WO1997017040A1 - Künstliche hüftgelenkpfanne - Google Patents

Künstliche hüftgelenkpfanne Download PDF

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Publication number
WO1997017040A1
WO1997017040A1 PCT/CH1996/000395 CH9600395W WO9717040A1 WO 1997017040 A1 WO1997017040 A1 WO 1997017040A1 CH 9600395 W CH9600395 W CH 9600395W WO 9717040 A1 WO9717040 A1 WO 9717040A1
Authority
WO
WIPO (PCT)
Prior art keywords
acetabular cup
outer shell
edge
cup according
shell
Prior art date
Application number
PCT/CH1996/000395
Other languages
English (en)
French (fr)
Inventor
Aykut Suemer
Original Assignee
Emcc Engineering Manufacturing Consulting Corporation Ag
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 Emcc Engineering Manufacturing Consulting Corporation Ag filed Critical Emcc Engineering Manufacturing Consulting Corporation Ag
Priority to DE59607461T priority Critical patent/DE59607461D1/de
Priority to AT96934307T priority patent/ATE203884T1/de
Priority to US09/068,408 priority patent/US6136033A/en
Priority to AU72761/96A priority patent/AU7276196A/en
Priority to EP96934307A priority patent/EP0859578B1/de
Publication of WO1997017040A1 publication Critical patent/WO1997017040A1/de

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • 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
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/3094—Designing or manufacturing processes
    • A61F2/30965—Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
    • 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
    • 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
    • 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
    • A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
    • A61F2002/30324—The prosthesis having different structural features at different locations within the same prosthesis differing in thickness
    • A—HUMAN NECESSITIES
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    • 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
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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
    • A61F2002/30329—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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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
    • 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
    • A61F2002/30589—Sealing means
    • 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
    • A61F2002/30593—Special structural features of bone or joint prostheses not otherwise provided for hollow
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
    • A61F2002/30616—Sets comprising a plurality of prosthetic parts of different sizes or orientations
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • 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
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A61F2002/3453—Acetabular cups having a non-hemispherical convex outer surface, e.g. quadric-shaped
    • A61F2002/3462—Acetabular cups having a non-hemispherical convex outer surface, e.g. quadric-shaped having a frustoconical external shape, e.g. entirely frustoconical
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0036—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in thickness
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • 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
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    • 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
    • A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
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    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
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    • A61F2310/00161—Carbon; Graphite
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    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures

Definitions

  • the invention relates to an artificial acetabular cup, according to the preamble of claim 1.
  • Such spherical acetabular cups are particularly suitable for cementless implantation in the acetabulum.
  • Such an acetabular cup is known as a "monoblock" from the prior art (EP-A 444 382).
  • the disadvantages of this arrangement are that the outer shell has a constant wall thickness and a sandwich construction. This limits the elasticity.
  • the suspension between the outer and inner shell must be regulated by an additional suspension system and is therefore not self-supporting.
  • the invention seeks to remedy this.
  • the invention has for its object to provide an artificial acetabular cup that is increasingly elastic towards the pole and still has a simple and inexpensive construction.
  • the arrangement mentioned at the outset is further developed by the features of the characterizing part of independent claim 1.
  • the wall thickness of the outer shell is less at its pole than at its 20th - 40th degree of latitude (preferably its 25th - 35th degree of latitude), the approximate location of the beginning of the elasticity range according to the invention, and is expediently less than 0 at the pole , 30 mm, preferably less than 0.25 mm. At the 30th degree of latitude, the wall thickness is expediently about 0.5 mm.
  • the wall thickness of the outer shell at its pole should be 30-60% of the wall thickness of the outer shell at its 30th degree of latitude.
  • the edge of the outer shell has a shape and outer surface intended for anchoring in the bone, the conical edge shape enables primary jamming - called "pressfit" in technical terms - to prevent tilting movements.
  • the rotation lock is achieved by axially running edge grooves.
  • the outer surface of the edge has a three- dimensional structuring. This structuring has a depth of 0.3 to 0.8 mm, preferably 0.4 - 0.6 mm, in order to facilitate the growth or ingrowth of the bone.
  • the outer shell can be made of pure titanium or a titanium alloy, while the inner shell advantageously consists of one of the following materials: cobalt-chromium-molybdenum alloy, ceramic, polyethylene or carbon-fiber-reinforced carbon.
  • a whole set can be manufactured with several acetabular cups of different sizes, whereby identical inner shells are used for all acetabular cups and the different sizes are realized by differently sized outer shells.
  • FIG. 1 shows an enlarged cross section through the axis of rotation of the acetabular cup according to the invention
  • FIG. 2 shows a view in natural size from below in the direction of arrow A into the interior of the acetabular cup according to the invention according to FIG. 1;
  • FIG. 3 shows a greatly enlarged detail cross section in the area of the outer edge of the acetabular cup according to FIG. 1.
  • the artificial acetabular cup shown in FIGS. 1 and 2 consists on the one hand of a spherical outer shell 1 with reinforced edge 5 and internal thread 12 and on the other hand of a spherical inner shell 2 with edge 6 and external thread 13, which has a hemispherical interior 17 for receiving the not shown in the drawing Head of the femoral part of a hip prosthesis.
  • the two shells 1, 2 are screwed together by means of their threads 12, 13.
  • the edge 6 of the inner shell 2 furthermore has a conical outer surface 8 and the edge 5 of the outer shell 1 has a conical inner surface 9, which on the occasion of the factory screwing of the two shells 1, 2 frictionally come to rest against one another, as shown in FIG. 1.
  • the threads 12, 13 can be made insoluble in manufacture by crimping, so that overall the outer and inner shells 1, 2 are firmly connected at their edges 5, 6 and form a gas and liquid-tight cavity 3 between them.
  • the wall thickness of the outer shell 1 is only 0.2 mm at its pole 4 and grows continuously to 0.5 mm up to its approximate 30th degree of latitude.
  • the inner shell 2 is - as shown in FIGS. 1 and 2 - provided at its edge 6 with three blind holes 15 which run essentially parallel to the axis of rotation 14 of the acetabular cup.
  • the blind holes 15 serve to handle the acetabular cup by means of a suitable instrument (not shown in the drawing) which engages therein.
  • the conical outer surface 10 is covered with axial edge grooves 16.
  • the externally conical, reinforced edge 5 of the outer shell 1 has an outer surface 10 intended for abutment against the bones, which has a three-dimensional structure 11 with a depth of 0.5 mm.

Abstract

Die künstliche Hüftgelenkpfanne weist eine kalottenförmige Aussenschale (1) und eine kalottenförmige Innenschale (2) auf, welche einen Hohlraum (3) zwischen sich bilden, wobei die Aussen- und Innenschale (1, 2) an ihren Rändern (5, 6) miteinander unlösbar verbunden sind und die Aussenschale (1) unterhalb des Übergangskreises (7) in einen verstärkten Rand (5) übergeht. Die Wandstärke der Aussenschale (1) nimmt ausgehend von ihrem Pol (4) in Richtung des Übergangskreises (7) im wesentlichen kontinuierlich zu. Diese einfache und kostengünstige Konstruktion bewirkt ein optimales elastisches Verhalten der Hüftgelenkpfanne.

Description

Künstliche Hüftσelβnkpfanne
Die Erfindung betrifft eine künstliche Hüftgelenkpfanne, gemäss dem Oberbegriff des Patentanspruchs 1.
Solche sphärische Hüftgelenkpfannen eignen sich insbesondere für die zementfreie Implantation in das Acetabulum.
Aus dem Stand der Technik (EP-A 444 382) ist eine derartige Hüftgelenkpfanne als "Monoblock" bekannt. Die Nachteile dieser Anordnung bestehen darin, dass die Aussenschale eine konstante Wandstärke und eine Sandwich-Bauweise aufweist. Dadurch wird die Elastizität eingeschränkt. Die Aufhängung zwischen Aussen- und Innenschale, muss durch ein zusätzlich angebrachtes Federungssystem geregelt werden und ist daher nicht selbsttragend.
Hier will die Erfindung Abhilfe schaffen. Der Erfindung liegt die Aufgabe zugrunde, eine künstliche Hüftgelenkpfanne zu schaffen, welche in Richtung zum Pol hin zunehmend elastisch ausgebildet ist und trotzdem eine einfache und kostengünstige Konstruktion aufweist. Zur Lösung dieses Problemes ist die eingangs genannte Anordnung durch die Merkmale des kennzeichnenden Teils des unabhängigen Anspruchs l weitergebildet.
Damit ist der Vorteil erzielbar, dass in Richtung der resultierenden Belastungsachse genügend mechanische Stabilität, jedoch im Bereich des Poles der künstlichen Hüftgelenkpfanne, d.h. dort wo das Implantat im ausgefrästen Acetabulum seinen tiefsten Punkt erreicht, eine optimale Elastizität und Adaptabilität vorhanden ist.
Die Wandstärke der Aussenschale ist an ihrem Pol geringer als an ihrem 20. - 40. Breitengrad (vorzugsweise ihrem 25. - 35. Breitengrad) , dem ungefähren Ort des Beginns des erfindungs¬ gemässen Elastizitätsbereiches, und beträgt am Pol zweck¬ mässigerweise weniger als 0,30 mm, vorzugsweise weniger als 0,25 mm. Am 30. Breitengrad beträgt die Wandstärke zweckmässigerweise etwa 0,5 mm. Die Wandstärke der Aussenschale sollte an ihrem Pol 30 - 60 % der Wandstärke der Aussenschale an ihrem 30. Breitengrad betragen.
Der Rand der Aussenschale besitzt eine zur Verankerung im Knochen bestimmte Form und Aussenfläche, die kegelförmige Randform ermöglicht ein primäres Verklemmen - in der Fachsprache "pressfit" genannt - zur Verhinderung von Kippbewegungen. Die Rotationssicherung wird durch axial verlaufende Randnuten erreicht. Die Mantelfläche des Randes weist eine drei- dimensionale Strukturierung auf. Diese Strukturierung hat eine Tiefe von 0,3 bis 0,8 mm, vorzugsweise von 0,4 - 0,6 mm um das An-, bzw. Einwachsen des Knochens zu erleichtern. Die Aussenschale kann aus Reintitan oder einer Titanlegierung gefertigt werden, während die Innenschale vorteilhafterweise aus einem der folgenden Materialien besteht: Kobalt-Chrom- Molybdän-Legierung, Keramik, Polyethylen oder kohlenfaser¬ verstärkter Kohlenstoffen.
Fabrikatorisch kann ein ganzes Set mit mehreren Hüftgelenkpfannen verschiedener Grosse hergestellt werden, wobei für sämtliche Hüftgelenkpfannen identische Innenschalen verwendet werden und die verschiedenen Grossen durch verschieden grosse Aussenschalen realisiert werden.
Die durch die Erfindung erreichten Vorteile sind im wesentlichen darin zu sehen, dass dank der erfindungsgemässen Hüftgelenkpfanne:
1. Eine den physiologischen Elastizität-Begebenheiten des Acetabulums adaptierte Lösung in Verankerung und Funktionalität gegeben ist;
2. ein fertigungstechnisch einfacher Baukasten mit einem Minimum an zusätzlichem Instrumentar besteht; und dadurch
3. eine denkbar einfache und problemminimierende Operationstechnik angewandt werden kann. Die Erfindung und Weiterbildungen der Erfindung werden im folgenden anhand der teilweise schematischen Darstellungen mehrerer Ausführungsbeispiele noch näher erläutert. Es zeigen:
Fig. l einen vergrösserten Querschnitt durch die Drehachse der erfindungsgemässen Hüftgelenkpfanne;
Fig. 2 eine Ansicht in natürlicher Grosse von unten in Pfeilrichtung A in das Innere der erfindungsgemässen Hüftgelenkpfanne nach Fig. l; und
Fig. 3 einen stark vergösserten Detailquerschnitt im Bereich des Aussenrandes der Hüftgelenkpfanne nach Fig. 1.
Die in den Fig. 1 und 2 dargestellte künstliche Hüftgelenkpfanne besteht einerseits aus einer kalottenförmigen Aussenschale 1 mit verstärktem Rand 5 und Innengewinde 12 und anderseits aus einer kalottenförmigen Innenschale 2 mit Rand 6 und Aussengewinde 13, welche einen halbkugelförmigen Innenraum 17 zur Aufnahme des zeichnerisch nicht dargestellten Kopfes des Femurteils einer Hüftprothese bildet. Bei der Herstellung der künstliche Hüftgelenkpfanne werden die beiden Schalen 1,2 mittels ihrer Gewinde 12,13 miteinander verschraubt. Der Rand 6 der Innenschale 2 weist im weiteren eine kegelförmige Aussenfläche 8 und der Rand 5 der Aussenschale 1 eine kegelförmige Innenfläche 9 auf, welche anlässlich der fabrikatorischen Verschraubung der beiden Schalen 1,2 reibschlüssig gegeneinander zur Anlage kommen, wie dies in Fig. 1 dargestellt ist. Die Gewinde 12,13 können fabrikatorisch durch Verkrimpung unlöslich gemacht werden, so dass insgesamt die Aussen- und Innenschalen 1,2 an ihren Rändern 5,6 fest miteinander verbunden sind und zwischen sich einen gas- und flüssigkeitsdichten Hohlraum 3 bilden.
Die Wandstärke der Aussenschale 1 beträgt an ihrem Pol 4 lediglich 0,2 mm und wächst bis zu ihrem ungefähren 30. Breitengrad kontinuierlich auf 0,5 mm an.
Die Innenschale 2 ist - wie in den Fig. 1 und 2 gezeigt - an ihrem Rand 6 mit drei Sacklöchern 15 versehen, welche im wesentlichen parallel zur Drehachse 14 der Hüftgelenkpfanne verlaufen. Die Sacklöcher 15 dienen dazu, die Hüftgelenkpfanne mittels eineε geeigneten - zeichnerisch nicht dargestellten - darin eingreifenden Instrumentes zu Handhaben. Die konische Aussenfläche 10 ist mit axialen Randnuten 16 umfasst.
Wie in Fig. 3 gezeigt, besitzt der aussen konisch ausgebildete, verstärkte Rand 5 der Aussenschale l eine zur Anlage an den Knochen bestimmte Aussenfläche 10, welche eine dreidimensionale Strukturierung 11 mit einer Tiefe von 0,5 mm aufweist.

Claims

Patentansprüche
1. Künstliche Hüftgelenkpfanne mit einer kalottenförmigen Aussenschale (1) und einer kalottenförmigen Innenschale (2) , welche einen Hohlraum (3) zwischen sich bilden, wobei die Aussen- und Innenschalen (1,2) an ihren Rändern (5,6) miteinander unlösbar verbunden sind und die Aussenschale (1) unterhalb des Übergangskreises (7) in einen verstärkten Rand
(5) übergeht, dadurch gekennzeichnet, dass die Wandstärke der Aussenschale (l) ausgehend von ihrem Pol (4) in Richtung des Übergangskreises (7) im wesentlichen kontinuierlich zunimmt.
2. Hüftgelenkpfanne nach Anspruch 1, dadurch gekennzeichnet, dass der Übergangskreis (7) zwischen dem 20. - 40. Breitengrad, vorzugsweise dem 25. - 35. Breitengrad der Aussenschale (1) liegt.
3. Hüftgelenkpfanne nach Anspruch l oder 2, dadurch gekennzeichnet, dass die Wandstärke der Aussenschale (1) an ihrem Pol (4) geringer als 0,30 mm, vorzugsweise geringer als 0,25 mm iεt.
4. Hüftgelenkpfanne nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, dass die Wandstärke der Aussenschale (1) an ihrem Pol (4) 30 - 60 % der Wandstärke der Aussenschale (l) auf der Höhe deε Übergangskreiseε (7) beträgt.
5. Hüftgelenkpfanne nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Rand (5) der Aussenεchale (l) ein Innengewinde (12) und der Rand (6) der Innenεchale (2) ein darauf abgestimmtes Aussengewinde (13) zur Verschraubung der beiden Schalen (1,2) aufweisen.
6. Hüftgelenkpfanne nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Rand (6) der Innenschale (2) eine kegelförmige Aussenfläche (8) aufweist und der Rand (5) der Aussenschale (1) eine kegelförmige Innenfläche (9) aufweist, welche mit der Aussenfläche (8) reibschlüssig verbunden ist.
7. Hüftgelenkpfanne nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daεε der Rand (5) der Auεsenschale (1) eine zur Anlage an den Knochen bestimmte, konische Aussenfläche (10) mit axialen Randnuten (16) umfasst, welche eine dreidimensionale Strukturierung (11) aufweist.
8. Hüftgelenkpfanne nach Anspruch 7, dadurch gekennzeichnet, dass die Strukturierung (11) eine Tiefe von 0,3 bis 0,8 mm, vorzugsweise von 0,4 - 0,6 mm aufweist.
9. Hüftgelenkpfanne nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Aussenschale (1) aus Reintitan oder einer Titanlegierung besteht.
10. Hüftgelenkpfanne nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Innenschale (2) aus einem der folgenden Materialien besteht: Kobalt-Chrom-Molybdän-Legierung, Keramik Polyethylen oder kohlenfaserverstärkter Kohlenstoffe.
11. Hüftgelenkpfanne nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Innenschale (2) an ihrem Rand (6) mit mindestens 3 Sacklöcher (15) versehen ist, welche im wesentlichen parallel zur Drehachse (14) der Hüftgelenkpfanne verlaufen.
12. Set mit mehreren Hüftgelenkpfannen verschiedener Grosse nach einem der Ansprüche 1 - 11, dadurch gekennzeichnet, dass die einzelnen Hüftgelenkpfannen identische Innenschalen (2) und verschieden grosεe Aussenschalen (1) aufweisen.
PCT/CH1996/000395 1995-11-08 1996-11-08 Künstliche hüftgelenkpfanne WO1997017040A1 (de)

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DE59607461T DE59607461D1 (de) 1995-11-08 1996-11-08 Künstliche hüftgelenkpfanne
AT96934307T ATE203884T1 (de) 1995-11-08 1996-11-08 Künstliche hüftgelenkpfanne
US09/068,408 US6136033A (en) 1995-11-08 1996-11-08 Artificial cotyloid cavity
AU72761/96A AU7276196A (en) 1995-11-08 1996-11-08 Artificial cotyloid cavity
EP96934307A EP0859578B1 (de) 1995-11-08 1996-11-08 Künstliche hüftgelenkpfanne

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CH316195 1995-11-08
CH3161/95 1995-11-08

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EP (1) EP0859578B1 (de)
AT (1) ATE203884T1 (de)
AU (1) AU7276196A (de)
DE (1) DE59607461D1 (de)
ES (1) ES2160256T3 (de)
PT (1) PT859578E (de)
WO (1) WO1997017040A1 (de)

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FR2795302A1 (fr) * 1999-06-23 2000-12-29 Rech S Et De Fabrication S E R Prothese totale de la hanche
FR2803192A1 (fr) * 1999-12-31 2001-07-06 Jacques Fourastier Anneau impactable
US9445903B2 (en) 2008-11-24 2016-09-20 Biomet Manufacturing, Llc Multi-bearing acetabular prosthesis
US9445904B2 (en) 2009-07-14 2016-09-20 Biomet Manufacturing, Llc Multiple bearing acetabular prosthesis

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US6136033A (en) 2000-10-24
ES2160256T3 (es) 2001-11-01
EP0859578A1 (de) 1998-08-26
PT859578E (pt) 2002-01-30
EP0859578B1 (de) 2001-08-08
DE59607461D1 (de) 2001-09-13
ATE203884T1 (de) 2001-08-15
AU7276196A (en) 1997-05-29

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