CA2088226A1 - Femoral component for use in a replacement hip prosthesis - Google Patents
Femoral component for use in a replacement hip prosthesisInfo
- Publication number
- CA2088226A1 CA2088226A1 CA002088226A CA2088226A CA2088226A1 CA 2088226 A1 CA2088226 A1 CA 2088226A1 CA 002088226 A CA002088226 A CA 002088226A CA 2088226 A CA2088226 A CA 2088226A CA 2088226 A1 CA2088226 A1 CA 2088226A1
- Authority
- CA
- Canada
- Prior art keywords
- stem
- femoral component
- hip joint
- replacement hip
- sheath
- 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.)
- Abandoned
Links
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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30907—Nets or sleeves applied to surface of prostheses or in cement
-
- 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
- A61F2/30721—Accessories
- A61F2/30724—Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
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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
-
- 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
- A61F2/3676—Distal or diaphyseal parts of shafts
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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
- A61F2/3672—Intermediate parts of shafts
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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
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30112—Rounded shapes, e.g. with rounded corners
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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
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30138—Convex polygonal shapes
- A61F2002/30153—Convex polygonal shapes rectangular
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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
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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
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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
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30565—Special structural features of bone or joint prostheses not otherwise provided for having spring elements
- A61F2002/30571—Leaf springs
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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
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30579—Special structural features of bone or joint prostheses not otherwise provided for with mechanically expandable devices, e.g. fixation devices
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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
- A61F2/30767—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
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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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30907—Nets or sleeves applied to surface of prostheses or in cement
- A61F2002/30919—Sleeves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2002/4631—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
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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
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0004—Rounded shapes, e.g. with rounded corners
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0017—Angular shapes
- A61F2230/0019—Angular shapes rectangular
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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
- 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
- A61F2310/00353—Bone cement, e.g. polymethylmethacrylate or PMMA
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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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00389—The prosthesis being coated or covered with a particular material
- A61F2310/00952—Coating, pre-coating or prosthesis-covering structure made of bone cement, e.g. pre-applied PMMA cement mantle
Abstract
ABSTRACT
A femoral component of a replacement hip joint having a collarless stem including a shoulder for fixing in a medullary canal by cement, said stem beneath the shoulder having a straight taper and the anterior and posterior faces of said stem each having a concave surface formed by a longitudinally extending curve from the top of said shoulder to the distal tip of said stem.
A femoral component of a replacement hip joint having a collarless stem including a shoulder for fixing in a medullary canal by cement, said stem beneath the shoulder having a straight taper and the anterior and posterior faces of said stem each having a concave surface formed by a longitudinally extending curve from the top of said shoulder to the distal tip of said stem.
Description
FEMORAL COMPONENT FOR USE IN A REPLACEMENT HIP JOINT
This invention relates to a femoral component for use in a replacement hip joint.
The Exeter type femoral component of the kind shown in British Patent Specification No. 1 409 054 is well known and comprises a neck which carries a ball head for co-operation with an acetabular socket. The neck is connected to a collarless stem which includes a shoulder, the stem beneath the shoulder having a straight taper. Thus there is no collar for resting either on the bone or the cement in the area where the stem joins the neck of the implant. This type of stem has evolved so that the stem can be given a polished finish to help it slide down inside the bone cement. The term "straight taper" in relation to the stem refers to the centre line axis of the shape of the stem.
The present invention relates to this type of femoral component.
According to the present invention a femo~al component of a replacement hip joint has a collarless stem including a shoulder, for fixing in a medullary canal by cement, said stem beneath the shoulder having a straight taper and the anterior and posterior faces of said stem having a concave surface formed by a longitudinally extending curve from the top of said shoulder to the distal tip of said stem.
preferably the lateral and medial surfaces of said stem beneath said shoulder also each have a concave surface formed by a longitudinally extending curve.
Thus the concavity of each of the faces only exists in one plane for each face, for example, that for the ~ 0 ~ b anterior face can only be seen when viewed from the direction of the lateral or medial face.
The effect of the concave surfaces is that the taper angle is slightly steeper than in the known constructions, on the proximal part of the stem, that is the end near the hip joint bearing surface, and shallower at the tip or distal end.
At the hip joint bearing surfaces all the load transfers from the acetabular component into the femoral component of the implant. Beyond the distal end of the femoral component stem all this load has been transferred into the bone. Between the cut end of the femur proximally and the distal tip of the femoral stem the load gradually transfers from the implant into bone. The distribution of this load transfer along the length of the femoral stem is influenced at each cross-sectional level by the relative stiffness of the implant, the bone cement mantle ~nd the surrounding bone. Many femoral hip stem implants have high cross-sections near their distal tip giving high~sectional stiffness and this causes a high proportion of the load from the bearing surface to be retained within the implant and transferred out through the bone cement mantle into the bone near the distal end of the implant. Conversely, stems which are very flexible distally (by virtue of the choice of material modulus or sectional geometry) cause a greater proportion of the load to be transferred into the bone at or near the proximal end of the femur. In the extreme the absolutely flexible stem has a stiffness of zero, that is the distal stem has been designed out, and all the load transfer occurs through whatever proximal portion of the stem has been left by the designer.
_3_ The arrangement according to the invention therefore provides relative rigidity at the top end of the implant which is greater than the distal end. This transfers more load from the hip stem onto the bone through the bone cement mantle at the top and less passes down the stem and is transferred out into the bone at the distal end. Transfer of load onto the top end of the femur is thought to be beneficial in order to avoid bone resorbtion.
A further advantage is that at the present in some patients a point about half way up the stem in existing devices is found to come very close to the internal bone wall and leaves very little space for cement. Thus although the existing type of stem has straight tapering edges the inside form of the cortical bone is more trumpet shaped.
Therefore, by providing concave surfaces on the stem the thickness of the cement mantle thickness laterally in this area can be increased to a more acceptable thickness, at least 1 mm and preferably 12 mm - 2 mm.
It is important in the present arrangement that the edges and side faces of the stem never become parallel because this will lose the advantage of taper locking engagement either before or after any subsidence. The stem must be always narrowing as it progresses downwards but it is not necessary to maintain a constant taper angle.
The stem can have a rectangular, elliptical or trapezoidal cross-section, and at the distal tip it can be substantially circular.
Preferably the surface of the stem is polished and it can be used with a distal void centraliser.
It has been found to be advantageous to avoid the use of any grooves, notches, holes, ridges, matt surfaces, macro surfaces as these tend to impair the engagement efficiency of the stem.
A sheath as described in British Patent Application No. 9011132.6 can be incorporated.
The invention can be performed in many ways but one embodiment will now be described by way of example and with reference to the accompanying drawings in which :-Figure 1 is a side elevation of a femoral componentaccording to the present invention;
Figure 2 is an end elevation of the component shown in Figure l;
Figure 3 is a cross-sectional plan view on line III-III of Figure 2;
Figure 4 is a side elevation of a femoral component incorporating a sheath as set out in British Patent Application No. 9011132.6;
Figure S shows the distal end of a sheath as shown in Figure 4 but of a different configuration; and, Figure 6 is a cross-sectional elevation of the distal end of an alternative construction employing a separate centraliser.
As shown in the drawings the femoral component of a replacement hip joint has a collarless stem 1 of substantially rectangular cross-section. The stem is 20~8~26 intended for fixing in position in a medullary canal 2 of a femur indicated by broken lines 3 by cement in well known manner. The stem has a continuous taper from its distal end 4 to a shoulder 5 where it merges into a neck 6. The neck 6 communicates with a boss 7 to receive a ball head indicated by broken lines 8 which will co-operate with an acetabular socket.
As will be seen from the drawings the anterior side face 9 of the stem including the 60~-~ar 5 is substantially X
flat until it merges into the neck 6 which is of circular cross-section. The posterior side face 10 is of similar configuration. These faces are radiused with a longitudinally extending curve so that they are concave.
Broken lines 12 and 13 indicated the straight line shape if there was no concavity. The shaping extends from the distal tip 4 and up through the shoulder 5 on these faces to the neck 6. At the upper end there is a high concave radius as indicated by reference numeral 11, the radius decreasing thereafter and finally running out at the distal tip 4.
The centre line of the tapering straight lower stem portion is indicated at 14.
The lateral face 15 and medial face 16 of the stem are also tapered below the shoulder 5. The curving inner medial face 17 of the shoulder 5 merges into the straight tapering portion of the stem at a point 18 and the convex surface 19 on the lateral face of the shoulder 5 merges into the straight tapering stem at the point indicated by reference numeral 20.
Below the points 18 and 20 the surfaces of lateral and medial faces 15 and 16 are shaped concave. The relative straight line shapes of the faces if they were not concave are shown by broken lines 21, 22.
A relatively large radius is employed on these lateral and medial faces. The maximum depth of concavity away from the straight surface from which they are cut is about 1 mm - 2 mm.
For a stem length of typically 150 mm (the implanted or cemented section) the position of maximum depth of concavity would be typically one-half to two-thirds down the length of the stem portion on the lateral side. On the medial side the entire geometry from tip to neck becomes a complex radius.
' The cross-section of the stem as shown in Figure 3 is substantially rectangular with radiused corners. The surfaces can be flat but in the arrangement shown they are slightly bowed outwardly. At the distal tip 4 the rectangular cross-section becomes substantially circular.
In the arrangement shown the femoral component is intended for use with a removable ball head 8 but if desired the ball head could be integral with the stem.
The surface of the stem, incorporating the shoulder, is highly polished and if desired a distal void centraliser, for example of the kind set forth in British Patent Specification No. 2 104 391 can be used with it.
Figures 4 and 5 show how a sheath can be included and the same reference numerals are used to indicate similar parts to Figures 1, 2 and 3.
As shown in Figure 4 the stem 1 is enclosed in a sheath 29 which covers the stem from its distal tip 4 to a location adjacent the proximal cut end 2 of the femur 3. In the arrangement shown this end 31 of the sheath is shown slightly protruding from the cement mantle 2~ and has a cut-out opening 32 extending from its end 31 to a point 33, to assist assembly.
The sheath is made from a material similar to bone cement material, for example polymethylmethacrylate, and its distal end 34 is somewhat longer than the end 4 of the stem 1 to create a void 35. The internal side walls of the distal end 34 can be parallel up to a point about 1 - 2 cm from the end 4 of the stem as indicated by reference numeral 36.
The thickness of the sheath is about 1 mm and can be made as a separate moulding.
Optionally moulded into the sheath are four thin outwardly projecting abutments 24 in the form of four equally spaced tangentially projecting wings or arms. These abutments act as a centraliser and to hold the stem 1 away from the wall of the medullary canal during implantation.
The projections can resiliently deform circumferentially inwardly as the stem, together with the sheath, is pushed into place in the canal 2.
With the sheath in position the centraliser provided by the abutments becomes well integrated with the cement, as does the remains of the sheath thus avoiding any weakening or hole creation.
If there is now a tendency for the stem to move further into the cement mantle this is accommodated by movement within the sheath which, it will be appreciated, 2088~2~
has become integral with the cement mantle itself but, because it is not connected to the stem adhesion between the cement and the stem is reduced and therefore the frictional resistance to the subsiding action or re-engagement of the stem is reduced.
An alternative construction of the sheath is shown in Figure 5 and in which similar reference numerals are used to indicate similar parts.
With this arrangement the void 35 is again created when the sheath 29 is placed on the stem 1 (not shown in Figure 5). In this construction however the abutments 24 are provided by three radially and upwardly extending arms 25 spaced around the sheath and which again act to centralise the stem in the medullary canal.
In an alternative and preferred construction a separate centraliser is used as shown in Figure 6. In this construction the same reference numerals are used to indicate similar parts to those shown in Figures '4 and 5, but no centraliser abutments 24 are provided on the sheath itself. The distal end 34 of the sheath has a spigot 40 on which is located a separate centraliser 41 which comprises a central boss 42 having a blind bore 43 which is a push fit onto the spigot 40. Three radially and upwardly projecting arms 44 extend outwardly from the central boss 42 ana act to centralise and hold the stem 1 away from the wall of the medullary canal in a similar manner to the abutments 24.
The centraliser 41 can be made from the same material as the sheath but filler can be added to improve the flexibility of the projecting arms 44.
When the prosthesis is to be implanted the surgeon fits the appropriate size of preformed sheath to the stem of 2 0 ~
_9_ the prosthesis, the sheath including the integrally formed centraliser with a void creator on the distal tip. The assembled stem and sheath are then inserted into the bone cavity which has already been filled with normal bone cement in the normal way. The preformed cement sheath bonds directly with the bone cement inserted by the surgeon. The material of the sheath and the cement are identical or compatible so that they are bonded together.
It is important that the preformed sheath is separate from the stem, it cannot be provided merely by a coating applied to the stem as this will not give the same low friction characteristics at the surface of the stem which are required.
It is possible to provide a lubricant between the preformed sheath and the stem in order to reduce friction still further, a suitable sterile lubricant being used, for example sterile liquid paraffin.
This kind of construction is intended to provide an optimisation of the interface conditions between the cement in an intramedullary canal and the surface of the stem. The avoidance of windows in the cement and direct contact between metal and bone is also an advantage.
This invention relates to a femoral component for use in a replacement hip joint.
The Exeter type femoral component of the kind shown in British Patent Specification No. 1 409 054 is well known and comprises a neck which carries a ball head for co-operation with an acetabular socket. The neck is connected to a collarless stem which includes a shoulder, the stem beneath the shoulder having a straight taper. Thus there is no collar for resting either on the bone or the cement in the area where the stem joins the neck of the implant. This type of stem has evolved so that the stem can be given a polished finish to help it slide down inside the bone cement. The term "straight taper" in relation to the stem refers to the centre line axis of the shape of the stem.
The present invention relates to this type of femoral component.
According to the present invention a femo~al component of a replacement hip joint has a collarless stem including a shoulder, for fixing in a medullary canal by cement, said stem beneath the shoulder having a straight taper and the anterior and posterior faces of said stem having a concave surface formed by a longitudinally extending curve from the top of said shoulder to the distal tip of said stem.
preferably the lateral and medial surfaces of said stem beneath said shoulder also each have a concave surface formed by a longitudinally extending curve.
Thus the concavity of each of the faces only exists in one plane for each face, for example, that for the ~ 0 ~ b anterior face can only be seen when viewed from the direction of the lateral or medial face.
The effect of the concave surfaces is that the taper angle is slightly steeper than in the known constructions, on the proximal part of the stem, that is the end near the hip joint bearing surface, and shallower at the tip or distal end.
At the hip joint bearing surfaces all the load transfers from the acetabular component into the femoral component of the implant. Beyond the distal end of the femoral component stem all this load has been transferred into the bone. Between the cut end of the femur proximally and the distal tip of the femoral stem the load gradually transfers from the implant into bone. The distribution of this load transfer along the length of the femoral stem is influenced at each cross-sectional level by the relative stiffness of the implant, the bone cement mantle ~nd the surrounding bone. Many femoral hip stem implants have high cross-sections near their distal tip giving high~sectional stiffness and this causes a high proportion of the load from the bearing surface to be retained within the implant and transferred out through the bone cement mantle into the bone near the distal end of the implant. Conversely, stems which are very flexible distally (by virtue of the choice of material modulus or sectional geometry) cause a greater proportion of the load to be transferred into the bone at or near the proximal end of the femur. In the extreme the absolutely flexible stem has a stiffness of zero, that is the distal stem has been designed out, and all the load transfer occurs through whatever proximal portion of the stem has been left by the designer.
_3_ The arrangement according to the invention therefore provides relative rigidity at the top end of the implant which is greater than the distal end. This transfers more load from the hip stem onto the bone through the bone cement mantle at the top and less passes down the stem and is transferred out into the bone at the distal end. Transfer of load onto the top end of the femur is thought to be beneficial in order to avoid bone resorbtion.
A further advantage is that at the present in some patients a point about half way up the stem in existing devices is found to come very close to the internal bone wall and leaves very little space for cement. Thus although the existing type of stem has straight tapering edges the inside form of the cortical bone is more trumpet shaped.
Therefore, by providing concave surfaces on the stem the thickness of the cement mantle thickness laterally in this area can be increased to a more acceptable thickness, at least 1 mm and preferably 12 mm - 2 mm.
It is important in the present arrangement that the edges and side faces of the stem never become parallel because this will lose the advantage of taper locking engagement either before or after any subsidence. The stem must be always narrowing as it progresses downwards but it is not necessary to maintain a constant taper angle.
The stem can have a rectangular, elliptical or trapezoidal cross-section, and at the distal tip it can be substantially circular.
Preferably the surface of the stem is polished and it can be used with a distal void centraliser.
It has been found to be advantageous to avoid the use of any grooves, notches, holes, ridges, matt surfaces, macro surfaces as these tend to impair the engagement efficiency of the stem.
A sheath as described in British Patent Application No. 9011132.6 can be incorporated.
The invention can be performed in many ways but one embodiment will now be described by way of example and with reference to the accompanying drawings in which :-Figure 1 is a side elevation of a femoral componentaccording to the present invention;
Figure 2 is an end elevation of the component shown in Figure l;
Figure 3 is a cross-sectional plan view on line III-III of Figure 2;
Figure 4 is a side elevation of a femoral component incorporating a sheath as set out in British Patent Application No. 9011132.6;
Figure S shows the distal end of a sheath as shown in Figure 4 but of a different configuration; and, Figure 6 is a cross-sectional elevation of the distal end of an alternative construction employing a separate centraliser.
As shown in the drawings the femoral component of a replacement hip joint has a collarless stem 1 of substantially rectangular cross-section. The stem is 20~8~26 intended for fixing in position in a medullary canal 2 of a femur indicated by broken lines 3 by cement in well known manner. The stem has a continuous taper from its distal end 4 to a shoulder 5 where it merges into a neck 6. The neck 6 communicates with a boss 7 to receive a ball head indicated by broken lines 8 which will co-operate with an acetabular socket.
As will be seen from the drawings the anterior side face 9 of the stem including the 60~-~ar 5 is substantially X
flat until it merges into the neck 6 which is of circular cross-section. The posterior side face 10 is of similar configuration. These faces are radiused with a longitudinally extending curve so that they are concave.
Broken lines 12 and 13 indicated the straight line shape if there was no concavity. The shaping extends from the distal tip 4 and up through the shoulder 5 on these faces to the neck 6. At the upper end there is a high concave radius as indicated by reference numeral 11, the radius decreasing thereafter and finally running out at the distal tip 4.
The centre line of the tapering straight lower stem portion is indicated at 14.
The lateral face 15 and medial face 16 of the stem are also tapered below the shoulder 5. The curving inner medial face 17 of the shoulder 5 merges into the straight tapering portion of the stem at a point 18 and the convex surface 19 on the lateral face of the shoulder 5 merges into the straight tapering stem at the point indicated by reference numeral 20.
Below the points 18 and 20 the surfaces of lateral and medial faces 15 and 16 are shaped concave. The relative straight line shapes of the faces if they were not concave are shown by broken lines 21, 22.
A relatively large radius is employed on these lateral and medial faces. The maximum depth of concavity away from the straight surface from which they are cut is about 1 mm - 2 mm.
For a stem length of typically 150 mm (the implanted or cemented section) the position of maximum depth of concavity would be typically one-half to two-thirds down the length of the stem portion on the lateral side. On the medial side the entire geometry from tip to neck becomes a complex radius.
' The cross-section of the stem as shown in Figure 3 is substantially rectangular with radiused corners. The surfaces can be flat but in the arrangement shown they are slightly bowed outwardly. At the distal tip 4 the rectangular cross-section becomes substantially circular.
In the arrangement shown the femoral component is intended for use with a removable ball head 8 but if desired the ball head could be integral with the stem.
The surface of the stem, incorporating the shoulder, is highly polished and if desired a distal void centraliser, for example of the kind set forth in British Patent Specification No. 2 104 391 can be used with it.
Figures 4 and 5 show how a sheath can be included and the same reference numerals are used to indicate similar parts to Figures 1, 2 and 3.
As shown in Figure 4 the stem 1 is enclosed in a sheath 29 which covers the stem from its distal tip 4 to a location adjacent the proximal cut end 2 of the femur 3. In the arrangement shown this end 31 of the sheath is shown slightly protruding from the cement mantle 2~ and has a cut-out opening 32 extending from its end 31 to a point 33, to assist assembly.
The sheath is made from a material similar to bone cement material, for example polymethylmethacrylate, and its distal end 34 is somewhat longer than the end 4 of the stem 1 to create a void 35. The internal side walls of the distal end 34 can be parallel up to a point about 1 - 2 cm from the end 4 of the stem as indicated by reference numeral 36.
The thickness of the sheath is about 1 mm and can be made as a separate moulding.
Optionally moulded into the sheath are four thin outwardly projecting abutments 24 in the form of four equally spaced tangentially projecting wings or arms. These abutments act as a centraliser and to hold the stem 1 away from the wall of the medullary canal during implantation.
The projections can resiliently deform circumferentially inwardly as the stem, together with the sheath, is pushed into place in the canal 2.
With the sheath in position the centraliser provided by the abutments becomes well integrated with the cement, as does the remains of the sheath thus avoiding any weakening or hole creation.
If there is now a tendency for the stem to move further into the cement mantle this is accommodated by movement within the sheath which, it will be appreciated, 2088~2~
has become integral with the cement mantle itself but, because it is not connected to the stem adhesion between the cement and the stem is reduced and therefore the frictional resistance to the subsiding action or re-engagement of the stem is reduced.
An alternative construction of the sheath is shown in Figure 5 and in which similar reference numerals are used to indicate similar parts.
With this arrangement the void 35 is again created when the sheath 29 is placed on the stem 1 (not shown in Figure 5). In this construction however the abutments 24 are provided by three radially and upwardly extending arms 25 spaced around the sheath and which again act to centralise the stem in the medullary canal.
In an alternative and preferred construction a separate centraliser is used as shown in Figure 6. In this construction the same reference numerals are used to indicate similar parts to those shown in Figures '4 and 5, but no centraliser abutments 24 are provided on the sheath itself. The distal end 34 of the sheath has a spigot 40 on which is located a separate centraliser 41 which comprises a central boss 42 having a blind bore 43 which is a push fit onto the spigot 40. Three radially and upwardly projecting arms 44 extend outwardly from the central boss 42 ana act to centralise and hold the stem 1 away from the wall of the medullary canal in a similar manner to the abutments 24.
The centraliser 41 can be made from the same material as the sheath but filler can be added to improve the flexibility of the projecting arms 44.
When the prosthesis is to be implanted the surgeon fits the appropriate size of preformed sheath to the stem of 2 0 ~
_9_ the prosthesis, the sheath including the integrally formed centraliser with a void creator on the distal tip. The assembled stem and sheath are then inserted into the bone cavity which has already been filled with normal bone cement in the normal way. The preformed cement sheath bonds directly with the bone cement inserted by the surgeon. The material of the sheath and the cement are identical or compatible so that they are bonded together.
It is important that the preformed sheath is separate from the stem, it cannot be provided merely by a coating applied to the stem as this will not give the same low friction characteristics at the surface of the stem which are required.
It is possible to provide a lubricant between the preformed sheath and the stem in order to reduce friction still further, a suitable sterile lubricant being used, for example sterile liquid paraffin.
This kind of construction is intended to provide an optimisation of the interface conditions between the cement in an intramedullary canal and the surface of the stem. The avoidance of windows in the cement and direct contact between metal and bone is also an advantage.
Claims (15)
1. A femoral component of a replacement hip joint having a collarless stem including a shoulder for fixing in a medullary canal by cement, said stem beneath the shoulder having a straight taper and the anterior and posterior faces of said stem each having a concave surface formed by a longitudinally extending curve from the top of said shoulder to the distal tip of said stem.
2. A femoral component of a replacement hip joint as claimed in claim 1 in which the lateral and medial faces of said stem beneath said shoulder also each have a concave surface formed by a longitudinally extending curve.
3. A femoral component of a replacement hip joint as claimed in claim 1 or claim 2 in which the stem has a rectangular, elliptical or trapezoidal cross-section.
4. A femoral component of a replacement hip joint as claimed in claim 1, claim 2 or claim 3 in which the cross-section of the stem at the distal tip is substantially circular.
5. A femoral component of a replacement hip joint as claimed in any one of the preceding claims in which the stem is polished.
6. A femoral component of a replacement hip joint as claimed in any one of the preceding claims in which the stem is provided with means to receive a ball head.
7. A femoral component of a replacement hip joint as claimed in any one of the preceding claims 1 to 6 in which the stem is provided with a ball head.
8. A femoral component of a replacement hip joint as claimed in any one of the preceding claims in which the stem is provided with a sheath made from an acrylic material.
9. A femoral component of a replacement hip joint as claimed in claim 8 in which said sheath is dimensioned to enclose the stem from the distal tip to a location on the stem which will be adjacent the proximal cut end of the femur with which it will be used.
10. A femoral component of a replacement hip joint as claimed in claim 8 or claim 9 in which the sheath is dimensioned and constructed to allow the stem to move further into it under load.
11. A femoral component of a replacement hip joint as claimed in claim 8, claim 9 or claim 10, in which the distal tip is in the form of a cup the inner end surface of which is spaced away from the distal end of the stem to provide a void.
12. A femoral component of a replacement hip joint as claimed in any one of preceding claims 8 to 11 in which said sheath has means for centralising the stem in the intramedullary canal of the femur with which it is to be used.
13. A femoral component of a replacement hip joint as claimed in as claimed in claim 12 in which the centralising means includes outwardly projecting resiliently deformable abutments.
14. A femoral component of a replacement hip joint as claimed in as claimed in any one of claims 8 to 11 including a centraliser which is adapted to fit on the distal end of the sheath.
15. A femoral component substantially as described herein with reference to and as shown in Figures 1, 2 and 3, Figure 4, Figure 5 and Figure 6 of the accomapnying drawings.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB929201734A GB9201734D0 (en) | 1992-01-28 | 1992-01-28 | Femoral component for use in a replacement hip prosthesis |
GB9201734.2 | 1992-01-28 |
Publications (1)
Publication Number | Publication Date |
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CA2088226A1 true CA2088226A1 (en) | 1993-07-29 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CA002088226A Abandoned CA2088226A1 (en) | 1992-01-28 | 1993-01-27 | Femoral component for use in a replacement hip prosthesis |
Country Status (11)
Country | Link |
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US (1) | US5458651A (en) |
EP (1) | EP0554987B1 (en) |
JP (1) | JP3548188B2 (en) |
AT (1) | ATE139896T1 (en) |
AU (1) | AU654226B2 (en) |
CA (1) | CA2088226A1 (en) |
DE (2) | DE69303385T2 (en) |
DK (1) | DK0554987T3 (en) |
ES (1) | ES2089714T3 (en) |
GB (1) | GB9201734D0 (en) |
GR (1) | GR3020709T3 (en) |
Families Citing this family (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020143402A1 (en) * | 1995-09-04 | 2002-10-03 | Limber Ltd. | Hip joint prostheses |
EP0959821B1 (en) * | 1996-08-13 | 2005-03-23 | James B. Grimes | Femoral head-neck prosthesis |
US5871549A (en) * | 1996-12-12 | 1999-02-16 | Johnson & Johnson Professional, Inc. | Femoral stem with reduced coefficient of friction with respect to bone cement |
FR2768328B1 (en) * | 1997-09-15 | 2000-02-18 | Tornier Sa | SOLIDARITY FEMALE IMPLANT OF CENTER PLOTS |
DE19740690A1 (en) * | 1997-09-16 | 1999-03-18 | Copf Franz Prof Dr Med | Cortical layer upper thigh bone prothesis |
FR2772595B1 (en) * | 1997-12-22 | 2001-03-23 | Groupe Lepine | CENTERING DEVICE FOR CEMENT-FIXED MEDULAR ROD |
ES2143324T3 (en) | 1998-02-11 | 2000-05-01 | Plus Endoprothetik Ag | PROTECTION OF FEMORAL HIP JOINT. |
GB9812068D0 (en) * | 1998-06-04 | 1998-08-05 | Benoist Girard & Cie | Prosthesis with centraliser and centraliser for use therewith |
EP0962199A1 (en) * | 1998-06-04 | 1999-12-08 | Sulzer Orthopädie AG | Shaft prosthesis |
GB9821993D0 (en) * | 1998-10-08 | 1998-12-02 | Johnson & Johnson Medical Ltd | Centraliser |
EP1013244A1 (en) * | 1998-12-21 | 2000-06-28 | Benoist Girard Et Cie | Prosthetic femoral component |
GB9902321D0 (en) * | 1999-02-02 | 1999-03-24 | Benoist Girard & Cie | Femoral component for use in a replacement hip joint |
KR100358191B1 (en) * | 2000-02-16 | 2002-10-25 | 한국과학기술원 | Jacket for cemented artificial joint and the artificial joint with it |
ES2223763T3 (en) * | 2000-03-01 | 2005-03-01 | Zimmer Gmbh | VASTAGO PROTESIS THAT CAN BE FIXED WITH CEMENT. |
AU2001247425A1 (en) | 2000-04-10 | 2001-10-23 | Advanced Cardiovascular Systems Inc. | Selectively coated stent delivery system and method of manufacture thereof |
US8920509B2 (en) | 2000-04-10 | 2014-12-30 | Biomet Manufacturing, Llc | Modular radial head prosthesis |
US8535382B2 (en) | 2000-04-10 | 2013-09-17 | Biomet Manufacturing, Llc | Modular radial head prostheses |
US8114163B2 (en) | 2000-04-10 | 2012-02-14 | Biomet Manufacturing Corp. | Method and apparatus for adjusting height and angle for a radial head |
US20020198589A1 (en) | 2001-06-22 | 2002-12-26 | Leong Veronica Jade | Tessellated stent and method of manufacture |
US6783553B2 (en) | 2001-10-24 | 2004-08-31 | James B. Grimes | Prosthesis |
DE20221834U1 (en) | 2001-12-04 | 2008-04-10 | Active Implants Corp., Memphis | Pillow-storage implants for load-bearing applications |
US7494509B1 (en) | 2002-02-04 | 2009-02-24 | Biomet Manufacturing Corp. | Method and apparatus for providing a short-stemmed hip prosthesis |
GB0207170D0 (en) * | 2002-03-26 | 2002-05-08 | Mcminn Derek J W | Hip joint prosthesis |
EP1509161B1 (en) | 2002-05-23 | 2009-05-13 | Active Implants Corporation | Joint and dental implants |
GB2419291A (en) | 2004-10-21 | 2006-04-26 | Biomet Uk Ltd | A femoral head prosthesis |
CA2598027C (en) * | 2005-02-22 | 2013-10-01 | Smith & Nephew, Inc. | Long sleeves for use with stems |
US20060264951A1 (en) | 2005-05-18 | 2006-11-23 | Nelson Charles L | Minimally Invasive Actuable Bone Fixation Devices Having a Retractable Interdigitation Process |
US9060820B2 (en) | 2005-05-18 | 2015-06-23 | Sonoma Orthopedic Products, Inc. | Segmented intramedullary fracture fixation devices and methods |
US8961516B2 (en) | 2005-05-18 | 2015-02-24 | Sonoma Orthopedic Products, Inc. | Straight intramedullary fracture fixation devices and methods |
DE202005020876U1 (en) * | 2005-11-16 | 2006-10-05 | Plus Orthopedics Ag | Endoprosthesis comprises a shaft, which extends along a primary axis, a distal end piece and a proximal end piece |
JP4599311B2 (en) * | 2006-02-02 | 2010-12-15 | 日本メディカルマテリアル株式会社 | Hip component for hip prosthesis |
AU2007323566A1 (en) | 2006-11-22 | 2008-05-29 | Sonoma Orthopedic Products, Inc. | Fracture fixation device, tools and methods |
US7857859B2 (en) * | 2007-06-13 | 2010-12-28 | Zimmer, Gmbh | Femur component for a hip joint prosthesis |
EP2299917A1 (en) | 2008-06-10 | 2011-03-30 | Sonoma Orthopedic Products, Inc. | Fracture fixation device, tools and methods |
EP2341857A2 (en) | 2008-09-26 | 2011-07-13 | Sonoma Orthopedic Products, Inc. | Bone fixation device, tools and methods |
WO2010059360A1 (en) * | 2008-10-30 | 2010-05-27 | Biomet Manufacturing Corporation | Modular implant for joint prosthesis |
CN101416907B (en) * | 2008-12-04 | 2012-09-05 | 北京纳通科技集团有限公司 | Artificial femur handle and artificial full hip-joint replacement prosthesis |
US20100241069A1 (en) | 2009-03-19 | 2010-09-23 | Abbott Cardiovascular Systems Inc. | Ostial lesion stent delivery system |
CN103841925B (en) | 2011-03-16 | 2017-02-15 | 史密夫和内修有限公司 | Compound angle implant |
JP5868695B2 (en) * | 2011-12-22 | 2016-02-24 | 京セラメディカル株式会社 | Artificial joint components |
US9770278B2 (en) | 2014-01-17 | 2017-09-26 | Arthrex, Inc. | Dual tip guide wire |
US9814499B2 (en) | 2014-09-30 | 2017-11-14 | Arthrex, Inc. | Intramedullary fracture fixation devices and methods |
DE102015202715B4 (en) * | 2015-02-13 | 2016-12-15 | Waldemar Link Gmbh & Co. Kg | Joint interim prosthesis |
Family Cites Families (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1409054A (en) * | 1971-09-24 | 1975-10-08 | Nat Res Dev | Hip joint prosthesis |
IE41443B1 (en) * | 1974-08-29 | 1980-01-02 | Charnley Surgical Inventions | Fermoral prosthesis |
US3965490A (en) * | 1974-11-14 | 1976-06-29 | Howmedica, Inc. | Femoral insert for hip joint prosthesis |
US4044403A (en) * | 1976-11-01 | 1977-08-30 | Howmedica, Inc. | Implantable joint prosthesis |
CH640406A5 (en) * | 1979-10-11 | 1984-01-13 | Sulzer Ag | Hip joint prosthesis. |
FR2472374B1 (en) * | 1979-12-24 | 1986-05-02 | Tornier Sa | IMPROVEMENTS ON THE FEMALE BASES OF TOTAL HIP PROSTHESES |
GB2069340B (en) * | 1980-02-15 | 1984-07-25 | Hardinge K | Bone joint replacement |
CH648748A5 (en) * | 1981-02-19 | 1985-04-15 | Sulzer Ag | STRAIGHT, LEAF-LIKE SHAFT OF A JOINT OPROTHESIS. |
US4516277A (en) * | 1981-12-08 | 1985-05-14 | Jean Butel | Article comprising and method for fabricating a hip prosthesis having a flexible multi-element femoral rod |
FR2528307B1 (en) * | 1982-06-14 | 1987-07-03 | Tornier Sa | IMPROVED HIP PROSTHESIS |
FR2529077B1 (en) * | 1982-06-29 | 1985-01-18 | Lord Gerald | NEW BONE PROSTHESIS AND ITS OBTAINMENT |
USRE32488E (en) * | 1982-09-28 | 1987-09-01 | Hip prosthesis | |
US5047062A (en) * | 1984-01-26 | 1991-09-10 | Pappas Michael J | Femoral stem-type prosthesis |
FR2576777B1 (en) * | 1985-01-31 | 1987-03-06 | Rhenter Jean Luc | TOTAL HIP PROSTHESIS WITH PRIMARY FIXING |
CA1290099C (en) * | 1986-01-21 | 1991-10-08 | Thomas H. Mallory | Porous-coated artificial joints |
US4714470A (en) * | 1986-02-19 | 1987-12-22 | Zimmer, Inc. | Grooved prosthetic implant |
FR2610823B1 (en) * | 1987-02-12 | 1997-01-24 | Cuilleron J | IMPROVED FEMALE ROD FOR HIP PROSTHESES |
US5013324A (en) * | 1987-08-24 | 1991-05-07 | Zimmer, Inc. | Prosthetic implant with wrapped porous surface |
US5197989A (en) * | 1987-09-03 | 1993-03-30 | Hinckfuss Bruce W | Two stage joint prosthesis |
CH674306A5 (en) * | 1988-01-14 | 1990-05-31 | Sulzer Ag | |
US4808186A (en) * | 1988-02-02 | 1989-02-28 | Boehringer Mannheim Corporation | Controlled stiffness femoral hip implant |
CH674307A5 (en) * | 1988-02-26 | 1990-05-31 | Sulzer Ag | |
CH675821A5 (en) * | 1988-08-23 | 1990-11-15 | Sulzer Ag | |
US4986834A (en) * | 1988-08-31 | 1991-01-22 | Boehringer Mannheim Corporation | Load sharing femoral hip implant |
CH676921A5 (en) * | 1988-10-27 | 1991-03-28 | Sulzer Ag | |
FR2639821B1 (en) * | 1988-12-07 | 1997-10-03 | Implants Instr Ch Fab | FEMALE ELEMENT FOR HIP PROSTHESIS |
EP0385585A1 (en) * | 1989-02-06 | 1990-09-05 | Stephen M. Horowitz, M.D. | A hip prosthesis and method for implanting the same |
US5002581A (en) * | 1989-11-03 | 1991-03-26 | Dow Corning Wright Corporation | Modular hip joint prosthesis with adjustable anteversion |
US5074879A (en) * | 1990-10-26 | 1991-12-24 | Pappas Michael J | Prosthetic device with modular stem |
US5007931A (en) * | 1990-05-04 | 1991-04-16 | Boehringer Mannheim Corporation | Porous coated prosthesis |
GB9011132D0 (en) * | 1990-05-17 | 1990-07-04 | Howmedica | Phosthetic intramedullary femoral prosthesis with preformed sheath |
US5080680A (en) * | 1990-09-04 | 1992-01-14 | Mikhail Michael W E | Femoral stem prosthesis with preapplied cement mantle |
US5171324A (en) * | 1990-11-05 | 1992-12-15 | Zimmer, Inc. | Prosthetic hip stem implant with torque adapter |
US5133766A (en) * | 1991-03-04 | 1992-07-28 | Halpern Alan A | Femoral head remodeling and femoral insert and drilling aid therefor |
US5152799A (en) * | 1991-10-04 | 1992-10-06 | Exactech, Inc. | Prosthetic femoral stem |
-
1992
- 1992-01-28 GB GB929201734A patent/GB9201734D0/en active Pending
-
1993
- 1993-01-21 DK DK93300412.9T patent/DK0554987T3/en active
- 1993-01-21 ES ES93300412T patent/ES2089714T3/en not_active Expired - Lifetime
- 1993-01-21 DE DE69303385T patent/DE69303385T2/en not_active Expired - Fee Related
- 1993-01-21 EP EP93300412A patent/EP0554987B1/en not_active Expired - Lifetime
- 1993-01-21 AT AT93300412T patent/ATE139896T1/en active
- 1993-01-22 AU AU31974/93A patent/AU654226B2/en not_active Ceased
- 1993-01-26 US US08/009,162 patent/US5458651A/en not_active Expired - Lifetime
- 1993-01-27 DE DE9301107U patent/DE9301107U1/de not_active Expired - Lifetime
- 1993-01-27 CA CA002088226A patent/CA2088226A1/en not_active Abandoned
- 1993-01-28 JP JP01269193A patent/JP3548188B2/en not_active Expired - Fee Related
-
1996
- 1996-08-02 GR GR960402073T patent/GR3020709T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP0554987B1 (en) | 1996-07-03 |
JP3548188B2 (en) | 2004-07-28 |
JPH06261919A (en) | 1994-09-20 |
DE69303385T2 (en) | 1996-10-31 |
ATE139896T1 (en) | 1996-07-15 |
ES2089714T3 (en) | 1996-10-01 |
GR3020709T3 (en) | 1996-11-30 |
US5458651A (en) | 1995-10-17 |
DE69303385D1 (en) | 1996-08-08 |
DK0554987T3 (en) | 1996-11-11 |
AU654226B2 (en) | 1994-10-27 |
DE9301107U1 (en) | 1993-05-27 |
EP0554987A1 (en) | 1993-08-11 |
GB9201734D0 (en) | 1992-03-11 |
AU3197493A (en) | 1993-07-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
FZDE | Discontinued |