WO2009147395A2 - Cotyle prothétique - Google Patents

Cotyle prothétique Download PDF

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Publication number
WO2009147395A2
WO2009147395A2 PCT/GB2009/001396 GB2009001396W WO2009147395A2 WO 2009147395 A2 WO2009147395 A2 WO 2009147395A2 GB 2009001396 W GB2009001396 W GB 2009001396W WO 2009147395 A2 WO2009147395 A2 WO 2009147395A2
Authority
WO
WIPO (PCT)
Prior art keywords
passage
acetabular cup
rim
cup
extends
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB2009/001396
Other languages
English (en)
Other versions
WO2009147395A3 (fr
Inventor
Simon Nicholas 18 Star Lane Avening Tetbury Gloucestershire GL8 8NT United Kingdom COLLINS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Corin Ltd
Original Assignee
Corin Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Corin Ltd filed Critical Corin Ltd
Publication of WO2009147395A2 publication Critical patent/WO2009147395A2/fr
Publication of WO2009147395A3 publication Critical patent/WO2009147395A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • 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
    • A61F2/30744—End caps, e.g. for closing an endoprosthetic cavity
    • 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 for implanting artificial joints
    • A61F2/4603—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4609—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof of 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
    • 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
    • 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
    • A61F2002/30594—Special structural features of bone or joint prostheses not otherwise provided for slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
    • A61F2002/30688—Means for allowing passage or sliding of tendons or ligaments
    • 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
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/3079—Stepped or enlarged apertures, e.g. having discrete diameter changes
    • 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
    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • A61F2002/308—Blind bores, e.g. of circular cross-section oblong
    • 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
    • A61F2002/3082—Grooves
    • A61F2002/30823—Grooves having the shape of a reverse dovetail
    • 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
    • A61F2002/3445—Acetabular cups having a number of shells different from two
    • A61F2002/3446—Single 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
    • A61F2/34—Acetabular cups
    • A61F2002/3469—Acetabular cups with non-radial inner bores or canals

Definitions

  • the present invention relates to an acetabular cup.
  • An acetabular cup for a hip prosthesis is well known.
  • attachment of an acetabular cup to a patient's acetabulum often requires additional fixation means, such as screw-threaded fasteners, whilst bone growth onto an outer fixation surface of the cup occurs.
  • additional fixation means such as screw-threaded fasteners
  • MOM metal-on-metal
  • dysplasia acetabular device these generally have limited cup wall thickness for securely fastening the cup in place.
  • Fasteners cannot typically therefore extend through the cup wall and project perpendicularly from the cup as this affects the wear and lubrication performance of the prosthesis.
  • the present invention seeks to provide solutions to these problems.
  • an acetabular cup comprising an inner articulating surface having a polar axis, an arcuate outer surface, an annular rim therebetween, and at least one elongate passage which extends from the rim to the outer surface, a longitudinal extent of the said at least one passage extending in a direction which is non-parallel with the polar axis.
  • an acetabular cup comprising an inner articulating surface, an. arcuate outer surface, an annular rim therebetween, and at least one elongate passage which extends from the rim to the outer surface, the said at least one passage at least in part defining a slot in the outer surface.
  • Figure 1 is a perspective view of one embodiment of an acetabular cup, in accordance with the present invention.
  • Figure 2 is a side view of the acetabular cup
  • Figure 3 is an enlarged view of a passage of the cup showing a fastener received therein.
  • an acetabular cup 10 which comprises a part- circular outer surface 12 suitably dimensioned to fit a reamed acetabular opening of a patient, a part-circular, typically hemispherical or substantially hemispherical, inner articulating surface 14 adapted to receive a prosthetic femoral head, and an annular rim 16 which extends between the outer surface 12 and the articulating surface 14.
  • the outer surface 12 is part-circular, it may be shaped such that the equatorial diameter of the outer surface at the rim 16 is marginally greater than the polar diameter of the outer surface which extends perpendicularly to the equatorial diameter. This shape is beneficial to aid press-fit and uncemented fixation of the cup 10 into a patient's acetabulum, which is generally reamed to the smaller polar diameter dimension.
  • a surface of the rim 16 preferably includes a radiused portion 18 which extends in a lateral direction of the rim 16 between the outer surface 12 and the articulating surface 14.
  • the radiused portion 18 may extend across the entire lateral extent of the rim 16, or only across part thereof. In the former case, the rim 16 is thus fully non-planar, whereas in the latter case, the rim 16 has a planar portion and a non-planar portion.
  • only a portion of the rim 16 in a circumferential direction may be radiused.
  • a radius of the rim 16 is preferably in a range of 0.5 millimetre (mm) to 5 mm.
  • the radiused portion 18 prevents irritation of the iliopsoas muscle, should the rim 16 of the cup 10 project from the patient's acetabular surface.
  • the cup 10 is formed of, typically forged or cast, metal, and preferably high carbon cobalt chrome-alloy or titanium and may be subjected to a heat treatment process to improve its mechanical properties. However, it could be formed of a ceramic material, such as alumina, zirconia, or a combination thereof.
  • the outer surface 12 of the cup 10 is also preferably coated with Titanium plasma and/or Hydroxyapatite, to aid fixation and bone growth.
  • the rim 16 is formed with three equi-angularly spaced introducer recesses 20 which have an elongate longitudinal extent extending in a circumferential direction of the rim 16, and a relatively shallow depth.
  • the recesses 20 are bottomed and are spaced from both the articulating surface 14 and the outer surface 12.
  • the introducer recesses 20 enable releasable engagement of the cup 10 with an introducer tool, and are optional dependent upon necessity.
  • a plurality of rectilinear elongate passages 22 is also provided in a wall of the cup 10, extending from the rim 16 to the outer surface 12. Openings 24 to the passages 22 are equi-angularly spaced around the rim 16 and are positioned either side of each introducer recess 20. Although in this embodiment six of the passages 22 are provided, any number of passages 22 is feasible, including only one.
  • Each passage 22 has an elongate longitudinal extent and a generally cylindrical bore.
  • the longitudinal extent is non-parallel with a polar axis 26 of the articulating surface 14, so that the passage 22 passes through a reasonable amount of the wall of the cup 10.
  • the longitudinal extent of each passage 22 is provided in a converging direction relative to the polar axis 26.
  • a plane of the polar axis 26 can be oriented to include a longitudinal axis of at least one of the passages 22.
  • An included angle between the polar axis 26 and the longitudinal extent of each passage 22 is preferably in a range of 1 degree to 30 degrees, and is more preferably 15 degrees.
  • the longitudinal axis 22 may not be in a converging direction with the polar axis 26. This orientation would simplify access to the passage(s) for a surgeon, once the cup 10 had been positioned in a patient's reamed acetabulum, due to the angles of offset of the cup 10 relative to the vertical and coronal planes.
  • Each passage 22 is spaced from the articulating surface 14 of the cup 10, and an opening 28 to the passage 22 on the outer surface 12 is spaced from the rim 16 and the corresponding opening 24 thereon.
  • the passage opening 24 on the rim 16 may be formed on the radiused portion 18, in which case the opening 24 is non-circular. If the rim 16 is planar, then the opening 24 would be circular.
  • the opening 24 on the outer surface 12 is substantially an ellipse, due to the curvature of the outer surface 12.
  • Each passage 22 of this embodiment is an enclosed passage with an opening 24, 28 at each end.
  • the passage may be open along its entire longitudinal extent or at least part of its longitudinal extent.
  • a slot 29 is thus defined by the passage in the outer surface.
  • the slot 29 may extend from either the opening on the rim, the opening on the outer surface, or from both openings.
  • the slot 29 provides a restricted opening to the passage.
  • a lateral cross-section of the passage is or is substantially 'C shaped.
  • the fastener may be a surgical staple.
  • the passage comprises a relatively shallow elongate rectangular or substantially rectangular recess formed in the rim, and a first narrow bore for receiving a prong of the staple.
  • a secondary passage having a second narrow bore extends from the bottom of the recess to the outer surface. The first and second narrow bores are straight and, preferably, extend in parallel with each other.
  • the acetabular cup 10 may comprise retaining means for preventing or inhibiting a fastener 30 from backing out of the passage 22.
  • the passage 22 includes an enlarged bore portion 32 which extends from the rim 16 to receive a head 34 of the fastener 30.
  • the retaining means includes a notch or ridge 36 formed partway down the enlarged bore portion 32. Once an edge of the head 34 of the fastener 30 engages with the notch or passes over the ridge 36, backing out of the passage 22 is prevented or inhibited.
  • a circlip device can be utilised which, once the fastener is fully received in the passage, is placed above the head of the fastener and expands into the notch to prevent the fastener backing out.
  • the enlarged bore portion of the passage may include a frusto-conical surface.
  • the head of the fastener also includes a complementary surface. A taper-fit or Morse taper is thus formed by which a head of the fastener can be wedgingly engaged in the passage.
  • a blanking plug can be provided in the or each opening on the rim of the cup and above the respective fastener to seal the passage and prevent foreign objects and/or bodily fluid or other matter from passing therethrough.
  • the opening on the rim to a passage may break out onto the outer surface of the cup. This would be advantageous in the event that a wall thickness of the cup, particularly at the rim, was insufficient to easily accommodate the entire diameter of the head of a fastener. This would result in the slot extending from the opening on the rim at least partway along the outer surface, and thus forming the above-described restricted opening to the passage.
  • the lateral cross-sectional shape of the passage at and adjacent to the opening on the rim is generally C-shaped.
  • the head of the fastener when accommodated in the passage, may have a part which is thus slightly proud of the outer surface.
  • the remainder of the passage may either be fully enclosed within the wall thickness of the cup, until it opens out at its end onto the outer surface, or may include the slot as described above which thus would extend to or substantially to the end of the passage on the outer surface.
  • the shaft of the fastener which may be for example screw-threaded, may have part of its lateral extent which projects through the slot and is thus proud of the outer surface.
  • the passages may be parallel or non-parallel to the polar axis of the articulating surface of the cup.
  • the passages need not necessarily be rectilinear or straight.
  • One, more or all of the passages may be curved or arcuate along their longitudinal extents.
  • the fasteners would be formed of a flexible material, such as Nickel Titanium alloy (Nitinol). This would be advantageous to allow not only ease of access for a surgeon in inserting and securing the fasteners, but also being able to more accurately place the openings of the passages on the outer surface directly adjacent to good density bone of a patient, resulting in more reliable fixation.
  • the problem associated with revision and the releasing of the fasteners can be addressed by the use of resorbable material for the fasteners.
  • the resorbable material is typically a polymer, and may be for example PLLA, PCA, or PGA.
  • passages are applied to an equatorially expanded cup having a non-uniform wall thickness, then it is advantageous to provide one or more passages in a thicker part of the wall.
  • the present invention is particularly, but not exclusively, beneficial for use with thin walled acetabular components, such as monoblock large diameter metal-on-metal (MOM) articulations and dysplasia components where there is difficulty in achieving primary fixation with conventional bone screws in addition to cementless fixation.
  • MOM metal-on-metal
  • the cup may be a multi-part component, for example utilising one or more liner options to accommodate wear couplings formed from materials, such as metal, polyethylene and ceramic.
  • an acetabular cup which enables fixation by a separate fastener through the rim of the cup.
  • the passage of the fastener extends at an angle which is non-parallel with a polar axis of the cup.
  • the passage may break out onto the outer surface, either for part or all of its longitudinal extent, and therefore may be parallel or non-parallel with the polar axis of the cup.
  • a patient's acetabulum can be reamed in standard hemispherical fashion and the cup can be fixed directly to the reamed acetabulum surface.

Landscapes

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

Abstract

L'invention porte sur un cotyle prothétique (10), qui comprend : i) une surface d'articulation interne (14) ayant un axe polaire (26), une surface externe arquée (12), un rebord annulaire (16) entre celles-ci, et au moins un passage allongé (22) qui s'étend à partir du rebord (16) vers la surface externe (12). Une étendue longitudinale dudit ou desdits passages (22) s'étend dans une direction qui est non parallèle à l'axe polaire (26) ; ii) une surface d'articulation interne (14), une surface externe arquée (12), un rebord annulaire (16) entre elles, et au moins un passage allongé (22) qui s'étend à partir du rebord (16) vers la surface externe (12). Ledit ou lesdits passages (22) définissent au moins en partie une fente (29) dans la surface externe (12).
PCT/GB2009/001396 2008-06-05 2009-06-03 Cotyle prothétique Ceased WO2009147395A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0810284.0 2008-06-05
GB0810284.0A GB2460684B (en) 2008-06-05 2008-06-05 Acetabular cup

Publications (2)

Publication Number Publication Date
WO2009147395A2 true WO2009147395A2 (fr) 2009-12-10
WO2009147395A3 WO2009147395A3 (fr) 2010-01-28

Family

ID=39638222

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2009/001396 Ceased WO2009147395A2 (fr) 2008-06-05 2009-06-03 Cotyle prothétique

Country Status (2)

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GB2477981A (en) * 2010-02-22 2011-08-24 Corin Ltd Acetabular cup with bores to allow release of trapped fluid

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DE10003543A1 (de) * 2000-01-27 2001-08-02 Klaus Draenert Pressfit Cup mit Dämpfungseigenschaften
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GB2460684B (en) 2013-02-20
GB2460684A (en) 2009-12-09
GB0810284D0 (en) 2008-07-09
WO2009147395A3 (fr) 2010-01-28

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