# US 9,750,850 B2 · Dynamic porous coating for orthopedic implant > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,750,850 B2 - Document ID: US9750850B2 - Status: Granted - Kind: B2 - Application number: 14/879,221 - Filed: 2015-10-09 - Published: 2016-06-09 - Granted: 2017-09-05 - Earliest claimed: 2012-02-09 - Assignees: Arthrex, Inc. - Applicants: MX Orthopedics, Corp. - Inventors: Matthew Fonte; Matthew Palmer - Web page: https://patentgrep.com/patent/US9750850B2 ## CPC - A61L 27/56: Porous materials, {e.g. foams or sponges} - A61F 2/28: Bones - A61F 2/30767: {Special external or bone-contacting surface, e.g. coating for improving bone ingrowth} - A61F 2/30907: {Nets or sleeves applied to surface of prostheses or in cement} - A61F 2/3662: {Femoral shafts} - A61L 27/306: {Other specific inorganic materials not covered by A61L27/303 - A61L27/32} - A61F 2/3094: {Designing or manufacturing processes} - A61F 2/34: Acetabular cups - A61F 2/38: for elbows or knees - A61F 2002/30092: {using shape memory or superelastic materials, e.g. nitinol} - A61F 2002/3028: {polyhedral different from parallelepipedal and pyramidal} - A61F 2002/30579: {with mechanically expandable devices, e.g. fixation devices} - A61F 2002/3084: {Nanostructures} - A61F 2002/30911: {having a honeycomb structure} - A61F 2002/30912: {made of expanded metal, e.g. diamond mesh or metal nets having lozenge-shaped apertures} - A61F 2002/30914: {Details of the mesh structure, e.g. disposition of the woven warp and weft wires} - A61F 2002/30915: {made of a stack of bonded perforated sheets, grids or wire meshes} - A61F 2002/30919: {Sleeves} - A61F 2002/3092: {having an open-celled or open-pored structure} - A61F 2002/30929: {having at least two superposed coatings} - A61L 2400/16: Materials with shape-memory or superelastic properties - A61L 2430/02: for reconstruction of bones; weight-bearing implants - 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 (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K) - 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 (dental prosthetics A61C) ## Abstract A dynamic porous coating for an orthopedic implant, wherein the dynamic porous coating is adapted to apply an expansive force against adjacent bone so as to fill gaps between the dynamic porous coating and adjacent bone and to create an interference fit between the orthopedic implant and the adjacent bone. ## Claims ### Claim 1 A method for providing therapy to a patient, the method comprising the steps of: inserting an orthopedic implant into a bone cavity in a patient so that a dynamic porous coating applies an expansive force against an adjacent bone so as to fill gaps between the dynamic porous coating and the adjacent bone and to create an interference fit between the orthopedic implant and the adjacent bone, wherein the orthopedic implant comprises: a substrate, the dynamic porous coating secured to the substrate, and a coating on the dynamic porous coating, wherein the dynamic porous coating comprises a plurality of layers, and the dynamic porous coating comprises a network of interconnecting pores. ### Claim 2 (depends on 1) The method according to claim 1 wherein the dynamic porous coating comprises a shape memory material or a superelastic alloy. ### Claim 3 (depends on 2) The method according to claim 2 wherein the shape memory material or the superelastic alloy is Nitinol. ### Claim 4 (depends on 2) The method according to claim 2 wherein the expansive force is created by superelasticity of the shape memory material. ### Claim 5 (depends on 2) The method according to claim 2 wherein the expansive force is created by a shape memory effect of the shape memory material. ### Claim 6 (depends on 1) The method according to claim 1 wherein the dynamic porous coating comprises a metal powder with a particle size between 10 μm and 200 μm. ### Claim 7 (depends on 1) The method according to claim 1 wherein the dynamic porous coating is formed of sintered layers of powder that create a three-dimensional porous coating. ### Claim 8 (depends on 1) The method according to claim 1 wherein the orthopedic implant includes a solid region for attachment to the substrate. ### Claim 9 (depends on 1) The method according to claim 1 wherein the dynamic porous coating has a major pore size between 500 μm and 600 μm and interconnecting pores between 150 μm and 300 μm. ### Claim 10 (depends on 1) The method according to claim 1 wherein the additively manufactured porous coating has a trabecular structure. ### Claim 11 (depends on 1) The method according to claim 1 wherein the dynamic porous coating has a dodecahedron structure. ### Claim 12 (depends on 1) The method according to claim 1 wherein the expansive force applied by the dynamic porous coating causes bone remodeling. ### Claim 13 (depends on 1) The method according to claim 1 wherein the orthopedic implant is inserted into the patient during revision surgery. ### Claim 14 An orthopedic implant comprising: a substrate, a dynamic porous coating secured to the substrate, and a coating on the dynamic porous coating, wherein the dynamic porous coating comprises a plurality of layers, wherein the dynamic porous coating comprises a network of interconnecting pores, wherein the dynamic porous coating is adapted to apply an expansive force against adjacent bone, and wherein the coating covers the dynamic porous coating. ### Claim 15 (depends on 14) The implant according to claim 14 wherein the dynamic porous coating comprises a shape memory material or a superelastic alloy. ### Claim 16 (depends on 15) The implant according to claim 15 wherein the shape memory material or the superelastic alloy is Nitinol. ### Claim 17 (depends on 15) The implant according to claim 15 wherein the expansive force is created by a superelasticity of the shape memory material. ### Claim 18 (depends on 15) The implant according to claim 15 wherein the expansive force is created by a shape memory effect of the shape memory material. ### Claim 19 (depends on 14) The implant according to claim 14 wherein the dynamic porous coating comprises a metal powder with a particle size between 10 μm and 200 μm. ### Claim 20 (depends on 14) The implant according to claim 14 wherein the dynamic porous coating is formed of sintered layers of powder that create a three-dimensional porous coating. ### Claim 21 (depends on 14) The implant according to claim 14 wherein the orthopedic implant includes a solid region for attachment to the substrate. ### Claim 22 (depends on 14) The implant according to claim 14 wherein the dynamic porous coating has a major pore size between 500 μm and 600 μm and interconnecting pores between 150 μm and 300 μm. ### Claim 23 (depends on 14) The implant according to claim 14 wherein the dynamic porous coating has a trabecular structure. ### Claim 24 (depends on 14) The implant according to claim 14 wherein the dynamic porous coating has a dodecahedron structure. ### Claim 25 (depends on 14) implant according to claim 14 wherein the expansive force applied by the dynamic porous coating causes bone remodeling. ### Claim 26 (depends on 14) The implant according to claim 14 wherein the orthopedic implant is inserted into the patient during revision surgery. ### Claim 27 (depends on 1) The method according to claim 1 wherein the coating is titanium or hydroxylapatite. ### Claim 28 (depends on 1) The method according to claim 1 wherein the coating is a tricalcium phosphate paste, the method including the steps of applying the tricalcium phosphate paste to the dynamic porous coating, compressing the dynamic porous coating with a compression force, drying the tricalcium phosphate paste to a tricalcium phosphate coating, and removing the compressive force. ### Claim 29 (depends on 28) The method according to claim 28 including the step of inserting the orthopedic implant in a medullary canal, dissolving the tricalcium phosphate coating in a solution, and allowing the dynamic porous coating to expand to fill gaps between the orthopedic implant and the adjacent bone. ### Claim 30 (depends on 1) The method according to claim 1 including the step of wrapping or sliding the dynamic porous coating over the substrate. ### Claim 31 (depends on 1) The method according to claim 1 including the step of modifying a surface of the dynamic porous coating to provide nano-texturing. ### Claim 32 (depends on 14) The implant according to claim 14 including the step of sintering a powder to a surface of the dynamic porous coating. ### Claim 33 (depends on 14) The implant according to claim 14 wherein the coating is titanium or hydroxylapatite. ### Claim 34 (depends on 14) The implant according to claim 14 wherein the coating is a tricalcium phosphate.