US20130123816A1 - Hydrophilic medical devices - Google Patents
Hydrophilic medical devices Download PDFInfo
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- US20130123816A1 US20130123816A1 US13/293,215 US201113293215A US2013123816A1 US 20130123816 A1 US20130123816 A1 US 20130123816A1 US 201113293215 A US201113293215 A US 201113293215A US 2013123816 A1 US2013123816 A1 US 2013123816A1
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- Prior art keywords
- fibers
- surgical buttress
- making
- absorbent surgical
- glycolide
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- 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
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/072—Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
- A61B17/07292—Reinforcements for staple line, e.g. pledgets
-
- 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
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
- A61L15/26—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof
-
- 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
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/64—Use of materials characterised by their function or physical properties specially adapted to be resorbable inside the body
-
- 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
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/04—Macromolecular materials
- A61L31/06—Macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L31/146—Porous materials, e.g. foams or sponges
-
- 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
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L31/148—Materials at least partially resorbable by the body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/14—Surface shaping of articles, e.g. embossing; Apparatus therefor by plasma treatment
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
- D04H1/565—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres by melt-blowing
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
- D06M10/02—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements ultrasonic or sonic; Corona discharge
- D06M10/025—Corona discharge or low temperature plasma
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00004—(bio)absorbable, (bio)resorbable, resorptive
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00831—Material properties
- A61B2017/00942—Material properties hydrophilic
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F2013/00089—Wound bandages
- A61F2013/00314—Wound bandages with surface treatments
- A61F2013/00323—Wound bandages with surface treatments to make surface hydrophilic
-
- 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
- A61L2400/18—Modification of implant surfaces in order to improve biocompatibility, cell growth, fixation of biomolecules, e.g. plasma treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2310/00—Treatment by energy or chemical effects
- B32B2310/14—Corona, ionisation, electrical discharge, plasma treatment
-
- 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
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
Definitions
- the present disclosure relates to medical devices, and more particularly, to surgical implants having a hydrophilic surface treatment for improved wettability and cellular attachment.
- implants The use of medical devices, and more specifically, implants, is known.
- the implants once placed in situ, may dislocate or migrate and, thus, are frequently secured to tissue during surgery using surgical tacking devices or fasteners, such as staples, clips, tacks, sutures, and the like.
- Porous implants are often utilized for their ability to provide biologic fixation and integration into surrounding tissue.
- the increased surface area of the implant allows for tissue infiltration into the implant via pores.
- the rate of tissue ingrowth is limited, however, and influenced by factors such as the porosity of the implant, depth of the porosity, and length of time of implantation.
- Such an implant would improve surgical site visibility during surgery by wicking away excess fluid, improve pooling of coagulation and growth factors near a wound site, and improve favorable host tissue interactions leading to infiltration and attachment of cell types important to wound healing.
- a method of making an absorbent surgical buttress comprising: generating a plurality of fibers; collecting the plurality of fibers so that they adhere to one another and form a non-woven material; plasma treating at least a portion of a surface of the non-woven material with an ionizable gas species or combination of ionizable gas species configured to chemically modify or functionalize the surface of the non-woven material; and cutting the non-woven material into a desired shape for a surgical buttress.
- the method can include ionizable gas speciess selected from the group consisting of air, water vapor, oxygen, nitrogen, argon, and combinations thereof.
- the fibers are melt extruded.
- the method of making the buttress can include blowing hot air at the fibers as they exit a die head and before they are collected. The hot air blown at the fibers can have a temperature greater than or equal to the melting temperature of the fibers. In certain embodiments, the fibers are collected as they cool.
- the fibers are melt extruded from a polymer selected from the group consisting of lactide homopolymer, glycolide homopolymer, polydioxanone homopolymer, glycolide trimethylene carbonate copolymer, glycolide lactide copolymer, glycolide dioxanone trimethylene carbonate copolymer, and glycolide caprolactone trimethylene carbonate lactide copolymer.
- the fibers are made from a bioabsorbable polymeric material.
- the melting temperature of the polymer may be between about 180 and about 250 degrees celcius. In other embodiments, the melting temperature of the polymer is between about 80 degrees celcius and about 190 degrees celcius.
- the hot air can have a temperature of between about 270 and about 290 degrees celcius.
- the fibers are collected on a conveyor surface.
- the method can include applying heat and pressure to the non-woven material before plasma treating the non-woven material.
- the non-woven material is cut into a shape corresponding to the shape of a linear surgical stapler. In other embodiments, the non-woven material is cut into a shape corresponding to the shape of a circular surgical stapler.
- the fibers can be generated by melt extruding a copolymer of glycolide, caprolactone, trimethylene carbonate and lactide having a melting temperature between about 140 degrees celcius and about 185 degrees celcius.
- the hot air blown at the fibers can have a temperature between about 185 degrees celcius and about 195 degrees celcius.
- the fibers are generated by melt extruding dioxanone having a melting temperature between about 80 degrees celcius and about 125 degrees celcius.
- the air blown at the dioxanone fibers can have a temperature between about 145 degrees celcius and about 155 degrees celcius.
- an absorbent surgical buttress comprises a non-woven material having a plurality of fibers adhered to one another, the fibers being formed from a melt extruded bioabsorbable polymeric material, the non-woven material being plasma treated on at least a portion of a surface of the non-woven material so that the surface is chemically modified or functionalized, the non-woven material being cut into a desired shape for the surgical buttress.
- the fibers are formed from a polymeric material selected from the group consisting of lactide homopolymer, glycolide homopolymer, polydioxanone homopolymer, glycolide trimethylene carbonate copolymer, glycolide lactide copolymer, glycolide dioxanone trimethylene carbonate, and glycolide caprolactone trimethylene carbonate lactide.
- the fibers may be formed from a polymeric material having a melting temperature of between about 180 and 250 degrees celcius. In certain embodiments, the fibers are formed from a polymeric material having a melting temperature of between about 80 degrees celcius and about 190 degrees celcius
- the non-woven material is cut into a shape corresponding to the shape of a linear surgical stapler. In other embodiments, the non-woven material is cut into a shape corresponding to the shape of a circular surgical stapler.
- FIG. 1 is a perspective view of a surgical buttress in accordance with an embodiment of the present disclosure
- FIG. 2 is a schematic illustration of an apparatus which is suitable for carrying out plasma treatment of a substrate in accordance with the present disclosure
- FIGS. 3A-3C are cross-sectional views of the surgical buttress of FIG. 1 , possessing filler materials in accordance with embodiments of the present disclosure;
- FIG. 4 is a graph illustrating a comparison of liquid absorbance of untreated surgical buttresses and plasma treated surgical buttresses formed in accordance with an embodiment of the present disclosure.
- FIG. 5 is a graph illustrating a comparison of the rate of wicking of the plasma treated surgical buttresses of FIG. 4 .
- the present disclosure is directed to medical devices that have been chemically modified to render at least a surface of a substrate of the medical device more hydrophilic than its native state.
- this surface treatment may enable the device to more quickly absorb and/or wick fluids, such as blood, interstitial fluid, cerebral spinal fluid, exudates, etc.
- the medical device will be discussed in terms of a surgical buttress.
- the presently disclosed medical devices may be any surgical implant, such as meshes, scaffolds, grafts (e.g., fabrics and/or tubes), rings, sutures, patches, slings, pledgets, growth matrices, drug delivery devices, wound plugs, and, in general, soft tissue repair devices and surgical prostheses.
- suitable medical devices may be topically applied medical products, such as wound dressings, coverings, gauzes, and the like, that can be used in medical/surgical procedures.
- FIG. 1 illustrates a surgical buttress 10 , an example of a medical device in accordance with the present disclosure, including a porous substrate 12 .
- Porous substrate 12 includes openings 14 , such as pores, voids, or holes over at least a portion of a surface thereof.
- the openings of the buttress of the present disclosure may be sized to permit fibroblast through-growth and ordered collagen laydown, resulting in integration of the buttress into the body.
- the openings may be present as a surface characteristic or a bulk material property, which partially or completely penetrates the substrate, and may be uniformly or randomly distributed across portions thereof.
- the buttress may have an open-cell structure, where the openings are connected to each other, forming an interconnected network. In such embodiments, the openings may be in sufficient number and size so as to interconnect across the entire thickness of the substrate. In some embodiments, the openings do not extend across the entire thickness of the porous substrate, but rather are present at a portion of the surface thereof. Conversely, the buttress may be closed cell, where the openings are not interconnected. Those skilled in the art reading the present disclosure may envision other distribution patterns and configurations of the openings in the porous substrate. It is envisioned that the substrate may, in embodiments, be partially or fully non-porous.
- suitable materials for the porous substrate include, but are not limited to foams (e.g., open or closed cell foams).
- the porous substrate is a foam
- the substrate may be formed using any method suitable to forming a foam or sponge including, but not limited to, lyophilization or freeze-drying of a composition. Suitable techniques for making foams are within the purview of those skilled in the art.
- openings may be formed in filamentous buttresses via the spaces formed between the filaments of the buttress.
- the buttress may be formed from a continuous yarn that is arranged in loops that give rise to the openings in the buttress.
- the size of the openings between the filaments and spacing therebetween may vary depending on the surgical application and desired implant characteristics as envisioned by those skilled in the art.
- the filaments may be made using any technique within the purview of those skilled in the art, such as, for example, extrusion, molding, and/or gel spinning.
- the filaments may be extruded through an extruder unit of a conventional type, such as those disclosed in U.S. Pat. Nos. 6,063,105, 6,203,564, and 6,235,869, the entire disclosures of each of which are incorporated by reference herein.
- filaments may be subsequently brought together into a group to form a yarn.
- a plurality of the filaments may then be braided, twisted, aligned, fused, entangled, intertwined, or otherwise joined or arranged to form a variety of different buttress shapes and sizes.
- the filaments may be drawn, oriented, crinkled, twisted, braided, commingled, or air entangled to form the buttress.
- the filaments may be woven, knitted, interlaced, braided, or formed into a buttress by non-woven techniques.
- the structure of the buttress will vary depending upon the assembling technique utilized to form the device, as well as other factors, such as the type of fibers used, the tension at which the fibers are held, and the mechanical properties required of the buttress.
- knitting may be utilized to form a buttress of the present disclosure. Knitting involves, in embodiments, the intermeshing of filaments, or yarns thereof, to form loops or inter-looping of the filaments.
- filaments may be warp-knitted thereby creating vertical interlocking loop chains and/or may be weft-knitted thereby creating rows of interlocking loop stitches across the buttress.
- weaving may be utilized to form a buttress of the present disclosure. Weaving may include, in embodiments, the intersection of two sets of straight filaments, or yarns thereof, warp and weft, which cross and interweave at right angles to each other, or the interlacing of two filaments at right angles to each other.
- the filaments may be arranged to form a net mesh which has isotropic or near isotropic tensile strength and elasticity.
- a nonwoven material is formed from lactide homopolymer, glyciolide homopolymer, polydioxanone homopolymer, glycolide lactide copolymer, glycolide dioxanone trimethylene carbonate copolymer, glycolide caprolactone trimethylene carbonate lactide copolymer, or glycolide trimethylene carbonate copolymer.
- the polymer resin is melt extruded and the melt pump meters molten polymer into a die head.
- the melt pump speed is between about 2 and about 12 rpm.
- the polymer is forced through the array of holes in the die head, which has holes from about 0.13 mm diameter to about 0.3 mm diameter, in some embodiments, from about 0.175 mm diameter to about 0.25 mm diameter.
- the temperature at the die head is between about 200 degrees celsius and about 275 degrees celsius in some embodiments, from about 235 degrees celsius and about 255 degrees Celsius in some embodiments, and the pressure at the head is between about 10 bar and about 80 bar.
- the polymer fibers exiting the die are forced onto a conveyor belt by blowing hot air.
- the hot air has a temperature of between about 230 degrees celsius and about 325 degrees celsius in some embodiments, and from about 265 degrees celsius and about 295 degrees Celsius in some embodiments.
- the speed of the conveyor belt is between about 1 meter per minute and about 10 meters per minute.
- the fibers randomly land on the conveyor belt and build up to several layers in thickness. Suction is applied through the conveyor belt surface to help compact the fibers against each other as they cool.
- the material may be introduced into calendaring rolls to apply heat and pressure prior to being collected and staged. The material is then annealed to drive out any monomer and advance the crystallization of the polymer. Desirably, the material has a porosity of between about 50% and about 90%.
- the fiber diameters is between about 5 ⁇ m and about 100 ⁇ m.
- the material thickness is between about 150 ⁇ m and about 400 ⁇ m.
- fibers can be generated at lower temperatures.
- fibers are formed from a polymer having a lower melting temperature.
- a copolymer of glycolide, caprolactone, trimethylene carbonate and lactide could be melt extruded at between about 140 degrees celcius and about 185 degrees celcius.
- the hot air blown at the fibers has a temperature between about 185 degrees celcius and about 195 degrees celcius.
- dioxanone is melt extruded at between about 80 degrees celcius and about 125 degrees celcius.
- the hot air blown at the dioxanone fibers has a temperature between about 145 degrees celcius and about 155 degrees celcius.
- the buttress may formed from fibers melt extruded from polymers having a melting temperature of between about 80 degrees celcius and about 190 degrees celcius.
- the filaments may be nonwoven and formed by mechanically, chemically, or thermally bonding the filaments, or yarns thereof, into a sheet or web in a random or systematic arrangement.
- filaments may be mechanically bound by entangling the filaments to form the buttress by means other than knitting or weaving, such as matting, pressing, stitch-bonding, needlepunching, or otherwise interlocking the filaments to form a binderless network.
- the filaments of the buttress may be chemically bound by use of an adhesive such as a hot melt adhesive, or thermally bound by applying a binder such as a powder, paste, or melt, and melting the binder on the sheet or web of filaments.
- the buttress may be spunbound and/or meltblown.
- the diameter of the individual filaments may be from about 5 ⁇ m to about 100 ⁇ m, in embodiments, from about 10 ⁇ m to about 40 ⁇ m in some embodiments, and from about 15 ⁇ m to about 35 ⁇ m in some embodiments, and in some further embodiments, from about 18 ⁇ m to about 33 ⁇ m.
- the finished fabric thickness may be from about 150 ⁇ m to about 400 ⁇ m in embodiments, and from about 150 ⁇ m to about 300 ⁇ m in some embodiments, and from about 200 ⁇ m to about 250 microns in some embodiments, and in some further embodiments about 230 ⁇ m.
- the finished fabric weight may be from about 75 g/m 2 to about 100 g/m 2 , in embodiments, from about 80 g/m 2 to about 95 g/m 2 , and in some embodiments, about 87 g/m 2 . It should be understood that different fabric thicknesses, weights, and porosities may be selected by varying manufacturing conditions.
- the porous substrate may include any biocompatible natural or synthetic material.
- the material may be bioabsorbable or non-bioabsorbable. It should of course be understood that any combination of natural, synthetic, bioabsorbable and non-bioabsorbable materials may be used to form the porous substrate.
- Suitable synthetic biodegradable materials include polymers such as those made from lactide, glycolide, caprolactone, valerolactone, carbonates (e.g., trimethylene carbonate, tetramethylene carbonate, and the like), dioxanones (e.g., 1,4-dioxanone), ⁇ -valerolactone, 1,dioxepanones (e.g., 1,4-dioxepan-2-one and 1,5-dioxepan-2-one), ethylene glycol, ethylene oxide, esteramides, ⁇ -hydroxyvalerate, ⁇ -hydroxypropionate, alpha-hydroxy acid, hydroxybuterates, poly (ortho esters), hydroxy alkanoates, tyrosine carbonates, poly(imide carbonates), poly(imino carbonates) such as poly (bisphenol A-iminocarbonate) and poly (hydroquinone-iminocarbonate), polyurethanes, polyanhydrides, polymer drugs
- the porous substrate may be fabricated from a lactomer copolymer of glycolide and lactide derived from glycolic and lactic acids. In embodiments, the porous substrate may be fabricated from polyglyconate, a copolymer of glycolic acid and trimethylene carbonate.
- the porous substrate may be fabricated from a synthetic polyester composed of glycolide, dioxanone, and trimethylene carbonate.
- the polymer may include from about from about 50% to about 70% by weight glycolide, in embodiments, from about 55% to about 65% by weight glycolide, and in some embodiments, about 60% by weight glycolide; from about 4% to about 24% by weight dioxanone, in embodiments, from about 9% to about 19% by weight dioxanone, and in some embodiments, about 14% by weight dioxanone; and from about 16% to about 36% by weight trimethyl carbonate, in embodiments, from about 21% to about 31% by weight trimethyl carbonate, and in some embodiments, about 26% by weight trimethyl carbonate.
- the porous substrate may be fabricated from a copolymer of glycolide and trimethylene carbonate.
- the polymer may include from about 55% to about 75% by weight glycolide, in embodiments, about 60% to about 70% by weight glycolide, and in some embodiments, about 65% by weight glycolide, and from about 25% to about 45% by weight trimethylene carbonate, in embodiments, from about 30% to about 40% by weight trimethylene carbonate, and in some embodiments, about 35% by weight trimethylene carbonate.
- the filaments and/or buttresses formed therefrom are chemically modified to render at least a portion of a surface of the filaments and/or buttress hydrophilic.
- the treatment process may render all, or most, surfaces of the substrate hydrophilic, including the surfaces of the openings or pores. In embodiments, about 25% to about 99% of the surfaces of the substrate are rendered hydrophilic, in some embodiments, about 40% to about 95% of the surfaces, and in some further embodiments, about 60% to about 90% of the surfaces.
- the treatment process does not require a secondary material to be coated or bound to the porous substrate to impart hydrophilicity, although in alternate embodiments, the chemical modification may result from the deposition of a coating material on the surface to render it more hydrophilic.
- the chemical modification of the surface of the porous substrate may be by coronal discharge, low pressure plasma treatment, atmospheric plasma treatment, or other plasma technology systems.
- the treatment process functionalizes the surface of the substrate to render the surface more hydrophilic.
- a plasma treatment is used.
- the plasma may be formed of a single gas species such as oxygen, carbon dioxide, ammonia, nitrogen, or argon.
- oxygen for example, will result in surface activation of an oxygenate type, such as the formation of —OH, —CHO, and/or —COOH groups.
- other gases, mixtures of gases, vapours of volatile organic molecules such as alcohols, water, or open air plasma may also be utilized.
- ozone may be used in place of oxygen.
- the plasma gas may be produced using an oxygen-containing molecule, a nitrogen-containing molecule, or mixtures thereof.
- plasma gases may be used serially.
- the surface of the substrate is modified with the addition of oxygen, other charged species, and/or hydrophilic moieties that will increase hydrostatic interactions both with water molecules and with hydrophilic domains of biologic molecules, such as proteins.
- undesirable hydrophobic interactions such as protein hydrophobic domain bonding and loss of protein native structure, will be reduced at the substrate's surface, potentially minimizing adverse host inflammatory response.
- Plasma treatment apparatus 20 includes a chamber 21 including a rack 22 , such as a stainless steel rack, and a pair of parallel electrode plates 24 and 26 between which a plasma is formed.
- a radio frequency generator 23 is provided as a source of potential, with an output terminal of the generator 23 being connected to electrode plate 24 and electrode plate 26 being grounded, thereby providing means for generating an electrical field between the electrode plates 24 and 26 , in which field the plasma can be created and sustained.
- the apparatus 20 includes a plasma gas source 30 (typically a standard gas cylinder) connected through a gas inlet system 32 to the chamber 21 .
- the plasma gas source 30 includes a valve 36 for controlling the flow of gas through a supply line 34 .
- a purge gas source 42 such as helium, is also connected through a line 44 and valve 38 to gas inlet system 32 .
- a vacuum pump 40 is connected to the chamber 21 for reducing the gas pressure therein.
- the porous substrate (for example, as depicted in FIG. 1 ) is mounted within the chamber 21 on the rack 22 , positioned between electrode plates 24 and 26 .
- the rack 22 may be movable so that the porous substrate may be pulled through the chamber 21 .
- the porous substrate may travel through the plasma field between reels in a continuous reel to reel system requiring no support rack.
- the vacuum pump 40 is operated to reduce the pressure in the chamber 21 .
- the gas inlet system 32 is operated to permit reacting gas monomer from plasma gas source 30 to flow into the chamber 21 through the supply line 34 before generating a plasma.
- the plasma is created by applying the output of the radio frequency generator 23 to the electrode plate 24 .
- the power supplied by the generator 23 is at the minimum required to sustain the plasma, as higher powered plasma will only degrade the surface of the substrate.
- the reaction between the plasma and the substrate is allowed to proceed for a period of time determined by the desired thickness and surface energy on the substrate and the concentration of gas monomers in the reacting vapor.
- the pressure within the chamber 21 is measured by a capacitance manometer 46 to maintain appropriate pressure throughout the reaction period.
- valve 38 is Opened to permit gas to flow into the chamber 21 from purge gas source 42 to purge the substrate surface of highly reactive radicals which could cause premature contamination of the substrate's surface. Valve 38 is then closed, the chamber 21 is opened so that chamber 21 is returned to atmospheric pressure, and the plasma treated substrate is removed.
- the plasma treated substrate may then be sterilized by any means within the purview of those skilled in the art including, but not limited to, ethylene oxide, electron beam, gamma irradiation, autoclaving, plasma sterilization, and the like.
- conditions under which treatment occurs may be dependent upon a number of factors, such as the type, size, thickness, and porosity of material being treated, the type and concentration of gas species being utilized and the flow rate thereof, the plasma technology system being utilized, and plasma treatment conditions such as voltage, pressure, temperature, duration, and the like.
- the plasma may include from about 1% to about 100% by weight of oxygen, nitrogen, or argon, in embodiments, from about 15% to about 90% by weight of oxygen, nitrogen, or argon, and in some embodiments, from about 25% to about 75% by weight oxygen, nitrogen, or argon.
- the gas may have a mass flow rate of from about 10 sccm to about 200 seem, in embodiments, from about 25 seem to about 150 sccm, and in some embodiments, about 50 sccm to about 100 sccm.
- the plasma generating electrodes may operate at a power of about 25 watts to about 1000 watts, in embodiments, from about 50 watts to about 750 watts, and in some embodiments, about 100 watts to about 500 watts.
- the treatment pressure may be about 25 mtorr to about 500 mtorr, in embodiments, from about 50 mtorr to about 400 mtorr, and in some embodiments, from about 100 mtorr to about 250 mtorr.
- the treatment may occur at a temperature of less than 100° C., and, in embodiments, at ambient temperature.
- the length of exposure may range from about 10 seconds to about 120 minutes, in embodiments, from about 30 seconds to about 60 minutes, and in some embodiments, from about 2 minutes to about 30 minutes. It will be appreciated by those skilled in the art that the treatment conditions may be outside the ranges set forth as discussed above.
- the substrate treated in accordance with the present disclosure may also be subjected to a plasma polymerization process to form a polymer coating on at least a portion of the surface of the substrate.
- a plasma polymerization process to form a polymer coating on at least a portion of the surface of the substrate.
- the monomers used to form the polymer coating may be polymerized directly on the substrate's surface using plasma-state polymerization techniques generally known to those skilled in the art.
- the monomers are polymerized onto the surface of the substrate by activating the monomer in a plasma state.
- the plasma state generates highly reactive species, which form a highly cross-linked and highly-branched ultra-thin polymer coating, which is deposited on the surface of the substrate during plasma polymerization.
- a suitable organic monomer or a mixture of monomers having polymerizable unsaturated groups is introduced into the chamber where it is fragmented and/or activated forming further excited species in addition to the activated plasma gases.
- the excited species and fragments of the monomer recombine upon contact with the substrate's surface to form a largely undefined structure which contains a complex variety of different groups and chemical bonds and forms a highly cross-linked polymer coating on the surface of the substrate.
- oxygen, nitrogen, argon, or molecules possessing these elements are present, either within the plasma reactor during the polymer coating process or on exposure of the polymer coated substrate to oxygen or air subsequent to the plasma process, the polymeric deposit will include a variety of polar groups.
- plasma polymerization may utilize solvents such as diglyme and tetraglyme, to produced PEG-like surfaces.
- plasma polymerization may utilize fluorochemicals such as aliphatic fluorine-containing gases, to produced fluorinated polymer surfaces.
- the amount and relative position of polymer deposition on the substrates are influenced by at least three geometric factors: (1) location of the electrode plates and distribution of charge; (2) monomer flow; and (3) substrate position within the chamber.
- an electric discharge from the RF generator may be applied to the electrode plates within the chamber and the selected monomers may be introduced into the chamber and energized into a plasma, saturating the space between the electrode plates with an abundance of energetic free radicals and lesser amounts of ions and free electrons produced by the monomers.
- the substrate is passed through, or positioned between, the electrode plates, the surface of the substrate is bombarded with free radicals, resulting in the formation of the polymer coating.
- siloxane monomers with hydrophilic end groups may be used in the plasma polymerization process to produce polymer coatings on the substrate's surface.
- aliphatic hydrocyclosiloxane monomers, alone or mixed with co-monomers may be utilized to provide polymer coatings having a homogenous or mixed property coating. For example, by introducing reactive functionalizing monomers, organo-based monomers, or fluorocarbon monomers together with the aliphatic hydrocyclosiloxane monomers in the plasma polymerization system, physical pore size and chemical affinity of the plasma copolymerized aliphatic hydrocyclosiloxane coating with selective monomers can be controlled.
- the openings in the substrate may be partially or completely filled with filler material, such as uncrosslinked molecules, hydrogels, absorbable polymer spheres, or interpenetrating chemically or ionically crosslinked hydrogels.
- the filler material may fill about 5% to about 100% of the openings in the substrate, in some embodiments, about 10% to about 80% of the openings, and in some other embodiments, from about 25% to about 75% of the openings.
- the filler material may be incorporated into the buttress during fabrication, prior to plasma treatment, and/or may be incorporated into the substrate after plasma treatment.
- the structure of the porous substrate provides the infrastructure for the buttress or other medical device formed thereof and the filler material may provide a reservoir for the delivery of drugs or other factors from the substrate and/or a repository of protein, cell, or growth factor recruiting moieties that encourage tissue healing or cell growth when the medical device is implanted within the body.
- hydrogels may be used as a means to absorb blood and as carriers of thrombogenic agents for blood clotting and hemostasis at wound sites.
- Hydrogels can be modified with any number of conjugated molecules such as cell adhesion proteins, growth factors, peptides, and endogenous growth factor capturing molecules, such as heparin sulfate, to promote tissue ingrowth and healing.
- the filler material may include releasable factors that have an associated binding interaction that will release agents by unbinding and diffusion, or filler material degradation.
- filler materials which may be utilized in accordance with the present disclosure for example, include: anti-adhesives; antimicrobials; analgesics; antipyretics; anesthetics; antiepileptics; antihistamines; anti-inflammatories; cardiovascular drugs; diagnostic agents; sympathomimetics; cholinomimetics; antimuscarinics; antispasmodics; hormones; growth factors; muscle relaxants; adrenergic neuron blockers; antineoplastics; immunogenic agents; immunosuppressants; gastrointestinal drugs; diuretics; steroids; lipids; lipopolysaccharides; polysaccharides; platelet activating drugs; clotting factors; and enzymes. It is also intended that combinations of filler materials may be used.
- filler materials include: local anesthetics; non-steroidal antifertility agents; parasympathomimetic agents; psychotherapeutic agents; tranquilizers; decongestants; sedative hypnotics; steroids; sulfonamides; sympathomimetic agents; vaccines; vitamins; antimalarials; anti-migraine agents; anti-parkinson agents such as L-dopa; anti-spasmodics; anticholinergic agents (e.g., oxybutynin); antitussives; bronchodilators; cardiovascular agents, such as coronary vasodilators and nitroglycerin; alkaloids; analgesics; narcotics such as codeine, dihydrocodeinone, meperidine, morphine and the like; non-narcotics, such as salicylates, aspirin, acetaminophen, d-propoxyphene and the like; opioid receptor antagonists, such as naltrexone
- Suitable filler materials include: viruses and cells; peptides, polypeptides and proteins, as well as analogs, muteins, and active fragments thereof; immunoglobulins; antibodies; cytokines (e.g., lymphokines, monokines, chemokines); blood clotting factors; hemopoietic factors; interleukins (IL-2, IL-3, IL-4, IL-6); interferons ( ⁇ -IFN, ⁇ -IFN and ⁇ -IFN); erythropoietin; nucleases; tumor necrosis factor; colony stimulating factors (e.g., GCSF, GM-CSF, MCSF); insulin; anti-tumor agents and tumor suppressors; blood proteins such as fibrin, thrombin, fibrinogen, synthetic thrombin, synthetic fibrin, synthetic fibrinogen; gonadotropins (e.g., FSH, LH, CG, etc.); hormones and hormone analogs (e.g., growth hormones
- the filler material 50 a may be non-crosslinked molecules which are embedded within the openings 14 a of the substrate 12 a of the buttress 10 a by conventional methods within the purview of those skilled in the art, such as by solvent solution impregnation and subsequent solvent evaporation.
- non-crosslinked molecules which may be included with the above fillers include, for example, high molecular weight PEG, polyalkylene oxides such as PLURONICS, PEG-poly(alpha-hydroxy esters) block copolymers, poly(vinyl pyrrolidone), poly(vinyl alcohol), polyacrylates and polyacrylate copolymers, such as poly(acrylic acid), poly(methacrylic acid), poly(sodium acrylate), poly(2-hydroxyethyl methacrylate), poly (potassium sulfopropyl acrylate) and their copolymers, dextran, alginate, carboxymethyl cellulose, chitosan, hyaluronic acid, fibrin, gelatin, collagen, laminin, oxidized cellulose, and combinations thereof.
- PEG polyalkylene oxides
- PLURONICS PEG-poly(alpha-hydroxy esters) block copolymers
- poly(vinyl pyrrolidone) poly(viny
- FIG. 3B illustrates a buttress 10 b including a plurality of filler material 50 b in the form of beads.
- the beads 50 b may be incorporated into and/or onto at least a portion of the openings 14 b of the substrate 12 b in a systematic or random distribution pattern.
- the filler material 50 b itself may be shaped and formed into a bead 50 b .
- each bead may include a casing (not shown) made from a degradable polymeric material which defines a core containing a quantity of filler material 50 b therein.
- the beads 50 b may be entrapped within the buttress 10 b so that they may be delivered and held at the tissue site without appreciable bead migration.
- the beads 50 b may be blown onto, or laid into, the openings 14 b of the substrate 12 b during buttress fabrication as filaments are being deposited on a target surface so that the beads 50 b are trapped between filaments as intrafiber bonds form.
- Beads 50 b may be formed from hydrogels composed of PEG based polymers, dextran, pHEMA, carboxymethyl cellulose, or alginate, for example. Other materials for forming beads include, for example, polyalpha-hydroxy esters) configured as single or multilayered beads.
- charged dextran beads may be incorporated into buttress 10 b . It is envisioned that a variety of beads may be incorporated into a buttress 10 b of the present disclosure.
- FIG. 3C illustrates a buttress 10 e including an interpenetrating network of filler material 50 c .
- the openings 14 c of the porous substrate 12 c is impregnated with hydrogel precursors which are crosslinked to form the interpenetrating network 50 c throughout the buttress 10 c .
- Hydrogel precursors include, for example, PEG poly(alpha-hydroxy esters) block copolymers, hyaluronic acid, collagen, and alginate.
- a nonwoven material was formed from a glycolide trimethylene carbonate copolymer, having a melting temperature of approximately 215 degrees celsius.
- the polymer resin was melt extruded at a temperature of between about 180 and about 250 degrees celsius.
- a melt pump metered the Molten polymer into a die head.
- the polymer melt was forced through an array of holes in the die head.
- Various die head types have hole configurations ranging from 0.13 to 0.25 min in diameter.
- the temperature at the die head was about 240 degrees celsius at a head pressure of approximately 30 bar, depending on die head type.
- the polymer fibers exiting the die were forced onto a moving conveyor belt by means of compressed/blown hot air.
- the hot air had a temperature of between about 270 degrees celsius and about 290 degrees celsius, which is hotter than the melt temperature of the polymer.
- the conveyor belt speed was about 8 meters per minute.
- the fibers randomly landed on the conveyor belt and built up to several layers in thickness. Suction was applied through the conveyor belt surface to help compact the fibers against each other as they cooled.
- the material was then introduced into a calendaring roll device which heated and compressed the fabric material i.e., enhancing the polymer state of crystallization and thickness uniformity.
- the material was then collected and stored. In a subsequent process the material was annealed at a temperature of about 120 celsius to remove residual monomers and to allow any crystallization potential of the polymer to complete. Individual fiber diameters ranged from 5 ⁇ m to 30 ⁇ m.
- the resulting material has a porosity of about 50% to about 90%.
- the material thickness was about 230 ⁇ m.
- the material was then plasma treated.
- a first set of nonwoven buttresses, set A, were formed from a copolymer of glycolic acid and trimethylene carbonate.
- a second set of nonwoven buttresses, set B, were formed from a copolymer of glycolide (65%) and trimethylene carbonate (35%).
- the fibers of each buttress defined interconnected openings that extended throughout the buttress in a tortuous path.
- One buttress from each set was left untreated while a second buttress was plasma treated for 5 minutes at 500 Watts in a single gas atomosphere.
- each buttress was held in a pool of dyed albumin solution used to simulate blood, to both observe and measure liquid absorption by the buttresses. Results for each buttress are provided in FIG. 4 . As shown in FIG. 4 , the plasma treated buttresses provided greater liquid absorbance. The rate of wicking of each of the plasma treated buttresses is illustrated in FIG. 5 .
- a method of making an absorbent surgical buttress comprising: generating a plurality of fibers; collecting the plurality of fibers so that they adhere to one another and form a non-woven material; plasma treating at least a portion of a surface of the non-woven material with an ionizable gas species or combination of ionizable gas species configured to chemically modify or functionalize the surface of the non-woven material; and cutting the non-woven material into a desired shape for a surgical buttress.
- An absorbent surgical buttress comprising a non-woven material having a plurality of fibers adhered to one another, the fibers being formed from a melt extruded bioabsorbable polymeric material, the non-woven material being plasma treated on at least a portion of a surface of the non-woven material so that the surface is chemically modified or functionalized, the non-woven material being cut into a desired shape for the surgical buttress.
- a polymeric material selected from the group consisting of lactide homopolymer, glycolide homopolymer, polydioxanone homopolymer, glycolide trimethylene carbonate copolymer, glyeolide lactide copolymer, glycolide dioxanone trimethylene carbonate, and glycolide caprolactone trimethylene carbonate lactide.
- a method of preparing a medical device having a hydrophilic surface comprising: plasma treating at least a portion of a surface of a porous medical device with a gas species selected from the group consisting of oxygen, nitrogen, argon, and combinations thereof, the gas species being configured to functionalize the surface of the medical device and form a hydrophilic surface.
- plasma treating comprises: placing the medical device within a chamber between a pair of electrode plates; releasing the gas species into the chamber; and generating an electrical field between the pair of electrode plates to sustain a plasma.
- plasma treating further comprises: terminating the flow of the gas species into the chamber; and purging the surface of the medical device with an inert gas.
- a medical device comprising a plasma-treated porous substrate that is functionalized to provide a hydrophilic surface, the porous substrate including a filler material embedded within at least a portion of openings therein.
- the substrate is selected from the group consisting of buttresses, meshes, scaffolds, grafts, rings, sutures, patches, slings, pledgets, growth matrices, drug delivery devices, wound plugs, soft tissue repair devices, surgical prostheses, wound dressings, coverings, and gauzes.
- the filler material is selected from the group consisting of uncrosslinked molecules, hydrogels, absorbable polymer spheres, interpenetrating chemically or ionically crosslinked hydrogels, and combinations thereof.
Abstract
A medical device including a plasma-treated porous substrate that is functionalized to provide a hydrophilic surface, and a process for preparing such a medical device, are disclosed. The method includes plasma treating at least a portion of a surface of a porous substrate with a gas species selected from oxygen, nitrogen, argon, and combination thereof. The gas species is configured to functionalize the surface of the medical device and form a hydrophilic surface.
Description
- The present disclosure relates to medical devices, and more particularly, to surgical implants having a hydrophilic surface treatment for improved wettability and cellular attachment.
- The use of medical devices, and more specifically, implants, is known. However, the implants, once placed in situ, may dislocate or migrate and, thus, are frequently secured to tissue during surgery using surgical tacking devices or fasteners, such as staples, clips, tacks, sutures, and the like. Porous implants are often utilized for their ability to provide biologic fixation and integration into surrounding tissue. The increased surface area of the implant allows for tissue infiltration into the implant via pores. The rate of tissue ingrowth is limited, however, and influenced by factors such as the porosity of the implant, depth of the porosity, and length of time of implantation.
- It would be advantageous to provide an implant with improved fluid absorption and interaction with cells and biologic molecules. Such an implant would improve surgical site visibility during surgery by wicking away excess fluid, improve pooling of coagulation and growth factors near a wound site, and improve favorable host tissue interactions leading to infiltration and attachment of cell types important to wound healing.
- In accordance with aspects of the present disclosure, a method of making an absorbent surgical buttress, comprising: generating a plurality of fibers; collecting the plurality of fibers so that they adhere to one another and form a non-woven material; plasma treating at least a portion of a surface of the non-woven material with an ionizable gas species or combination of ionizable gas species configured to chemically modify or functionalize the surface of the non-woven material; and cutting the non-woven material into a desired shape for a surgical buttress.
- The method can include ionizable gas speciess selected from the group consisting of air, water vapor, oxygen, nitrogen, argon, and combinations thereof. In certain embodiments, the fibers are melt extruded. The method of making the buttress can include blowing hot air at the fibers as they exit a die head and before they are collected. The hot air blown at the fibers can have a temperature greater than or equal to the melting temperature of the fibers. In certain embodiments, the fibers are collected as they cool.
- In certain embodiments, the fibers are melt extruded from a polymer selected from the group consisting of lactide homopolymer, glycolide homopolymer, polydioxanone homopolymer, glycolide trimethylene carbonate copolymer, glycolide lactide copolymer, glycolide dioxanone trimethylene carbonate copolymer, and glycolide caprolactone trimethylene carbonate lactide copolymer.
- In certain embodiments, the fibers are made from a bioabsorbable polymeric material. The melting temperature of the polymer may be between about 180 and about 250 degrees celcius. In other embodiments, the melting temperature of the polymer is between about 80 degrees celcius and about 190 degrees celcius.
- The hot air can have a temperature of between about 270 and about 290 degrees celcius.
- In certain embodiments, the fibers are collected on a conveyor surface. The method can include applying heat and pressure to the non-woven material before plasma treating the non-woven material.
- In certain embodiments, the non-woven material is cut into a shape corresponding to the shape of a linear surgical stapler. In other embodiments, the non-woven material is cut into a shape corresponding to the shape of a circular surgical stapler.
- The fibers can be generated by melt extruding a copolymer of glycolide, caprolactone, trimethylene carbonate and lactide having a melting temperature between about 140 degrees celcius and about 185 degrees celcius. The hot air blown at the fibers can have a temperature between about 185 degrees celcius and about 195 degrees celcius.
- In certain embodiments, the fibers are generated by melt extruding dioxanone having a melting temperature between about 80 degrees celcius and about 125 degrees celcius. The air blown at the dioxanone fibers can have a temperature between about 145 degrees celcius and about 155 degrees celcius.
- In a further aspect of the present disclosure, an absorbent surgical buttress comprises a non-woven material having a plurality of fibers adhered to one another, the fibers being formed from a melt extruded bioabsorbable polymeric material, the non-woven material being plasma treated on at least a portion of a surface of the non-woven material so that the surface is chemically modified or functionalized, the non-woven material being cut into a desired shape for the surgical buttress.
- In certain embodiments, the fibers are formed from a polymeric material selected from the group consisting of lactide homopolymer, glycolide homopolymer, polydioxanone homopolymer, glycolide trimethylene carbonate copolymer, glycolide lactide copolymer, glycolide dioxanone trimethylene carbonate, and glycolide caprolactone trimethylene carbonate lactide.
- The fibers may be formed from a polymeric material having a melting temperature of between about 180 and 250 degrees celcius. In certain embodiments, the fibers are formed from a polymeric material having a melting temperature of between about 80 degrees celcius and about 190 degrees celcius
- In certain embodiments, the non-woven material is cut into a shape corresponding to the shape of a linear surgical stapler. In other embodiments, the non-woven material is cut into a shape corresponding to the shape of a circular surgical stapler.
- The foregoing objects and advantages of the disclosure will become more apparent from the reading of the following description in connection with the accompanying drawings, in which:
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FIG. 1 is a perspective view of a surgical buttress in accordance with an embodiment of the present disclosure; -
FIG. 2 is a schematic illustration of an apparatus which is suitable for carrying out plasma treatment of a substrate in accordance with the present disclosure; -
FIGS. 3A-3C are cross-sectional views of the surgical buttress ofFIG. 1 , possessing filler materials in accordance with embodiments of the present disclosure; -
FIG. 4 is a graph illustrating a comparison of liquid absorbance of untreated surgical buttresses and plasma treated surgical buttresses formed in accordance with an embodiment of the present disclosure; and -
FIG. 5 is a graph illustrating a comparison of the rate of wicking of the plasma treated surgical buttresses ofFIG. 4 . - The present disclosure is directed to medical devices that have been chemically modified to render at least a surface of a substrate of the medical device more hydrophilic than its native state. In the case of porous devices, this surface treatment may enable the device to more quickly absorb and/or wick fluids, such as blood, interstitial fluid, cerebral spinal fluid, exudates, etc.
- The following discussion includes a description of the presently disclosed medical device and an exemplary corresponding method of treating the same in accordance with the principles of the present disclosure. For the purposes of discussion, the medical device will be discussed in terms of a surgical buttress. However, those skilled in the art will appreciate the presently disclosed medical devices may be any surgical implant, such as meshes, scaffolds, grafts (e.g., fabrics and/or tubes), rings, sutures, patches, slings, pledgets, growth matrices, drug delivery devices, wound plugs, and, in general, soft tissue repair devices and surgical prostheses. In other embodiments, suitable medical devices may be topically applied medical products, such as wound dressings, coverings, gauzes, and the like, that can be used in medical/surgical procedures.
- Referring now to the figures, wherein like components are designated by like reference numerals throughout the several views,
FIG. 1 illustrates asurgical buttress 10, an example of a medical device in accordance with the present disclosure, including aporous substrate 12.Porous substrate 12 includesopenings 14, such as pores, voids, or holes over at least a portion of a surface thereof. The openings of the buttress of the present disclosure may be sized to permit fibroblast through-growth and ordered collagen laydown, resulting in integration of the buttress into the body. - The openings may be present as a surface characteristic or a bulk material property, which partially or completely penetrates the substrate, and may be uniformly or randomly distributed across portions thereof. The buttress may have an open-cell structure, where the openings are connected to each other, forming an interconnected network. In such embodiments, the openings may be in sufficient number and size so as to interconnect across the entire thickness of the substrate. In some embodiments, the openings do not extend across the entire thickness of the porous substrate, but rather are present at a portion of the surface thereof. Conversely, the buttress may be closed cell, where the openings are not interconnected. Those skilled in the art reading the present disclosure may envision other distribution patterns and configurations of the openings in the porous substrate. It is envisioned that the substrate may, in embodiments, be partially or fully non-porous.
- In embodiments, suitable materials for the porous substrate include, but are not limited to foams (e.g., open or closed cell foams). Where the porous substrate is a foam, the substrate may be formed using any method suitable to forming a foam or sponge including, but not limited to, lyophilization or freeze-drying of a composition. Suitable techniques for making foams are within the purview of those skilled in the art.
- In embodiments, openings may be formed in filamentous buttresses via the spaces formed between the filaments of the buttress. Alternatively, the buttress may be formed from a continuous yarn that is arranged in loops that give rise to the openings in the buttress. The size of the openings between the filaments and spacing therebetween may vary depending on the surgical application and desired implant characteristics as envisioned by those skilled in the art.
- The filaments may be made using any technique within the purview of those skilled in the art, such as, for example, extrusion, molding, and/or gel spinning. In embodiments, the filaments may be extruded through an extruder unit of a conventional type, such as those disclosed in U.S. Pat. Nos. 6,063,105, 6,203,564, and 6,235,869, the entire disclosures of each of which are incorporated by reference herein. In embodiments, filaments may be subsequently brought together into a group to form a yarn.
- Once formed, a plurality of the filaments may then be braided, twisted, aligned, fused, entangled, intertwined, or otherwise joined or arranged to form a variety of different buttress shapes and sizes. In embodiments, the filaments may be drawn, oriented, crinkled, twisted, braided, commingled, or air entangled to form the buttress. The filaments may be woven, knitted, interlaced, braided, or formed into a buttress by non-woven techniques. The structure of the buttress will vary depending upon the assembling technique utilized to form the device, as well as other factors, such as the type of fibers used, the tension at which the fibers are held, and the mechanical properties required of the buttress.
- In embodiments, knitting may be utilized to form a buttress of the present disclosure. Knitting involves, in embodiments, the intermeshing of filaments, or yarns thereof, to form loops or inter-looping of the filaments. In some embodiments, filaments may be warp-knitted thereby creating vertical interlocking loop chains and/or may be weft-knitted thereby creating rows of interlocking loop stitches across the buttress. In other embodiments, weaving may be utilized to form a buttress of the present disclosure. Weaving may include, in embodiments, the intersection of two sets of straight filaments, or yarns thereof, warp and weft, which cross and interweave at right angles to each other, or the interlacing of two filaments at right angles to each other. In some embodiments, the filaments may be arranged to form a net mesh which has isotropic or near isotropic tensile strength and elasticity.
- In an embodiment, a nonwoven material is formed from lactide homopolymer, glyciolide homopolymer, polydioxanone homopolymer, glycolide lactide copolymer, glycolide dioxanone trimethylene carbonate copolymer, glycolide caprolactone trimethylene carbonate lactide copolymer, or glycolide trimethylene carbonate copolymer. The polymer resin is melt extruded and the melt pump meters molten polymer into a die head. The melt pump speed is between about 2 and about 12 rpm. The polymer is forced through the array of holes in the die head, which has holes from about 0.13 mm diameter to about 0.3 mm diameter, in some embodiments, from about 0.175 mm diameter to about 0.25 mm diameter. The temperature at the die head is between about 200 degrees celsius and about 275 degrees celsius in some embodiments, from about 235 degrees celsius and about 255 degrees Celsius in some embodiments, and the pressure at the head is between about 10 bar and about 80 bar. The polymer fibers exiting the die are forced onto a conveyor belt by blowing hot air. The hot air has a temperature of between about 230 degrees celsius and about 325 degrees celsius in some embodiments, and from about 265 degrees celsius and about 295 degrees Celsius in some embodiments. The speed of the conveyor belt is between about 1 meter per minute and about 10 meters per minute. The fibers randomly land on the conveyor belt and build up to several layers in thickness. Suction is applied through the conveyor belt surface to help compact the fibers against each other as they cool. The material may be introduced into calendaring rolls to apply heat and pressure prior to being collected and staged. The material is then annealed to drive out any monomer and advance the crystallization of the polymer. Desirably, the material has a porosity of between about 50% and about 90%. The fiber diameters is between about 5 μm and about 100 μm. The material thickness is between about 150 μm and about 400 μm.
- It is contemplated that the fibers can be generated at lower temperatures. In certain embodiments, fibers are formed from a polymer having a lower melting temperature. For example, a copolymer of glycolide, caprolactone, trimethylene carbonate and lactide could be melt extruded at between about 140 degrees celcius and about 185 degrees celcius. The hot air blown at the fibers has a temperature between about 185 degrees celcius and about 195 degrees celcius. In another example, dioxanone is melt extruded at between about 80 degrees celcius and about 125 degrees celcius. The hot air blown at the dioxanone fibers has a temperature between about 145 degrees celcius and about 155 degrees celcius. Thus, the buttress may formed from fibers melt extruded from polymers having a melting temperature of between about 80 degrees celcius and about 190 degrees celcius.
- In embodiments, the filaments may be nonwoven and formed by mechanically, chemically, or thermally bonding the filaments, or yarns thereof, into a sheet or web in a random or systematic arrangement. For example, filaments may be mechanically bound by entangling the filaments to form the buttress by means other than knitting or weaving, such as matting, pressing, stitch-bonding, needlepunching, or otherwise interlocking the filaments to form a binderless network. In other embodiments, the filaments of the buttress may be chemically bound by use of an adhesive such as a hot melt adhesive, or thermally bound by applying a binder such as a powder, paste, or melt, and melting the binder on the sheet or web of filaments. In embodiments, the buttress may be spunbound and/or meltblown.
- The diameter of the individual filaments may be from about 5 μm to about 100 μm, in embodiments, from about 10 μm to about 40 μm in some embodiments, and from about 15 μm to about 35 μm in some embodiments, and in some further embodiments, from about 18 μm to about 33 μm. The finished fabric thickness may be from about 150 μm to about 400 μm in embodiments, and from about 150 μm to about 300 μm in some embodiments, and from about 200 μm to about 250 microns in some embodiments, and in some further embodiments about 230 μm. The finished fabric weight may be from about 75 g/m2 to about 100 g/m2, in embodiments, from about 80 g/m2 to about 95 g/m2, and in some embodiments, about 87 g/m2. It should be understood that different fabric thicknesses, weights, and porosities may be selected by varying manufacturing conditions.
- The porous substrate may include any biocompatible natural or synthetic material. The material may be bioabsorbable or non-bioabsorbable. It should of course be understood that any combination of natural, synthetic, bioabsorbable and non-bioabsorbable materials may be used to form the porous substrate.
- Suitable synthetic biodegradable materials include polymers such as those made from lactide, glycolide, caprolactone, valerolactone, carbonates (e.g., trimethylene carbonate, tetramethylene carbonate, and the like), dioxanones (e.g., 1,4-dioxanone), δ-valerolactone, 1,dioxepanones (e.g., 1,4-dioxepan-2-one and 1,5-dioxepan-2-one), ethylene glycol, ethylene oxide, esteramides, γ-hydroxyvalerate, β-hydroxypropionate, alpha-hydroxy acid, hydroxybuterates, poly (ortho esters), hydroxy alkanoates, tyrosine carbonates, poly(imide carbonates), poly(imino carbonates) such as poly (bisphenol A-iminocarbonate) and poly (hydroquinone-iminocarbonate), polyurethanes, polyanhydrides, polymer drugs (e.g., polydiflunisol, polyaspirin, and protein therapeutics), and copolymers and combinations thereof.
- In embodiments, the porous substrate may be fabricated from a lactomer copolymer of glycolide and lactide derived from glycolic and lactic acids. In embodiments, the porous substrate may be fabricated from polyglyconate, a copolymer of glycolic acid and trimethylene carbonate.
- In other embodiments, the porous substrate may be fabricated from a synthetic polyester composed of glycolide, dioxanone, and trimethylene carbonate. The polymer may include from about from about 50% to about 70% by weight glycolide, in embodiments, from about 55% to about 65% by weight glycolide, and in some embodiments, about 60% by weight glycolide; from about 4% to about 24% by weight dioxanone, in embodiments, from about 9% to about 19% by weight dioxanone, and in some embodiments, about 14% by weight dioxanone; and from about 16% to about 36% by weight trimethyl carbonate, in embodiments, from about 21% to about 31% by weight trimethyl carbonate, and in some embodiments, about 26% by weight trimethyl carbonate.
- In yet other embodiments, the porous substrate may be fabricated from a copolymer of glycolide and trimethylene carbonate. The polymer may include from about 55% to about 75% by weight glycolide, in embodiments, about 60% to about 70% by weight glycolide, and in some embodiments, about 65% by weight glycolide, and from about 25% to about 45% by weight trimethylene carbonate, in embodiments, from about 30% to about 40% by weight trimethylene carbonate, and in some embodiments, about 35% by weight trimethylene carbonate.
- In accordance with the present disclosure, the filaments and/or buttresses formed therefrom are chemically modified to render at least a portion of a surface of the filaments and/or buttress hydrophilic. The treatment process may render all, or most, surfaces of the substrate hydrophilic, including the surfaces of the openings or pores. In embodiments, about 25% to about 99% of the surfaces of the substrate are rendered hydrophilic, in some embodiments, about 40% to about 95% of the surfaces, and in some further embodiments, about 60% to about 90% of the surfaces. The treatment process does not require a secondary material to be coated or bound to the porous substrate to impart hydrophilicity, although in alternate embodiments, the chemical modification may result from the deposition of a coating material on the surface to render it more hydrophilic.
- The chemical modification of the surface of the porous substrate may be by coronal discharge, low pressure plasma treatment, atmospheric plasma treatment, or other plasma technology systems. The treatment process functionalizes the surface of the substrate to render the surface more hydrophilic.
- For example, in embodiments, a plasma treatment is used. The plasma may be formed of a single gas species such as oxygen, carbon dioxide, ammonia, nitrogen, or argon. The use of oxygen, for example, will result in surface activation of an oxygenate type, such as the formation of —OH, —CHO, and/or —COOH groups. It is envisioned that other gases, mixtures of gases, vapours of volatile organic molecules such as alcohols, water, or open air plasma may also be utilized. For example, ozone may be used in place of oxygen. In other examples, the plasma gas may be produced using an oxygen-containing molecule, a nitrogen-containing molecule, or mixtures thereof. In some embodiments, plasma gases may be used serially.
- The surface of the substrate is modified with the addition of oxygen, other charged species, and/or hydrophilic moieties that will increase hydrostatic interactions both with water molecules and with hydrophilic domains of biologic molecules, such as proteins. In turn, undesirable hydrophobic interactions, such as protein hydrophobic domain bonding and loss of protein native structure, will be reduced at the substrate's surface, potentially minimizing adverse host inflammatory response.
- An illustrative plasma treatment apparatus is shown in
FIG. 2 .Plasma treatment apparatus 20 includes a chamber 21 including arack 22, such as a stainless steel rack, and a pair ofparallel electrode plates radio frequency generator 23 is provided as a source of potential, with an output terminal of thegenerator 23 being connected toelectrode plate 24 andelectrode plate 26 being grounded, thereby providing means for generating an electrical field between theelectrode plates apparatus 20 includes a plasma gas source 30 (typically a standard gas cylinder) connected through agas inlet system 32 to the chamber 21. Theplasma gas source 30 includes avalve 36 for controlling the flow of gas through asupply line 34. Apurge gas source 42, such as helium, is also connected through a line 44 andvalve 38 togas inlet system 32. Avacuum pump 40 is connected to the chamber 21 for reducing the gas pressure therein. - In a typical reaction, the porous substrate (for example, as depicted in
FIG. 1 ) is mounted within the chamber 21 on therack 22, positioned betweenelectrode plates rack 22 may be movable so that the porous substrate may be pulled through the chamber 21. Alternatively, the porous substrate may travel through the plasma field between reels in a continuous reel to reel system requiring no support rack. Thevacuum pump 40 is operated to reduce the pressure in the chamber 21. Thegas inlet system 32 is operated to permit reacting gas monomer fromplasma gas source 30 to flow into the chamber 21 through thesupply line 34 before generating a plasma. - The plasma is created by applying the output of the
radio frequency generator 23 to theelectrode plate 24. The power supplied by thegenerator 23 is at the minimum required to sustain the plasma, as higher powered plasma will only degrade the surface of the substrate. The reaction between the plasma and the substrate is allowed to proceed for a period of time determined by the desired thickness and surface energy on the substrate and the concentration of gas monomers in the reacting vapor. The pressure within the chamber 21 is measured by acapacitance manometer 46 to maintain appropriate pressure throughout the reaction period. - Following the reaction period, the flow of gas from the
plasma gas source 30 is terminated, the power from thegenerator 23 sustaining the plasma is turned off, andvalve 38 is Opened to permit gas to flow into the chamber 21 frompurge gas source 42 to purge the substrate surface of highly reactive radicals which could cause premature contamination of the substrate's surface.Valve 38 is then closed, the chamber 21 is opened so that chamber 21 is returned to atmospheric pressure, and the plasma treated substrate is removed. - The plasma treated substrate may then be sterilized by any means within the purview of those skilled in the art including, but not limited to, ethylene oxide, electron beam, gamma irradiation, autoclaving, plasma sterilization, and the like.
- It should be understood that the conditions under which treatment occurs may be dependent upon a number of factors, such as the type, size, thickness, and porosity of material being treated, the type and concentration of gas species being utilized and the flow rate thereof, the plasma technology system being utilized, and plasma treatment conditions such as voltage, pressure, temperature, duration, and the like.
- For example, the plasma may include from about 1% to about 100% by weight of oxygen, nitrogen, or argon, in embodiments, from about 15% to about 90% by weight of oxygen, nitrogen, or argon, and in some embodiments, from about 25% to about 75% by weight oxygen, nitrogen, or argon. The gas may have a mass flow rate of from about 10 sccm to about 200 seem, in embodiments, from about 25 seem to about 150 sccm, and in some embodiments, about 50 sccm to about 100 sccm. The plasma generating electrodes may operate at a power of about 25 watts to about 1000 watts, in embodiments, from about 50 watts to about 750 watts, and in some embodiments, about 100 watts to about 500 watts. The treatment pressure may be about 25 mtorr to about 500 mtorr, in embodiments, from about 50 mtorr to about 400 mtorr, and in some embodiments, from about 100 mtorr to about 250 mtorr. The treatment may occur at a temperature of less than 100° C., and, in embodiments, at ambient temperature. The length of exposure may range from about 10 seconds to about 120 minutes, in embodiments, from about 30 seconds to about 60 minutes, and in some embodiments, from about 2 minutes to about 30 minutes. It will be appreciated by those skilled in the art that the treatment conditions may be outside the ranges set forth as discussed above.
- In embodiments, the substrate treated in accordance with the present disclosure may also be subjected to a plasma polymerization process to form a polymer coating on at least a portion of the surface of the substrate. Such methods are disclosed, for example, in U.S. Pat. No. 7,294,357, the entire disclosure of which is incorporated herein by this reference.
- The monomers used to form the polymer coating may be polymerized directly on the substrate's surface using plasma-state polymerization techniques generally known to those skilled in the art. In brief, the monomers are polymerized onto the surface of the substrate by activating the monomer in a plasma state. The plasma state generates highly reactive species, which form a highly cross-linked and highly-branched ultra-thin polymer coating, which is deposited on the surface of the substrate during plasma polymerization.
- In embodiments, a suitable organic monomer or a mixture of monomers having polymerizable unsaturated groups is introduced into the chamber where it is fragmented and/or activated forming further excited species in addition to the activated plasma gases. The excited species and fragments of the monomer recombine upon contact with the substrate's surface to form a largely undefined structure which contains a complex variety of different groups and chemical bonds and forms a highly cross-linked polymer coating on the surface of the substrate. If oxygen, nitrogen, argon, or molecules possessing these elements are present, either within the plasma reactor during the polymer coating process or on exposure of the polymer coated substrate to oxygen or air subsequent to the plasma process, the polymeric deposit will include a variety of polar groups.
- In embodiments, plasma polymerization may utilize solvents such as diglyme and tetraglyme, to produced PEG-like surfaces. In other embodiments, plasma polymerization may utilize fluorochemicals such as aliphatic fluorine-containing gases, to produced fluorinated polymer surfaces.
- The amount and relative position of polymer deposition on the substrates are influenced by at least three geometric factors: (1) location of the electrode plates and distribution of charge; (2) monomer flow; and (3) substrate position within the chamber. In practice, an electric discharge from the RF generator may be applied to the electrode plates within the chamber and the selected monomers may be introduced into the chamber and energized into a plasma, saturating the space between the electrode plates with an abundance of energetic free radicals and lesser amounts of ions and free electrons produced by the monomers. As the substrate is passed through, or positioned between, the electrode plates, the surface of the substrate is bombarded with free radicals, resulting in the formation of the polymer coating.
- In embodiments, siloxane monomers with hydrophilic end groups may be used in the plasma polymerization process to produce polymer coatings on the substrate's surface. In some embodiments, aliphatic hydrocyclosiloxane monomers, alone or mixed with co-monomers, may be utilized to provide polymer coatings having a homogenous or mixed property coating. For example, by introducing reactive functionalizing monomers, organo-based monomers, or fluorocarbon monomers together with the aliphatic hydrocyclosiloxane monomers in the plasma polymerization system, physical pore size and chemical affinity of the plasma copolymerized aliphatic hydrocyclosiloxane coating with selective monomers can be controlled. This allows the use of the copolymerized plasma polymer coating for applications which require the coating to differentiate between certain types of gases, ions, and molecules and it also may be utilized to introduce functional groups to the polymer coating which, in turn, can help link hydrophilic molecules to the polymer coating.
- The openings in the substrate may be partially or completely filled with filler material, such as uncrosslinked molecules, hydrogels, absorbable polymer spheres, or interpenetrating chemically or ionically crosslinked hydrogels. In embodiments, the filler material may fill about 5% to about 100% of the openings in the substrate, in some embodiments, about 10% to about 80% of the openings, and in some other embodiments, from about 25% to about 75% of the openings. The filler material may be incorporated into the buttress during fabrication, prior to plasma treatment, and/or may be incorporated into the substrate after plasma treatment.
- The structure of the porous substrate provides the infrastructure for the buttress or other medical device formed thereof and the filler material may provide a reservoir for the delivery of drugs or other factors from the substrate and/or a repository of protein, cell, or growth factor recruiting moieties that encourage tissue healing or cell growth when the medical device is implanted within the body.
- For example, hydrogels may be used as a means to absorb blood and as carriers of thrombogenic agents for blood clotting and hemostasis at wound sites. Hydrogels can be modified with any number of conjugated molecules such as cell adhesion proteins, growth factors, peptides, and endogenous growth factor capturing molecules, such as heparin sulfate, to promote tissue ingrowth and healing. In embodiments, the filler material may include releasable factors that have an associated binding interaction that will release agents by unbinding and diffusion, or filler material degradation.
- Examples of filler materials which may be utilized in accordance with the present disclosure for example, include: anti-adhesives; antimicrobials; analgesics; antipyretics; anesthetics; antiepileptics; antihistamines; anti-inflammatories; cardiovascular drugs; diagnostic agents; sympathomimetics; cholinomimetics; antimuscarinics; antispasmodics; hormones; growth factors; muscle relaxants; adrenergic neuron blockers; antineoplastics; immunogenic agents; immunosuppressants; gastrointestinal drugs; diuretics; steroids; lipids; lipopolysaccharides; polysaccharides; platelet activating drugs; clotting factors; and enzymes. It is also intended that combinations of filler materials may be used.
- Other filler materials include: local anesthetics; non-steroidal antifertility agents; parasympathomimetic agents; psychotherapeutic agents; tranquilizers; decongestants; sedative hypnotics; steroids; sulfonamides; sympathomimetic agents; vaccines; vitamins; antimalarials; anti-migraine agents; anti-parkinson agents such as L-dopa; anti-spasmodics; anticholinergic agents (e.g., oxybutynin); antitussives; bronchodilators; cardiovascular agents, such as coronary vasodilators and nitroglycerin; alkaloids; analgesics; narcotics such as codeine, dihydrocodeinone, meperidine, morphine and the like; non-narcotics, such as salicylates, aspirin, acetaminophen, d-propoxyphene and the like; opioid receptor antagonists, such as naltrexone and naloxone; anti-cancer agents; anti-convulsants; anti-emetics; antihistamines; anti-inflammatory agents, such as hormonal agents, hydrocortisone, prednisolone, prednisone, non-hormonal agents, allopurinol, indomethacin, phenylbutazone and the like; prostaglandins; cytotoxic drugs; chemotherapeutics, estrogens; antibacterials; antibiotics; anti-fungals; anti-virals; anticoagulants; anticonvulsants; antidepressants; antihistamines; and immunological agents.
- Examples of yet other suitable filler materials include: viruses and cells; peptides, polypeptides and proteins, as well as analogs, muteins, and active fragments thereof; immunoglobulins; antibodies; cytokines (e.g., lymphokines, monokines, chemokines); blood clotting factors; hemopoietic factors; interleukins (IL-2, IL-3, IL-4, IL-6); interferons (β-IFN, α-IFN and γ-IFN); erythropoietin; nucleases; tumor necrosis factor; colony stimulating factors (e.g., GCSF, GM-CSF, MCSF); insulin; anti-tumor agents and tumor suppressors; blood proteins such as fibrin, thrombin, fibrinogen, synthetic thrombin, synthetic fibrin, synthetic fibrinogen; gonadotropins (e.g., FSH, LH, CG, etc.); hormones and hormone analogs (e.g., growth hormone); vaccines (e.g., tumoral, bacterial and viral antigens); somatostatin; antigens; blood coagulation factors; growth factors (e.g., nerve growth factor, insulin-like growth factor); bone morphogenic proteins; TGF-B; protein inhibitors; protein antagonists; protein agonists; nucleic acids, such as antisense molecules, DNA, RNA, RNAi; oligonucleotides; polynucleotides; and ribozymes.
- As illustrated in
FIG. 3A , the filler material 50 a may be non-crosslinked molecules which are embedded within the openings 14 a of thesubstrate 12 a of the buttress 10 a by conventional methods within the purview of those skilled in the art, such as by solvent solution impregnation and subsequent solvent evaporation. Examples of non-crosslinked molecules which may be included with the above fillers include, for example, high molecular weight PEG, polyalkylene oxides such as PLURONICS, PEG-poly(alpha-hydroxy esters) block copolymers, poly(vinyl pyrrolidone), poly(vinyl alcohol), polyacrylates and polyacrylate copolymers, such as poly(acrylic acid), poly(methacrylic acid), poly(sodium acrylate), poly(2-hydroxyethyl methacrylate), poly (potassium sulfopropyl acrylate) and their copolymers, dextran, alginate, carboxymethyl cellulose, chitosan, hyaluronic acid, fibrin, gelatin, collagen, laminin, oxidized cellulose, and combinations thereof. -
FIG. 3B illustrates a buttress 10 b including a plurality of filler material 50 b in the form of beads. The beads 50 b may be incorporated into and/or onto at least a portion of the openings 14 b of the substrate 12 b in a systematic or random distribution pattern. In embodiments, the filler material 50 b itself may be shaped and formed into a bead 50 b. Alternatively, each bead may include a casing (not shown) made from a degradable polymeric material which defines a core containing a quantity of filler material 50 b therein. The beads 50 b may be entrapped within the buttress 10 b so that they may be delivered and held at the tissue site without appreciable bead migration. In embodiments, the beads 50 b may be blown onto, or laid into, the openings 14 b of the substrate 12 b during buttress fabrication as filaments are being deposited on a target surface so that the beads 50 b are trapped between filaments as intrafiber bonds form. Beads 50 b may be formed from hydrogels composed of PEG based polymers, dextran, pHEMA, carboxymethyl cellulose, or alginate, for example. Other materials for forming beads include, for example, polyalpha-hydroxy esters) configured as single or multilayered beads. In some embodiments, charged dextran beads may be incorporated into buttress 10 b. It is envisioned that a variety of beads may be incorporated into a buttress 10 b of the present disclosure. -
FIG. 3C illustrates a buttress 10 e including an interpenetrating network of filler material 50 c. In embodiments, the openings 14 c of the porous substrate 12 c is impregnated with hydrogel precursors which are crosslinked to form the interpenetrating network 50 c throughout the buttress 10 c. Hydrogel precursors include, for example, PEG poly(alpha-hydroxy esters) block copolymers, hyaluronic acid, collagen, and alginate. - The following non-limiting example illustrates the improved wettability of substrates formed in accordance with the present disclosure.
- A nonwoven material was formed from a glycolide trimethylene carbonate copolymer, having a melting temperature of approximately 215 degrees celsius. The polymer resin was melt extruded at a temperature of between about 180 and about 250 degrees celsius. A melt pump metered the Molten polymer into a die head. The polymer melt was forced through an array of holes in the die head. Various die head types have hole configurations ranging from 0.13 to 0.25 min in diameter. The temperature at the die head was about 240 degrees celsius at a head pressure of approximately 30 bar, depending on die head type. The polymer fibers exiting the die were forced onto a moving conveyor belt by means of compressed/blown hot air. The hot air had a temperature of between about 270 degrees celsius and about 290 degrees celsius, which is hotter than the melt temperature of the polymer. The conveyor belt speed was about 8 meters per minute. The fibers randomly landed on the conveyor belt and built up to several layers in thickness. Suction was applied through the conveyor belt surface to help compact the fibers against each other as they cooled. The material was then introduced into a calendaring roll device which heated and compressed the fabric material i.e., enhancing the polymer state of crystallization and thickness uniformity. The material was then collected and stored. In a subsequent process the material was annealed at a temperature of about 120 celsius to remove residual monomers and to allow any crystallization potential of the polymer to complete. Individual fiber diameters ranged from 5 μm to 30 μm. The resulting material has a porosity of about 50% to about 90%. The material thickness was about 230 μm. The material was then plasma treated.
- A first set of nonwoven buttresses, set A, were formed from a copolymer of glycolic acid and trimethylene carbonate. A second set of nonwoven buttresses, set B, were formed from a copolymer of glycolide (65%) and trimethylene carbonate (35%). The fibers of each buttress defined interconnected openings that extended throughout the buttress in a tortuous path. One buttress from each set was left untreated while a second buttress was plasma treated for 5 minutes at 500 Watts in a single gas atomosphere.
- An outer edge of each buttress was held in a pool of dyed albumin solution used to simulate blood, to both observe and measure liquid absorption by the buttresses. Results for each buttress are provided in
FIG. 4 . As shown inFIG. 4 , the plasma treated buttresses provided greater liquid absorbance. The rate of wicking of each of the plasma treated buttresses is illustrated inFIG. 5 . - The present disclosure also incorporates aspects described in the following numbered paragraphs.
- 1. A method of making an absorbent surgical buttress, comprising: generating a plurality of fibers; collecting the plurality of fibers so that they adhere to one another and form a non-woven material; plasma treating at least a portion of a surface of the non-woven material with an ionizable gas species or combination of ionizable gas species configured to chemically modify or functionalize the surface of the non-woven material; and cutting the non-woven material into a desired shape for a surgical buttress.
- 2. The method of making an absorbent surgical buttress according to claim 1, wherein the ionizable gas species is selected from the group consisting of air, water vapor, oxygen, nitrogen, argon, and combinations thereof.
- 3. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 2, wherein the fibers are melt extruded.
- 4. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 3, further comprising blowing hot air at the fibers as they exit a die head and before they are collected.
- 5. The method of making an absorbent surgical buttress according to any one of paragraphs 1 though 4, further comprising blowing hot air at the fibers as they exit the die head and before they are collected, the hot air having a temperature greater than or equal to the melting temperature of the fibers.
- 6. The method of making an absorbent surgical buttress according to any one of paragraphs 1 though 5, wherein the fibers are collected as they cool.
- 7. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 6, wherein the fibers are melt extruded from a polymer selected from the group consisting of lactide homopolymer, glycolide homopolymer, polydioxanone homopolymer, glycolide trimethylene carbonate copolymer, glycolide lactide copolymer, glycolide dioxanone trimethylene carbonate copolymer, and glycolide caprolactone trimethylene carbonate lactide copolymer.
- 8. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 7, wherein the fibers are made from a bioabsorbable polymeric material.
- 9. The method of making an absorbent surgical buttress according to any one of paragraph 1 through 8, wherein the melting temperature of the polymer is between about 180 and about 250 degrees celcius.
- 10. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 9, wherein the melting temperature of the polymer is between about 80 degrees celsius and about 190 degrees celcius.
- 11. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 10, wherein the hot air has a temperature of between about 270 and about 290 degrees celcius.
- 12. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 11, wherein the fibers are collected on a conveyor surface.
- 13. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 12, further comprising applying heat and pressure to the non-woven material before plasma treating the non-woven material.
- 14. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 13, wherein the non-woven material is cut into a shape corresponding to the shape of a linear surgical stapler.
- 15. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 14, wherein the non-woven material is cut into a shape corresponding to the shape of a circular surgical stapler.
- 16. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 15, wherein the fibers are generated by melt extruding a copolymer of glycolide, caprolactone, trimethylene carbonate and lactide having a melting temperature between about 140 degrees celcius and about 185 degrees celcius.
- 17. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 16, wherein the hot air blown at the fibers has a temperature between about 185 degrees celcius and about 195 degrees celcius.
- 18. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 17, wherein the fibers are generated by melt extruding dioxanone having a melting temperature between about 80 degrees celcius and about 125 degrees celcius.
- 19. The method of making an absorbent surgical buttress according to any one of paragraphs 1 through 18, wherein the air blown at the dioxanone fibers has a temperature between about 145 degrees celcius and about 155 degrees celcius
- 20. An absorbent surgical buttress, comprising a non-woven material having a plurality of fibers adhered to one another, the fibers being formed from a melt extruded bioabsorbable polymeric material, the non-woven material being plasma treated on at least a portion of a surface of the non-woven material so that the surface is chemically modified or functionalized, the non-woven material being cut into a desired shape for the surgical buttress.
- 21. The absorbent surgical buttress according to
paragraph 20, wherein the fibers are formed from a polymeric material selected from the group consisting of lactide homopolymer, glycolide homopolymer, polydioxanone homopolymer, glycolide trimethylene carbonate copolymer, glyeolide lactide copolymer, glycolide dioxanone trimethylene carbonate, and glycolide caprolactone trimethylene carbonate lactide. - 22. The absorbent surgical buttress according to any one of
paragraphs 20 through 21, wherein the fibers are formed from a polymeric material having a melting temperature of between about 180 and 250 degrees celcius. - 23. The absorbent surgical buttress according to any one of
paragraphs 20 through 22, wherein the fibers are formed from a polymeric material having a melting temperature of between about 80 degrees celcius and about 190 degrees celcius - 24. The absorbent surgical buttress according to any one of
paragraphs 20 through 23, wherein the non-woven material is cut into a shape corresponding to the shape of a linear surgical stapler. - 25. The absorbent surgical buttress according to any one of
paragraphs 20 through 24, wherein the non-woven material is cut into a shape corresponding to the shape of a circular surgical stapler. - 26. A method of preparing a medical device having a hydrophilic surface, the method comprising: plasma treating at least a portion of a surface of a porous medical device with a gas species selected from the group consisting of oxygen, nitrogen, argon, and combinations thereof, the gas species being configured to functionalize the surface of the medical device and form a hydrophilic surface.
- 27. The method of
paragraph 26, wherein plasma treating comprises: placing the medical device within a chamber between a pair of electrode plates; releasing the gas species into the chamber; and generating an electrical field between the pair of electrode plates to sustain a plasma. - 28. The method of paragraph 27, wherein plasma treating further comprises: terminating the flow of the gas species into the chamber; and purging the surface of the medical device with an inert gas.
- The method of any one of
paragraphs 26 through 28, further comprising sterilizing the plasma treated medical device. - The method of any one of
paragraphs 26 through 29, further comprising introducing a filler material into openings of the medical device. - The method of any one of
paragraphs 26 through 30, further comprising coating at least a portion of the surface of the medical device with monomers including hydrophilic end groups. - 32. The method of any one of
paragraphs 26 through 31, further comprising polymerizing at least a portion of the surface of the medical device with functionalizing monomers by introducing the monomers into the chamber with the gas species. - 33. A medical device comprising a plasma-treated porous substrate that is functionalized to provide a hydrophilic surface, the porous substrate including a filler material embedded within at least a portion of openings therein.
- 34. The medical device of paragraph 33, wherein the substrate is selected from the group consisting of buttresses, meshes, scaffolds, grafts, rings, sutures, patches, slings, pledgets, growth matrices, drug delivery devices, wound plugs, soft tissue repair devices, surgical prostheses, wound dressings, coverings, and gauzes.
- 35. The medical device of any one of
paragraph 33 and 34, wherein the substrate is fabricated from a synthetic biodegradable polymer. - 36. The medical device of any one of paragraphs 33 through 35, wherein the synthetic biodegradable polymer is selected from the group consisting of lactide, glycolide, caprolactone, trimethyl carbonate, dioxanone, and copolymers and combinations thereof.
- 37. The medical device of any one of paragraphs 33 through 36, wherein the substrate is fibrous and includes openings formed between fibers thereof.
- 38. The medical device of any one of paragraphs 33 through 37, wherein the substrate is nonwoven.
- 39. The medical device of any one of paragraphs 33 through 38, wherein the filler material is selected from the group consisting of uncrosslinked molecules, hydrogels, absorbable polymer spheres, interpenetrating chemically or ionically crosslinked hydrogels, and combinations thereof.
- While the above description contains many specifics, these specifics should not be construed as limitations on the scope of the present disclosure, but merely as exemplifications of embodiments thereof. It is envisioned that the elements and features illustrated or described in connection with one exemplary embodiment may be combined with the elements and features of another exemplary embodiment without departing from the scope of the present disclosure, and that such modifications and variations are also intended to be included within the scope of the present disclosure. Those skilled in the art will envision many other possible variations that are within the scope and spirit of the present disclosure.
Claims (25)
1. A method of making an absorbent surgical buttress, comprising:
generating a plurality of fibers;
collecting the plurality of fibers so that they adhere to one another and form a non-woven material;
plasma treating at least a portion of a surface of the non-woven material with an ionizable gas species or combination of ionizable gas species configured to chemically modify or functionalize the surface of the non-woven material; and
cutting the non-woven material into a desired shape for a surgical buttress.
2. The method of making an absorbent surgical buttress according to claim 1 , wherein the ionizable gas species is selected from the group consisting of air, water vapor, oxygen, nitrogen, argon, and combinations thereof.
3. The method of making an absorbent surgical buttress according to claim 1 , wherein the fibers are melt extruded.
4. The method of making an absorbent surgical buttress according to claim 3 , further comprising blowing hot air at the fibers as they exit a die head and before they are collected.
5. The method of making an absorbent surgical buttress according to claim 3 , further comprising blowing hot air at the fibers as they exit the die head and before they are collected, the hot air having a temperature greater than or equal to the melting temperature of the fibers.
6. The method of making an absorbent surgical buttress according to claim 4 , wherein the fibers are collected as they cool.
7. The method of making an absorbent surgical buttress according to claim 1 , wherein the fibers are melt extruded from a polymer selected from the group consisting of lactide homopolymer, glycolide homopolymer, polydioxanone homopolymer, glycolide trimethylene carbonate copolymer, glycolide lactide copolymer, glycolide dioxanone trimethylene carbonate copolymer, and glycolide caprolactone trimethylene carbonate lactide copolymer.
8. The method of making an absorbent surgical buttress according to claim 1 , wherein the fibers are made from a bioabsorbable polymeric material.
9. The method of making an absorbent surgical buttress according to claim 3 , wherein the melting temperature of the polymer is between about 180 and about 250 degrees celcius.
10. The method of making an absorbent surgical buttress according to claim 3 , wherein the melting temperature of the polymer is between about 80 degrees celcius and about 190 degrees celsius.
11. The method of making an absorbent surgical buttress according to claim 4 , wherein the hot air has a temperature of between about 270 and about 290 degrees celcius.
12. The method of making an absorbent surgical buttress according to claim 1 , wherein the fibers are collected on a conveyor surface.
13. The method of making an absorbent surgical buttress according to claim 1 , further comprising applying heat and pressure to the non-woven material before plasma treating the non-woven material.
14. The method of making an absorbent surgical buttress according to claim 1 , wherein the non-woven material is cut into a shape corresponding to the shape of a linear surgical stapler.
15. The method of making an absorbent surgical buttress according to claim 1 , wherein the non-woven material is cut into a shape corresponding to the shape of a circular surgical stapler.
16. The method of making an absorbent surgical buttress according to claim 4 , wherein the fibers are generated by melt extruding a copolymer of glycolide, caprolactone, trimethylene carbonate and lactide having a melting temperature between about 140 degrees celcius and about 185 degrees celcius.
17. The method of making an absorbent surgical buttress according to claim 16 , wherein the hot air blown at the fibers has a temperature between about 185 degrees celcius and about 195 degrees celcius.
18. The method of making an absorbent surgical buttress according to claim 4 , wherein the fibers are generated by melt extruding dioxanone having a melting temperature between about 80 degrees celcius and about 125 degrees celsius.
19. The method of making an absorbent surgical buttress according to claim 18 , wherein the air blown at the dioxanone fibers has a temperature between about 145 degrees celcius and about 155 degrees celcius
20. An absorbent surgical buttress, comprising a non-woven material having a plurality of fibers adhered to one another, the fibers being formed from a melt extruded bioabsorbable polymeric material, the non-woven material being plasma treated on at least a portion of a surface of the non-woven material so that the surface is chemically modified or functionalized, the non-woven material being cut into a desired shape for the surgical buttress.
21. The absorbent surgical buttress according to claim 20 , wherein the fibers are formed from a polymeric material selected from the group consisting of lactide homopolymer, glycolide homopolymer, polydioxanone homopolymer, glycolide trimethylene carbonate copolymer, glycolide lactide copolymer, glycolide dioxanone trimethylene carbonate, and glycolide caprolactone trimethylene carbonate lactide.
22. The absorbent surgical buttress according to claim 20 , wherein the fibers are formed from a polymeric material having a melting temperature of between about 180 and 250 degrees celcius.
23. The absorbent surgical buttress according to claim 20 , wherein the fibers are formed from a polymeric material having a melting temperature of between about 80 degrees celcius and about 190 degrees celcius.
24. The absorbent surgical buttress according to claim 20 , wherein the non-woven material is cut into a shape corresponding to the shape of a linear surgical stapler.
25. The absorbent surgical buttress according to claim 20 , wherein the non-woven material is cut into a shape corresponding to the shape of a circular surgical stapler.
Priority Applications (8)
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AU2012244274A AU2012244274B2 (en) | 2011-11-10 | 2012-10-30 | Hydrophilic medical devices |
CA2794238A CA2794238C (en) | 2011-11-10 | 2012-10-31 | Hydrophilic medical devices |
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US13/293,215 US20130123816A1 (en) | 2011-11-10 | 2011-11-10 | Hydrophilic medical devices |
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Also Published As
Publication number | Publication date |
---|---|
EP2591813A2 (en) | 2013-05-15 |
CA2794238C (en) | 2020-04-21 |
AU2012244274B2 (en) | 2014-06-05 |
AU2012244274A1 (en) | 2013-05-30 |
US20180339087A1 (en) | 2018-11-29 |
US10624998B2 (en) | 2020-04-21 |
EP2591813A3 (en) | 2014-11-26 |
CA2794238A1 (en) | 2013-05-10 |
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