EP1404257A1 - Protheses articulaires orthopediques - Google Patents

Protheses articulaires orthopediques

Info

Publication number
EP1404257A1
EP1404257A1 EP20020749005 EP02749005A EP1404257A1 EP 1404257 A1 EP1404257 A1 EP 1404257A1 EP 20020749005 EP20020749005 EP 20020749005 EP 02749005 A EP02749005 A EP 02749005A EP 1404257 A1 EP1404257 A1 EP 1404257A1
Authority
EP
European Patent Office
Prior art keywords
components
component
joint prosthesis
joint
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20020749005
Other languages
German (de)
English (en)
Inventor
Peter Hatto
John Fisher
Richard Farrar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DePuy International Ltd
Ionbond Ltd
Original Assignee
DePuy International Ltd
Ionbond Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DePuy International Ltd, Ionbond Ltd filed Critical DePuy International Ltd
Publication of EP1404257A1 publication Critical patent/EP1404257A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/28—Materials for coating prostheses
    • A61L27/30—Inorganic materials
    • A61L27/306—Other specific inorganic materials not covered by A61L27/303 - A61L27/32
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • 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
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/02—Inorganic materials
    • A61L27/04—Metals or alloys
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/3094—Designing or manufacturing processes
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
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    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/38—Joints for elbows or knees
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/38—Joints for elbows or knees
    • A61F2/3804—Joints for elbows or knees for elbows
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/40—Joints for shoulders
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4202—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for ankles
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4225—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for feet, e.g. toes
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4241—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for hands, e.g. fingers
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4261—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for wrists
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/468—Testing instruments for artificial joints
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
    • A61F2002/30682—Means for preventing migration of particles released by the joint, e.g. wear debris or cement particles
    • A61F2002/30685—Means for reducing or preventing the generation of wear particulates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2002/30934—Special articulating surfaces
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3611—Heads or epiphyseal parts of femur
    • A—HUMAN NECESSITIES
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    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A—HUMAN NECESSITIES
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    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
    • A—HUMAN NECESSITIES
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    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00598—Coating or prosthesis-covering structure made of compounds based on metal oxides or hydroxides
    • A61F2310/00622—Coating made of chromium oxide or hydroxides
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    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
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    • A61F2310/0073—Coating or prosthesis-covering structure made of compounds based on metal carbides
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    • A61F2310/00856—Coating or prosthesis-covering structure made of compounds based on metal nitrides
    • A61F2310/0088—Coating made of titanium nitride
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    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00856—Coating or prosthesis-covering structure made of compounds based on metal nitrides
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    • A—HUMAN NECESSITIES
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    • 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
    • A61L2430/00—Materials or treatment for tissue regeneration
    • A61L2430/24—Materials or treatment for tissue regeneration for joint reconstruction

Definitions

  • This invention relates to an orthopaedic joint prosthesis, which comprises a first joint component and a secondjoint component, each having a bearing surface which engages the corresponding bearing surface of the other component when the prosthesis is implanted.
  • Orthopaedic joint prostheses are known for replacement of natural joints such as a hip, knee, ankle and shoulder joint.
  • Joint replacement generally involves removal of tissue from each of the articulating bones of the joint, and implantation of prosthesis components in the bones.
  • a joint prosthesis it is common for a joint prosthesis to comprise components whose mating articulating surfaces comprise a metal and a polymer respectively (a "metal-on-polymer" joint).
  • the bearing surface on one of the components might comprise a cobalt-chrome- molybdenum alloy and the corresponding bearing surface on the other component might comprise a high molecular weight polyethylene.
  • the surfaces of both components are finished so that they are smooth.
  • the polymeric component is subject to gradual wear, forming fine particles of the polymer.
  • the present invention provides an orthopaedic joint prosthesis in which each of the articulating prosthesis components has a metal body which has a ceramic coating applied to it at the bearing surface, the coating comprising a chromium compound and being at least 5 ⁇ m thick.
  • the invention provides an orthopaedic joint prosthesis, which comprises a first joint component and a secondjoint component, each being formed from a metal body and having a bearing surface which engages the corresponding bearing surface of the other component when the prosthesis is implanted, in which each of the metal bodies has a ceramic coating applied to it at the bearing surface, the coating comprising a chromium compound and being at least about 5 ⁇ m thick.
  • the prosthesis of the invention has the advantage that the susceptibility to failure due to cohesive failure of the coating can be reduced compared with prostheses in which bearing surfaces are provided by materials other than ceramic chromium compounds.
  • This advantage is available, notwithstanding the greater thickness of the coatings compared with thin coatings as are used conventionally, for example with thicknesses of no more than 2 to 3 ⁇ m. This property is believed to arise from characteristics of the chromium compounds.
  • the advantage arising from the lower susceptibility to cohesive failure can offset slightly reduced hardness (and therefore potentially slightly increased wear rates) compared with certain other ceramic materials that are used to coat prosthesis bearing surfaces.
  • the ability to provide thick ceramic coatings in the prosthesis of the present invention has the advantage that the prosthesis is able to accommodate initial wear as the bearing surfaces of the components conform to one another. Small mis-matches in the shapes of the bearing surfaces of articulating components can give rise to initial localised wear of 1 to 3 ⁇ m. This can account for the entire thickness of conventional thin coatings.
  • the thickness of the coating is at least about 6 ⁇ m, more preferably at least about 7 ⁇ m, especially at least about 8 ⁇ m, for example about 10 ⁇ m or more.
  • the thickness of the coating will generally be less than about 25 ⁇ m, for example less than about 20 ⁇ m, or less than about 15 ⁇ m.
  • the chromium compounds which are used to provide the coatings can include one or more of chromium oxide, chromium nitride, chromium carbonitride and chromium carbide.
  • chromium oxide chromium oxide
  • chromium nitride chromium nitride
  • chromium carbonitride chromium carbide.
  • nitride and carbonitride are preferred.
  • the difference between the hardnesses of the materials of the coatings which are applied to the first and secondjoint components is less than about 5000 MPa, more preferably less than about 2500 MPa, especially less than about 1000 MPa. It is particularly preferred that the hardnesses of the materials of the coatings is approximately the same.
  • different chromium compounds can be used on the articulating surfaces of two prosthesis components. For example, the bearing surface of one component might be coated with CrN and the corresponding bearing surface of the other component might be coated with CrCN.
  • the materials of the coatings which are applied to the first and secondjoint components are the same.
  • the metal which is used for the body of at least one of the components preferably each of the components, has a modulus of at least about 150 GPa, more preferably at least about 175 GPa, especially at least about 200 GPa.
  • the use of a high modulus metal can reduce failure of the bond between the material of the bearing surface and the metal.
  • metals which can be used for the body include cobalt chrome based alloys, titanium alloys, and certain stainless steels.
  • the metal from which at least one of the first and secondjoint components is made is an alloy which includes chromium as a component element. It is an advantage of the present invention that a ceramic coating can be applied to a metal prosthesis component which is formed from a chromium based alloy, with enhanced adhesive interactions between the coating and the alloy of the body. It is particularly preferred that the metal from which at least one of the first and secondjoint components is made is a cobalt chromium molybdenum alloy, in particular an alloy which satisfies ASTM F-l 537.
  • a prosthesis component formed from a chromium based alloy can be provided with a ceramic coating to increase wear resistance yet further, with strong adhesive interactions between the coating and the body. Furthermore, it appears that if, after use for a long period, the chromium based ceramic coating wears through and the alloy is exposed, the hard characteristics of the alloy mean that the component is not then subject to high wear rates as is the case for components in which the body is made from titanium.
  • Either of both of the components can be made in a plurality of parts which are formed from different materials.
  • the femoral component can comprise separable stem and head parts which are formed from different materials.
  • the bearing surface which articulates with a corresponding bearing surface on the acetabular component, and on which the ceramic coating is provided, will be on the head part.
  • the acetabular component of a hip joint prosthesis can comprise separable shell and liner parts which are formed from different materials.
  • the bearing surface which articulates with a corresponding bearing surface on the femoral component and on which the ceramic coating is provided will be on the liner part.
  • the surface roughness of the coatings, as measured using conventional surface profilometer apparatus, which are applied to the first and secondjoint components is not more than about 0.05 ⁇ m (R a ), more preferably not more than about 0.02 ⁇ m (R , especially not more than about 0.01 ⁇ m (RJ.
  • the surface roughness is not more than about 0.1 ⁇ m (R pm ), more preferably not more than about 0.04 ⁇ m (R pm ). It is an advantage of the use of ceramic materials in the joint prosthesis of the present invention that they can conveniently be finished with such smooth surface properties by readily accessible surface finishing techniques using conventional techniques and commercially available equipment.
  • the present invention can be implemented in joints such as a hip, knee, ankle and shoulder joints, as well as joints in fingers, toes, wrists and elbows.
  • the first component can comprise the head part of the femoral component
  • the second component can comprise the cup part of the acetabular component.
  • the first component can comprise the femoral component and the second component can comprise the tibial component (which might include a meniscus component which can be moved relative to the part that is implanted in the tibia).
  • the coating will only be applied to the body of the component in the region of the bearing surface which articulates with the bearing surface of the other component of the joint.
  • the coating is applied to the bearing surfaces by a vapour deposition technique. It is particularly preferred to use an evaporative physical vapour deposition technique.
  • a vapour deposition technique is particularly preferred.
  • An example of suitable deposition equipment is available from IonBond AG, of Olten, Switzerland, such as for example the cathodic arc coating system sold under the trade mark PVD-3344. This uses a water cooled stainless steel cylindrical chamber of diameter 84 cm and height 112 cm which contains nine 5.4 kW arc sources.
  • Parts are coated using an IonBond 3344 arc evaporative PVD coating system available from IonBond AG, Industriestrasse 211, CH-4601 Olten, Switzerland. Parts are prepared for coating by cleaning using widely available aqueous detergents and then drying using hot air.
  • the parts are mounted within the coating chamber on a fixture which allows the parts to be manipulated.
  • the fixture for convex components such as the head of a femoral component of a hip joint prosthesis allows double rotation planetary motion.
  • the fixture for concave components such as the cup of an acetabular component allows single rotation, with the mouth of the cup facing outwards towards the evaporation sources.
  • the minimum distance between the parts and the evaporation sources is 180 mm.
  • the coating chamber is evacuated to a typical starting pressure of 2 x 10 "5 mtorr.
  • a part to be coated is then conditioned using a glow discharge in a mixture of argon and hydrogen. This is followed by a short bombardment with ions of chromium released by the evaporation sources and accelerated by a negative voltage of about -1000 V applied to the part.
  • Deposition is undertaken at a chamber pressure of 48 mtorr of nitrogen gas (99.999% purity) with a negative voltage of about -300 V applied to the part.
  • the thickness of the coatings that are applied to the parts is at least 10 ⁇ m.
  • Parts were coated using the technique described above and tested for wear rates and ion concentrations.
  • the parts were femoral and acetabular components of a hip joint prosthesis, formed from a cobalt chrome molybdenum alloy.
  • the femoral components had a spherical head with a diameter of 28 mm.
  • the radial clearance between the bearing surface was 30 ⁇ m.
  • Each of the bearing surfaces was finished to a surface roughness R a of 0.02 ⁇ m.
  • Femoral and acetabular components of a hip joint prosthesis were prepared with ceramic coatings on the bearing surfaces of TiN, CrN and CrCN.
  • the parts were tested in a hip simulator (of the kind referred to in J Eng Med 215 H 119-121 (2000)) which reproduces loads and motions during a normal walking cycle.
  • Calf serum (25% (v/v)) was used to lubricate the bearing surfaces of the components during the tests. Wear volumes were determined by gravimetric analysis.
  • the levels of metal ions from the prosthesis component bodies were determined by atomic absorption spectroscopy.
  • the tests were performed with exposed (uncoated) metal bearing surfaces on both components, TiN coatings on the bearing surfaces of both components, CrN coatings on the bearing surfaces of both components, and CrCN coatings on the bearing surfaces of both components.
  • Figure 1 shows mean wear rates following wear tests using a hip joint simulator.
  • Figure 2 shows ion concentrations measured in joint serum lubricants following tests using the hip joint simulator.
  • the levels of wear and of ion concentration in the serum after two million walking cycles was significantly less for each of the coated samples than for the uncoated metal sample.
  • the volume of wear debris that was produced from the three sets of coated components (measured in mm 3 per million cycles) after two million cycles did not vary significantly, and was less than about 0.1 mmVmillion cycles in each case (compared with about 1.3 rnnrVmillion cycles for the uncoated metal control).
  • the CrN and CrCN coated components produced only small nanometre size particles, while the titanium nitride coated components produced both small nanometre size particles as well as larger shards consistent with the surface damage.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Chemical & Material Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Vascular Medicine (AREA)
  • Inorganic Chemistry (AREA)
  • Epidemiology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medicinal Chemistry (AREA)
  • Dermatology (AREA)
  • Prostheses (AREA)
  • Materials For Medical Uses (AREA)

Abstract

L'invention porte sur une prothèse articulaire orthopédique comprenant un premier et un second composant. Chacun de ces composant est formé dans un corps métallique et comporte une surface de support qui vient en contact avec la surface de support correspondante de l'autre composant lorsque la prothèse est implantée. Sur la surface de support de chaque corps métallique est appliqué un revêtement céramique, ce revêtement comprenant un composé de chrome et ayant au moins une épaisseur d'environ 5 νm. Les revêtements peuvent être différents de sorte que, par exemple, la différence entre la dureté des matériaux de revêtement appliqués sur les premier et second composants soit inférieure à environ 5000 MPa. De préférence, le métal dans lequel est conçu au moins un des premier et seconds composants a un module d'au moins environ 150 GPa.
EP20020749005 2001-07-06 2002-07-05 Protheses articulaires orthopediques Withdrawn EP1404257A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0116546 2001-07-06
GBGB0116546.3A GB0116546D0 (en) 2001-07-06 2001-07-06 An orthopaedic joint prosthesis
PCT/GB2002/003146 WO2003003950A1 (fr) 2001-07-06 2002-07-05 Protheses articulaires orthopediques

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EP1404257A1 true EP1404257A1 (fr) 2004-04-07

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JP (1) JP2004530526A (fr)
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CN (1) CN1523974A (fr)
CA (1) CA2451612A1 (fr)
GB (1) GB0116546D0 (fr)
WO (1) WO2003003950A1 (fr)
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EP2037976B1 (fr) * 2006-04-11 2019-11-20 Smith and Nephew, Inc. Composite céramique-métal pour implants orthopédiques
GB2459081A (en) 2008-01-31 2009-10-14 Tecvac Ltd Coated biomedical components
ATE528023T1 (de) 2008-12-30 2011-10-15 Sandvik Intellectual Property Konstruierte oberflächen zur verwendung in medizinischen implantaten oder instrumenten
KR101649746B1 (ko) * 2011-01-21 2016-08-23 한국과학기술연구원 인공 관절용 소재의 제조 방법
WO2015191956A1 (fr) 2014-06-13 2015-12-17 Acuitive Technologies, Inc. Dispositifs, systemes et procedes de remplacement articulaire ou de resurfacage articulaire
KR20180081427A (ko) * 2017-01-06 2018-07-16 고려대학교 산학협력단 인공 관절
EP3821854A1 (fr) * 2019-11-13 2021-05-19 Waldemar Link GmbH & Co. KG Composant d'implant revêtu de zirconium et son utilisation

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WO2011141169A1 (fr) 2010-05-11 2011-11-17 Medacta International S.A. Substrat pour articulations orthopédiques résistantes à l'usure, en un métal non ferreux avec un revêtement à base de nitrure

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ZA200400968B (en) 2005-02-07
CN1523974A (zh) 2004-08-25
JP2004530526A (ja) 2004-10-07
KR20040038976A (ko) 2004-05-08
WO2003003950A1 (fr) 2003-01-16
GB0116546D0 (en) 2001-08-29
CA2451612A1 (fr) 2003-01-16

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