CA2482875C - Junction for a modular implant - Google Patents
Junction for a modular implant Download PDFInfo
- Publication number
- CA2482875C CA2482875C CA2482875A CA2482875A CA2482875C CA 2482875 C CA2482875 C CA 2482875C CA 2482875 A CA2482875 A CA 2482875A CA 2482875 A CA2482875 A CA 2482875A CA 2482875 C CA2482875 C CA 2482875C
- Authority
- CA
- Canada
- Prior art keywords
- bore
- male
- implant
- junction
- female
- 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.)
- Active
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Classifications
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- 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
- A61F2/367—Proximal or metaphyseal parts of 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
- 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
- A61F2/32—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
- A61F2/34—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
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
-
- 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
- A61F2/3662—Femoral shafts
- A61F2/3676—Distal or diaphyseal parts of 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
- A61F2002/30014—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
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- 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
- 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
- A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
- A61F2002/30324—The prosthesis having different structural features at different locations within the same prosthesis differing in thickness
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- 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
- 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
- A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
- A61F2002/30326—The prosthesis having different structural features at different locations within the same prosthesis differing in height or in length
-
- 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
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
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- 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
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
- A61F2002/30339—Double cones, i.e. connecting element having two conical connections, one at each of its opposite ends
-
- 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
- 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
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
- A61F2002/30349—Conically- or frustoconically-shaped protrusion and recess the male and female complementary cones being of different conicities, i.e. for reducing the contact area
-
- 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
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- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30354—Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
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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
- 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
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
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- 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
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- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
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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
- 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
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
- A61F2002/30507—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
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- 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
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- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
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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
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- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
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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
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
- A61F2002/30886—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts externally-threaded
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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
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- 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
- 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
- A61F2/3672—Intermediate parts of shafts
- A61F2002/3674—Connections of proximal parts to distal parts
-
- 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
- A61F2002/3678—Geometrical features
- A61F2002/3694—Geometrical features with longitudinal bores
-
- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
-
- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
-
- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
-
- 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
- A61F2250/0036—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 thickness
-
- 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
- A61F2250/0037—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 height or in length
Abstract
A modular joint implant including a male/female junction comprises two components. A bore in the first component has an opening. An interior surface forms a female side. A projection in the second component has an exterior surface forming a male side. A portion of contact area between bore and projection is adjacent the opening and is offset axially relative to a second portion. A modular hip joint implant including a male/female junction comprises a proximal body. A projection adjacent the first end of a stem component has an exterior surface forming a male side of the junction.
The projection engages with a bore along the junction axis. The male and female sides contact one another adjacent a bore opening. A portion of the bore opening adjacent the lateral aspect is offset axially toward the top end relative to a portion of the bore opening adjacent the medial aspect.
The projection engages with a bore along the junction axis. The male and female sides contact one another adjacent a bore opening. A portion of the bore opening adjacent the lateral aspect is offset axially toward the top end relative to a portion of the bore opening adjacent the medial aspect.
Description
~~~~°zr~ ~ ~z~u~,~. rv~~~.~o~
~~~~1~~
[00~ l j Medical implants to replace or augment various part:; of the marnnaalian body have been successfully used to reduce pain sand improve function. f or example, orthopaedic implants for replacing portions cf bones a_nd joints damaged by disease andlor trau.a often eliminate pain and/or increasc mobilit;~. orthopaedic implants for hips, Knees, shoulders, ankles, elbows, wrists, the digits of the; hands and feet, vertebral bodies, spinal discs, and other bones and joints have beer-, deve~oped. Many medical ixnplarats are made more versatile by providing them as separate modular compon~;nts that can be cor~abined to form aru implant suited to a particular patient's condition. there such nodular corr~ponents are supplied, a means for attaching them to one another is provided.
~~JMM~fL~
[O~O~j ~'he present invention provides a junction for modular i~.plant components.
[Q(3t~3j ~n one aspect of the invention, a modulav joint impla.t incl,~des a male/ferraale junction between first and second joint components. '~'he fi:rst component includes a bore having a longitudinal junction? axis and a bore opening. 'uhf: second component includes a projection engageable with the bore ire malelfemale seating arra:~gement. l-~.
first portion of the bore opening is offset axiallay relative to a second portion of the bore opening.
[O~d4j ~n another aspect of the :invention, the first portion is offset in a direction of increasing stiffness of the wall surrounding the bore.
[0005] In another aspect of the invention, the first portion is offset in a direction of increasing wall thiclaiess.
[0006] In another aspect of the invention, the first portion is offset on a side of the implant that is generally in tension when the implant is loaded.
j0007] In another aspect of the invention, a modular joint implant includes a male/female junetion having a side that is predominately in compression i.n use and a side that is predominately in tension in use. The implant includes a first: component including a bore having a bore opening and an interior surface forming a female side of the male/female junction. The first componen~ further has an exterior surfacE;. Tlhe interior and exterior surfaces define a wall between tuern having a wall thickness. The wall thickness on the tensile side of the implant being greater than the wall thickness on K~he compressive side of the implant.
[OOfl~] In another aspect of the invention, a modular joint implant includes a male/female junction having a side that is predorr~inately in compression in use and a side that is predominately in tension in use. The implant includes a f rst component including a bore having a bore opening and an interior surface farming a female side of the male/female junction. The bore has a side on the tensile side of the implant that is shifted axially relative to a side of the bore on the compressive side of the implant.
[0009] These and other aspects of the invention will be described in reference to the appended drawings.
~~~~1~~
[00~ l j Medical implants to replace or augment various part:; of the marnnaalian body have been successfully used to reduce pain sand improve function. f or example, orthopaedic implants for replacing portions cf bones a_nd joints damaged by disease andlor trau.a often eliminate pain and/or increasc mobilit;~. orthopaedic implants for hips, Knees, shoulders, ankles, elbows, wrists, the digits of the; hands and feet, vertebral bodies, spinal discs, and other bones and joints have beer-, deve~oped. Many medical ixnplarats are made more versatile by providing them as separate modular compon~;nts that can be cor~abined to form aru implant suited to a particular patient's condition. there such nodular corr~ponents are supplied, a means for attaching them to one another is provided.
~~JMM~fL~
[O~O~j ~'he present invention provides a junction for modular i~.plant components.
[Q(3t~3j ~n one aspect of the invention, a modulav joint impla.t incl,~des a male/ferraale junction between first and second joint components. '~'he fi:rst component includes a bore having a longitudinal junction? axis and a bore opening. 'uhf: second component includes a projection engageable with the bore ire malelfemale seating arra:~gement. l-~.
first portion of the bore opening is offset axiallay relative to a second portion of the bore opening.
[O~d4j ~n another aspect of the :invention, the first portion is offset in a direction of increasing stiffness of the wall surrounding the bore.
[0005] In another aspect of the invention, the first portion is offset in a direction of increasing wall thiclaiess.
[0006] In another aspect of the invention, the first portion is offset on a side of the implant that is generally in tension when the implant is loaded.
j0007] In another aspect of the invention, a modular joint implant includes a male/female junetion having a side that is predominately in compression i.n use and a side that is predominately in tension in use. The implant includes a first: component including a bore having a bore opening and an interior surface forming a female side of the male/female junction. The first componen~ further has an exterior surfacE;. Tlhe interior and exterior surfaces define a wall between tuern having a wall thickness. The wall thickness on the tensile side of the implant being greater than the wall thickness on K~he compressive side of the implant.
[OOfl~] In another aspect of the invention, a modular joint implant includes a male/female junction having a side that is predorr~inately in compression in use and a side that is predominately in tension in use. The implant includes a f rst component including a bore having a bore opening and an interior surface farming a female side of the male/female junction. The bore has a side on the tensile side of the implant that is shifted axially relative to a side of the bore on the compressive side of the implant.
[0009] These and other aspects of the invention will be described in reference to the appended drawings.
ERIEI? DES~I~IPTIC)N flF iFIE .~I~~~NI~NGS
[00l Oj Various embodiments of i.he present invention will be discussed with reference to the appended drawings. These drav~~ings depict only illustrative embodiments of the invention and are not to be considered limiting of its scope.
[0011 j FIG. 1 is an exploded perspective view of a modular implant junction according to the present invention;
[00I 2j FIG. 2 is a side section view of the modular implant junction of FIG.
I ; and [0013] FIG. 3 1S a Slde section view of an opt~Onal contigura.~:ior~ of the lateral side ofthe modular implant junction of the present invention.
DESCRIPTIGIV C3F Tr~-IE II,LUSTI'cA T ED E~IBO:DIt~IEI~1TS
[00I4j Embodiments of a juzlction for a modular implant are aphlic;able to a variety of implants for use throughout the Body. A femoral hip stem leas been used to illustrate the invention. FIowever, the invention may also be applied to various other implants including orthopaedic implants for hips, knees, shoulders, ankles,-elbows, wrists, the digits of the hands and feet, vertebral bodies, spinal discs, and other suitable implants.
[0015] FIGS 1~2-depict a modular femoral hip implant IO jar re~alacing the proximal head and neck of a femur of a hip joint that has been damaged due to injury or disease. In use, the proximal head and neck are surgically removed and the femoral hip implant IO
is inserted into fhe proximal femur. The fernorai hip implant ~l 0 supports a femoral head 12 that may be a modular and separate cornpor,ent as shown. Optionally, the femoral head I2 may be integral to tile femoral hip implant I0. ~n acetabular component 4 may be implanted in the acetabulum of the pelvis to articulate with. the femoral head I2. Optionally, the femoral head I2 may articulate with the natural. acetabulum. The femoral hip implant 10 has a medial aspect I6 and a lateral aspect I 8. V~hen the paticdnt loads the: joint, such as by standing, walking, or other activities, forces are transmittedto tl~e femoral hip implant 10 through the head 12. These forces tend to crenate a'bending moment that ,places the medial aspect 16 of the femoral hip implant in compression and the lateral aspect ~ 8 in l:ension.
BOO I6j The femoral hip implant I ~ rna~r include ;modular components such as a proximal body 20 and a stem 22. The proximal body 2~ has a top end 24 ana. a bottom end 26. A neck 28 extends upwardly and medially from the flop e:nd 24 to su=pport the femoral head 12 for articulation with the acetabular component 14. The proximal body 20 and stem 22 ynclude a male/female junction for hold:~n~; them together. In then illustrative embodiment, the female side of the junction is depicted in the proximal;body 2~ and tl~e male side of the junction is depicted on the stem 22. It is conte=mplated that the male/fernale portions may be reversed and still fall within the scope of the invention. The proximal bady 20 includes a bore 30 FIG. 2~ having a bore opening 32 and an interior surface 34 forming the female side of the male/female junction. The bore 3~ has a longitudinal junction axis, 36, The proximal body 20 has an exterior surface 38 spaced h-om the interior surface 34 of the bore 3D. The exterior 38 and inte;ri.or 34 surfaces define a will 40 between them. The wala 40 has-a wall thickness 42 that may be constant or that may increase from the bore opening 32 toward the top end 24 as shown in FIG. 2. An increasing wall thickness xnay be ac;cornpli.shed by tapering the bore such that it narrows from the bore opening 32 toward the top end 24 as ir°f the illustrative embodiment. A tapered bore c'cn be made self locking as i s k~~ovan in the art.
~OOI7j The; stem 22 includes a bottom end 44 and a top end 46. The bottom end 44 is configured for insertion into the intra.~nedullary canal of the patier..t's femur. The top end 46 includes a projection 48 having an exterior surface ~0 forming the ra~ale side of the rnale/female junction. The projection 48 is engageable v~rith the bore 30 in male/female seating arrangement along the ju;.ZCtion axis 36. A tl~xeaded stud 33 extends froir~ the projection 4~ and is received by :a counter bore 35 formed in t'~e :proximal body 20. .~. nut 37 threads onto the stud 33 to secure; the male/female junction.
[001 ~j When the femoral hip implant 10 is loaded, the medi~.1 aspects of the proximal body 20 and stem 22 are placed in compression and the lateral aspects of the proximal body 20 and stem 22 are placed in tension. l3ue to differences in the bending stiffness of the proximal body 20 and stern 22 in the regicyn of the male/female junction, the bore wall ~.0 may move relative to the exterior surface 50 of the projection 48, ~ycl:ic loading can lead to fretting between the interior surface 3~ c~fthe bore 30 arx.d exterior surface a>0 of the projection ~8.
'This may be mo~°e problematic on the tension side since tensile, f~rces may initiate and propagate fatigue cracks.
X0019] The magnitude of the fretting motion is related to the relative stiffness of the male and female parts of the junction. The relative motion at the opening 32 of the bore 30 is an accumulation of the relative rrr~ot~ion along the entire length of the j unction. T his accumulated relative motion may be decreased by decreasing the length along which the relative motion accumulates on the tensile side of the junction., However, it: is ineffective to simply make the junction shorter, because this w.ll create higher stresses on ~tl~e smaller diameter male cross sectiowwhere such a shortened junction would end. However, by shortening only the tensile;
side, the compressive side is still supported and the tensile ;9tres,s at the end of the tensile side increases only slightly while the; relative fretting motion decreases signiircantly. In the illustrative embodiment, a Lateral portion 52 of the bore opening 3 ~ is offset axially upwardly relative to a medial portion 54. This offset, or relieved, portion 52 can be created by stepping up the lateral portion 52, slopia~g up the lateral side such that the bore opening 32 is transverse to the junction axis 3~, or by forming the bore opening in some other suitable shape.
[0020] Fretting in the male/fe~~nale junction can also be reduced by better matching the stiffness of the male and female :~idcs of the male/female junction. T he present investigators have found that one way to better match the stiffness of the male a~a.d female sides is to increase the stiffness of the bore wall ~0 adjacent the bore opening 32 on the tensile side of the implant 10. Increasing the stiffness can be accomplished by in~~reasing the outer diameter of the proximal bode 20 adjacent the bore opening 32 to move material radially away from. the junction axis 3~ such that the bending moment of inertia is increased.
Increasing this stiffness can also be accomplished by increasing the wall thickness of the proximal body 20 at the junction of the proxianaa body 20 arid projE;ction 48.
In the illustrative embodiment, the bore 30 is tapered so that it nart°ows proximally and the wall thickness 42 increases proximally. Icy offsetting a lateral portion.~2 of the bore opening 32 axially upwardly relative to a medial L3ortion 54 the wall thickness on the lateral side 18 of the bore opening 32 is increased. This offset, or relieved, portion 52 can be created by sloping the lateral side such that the bare opening 32 is transverse t:o the junction axis 36 as shown, by stepping up the lateral portion 52; or-by forming the bore opening in some other suitable shape. In the illustrative embodiment, the projectic~~z 48 farming the male side of thf;
junction narrows upwardly. Thy2s, arzoving the lateral portion 52 u~~wardly also moves the lateral interface to an area of decreased stiffness of the proj ection 48 to fvzrther match the stiffness of the male and female portir~ns laterally. Finally, by mowing the lateral side upwardly while having the medial, anterior, and posterior sides c~ftr~e junction extend further downwardly, the fatigue properti°s of tl~e lateral side are irnp~~~o~,red while the overall interface of the male and female parts is kept relatively large to facilitate sec~2-re engagement between them.
[0021] Another way increase the stiffness of the bore wall 41~ is to enlarge the bore 30 on just the tensile side of the junction as showy in FIO. 3 such that tlm bore wall is offset away from the projection ~~. This has the same effect as moving the tensile side axially upwardly as described above. Other ways of better matching the stiffness of the male and female sides of the junction may also be used end are considered within the scope of this invention.
j0022j It will be understood by those spilled in the art that tl~e foregoing has described illustrative embodiments of the present invention and that variations may be made to these embodiments without departing from the spirit and scope of the invention defined by the appended claims.
[00l Oj Various embodiments of i.he present invention will be discussed with reference to the appended drawings. These drav~~ings depict only illustrative embodiments of the invention and are not to be considered limiting of its scope.
[0011 j FIG. 1 is an exploded perspective view of a modular implant junction according to the present invention;
[00I 2j FIG. 2 is a side section view of the modular implant junction of FIG.
I ; and [0013] FIG. 3 1S a Slde section view of an opt~Onal contigura.~:ior~ of the lateral side ofthe modular implant junction of the present invention.
DESCRIPTIGIV C3F Tr~-IE II,LUSTI'cA T ED E~IBO:DIt~IEI~1TS
[00I4j Embodiments of a juzlction for a modular implant are aphlic;able to a variety of implants for use throughout the Body. A femoral hip stem leas been used to illustrate the invention. FIowever, the invention may also be applied to various other implants including orthopaedic implants for hips, knees, shoulders, ankles,-elbows, wrists, the digits of the hands and feet, vertebral bodies, spinal discs, and other suitable implants.
[0015] FIGS 1~2-depict a modular femoral hip implant IO jar re~alacing the proximal head and neck of a femur of a hip joint that has been damaged due to injury or disease. In use, the proximal head and neck are surgically removed and the femoral hip implant IO
is inserted into fhe proximal femur. The fernorai hip implant ~l 0 supports a femoral head 12 that may be a modular and separate cornpor,ent as shown. Optionally, the femoral head I2 may be integral to tile femoral hip implant I0. ~n acetabular component 4 may be implanted in the acetabulum of the pelvis to articulate with. the femoral head I2. Optionally, the femoral head I2 may articulate with the natural. acetabulum. The femoral hip implant 10 has a medial aspect I6 and a lateral aspect I 8. V~hen the paticdnt loads the: joint, such as by standing, walking, or other activities, forces are transmittedto tl~e femoral hip implant 10 through the head 12. These forces tend to crenate a'bending moment that ,places the medial aspect 16 of the femoral hip implant in compression and the lateral aspect ~ 8 in l:ension.
BOO I6j The femoral hip implant I ~ rna~r include ;modular components such as a proximal body 20 and a stem 22. The proximal body 2~ has a top end 24 ana. a bottom end 26. A neck 28 extends upwardly and medially from the flop e:nd 24 to su=pport the femoral head 12 for articulation with the acetabular component 14. The proximal body 20 and stem 22 ynclude a male/female junction for hold:~n~; them together. In then illustrative embodiment, the female side of the junction is depicted in the proximal;body 2~ and tl~e male side of the junction is depicted on the stem 22. It is conte=mplated that the male/fernale portions may be reversed and still fall within the scope of the invention. The proximal bady 20 includes a bore 30 FIG. 2~ having a bore opening 32 and an interior surface 34 forming the female side of the male/female junction. The bore 3~ has a longitudinal junction axis, 36, The proximal body 20 has an exterior surface 38 spaced h-om the interior surface 34 of the bore 3D. The exterior 38 and inte;ri.or 34 surfaces define a will 40 between them. The wala 40 has-a wall thickness 42 that may be constant or that may increase from the bore opening 32 toward the top end 24 as shown in FIG. 2. An increasing wall thickness xnay be ac;cornpli.shed by tapering the bore such that it narrows from the bore opening 32 toward the top end 24 as ir°f the illustrative embodiment. A tapered bore c'cn be made self locking as i s k~~ovan in the art.
~OOI7j The; stem 22 includes a bottom end 44 and a top end 46. The bottom end 44 is configured for insertion into the intra.~nedullary canal of the patier..t's femur. The top end 46 includes a projection 48 having an exterior surface ~0 forming the ra~ale side of the rnale/female junction. The projection 48 is engageable v~rith the bore 30 in male/female seating arrangement along the ju;.ZCtion axis 36. A tl~xeaded stud 33 extends froir~ the projection 4~ and is received by :a counter bore 35 formed in t'~e :proximal body 20. .~. nut 37 threads onto the stud 33 to secure; the male/female junction.
[001 ~j When the femoral hip implant 10 is loaded, the medi~.1 aspects of the proximal body 20 and stem 22 are placed in compression and the lateral aspects of the proximal body 20 and stem 22 are placed in tension. l3ue to differences in the bending stiffness of the proximal body 20 and stern 22 in the regicyn of the male/female junction, the bore wall ~.0 may move relative to the exterior surface 50 of the projection 48, ~ycl:ic loading can lead to fretting between the interior surface 3~ c~fthe bore 30 arx.d exterior surface a>0 of the projection ~8.
'This may be mo~°e problematic on the tension side since tensile, f~rces may initiate and propagate fatigue cracks.
X0019] The magnitude of the fretting motion is related to the relative stiffness of the male and female parts of the junction. The relative motion at the opening 32 of the bore 30 is an accumulation of the relative rrr~ot~ion along the entire length of the j unction. T his accumulated relative motion may be decreased by decreasing the length along which the relative motion accumulates on the tensile side of the junction., However, it: is ineffective to simply make the junction shorter, because this w.ll create higher stresses on ~tl~e smaller diameter male cross sectiowwhere such a shortened junction would end. However, by shortening only the tensile;
side, the compressive side is still supported and the tensile ;9tres,s at the end of the tensile side increases only slightly while the; relative fretting motion decreases signiircantly. In the illustrative embodiment, a Lateral portion 52 of the bore opening 3 ~ is offset axially upwardly relative to a medial portion 54. This offset, or relieved, portion 52 can be created by stepping up the lateral portion 52, slopia~g up the lateral side such that the bore opening 32 is transverse to the junction axis 3~, or by forming the bore opening in some other suitable shape.
[0020] Fretting in the male/fe~~nale junction can also be reduced by better matching the stiffness of the male and female :~idcs of the male/female junction. T he present investigators have found that one way to better match the stiffness of the male a~a.d female sides is to increase the stiffness of the bore wall ~0 adjacent the bore opening 32 on the tensile side of the implant 10. Increasing the stiffness can be accomplished by in~~reasing the outer diameter of the proximal bode 20 adjacent the bore opening 32 to move material radially away from. the junction axis 3~ such that the bending moment of inertia is increased.
Increasing this stiffness can also be accomplished by increasing the wall thickness of the proximal body 20 at the junction of the proxianaa body 20 arid projE;ction 48.
In the illustrative embodiment, the bore 30 is tapered so that it nart°ows proximally and the wall thickness 42 increases proximally. Icy offsetting a lateral portion.~2 of the bore opening 32 axially upwardly relative to a medial L3ortion 54 the wall thickness on the lateral side 18 of the bore opening 32 is increased. This offset, or relieved, portion 52 can be created by sloping the lateral side such that the bare opening 32 is transverse t:o the junction axis 36 as shown, by stepping up the lateral portion 52; or-by forming the bore opening in some other suitable shape. In the illustrative embodiment, the projectic~~z 48 farming the male side of thf;
junction narrows upwardly. Thy2s, arzoving the lateral portion 52 u~~wardly also moves the lateral interface to an area of decreased stiffness of the proj ection 48 to fvzrther match the stiffness of the male and female portir~ns laterally. Finally, by mowing the lateral side upwardly while having the medial, anterior, and posterior sides c~ftr~e junction extend further downwardly, the fatigue properti°s of tl~e lateral side are irnp~~~o~,red while the overall interface of the male and female parts is kept relatively large to facilitate sec~2-re engagement between them.
[0021] Another way increase the stiffness of the bore wall 41~ is to enlarge the bore 30 on just the tensile side of the junction as showy in FIO. 3 such that tlm bore wall is offset away from the projection ~~. This has the same effect as moving the tensile side axially upwardly as described above. Other ways of better matching the stiffness of the male and female sides of the junction may also be used end are considered within the scope of this invention.
j0022j It will be understood by those spilled in the art that tl~e foregoing has described illustrative embodiments of the present invention and that variations may be made to these embodiments without departing from the spirit and scope of the invention defined by the appended claims.
Claims (13)
1. A modular joint implant including a male/female junction, the implant comprising:
a first component including a bore having a bore opening and an interior surface forming a female side of the male/female junction, the bore having a longitudinal junction axis;
a second component including a projection having an exterior surface forming a male side of the male/female junction, the projection being engageable with the bore in male/female seating arrangement along the junction axis, the bore and projection being in contact over an area extending longitudinally from the bore opening, a first portion of the contact area adjacent to the bore opening being offset axially relative to a second portion of the contact area adjacent to the bore opening.
a first component including a bore having a bore opening and an interior surface forming a female side of the male/female junction, the bore having a longitudinal junction axis;
a second component including a projection having an exterior surface forming a male side of the male/female junction, the projection being engageable with the bore in male/female seating arrangement along the junction axis, the bore and projection being in contact over an area extending longitudinally from the bore opening, a first portion of the contact area adjacent to the bore opening being offset axially relative to a second portion of the contact area adjacent to the bore opening.
2. The implant of claim 1 wherein a portion of the bore opening is offset axially relative to a second portion of the bore opening.
3. The implant of claim 2 wherein at least a portion of the bore opening is formed transverse to the junction axis to shift the male/female junction contact longitudinally along the axis at that portion.
4. The implant of claim 2 wherein the bore and the projection form complimentary tapers such that the projection engages the bore in male/female taper seating arrangement.
5. The implant of claim 4 wherein the tapers are self-locking.
6. The implant of claim 2 wherein the first component has an exterior surface spaced from the interior surface of the bore, the exterior and interior surfaces defining a wall between them, the wall having a wall thickness that increases over a portion of the wall from a first location to a second location in a direction generally parallel to the junction axis, the first portion of the bore opening being offset axially in the direction of increasing wall thickness.
7. The implant of claim 2 wherein the implant has a compression side and a tension side in use, the first portion of the bore opening being offset axially on the tension side of the implant.
8. The implant of claim 2 wherein the first component has an exterior surface spaced from the interior surface of the bore, the exterior and interior surfaces defining a wall between them, the wall having a stiffness that increases in a direction generally parallel to the junction axis, the projection further having a stiffness, the first portion of the bore opening being offset in the direction of increasing wall stiffness such that the stiffness of the wall adjacent the first portion of the bore opening is closer to the stiffness of the projection than it would be if it were not offset.
9. The implant of claim I wherein a portion of the bore opening is offset radially away from the projection.
10. A modular hip joint implant including a male/female junction, the implant comprising:
a proximal body component having a top end, a bottom end, a medial aspect, and a lateral aspect, a neck formed adjacent the top end and a bore formed into the bottom end, the bore having a bore opening and an interior surface forming a female side of the male/female junction, the bore having a longitudinal junction axis;
a stem component having a first end and a second end, a projection formed adjacent the first end, the projection having an exterior surface forming a male side of the male/female junction, the projection being engageable with the bore in male/female seating arrangement along the junction axis, the male and female sides contacting one another adjacent the bore opening, the bore opening having a portion adjacent the lateral aspect that is offset axially toward the top end relative to a portion of the bore opening adjacent the medial aspect such that the male/female junction contact at the first portion is shifted longitudinally along the junction axis relative to the second portion.
a proximal body component having a top end, a bottom end, a medial aspect, and a lateral aspect, a neck formed adjacent the top end and a bore formed into the bottom end, the bore having a bore opening and an interior surface forming a female side of the male/female junction, the bore having a longitudinal junction axis;
a stem component having a first end and a second end, a projection formed adjacent the first end, the projection having an exterior surface forming a male side of the male/female junction, the projection being engageable with the bore in male/female seating arrangement along the junction axis, the male and female sides contacting one another adjacent the bore opening, the bore opening having a portion adjacent the lateral aspect that is offset axially toward the top end relative to a portion of the bore opening adjacent the medial aspect such that the male/female junction contact at the first portion is shifted longitudinally along the junction axis relative to the second portion.
11. The implant of claim 10 wherein the bore and the projection form complimentary tapers, the tapers narrowing from the second end toward the first end.
12. The implant of claim 11 wherein the proximal body component has an exterior surface spaced from the interior surface of the bore, the exterior and interior surfaces defining a wall between them, the wall having a wall thickness that increases over a portion of the wall between the second end and the first end as the bore taper diverges inwardly from the exterior wall in a direction generally parallel to the junction axis such that the first portion of the bore opening is offset axially in the direction of increasing wall thickness.
13. The implant of claim 10 further comprising a femoral head component supported on the neck of the proximal body component and an acetabular component engageable with the femoral head component.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US10/748,824 US6905515B1 (en) | 2003-12-27 | 2003-12-27 | Junction for a modular implant |
US10/748,824 | 2003-12-27 |
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CA2482875A1 CA2482875A1 (en) | 2005-06-27 |
CA2482875C true CA2482875C (en) | 2011-11-01 |
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CA2482875A Active CA2482875C (en) | 2003-12-27 | 2004-09-29 | Junction for a modular implant |
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US (1) | US6905515B1 (en) |
EP (1) | EP1547548B1 (en) |
JP (1) | JP4589098B2 (en) |
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CA (1) | CA2482875C (en) |
DE (1) | DE602004020571D1 (en) |
ES (1) | ES2321835T3 (en) |
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US7297166B2 (en) | 2003-06-25 | 2007-11-20 | Depuy Products, Inc. | Assembly tool for modular implants and associated method |
US7582092B2 (en) | 2003-06-25 | 2009-09-01 | Depuy Products, Inc. | Assembly tool for modular implants and associated method |
US8998919B2 (en) | 2003-06-25 | 2015-04-07 | DePuy Synthes Products, LLC | Assembly tool for modular implants, kit and associated method |
US7074224B2 (en) * | 2003-06-25 | 2006-07-11 | Depuy Products, Inc. | Modular tapered reamer for bone preparation and associated method |
US7455695B2 (en) * | 2004-06-28 | 2008-11-25 | Depuy Products, Inc. | Modular prosthesis and locking nut therefor |
US8597298B2 (en) | 2006-09-29 | 2013-12-03 | DePuy Synthes Products, LLC | Proximal reamer |
US8157869B2 (en) | 2007-01-10 | 2012-04-17 | Biomet Manufacturing Corp. | Knee joint prosthesis system and method for implantation |
US8562616B2 (en) | 2007-10-10 | 2013-10-22 | Biomet Manufacturing, Llc | Knee joint prosthesis system and method for implantation |
US8328873B2 (en) | 2007-01-10 | 2012-12-11 | Biomet Manufacturing Corp. | Knee joint prosthesis system and method for implantation |
US8163028B2 (en) | 2007-01-10 | 2012-04-24 | Biomet Manufacturing Corp. | Knee joint prosthesis system and method for implantation |
US8187280B2 (en) | 2007-10-10 | 2012-05-29 | Biomet Manufacturing Corp. | Knee joint prosthesis system and method for implantation |
US8556912B2 (en) | 2007-10-30 | 2013-10-15 | DePuy Synthes Products, LLC | Taper disengagement tool |
US8518050B2 (en) | 2007-10-31 | 2013-08-27 | DePuy Synthes Products, LLC | Modular taper assembly device |
US8167882B2 (en) | 2008-09-30 | 2012-05-01 | Depuy Products, Inc. | Minimally invasive bone miller apparatus |
US8562690B1 (en) | 2010-04-22 | 2013-10-22 | Zimmer, Inc. | Modular revision femoral prosthesis |
US8533921B2 (en) | 2010-06-15 | 2013-09-17 | DePuy Synthes Products, LLC | Spiral assembly tool |
US8623093B2 (en) | 2010-07-07 | 2014-01-07 | Zimmer, Inc. | Sleeve for modular revision hip stem |
US9095452B2 (en) | 2010-09-01 | 2015-08-04 | DePuy Synthes Products, Inc. | Disassembly tool |
CN106974699B (en) | 2011-04-06 | 2019-07-09 | 德普伊新特斯产品有限责任公司 | The device assembly of implantation amendment hip prosthesis |
WO2014074647A1 (en) * | 2012-11-06 | 2014-05-15 | Ihip Surgical, Llc | Monoblock head and neck unit for total hip replacement |
GB201705917D0 (en) | 2017-04-12 | 2017-05-24 | Davidson Craig | Femoral trialling kit and assembly |
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US5413610A (en) * | 1986-12-25 | 1995-05-09 | Kyocera Corporation | Artificial hip joint |
CH671689A5 (en) * | 1987-05-15 | 1989-09-29 | Sulzer Ag | |
CA1304889C (en) * | 1988-05-12 | 1992-07-14 | Peter John Brooks | Femoral insert |
GB2222776B (en) * | 1988-09-15 | 1992-12-02 | Mclardy Smith Peter David | A prosthesis |
EP0385585A1 (en) * | 1989-02-06 | 1990-09-05 | Stephen M. Horowitz, M.D. | A hip prosthesis and method for implanting the same |
FR2644691B1 (en) * | 1989-03-23 | 1991-11-15 | Desmarquest Ceramiques Tech | FEMALE PROSTHESIS USING A SMALL DIAMETER CERAMIC BALL JOINT |
US4917530A (en) * | 1989-08-31 | 1990-04-17 | Boehringer Mannheim Corporation | Structural joint |
JP3311748B2 (en) * | 1990-06-06 | 2002-08-05 | セケル、ロナルド | Hip prosthesis |
JPH04170948A (en) * | 1990-11-02 | 1992-06-18 | Dow Corning Wright Corp | Forward tilting adjustable artificial hip joint of module |
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US5954771A (en) * | 1993-02-16 | 1999-09-21 | Wright Medical Technology, Inc. | Dual fixation prosthesis |
IT1262759B (en) * | 1993-07-16 | 1996-07-04 | Mec Hint S R L | IMPROVEMENT OF THE BLOCK BETWEEN THE COMPONENTS OF A MULTI-COMPOSED PROSTHESIS FOR USE IN ORTHOPEDIC AND VETERINARY TRAUMATOLOGY |
FR2766356B1 (en) * | 1997-07-22 | 1999-10-15 | Beguec Pierre Le | IMPLANTATION DEVICE FOR FEMALE RECOVERY PROSTHESIS, CEMENT-FREE AND MODULAR |
US6090146A (en) | 1999-06-16 | 2000-07-18 | Bristol-Myers Squibb Company | Fastener for a modular implant |
US6238435B1 (en) | 2000-03-10 | 2001-05-29 | Bristol-Myers Squibb Co | Assembly tool for prosthetic implant |
US6330845B1 (en) | 2000-05-17 | 2001-12-18 | Bristol-Myers Squibb | Wrench for an implant |
JP2003010215A (en) * | 2001-07-02 | 2003-01-14 | Kyocera Corp | Redintegration member for thighbone |
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2003
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- 2004-12-24 AU AU2004242524A patent/AU2004242524B2/en active Active
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US20050143835A1 (en) | 2005-06-30 |
EP1547548B1 (en) | 2009-04-15 |
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JP2005193022A (en) | 2005-07-21 |
AU2004242524A1 (en) | 2005-07-14 |
AU2004242524B2 (en) | 2009-11-19 |
CA2482875A1 (en) | 2005-06-27 |
JP4589098B2 (en) | 2010-12-01 |
EP1547548A3 (en) | 2006-03-22 |
US6905515B1 (en) | 2005-06-14 |
DE602004020571D1 (en) | 2009-05-28 |
ATE428381T1 (en) | 2009-05-15 |
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