WO1995017140A1 - Cup - Google Patents

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Publication number
WO1995017140A1
WO1995017140A1 PCT/SE1994/001233 SE9401233W WO9517140A1 WO 1995017140 A1 WO1995017140 A1 WO 1995017140A1 SE 9401233 W SE9401233 W SE 9401233W WO 9517140 A1 WO9517140 A1 WO 9517140A1
Authority
WO
WIPO (PCT)
Prior art keywords
cup
cavity
bead
bone tissue
outer side
Prior art date
Application number
PCT/SE1994/001233
Other languages
French (fr)
Inventor
Björn Albrektsson
Lars Carlsson
Magnus Jacobsson
Tord Röstlund
Stig Wennberg
Original Assignee
Astra Aktiebolag
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 Astra Aktiebolag filed Critical Astra Aktiebolag
Priority to AU13948/95A priority Critical patent/AU695430B2/en
Priority to DE69432717T priority patent/DE69432717T2/en
Priority to EP95905273A priority patent/EP0804130B1/en
Priority to US08/416,879 priority patent/US5702473A/en
Priority to CA002166803A priority patent/CA2166803C/en
Priority to DK95905273T priority patent/DK0804130T3/en
Priority to AT95905273T priority patent/ATE240699T1/en
Publication of WO1995017140A1 publication Critical patent/WO1995017140A1/en
Priority to FI960079A priority patent/FI960079A/en
Priority to NO960092A priority patent/NO307165B1/en

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
    • A61F2/30767—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
    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • 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, setting implements or the like
    • 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
    • A61F2/30767—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
    • 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
    • A61F2/3094—Designing or manufacturing processes
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4609—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of acetabular cups
    • 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
    • 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
    • A61F2002/30322—The prosthesis having different structural features at different locations within the same prosthesis differing in surface structures
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • 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
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • 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
    • A61F2002/30354—Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
    • 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
    • A61F2002/30362—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 with possibility of relative movement between the protrusion and the recess
    • A61F2002/30364—Rotation about the common longitudinal axis
    • A61F2002/30367—Rotation about the common longitudinal axis with additional means for preventing said rotation
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • 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
    • A61F2002/30378—Spherically-shaped protrusion and recess
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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
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    • 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
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—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
    • A61F2002/3085—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—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
    • A61F2002/3085—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
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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
    • A61F2/34—Acetabular cups
    • A61F2002/3453—Acetabular cups having a non-hemispherical convex outer surface, e.g. quadric-shaped
    • A61F2002/3466—Acetabular cups having a non-hemispherical convex outer surface, e.g. quadric-shaped having a cylindrical external shape, e.g. entirely cylindrical
    • 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
    • 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
    • A61F2250/0026—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 surface structures
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • 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
    • A61F2310/00179—Ceramics or ceramic-like structures
    • 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
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00796—Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Definitions

  • the present invention relates to a cup-shaped member for a hip joint prosthesis for implantation into a cavity in the bone tissue in the acetabulum, comprising an acetabular cup made of metal, a ceramic or any other suitable material, preferably of titanium, the outside of said cup to be implanted in the bone tissue being rotationally symmetrical around a central axis of symmetry.
  • the joints normally comprise one femoral part which is intended to be inserted or implanted into the femur and which carries a ball-shaped articulation element, normally made of metal or a ceramic material.
  • the joint further normally comprises a cup-shaped member, i. e. an acetabular cup, which is to be inserted into or attached to the acetabulum, and which is to hold a complementary, cup- shaped liner, normally made of Ultra High Molecular Weight Polyethylene (UHMWPE) or a similar polymer material, in which the ball-shaped element is to articulate or rotate.
  • UHMWPE Ultra High Molecular Weight Polyethylene
  • the depth of the bone tissue which is available in the acetabulum for attaching the acetabular cup is limited in most directions.
  • the acetabular cup per se is furthermore rather flat and shallow, which means that the cup at least to some extent may be considered to be more or less placed directly onto the surface of the bone tissue and not into the bone tissue, this in contrast to most other commonly used bone implants, such as screw-shaped dental implants or standard femoral implants.
  • a metal which is commonly used in bone implants is titanium because of its proven affinity with bone tissue and its good biocompability.
  • One particular property of titanium is its tendency to form a close connection with bone tissue. The formation of this close connection is often termed "osseointegration".
  • One factor which may be important for a proper ossseointegration process is a relatively good fit between implant and bone tissue, another a relative immobility between implant and bone tissue.
  • the object of the present invention is to provide an acetabular cup which provides conditions favourable to the osseointegration process by influencing the factors described above and which conseguently provides a cup which will be firmly attached to the bone tissue.
  • the outer side of the cup that is the side which is to face the bone tissue, is provided with at least one circumferentially oriented bead close to the edge of the cup-shaped element, said bead having a barb-like shape in section and consequently allowing the cup-shaped element to be pushed into said cavity but counter-acting the removal of said cup-shaped element from said cavity, said outer side including said bead(s) being provided with a rough structure serving as a file or saw when said cup is pushed and/or rotated into said cavity.
  • Fig 1 shows a side view of an acetabular cup according to the invention
  • Fig 2 shows a view of the cup of Fig 1 Fig 3 a section along the line III - III in
  • Fig 4 shows a perspective view of the cup
  • the cup-shaped member comprises an acetabular cup 1 which is shown in detail in figs 1 - 3.
  • the cup 1 is intended to hold a complementary liner which may be attached to the cup according to any standard procedure or by any standard means.
  • the cup comprises two main parts, one spherical segment
  • the circumferential bead which is in the form of a thread 5.
  • the forward side or flank 6 of the thread 5 forms an acute angle with the surface of the cylindrical part of the cup, i. e. the longitudinal orientation thereof, whereas the backward edge or flank 7 is more or less perpendicular to said surface of the cup.
  • the pitch D of the thread may be about 2 mm and the height H about 1 mm in a normal sized cup. In this way the thread in section will have the shape of a barb or a saw tooth.
  • the threads do not have to run around the entire periphery of the cylindrical part 3 and may for instance be broken by means of axial gaps 8 spaced equidistantly around the periphery.
  • the entire outer surface of the cup, including the cylindrical part 3 and the threads 5, is roughened.
  • the rough structure should have relatively sharp edges so as to be able to function in a manner similar to a file.
  • a suitable way of obtaining this roughness is by blasting the surface with AI2O3 having a particle size of about 0,25 mm at a pressure of 3 - 6 bar. It is also conceivable to use particles of TiO ⁇ .
  • the free edge of the cylindrical part is also provided with a projecting lug 4, which may be used to lock the liner against rotation in the cup when the hip joint prosthesis actually is in use and the above-mentioned ball-shaped member on the femoral part of the prosthesis moves in the liner.
  • a cavity is cut in the bone tissue in the acetabulum.
  • the shape of this cavity corresponds closely to the outer surface of the cup apart from the threads.
  • the diameter of the cavity preferably is about 1 mm smaller than the diameter of the core part of the cylindrical part of the cup, i. e. about 1 mm smaller than the diameter as measured from the tips of the threads 5.
  • the cup is then gently tapped as far into the cavity as possible.
  • the cup will now be held in the cavity by means of the threads, which will be pressed into the walls of the cavity.
  • the inward movement of the cup in the cavity will result in that the roughness on the exterior of the cup will act as a file, to some extent shaping the cavity after the shape of the cup. Some scraped-off bone tissue will also be deposited into the roughness.
  • the cup now may be turned, for instance a quarter of a turn in the cavity by means of a tool engaging the lug 4.
  • This rotation of the cup has four important aspects, which each one is important per se, but which are most advantageous in combination.
  • the first aspect is that the rough structure on the surface again will act as a file on the inner surface of the cavity and thereby, if necessary, shape the cavity to conform exactly to the shape of the cup.
  • the second aspect is that the thread, which also will act as a file, will cut an inner thread on the inner surface of the cavity, by which means the cup will be held still more securely.
  • the scraped-off bone tissue will be collected in the irregularities on the surface in both these cases.
  • the third aspect is that the cup will be screwed inwards by into the cavity by means of the threads which are being cut, which means that the cup will be pressed inwards against the surface of the cavity.
  • the fourth aspect is that, as mentioned above, the irregularities on the surface will be filled with scraped off bone tissue which will promote the growth of newly formed bone tissue into the irregularities.
  • the cylindrical part of the cup will tend to stabilize the cup in the cavity since it will counteract any tendencies of the cup to rotate out of the cavity by a lateral sliding movement along the respective spherical surfaces of cup and cavity.
  • the cylindrical part will also offer a larger attachment area along the edge of the cup, i. e. that part at which the forces from the bone tissue being a result from the fact that the cup is forced into the cavity are oriented perpendicularly relative to the axis of symmetry of the cup.
  • the threads on the exterior of the cylindrical part of the cup have the advantage that the cup easily may be unscrewed without damaging the cavity in the acetabulum, should the cup happen to be canted during the insertion process.
  • the beads or threads do not have to be unbroken around the entire periphery of the cup and may for instance be in the form of one or several series of relatively short sections.
  • the roughness on the outer surface of the cup of course can be obtained in any suitable way resulting in relatively sharp-edged irregularities. Alternative methods might for instance be etching, mechanical scoring or cutting and possibly plasmaspraying.
  • the roughness on the surface also could be obtained by providing the surface with a rough layer of some other material than the material in the cup, such as a plasmaprayed layer of hydroxy-apatite.
  • the additional layer advantageously might be an osseointegration promoting or growth-stimulating material.
  • the rough surface also could be provided with a thin layer of, or be treated with, a growth-stimulating agent.
  • the cup of course also can be provided witn additional fastening means, such as holes for bone screws, should the prevailing conditions be such as to require this.
  • the cup can be provided with other suitable tool- engaging means for the rotation of the cup than the lug described in the preferred embodiment. It should also be noted that the quarter turn of the cup described in connection with the preferred embodiment is only given as an example and that other rotation angles are possible.

Abstract

The invention relates to a cup-shaped member for a hip joint prosthesis, for implantation into a cavity in the bone tissue in the acetabulum, comprising an acetabular cup (1) made of metal, a ceramic material or any other suitable material, preferably of titanium, the outside of said cup being rotationally symmetrical around a central axis of symmetry. The outer side of the cup (1), that is the side which is to face the bone tissue, is provided with at least one circumferential bead (5) close to the edge of the cup (1), said bead (5) having a barb-like shape in section and consequently allowing the cup (1) to be pushed into said cavity but counteracting the removal of said cup (1) from said cavity, said outer side including said bead(s) (5) being provided with a rough structure serving as a file when said cup (1) is moved or rotated in said cavity.

Description

cup
Technical field of the invention
The present invention relates to a cup-shaped member for a hip joint prosthesis for implantation into a cavity in the bone tissue in the acetabulum, comprising an acetabular cup made of metal, a ceramic or any other suitable material, preferably of titanium, the outside of said cup to be implanted in the bone tissue being rotationally symmetrical around a central axis of symmetry.
Background to the invention
Artificial hip joints have been used and implanted into humans for a long period of time. The joints normally comprise one femoral part which is intended to be inserted or implanted into the femur and which carries a ball-shaped articulation element, normally made of metal or a ceramic material. The joint further normally comprises a cup-shaped member, i. e. an acetabular cup, which is to be inserted into or attached to the acetabulum, and which is to hold a complementary, cup- shaped liner, normally made of Ultra High Molecular Weight Polyethylene (UHMWPE) or a similar polymer material, in which the ball-shaped element is to articulate or rotate.
The depth of the bone tissue which is available in the acetabulum for attaching the acetabular cup is limited in most directions. The acetabular cup per se is furthermore rather flat and shallow, which means that the cup at least to some extent may be considered to be more or less placed directly onto the surface of the bone tissue and not into the bone tissue, this in contrast to most other commonly used bone implants, such as screw-shaped dental implants or standard femoral implants. These factors make it difficult to design an acetabular cup that easily will be attached to the bone tissue by means of the shape of the cup or to design efficient attachment means for the cup.
Some prior art acetabular cups are disclosed in for instance DE-A- 24 54 635, DE-A-26 45 101, US-A- 3,903,549 and US-A-4,795,470.
A metal which is commonly used in bone implants is titanium because of its proven affinity with bone tissue and its good biocompability. One particular property of titanium is its tendency to form a close connection with bone tissue. The formation of this close connection is often termed "osseointegration". One factor which may be important for a proper ossseointegration process is a relatively good fit between implant and bone tissue, another a relative immobility between implant and bone tissue.
The object of the present invention is to provide an acetabular cup which provides conditions favourable to the osseointegration process by influencing the factors described above and which conseguently provides a cup which will be firmly attached to the bone tissue.
Brief description of the inventive concept.
This object is achieved in that the outer side of the cup, that is the side which is to face the bone tissue, is provided with at least one circumferentially oriented bead close to the edge of the cup-shaped element, said bead having a barb-like shape in section and consequently allowing the cup-shaped element to be pushed into said cavity but counter-acting the removal of said cup-shaped element from said cavity, said outer side including said bead(s) being provided with a rough structure serving as a file or saw when said cup is pushed and/or rotated into said cavity.
Further advantageous embodiments are set forth in the dependent claims.
Short description of the appended drawings
Fig 1 shows a side view of an acetabular cup according to the invention
Fig 2 shows a view of the cup of Fig 1 Fig 3 a section along the line III - III in
Fig 2,
Fig 4 shows a perspective view of the cup and
Fig 5 details of the thread.
Detailed description of a preferred embodiment of the invention.
In this preferred embodiment the cup-shaped member comprises an acetabular cup 1 which is shown in detail in figs 1 - 3. The cup 1 is intended to hold a complementary liner which may be attached to the cup according to any standard procedure or by any standard means.
The cup comprises two main parts, one spherical segment
2 and a cylindrical part 3 adjoining the edge of the spherical segment. The outside of the cylindrical part
3 is provided with a circumferential bead which is in the form of a thread 5. The forward side or flank 6 of the thread 5 forms an acute angle with the surface of the cylindrical part of the cup, i. e. the longitudinal orientation thereof, whereas the backward edge or flank 7 is more or less perpendicular to said surface of the cup. The pitch D of the thread may be about 2 mm and the height H about 1 mm in a normal sized cup. In this way the thread in section will have the shape of a barb or a saw tooth. When the cup is pushed into a cavity in the bone tissue, the thread consequently will allow the cup to be moved into the cavity but will prevent the cup to be moved out from the cavity.
The threads do not have to run around the entire periphery of the cylindrical part 3 and may for instance be broken by means of axial gaps 8 spaced equidistantly around the periphery.
The entire outer surface of the cup, including the cylindrical part 3 and the threads 5, is roughened. The rough structure should have relatively sharp edges so as to be able to function in a manner similar to a file. A suitable way of obtaining this roughness is by blasting the surface with AI2O3 having a particle size of about 0,25 mm at a pressure of 3 - 6 bar. It is also conceivable to use particles of TiO^.
The free edge of the cylindrical part is also provided with a projecting lug 4, which may be used to lock the liner against rotation in the cup when the hip joint prosthesis actually is in use and the above-mentioned ball-shaped member on the femoral part of the prosthesis moves in the liner.
When the cup is to be mounted, a cavity is cut in the bone tissue in the acetabulum. The shape of this cavity corresponds closely to the outer surface of the cup apart from the threads. The diameter of the cavity preferably is about 1 mm smaller than the diameter of the core part of the cylindrical part of the cup, i. e. about 1 mm smaller than the diameter as measured from the tips of the threads 5. The cup is then gently tapped as far into the cavity as possible. The cup will now be held in the cavity by means of the threads, which will be pressed into the walls of the cavity. The inward movement of the cup in the cavity will result in that the roughness on the exterior of the cup will act as a file, to some extent shaping the cavity after the shape of the cup. Some scraped-off bone tissue will also be deposited into the roughness.
The cup now may be turned, for instance a quarter of a turn in the cavity by means of a tool engaging the lug 4. This rotation of the cup has four important aspects, which each one is important per se, but which are most advantageous in combination.
The first aspect is that the rough structure on the surface again will act as a file on the inner surface of the cavity and thereby, if necessary, shape the cavity to conform exactly to the shape of the cup.
The second aspect is that the thread, which also will act as a file, will cut an inner thread on the inner surface of the cavity, by which means the cup will be held still more securely. The scraped-off bone tissue will be collected in the irregularities on the surface in both these cases.
The third aspect is that the cup will be screwed inwards by into the cavity by means of the threads which are being cut, which means that the cup will be pressed inwards against the surface of the cavity.
The fourth aspect is that, as mentioned above, the irregularities on the surface will be filled with scraped off bone tissue which will promote the growth of newly formed bone tissue into the irregularities.
The cylindrical part of the cup will tend to stabilize the cup in the cavity since it will counteract any tendencies of the cup to rotate out of the cavity by a lateral sliding movement along the respective spherical surfaces of cup and cavity. The cylindrical part will also offer a larger attachment area along the edge of the cup, i. e. that part at which the forces from the bone tissue being a result from the fact that the cup is forced into the cavity are oriented perpendicularly relative to the axis of symmetry of the cup.
The threads on the exterior of the cylindrical part of the cup have the advantage that the cup easily may be unscrewed without damaging the cavity in the acetabulum, should the cup happen to be canted during the insertion process.
The invention of course can be varied in many ways within the scope of the appended claims. It should for instance be noted that the beads or threads do not have to be unbroken around the entire periphery of the cup and may for instance be in the form of one or several series of relatively short sections.
The roughness on the outer surface of the cup of course can be obtained in any suitable way resulting in relatively sharp-edged irregularities. Alternative methods might for instance be etching, mechanical scoring or cutting and possibly plasmaspraying. The roughness on the surface also could be obtained by providing the surface with a rough layer of some other material than the material in the cup, such as a plasmaprayed layer of hydroxy-apatite. The additional layer advantageously might be an osseointegration promoting or growth-stimulating material. The rough surface also could be provided with a thin layer of, or be treated with, a growth-stimulating agent.
The cup of course also can be provided witn additional fastening means, such as holes for bone screws, should the prevailing conditions be such as to require this.
The cup can be provided with other suitable tool- engaging means for the rotation of the cup than the lug described in the preferred embodiment. It should also be noted that the quarter turn of the cup described in connection with the preferred embodiment is only given as an example and that other rotation angles are possible.

Claims

1. Cup-shaped member for a hip joint prosthesis, for implantation into a cavity in the bone tissue in the acetabulum, comprising an acetabular cup (1) made of metal, a ceramic material or any other suitable material, preferably of titanium, the outside of said cup to be located in the bone tissue being rotationally symmetrical around a central axis of symmetry, c h a r a c t e r i z e d in that the outer side of the cup (1) , that is the side which is to face the bone tissue, is provided with at least one circumferentially oriented bead (5) close to the edge of the cup (1) , said bead (5) having a barb-like shape in section and consequently allowing said cup (1) to be pushed into said cavity but counter-acting the removal of said cup (1) from said cavity, said outer side including said bead(s) (5) being provided with a rough structure serving as a file when said cup (1) is moved or rotated in said cavity.
2. Cup according to claim 1, c h a r a c t e r i z e d in the forward edge (6) of said barb-shaped bead (5) forms an acute angle with the surface of said cup (1) and in that the backward edge (6) is substantially perpendicular to said surface.
3. Cup according to claim 1 or 2, c h a r a c t e r i z e d in that said outer side is blasted in order to obtain said roughness, for instance by means of particles of TiC^ or of Al^O .
4. Cup according to anyone of claims 1 - 3, c h a r a c t e r i z e d in that said circumferential bead (5) is in the form of at least one thread.
5. Cup according to anyone of claims 1 - 4, c h a r a c t e r i z e d in that said beads (5) or threads are located on a cylindrical part (3) of said cup (1) .
6. Cup according to any one of the preceding claims, c h a r a c t e r i z e d in that said beads are in the form of one or several series of sections, each section being shorter than the entire circumference of the respective part of the cup.
7. Cup according to claim 6, c h a r a c t e r i z e d in that said sections are separated by gaps (8) extending longitudinally, i.e. in parallel with the axis of the cylindrical part, through the entire beaded part.
PCT/SE1994/001233 1993-12-23 1994-12-21 Cup WO1995017140A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AU13948/95A AU695430B2 (en) 1993-12-23 1994-12-21 Cup
DE69432717T DE69432717T2 (en) 1993-12-23 1994-12-21 socket
EP95905273A EP0804130B1 (en) 1993-12-23 1994-12-21 Cup
US08/416,879 US5702473A (en) 1993-12-23 1994-12-21 Cup
CA002166803A CA2166803C (en) 1993-12-23 1994-12-21 Cup
DK95905273T DK0804130T3 (en) 1993-12-23 1994-12-21 Cup
AT95905273T ATE240699T1 (en) 1993-12-23 1994-12-21 JOINT POCKET
FI960079A FI960079A (en) 1993-12-23 1996-01-08 Cup
NO960092A NO307165B1 (en) 1993-12-23 1996-01-09 Acetabula cup as part of hip joint prosthesis

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9304281-0 1993-12-23
SE9304281A SE9304281D0 (en) 1993-12-23 1993-12-23 CUP

Publications (1)

Publication Number Publication Date
WO1995017140A1 true WO1995017140A1 (en) 1995-06-29

Family

ID=20392207

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1994/001233 WO1995017140A1 (en) 1993-12-23 1994-12-21 Cup

Country Status (13)

Country Link
US (1) US5702473A (en)
EP (1) EP0804130B1 (en)
AT (1) ATE240699T1 (en)
AU (1) AU695430B2 (en)
CA (1) CA2166803C (en)
DE (1) DE69432717T2 (en)
DK (1) DK0804130T3 (en)
ES (1) ES2199979T3 (en)
FI (1) FI960079A (en)
NO (1) NO307165B1 (en)
NZ (1) NZ278459A (en)
SE (1) SE9304281D0 (en)
WO (1) WO1995017140A1 (en)

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WO1998033441A1 (en) * 1997-01-31 1998-08-06 Astra Aktiebolag Bone reamer for sharping bone sockets or cavities during orthopaedic surgery
FR2770769A1 (en) * 1997-11-07 1999-05-14 Orthotechnique Acetabular cup prosthesis for hip surgery
FR2783703A1 (en) * 1998-09-24 2000-03-31 Philippe Bauchu Joint cup anchorage for prosthetic hip joint uses toothed rings round rim of hemispherical cup, and lug with screw fastening
EP1025815A1 (en) * 1999-02-04 2000-08-09 Sulzer Orthopedics Ltd. Artificial acetabular cup
WO2001085068A1 (en) * 2000-05-08 2001-11-15 Universität Heidelberg Endoprosthesis part for use in joint replacement, use of the same and production method therefor
FR2858209A1 (en) * 2003-07-30 2005-02-04 Depuy France ACETABULAR IMPLANT AND METHOD OF MANUFACTURING THE IMPLANT
US9445904B2 (en) 2009-07-14 2016-09-20 Biomet Manufacturing, Llc Multiple bearing acetabular prosthesis
US9445903B2 (en) 2008-11-24 2016-09-20 Biomet Manufacturing, Llc Multi-bearing acetabular prosthesis

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US6425922B1 (en) 2000-01-30 2002-07-30 Diamicron, Inc. Prosthetic hip joint having at least one sintered polycrystalline diamond compact articulation surface
US6290726B1 (en) 2000-01-30 2001-09-18 Diamicron, Inc. Prosthetic hip joint having sintered polycrystalline diamond compact articulation surfaces
US6596225B1 (en) 2000-01-31 2003-07-22 Diamicron, Inc. Methods for manufacturing a diamond prosthetic joint component
US6402787B1 (en) 2000-01-30 2002-06-11 Bill J. Pope Prosthetic hip joint having at least one sintered polycrystalline diamond compact articulation surface and substrate surface topographical features in said polycrystalline diamond compact
US6494918B1 (en) 2000-01-30 2002-12-17 Diamicron, Inc. Component for a prosthetic joint having a diamond load bearing and articulation surface
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NO960092D0 (en) 1996-01-09
NO307165B1 (en) 2000-02-21
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CA2166803C (en) 2004-02-10
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DK0804130T3 (en) 2003-09-15
AU1394895A (en) 1995-07-10
FI960079A0 (en) 1996-01-08
EP0804130B1 (en) 2003-05-21
AU695430B2 (en) 1998-08-13
NO960092L (en) 1996-01-31
DE69432717D1 (en) 2003-06-26
FI960079A (en) 1996-01-08
ES2199979T3 (en) 2004-03-01
EP0804130A1 (en) 1997-11-05
ATE240699T1 (en) 2003-06-15
US5702473A (en) 1997-12-30
SE9304281D0 (en) 1993-12-23
CA2166803A1 (en) 1995-06-29

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