μg, respectively. In a second test, polymer expansion solution was sprayed for a time of ˜60 seconds at a flow rate of 7.4 mL/min. Charged ions from the auxiliary emitter were carried into the deposition vessel using (N2) gas at a flow rate of 6.5 L/min. Weight gains for each of the three stents from deposited coatings were: 232 μg, 252 μg, and 262 μg, respectively. In tests 1 and 2, moderate-to-heavy coatings were deposited to the stents. Test results showed the first stent had a lower coating weight that was attributed to: location on the mounting stage relative to the expansion nozzle, and lack of rotation of both the stent and stage. Dendricity values of from 1 to 2 were typical, as assessed by the minimal quantity of dendrite fibers observed (e.g., 50× magnification) on the surface. Collection efficiencies for these tests were 45.4% and 40.3%, respectively.


EXAMPLE 2
Coatings Deposited Absent the Auxiliary Emitter

A test was performed as in Example 1 without use of the auxiliary emitter. Weight gains from deposited coatings for each of three stents were: 22 μg, 40 μg, and 42 μg, respectively. Coating efficiency for the test was 5.0%. Results showed coatings on the stents were light, non-uniform, and dendritic. Coatings were heaviest at the upper end of the stents and had a dendricity rating of ˜7, on average. Heavier coatings were observed near the top of the stents. Lighter coatings were observed at the mid-to-lower end of the stents, with some amount of the metal stent clearly visible through the coatings.


EXAMPLE 3
Effect of Increasing Emitter Current on Deposited Polymer Weight/Structure

A dramatic effect is observed in weight gains for applied coatings at the initial onset of auxiliary emitter current. A gradual increase in weight gains occurs with increasing current between about 0.1 μA and 1 μA. Thereafter, a gradual decrease in weight gains occurs with change in auxiliary emitter current between about 1 μA and 5 μA, most likely due to a saturation of charge transferred to particles by the auxiliary emitter.


CONCLUSIONS

Use of an auxiliary emitter has demonstrated improvement in quality (e.g., dendricity, density, and weight) of electrostatically collected (deposited) coating particles on substrate surfaces. The auxiliary emitter has particular application to e-RESS coating processes, which coatings previous to the invention have been susceptible to formation of dendritic features.

Claims
  • 1. A system for electrostatic deposition of particles upon a charged substrate to form a coating on a surface of said substrate, the system comprising: a vessel;an expansion nozzle that releases coating particles having a first average electric potential suspended in a gaseous phase from a near-critical or supercritical fluid that is expanded through said nozzle; at a first location into said vessel;andan auxiliary emitter that generates a stream of charged ions having a second average electric potential in an inert carrier gas at a second location into said vessel, the second location being separated from the first location, wherein said auxiliary emitter comprises an electrode having a tapered end that extends into a gas channel that conducts said stream of charged ions in said inert carrier gas toward said charged coating particles;whereby said coating particles interact with said charged ions and said carrier gas within said vessel to enhance a charge differential between said coating particles and said substrate.
  • 2. The system of claim 1, wherein the coating particles have a first velocity upon release of the coating particles from the expansion nozzle that is less than a second velocity of the coating particles when said coating particles impact said substrate.
  • 3. The system of claim 2, wherein the second velocity is in the range from about 0.1 cm/sec to about 100 cm/sec.
  • 4. The system of claim 1, wherein attraction of the coating particles to the substrate is increased as compared to attraction of the coating particles to the substrate in a system without the auxiliary emitter.
  • 5. The system of claim 1, wherein the first average electric potential is different than the second average electric potential.
  • 6. The system of claim 1, wherein an absolute value of the first average electric potential is less than an absolute value of the second average electric potential, and wherein a polarity of the charged ions is the same as a polarity of the coating particles.
  • 7. The system of claim 1, wherein said auxiliary emitter further comprises a capture electrode.
  • 8. The system of claim 1, wherein said substrate is positioned in a circumvolving orientation around said expansion nozzle.
  • 9. The system of claim 1, wherein said substrate comprises a conductive material.
  • 10. The system of claim 1, wherein said substrate comprises a semi-conductive material.
  • 11. The system of claim 1, wherein said substrate comprises a polymeric material.
  • 12. The system of claim 1, wherein said charged ions at said second electric potential are a positive corona or a negative corona positioned between the expansion nozzle and said substrate.
  • 13. The system of claim 1, wherein said charged ions at said second electric potential are a positive corona or a negative corona positioned between the auxiliary emitter and said substrate.
  • 14. The system of claim 1, wherein said coating particles comprises at least one of: polylactic acid (PLA); poly(lactic-co-glycolic acid) (PLGA); polycaprolactone (poly(e-caprolactone)) (PCL), polyglycolide (PG) or (PGA), poly-3-hydroxybutyrate; LPLA poly(l-lactide), DLPLA poly(dl-lactide), PDO poly(dioxolane), PGA-TMC, 85/15 DLPLG p(dl-lactide-co-glycolide), 75/25 DLPLG, 65/35 DLPLG, 50/50 DLPLG, TMC poly(trimethylcarbonate), p(CPP:SA) poly(1,3-bis-p-(carboxyphenoxy)propane-co-sebacic acid) and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, or copolymers thereof.
  • 15. The system of claim 1, wherein said coating particles comprise at least one of: polyester, aliphatic polyester, polyanhydride, polyethylene, polyorthoester, polyphosphazene, polyurethane, polycarbonate urethane, aliphatic polycarbonate, silicone, a silicone containing polymer, polyolefin, polyamide, polycaprolactam, polyamide, polyvinyl alcohol, acrylic polymer, acrylate, polystyrene, epoxy, polyethers, celluiosics, expanded polytetrafluoroethylene, phosphorylcholine, polyethyleneyerphthalate, polymethylmethavrylate, poly(ethylmethacrylate/n-butylmethacrylate), parylene C, polyethylene-co-vinyl acetate, polyalkyl methacrylates, polyalkylene-co-vinyl acetate, polyalkylene, polyalkyl siloxanes, polyhydroxyalkanoate, polyfluoroalkoxyphasphazine, poly(styrene-b-isobutylene-b-styrene), poly-butyl methacrylate, poly-byta-diene, and blends, combinations, homopolymers, condensation polymers, alternating, block, dendritic, crosslinked, or copolymers thereof.
  • 16. The system of claim 1, wherein said coating particles have a size between about 0.01 micrometers and about 10 micrometers.
  • 17. The system of claim 1, wherein the coating has a density on said surface in the range from about 1 volume % to about 60 volume %.
  • 18. The system of claim 1, wherein the coating is a multilayer coating.
  • 19. The system of claim 1, wherein said substrate is a medical implant.
  • 20. The system of claim 1, wherein said substrate is an interventional device.
  • 21. The system of claim 1, wherein said substrate is a diagnostic device.
  • 22. The system of claim 1, wherein said substrate is a surgical tool.
  • 23. The system of claim 1, wherein said substrate is a stent.
  • 24. The system of claim 1, wherein the coating is non-dendritic as compared to a baseline average coating thickness.
  • 25. The system of claim 24, wherein no coating extends more than 0.5 microns from the baseline average coating thickness.
  • 26. The system of claim 24, wherein no coating extends more than 1 micron from the baseline average coating thickness.
  • 27. The system of claim 1, wherein the coating is non-dendritic such that there is no surface irregularity of the coating greater than 0.5 microns.
  • 28. The system of claim 1, wherein the coating is non-dendritic such that there is no surface irregularity of the coating greater than 1 micron.
  • 29. The system of claim 1, wherein the coating is non-dendritic such that there is no surface irregularity of the coating greater than 2 microns following sintering of the coated substrate.
  • 30. The system of claim 1, wherein the coating is non-dendritic such that there is no surface irregularity of the coating greater than 3 microns following sintering of the coated substrate.
  • 31. A system for electrostatic deposition of particles upon a charged substrate to form a coating on a surface of a substrate, the system comprising: a vessel;an expansion nozzle that releases coating particles having a first average electric potential suspended in a gaseous phase from a near-critical or supercritical fluid that is expanded through said nozzle; at a first location into said vessel;andan auxiliary emitter that generates a stream of charged ions having a second average electric potential in an inert carrier gas at a second location into said vessel, the second location being separated from the first location, wherein said auxiliary emitter comprises a metal rod with a tapered tip and a delivery orifice;whereby said coating particles interact with said charged ions and said carrier gas within a said vessel to enhance a potential differential between said coating particles and said substrate.
CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a division of U.S. application Ser. No. 12/748,134, filed on Mar. 26, 2010, which is incorporated herein by reference in its entirety.

US Referenced Citations (378)
Number Name Date Kind
3087860 Endicott Apr 1963 A
3123077 Alcamo Mar 1964 A
3457280 Schmitt et al. Jul 1969 A
3597449 Deprospero et al. Aug 1971 A
3929992 Sehgal et al. Dec 1975 A
4000137 Dvonch et al. Dec 1976 A
4285987 Ayer et al. Aug 1981 A
4289278 Itoh Sep 1981 A
4326532 Hammar Apr 1982 A
4336381 Nagata et al. Jun 1982 A
4582731 Smith Apr 1986 A
4655771 Wallsten Apr 1987 A
4733665 Palmaz Mar 1988 A
4734227 Smith Mar 1988 A
4734451 Smith Mar 1988 A
4931037 Wetterman Jun 1990 A
4950239 Gahara Aug 1990 A
4985625 Hurst Jan 1991 A
5000519 Moore Mar 1991 A
5071429 Pinchuk et al. Dec 1991 A
5090419 Palestrant Feb 1992 A
5096848 Kawamura Mar 1992 A
5106650 Hoy et al. Apr 1992 A
5158986 Cha et al. Oct 1992 A
5195969 Wang et al. Mar 1993 A
5243023 Dezern Sep 1993 A
5270086 Hamlin Dec 1993 A
5288711 Mitchell et al. Feb 1994 A
5324049 Mistrater et al. Jun 1994 A
5340614 Perman et al. Aug 1994 A
5342621 Eury Aug 1994 A
5350361 Tsukashima et al. Sep 1994 A
5350627 Nemphos et al. Sep 1994 A
5356433 Rowland et al. Oct 1994 A
5366504 Andersen et al. Nov 1994 A
5368045 Clement et al. Nov 1994 A
5372676 Lowe Dec 1994 A
5385776 Maxfield et al. Jan 1995 A
5403347 Roby et al. Apr 1995 A
5470603 Staniforth et al. Nov 1995 A
5494620 Liu et al. Feb 1996 A
5500180 Anderson et al. Mar 1996 A
5556383 Wang et al. Sep 1996 A
5562922 Lambert Oct 1996 A
5569463 Helmus et al. Oct 1996 A
5599576 Opolski Feb 1997 A
5609629 Fearnot et al. Mar 1997 A
5626611 Liu et al. May 1997 A
5626862 Brem et al. May 1997 A
5674242 Phan et al. Oct 1997 A
5725570 Heath Mar 1998 A
5800511 Mayer Sep 1998 A
5811032 Kawai et al. Sep 1998 A
5824049 Ragheb et al. Oct 1998 A
5837313 Ding et al. Nov 1998 A
5873904 Ragheb et al. Feb 1999 A
5876426 Kume et al. Mar 1999 A
5924631 Rodrigues et al. Jul 1999 A
5948020 Yoon et al. Sep 1999 A
5957975 Lafont et al. Sep 1999 A
5980972 Ding Nov 1999 A
6013855 McPherson et al. Jan 2000 A
6077880 Castillo et al. Jun 2000 A
6129755 Mathis et al. Oct 2000 A
6143037 Goldsten et al. Nov 2000 A
6143314 Chandrashekar et al. Nov 2000 A
6146356 Wang et al. Nov 2000 A
6146404 Kim et al. Nov 2000 A
6153252 Hossainy et al. Nov 2000 A
6171327 Daniel et al. Jan 2001 B1
6190699 Luzzi et al. Feb 2001 B1
6206914 Soykan et al. Mar 2001 B1
6231600 Zhong et al. May 2001 B1
6245104 Alt Jun 2001 B1
6248127 Shah et al. Jun 2001 B1
6248129 Froix Jun 2001 B1
6273913 Wright et al. Aug 2001 B1
6280802 Akedo Aug 2001 B1
6284758 Egi et al. Sep 2001 B1
6309669 Setterstrom et al. Oct 2001 B1
6319541 Pletcher et al. Nov 2001 B1
6336934 Gilson et al. Jan 2002 B1
6342062 Suon et al. Jan 2002 B1
6355691 Goodman Mar 2002 B1
6358556 Ding et al. Mar 2002 B1
6361819 Tedeschi et al. Mar 2002 B1
6364903 Tseng et al. Apr 2002 B2
6368658 Schwarz et al. Apr 2002 B1
6372246 Wei et al. Apr 2002 B1
6387121 Alt May 2002 B1
6409716 Sahatjian et al. Jun 2002 B1
6414050 Howdle et al. Jul 2002 B1
6416779 D'Augustine et al. Jul 2002 B1
6448315 Lidgren et al. Sep 2002 B1
6461644 Jackson et al. Oct 2002 B1
6495163 Jordan Dec 2002 B1
6497729 Moussy et al. Dec 2002 B1
6506213 Mandel et al. Jan 2003 B1
6517860 Rosser et al. Feb 2003 B1
6521258 Mandel et al. Feb 2003 B1
6524698 Schmoock Feb 2003 B1
6537310 Palmaz et al. Mar 2003 B1
6541033 Shah Apr 2003 B1
6572813 Zhang et al. Jun 2003 B1
6610013 Fenster et al. Aug 2003 B1
6627246 Mehta et al. Sep 2003 B2
6649627 Cecchi et al. Nov 2003 B1
6660176 Tepper et al. Dec 2003 B2
6669785 DeYoung et al. Dec 2003 B2
6669980 Hanson et al. Dec 2003 B2
6670407 Howdle et al. Dec 2003 B2
6682757 Wright Jan 2004 B1
6706283 Appel et al. Mar 2004 B1
6710059 Labrie et al. Mar 2004 B1
6720003 Cheng et al. Apr 2004 B2
6726712 Raeder-Devens et al. Apr 2004 B1
6736996 Carbonell et al. May 2004 B1
6743505 Antal et al. Jun 2004 B2
6749902 Yonker et al. Jun 2004 B2
6755871 Damaso et al. Jun 2004 B2
6756084 Fulton et al. Jun 2004 B2
6767558 Wang et al. Jul 2004 B2
6780475 Fulton et al. Aug 2004 B2
6794902 Becker et al. Sep 2004 B2
6800663 Asgarzadeh et al. Oct 2004 B2
6815218 Jacobsen et al. Nov 2004 B1
6821549 Jayaraman Nov 2004 B2
6837611 Kuo et al. Jan 2005 B2
6838089 Carlsson et al. Jan 2005 B1
6838528 Zhao Jan 2005 B2
6858598 McKearn et al. Feb 2005 B1
6860123 Uhlin et al. Mar 2005 B1
6884377 Burnham et al. Apr 2005 B1
6884823 Plerick et al. Apr 2005 B1
6897205 Beckert et al. May 2005 B2
6905555 DeYoung et al. Jun 2005 B2
6908624 Hossainy et al. Jun 2005 B2
6916800 McKearn et al. Jul 2005 B2
6923979 Fotland et al. Aug 2005 B2
6939569 Green et al. Sep 2005 B1
6973718 Sheppard et al. Dec 2005 B2
7148201 Stern et al. Dec 2006 B2
7152452 Kokish Dec 2006 B2
7160592 Rypacek et al. Jan 2007 B2
7163715 Kramer Jan 2007 B1
7169404 Hossainy et al. Jan 2007 B2
7171255 Holupka et al. Jan 2007 B2
7201750 Eggers et al. Apr 2007 B1
7201940 Kramer Apr 2007 B1
7229837 Chen Jun 2007 B2
7279174 Pacetti et al. Oct 2007 B2
7282020 Kaplan Oct 2007 B2
7308748 Kokish Dec 2007 B2
7326734 Zi et al. Feb 2008 B2
7378105 Burke et al. May 2008 B2
7419696 Berg et al. Sep 2008 B2
7429378 Serhan et al. Sep 2008 B2
7444162 Hassan Oct 2008 B2
7455688 Furst et al. Nov 2008 B2
7456151 Li et al. Nov 2008 B2
7462593 Cuttitta et al. Dec 2008 B2
7485113 Varner et al. Feb 2009 B2
7488389 Osawa Feb 2009 B2
7524865 D'Amato et al. Apr 2009 B2
7537610 Reiss May 2009 B2
7537785 Loscalzo et al. May 2009 B2
7553827 Attawia et al. Jun 2009 B2
7713538 Lewis et al. May 2010 B2
7727275 Betts et al. Jun 2010 B2
7763277 Canham et al. Jul 2010 B1
7837726 Von Oepen et al. Nov 2010 B2
7919108 Rees et al. Apr 2011 B2
7955383 Krivoruchko et al. Jun 2011 B2
7972661 Pui et al. Jul 2011 B2
8298565 Taylor et al. Oct 2012 B2
8758429 Taylor et al. Jun 2014 B2
8795762 Fulton et al. Aug 2014 B2
8834913 Shaw et al. Sep 2014 B2
20010026804 Boutignon Oct 2001 A1
20010034336 Shah et al. Oct 2001 A1
20010044629 Stinson Nov 2001 A1
20010049551 Tseng et al. Dec 2001 A1
20020007209 Scheerder et al. Jan 2002 A1
20020051845 Mehta et al. May 2002 A1
20020082680 Shanley et al. Jun 2002 A1
20020091433 Ding et al. Jul 2002 A1
20020099332 Slepian et al. Jul 2002 A1
20020125860 Schworm et al. Sep 2002 A1
20020133072 Wang et al. Sep 2002 A1
20020144757 Craig et al. Oct 2002 A1
20030001830 Wampler et al. Jan 2003 A1
20030031699 Van Antwerp Feb 2003 A1
20030077200 Craig et al. Apr 2003 A1
20030088307 Shulze et al. May 2003 A1
20030125800 Shulze et al. Jul 2003 A1
20030143315 Pui et al. Jul 2003 A1
20030170305 O'Neil et al. Sep 2003 A1
20030180376 Dalal et al. Sep 2003 A1
20030185964 Weber et al. Oct 2003 A1
20030204238 Tedeschi Oct 2003 A1
20030222017 Fulton et al. Dec 2003 A1
20030222018 Yonker et al. Dec 2003 A1
20030222019 Fulton et al. Dec 2003 A1
20030232014 Burke et al. Dec 2003 A1
20040013792 Epstein et al. Jan 2004 A1
20040018228 Fischell et al. Jan 2004 A1
20040022853 Ashton et al. Feb 2004 A1
20040044397 Stinson Mar 2004 A1
20040059290 Palasis Mar 2004 A1
20040106982 Jalisi Jun 2004 A1
20040122205 Nathan Jun 2004 A1
20040126542 Fujiwara et al. Jul 2004 A1
20040143317 Stinson et al. Jul 2004 A1
20040157789 Geall Aug 2004 A1
20040170685 Carpenter et al. Sep 2004 A1
20040193177 Houghton et al. Sep 2004 A1
20040193262 Shadduck Sep 2004 A1
20040220660 Shanley et al. Nov 2004 A1
20040224001 Pacetti et al. Nov 2004 A1
20040236416 Falotico Nov 2004 A1
20040260000 Chaiko Dec 2004 A1
20050003074 Brown et al. Jan 2005 A1
20050004661 Lewis et al. Jan 2005 A1
20050010275 Sahatjian et al. Jan 2005 A1
20050015046 Weber et al. Jan 2005 A1
20050019747 Anderson et al. Jan 2005 A1
20050038498 Dubrow et al. Feb 2005 A1
20050048121 East et al. Mar 2005 A1
20050049694 Neary Mar 2005 A1
20050069630 Fox et al. Mar 2005 A1
20050070990 Stinson Mar 2005 A1
20050075714 Cheng et al. Apr 2005 A1
20050079199 Heruth et al. Apr 2005 A1
20050079274 Palasis et al. Apr 2005 A1
20050084533 Howdle et al. Apr 2005 A1
20050131513 Myers Jun 2005 A1
20050147734 Seppala et al. Jul 2005 A1
20050166841 Robida Aug 2005 A1
20050175772 Worsham et al. Aug 2005 A1
20050177223 Palmaz Aug 2005 A1
20050191491 Wang et al. Sep 2005 A1
20050196424 Chappa Sep 2005 A1
20050208102 Schultz Sep 2005 A1
20050216075 Wang et al. Sep 2005 A1
20050238829 Motherwell et al. Oct 2005 A1
20050255327 Chaney et al. Nov 2005 A1
20050260186 Bookbinder et al. Nov 2005 A1
20050268573 Yan Dec 2005 A1
20050288481 DesNoyer et al. Dec 2005 A1
20060001011 Wilson et al. Jan 2006 A1
20060020325 Burgermeister et al. Jan 2006 A1
20060030652 Adams et al. Feb 2006 A1
20060045901 Weber Mar 2006 A1
20060089705 Ding et al. Apr 2006 A1
20060093771 Rypacek et al. May 2006 A1
20060094744 Maryanoff et al. May 2006 A1
20060116755 Stinson Jun 2006 A1
20060121080 Lye et al. Jun 2006 A1
20060121089 Michal et al. Jun 2006 A1
20060134211 Lien et al. Jun 2006 A1
20060136041 Schmid et al. Jun 2006 A1
20060147698 Carroll et al. Jul 2006 A1
20060153729 Stinson et al. Jul 2006 A1
20060160455 Sugyo et al. Jul 2006 A1
20060188547 S. Bezwada Aug 2006 A1
20060193886 Owens et al. Aug 2006 A1
20060193887 Owens et al. Aug 2006 A1
20060193890 Owens et al. Aug 2006 A1
20060198868 DeWitt et al. Sep 2006 A1
20060210638 Liversidge et al. Sep 2006 A1
20060210639 Liversidge et al. Sep 2006 A1
20060216324 Stucke et al. Sep 2006 A1
20060222756 Davila et al. Oct 2006 A1
20060228415 Oberegger et al. Oct 2006 A1
20060276877 Owens et al. Dec 2006 A1
20060276885 Owens et al. Dec 2006 A1
20070009564 McClain et al. Jan 2007 A1
20070032864 Furst et al. Feb 2007 A1
20070038227 Massicotte et al. Feb 2007 A1
20070059350 Kennedy et al. Mar 2007 A1
20070110888 Radhakrishnan et al. May 2007 A1
20070123973 Roth et al. May 2007 A1
20070123977 Cottone et al. May 2007 A1
20070128274 Zhu et al. Jun 2007 A1
20070148251 Hossainy et al. Jun 2007 A1
20070154554 Burgermeister et al. Jul 2007 A1
20070196423 Ruane et al. Aug 2007 A1
20070198081 Castro et al. Aug 2007 A1
20070203569 Burgermeister et al. Aug 2007 A1
20070259017 Francis Nov 2007 A1
20070280992 Margaron et al. Dec 2007 A1
20080051866 Chen et al. Feb 2008 A1
20080071359 Thornton et al. Mar 2008 A1
20080075753 Chappa Mar 2008 A1
20080077232 Nishide Mar 2008 A1
20080095919 McClain et al. Apr 2008 A1
20080097575 Cottone Apr 2008 A1
20080097591 Savage et al. Apr 2008 A1
20080107702 Jennissen May 2008 A1
20080118543 Pacetti et al. May 2008 A1
20080124372 Hossainy et al. May 2008 A1
20080138375 Yan et al. Jun 2008 A1
20080206304 Lindquist et al. Aug 2008 A1
20080213464 O'Connor Sep 2008 A1
20080255508 Wang Oct 2008 A1
20080255510 Wang Oct 2008 A1
20080269449 Chattopadhyay et al. Oct 2008 A1
20080292776 Dias et al. Nov 2008 A1
20080003006 McKinnon et al. Dec 2008 A1
20080300669 Hossainy Dec 2008 A1
20090027947 Takeda Jan 2009 A1
20090043379 Prescott Feb 2009 A1
20090062909 Taylor et al. Mar 2009 A1
20090068266 Raheja et al. Mar 2009 A1
20090076446 Dubuclet, IV et al. Mar 2009 A1
20090082855 Borges et al. Mar 2009 A1
20090098178 Hofmann et al. Apr 2009 A1
20090105809 Lee et al. Apr 2009 A1
20090110711 Trollsas et al. Apr 2009 A1
20090111787 Lim et al. Apr 2009 A1
20090123515 Taylor et al. May 2009 A1
20090186069 DeYoung et al. Jul 2009 A1
20090202609 Keough et al. Aug 2009 A1
20090216317 Cromack et al. Aug 2009 A1
20090227949 Knapp et al. Sep 2009 A1
20090231578 Ling et al. Sep 2009 A1
20090263460 McDonald Oct 2009 A1
20090002927 Nesbitt et al. Nov 2009 A1
20090285974 Kerrigan et al. Nov 2009 A1
20090292351 McClain et al. Nov 2009 A1
20090292776 Nesbitt et al. Nov 2009 A1
20090003006 Conte et al. Dec 2009 A1
20090297578 Trollsas et al. Dec 2009 A1
20090300689 Conte et al. Dec 2009 A1
20100015200 McClain et al. Jan 2010 A1
20100030261 McClain Feb 2010 A1
20100042206 Yadav et al. Feb 2010 A1
20100055145 Betts et al. Mar 2010 A1
20100055294 Wang et al. Mar 2010 A1
20100063570 Pacetti et al. Mar 2010 A1
20100063580 McClain et al. Mar 2010 A1
20100074934 Hunter Mar 2010 A1
20100155496 Stark et al. Jun 2010 A1
20100166869 Desai et al. Jul 2010 A1
20100196482 Radovic-Moreno et al. Aug 2010 A1
20100198330 Hossainy et al. Aug 2010 A1
20100198331 Rapoza et al. Aug 2010 A1
20100198343 Hossainy et al. Aug 2010 A1
20100211164 McClain et al. Aug 2010 A1
20100228348 McClain et al. Sep 2010 A1
20100233332 Xing et al. Sep 2010 A1
20100239635 McClain et al. Sep 2010 A1
20100241220 McClain et al. Sep 2010 A1
20100256746 Taylor et al. Oct 2010 A1
20100256748 Taylor et al. Oct 2010 A1
20100272778 McClain et al. Oct 2010 A1
20100298928 McClain et al. Nov 2010 A1
20110009953 Luk et al. Jan 2011 A1
20110034422 Kannan et al. Feb 2011 A1
20110159069 Shaw et al. Jun 2011 A1
20110160751 Granja Filho Jun 2011 A1
20110190864 McClain et al. Aug 2011 A1
20110238161 Fulton et al. Sep 2011 A1
20110257732 McClain et al. Oct 2011 A1
20110264190 McClain et al. Oct 2011 A1
20110301697 Hoffmann et al. Dec 2011 A1
20120064124 McClain et al. Mar 2012 A1
20120064143 Sharp et al. Mar 2012 A1
20120065723 Drasler et al. Mar 2012 A1
20120101566 Mews et al. Apr 2012 A1
20120150275 Shaw-Klein Jun 2012 A1
20120172787 McClain et al. Jul 2012 A1
20120177742 McClain et al. Jul 2012 A1
20120271396 Zheng et al. Oct 2012 A1
20120280432 Chen et al. Nov 2012 A1
20120323311 McClain et al. Dec 2012 A1
20130006351 Taylor et al. Jan 2013 A1
20130172853 McClain et al. Jul 2013 A1
Foreign Referenced Citations (99)
Number Date Country
2589761 Dec 2004 CA
1465410 Jan 2004 CN
1649551 Aug 2005 CN
0604022 Jun 1994 EP
0982041 Mar 2000 EP
1195822 Apr 2002 EP
1454677 Sep 2004 EP
2197070 Jun 2010 EP
2293357 Mar 2011 EP
2293366 Mar 2011 EP
1994-098902 Apr 1994 JP
H09-056807 Mar 1997 JP
2003-205037 Jul 2003 JP
2003-533286 Nov 2003 JP
2003-5339493 Nov 2003 JP
2003533492 Nov 2003 JP
2004-158458 Jun 2004 JP
2004173770 Jun 2004 JP
2004-529674 Sep 2004 JP
2005-505318 Feb 2005 JP
2005-523119 Aug 2005 JP
2005-523332 Aug 2005 JP
2005-296690 Oct 2005 JP
2009-501566 Jan 2009 JP
10-2004-0034064 Apr 2004 KR
WO-9506487 Mar 1995 WO
WO-9620698 Jul 1996 WO
WO-9745502 Dec 1997 WO
WO-0154662 Aug 2001 WO
WO-01-87371 Nov 2001 WO
WO-0187372 Nov 2001 WO
WO-0240702 May 2002 WO
WO-0243799 Jun 2002 WO
WO-02-074194 Sep 2002 WO
WO-02090085 Nov 2002 WO
WO-03039553 May 2003 WO
WO-03-082368 Oct 2003 WO
WO-03101624 Dec 2003 WO
WO-2004009145 Jan 2004 WO
WO-2004028589 Apr 2004 WO
WO-2004043506 May 2004 WO
WO-2004045450 Jun 2004 WO
WO-2004098574 Nov 2004 WO
WO-2005042623 May 2005 WO
WO-2005063319 Jul 2005 WO
WO-2005069889 Aug 2005 WO
WO-2005117942 Dec 2005 WO
WO-2006014534 Feb 2006 WO
WO-2006052575 May 2006 WO
WO-2006065685 Jun 2006 WO
WO-2006083796 Aug 2006 WO
WO-2006099276 Sep 2006 WO
WO-2007-002238 Jan 2007 WO
WO 2007011707 Jan 2007 WO
WO-2007011708 Jan 2007 WO
WO-2007092179 Aug 2007 WO
WO-2007127363 Nov 2007 WO
WO 2007143609 Dec 2007 WO
WO-2008042909 Apr 2008 WO
WO-2008046641 Apr 2008 WO
WO-2008046642 Apr 2008 WO
WO-2008052000 May 2008 WO
2008070996 Jun 2008 WO
WO-2008070996 Jun 2008 WO
WO-2008086369 Jul 2008 WO
WO 2008131131 Oct 2008 WO
WO-2008148013 Dec 2008 WO
2009051780 Apr 2009 WO
WO 2009051780 Apr 2009 WO
WO-20090146209 Dec 2009 WO
WO-2010009335 Jan 2010 WO
WO-2010075590 Jul 2010 WO
WO-2010111196 Sep 2010 WO
WO-2010111196 Sep 2010 WO
WO-2010111232 Sep 2010 WO
WO-2010111232 Sep 2010 WO
WO-2010111238 Sep 2010 WO
WO-2010111238 Sep 2010 WO
WO-2010111238 Oct 2010 WO
WO-2010120552 Oct 2010 WO
WO-2010121187 Oct 2010 WO
WO-2010121187 Oct 2010 WO
WO-2011009096 Jan 2011 WO
WO-2011097103 Aug 2011 WO
WO-2011119762 Sep 2011 WO
WO-2011130448 Oct 2011 WO
WO-2011133655 Oct 2011 WO
WO-2012009684 Jan 2012 WO
WO-2012034079 Mar 2012 WO
WO-2012082502 Jun 2012 WO
WO-2012092504 Jul 2012 WO
WO-2012142319 Oct 2012 WO
WO-2012166819 Dec 2012 WO
WO-2013012689 Jan 2013 WO
WO-2013025535 Feb 2013 WO
WO-2013059509 Apr 2013 WO
WO-2013173657 Nov 2013 WO
WO-2013177211 Nov 2013 WO
WO-2014063111 Apr 2014 WO
Non-Patent Literature Citations (395)
Entry
Abreu Filho et al., “Influence of metal alloy and the profile of coronary stents in patients with multi-vessel coronary disease.” Clinics 66(6):985-989 (2011).
Akoh et al., “One-Stage Synthesis of Raffinose Fatty Acid Polyesters.” Journal Food Science 52:1570 (1987).
Albert et al., “Antibiotics for preventing recurrent urinary tract infection in non-pregnant women.” Cochrane Database System Rev. 3, CD001209 (2004).
Au et al., “Methods to improve efficacy of intravesical mitomycin C: Results of a randomized phase III trial.” Journal of the National Cancer Institute, 93(8), 597-604 (2001).
AU2006270221 Exam Report dated Apr. 6, 2010.
AU2007243268 Exam Report dated May 15, 2013.
AU2007243268 Exam Report dated Aug. 31, 2011.
AU2009251504 Exam Report dated Dec. 8, 2011.
AU2009270849 Exam Report dated Feb. 14, 2012.
AU2011232760 Exam Report dated Apr. 10, 2013.
AU2011256902 Exam Report dated Jun. 13, 2013.
AU2012203203 Exam Report dated Apr. 12, 2013.
AU2012203577 Exam Report dated Jun. 7, 2013.
AU2011256902 Office Action dated Jun. 10, 2014.
Balss et al., “Quantitative spatial distribution of sirolumus and polymers in drug-eluting stents using confocal Raman microscopy.” J. of Biomedical Materials Research Part A, 258-270 (2007).
Belu et al., “Three-Dimensional Compositional Analysis of Drug Eluting Stent Coatings Using Cluster Secondary Loan Mass Spectroscopy.” Anal. Chem. 80:624-632 (2008).
Belu, et al., “Chemical imaging of drug eluting coatings: Combining surface analysis and confocal Rama microscopy.” J. Controlled Release 126: 111-121 (2008).
Boneff, “Topical Treatment of Chronic Prostatitis and Premature Ejaculation,” International Urology and Nephrology 4(2):183-186 (1971).
Bookbinder et al., “A recombinant human enzyme for enhanced interstitial transport of therapeutics.” Journal of Controlled Release 114:230-241 (2006).
Borchert et al., “Prevention and treatement of urinary tract infection with probiotics: Review and research perspective,” Indian Journal Urol. 24(2):139-144 (2008).
Brunstein et al., “Histamine, a vasoactive agent with vascular disrupting potential improves tumour response by enhancing local drug delivery,” British Journal of Cancer 95:1663-1669 (2006).
CA 2757276 Office Action dated Feb. 15, 2013.
CA 2757276 Office Action dated Feb. 5, 2014.
CA 2794704 Office Action dated Feb. 7, 2014.
CA 2613280 Office Action dated Oct. 2, 2012.
CA 2615452 Office Action dated Dec. 19, 2012.
CA 2615452 Office Action dated Oct. 8, 2013.
CA 2650590 Office Action dated Jul. 23, 2013.
CA 2613280 Office Action dated Dec. 10, 2013.
CA 2667228 Office Action dated Jan. 22, 2014.
CA 2679712 Office Action dated Feb. 24, 2014.
CA 2684482 Office Action dated Nov. 10, 2011.
CA 2684482 Office Action dated Jul. 11, 2012.
CA 2688314 Office Action dated Jun. 6, 2012.
CA 2667228 Office Action dated May 7, 2013.
CA 2730995 Office Action dated May 29, 2013.
CA 2730995 Office Action dated Sep. 26, 2012.
CA 2730995 Office Action dated Feb. 20, 2014.
CA 2756307 Office Action dated Feb. 18, 2013.
CA 2756307 Office Action dated Mar. 24,2014.
CA 2756386 Office Action dated Mar. 15, 2013.
CA 2756388 Office Action dated Apr. 11, 2013.
CA 2756388 Office Action dated Apr. 14, 2014.
CA 2759015 Office Action dated Apr. 8, 2013.
CA 2759015 Office Action dated Jul. 21, 2014.
CA 2756386 Office Action dated Oct. 24, 2013.
CA 2756386 Office Action dated May 16, 2014.
CA 2805631 Office Action dated Jan. 17, 2014.
CA 2823355 Office action dated Apr. 14, 2014.
Cadieux et al., “Use of triclosan-eluting ureteral stents in patients with long-term stents.” J. Endourol (Epub) (Jun. 19, 2009).
Channon et al., “Nitric Oxide Synthase in Atherosclerosis and Vascular Injury: Insights from Experimental Gene Therapy.” Arteriosclerosis, Thrombosis and Vascular Biology, 20(8):1873-1881 (2000).
Chen et al. Immobilization of heparin on a silicone surface through a heterobifunctional PEG spacer. Biomaterials. 26(35):7418-24 (2005).
Chopek et al. “The influence of carbon fibres on the resorption time and mechanical properties of the lactide-glycolide co-polymer.” J. Biomater. Sci. Polymer Edn, vol. 18, No. 11, pp. 1355-1368 (2007).
Clair and Burks, “Thermoplastic/Melt-Processable Polyimides,” NASA Conf. Pub. #2334, pp. 337-355 (1984).
CN 2006800258093 Office Action dated May 30, 2012.
CN 200780047425.6 Office Action dated Aug. 3, 2012.
CN 200780047425.6 Office Action dated Feb. 28, 2013.
CN 200880007308.1 Office Action dated Jul. 3, 2013.
CN 200880007308.1 Office Action dated Nov. 23, 2011.
CN 200880007308.1 Office Action dated Oct. 18, 2012.
CN 200880007308.1 Office Action dated Jan. 2, 2014.
CN 200880020515 Office Action dated Jul. 22, 2013.
CN 200880020515 Office Action dated Oct. 9, 2012.
CN 200880020515 Office Action dated Apr. 15, 2014.
CN 200880100102.3 Office Action dated Apr. 11, 2013.
CN 200880100102.3 Office Action dated Jun. 1, 2012.
CN 200880100102.3 Office Action dated Dec. 11, 2013.
CN 200880100102.3 Office Action dated Aug. 27, 2014.
CN 200980122691 Office Action dated Oct. 10, 2012.
CN 200980136432.2 Office Action dated Jan. 14, 2013.
CN 200980136432.2 Office Action dated Nov. 4, 2013.
CN 200980136432.2 Office Action dated Jul. 3, 2014.
CN 201080024973.9 Office Action dated Dec. 20, 2013.
CN 201080024973.9 Office Action dated Aug. 7, 2014.
Cohen, et al. “Sintering Technique for the Preparation of Polymer Matrices for the Controlled Release of Macromolecules.” Journal of Pharmaceutical Sciences, 73:8, 1034-1037 (1984).
Colombo et al. “Selection of Coronary Stents.” Journal of the American College of Cardiology, vol. 40, No. 6, p. 1021-1033 (2002).
CRC Handbook of chemistry and physics. 71st ed. David R. Lide, Editor-in-Chief. Boca Raton, FL, CRC Press; 1990; 6-140.
Cyrus et al., “Intramural delivery of rapamycin with alphavbeta3-targeted paramagnetic nanoparticles inhibits stenosis after balloon injury.” Arterioscler Thromb Vasc Biol 28:820-826 (2008).
Derwent-Acc-No. 2004-108578 Abstracting 2004003077; Jan. 8, 2004; 3 pages.
DiStasi et al., “Percutaneous sequential bacillus Calmette-Guerin and mitomycin C for panurothelial carcinomatosis,” Can. J. Urol. 12(6):2895-2898 (2005).
Domb and Langer, “Polyanhydrides. I. Preparation of High Molecular Weight Polyanhydrides.”J. Polym Sci. 25:3373-3386 (1987).
Domingo, C. et al., “Precipication of ultrafine organic crystals from the rapid expansion of supercritical solutions over a capillary and a frit nozzle.” J. Supercritical Fluids 10:39-55 (1997).
Dzik-Jurasz, “Molecular imaging in vivo: an introduction.” The British Journal of Radiology, 76:S98-S109 (2003).
EA 200901254 Office Action dated Jul. 29, 2013.
EA 200901254/28 Office Action dated Jun. 28, 2012.
EA 201001497 Office Action dated Feb. 13, 2013.
EA 201001497 Office Action dated Jul. 29, 2013.
Electrostatic Process, Wiley Encyclopedia of Electrical and Electronics Engineering, John Wiley & Sons, Inc. 1999; 7:15-39.
Eltze et al., “Imidazoquinolinon, imidazopyridine, and isoquinolindione derivatives as novel and potent inhibitors of the poly (ADP-ribose) polymerase (PARP): a comparison with standard PARP inhibitors,” Mol. Pharmacol 74(6):1587-1598 (2008).
EP06773731.2 Search Report dated Oct. 2, 2012.
EP06787258.0 Office Action dated Mar. 15, 2013.
EP06787258.0 Search Report dated Feb. 6, 2012.
EP07756094.4 Office Action dated Jan. 21, 2014.
EP07756094.4 Office Action dated May 29, 2013.
EP07756094.4 Search Report dated Aug. 31, 2012.
EP08705772.5 Office Action dated Oct. 30, 2013.
EP08705772.5 Search Report dated Feb. 20, 2013.
EP08733210.2 Office Action dated Jul. 16, 2013.
EP08733210.2 Search Report dated Oct. 23, 2012.
EP08756215.3 Search Report dated Oct. 5, 2011.
EP08756215.3 Search Report dated Jan. 28, 2013.
EP09755571.8 Office Action dated Dec. 13, 2013.
EP09755571.8 Search Report dated Apr. 9, 2013.
EP09798764.8 Search Report dated Sep. 30, 2013.
EP09805981.9 Office Action dated Feb. 13, 2013.
EP10756676.2 Search Report dated Jan. 31, 2014.
EP10756696.0 Search Report dated Oct. 10, 2013.
EP10764884.2 Search Report dated Oct. 28, 2013.
EP10765295.0 Search Report dated Oct. 17, 2013.
EP11769546.0 Search Report dated Sep. 19, 2013.
EP10800642.0 Search Report dated Mar. 19, 2014.
EP11772624.0 Search Report dated Jun. 5, 2014.
EP09798764.8 Office Action dated Jun. 30, 2014.
Ettmayer et al. Lessons learned from marketed and investigational prodrugs. J Med Chem. 47(10):2393-404 (2004).
Fibbi et al., “Chronic inflammation in the pathogenesis of benign prostatic hyperplasia.” Int J Androl. 33(3):475-88 (2010).
Fleischmann et al., “High Expression of Gastrin-Releasing Peptide Receptors in the Vascular bed of Urinary Tract Cancers: Promising Candidates for Vascular Targeting Applications.” Endocr. Relat. Cancer 16(2):623-33 (2009).
Froehlich et al., “Conscious sedation for gastroscopy: patient tolerance and cardiorespiratory parameters,” Gastroenterology 108(3):697-704 (1995).
Fujiwara et al., “Insulin-like growth factor 1 treatment via hydrogels rescues cochlear hair cells from ischemic injury.” NeuroReport 19(16):1585-1588 (2008).
Fulton et al. Thin Fluoropolymer films and nanoparticle coatings from the rapid expansion of supercritical carbon dioxide solutions with electrostatic collection, Polymer Communication. 2627-3632 (2003).
Green et al., “Simple conjugated polymer nanoparticles as biological labels,” Proc Roy Soc A. published online Jun. 24, 2009 doi:10.1098/rspa.2009.0181.
Griebenow et al., “On Protein Denaturation in Aqueous-Organic Mixtures but not in Pure Organic Solvents,” J. Am Chem Soc., vol. 118. No. 47, 11695-11700 (1996).
Hamilos et al., “Differential effects of Drug-Eluting Stents on Local Endothelium-Dependent Coronary Vasomotion.” JACC vol. 51, No. 22, Endothelium and DES, 2123-9 (2008).
Han, et al., “Studies of a Novel Human Thrombomodulin Immobilized Substrate: Surface Characterization and Anticoagulation Activity Evaluation.” J. Biomater. Sci. Polymer Edn, 12 (10):1075-1089 (2001).
Hartmann et al., “Tubo-ovarian abscess in virginal adolescents: exposure of the underlying etiology,” J. Pediatr Adolesc Gynecol, 22(3):313-16 (2009).
Hasegawa et al., “Nylong 6/Na-montmorillonite nanocomposites prepared by compounding Nylon 6 with Na-montmorillonite slurry,” Polymer 44:2933-2937 (2003).
Hinds, WC. Aerosol Technology, Properties, Behavior and Measurement of Airborne Particles, Department of Environmental Health Sciences, Harvard University School of Public Health, Boston, Massachusetts. 1982; 283-314.
Hladik et al., “Can a topical microbicide prevent rectal HIV transmission?” PLoS Med. 5(8):e167 (2008).
Iconomidou et al., “Secondary Structure of Chorion Proteins of the Teleosatan Fish Dentex dentex by ATR FR-IR and FT-Raman Spectroscopy,” J. of Structural Biology, 132, 112-122 (2000).
ID—W00201003529 Office Action dated Apr. 28, 2014.
IL—208648 Official Notification dated Feb. 9, 2012.
IL—201550 Official Notification dated Dec. 8, 2013.
IL—202321 Office Notification dated Dec. 19, 2013.
IN—368/DELNP/2008 Exam Report dated Oct. 17, 2011.
IN—6884/DELNP/2009 Office Action dated Oct. 31, 2013.
IN—7740/DELNP/2009 Office Action dated Jul. 29, 2014.
Jackson et al., “Characterization of perivascular poly(lactic-co-glycolic acid) films containing paclitaxel” Int. J. of Pharmaceutics, 283:97-109 (2004).
Jensen et al., Neointimal hyperplasia after sirollmus-eluting and paclitaxel-eluting stend implantation in diabetic patients: the randomized diabetes and drug eluting stent (DiabeDES) intravascular ultrasound trial. European heart journal (29), pp. 2733-2741. Oct. 2, 2008. Retrieved from the Internet. Retrieved on [Jul. 17, 2012]. URL:<http://eurheartj.oxfordjournals.org/content/29/22/2733.full.pdf> entire document.
Jewell, et al., “Release of Plasmid DNA from Intravascular Stents Coated with Ultrathin Multilayered Polyelectrolyte Films” Biomacromolecules. 7: 2483-2491 (2006).
Johns, H.E, J.R.Cunningham, Thomas, Charles C., Publisher, “The Physics of Radiology,” Springfield, IL, pp. 133-143 (1983).
Joner et al. “Site-specific targeting of nanoparticle prednisolone reduces in-stent restenosis in a rabbit model of established atheroma,” Arterioscler Thromb Vasc Biol. 28:1960-1966 (2008).
Jovanovic et al. “Stabilization of Proteins in Dry Powder Formulations Using Supercritical Fluid Technology,” Pharm. Res. 21(11), (2004).
JP 2008-521633 Office Action dated Oct. 12, 2012.
JP2008-521633 Office Action dated Dec. 28, 2011.
JP-2009-534823 Office Action dated Apr. 23, 2013.
JP-2009-534823 Office Action dated Feb. 21, 2012.
JP-2009-534823 Office Action dated Sep. 20, 2012.
JP-2009-545647 Office Action dated Jun. 5, 2012.
JP-2009-545647 Office Action dated May 14, 2013.
JP-2009-545647 Office Action dated Apr. 22, 2014.
JP-2010-504253 Office Action dated Dec. 12, 2011.
JP-2010-504253 Office Action dated Dec. 7, 2012.
JP-2010-510441 Office Action dated May 7, 2013.
JP-2011-505248 Office Action dated Jun. 4, 2013.
JP-2011-518920 Office Action dated Dec. 17, 2012.
JP-2011-518920 Office Action dated Oct. 23, 2013.
JP-2012-503677 Office Action dated Jan. 18, 2013.
JP-2012-503677 Office Action dated Nov. 1, 2013.
JP-2012-151964 Office Action dated Dec. 10, 2013.
JP-2013-024508 Office Action dated May 2, 2014.
JP-2013-190903 Office Action dated Sep. 2, 2014.
Kazemi et al., “The effect of betamethasone gel in reducing sore throat, cough, and hoarseness after laryngo-tracheal intubation,” Middle East J. Anesthesiol. 19(1):197-204 (2007).
Kehinde et al., “Bacteriology of urinary tract infection associated with indwelling J ureteral stents,” J. Endourol. 18(9):891-896 (2004).
Kelly et al., “Double-balloon trapping technique for embolization of a large wide-necked superior cerebellar artery aneurysm: case report,” Neurosurgery 63(4 Suppl 2):291-292 (2008).
Khan et al., “Chemistry and the new uses of Sucrose: How Important?” Pur and Appl. Chem 56:833-844 (1984).
Khan et al., “Cyclic Acetals of 4,1′,6′-Trichloro-4,1′,6′,-Trideoxy- Trideoxy-galacto-Sucrose and their Conversion into Methyl Ether Derivatives.” Carb. Res. 198:275-283 (1990).
Khan et al., “Enzymic Regioselective Hydrolysis of Peracetylated Reducing Disaccharides, Specifically at the Anomeric Centre: Intermediates for the Synthesis of Oligosaccharides.” Tetrahedron Letters 34:7767 (1933).
Khayankarn et al., “Adhesion and Permeability of Polyimide-Clay Nanocomposite Films for Protective Coatings,” Journal of Applied Polymer Science, vol. 89, 2875-2881 (2003).
Koh et al., A novel nanostructured poly(lactic-co-glycolic-acid)-multi-walled carbon nanotube composite for blood-contacting applications: Thrombogenicity studies, Acta Biomaterialia 5:3411-3422 (2009).
KR10-2008-7003756 Office Action dated Sep. 23, 2013.
KR10-2008-7003756 Office Action dated Oct. 30, 2012.
KR 10-2013-7031237 Office Action dated Mar. 17, 2014.
Kurt et al., “Tandem oral, rectal and nasal administrations of Ankaferd Blood Stopper to control profuse bleeding leading to hemodynamic instability,” Am J. Emerg. Med. 27(5):631, e1-2 (2009).
Labhasetwar et al., “Arterial uptake of biodegradable nanoparticles: effect of surface modifications,” Journal of Pharmaceutical Sciences, vol. 87, No. 10, 1229-1234 (1998).
Lamm et al., “Bladder Cancer: Current Optimal Intravesical Treatment: Pharmacologic Treatment,” Urologic Nursing 25(5):323-6, 331-2 (Oct. 26, 2005).
Latella et al., “Nanoindentation hardness. Young's modulus, and creep behavior of organic-inorganic silica-based sol-gel thin films on copper,” J Mater Res 23(9): 2357-2365 (2008).
Lawrence et al., “Rectal tacrolimus in the treatment of resistant ulcerative proctitis,” Aliment. Pharmacol Ther. 28(10):1214-20 (2008).
Lee et al., “Novel therapy for hearing loss: delivery of insulin-like growth factor 1 to the cochlea using gelatin hydrogel,”Otol. Neurotol. 28(7):976-81 (2007).
Lehmann et al, “Drug treatment of nonviral sexually transmitted diseases: specific issues in adolescents,” Pediatr Drugs 3(7):481-494 (2001).
Mahoney et al., “Three-Dimensional Compositional Analysis of Drug Eluting Stent Coatings Using Cluster Secondary Ion mass Spectrometry,” Anal. Chem. 80:624-632 (2008).
Mario, C.D. et al., “Drug-Eluting Bioabsorbable Magnesium Stent,” J. Interventional Cardiology 16(6):391-395 (2004).
Matsumoto, D, et al. Neointimal Coverage of Sirolimus-Eluting Stents at 6-month Follow-up: Evaluated by Optical Coherence Tomography, European Heart Journal, 28:961-967 (2006).
McAlpine, J.B. et al., “Revised NMR Assignments for Rapamycine,” J. Antibiotics 44:688-690 (1991).
Mehik et al., “Alfuzosin treatment for chronic prostatitis/chronic pelvic pain syndrome: a prospecitve, randomized, double-blind, placebo-controlled, pilot study,” Urology 62(3):425-429 (2003).
Mei et al., “Local Delivery of Modified Paclitaxel-Loaded Poly( ε-caprolactone)/Pluronic F68 Nanoparticles for Long-Term Inhibition of Hyperplasia,” Journal of Pharmaceutical Sciences, vol. 98, No. 6, (Jun. 2009).
Melonakos et al., Treatment of low-grade bulbar transitional cell carcinoma with urethral instillation of mitomycin C, Adv. Urol., 173694 Epub; (2008).
Merrett et al., “Interaction of corneal cells with transforming growth factor beta2-modified poly dimethyl siloxane surfaces,” Journal of Biomedical Materials Research, Part A, vol. 67A, No. 3, pp. 981-993 (2003).
Merriam-Webster Online Dictionary, obtained online at: http://www.merriam-webster.com/dictionary/derivative, downloaded Jan. 23, 2013.
Middleton and Tipton, Synthetic biodegradable polymers as orthopedic devises. Biomaterials 21:2335-46 (2000).
Minchin, “Nanomedicine: sizing up targets with nanoparticles,” Nature Nanotechnology, 33:12-13 (2008).
Minoque et al., “Laryngotracheal topicalization with lidocaine before intubation decreases the incidence of coughing on emergence from general anesthesia,” Anesth. Analg. 99(4):1253-1257 (2004).
Mishima et al. “Microencapsulation of Proteins by Rapid Expansion of Supercritical Solution with a Nonsolvent,” AlChE J. 46(4):857-65 (2000).
Mocco et al., “Pharos neurovascular intracranail stent: Elective use for a symptomatic stenosis refractory to medical therapy,” Catheter Cardiovasc. Interv. (epub) (Mar. 2009).
Mollen et al., “Prevalence of tubo-ovarian abcess in adolescents diagnosed with pelvice inflammatory disease in a pediatric emergency department,” Pediatr. Emerg. Care, 22(9): 621-625 (2006).
Moroni et al., “Post-ischemic brain damage:targeting PARP-1 within the ischemic neurovaschular units as a realistic avenue to stroke treatment,” FEBS J. 276(1):36-45 (2009).
Muhlen et al., “Magnetic Resonance Imaging Contrast Agent Targeted Toward Activated Platelets Allows in Vivo Detection of Thrombosis and Monitoring of Thrombolysis Circulation,” 118:258-267 (2008).
Murphy et al., “Chronic prostatitis: management strategies,” Drugs 69(1): 71-84 (2009).
MX/a/2010/01148 Office Action dated Feb. 11, 2014.
NZ 588549 Examination Report dated Mar. 28, 2011.
NZ 600814 Examination Report dated Jun. 29, 2012.
O'Neil et al., “Extracellular matrix binding mixed micelles for drug delivery applications,” Journal of Controlled Release 137:146-151 (2009).
O'Donnell et al., “Salvage intravesical therapy with interferon-alpha 2b plus low dose bacillus Calmette-Guerin alone perviously failed,” Jour. Urology, 166(4):1300-1304 (2001).
Olbert et al., “In vitro and in vivo effects of CpG-Oligodeoxynucleotides (CpG-ODN) on murine transitional cell carcinoma and on the native murine urinary bladder wall,” Anticancer Res. 29(6):2067-2076 (2009).
Ong and Serruys, “Technology Insight: an overview of research in drug-eluting stents,” Nat. Clin. Perot. Cardiovas. Med. 2(12):647-658 (2005).
PCT/US06/24221 International Preliminary Report on Patentability mailed Dec. 24, 2007.
PCT/US06/24221 International Search Report mailed Jan. 29, 2007.
PCT/US06/27321 International Preliminary Report on Patentability mailed Jan. 16, 2008.
PCT/US06/27321 International Search Report mailed Oct. 16, 2007.
PCT/US06/27322 International Preliminary Report on Patentability mailed Jan. 16, 2008.
PCT/US06/27322 International Search Report mailed Apr. 25, 2007.
PCT/US07/10227 International Preliminary Report on Patentability mailed Oct. 28, 2008.
PCT/US07/10227 International Search Report mailed Aug. 8, 2008.
PCT/US07/80213 International Preliminary Report on Patentability mailed Apr. 7, 2009.
PCT/US07/80213 International Search Report mailed Apr. 16, 2008.
PCT/US07/82275 International Search Report mailed Apr. 18, 2008.
PCT/US07/82775 International Preliminary Report on Patentablity mailed Apr. 28, 2009.
PCT/US08/11852 International Preliminary Report on Patentability mailed Apr. 20, 2010.
PCT/US08/11852 International Search Report mailed Dec. 19, 2008.
PCT/US08/50536 International Preliminary Report on Patentability mailed Jul. 14, 2009.
PCT/US08/50536 International Search Report mailed Jun. 2, 2008.
PCT/US08/60671 International Preliminary Report on Patentability mailed Oct. 20, 2009.
PCT/US08/60671 International Search Report mailed Sep. 5, 2008.
PCT/US08/64732 International Preliminary Report on Patentability mailed Dec. 1, 2009.
PCT/US08/64732 International Search Report mailed Sep. 4, 2008.
PCT/US09/41045 International Preliminary Report on Patentability mailed Oct. 19, 2010.
PCT/US09/41045 International Search Report mailed Aug. 11, 2009.
PCT/US09/50883 International Preliminary Report on Patentability mailed Jan. 18, 2011.
PCT/US09/50883 International Search Report mailed Nov. 17, 2009.
PCT/US09/69603 International Preliminary Report on Patentability mailed Jun. 29, 2011.
PCT/US09/69603 International Search Report mailed Nov. 5, 2010.
PCT/US10/28195 International Preliminary Report on Patentability mailed Sep. 27, 2011.
PCT/US10/28195 Search Report and Written Opinion mailed Jan. 21, 2011.
PCT/US10/28253 International Preliminary Report on Patentability mailed Sep. 27, 2011.
PCT/US10/28253 Search Report and Written Opinion mailed Dec. 6, 2010.
PCT/US10/28265 International Report on Patentability mailed Sep. 27, 2011.
PCT/US10/28265 Search Report and Written Opinion mailed Dec. 3, 2010.
PCT/US10/29494 International Preliminary Report on Patentability mailed Oct. 4, 2011.
PCT/US10/29494 Search Report and Written Opinion mailed Feb. 7, 2011.
PCT/US10/31470 International Preliminary Report on Patentability mailed Oct. 18, 2011.
PCT/US10/31470 Search Report and Written Opinion mailed Jan. 28, 2011.
PCT/US10/42355 International Preliminary Report on Patentability mailed Jan. 17, 2012.
PCT/US10/42355 Search Report mailed Sep. 2, 2010.
PCT/US11/032371 International Report on Patentability mailed Oct. 16, 2012.
PCT/US11/032371 International Search Report mailed Jul. 7, 2011.
PCT/US11/044263 International Search Report, International Preliminary Report on Patentability and Written Opinion mailed Feb. 9, 2012.
PCT/US11/051092 International Preliminary Report on Patentability mailed Mar. 21, 2013.
PCT/US11/051092 International Search Report mailed Mar. 27, 2012.
PCT/US11/051092 Written Opinion mailed Mar. 27, 2012.
PCT/US11/22623 International Preliminary Report on Patentability mailed Aug. 7, 2012.
PCT/US11/22623 Search Report and Written Opinion mailed Mar. 28, 2011.
PCT/US11/29667 International Search Report and Written Opinion mailed Jun. 1, 2011.
PCT/US11/67921 International Preliminary Report on Patentability mailed Jul. 11, 2013.
PCT/US11/67921 Search Report and Written Opinion mailed Jun. 22, 2012.
PCT/US12/040040 International Search Report mailed Sep. 7, 2012.
PCT/US12/33367 International Preliminary Report on Patentability mailed Oct. 15, 2013.
PCT/US12/33367 International Search Report mailed Aug. 1, 2012.
PCT/US12/46545 International Search Report mailed Nov. 20, 2012.
PCT/US12/50408 International Search Report mailed Oct. 16 2012.
PCT/US13/41466 International Search Report and Written Opinion mailed Oct. 17, 2013.
PCT/US13/42093 International Search Report and Written Opinion mailed Oct. 24, 2013.
PCT/US2011/033225 International Search Report and Written Opinion mailed Jul. 7, 2011.
PCT/US2012/60896 International Search Report and Written Opinion mailed Dec. 28, 2012.
PCT/US2013/065777 International Search Report and Written Opinion mailed Jan. 29, 2014.
PCT/US2014/025017 International Search Report and Written Opinion mailed Jul. 7, 2014.
Perry et al., Chemical Engineers Handbook, 5th Edition, McGraw-Hill, New York, p. 20-106 (1973).
Plas et al., “Tubers and tumors: rapamycin therapy for benign and malignant tumors”, Curr Opin Cell Bio 21: 230-236, (2009).
Poling et al., The Properties of Gases and Liquids. McGraw-Hill. 9:1-9.97 (2001).
Pontari, “Chronic prostatitis/chronic pelvic pain syndrome in elderly men: toward better understanding and treatment,” Drugs Aging 20(15):1111-1115 (2003).
Pontari, “Inflammation and anti-inflammatory therapy in chronic prostatits,” Urology 60(6Suppl):29-33 (2002).
Putkisto, K. et al. “Polymer Coating of Paper Using Dry Surface Treatment—Coating Structure and Performance”, ePlace newsletter, vol. 1, No. 8, pp. 1-20 (2004).
Raganath et al., “Hydrogel matrix entrapping PLGA-paclitaxel microspheres: drug delivery with near zero-order release and implantability advantages for malignant brain tumour,” Pharm Res (Epub) (Jun. 20, 2009).
Ranade et al., “Physical characterization of controlled release of paclitaxel from the TAXUS Express2 drug-eluting stent,” J. Biomed Mater. Res. 71(4):625-634 (2004).
Reddy et al., “Inhibition of apoptosis through localized delivery of rapamycin-loaded nanoparticles prevented neointimal hyperplasia and reendothelialized injured artery,” Circ Cardiovasc Intery 1:209-216 (2008).
Ristikankare et al., “Sedation, topical pharnygeal anesthesia and cardiorespiratory safety during gastroscopy,” J. Clin Gastorenterol. 40(1):899-905 (2006).
Sahajanand, Medical Technologies (Supralimus Core; Jul. 6, 2008).
Salo et al., “Biofilm formation by Escherichia coli isolated from patients with urinary tract infections,” Clin Nephrol. 71(5):501-507 (2009).
Saxena et al., “Haemodialysis catheter-related bloodstream infections: current treatment options and strategies for prevention,” Swiss Med Wkly 135:127-138 (2005).
Schetsky, L. McDonald, “Shape Memory Alloys”, Encyclopedia of Chemical Technology (3d Ed), John Wiley & Sons 20:726-736 (1982).
Scheuffler et al., “Crystal Structure of Human Bone Morphogenetic Protein-2 at 2.7 Angstrom resolution,” Journal of Molecular Biology, vol. 287, Issue 1, Mar. 1999, retrieved online at http://wvwv.sciencedirect.com/science/article/pii/S002283699925901.
Schmidt et al., “A Comparison of the Mechanical Performance Characteristics of Seven Drug-Eluting Stent Systems,” Catheterization and Cardiovascular Interventions 73:350-360 (2009).
Schmidt et al., “In vitro measurement of quality parameters of stent-catheter systems,” Biomed Techn 50(S1):1505-1506 (2005).
Schmidt et al., “New aspects of in vitro testing of arterial stents based on the new European standard,” EN 14299, [online] (2009), [retrieved on Mar. 10, 2001] http://www.lib0ev.de/pl/pdf/EN14299.pdf (2009).
Schmidt et al., “Trackability, Crossability, and Pushability of Coronary Stent Systems—An Experimental Approach,” Biomed Techn 47:Erg. 1, S. 124-126 (2002).
Schreiber, S.L. et al., “Atomic Structure of the Rapamycin Human Immunophilin FKBP-12 Complex,” J. Am. Chem. Soc. 113:7433-7435 (1991).
Sen et al., “Topical heparin: A promising agent for the prevention of tracheal stenosis in airway surgery,” J. Surg. Res (Epub ahead of print) (Feb. 21, 2009).
Serruys, Patrick et al., Comparison of Coronary-Artery Bypass Surgery and Stenting for the Treatment of Multivessel Disease, N. Engl. J. Med., vol. 344, No. 15, pp. 1117-1124 (2001).
SG201007602-4 Examination Report dated Feb. 13, 2013.
SG201007602-4 Written Opinion dated May 25, 2012.
Shekunov et al. “Crystallization Processes in Pharmaceutical Technology and Drug Delivery Design.” Journal of Crystal Growth 211:122-136 (2000).
Simpson et al., “Hyaluronan and hyaluronidase in genitourinary tumors.” Front Biosci. 13:5664-5680 (2009).
Smith et al., “Mitomycin C and the endoscopic treatment of laryngotracheal stenosis: are two applications better than one?” Laryngoscope 119(2):272-283 (2009).
Sumathi et al., “Controlled comparison between betamethasone gel and lidocaine jelly applied over tracheal tube to reduce postoperative sore throat, cough, and hoarseness of voice,” Br. J. Anaesth. 100(2):215-218 (2008).
Szabadits et al., “Flexibility and trackability of laser cut coronary stent systems,” Acta Bioengineering and Biomechanics 11(3):11-18 (2009).
Testa, B. Prodrug research: futile or fertile? Biochem Pharmacol. 1:68(11):2097-106 (2004).
Thalmann et al., “Long-term experience with bacillus Calmette-Guerin therapy of upper urinary tract transitional cell carcinoma in patients not eligible for surgery,” J Urol. 168(4 Pt 1):1381-1385 (2002).
Torchlin, “Micellar Nanocarriers: Pharmaecutial Perspectives,” Pharmaceutical Research, vol. 24, No. 1, 17 pages. (2007).
U.S. Appl. No. 11/158,724 Office Action Mailed Dec. 31, 2013.
U.S. Appl. No. 11/158,724 Office Action Mailed May 23, 2013.
U.S. Appl. No. 11/158,724 Office Action Mailed Sep. 17, 2009.
U.S. Appl. No. 11/158,724 Office Action Mailed Sep. 26, 2012.
U.S. Appl. No. 11/158,724 Office Action Mailed Sep. 8, 2008.
U.S. Appl. No. 11/158,724 Office Action Mailed Jun. 25, 2014.
U.S. Appl. No. 11/877,591 Final Office Action Mailed Nov. 4, 2013.
U.S. Appl. No. 11/877,591 Office Action Mailed Feb. 29, 2012.
U.S. Appl. No. 11/877,591 Office Action Mailed Jul. 1, 2013.
U.S. Appl. No. 11/877,591 Office Action Mailed Sep. 21, 2012.
U.S. Appl. No. 11/877,591 Office Action Mailed May 7, 2014.
U.S. Appl. No. 11/995,685 Office Action Mailed Aug. 20, 2010.
U.S. Appl. No. 11/995,685 Office Action Mailed Nov. 24, 2009.
U.S. Appl. No. 11/995,687 Office Action Mailed Apr. 6, 2012.
U.S. Appl. No. 11/995,687 Office Action Mailed Sep. 28, 2011.
U.S. Appl. No. 12/298,459 Office Action Mailed Apr. 6, 2012.
U.S. Appl. No. 12/298,459 Office Action Mailed Aug. 10, 2011.
U.S. Appl. No. 12/298,459 Office Action Mailed May 31, 2013.
U.S. Appl. No. 12/426,198 Office Action Mailed Feb. 6, 2012.
U.S. Appl. No. 12/426,198 Office Action Mailed Feb. 7, 2014.
U.S. Appl. No. 12/426,198 Office Action Mailed Mar. 23, 2011.
U.S. Appl. No. 12/443,959 Office Action Mailed Dec. 13, 2012.
U.S. Appl. No. 12/443,959 Office Action Mailed Feb. 15, 2012.
U.S. Appl. No. 12/504,597 Final Office Action Mailed Oct. 3, 2012.
U.S. Appl. No. 12/504,597 Office Action Mailed Apr. 1, 2014.
U.S. Appl. No. 12/504,597 Office Action Mailed Dec. 5, 2011.
U.S. Appl. No. 12/522,379 Office Action Mailed Apr. 8, 2014.
U.S. Appl. No. 12/522,379 Final Office Action Mailed Aug. 28, 2013.
U.S. Appl. No. 12/522,379 Office Action Mailed Dec. 26, 2012.
U.S. Appl. No. 12/595,848 Office Action Mailed Jan. 13, 2012.
U.S. Appl. No. 12/595,848 Office Action Mailed Mar. 15, 2013.
U.S. Appl. No. 12/595,848 Office Action Mailed Oct. 22, 2013.
U.S. Appl. No. 12/595,848 Office Action Mailed Jun. 3, 2014.
U.S. Appl. No. 12/601,101 Office Action Mailed Dec. 27, 2012.
U.S. Appl. No. 12/601,101 Office Action Mailed Feb. 13, 2014.
U.S. Appl. No. 12/601,101 Office Action Mailed Mar. 27, 2012.
U.S. Appl. No. 12/601,101 Office Action Mailed May 22, 2013.
U.S. Appl. No. 12/648,106 Final Office Action Mailed Sep. 25, 2012.
U.S. Appl. No. 12/648,106 Office Action Mailed Jan. 30, 2012.
U.S. Appl. No. 12/648,106 Office Action Mailed Sep. 18, 2013.
U.S. Appl. No. 12/729,156 Final Office Action Mailed Oct. 16, 2012.
U.S. Appl. No. 12/729,156 Office Action Mailed Feb. 1, 2012.
U.S. Appl. No. 12/729,156 Office Action Mailed Feb. 13, 2014.
U.S. Appl. No. 12/729,156 Office action Mailed May 8, 2013.
U.S. Appl. No. 12/729,580 Final Office Action Mailed Nov. 14, 2013.
U.S. Appl. No. 12/729,580 Office Action Mailed Apr. 10, 2012.
U.S. Appl. No. 12/729,580 Office Action Mailed Jan. 22, 2013.
U.S. Appl. No. 12/729,580 Office Action Mailed Sep. 10, 2014.
U.S. Appl. No. 12/729,603 Final Office Action Mailed Oct. 10, 2012.
U.S. Appl. No. 12/729,603 Office Action Mailed Mar. 27, 2012.
U.S. Appl. No. 12/729,603 Office Action Mailed Jun. 25, 2014.
U.S. Appl. No. 12/738,411 Final Office Action Mailed Apr. 11, 2013.
U.S. Appl. No. 12/738,411 Office Action Mailed Aug. 21, 2013.
U.S. Appl. No. 12/738,411 Office Action Mailed Feb. 6, 2014.
U.S. Appl. No. 12/738,411 Office Action Mailed May 30, 2014.
U.S. Appl. No. 12/748,134 Office Action Mailed Jul. 18, 2013.
U.S. Appl. No. 12/751,902 Office Action Mailed Dec. 19, 2013.
U.S. Appl. No. 12/751,902 Office Action Mailed Jul. 13, 2012.
U.S. Appl. No. 12/762,007 Final Office Action Mailed Oct. 22, 2013.
U.S. Appl. No. 12/762,007 Final Office Action Mailed Apr. 30, 2014.
U.S. Appl. No. 12/762,007 Office Action Mailed Feb. 11, 2013.
U.S. Appl. No. 13/014,632 Office Action Mailed Jan. 10, 2014.
U.S. Appl. No. 13/014,632 Office Action Mailed May 8, 2013.
U.S. Appl. No. 13/086,335 Office Action Mailed May 22, 2013.
U.S. Appl. No. 13/086,335 Office Action Mailed Apr. 4, 2014.
U.S. Appl. No. 13/229,473 Office Action Mailed Jun. 17, 2013.
U.S. Appl. No. 13/340,472 Office Action Mailed Apr. 26, 2013.
U.S. Appl. No. 13/340,472 Office Action Mailed Jan. 15, 2014.
U.S. Appl. No. 13/340,472 Office Action Mailed Aug. 29, 2014.
U.S. Appl. No. 13/384,216 Final Action Mailed Nov. 6, 2013.
U.S. Appl. No. 13/384,216 Office Action Mailed Apr. 24, 2013.
U.S. Appl. No. 13/605,904 Office Action Mailed Jun. 28, 2013.
U.S. Appl. No. 13/605,904 Office Action Mailed Nov. 27, 2012.
U.S. Appl. No. 13/445,723 Office Action Mailed Mar. 14, 2014.
U.S. Appl. No. 13/090,525 Office Action Mailed Apr. 11, 2014.
U.S. Appl. No. 11/995,685 Office Action Mailed Jun. 18, 2014.
Unger et al., “Poly(ethylene carbonate): A thermoelastic and biodegradable biomaterial for drug eluting stent coatings?” Journal of Controlled Release, vol. 117, Issue 3, 312-321 (2007).
Verma et al., “Effect of surface properties on nanoparticle-cell interactions,” Small 6(1):12-21 (2010).
Wagenlehner et al., “A pollen extract (Cernilton) in patients with inflammatory chronic prostatitis/chronic pelvic pain syndrome: a multicentre, randomized, prospective, double-blind, placebo-controlled phase 3 study,” Eur Urol 9 (Epub) (Jun. 3, 2009).
Wang et al. Controlled release of sirolimus from a multilayered PLGA stent matrix. Biomaterials 27:5588-95 (2000).
Wang et al., “Treatment with melagatran alone or in combination with thrombolytic therapy reduced ischemic brain injury,” Exp. Neurol 213(1):171-175 (2008).
Warner et al., “Mitomycin C and airway surgery: how well does it work?” Ontolaryngol Head Neck Surg. 138(6):700-709 (2008).
Wermuth, CG Similarity in drugs: reflections on analogue design. Drug Discov Today. 11(7-8):348-54. (2006).
Witjes et al., “Intravesical pharmacotherapy for non-muscle-invasive bladder cancer: a critical analysis of currently available drugs, treatment schedules, and long-term results,” Eur. Urol. 53(1):45-52 (2008).
Wu et al., “Study on the preparation and characterization of biodegradable polylactide/multi-walled carbon nanotubes nanocomposites.” Polymer 48: 4449-4458 (2007).
Xu et al., “Biodegradation of poly(l-lactide-co-glycolide tube stents in bile” Polymer Degradation and Stability. 93:811-817 (2008).
Xue et al., “Spray-as-you-go airway topical anesthesia in patients with a difficult airway: a randomized, double-blind comparison of 2% and 4% lidocaine,” Anesth. Analg. 108(2): 536-543 (2009).
Yepes et al., “Tissue-type plasminogen activator in the ischemic brain: more than a thrombolytic,” Trends Neurosci. 32(1):48-55 (2009).
Yousof et al., “Reveratrol exerts its neuroprotective effect by modulating mitochondrial dysfunction and associated cell death during cerebral ischemia,” Brain Res. 1250:242-253 (2009).
Zhou et al. Synthesis and Characterization of Biodegradable Low Molecular Weight Aliphatic Polyesters and Their Use in Protein-Delivery Systems. J Appl Polym Sci 91:1848-56 (2004).
Zilberman et al., Drug-Eluting bioresorbable stents for various applications, Annu Rev Biomed Eng., 8:158-180 (2006).
The Properties of Gases and Liquids, 5th ed., McGraw-Hill, Chapter 9, pp. 9.1-9.51, 2001.
Akoh et al., “One-Stage Synthesis of Raffinose Fatty Acid Polyesters.”Journal Food Science (1987) 52:1570.
Albert et al., “Antibiotics for preventing recurrent urinary tract infection in nonpregnant women,”Cochrane Database System Rev. 3, CD001209 (2004).
Au et al., “Methods to improve efficacy of intravesical mitomycin C: Results of a randomized phase III trial,” Journal of the National Cancer Institute, 93 (8 ), 597-604 (2001).
Bugay et al., “Raman Analysis of Pharmaceuticals,” in “Applications of Vibrational Spectroscopy in Pharmaceutical Research and Development,” Edited by Pivonka, D.E., Chalmers, J.M., Griffiths, P.R. (2007) Wiley and Sons.
Charging of Materials and Transport of Charged Particles (Wiley Encyclopedia of Electrical and Electronics Engineering, John G. Webster (Editor), vol. 7, 1999, John Wiley & Sons, Inc., pp. 20-24).
Klein et al., Viscosities of pure gases can vary by as much as a factor of 5 depending upon the gas type, Int. J. Refrigeration 20: 208-217, 1997.
PCT/US07/82775 International Preliminary Report on Patentablity dated May 5, 2009.
PCT/US11/44263 International Preliminary Report on Patentability dated Jan. 22, 2013.
Related Publications (1)
Number Date Country
20150040827 A1 Feb 2015 US
Divisions (1)
Number Date Country
Parent 12748134 Mar 2010 US
Child 14310960 US