DE2933237A1 - Ball joint prosthesis component - has shank with degrees of rigidity differing over length and cross=section - Google Patents

Ball joint prosthesis component - has shank with degrees of rigidity differing over length and cross=section

Info

Publication number
DE2933237A1
DE2933237A1 DE19792933237 DE2933237A DE2933237A1 DE 2933237 A1 DE2933237 A1 DE 2933237A1 DE 19792933237 DE19792933237 DE 19792933237 DE 2933237 A DE2933237 A DE 2933237A DE 2933237 A1 DE2933237 A1 DE 2933237A1
Authority
DE
Germany
Prior art keywords
shaft
joint prosthesis
part according
prosthesis part
cross
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.)
Withdrawn
Application number
DE19792933237
Other languages
German (de)
Inventor
Herbert Dr. 8000 München Heißler
Frank 8061 Röhrmoos Hoogeveen
Friedrich Dr.phil. 8033 Krailling Laußermair
Lothar Dipl.-Ing. Dr.med. 8000 München Löscher
Wolfgang Dipl.-Chem. Dr.Rer.Nat. 8150 Holzkirchen Scheer
Horst Dipl.-Ing. Dr. 8080 Fürstenfeldbruck Wurtinger
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.)
MAN AG
Original Assignee
MAN Maschinenfabrik Augsburg Nuernberg 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 MAN Maschinenfabrik Augsburg Nuernberg AG filed Critical MAN Maschinenfabrik Augsburg Nuernberg AG
Priority to DE19792933237 priority Critical patent/DE2933237A1/en
Publication of DE2933237A1 publication Critical patent/DE2933237A1/en
Withdrawn legal-status Critical Current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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • 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
    • A61F2/32—Joints for the hip
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30014—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • 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
    • 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
    • A61F2002/30784—Plurality of holes
    • A61F2002/30785—Plurality of holes parallel
    • 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
    • A61F2002/3241—Joints for the hip having a ring, e.g. for locking the femoral head into the acetabular cup
    • 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
    • A61F2002/3412—Acetabular cups with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface
    • A61F2002/3414—Polar protrusion, e.g. for centering two concentric shells
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • A61F2002/3631—Necks with an integral complete or partial peripheral collar or bearing shoulder at its base
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/365—Connections of heads to necks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2002/3678—Geometrical features
    • A61F2002/368—Geometrical features with lateral apertures, bores, holes or openings, e.g. for reducing the mass, for receiving fixation screws or for communicating with the inside of a hollow shaft
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2002/3678—Geometrical features
    • A61F2002/3686—Geometrical features bent
    • 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
    • A61F2250/0018—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in elasticity, stiffness or compressibility

Abstract

The artificial joint component has a pivot ball with a shank inserted in a bone cavity, the shank (6) having degrees of rigidity differing over its length and/or its cross-section. At the ball (8) end, the shank can be of relatively large cross-section, tapering gradually towards the free end, which has a rounded tip (15), and is of lower rigidity or a lower modulus of elasticity. The two sections can merge smoothly together, and the shank can have a sheath whose modulus of elasticity corresponds to that of the surrounding bone. The shank may be of a fibre-resin compound with a rigid core.

Description

Gelenkprothesenteil Prosthetic joint part

Die Erfindung bezieht sich auf ein Teil einer Gelenkprothese und zwar auf das Teil, das die Gelenkkugel trägt. Dabei soll es sich insbesondere um das eine, die Gelenkkugel tragende Teil einer Hüftgelenktotalendoprothese handeln.The invention relates to a part of a joint prosthesis on the part that carries the joint ball. In particular, this should concern the act a, the ball bearing part of a total hip joint endoprosthesis.

Ein solches Gelenk ist zum besseren Verständnis in allgemeiner Form in Fig 1 der Zeichnung dargestellt.Such a joint is in general form for better understanding shown in Figure 1 of the drawing.

Eine Pfannenfassung 1 umschließt die Kugelpfanne 2. Mit einem Ring 3 ist die Pfanne 2 in der Fassung 1 gehalten. Die Teile 1 - 3 bilden das eine Gelenkteil der Gelenkprothese. Das andere Teil dieser Prothese weist eine Kugel 4 auf, die mit der Pfanne 2 zusammenwirkt. Diese Kugel sitzt beispielsweise auf einem Zapfen 5, der mit dem Schaft 6 fest verbunden ist. Zwischen Zapfen 5 und Schaft 6 befindet sich eine sowohl mit dem Zapfen als auch dem Schaft einstückige Scheibe 7, auf der sich die Kugel 4 mit dem unteren Ende eines Kugelhalses 8 abstützt. Mit dem Schaft 6 stützt sich die Gelenkkugel 4 in einer zur Aufnahme des Schaftes vorbereiteten Höhlung 9 des Knochens 10 ab. Mit 11 ist der Trochanter bezeichnet, an dem die zum Gelenk gehörenden Muskeln des Bewegungsapparates angewachsen sind.A socket holder 1 encloses the ball socket 2. With a ring 3, the pan 2 is held in the socket 1. Parts 1 - 3 form one joint part the joint prosthesis. The other part of this prosthesis has a ball 4 which cooperates with the pan 2. This ball sits on a peg, for example 5, which is firmly connected to the shaft 6. Located between pin 5 and shaft 6 a disc 7, which is integral with both the pin and the shaft, on which the ball 4 is supported with the lower end of a ball neck 8. With the shaft 6, the joint ball 4 is supported in one to hold the shaft prepared cavity 9 of the bone 10. The trochanter is denoted by 11, on which the muscles of the musculoskeletal system belonging to the joint have grown.

Aufgabe der vorliegenden Erfindung ist es nun, den die Gelenkkugel 4 tragenden Gelenkteil so auszubilden, daß der Gelenkteil über eine sehr lange Zeit sicher mit dem zugehörigen Knochen verbunden bleibt, wozu es nötig ist, daß bei möglichst geringem Einsatz gewicht alle auftretenden Kräfte aufgenommen werden können, ohne daß dies zu einer Lockerung des Gelenkteiles gegenüber dem Knochen führt.The object of the present invention is now that the joint ball 4 supporting joint part so that the joint part over a very long time remains securely connected to the associated bone, for which it is necessary that with all forces that occur can be absorbed with the lowest possible weight, without this leading to a loosening of the joint part with respect to the bone.

Der Lösung dieser Aufgabe dienen die Merkmale der Patentansprüche.The features of the claims serve to solve this problem.

Die Lösung ergibt gegenüber dem Stand der Technik eine Lösung, die über lange Zeit bei sparsamem Materialeinsatz betriebssicher ist.Compared to the prior art, the solution results in a solution that is operationally reliable for a long time with economical use of materials.

Je ein Ausführungsbeispiel der Erfindung ist in Fig. 2 - 5 der Zeichnung schematisch dargestellt und nachfolgend erläutern; Fig. 6 gibt die verschiedenen, für die Auslegung wesentlichen Belastungszonen wider.One embodiment of the invention is shown in FIGS. 2-5 of the drawing shown schematically and explained below; Fig. 6 gives the various load zones that are essential for the design.

Bei der Lösung nach Fig. 2 besteht der Schaft 6 in seiner Gesamtheit aus einem Faserverbundwerkstoff, der ein Faser-Harz- System ist. Der Schaft besteht dabei aus einem hochbiegesteifen Kern 12, der von einem relativ elastischen Mantel 13 umgeben ist. Der Mantel 13 seinerseits ist von einer Außenhülle 14 umgeben. Der Faseranteil gegenüber dem Harzanteil ist beim Kern 12 relativ hoch, während bei der Außenhülle 13 der Harzanteil gegenüber dem im Kreuzverbund angeordneten Faseranteil relativ hoch ist. Der Kern erstreckt sich vom oberen, der Kugel zugeordneten Ende des Schaftes über etwa 2/3 der Schaftlänge, so daß am unteren Ende der Schaft in einen kernlosen Fuß ausläuft. Der Querschnitt des Schaftes ist am oberen Ende relativ groß und verringert sich stetig zum unteren Ende hin, wo der Schaft in einer abgerundeten Spitze 15 ausläuft. Die Anordnung einer oder mehrerer Faserarten ist so gewählt, daß die Festigkeitswerte der verschiedenen Schaftzonen den im Hinblick auf die Belastung und Eigenschaften des umgebenden Knochengewebes zu fordernden Eigenschaften weitestgehend entsprechen.In the solution according to FIG. 2, the shaft 6 consists in its entirety made of a fiber composite material, which is a fiber-resin System is. The shaft consists of a highly rigid core 12, which is of a relatively elastic jacket 13 is surrounded. The jacket 13 in turn is of an outer shell 14 surrounded. The fiber content compared to the resin content is relatively high in the core 12, while in the case of the outer shell 13 the proportion of resin compared to that arranged in the cross connection Fiber content is relatively high. The core extends from the upper one associated with the sphere End of the shaft about 2/3 of the shaft length, so that the shaft is at the lower end leaks into a seedless foot. The cross section of the shaft is at the top relatively large and steadily decreases towards the lower end, where the shaft is in a rounded tip 15 runs out. The arrangement of one or more types of fibers is chosen in such a way that the strength values of the various shaft zones correspond to the on the load and properties of the surrounding bone tissue to be challenged Properties largely correspond.

Bei der Lösung nach Fig. 3 ist ein hohler IjIetallmantel 16 vorgesehen, dessen Querschnitt und Wandstärke vom oberen zum unteren Schaftende zur Lösung der gestellten Aufgabe stetig abnehmen. Der Hohlraum 17 kann mit einem der Ausführungsform gemäß Fig. 2 entsprechenden Kern ausgestattet sein. Bei dieser Lösung liegt das Bauteil mit dem höheren E-Modul, also der höheren Festigkeit, außen, so daß diese Lösung eine besonders hohe Festigkeit bei relativ geringem Materialeinsatz ergibt.In the solution according to FIG. 3, a hollow metal jacket 16 is provided, its cross-section and wall thickness from the upper to the lower shaft end to solve the steadily decrease. The cavity 17 can with one of the embodiment be equipped according to FIG. 2 corresponding core. That is with this solution Component with the higher modulus of elasticity, i.e. the higher strength, on the outside, so that this Solution results in a particularly high strength with relatively little use of material.

Auch bei dieser Lösung sind die Werkstoffe des Werkstoffverbundes--so angeordnet, daß die Festigkeitswerte der verschiedenen Schaftzonen den im Hinblick auf Festigkeit und Beschaffenheit des umgebenden Knochengewebes optimalen Bedingungen entsprechen.In this solution, too, the materials of the composite material are - like this arranged that the strength values of the various shaft zones with regard to optimal conditions for the strength and quality of the surrounding bone tissue correspond.

Die Lösung nach Fig. 4 unterscheidet sich von der Lösung nach Fig. 3 im wesentlichen durch eine Materialumkehr: der Kern 18 besteht aus Metall mit relativ hohem E-Modul und entsprechend hoher Steifigkeit, und dieser Kern 18 ist von einem Mantel 19 aus Verbundwerkstoff in der Form eines Faser-Harz-Systems umgeben. Bei dieser Lösung kann eine gegenüber der Lösung nach Fig. 3 verbesserte Verträglichkeit mit dem Knochengewebe erwartet werden Bei der Lösung nach Fig. 5 besteht der Schaft ausschließlich aus Metall. Er hat einen von oben nach unten kontinuierlich abnehmenden Querschnitt und eine ebensolche Wandstärke. Die den Hohlraum umschließende Wand ist mit Löchern 20 versehen, so daß der Schaft besonders gut vom Knochengewebe um- und durchwachsen werden kann.The solution according to FIG. 4 differs from the solution according to FIG. 3 essentially by a material reversal: the core 18 is made of metal with relatively high modulus of elasticity and correspondingly high rigidity, and this core 18 is surrounded by a jacket 19 made of composite material in the form of a fiber-resin system. With this solution, an improved compatibility compared to the solution according to FIG. 3 can be achieved to be expected with the bone tissue. In the solution according to FIG. 5, the shaft consists made entirely of metal. It has a continuously decreasing from top to bottom Cross-section and a wall thickness of the same type. The wall surrounding the cavity is provided with holes 20 so that the shaft is particularly well surrounded by bone tissue. and can be grown through.

In Fig. 6 ist der Schaft mit seinen verschiedenen Hauptbelastungszonen dargestellt. Im oberen Teil 21 muß der Schaftteil durch Kontur und Materialbeschaffenheit eine besonders hohe Festigkeit haben. Im unteren Teil 22 soll der Schaft nur geringe Steifigkeit, bzw. nur einen niedrigen E-Modul haben.In Fig. 6 is the shaft with its various main stress zones shown. In the upper part 21, the shaft part must by contour and material properties have a particularly high strength. In the lower part 22, the shaft should only be small Stiffness or only have a low modulus of elasticity.

Claims (10)

Patentansprüche föi. Gelenkprothesenteil mit einer Gelenkkugel, die mittels eines Schaftes in eine Knochenhöhlung einzusetzen ist, dadurch gekennzeichnet, daß der dornförmige Schaft (6) über seine Länge und/oder über seinen Querschnitt unterschiedliche Festigkeitseigenschaften aufweist. Claims föi. Joint prosthesis part with a joint ball that is to be inserted into a bone cavity by means of a shaft, characterized in that that the mandrel-shaped shaft (6) over its length and / or over its cross section has different strength properties. 2. Gelenkprothesenteil nach Anspruch 1, dadurch gekennzeichnet, daß der Schaft (6) an dem der Kugel (8) zugehörigen Ende bei relativ großem, nur langsam abnehmendem Anfangsquerschnitt eine hohe Biegesteifigkeit, gegen das freie, in einer abgerundeten Spitze (15) auslaufende Ende eine geringere Steifigkeit bzw. einen niederen E-Modul hat.2. Joint prosthesis part according to claim 1, characterized in that the shaft (6) at the end belonging to the ball (8) with a relatively large, only slowly decreasing initial cross-section a high bending stiffness, compared to the free, in one rounded tip (15) tapering end a lower rigidity or a has a low modulus of elasticity. 3. Gelenkprothesenteil nach Anspruch 2, dadurch gekennzeichnet, daß der Übergang vom einen zum anderen Bereich stetig erfolgt.3. Joint prosthesis part according to claim 2, characterized in that the transition from one area to the other is continuous. 4. Gelenkprothesenteil nach Anspruch 2 oder Anspruch 3, dadurch gekennzeichnet, daß der Schaft (6) vorzugsweise gegen das freie Ende, gegebenenfalls vom Übergangsbereich bis zum freien Ende, einen Überzug aufweist, dessen E-Modul dem E-Modul des umgebenden Knochens entspricht.4. Joint prosthesis part according to claim 2 or claim 3, characterized in that that the shaft (6) preferably against the free end, optionally from the transition area to the free end, has a coating, the modulus of elasticity of which corresponds to the modulus of elasticity of the surrounding Corresponds to bone. 5. Gelenkprothesenteil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Schaft (6) aus einem Faser-Harz-Verbundwerkstoff besteht und dabei einen biegesteifen Kern (12) mit im Verhältnis zum Harz hohen Faseranteil, einen relativ elastischen Mantel (13) und eine Außenhülle (14) mit im Verhältnis zum Faseranteil hohen Harzanteil aufweist.5. Joint prosthesis part according to one of claims 1 to 4, characterized in that that the shaft (6) consists of a fiber-resin composite material and thereby a Rigid core (12) with a high fiber content in relation to the resin, a relatively elastic jacket (13) and an outer shell (14) with in relation to the fiber content has a high resin content. 6. Gelenkprothesenteil nach Anspruch 5, dadurch gekennzeichnet, daß die Fasern der Außenhülle (14) in Kreuzlagen angeordnet sind.6. Joint prosthesis part according to claim 5, characterized in that the fibers of the outer sheath (14) are arranged in cross layers. 7. Gelenkprothesenteil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Schaft (6) einen biegesteifen Kern (17) aus einem Harz-Verbundwerkstoff aufweist, der von einem Metallmantel (16) umgeben ist.7. Joint prosthesis part according to one of claims 1 to 4, characterized in that that the shaft (6) has a rigid core (17) made of a resin composite material has, which is surrounded by a metal jacket (16). 8. Gelenkprothesenteil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Schaft (6) einen Metallkern (18) mit hohem E-Modul aufweist, der von einem Mantel (19) aus Faser-Harz-Verbundwerkstoff umgeben ist.8. Joint prosthesis part according to one of claims 1 to 4, characterized in that that the shaft (6) has a metal core (18) with a high modulus of elasticity, which is of a a coat (19) is surrounded by fiber-resin composite material. 9. Gelenkprothesenteil nach einem der Ansprüche 5, 7 und 8, dadurch gekennzeichnet, daß sich der Kern (12, 17, 18) nur über etwa zwei Drittel der Gesamtlänge des Schaftes t6) - vom Kugelende ausgehend - erstreckt.9. Joint prosthesis part according to one of claims 5, 7 and 8, characterized characterized in that the core (12, 17, 18) is only about two thirds of the total length of the shaft t6) - starting from the ball end - extends. 10. Gelenkprothesenteil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Schaft (6) ein hohles Metallbauteil mit vom Ende der Kugel zum freien Ende (15) hin abnehmendem Querschnitt ist, dessen Wände von Öffnungen (20) durchbrochen sind.10. Joint prosthesis part according to one of claims 1 to 4, characterized characterized in that the shaft (6) is a hollow metal component with the end of the ball towards the free end (15) decreasing cross-section, the walls of which are openings (20) are broken.
DE19792933237 1979-08-16 1979-08-16 Ball joint prosthesis component - has shank with degrees of rigidity differing over length and cross=section Withdrawn DE2933237A1 (en)

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050533A1 (en) * 1980-10-17 1982-04-28 Francis Henri Bréard Femoral head endoprothesis with self locking stem
EP0065481A2 (en) * 1981-05-18 1982-11-24 Mecron Medizinische Produkte Gmbh Hip joint prosthesis with perforated hollow stem
FR2525105A1 (en) * 1982-04-19 1983-10-21 Vitek Inc ARTICULATION PROSTHESES AND THEIR IMPLANTATION
US4595393A (en) * 1983-11-23 1986-06-17 Mecron Medizinische Produkte Gmbh Hip joint prosthesis having a hollow shaft
EP0190446A1 (en) * 1985-02-07 1986-08-13 GebràœDer Sulzer Aktiengesellschaft Metallic bone implant
US4619659A (en) * 1983-09-21 1986-10-28 Ulrich Witzel Hip endoprosthesis
FR2627380A1 (en) * 1988-02-24 1989-08-25 Cuilleron J Two-part joint prosthesis - has biocompatible flexible tubular shank which wedges in bone medullary channel
US4904262A (en) * 1987-05-06 1990-02-27 Fried. Krupp Gmbh Joint prosthesis and process for its manufacture
EP0358601A1 (en) * 1988-08-30 1990-03-14 GebràœDer Sulzer Aktiengesellschaft Anchoring shaft for an endoprosthesis
US4919665A (en) * 1982-04-19 1990-04-24 Homsy Charles A Implantation of articulating joint prosthesis
EP0375599A2 (en) * 1988-12-23 1990-06-27 Johnson & Johnson Professional Products GmbH Endoprosthesis
US5092899A (en) * 1988-03-21 1992-03-03 Mark Forte Prosthesis with flexible intramedullary stem
EP0494476A1 (en) * 1990-12-12 1992-07-15 Johnson & Johnson Professional Products GmbH Shaft prosthesis
US5316550A (en) * 1986-04-07 1994-05-31 Mark Forte Prosthesis with flexible intramedullary stem
WO1994016649A1 (en) * 1993-01-19 1994-08-04 Mathys Ag Bettlach Chirurgische Instrumente Und Implantate Shaft for an articulation endoprosthesis
EP0765644A2 (en) * 1995-09-29 1997-04-02 JOHNSON & JOHNSON PROFESSIONAL Inc. Hollow bone prosthesis with tailored flexibility
EP1365165A1 (en) * 2002-05-22 2003-11-26 Bioprofile Conical coupling and prosthesis comprising such a coupling
WO2008015284A1 (en) * 2006-08-04 2008-02-07 Ceramtec Ag Asymmetric formation of prosthetic components for the manipulation and suppression of natural frequencies

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050533A1 (en) * 1980-10-17 1982-04-28 Francis Henri Bréard Femoral head endoprothesis with self locking stem
EP0065481A2 (en) * 1981-05-18 1982-11-24 Mecron Medizinische Produkte Gmbh Hip joint prosthesis with perforated hollow stem
EP0065481A3 (en) * 1981-05-18 1982-12-29 Mecron Medizinische Produkte Gmbh Hip joint prosthesis with perforated hollow stem
US4919665A (en) * 1982-04-19 1990-04-24 Homsy Charles A Implantation of articulating joint prosthesis
FR2525105A1 (en) * 1982-04-19 1983-10-21 Vitek Inc ARTICULATION PROSTHESES AND THEIR IMPLANTATION
US4619659A (en) * 1983-09-21 1986-10-28 Ulrich Witzel Hip endoprosthesis
US4595393A (en) * 1983-11-23 1986-06-17 Mecron Medizinische Produkte Gmbh Hip joint prosthesis having a hollow shaft
EP0190446A1 (en) * 1985-02-07 1986-08-13 GebràœDer Sulzer Aktiengesellschaft Metallic bone implant
US5316550A (en) * 1986-04-07 1994-05-31 Mark Forte Prosthesis with flexible intramedullary stem
US4904262A (en) * 1987-05-06 1990-02-27 Fried. Krupp Gmbh Joint prosthesis and process for its manufacture
FR2627380A1 (en) * 1988-02-24 1989-08-25 Cuilleron J Two-part joint prosthesis - has biocompatible flexible tubular shank which wedges in bone medullary channel
US5092899A (en) * 1988-03-21 1992-03-03 Mark Forte Prosthesis with flexible intramedullary stem
EP0358601A1 (en) * 1988-08-30 1990-03-14 GebràœDer Sulzer Aktiengesellschaft Anchoring shaft for an endoprosthesis
CH676196A5 (en) * 1988-08-30 1990-12-28 Sulzer Ag
EP0375599A2 (en) * 1988-12-23 1990-06-27 Johnson & Johnson Professional Products GmbH Endoprosthesis
DE3844157A1 (en) * 1988-12-23 1990-06-28 Mecron Med Prod Gmbh ENDOPROTHESIS
EP0375599A3 (en) * 1988-12-23 1991-05-02 Johnson & Johnson Professional Products GmbH Endoprosthesis
US5156628A (en) * 1990-12-12 1992-10-20 Johnson & Johnson Professional Products Gmbh Shaft prosthesis
EP0494476A1 (en) * 1990-12-12 1992-07-15 Johnson & Johnson Professional Products GmbH Shaft prosthesis
WO1994016649A1 (en) * 1993-01-19 1994-08-04 Mathys Ag Bettlach Chirurgische Instrumente Und Implantate Shaft for an articulation endoprosthesis
US5571202A (en) * 1993-01-19 1996-11-05 Mathys Ag Bettlach Shaft for an articulation endoprosthesis
EP0765644A2 (en) * 1995-09-29 1997-04-02 JOHNSON & JOHNSON PROFESSIONAL Inc. Hollow bone prosthesis with tailored flexibility
EP0765644A3 (en) * 1995-09-29 1998-12-02 JOHNSON & JOHNSON PROFESSIONAL Inc. Hollow bone prosthesis with tailored flexibility
EP1365165A1 (en) * 2002-05-22 2003-11-26 Bioprofile Conical coupling and prosthesis comprising such a coupling
FR2840039A1 (en) * 2002-05-22 2003-11-28 Bioprofile CONICAL COUPLING AND PROSTHESIS COMPRISING SUCH A COUPLING
US6997958B2 (en) 2002-05-22 2006-02-14 Bioprofile Conical coupling and prosthesis comprising such a coupling
WO2008015284A1 (en) * 2006-08-04 2008-02-07 Ceramtec Ag Asymmetric formation of prosthetic components for the manipulation and suppression of natural frequencies

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