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WO2008015290A1 - Metal sockets provided with a porous outer sheath for reducing socket deformations in press-fit situations - Google Patents

Metal sockets provided with a porous outer sheath for reducing socket deformations in press-fit situations Download PDF

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Publication number
WO2008015290A1
WO2008015290A1 PCT/EP2007/058129 EP2007058129W WO2008015290A1 WO 2008015290 A1 WO2008015290 A1 WO 2008015290A1 EP 2007058129 W EP2007058129 W EP 2007058129W WO 2008015290 A1 WO2008015290 A1 WO 2008015290A1
Authority
WO
WIPO (PCT)
Prior art keywords
porous outer
outer coating
metal
pelvic bone
cup
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.)
Ceased
Application number
PCT/EP2007/058129
Other languages
German (de)
French (fr)
Inventor
Roman Preuss
Dr. Thomas Pandorf
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.)
Ceramtec GmbH
Original Assignee
Ceramtec GmbH
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 Ceramtec GmbH filed Critical Ceramtec GmbH
Publication of WO2008015290A1 publication Critical patent/WO2008015290A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • A61F2/34—Acetabular cups
    • 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
    • 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
    • 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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • 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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • 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
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30011—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in porosity
    • 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
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30014—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
    • 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
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30561—Special structural features of bone or joint prostheses not otherwise provided for breakable or frangible
    • 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
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
    • A61F2002/30616—Sets comprising a plurality of prosthetic parts of different sizes or orientations
    • 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
    • A61F2002/3092—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth having an open-celled or open-pored structure
    • 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
    • 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
    • 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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • 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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/365—Connections of heads to necks
    • 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
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0018—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
    • 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
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0023—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in porosity
    • 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
    • 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

Definitions

  • the invention relates to a method for producing a metal cup which is implantable directly into the pelvic bone of a patient and is part of a hip joint prosthesis, with a permitted cup deformation by the elasticity of the pelvic bone in the loading state and the metal cups produced by this method.
  • the market has a variety of prosthetic systems for the replacement of the natural hip joint. These usually consist of a shaft 1 coupled to a ball head 2 and a metal pan 4 coupled with a pan insert 3. Shank 1 and metal pan 4 are connected to the body by ingrowth in the Oberschenkel construction.
  • the ball head 2 is rotatably mounted in the cup of the cup insert 3 - degree of freedom: 1 (see Figure 1).
  • Metal pans are coupled to the pelvic bone by various techniques during the primary fixation operation.
  • a common type of fixation is the clamping of the metal cup by means of pressfit. This represents a form of coupling which in the technical sense is attributable to the oversize connections, i. the external geometry of the metal cup is greater than the cup holder created by the doctor by milling out the acetabulum. The thus acting after the introduction of the pan from the pelvic bone on the pan normal forces and consequently frictional forces ensure the primary anchoring of the metal pan.
  • the deformation of the pan can lead to an increased risk of the formation of stripe-wear, which is a possible cause of the occurrence of the squeaking phenomenon.
  • the invention has for its object to improve a method according to the preamble of claim 1 so that asymmetric deformations of the metal pan are compensated by the elasticity of the pelvic bone in the load state. Furthermore, a metal pan is to be specified, which is produced by this method.
  • the metal pan is provided with a thick-walled, porous outer coating whose stiffness is adjusted so that the layer collapses in the load state when a voltage corresponding to the permitted pan deformation is exceeded.
  • asymmetrical deformations of the metal cup are compensated by the elasticity of the pelvic bone in the load state.
  • Collapse is understood to mean the collapse or breakage of the porous outer coating. This collapse takes place at the points of the porous outer coating, at which the permitted corresponding voltage is exceeded.
  • a pan deformation therefore means the deformation of the metal pan.
  • the porous outer coating is realized with a closed-pore structure, which collapses when the metal pan is inserted into the pelvic bone when the corresponding tension is exceeded. However, the fragments remain within the structure so that there is no inflammatory risk.
  • the porous outer coating is realized with an open-pore structure, which collapses during the introduction of the metal pan in the pelvic bone when the corresponding voltage is exceeded. This collapse is to be understood as a plastic deformation. There are no free fragments. The pelvic bone can grow into the remaining pores of the biocompatible material.
  • the porous outer coating can be realized with areas with a closed-pore structure and with areas with an open-pore structure.
  • the outer coating is produced in an inventive embodiment with a thickness of at least 0.1 mm, preferably with a thickness of at least 0.5 mm.
  • a metal cup according to the invention for direct implantation into the pelvic bone of a patient, as part of a hip joint prosthesis, produced in particular by the method described, is characterized in that the metal cup has a thick-walled, porous outer coating which has a closed-pore and / or open-pore structure.
  • the metal pan can compensate for asymmetrical deformations due to the elasticity of the pelvic bone in the loaded state.
  • the thickness of the porous outer coating is at least 0.1 mm, preferably at least 0.5 mm. - A -
  • FIG. 1 shows the state of the art.
  • a hip prosthesis usually consists of a shaft 1, the shaft head 7 is coupled to a ball head 2 and a metal pan 4 coupled with a pan insert 3.
  • Shank 1 and metal pan 4 are connected to the body of the patient by ingrowth in the femoral 20 and Connected pelvic bone 21 and are carriers for the ball head 2 and Pfannendon 3.
  • the ball head 2 is rotatably mounted in the calotte of the socket insert 3.
  • FIG. 2 shows a metal pan 4 according to the invention, which is provided with a thick-walled, porous outer coating 5. Their stiffness is adjusted so that the outer coating 5 collapses in the load state when a voltage corresponding to the permitted ladle deformation is exceeded.
  • the metal pan 4 shown in FIG. 2 has a porous outer coating 5 with a closed-pored structure which collapses when the metal pan 4 is inserted into the pelvic bone 21 when the corresponding voltage is exceeded.
  • FIG. 3 likewise shows a metal pan 4 according to the invention, which is provided with a thick-walled, porous outer coating 5. Their stiffness is adjusted so that the outer coating 5 collapses in the load state when a voltage corresponding to the permitted ladle deformation is exceeded.
  • the metal pan 4 shown in Figure 3 has a porous outer coating 5 with an open-pore structure, which collapses during insertion of the metal pan 4 in the pelvic bone 21 when the corresponding voltage is exceeded.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

The invention relates to a process for producing a metal socket (4) which can be implanted directly in the pelvis of a patient and forms part of a hip prosthesis, with a permitted socket deformation resulting from the elasticity of the pelvis in the loaded state. To enable asymmetric deformations of the metal socket to be compensated for by the elasticity of the pelvis in the loaded state, the invention proposes that the metal socket (4) be provided with a thick-walled, porous outer coating (5), the rigidity of which is set in such a way that the layer collapses in the loaded state if a stress which matches the permitted socket deformation is exceeded.

Description

MIT PORÖSER AUSSENHÜLLE VERSEHENE METALLPFANNE ZUR VERRINGERUNG DER PFANNENDEFORMATION IN PRESSFIT-SITUATIONEN POROUS OUTER PLASTER METAL PAN TO REDUCE THE POWDER INFORMATION IN PRESSFIT SITUATIONS

Die Erfindung betrifft ein Verfahren zur Herstellung einer Metallpfanne, die direkt in den Beckenknochen eines Patienten implantierbar ist und Teil einer Hüftgelenkprothese ist, mit einer erlaubten Pfannendeformation durch die Elastizität des Beckenknochens im Belastungszustand und die mit diesem Verfahren hergestellten Metallpfannen.The invention relates to a method for producing a metal cup which is implantable directly into the pelvic bone of a patient and is part of a hip joint prosthesis, with a permitted cup deformation by the elasticity of the pelvic bone in the loading state and the metal cups produced by this method.

Im Markt existiert eine Vielzahl von Prothesen-Systemen zum Ersatz des natürlichen Hüftgelenkes. Diese bestehen in der Regel aus einem Schaft 1 gekoppelt mit einem Kugelkopf 2 und einer Metallpfanne 4 gekoppelt mit einem Pfanneneinsatz 3. Schaft 1 und Metallpfanne 4 sind mit dem Körper durch Einwachsen in den Oberschenkelbzw. Beckenknochen verbunden und sind Träger für den Kugelkopf 2 bzw. Pfanneneinsatz 3. Der Kugelkopf 2 ist in der Kalotte des Pfanneneinsatzes 3 drehbar gelagert - Freiheitsgrad: 1 (siehe Figur 1).The market has a variety of prosthetic systems for the replacement of the natural hip joint. These usually consist of a shaft 1 coupled to a ball head 2 and a metal pan 4 coupled with a pan insert 3. Shank 1 and metal pan 4 are connected to the body by ingrowth in the Oberschenkelbzw. The ball head 2 is rotatably mounted in the cup of the cup insert 3 - degree of freedom: 1 (see Figure 1).

Metallpfannen werden im Lauf der Operation zur primären Fixierung durch verschiedene Techniken mit dem Beckenknochen gekoppelt. Eine verbreitete Fixierungsart ist das Klemmen der Metallpfanne mittels Pressfit. Dies stellt eine Form der Kopplung dar, welche im technischen Sinn den Übermaßverbindungen zuzuordnen ist, d.h. die Außengeometrie der Metallpfanne ist größer als die vom Arzt durch Ausfräsen des Acetabulums geschaffene Pfannenaufnahme. Die so nach dem Einbringen der Pfanne vom Beckenknochen auf die Pfanne wirkenden Normalkräfte und infolgedessen Reibkräfte stellen die primäre Verankerung der Metallpfanne sicher.Metal pans are coupled to the pelvic bone by various techniques during the primary fixation operation. A common type of fixation is the clamping of the metal cup by means of pressfit. This represents a form of coupling which in the technical sense is attributable to the oversize connections, i. the external geometry of the metal cup is greater than the cup holder created by the doctor by milling out the acetabulum. The thus acting after the introduction of the pan from the pelvic bone on the pan normal forces and consequently frictional forces ensure the primary anchoring of the metal pan.

Aufgrund der inhomogenen Eigenschaften des Beckenknochens erfolgt in der Regel eine asymmetrische Belastung der Metallpfanne in der Pressfit-Situation, welche eine asymmetrische Verformung der Metallpfanne zur Folge haben kann. Dies ist prinzipiell unerwünscht, da die asymmetrische Verformung der Metallpfanne das Einbringen der Pfanneneinsätze erschwert bzw. im weiteren Verlauf zur asymmetrischen Belastung und Verformung der Pfanneneinsätze führen kann. Mögliche weitere Auswirkungen sind dann Beschädigungen des Pfanneneinsatzes und/oder Ein- schränkung der Funktion der Gleitpaarung durch lokale Verringerung des Kalottendurchmessers des Pfanneneinsatzes.Due to the inhomogeneous properties of the pelvic bone, asymmetric loading of the metal cup in the press fit situation usually occurs, which can result in asymmetric deformation of the metal cup. This is in principle undesirable because the asymmetric deformation of the metal pan complicates the introduction of the cup inserts or can lead to asymmetric loading and deformation of the cup inserts in the further course. Possible further effects are then damage to the socket insert and / or limitation of the function of the sliding mating by local reduction of the calotte diameter of the socket insert.

Weiterhin kann die Deformation der Pfanne zu einer erhöhten Gefahr der Ausbildung von Stripe-Wear führen, was eine mögliche Ursache für das Auftreten des Quietschphänomens darstellt.Furthermore, the deformation of the pan can lead to an increased risk of the formation of stripe-wear, which is a possible cause of the occurrence of the squeaking phenomenon.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren nach dem Oberbegriff des Anspruchs 1 so zu verbessern, dass asymmetrische Verformungen der Metallpfanne durch die Elastizität des Beckenknochens im Belastungszustand kompensiert werden. Ferner soll eine Metallpfanne angegeben werden, welche nach diesem Verfahren hergestellt ist.The invention has for its object to improve a method according to the preamble of claim 1 so that asymmetric deformations of the metal pan are compensated by the elasticity of the pelvic bone in the load state. Furthermore, a metal pan is to be specified, which is produced by this method.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die Metallpfanne mit einer dickwandigen, porösen Außenbeschichtung versehen wird, deren Steifigkeit so eingestellt wird, dass die Schicht im Belastungszustand kollabiert, wenn eine der erlaubten Pfannendeformation entsprechende Spannung überschritten wird. Hierdurch werden asymmetrische Verformungen der Metallpfanne durch die Elastizität des Beckenknochens im Belastungszustand kompensiert. Unter Kollabieren wird das Zusammenfallen oder das Brechen bzw. Einbrechen der porösen Außenbeschichtung verstanden. Dieses Kollabieren erfolgt an den Stellen der porösen Außenbeschichtung, an denen die erlaubte entsprechende Spannung überschritten wird. Unter Pfanne wird in dieser Beschreibung immer die Metallpfanne verstanden. Eine Pfannendeformation bedeutet daher die Deformation der Metallpfanne.According to the invention this object is achieved in that the metal pan is provided with a thick-walled, porous outer coating whose stiffness is adjusted so that the layer collapses in the load state when a voltage corresponding to the permitted pan deformation is exceeded. As a result, asymmetrical deformations of the metal cup are compensated by the elasticity of the pelvic bone in the load state. Collapse is understood to mean the collapse or breakage of the porous outer coating. This collapse takes place at the points of the porous outer coating, at which the permitted corresponding voltage is exceeded. Under pan is always understood in this description, the metal pan. A pan deformation therefore means the deformation of the metal pan.

Das Kollabieren kann durch zwei Mechanismen erreicht werden, welche nachfolgend vorgestellt werden. Nach einer ersten erfindungsgemäßen Ausgestaltung wird die poröse Außenbe- schichtung mit einer geschlossenporigen Struktur realisiert, die während des Einbringens der Metallpfanne in den Beckenknochen bei Überschreiten der entsprechenden Spannung kollabiert. Die Bruchstücke verbleiben aber innerhalb der Struk- tur, so dass kein entzündliches Risiko besteht.The collapse can be achieved by two mechanisms, which are presented below. According to a first embodiment of the invention, the porous outer coating is realized with a closed-pore structure, which collapses when the metal pan is inserted into the pelvic bone when the corresponding tension is exceeded. However, the fragments remain within the structure so that there is no inflammatory risk.

Nach einer zweiten erfindungsgemäßen Ausgestaltung wird die poröse Außenbe- schichtung mit einer offenporigen Struktur realisiert, die während des Einbringens der Metallpfanne in den Beckenknochen bei Überschreiten der entsprechenden Spannung kollabiert. Dieses Kollabieren ist als plastische Deformation zu verstehen. Es entstehen keine freien Bruchstücke. Der Beckenknochen kann in die verbleibenden Poren des biokompatiblen Materials einwachsen.According to a second embodiment of the invention, the porous outer coating is realized with an open-pore structure, which collapses during the introduction of the metal pan in the pelvic bone when the corresponding voltage is exceeded. This collapse is to be understood as a plastic deformation. There are no free fragments. The pelvic bone can grow into the remaining pores of the biocompatible material.

Die poröse Außenbeschichtung kann mit Bereichen mit einer geschlossenporigen und mit Bereichen mit einer offenporigen Struktur realisiert werden.The porous outer coating can be realized with areas with a closed-pore structure and with areas with an open-pore structure.

Die Außenbeschichtung wird in einer erfinderischen Ausgestaltung mit einer Dicke von mindestens 0,1 mm, bevorzugt mit einer Dicke von mindestens 0,5 mm hergestellt.The outer coating is produced in an inventive embodiment with a thickness of at least 0.1 mm, preferably with a thickness of at least 0.5 mm.

Eine erfindungsgemäße Metallpfanne zur direkten Implantation in den Beckenknochen eines Patienten, als Teil einer Hüftgelenkprothese, hergestellt insbesondere mit dem beschriebenen Verfahren, ist dadurch gekennzeichnet, dass die Metall- pfanne eine dickwandige, poröse Außenbeschichtung aufweist, die eine geschlossenporige und/oder offenporige Struktur aufweist. Hierdurch kann die Metallpfanne asymmetrische Verformungen durch die Elastizität des Beckenknochens im Belastungszustand kompensieren.A metal cup according to the invention for direct implantation into the pelvic bone of a patient, as part of a hip joint prosthesis, produced in particular by the method described, is characterized in that the metal cup has a thick-walled, porous outer coating which has a closed-pore and / or open-pore structure. As a result, the metal pan can compensate for asymmetrical deformations due to the elasticity of the pelvic bone in the loaded state.

In einer erfinderischen Ausgestaltung beträgt die Dicke der porösen Außenbe- Schichtung mindestens 0,1 mm, bevorzugt mindestens 0,5 mm. - A -In an inventive embodiment, the thickness of the porous outer coating is at least 0.1 mm, preferably at least 0.5 mm. - A -

Nachfolgend werden der Stand der Technik und die Erfindung anhand von Figuren näher erläutert.Hereinafter, the prior art and the invention will be explained in more detail with reference to figures.

Figur 1 zeigt den Stand der Technik. Eine Hüftprothese besteht in der Regel aus einem Schaft 1 , dessen Schaftkopf 7 mit einem Kugelkopf 2 gekoppelt ist und einer Metallpfanne 4 gekoppelt mit einem Pfanneneinsatz 3. Schaft 1 und Metallpfanne 4 sind mit dem Körper des Patienten durch Einwachsen in den Oberschenkel- 20 bzw. Beckenknochen 21 verbunden und sind Träger für den Kugelkopf 2 bzw. Pfanneneinsatz 3. Der Kugelkopf 2 ist in der Kalotte des Pfanneneinsatzes 3 drehbar gelagert.FIG. 1 shows the state of the art. A hip prosthesis usually consists of a shaft 1, the shaft head 7 is coupled to a ball head 2 and a metal pan 4 coupled with a pan insert 3. Shank 1 and metal pan 4 are connected to the body of the patient by ingrowth in the femoral 20 and Connected pelvic bone 21 and are carriers for the ball head 2 and Pfanneneinsatz 3. The ball head 2 is rotatably mounted in the calotte of the socket insert 3.

Figur 2 zeigt eine erfindungsgemäße Metallpfanne 4, die mit einer dickwandigen, porösen Außenbeschichtung 5 versehen ist. Deren Steifigkeit ist so eingestellt, dass die Außenbeschichtung 5 im Belastungszustand kollabiert, wenn eine der erlaubten Pfannendeformation entsprechende Spannung überschritten wird. Die in Figur 2 dargestellte Metallpfanne 4 weist eine poröse Außenbeschichtung 5 mit einer ge- schlossenporigen Struktur auf, die während des Einbringens der Metallpfanne 4 in den Beckenknochen 21 bei Überschreiten der entsprechenden Spannung kollabiert.FIG. 2 shows a metal pan 4 according to the invention, which is provided with a thick-walled, porous outer coating 5. Their stiffness is adjusted so that the outer coating 5 collapses in the load state when a voltage corresponding to the permitted ladle deformation is exceeded. The metal pan 4 shown in FIG. 2 has a porous outer coating 5 with a closed-pored structure which collapses when the metal pan 4 is inserted into the pelvic bone 21 when the corresponding voltage is exceeded.

Figur 3 zeigt ebenfalls eine erfindungsgemäße Metallpfanne 4, die mit einer dickwandigen, porösen Außenbeschichtung 5 versehen ist. Deren Steifigkeit ist so eingestellt, dass die Außenbeschichtung 5 im Belastungszustand kollabiert, wenn eine der erlaubten Pfannendeformation entsprechende Spannung überschritten wird. Die in Figur 3 dargestellte Metallpfanne 4 weist eine poröse Außenbeschichtung 5 mit einer offenporigen Struktur auf, die während des Einbringens der Metallpfanne 4 in den Beckenknochen 21 bei Überschreiten der entsprechenden Spannung kollabiert. FIG. 3 likewise shows a metal pan 4 according to the invention, which is provided with a thick-walled, porous outer coating 5. Their stiffness is adjusted so that the outer coating 5 collapses in the load state when a voltage corresponding to the permitted ladle deformation is exceeded. The metal pan 4 shown in Figure 3 has a porous outer coating 5 with an open-pore structure, which collapses during insertion of the metal pan 4 in the pelvic bone 21 when the corresponding voltage is exceeded.

Claims

Patentansprüche claims 1 . Verfahren zur Herstellung einer Metallpfanne (4), die direkt in den Beckenknochen (21 ) eines Patienten implantierbar ist und Teil einer Hüftgelenkprothese ist, mit einer erlaubten Pfannendeformation durch die Elastizität des Beckenkno- chens (21 ) im Belastungszustand, dadurch gekennzeichnet, dass die Metallpfanne (4) mit einer dickwandigen, porösen Außenbeschichtung (5) versehen wird, deren Steifigkeit so eingestellt wird, dass die Schicht im Belastungszustand kollabiert, wenn eine der erlaubten Pfannendeformation entsprechende Spannung überschritten wird.1 . Method for producing a metal cup (4), which is implantable directly into the pelvic bone (21) of a patient and is part of a hip joint prosthesis, with a permitted cup deformation by the elasticity of the pelvic bone (21) in the loaded state, characterized in that the metal cup (4) is provided with a thick-walled, porous outer coating (5), the stiffness of which is adjusted so that the layer collapses under load condition when a tension corresponding to the permitted cup deformation is exceeded. 2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die poröse Außenbeschichtung (5) mit einer geschlossenporigen Struktur realisiert wird, die während des Einbringens der Metallpfanne (4) in den Beckenknochen (21 ) bei Überschreiten der entsprechenden Spannung kollabiert.2. The method according to claim 1, characterized in that the porous outer coating (5) is realized with a closed-pore structure, which collapses during the introduction of the metal pan (4) in the pelvic bone (21) when the corresponding voltage is exceeded. 3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die poröse Außen- beschichtung (5) mit einer offenporigen Struktur realisiert wird, die während des3. The method according to claim 1, characterized in that the porous outer coating (5) is realized with an open-pore structure, which during the Einbringens der Metallpfanne (4) in den Beckenknochen (21 ) bei Überschreiten der entsprechenden Spannung kollabiert.Introducing the metal pan (4) in the pelvic bone (21) collapsed when the corresponding voltage is exceeded. 4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die poröse Außenbeschichtung (5) mit Bereichen mit einer geschlossenporigen und Berei- chen mit einer offenporigen Struktur realisiert wird.4. The method according to claim 2 or 3, characterized in that the porous outer coating (5) is realized with areas with a closed-pore and areas with an open-pored structure. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Außenbeschichtung (5) mit einer Dicke von mindestens 0,1 mm, bevorzugt mit einer Dicke von mindestens 0,5 mm hergestellt wird.5. The method according to any one of claims 1 to 4, characterized in that the outer coating (5) is made with a thickness of at least 0.1 mm, preferably with a thickness of at least 0.5 mm. 6. Metallpfanne zur direkten Implantation in den Beckenknochen eines Patienten, als Teil einer Hüftgelenkprothese, hergestellt insbesondere mit einem Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Metallpfanne (4) eine dickwandige, poröse Außenbeschichtung (5) aufweist, die eine geschlossenporige und/oder offenporige Struktur aufweist.6. Metal cup for direct implantation in the pelvic bone of a patient, as part of a hip joint prosthesis, manufactured in particular with a method according to one of claims 1 to 5, characterized in that the metal pan (4) has a thick-walled, porous outer coating (5), which has a closed-cell and / or open-pored structure. 7. Metallpfanne nach Anspruch 6, dadurch gekennzeichnet, dass die Dicke der porösen Außenbeschichtung (5) mindestens 0,1 mm, bevorzugt mindestens 0,5 mm beträgt. 7. Metal pan according to claim 6, characterized in that the thickness of the porous outer coating (5) is at least 0.1 mm, preferably at least 0.5 mm.
PCT/EP2007/058129 2006-08-04 2007-08-06 Metal sockets provided with a porous outer sheath for reducing socket deformations in press-fit situations Ceased WO2008015290A1 (en)

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DE102006036878 2006-08-04
DE102007031670.6 2007-07-06
DE102007031670.6A DE102007031670B4 (en) 2006-08-04 2007-07-06 Porous outer shell of metal cups to reduce cup deformations in Pressfit situations

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Publication number Priority date Publication date Assignee Title
EP4056152A1 (en) 2020-11-12 2022-09-14 Common Sense Engineering and Consult B.V. Acetabular implant and method for deforming this implant
US12144736B2 (en) 2020-11-12 2024-11-19 Common Sense Engineering And Consult B.V. Acetabular implant and method for deforming this implant

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