Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
  • A61L29/08—Materials for coatings
  • A61L29/085—Macromolecular materials
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M25/00—Catheters; Hollow probes
  • A61M25/10—Balloon catheters
  • A61M25/1027—Making of balloon catheters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/36—Hydroxylated esters of higher fatty acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/48—Polyethers
  • C08G18/4804—Two or more polyethers of different physical or chemical nature
  • C08G18/482—Mixtures of polyethers containing at least one polyether containing nitrogen
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/48—Polyethers
  • C08G18/4833—Polyethers containing oxyethylene units
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/48—Polyethers
  • C08G18/50—Polyethers having heteroatoms other than oxygen
  • C08G18/5021—Polyethers having heteroatoms other than oxygen having nitrogen
  • C08G18/5024—Polyethers having heteroatoms other than oxygen having nitrogen containing primary and/or secondary amino groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
  • C08G18/6696—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/80—Masked polyisocyanates
  • C08G18/8003—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen
  • C08G18/8006—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen with compounds of C08G18/32
  • C08G18/8009—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen with compounds of C08G18/32 with compounds of C08G18/3203
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/04—Polyurethanes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2400/00—Materials characterised by their function or physical properties
  • A61L2400/10—Materials for lubricating medical devices
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2420/00—Materials or methods for coatings medical devices
  • A61L2420/02—Methods for coating medical devices
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2420/00—Materials or methods for coatings medical devices
  • A61L2420/06—Coatings containing a mixture of two or more compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2420/00—Materials or methods for coatings medical devices
  • A61L2420/08—Coatings comprising two or more layers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M25/00—Catheters; Hollow probes
  • A61M25/0043—Catheters; Hollow probes characterised by structural features
  • A61M25/0045—Catheters; Hollow probes characterised by structural features multi-layered, e.g. coated
  • A61M2025/0046—Coatings for improving slidability
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M25/00—Catheters; Hollow probes
  • A61M25/10—Balloon catheters
  • A61M25/1027—Making of balloon catheters
  • A61M25/1029—Production methods of the balloon members, e.g. blow-moulding, extruding, deposition or by wrapping a plurality of layers of balloon material around a mandril
  • A61M2025/1031—Surface processing of balloon members, e.g. coating or deposition; Mounting additional parts onto the balloon member's surface
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M25/00—Catheters; Hollow probes
  • A61M25/10—Balloon catheters
  • A61M2025/1043—Balloon catheters with special features or adapted for special applications
  • A61M2025/1075—Balloon catheters with special features or adapted for special applications having a balloon composed of several layers, e.g. by coating or embedding
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M25/00—Catheters; Hollow probes
  • A61M25/10—Balloon catheters
  • A61M2025/1043—Balloon catheters with special features or adapted for special applications
  • A61M2025/1088—Balloon catheters with special features or adapted for special applications having special surface characteristics depending on material properties or added substances, e.g. for reducing friction
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G2210/00—Compositions for preparing hydrogels
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
  • Y10T428/31554—Next to second layer of polyamidoester
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
  • Y10T428/31573—Next to addition polymer of ethylenically unsaturated monomer
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers
  • Y10T428/31909—Next to second addition polymer from unsaturated monomers

Definitions

• the present invention relates to hydrophilic, lubricious coatings for substrates. Particularly, it relates to hydrophilic, lubricious coating compositions including a first, lubricious base layer and a second, lubricious top layer. Methods for applying such hydrophilic, lubricious coatings, and medical devices so coated, are provided. Exemplary devices which may be coated with the hydrophilic, lubricious coatings of the present invention include catheters, balloon catheters, and the like.
• an outer portion of the medical device may be fabricated of a material having desirable low-friction properties such as TEFLON or other such materials.
• desirable low-friction properties such as TEFLON or other such materials.
• hydrophilic, lubricious coatings are known for medical devices to provide the desired anti-friction properties.
• One such coating may be formed from combinations of isocyanate, polyurethane, and polyvinylpyrrolidone (PVP).
• PVP polyvinylpyrrolidone
• Other such coatings have been provided with combination of isocyanate and/or polyurethane in with poly(ethylene oxide) (PEO).
• PEO poly(ethylene oxide)
• PEO poly(ethylene oxide)
• isocyanate, polyols or polyamines, and PVP or PEO are known to provide the desired low-friction properties for medical device surfaces.
• PVP and PEO-based coatings are disclosed in U.S. Patent Nos. 5,160,790 and 5,179,174 to Elton.
• polyvinylpyrrolidone-based coatings while suitably flexible and lubricious, may abrade during use, exposing portions of the coated medical device and reducing the overall anti-friction properties of the coated device.
• Poly(ethylene oxide)-based coatings while providing superior abrasion resistance, are not as soft and generally not as lubricious as polyvinylpyrrolidone-based coatings.
• hydrophilic, lubricious coatings for medical devices which, while providing the desired anti-friction properties, retain those anti-friction properties even in the event a portion of the coatings abrade during use.
• hydrophilic, lubricious coatings including a first layer comprising PEO and a second layer comprising PVP are disclosed. In the event the second, PVP-based layer abrades, the coated device retains its anti-friction properties due to the more durable, PEO-based first layer.
• hydrophilic, lubricious coatings to an exterior surface of a medical device such as a catheter, a balloon catheter, or other such device, and compositions of such coatings.
• a medical device such as a catheter, a balloon catheter, or other such device
• compositions of such coatings comprising a first, poly(ethylene oxide)-based layer and a second, polyvinylpyrrolidone-based layer. Still further, methods for applying such coatings are described.
• a hydrophilic, lubricious coating for a substrate which includes a first, abrasion-resistant layer having a cross- linked polyurethane/poly(ethylene oxide) component formed by reacting a mixture of an isocyanate, a polyol or polyamine, and a poly(ethylene oxide).
• the lubricious coating further includes a second layer having a cross-linked polyurethane/ polyvinylpyrrolidone component formed by reacting a mixture of an isocyanate, a polyol or polyamine, and a polyvinylpyrrolidone.
• the first layer may be substantially covered by the second layer, and the second layer may at least partially interpenetrate the first layer.
• a method for providing a hydrophilic, lubricious coating on an exterior surface of a substrate includes the steps of applying a first, abrasion-resistant layer comprising a mixture of an isocyanate, a polyol, and a poly(ethylene oxide) and curing the first, abrasion-resistant layer to provide a cross-linked polyurethane/poly(ethylene oxide) coating.
• a second layer comprising a mixture of an isocyanate, a polyol, and a polyvinylpyrrolidone and curing the second layer to provide a cross-linked polyurethane/polyvinylpyrrolidone coating.
• Application of the first and second layers according to the present disclosure may be by any one of dipping, spraying, brushing, rolling, or wiping.
• the recited curing steps may be accomplished by baking the coated substrate at temperature.
• Suitable substrates for coating according to the present methods include medical devices such as catheters, balloon catheters, urinary catheters, catheter introducers, medical wires, stents, stent grafts, dilation balloons, and the like.
• Figure 1 is a cross-sectional view of a portion of a balloon catheter, including a shaft and balloon coated with a flexible, hydrophilic and lubricious coating according to the invention.
• Figure 2 shows a portion of the coated balloon catheter Figure 1, showing a portion of a second coating layer abraded.
• hydrophilic, lubricious coatings for medical devices, and devices so coated, are provided.
• the coatings include two hydrophilic, lubricious layers.
• the first lubricious layer is disposed adjacent the medical device surface, and includes at least an isocyanate/polyol component or an isocyanate/polyamine component, and a poly(ethylene oxide) component.
• the second layer which may substantially overlay the first layer, includes at least an isocyanate/polyol component or an isocyanate/polyamine component, and a polyvinylpyrrolidone component.
• the coatings may be applied to a variety of medical devices formed of known substrates by conventional coating application methods.
• Devices which may be coated with the coatings described herein include without limitation catheters, balloon catheters (including the balloon catheter shaft, balloon, or both), introducers, body implants, medical wires, stents, stent grafts, tubing, dilation balloons, and the like.
• Such devices may be fabricated of any suitable material as is known in the art for such purposes.
• substrate materials will be selected which provide functional groups, including carboxylic acids, -OH groups, -NH groups, -SH groups, or the like, which react suitably with the isocyanate component of the present coatings.
• the present coatings may also be applied to devices providing a metal surface.
• a primer layer will be applied to such metal substrates prior to application of the present coatings, to enhance bonding of the first lubricious layer with the metal substrate.
• Such primers are disclosed in U.S. Patent No. 6,270,902, and may include a number of compositions for providing the desired functional groups for reaction with the isocyanate component of the first coating layer. Examples include without limitation ethyl vinyl alcohol, isocyanate- terminated prepolymers, polyurethane, epoxies, and NCO and OH-functional silanes.
• plastics and other polymers such as nylon, polyether block amide, polyethylene terephthalate, polyetherurethane, polyesterurethane, other polyurethanes, natural rubber, rubber latex, synthetic rubbers, polyester-polyether copolymers, polycarbonates, and other organic materials.
• plastics and other polymers such as nylon, polyether block amide, polyethylene terephthalate, polyetherurethane, polyesterurethane, other polyurethanes, natural rubber, rubber latex, synthetic rubbers, polyester-polyether copolymers, polycarbonates, and other organic materials.
• PEBAX available from Arkema, Inc. of Philadelphia,
• a highly lubricious coating is formed overlying a substrate, in the depicted embodiments (see Figures 1 and 2) being a balloon catheter including a shaft 10 defining a hollow lumen 12 and a balloon 18 concentrically arranged about a distal end of the shaft 10.
• the coating is formed of two hydrophilic, lubricious coating layers 14, 16 formed of flexible organic polymeric materials.
• the coatings may be applied by a variety of methods, including dipping, spraying, wiping, painting, rolling, brushing, and the like. For convenience, the coatings will typically be applied by dipping a medical device in a solution containing the desired coating material.
• the coating comprises at least a mixture of isocyanate, a polyol or polyamine, and a poly(ethylene oxide).
• a ratio of weight of polyurethane or polyurea solids (from the combination of isocyanate and polyol or polyamine): poly(ethylene oxide) may be selected to be from about 0.25 to about 6.0.
• the weight ratio will typically be from about 0.7 to about 5.0 according to the particular isocyanate and polyol or polyamine selected for the first coating layer 14.
• the stoichiometric ratio of total NCO groups in the isocyanate to total -OH groups in the polyol (or -NH groups, if a polyamine is used) for the first coating layer 14 can vary from about 0.6 to about 3.5.
• an NCO to -OH or -NH ratio close to 1.0.
• a ratio of from about 1.05 to about 1.3 NCO:OH will be selected to provide a slight excess of isocyanate, providing for suitable bonding of the first coating layer 14 to the substrate via interactions between the free isocyanate groups of the coating layer 14 mixture and the functional groups present in the underlying substrate.
• the particular NCO: OH ratio selected will vary in accordance with the substrate of choice, the properties of the specific polyols or polyamines used, and the desired properties of the final coating.
• an NCO:OH ratio of 1.1 :1 is typically selected.
• Isocyanates having at least two unreacted isocyanate groups per molecule are suitable, including without limitation polymethylenepolyphenyl isocyanate, 4,4'- diphenylmethane diisocyanate and position isomers thereof, 2,4-toluene diisocyanate and position isomers thereof, 3,4-dichlorophenyl diisocyanate and isophorone isocyanate, adducts or prepolymers of isocyanates and polyols such as the adduct of trimethylolpropane and diphenylmethane diisocyanate or toluene diisocyanate.
• polyisocyanates useful in this invention may be found in the ICI Polyurethanes Book, George Woods, published by John Wiley and Sons, New York, N.Y. (1987) and the Encyclopedia of Polymer Science and Technology, H. F. Mark, N. G. Gaylord and N. M. Bikales (eds.), (1969), the disclosures of each of which are incorporated herein in their entirety by reference.
• a preferred isocyanate for use in the present invention provides about 11.9% NCO, available in one embodiment from Bayer as Desmodur L 67 MPA/X.
• Suitable polyols may be any of a large number of polyols reactive with the isocyanates to form polyurethanes as is known in the art.
• suitable polyols include without limitation polyester polyols, polyether polyols, modified polyether polyols, polyester ether polyols, castor oil polyols and polyacrylate polyols.
• Specific polyols further include castor oil and castor oil derivatives (triglyceride of 12-hydroxyoleic acid), poly (ethylene adipates), poly (diethyleneglycol adipates, polycaprolactone diols and polycaprolactone-polyadipate copolymer diols, poly (ethyleneterephthalate) polyols, polycarbonate diols, ⁇ , ⁇ , ⁇ ', ⁇ '- tetrakis (a hydroxypropyl) ethylenediamine, polytetramethylene ether glycol, ethyleneoxide adducts of polyisopropylene diols, ethylene oxide adducts of polyisopropylene triols.
• castor oil and castor oil derivatives triglyceride of 12-hydroxyoleic acid
• poly (ethylene adipates) poly (diethyleneglycol adipates, polycaprolactone diols and polycaprolactone-polyadipate copo
• Particular example polyols include DESMOPHEN 1800, DESMOPHEN A365, DESMOPHEN 651A-65, DESMOPHEN 1300 75, DESMOPHEN 800, DESMOPHEN A160, DESMOPHEN 550 DU, DESMOPHEN 1600U, DESMOPHEN 1920D, and DESMOPHEN 1 150 all available from Bayer Corporation of Pittsburgh, PA.
• Other suitable polyols include castor oil (triglyceride of 12-hydroxy oleic acid) and castor oil derivatives, such as DB oil, POLYCIN 12, POLYCIN 53 and POLYCIN 99F all available from Vertellus, Inc. of Bayonne, N.J.
• Suitable diols include poly(ethylene adipates), poly (diethyleneglycol adipates), polycaprolactone diols and polycaprolactone-polyadipate copolymer diols, poly (ethyleneterephthalate) polyols, polycarbonate diols, polytetramethylene ether glycol, ethylene oxide adducts of polyoxypropylene diols, ethylene oxide adducts of polyoxypropylene triols. Many other suitable polyols are available as known to those skilled in this art. [0025] Suitable polyamine products may be selected from any of a large number of polyamines reactive with isocyanate to form polyureas as is known in the art.
• Non-limiting examples of suitable polyamine products include Jeffamine D-230, Jeffamine D-400, Jeffamine D-2000, Jeffamine T-403, Jeffamine T-5000, and Jeffamine T-3000 available from Huntsman Corporation of The Woodlands, TX. Melamine and melamine derivatives may also be used, available from many chemical supply companies. Heterocyclic diamines and amine adducts may also be used. Additional suitable polyamines are available as known to those skilled in the art.
• the solvents selected for the invention used are preferably those that do not react with the isocyanate, the polyol or the poly(ethylene oxide) but are solvents for all.
• the solvents preferably are free of reactive amine, hydroxyl and carboxyl groups.
• the solvent should further preferably be capable of dissolving the isocyanate, polyol, and poly(ethylene oxide).
• Suitable solvents include but are not limited to methylene bromide, methylene chloride, chloroform, dichloroethane, acetonitrile, methyl benxoate, benzyl acetate, n-propyl bromide, cyclohexanone, dichloethylene, 1 ,3-dioxolane and N-methyl pyrrolidone.
• Other solvents meeting the above objectives are also suitable.
• a solids contents for the first coating layer 14 mixture in a range of from about
• the solids content of the coating solution may be 1 to 15% (w/w) and preferably 2.25 to 4% (w/w).
• the solids content of the coating solution may be 0.4 to 10% (w/w) and preferably 1.2 to 2.5%> (w/w).
• the solids content of the first coating layer 14 solution will vary according to a number of factors.
• the poly(ethylene oxide) selected will typically be from the group having an average molecular weight of from about 80,000 to about 5,000,000.
• a poly(ethylene oxide) will be selected from the group having an average molecular weight of from about 200,000 to about 600,000, since use of poly(ethylene oxide)s having an average molecular weight in excess of 600,000 may create problems with viscosity of the resultant mixture.
• Poly(ethylene) oxide products are typically characterized using viscosity average molecular weight (M v ), which is generally closer to weight average molecular weight (M w ) than number average molecular weight (M n ).
• Viscosity average molecular weight is usually determined by viscometry methods whereby the viscosity is measured on solutions of the polymer at various concentrations.
• Commercially available poly(ethylene oxide) products include ALKOX R-150, ALKOX R-400, ALKOX E-45, ALKOX E-75, ALKOX E-240 all from Meisei Chemical Works, Ltd of Kyoto, Japan, and P-20 Grade Poly(ethylene oxide) available from Ring Specialty Chemicals, of Toronto, Ontario, Canada.
• the first coating layer 14 mixture may be provided as a solution.
• the first coating layer 14 mixture in solution form is prepared by weighing the appropriate quantities of isocyanate, polyol or polyamine, poly(ethylene oxide), and solvent stock solutions into an appropriate mixing vessel. Additional solvents may be added to adjust the viscosity as needed.
• This solution is mixed well and may then be applied to an appropriate medical device, such as by dipping, spraying, wiping, painting, rolling, and the like.
• a medical device such as a catheter, balloon catheter, and the like will be dipped into the coating layer 14 mixture by dipping for a period sufficient to wet the device.
• the solvent may be allowed to evaporate from the coated substrate 10 such as by exposure to ambient conditions for from 10 to 180 minutes, but can be evaporated at temperatures of from 35 0 F to 400 0 F for time periods of a few seconds to overnight, depending upon the selection of solvent and the speed with which evaporation is desired.
• the device may be hung from a proximal end thereof whereby the liquid coating solution is drawn by gravity towards the distal tip of the device.
• the time frame for evaporation will typically be kept short to allow suitable solvent evaporation without significant reaction of atmospheric moisture with the isocyanate component of the first coating layer 14 mixture.
• the first coating layer 14 is then cured. Suitable cure times/temperatures will vary with the choice of isocyanate and polyol and the composition of the substrate.
• a device such as a balloon catheter having a balloon which is typically more temperature sensitive, than, for example, the catheter shaft, will typically be cured at lower temperatures for a longer time period.
• the first coating layer 14 may be cured by oven baking at about 165 0 F for about 4 hours. For a less temperature sensitive substrate, baking at higher temperatures such as about 250 0 F for a few minutes may suffice.
• a second coating layer 16 is formed from a mixture containing an isocyanate, a polyol or polyamine, and polyvinylpyrrolidone.
• the second coating layer 16 mixture is typically provided as a solution, such as in a carrier liquid.
• the ratio of weight of the polyurethane formed in situ to the polyvinylpyrrolidone may vary from 0.05 to 3.0 and is preferably from 0.30 to 1.0. In order to provide a hydrogel having the desired lubriciousness, the ratio of polyurethane: polyvinylpyrrolidone will typically be kept at 1.0 or less.
• the stoichiometric ratio of total NCO groups in the isocyanate to total OH groups in the polyol (or to total -NH groups in the polyamine) can vary from 0.75 to 3.0.
• an NCO to -OH or -NH ratio close to 1.0.
• typically the ratio is adjusted to somewhat greater than 1.0 since it is known that isocyanates readily react with water, and that incidental quantities of water can integrate with the uncured coating. This water is present from various sources such as atmospheric moisture, moisture in solvent, or moisture associated with the polyvinylpyrrolidone.
• a typical NCO:OH ratio for the second coating layer 16 mixture will be 1.3: 1.
• Polyvinylpyrrolidones suitable for use in the present coatings have an average molecular weight of from about 50,000 to 2.5 million. Polyvinylpyrrolidone products are usually characterized by weight average molecular weight (M w ). Weight average molecular weight may be measured using several different methods, including the most commonly employed methods of size exclusion chromatography (SEC) and gel permeation chromatograph (GPC). Examples of suitable polyvinylpyrrolidone materials include those available from BASF Corp, Parsippany, N.J. as KOLLIDON 90 F, and KOLLIDON 30, and those available from GAF Corporation, as PLASDONE -90, PLASDONE K-30, and PLASDONE K-25.
• SEC size exclusion chromatography
• GPC gel permeation chromatograph
• polyvinylpyrrolidone products typically contain approximately 3-5% (w/w) water. Furthermore, polyvinylpyrrolidone is very hygroscopic, and tends to accumulate water on normal storage when exposed to air. Since water is very reactive toward isocyanates, it is desirable, but not essential, to reduce the water content to less than 0.5% prior to use in preparing coating formulations. This may be readily accomplished by drying an appropriate quantity of polyvinylpyrrolidone, for example, by heating it for several hours at 220
• the isocyanate used will typically be selected from the group of isocyanates as described above, that is, isocyanates having at least two unreacted isocyanate groups per molecule.
• Polyols useful in this invention can be any of a large number of polyols reactive with the isocyanates to form polyurethanes as described above.
• a different polyol or polyols will be selected for the second coating layer 16 mixture, although it is contemplated to use the same polyol or polyols as for the first coating layer 14 mixture.
• Suitable solvents will not react with the isocyanate, the polyol or the polyvinylpyrrolidone, but are solvents for all.
• the solvents must be free of reactive groups such as, for example, amine, hydroxyl and carboxyl groups.
• the solvent must further be capable of dissolving the isocyanate, polyol, and polyvinylpyrrolidone.
• the coating solution should also be substantially free of water which may react with the isocyanate groups.
• the solvent be very dry, that is, that the water content of the solvent used be very low, (e.g., less than 100 ppm).
• Suitable solvents available commercially in a suitably dry form include but are not limited to methylene bromide, methylene chloride, chloroform, dichloroethane, acetonitrile, n-propyl bromide, 1 ,3-dioxolane, N-methyl pyrrolidone and dichloroethylene.
• methylene chloride the solids content of the coating solution may be 1 to 15% (w/w) and preferably 2.25 to 4% (w/w).
• dibromomethane the solids content of the coating solution may be 0.4 to 10% (w/w) and preferably 1.2 to 2.5% (w/w).
• the solids content of the second coating layer 16 solution will vary according to the solvent of choice, the desired thickness of the coating, the viscosity properties of the particular grade of polyvinylpyrrolidone selected, and other factors.
• Other solvents meeting the above objectives are also suitable.
• the second coating layer 16 mixture may be prepared by weighing the appropriate quantities of isocyanate, polyol or polyamine, polyvinylpyrrolidone, and solvent stock solution and adding them into an appropriate mix vessel. Additional solvents can be added to adjust the viscosity and solids content. Solids contents may be in a range of from 0.4 to 15% (w/w), with 1.5 to 4% (w/w) preferred, depending on the solvent used and other considerations. This solution is mixed well and then applied to a desired substrate such as a catheter or a balloon catheter.
• the solvent may be allowed to evaporate, such as by exposure to ambient conditions for a suitable time period. In one embodiment, the solvent is allowed to evaporate for a period of from 15 to 180 minutes. It is preferable to accomplish this evaporation in such a manner as to minimize the accumulation of water in the uncured coating film resulting from hygroscopic attraction of atmospheric moisture to the polyvinylpyrrolidone. This can be accomplished readily by minimizing the evaporation time, reducing the ambient humidity, elevating the ambient temperature for drying, or using a combination of these methods. As discussed above, the device may be hung from a proximal end, such as a proximal end (not shown) of a balloon catheter as shown in Figure 1, whereby the second coating layer 16 solution is drawn by gravity towards the distal tip of the device.
• a proximal end such as a proximal end (not shown) of a balloon catheter as shown in Figure 1, whereby the second coating layer 16 solution is drawn by gravity towards the distal tip of the device.
• the second coating layer 16 is then cured, substantially according to the procedure set forth above for the first coating layer 14. Without being held to any particular theory, it is believed that this step of curing the second coating layer 16, in addition to providing a desirable cross-linking reaction, provides a degree of interpenetration of the polyvinylpyrrolidone-rich second coating layer 16 into the poly(ethylene oxide)-rich first coating layer 14.
• the cure time and temperature may vary with the choice of isocyanate and polyol and the composition of the substrate 10.
• the balloon associated with a balloon catheter is typically more fragile than the catheter shaft, and will require a longer curing time at a lower temperature.
• Cure temperatures may range from 35 ° F to 350 ° F although a temperature of from about 180 0 F to about 250 0 F may be desirable to prevent moisture absorption by the second coating layer 16 during the curing operation.
• Cure times may vary from 2 minutes to 72 hours or longer, according to the reactivity of the isocyanate and polyol and the selected cure temperature. A caveat is that the cure conditions (time, temperature, etc.) will be maintained to be non-deleterious to the underlying first coating layer 14 and the substrate.
• the second coating layer 16 may be rinsed or soaked, for example in water, to remove any uncomplexed polyvinylpyrrolidone which may remain. Generally a brief rinse of 10-15 seconds is sufficient, however a longer rinse or soak is acceptable since the coating is cured and forms a stable gel when in contact with water. After the rinse, the coating may be dried either at ambient temperature or at elevated temperatures.
• first and second coating layer mixtures may be included in the first and second coating layer mixtures as needed, in accordance with desired reaction conditions to be achieved or desired properties of the finished coating layers.
• Conventional additives include surfactants, viscosity and flow control agents, antioxidants, pigments, air release agents, and catalysts.
• surfactants or wetting agents may be included to promote wetting to the substrate 10 or underlying coating layer, as well as adhesion by the reaction mixture.
• useful wetting agents include without limitation: perfluoroalkyl ethoxylate mixtures, 2,4,7,9 -tetramethyl 1-5 decyn 4,7- diol and ethylene oxide adducts thereof, 3,5 - dimethyl- 1 ,-hexyn 3 ol, condensation products of ethylene oxide and di (isohexyl-isoheptyl) phenol, condensation products of stearylamine and ethylene oxide, nonyl phenoxypoly (ethyleneoxy) ethanol, and polyethoxylated octylphenol.
• Viscosity and flow control agents may be used to adjust the viscosity and thixotropy to a desired level. Desirably, the viscosity of the coating mixtures will be such that the coatings can be formed on the substrate at the desired thickness. Viscosities of from 50 cps to 500 cps can be used although higher or lower viscosities may be desirable in certain instances. Viscosity control agents include but are not limited to fumed silica, cellulose acetate butyrate and ethyl acrylate/ 2-ethyl hexyl acrylate copolymer. Flow control agents, the nature and properties of which are well known to the skilled artisan in this field, may be used in amounts from 0.05 to 5 percent by weight of coating.
• Antioxidants may be used to improve oxidative stability of the cured coatings and include without limitation tris (3,5-di-t-butyl-4-hydroxy benzyl) isocyanurate, 2,2'- methylenebis (4 methyl-6-t-butyl phenol), 1,3,5 Trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, butyl hydroxy toluene, octadecyl 3,5, di-t-butyl 4-hydroxyhydrocinnamate, 4,4'methylenebis (2,6-di-t-butylphenol), ⁇ , ⁇ '-dioctyl diphenylamine, l ,l ,3-tris-(2-methyl-4- hydroxy-5-t-butylphenyl) butane. Antioxidants, when included, may be used in amounts from 0.01 to 1 percent by weight of coating.
• Air release agents include but are not limited to polydimethyl siloxanes, 2,4,7,9-tetramethyl-5-decyn-4 7-diol, 2-ethylhexyl alcohol, n- beta-aminoethyl-gamma-amino-propyl-trimethoxysilane. Air release agents, when included, may be used in amounts from 0.005 to 0.5 percent by weight of coating.
• a catalyst may or may not be used. In all cases polyurethanes or polyureas result.
• Tertiary amine catalysts are suitable for use herein, such as N,N-dimethylaminoethanol, ⁇ , ⁇ -dimethyl cyclo hexylamine Bis-(2-dimethyl aminoethyl) ether, ⁇ , ⁇ , ⁇ ', ⁇ ' ⁇ ''-pentamethyl-diethylene triamine, N-ethylmorpholine, and l-(2-hydroxypropyl) imidizole.
• metallic catalysts include, but are not limited to stannous octoate, dibutyl tin dilaurate, dibutyl tin mercaptide, calcium carbonate, ferric acetylacetonate, lead octoate, and dibutyl tin diricinoleate. Where catalysts are used, amounts are typically in the range of 0.05% to 0.5% by weight of coating. Normal catalytic amounts as are known in the art are preferred.
• a polyurethane/PEO primer coating according to the present invention was prepared by combining the following ingredients into a suitable glass mixing vessel:
• a polyurethane/PVP top coating according to the present invention was prepared by weighing the following ingredients into a suitable glass mixing vessel:
• a catheter containing a inflated PET balloon was first coated in the above mentioned polyurethane/PEO primer coating by immersing the catheter in the coating at a rate of approximately 2 inches/second, followed by withdrawing the catheter at a rate of approximately 0.3 inches/second.
• the catheter was allowed to dry in ambient conditions for approximately 20 minutes, followed by baking at 165 0 F for a period of 4 hours.
• the catheter was then coated with in the above mentioned polyurethane/PVP top coating, using the same dipping and baking conditions.
• a polyurethane/PEO primer coating according to the present invention was prepared by combining the following ingredients into a suitable glass mixing vessel:
• a polyurethane/PVP top coating according to the present invention was prepared by weighing the following ingredients into a suitable glass mixing vessel:
• a catheter containing an inflated PET balloon was first coated in the above mentioned polyurethane/PEO primer coating by immersing the catheter in the coating at a rate of approximately 1 inches/second, followed by withdrawing the catheter at a rate of approximately 0.5 inches/second.
• the catheter was allowed to dry in ambient conditions for approximately 20 minutes, followed by baking at 165 0 F for a period of 1 hour.
• the catheter was then coated with the above mentioned polyurethane/PVP top coating, using the same dipping conditions, followed by a bake cycle of 165 0 F for a period of 4 hours.
• a polyurea/PEO primer coating according to the present invention is prepared by combining the following ingredients into a suitable glass mixing vessel:
• a polyurethane/PVP top coating of the present invention is prepared by weighing the following ingredients into a suitable glass mixing vessel: 5.99 g of a toluene diisocyanate adduct of trimethylolpropane, available as Desmodur L 67 MPA/X; 2.99 g of a castor oil polyol, available as D B Oil; 200 g of a 5% solution of a polyvinylpyrrolidone (dried for 90 minutes at 250 0 F before placing in solution), available as Plasdone 90, in 1,3-dioxolane; and 196 g of 1,3-dioxolane.
• a catheter containing an inflated PET balloon is first coated with the above mentioned polyurea/PEO primer coating by immersing the catheter in the coating at a rate of approximately 1.5 inches/second, followed by withdrawing the catheter at a rate of approximately 0.5 inches/second.
• the catheter is allowed to dry in ambient conditions for approximately 30 minutes, followed by baking at 165 0 F for a period of 4 hours.
• the catheter is then coated with the above mentioned polyurethane/PVP top coating, using the same dipping and baking conditions.
• a polyurethane/PEO primer coating according to the present invention is prepared by combining the following ingredients, into a suitable glass mixing vessel:
• a polyurea/PVP top coating of the present invention is prepared by weighing the following ingredients into a suitable glass mixing vessel:
• a catheter containing an inflated PET balloon is first coated with the above mentioned polyurea/PEO primer coating by immersing the catheter in the coating at a rate of approximately 1.2 inches/second, followed by withdrawing the catheter at a rate of approximately 0.4 inches/second.
• the catheter is allowed to dry in ambient conditions for approximately 20 minutes, followed by baking at 170 0 F for a period of 4 hours.
• the catheter is then coated with the above mentioned polyurethane/PVP top coating, using the same dipping and baking conditions.
• a polyurethane/PEO primer coating according to the present invention is prepared by combining the following ingredients into a suitable glass mixing vessel:
• a polyurethane/PVP top coating of the present invention is prepared by weighing the following ingredients into a suitable glass mixing vessel:
• a polyisocyanate available as Baytec MP-210; 5.31 g of a modified castor oil polyol, available as Polycin 12; 400 g of a 5% solution of a polyvinylpyrrolidone (dried for 4 hours at 205 0 F before placing in solution), available as Plasdone 90, in acetonitrile; and 499 g of 1 ,3- dioxolane. These ingredients are mixed thoroughly to dissolve the components. This yields a coating solution of approximately 4.5% (w/w) concentration, with a NCO/OH ratio of 1.1, and a ratio of polyurethane solids to polyvinylpyrrolidone of 0.6.
• a catheter containing an inflated PET balloon is first coated with the above mentioned polyurea/PEO primer coating by immersing the catheter in the coating at a rate of approximately 1.0 inches/second, followed by withdrawing the catheter at a rate of approximately 0.3 inches/second.
• the catheter is allowed to dry in ambient conditions for approximately 20 minutes, followed by baking at 175 0 F for a period of 3.5 hours.
• the catheter is then coated with the above mentioned polyurethane/PVP top coating, using the same dipping and baking conditions.
• a polyurea/PEO primer coating according to the present invention is prepared by combining the following ingredients into a suitable glass mixing vessel:
• a polyurea/PVP top coating according to the present invention is prepared by weighing the following ingredients into a suitable glass mixing vessel:
• a catheter containing an inflated PET balloon is first coated with the above mentioned polyurea/PEO primer coating by immersing the catheter in the coating at a rate of approximately 2.0 inches/second, followed by withdrawing the catheter at a rate of approximately 0.5 inches/second.
• the catheter is allowed to dry in ambient conditions for approximately 20 minutes, followed by baking at 150 0 F for a period of 8 hours.
• the catheter is then coated with the above mentioned polyurethane/PVP top coating, using the same dipping and baking conditions.
• Example 1 For comparison, a balloon catheter as described in Example 1 was coated in the polyurethane/PVP top coating as described in Example 1, but without first coating with the polyurethane/PEO primer coating. The coating was applied by dipping, and dried and baked as described in Example 1.
• a polyurethane/PVP top coating was prepared substantially as described in
• Example 1 by weighing the following ingredients into a suitable glass mixing vessel:
• a catheter containing an inflated PET balloon was dipped in the polyurethane primer at a rate of approximately 2 inches/second, followed by withdrawing the catheter at a rate of approximately 0.3 inches/second.
• the catheter was allowed to dry in ambient conditions for approximately 20 minutes, followed by baking at 165 0 F for a period of 4 hours.
• the catheter was then coated with in the above mentioned polyurethane/PVP top coating, using the same dipping and baking conditions.
• the coating can imbibe water from an aqueous solution prior to introduction to the body and can become lubricious.
• the coating can imbibe water solely from body fluids, even if not introduced to water prior to introduction into the body. Because the coating is a cross-linked system, it adheres well to the substrate and/or underlying coating even when hydrated. It can be dried and remoistened repeatedly and it will retain its lubricating properties.
• the two-layer coating as described herein provides further advantages over conventional hydrophilic coatings for substrates such as medical devices.
• the first, poly(ethylene oxide)-based coating 14 resists abrasion, and exhibits superior durability.
• the second, polyvinylpyrrolidone-based coating 16 provides a hydrophilic, layer which is more lubricious, but less durable than the first coating. In the event that a portion of the second coating layer becomes worn or abraded (see arrows in Figure 2), the first, more durable coating layer 14 remains and provides a lubricious surface.
• the present coating can be dried and remoistened repeatedly while retaining its lubricating properties.

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