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WO2006084493A2 - Condyle cap implant for an artificial hip joint - Google Patents

Condyle cap implant for an artificial hip joint Download PDF

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Publication number
WO2006084493A2
WO2006084493A2 PCT/EP2005/012238 EP2005012238W WO2006084493A2 WO 2006084493 A2 WO2006084493 A2 WO 2006084493A2 EP 2005012238 W EP2005012238 W EP 2005012238W WO 2006084493 A2 WO2006084493 A2 WO 2006084493A2
Authority
WO
WIPO (PCT)
Prior art keywords
cap
condyle
natural
joint
implant
Prior art date
Application number
PCT/EP2005/012238
Other languages
German (de)
French (fr)
Other versions
WO2006084493A3 (en
Inventor
Hans Grundei
Darren Fern
Original Assignee
Eska Implants Gmbh & Co.
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 Eska Implants Gmbh & Co. filed Critical Eska Implants Gmbh & Co.
Priority to GB0621783A priority Critical patent/GB2430375B/en
Publication of WO2006084493A2 publication Critical patent/WO2006084493A2/en
Publication of WO2006084493A3 publication Critical patent/WO2006084493A3/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
    • A61F2/30721—Accessories
    • A61F2/30734—Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
    • 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
    • A61F2/3601—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices
    • 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
    • A61F2/3601—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices
    • A61F2/3603—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices implanted without ablation of the whole natural femoral head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30721—Accessories
    • A61F2/30734—Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
    • A61F2002/30736—Augments or augmentation pieces, e.g. wedges or blocks for bridging a bone defect
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30907—Nets or sleeves applied to surface of prostheses or in cement
    • A61F2002/30909—Nets
    • 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
    • A61F2002/3092—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth having an open-celled or open-pored structure
    • 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
    • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
    • A61F2002/30948—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using computerized tomography, i.e. CT scans

Definitions

  • the present invention relates to a hip replacement cap implant for an artificial hip joint which consists of a cap modeled on the outer shape of the natural joint ball, which can be placed on a (partially) prepared natural residual joint head.
  • Such an implant can be created from the so-called set for creating a Arm istsimplantates according to DE-C-102 18 801.
  • cap implants are increasingly used, which are placed over the prepared natural residual joint head and then fixed in this position.
  • the prerequisite for a stable secondary fixation is stable bone material of the residual bone.
  • This pin has a surface which is provided with a three-dimensional open-meshed spatial network structure into and through which bone trabeculae of the surrounding bone material grow and provide stable secondary fixation.
  • Another indication is, for example, a cyst in the hip joint head, which leads to surface defects of the condyle.
  • necrosis of the condyle can lead to surface defects, but still does not warrant completely resecting the condyle and providing the patient with a short stem endoprosthesis (EP 0 878 176).
  • the problem here is that at the sites of the surface defects of the head, the interior of the cap implant does not or does not completely come into contact with the bone. This means that the occurring forces are not introduced uniformly over the entire surface of the condyle in the femur. Therefore, attempts have hitherto been made to cure the surface defects either by cement, if a cementable cap is implanted, or by bone material of the patient. The long-term stability of these measures is usually not entirely satisfactory.
  • the object of the present invention to remedy this situation, ie to propose a condyle cap implant, which has an excellent long-term stability and the interior of which is almost completely in direct contact with the remaining natural condyle.
  • This object is achieved by the condyle cap implant with the further features according to claim 1.
  • accumulations of material are provided inside the cap for filling surface defects in the natural joint ball.
  • the accumulations of material fill in the surface defects of the natural condyle, so that there is a de facto large-area interlock between the inside of the cap and the natural joint ball. A more uniform application of force into the femur is the result.
  • the cap implant can be made individually to patients after measuring the surface defects by CT or X-ray. For reasons of cost, however, a standardized implant with at least one standardized material accumulation is preferred. As a result, the surgeon must make adjustments to the natural condyle during the operation so that the desired form fit can occur. More precisely, this means that the surgeon, if necessary, must carry out material removal operations on the natural residual joint head, in which case the standardized accumulations of material inside the cap come to rest.
  • the material accumulations are formed integrally with the material of the joint cap.
  • This material will typically be biocompatible metal.
  • the accumulations of material have then been produced by precision casting directly with the cap.
  • the accumulations of material can project up to one third of the diameter of the cap at its base edge into the interior of the cap.
  • Exceeding dimensions may be critical as the surface defects to be filled are so deep that the stability of the natural joint ball as a whole could be in question.
  • the cap interior is at least partially provided with an open-meshed three-dimensional spatial network structure, into which and through which bone trabeculae of the surrounding bone material can grow and provide a stable secondary fixation.
  • the accumulations of material can also be provided, at least in part, with an open-mesh three-dimensional spatial network structure, for the same reason mentioned.
  • the single drawing figure shows a condyle cap implant 1 in cross section.
  • Clearly recognizable is the external shape, which is modeled on the shape of the natural joint ball.
  • the cap interior has three sections, starting from the base edge 3 a steeper section followed by a flatter section, which eventually merges into the horizontal cap bottom.
  • the accumulation of material 2 which serves as a defect filler for surface defects in the natural joint ball.
  • the accumulation of material 2 is formed tapered.
  • the dimension a is for example (in the enlarged case shown here) in reality 2.5 mm, the dimension b, for example, 5 mm. Up to one third of the diameter at the base edge 3 should take the material accumulations 2.
  • All sections of the cap interior are provided with an open-mesh three-dimensional space network structure 4.

Landscapes

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

Abstract

Disclosed is a condyle cap implant (1) for an artificial hip joint, comprising a cap which is modeled after the exterior shape of the natural joint ball and can be placed on a natural remaining condyle. Material aggregates (2) which are used for filling surface defects in the natural remaining condyle are provided in the interior of the cap.

Description

Gelenkkopf-Kappenimplantat für ein künstliches Hüftgelenk Conical head cap implant for an artificial hip joint

Beschreibungdescription

Die vorliegende Erfindung betrifft ein Gelenkkopf-Kappenimplantat für ein künstliches Hüftgelenk, das aus einer der äußeren Form der natürlichen Gelenkkugel nachgebildeten Kappe besteht, die auf einen (teil)präparierten natürlichen Restgelenkkopf setzbar ist.The present invention relates to a hip replacement cap implant for an artificial hip joint which consists of a cap modeled on the outer shape of the natural joint ball, which can be placed on a (partially) prepared natural residual joint head.

Ein derartiges Implantat lässt sich aus dem sogenannten Set zur Erstellung eines Armierungsimplantates gemäß der DE-C-102 18 801 erstellen.Such an implant can be created from the so-called set for creating a Armierungsimplantates according to DE-C-102 18 801.

In jüngster Zeit kommen verstärkt sogenannte Kappenimplantate zur Anwendung, welche über den präparierten natürlichen Restgelenkkopf gesetzt werden und in dieser Lage dann fixiert werden. Voraussetzung für eine stabile Sekundärfixation ist stabiles Knochenmaterial des Restknochens. So wird in der schon erwähnten Druckschrift vorgeschlagen, an die Gelenkkopfkappe einen Zapfen anzukoppeln, der in eine entsprechende Ausfräsung im Schenkelhals gesetzt wird. Dieser Zapfen weist eine Oberfläche auf, welche mit einer dreidimensionalen offenmaschigen Raumnetzstruktur versehen ist, in welche und durch welche hindurch Knochentrabekel des umliegenden Knochenmaterials wachsen und für die stabile Sekundärfixation sorgen.More recently, so-called cap implants are increasingly used, which are placed over the prepared natural residual joint head and then fixed in this position. The prerequisite for a stable secondary fixation is stable bone material of the residual bone. Thus, it is proposed in the already mentioned document to couple a pin to the condyle, which is set in a corresponding cutout in the femoral neck. This pin has a surface which is provided with a three-dimensional open-meshed spatial network structure into and through which bone trabeculae of the surrounding bone material grow and provide stable secondary fixation.

Es gibt jedoch Indikationen, bei denen man noch davon absehen kann, den Schenkelhals auszufräsen, um so Platz für den Zapfen zu schaffen. Angeführt wird hier die sogenannte Perthes-Calve-Legg-Krankheit, die ein- oder beidseitig im Bereich der Femurkopfepiphyse aseptische Knochennekrosen hervorruft. Vor allem bei Jungen vom 4. bis 12. Lebensjahr tritt diese Krankheit auf (Pschyrembel, Klinisches Wörterbuch, 259. Auflage, 2002, Seite 1285). Eine Ausheilung ohne Deformierung ist zwar möglich, jedoch bleibt eine eventuelle Walzenoder Pilzform des Schenkelkopfes mit Abplattung der Hüftgelenkpfanne, seltener Coxa Plana und Arthrosis deformans zurück.However, there are indications that one may still refrain from raking the femoral neck to make room for the pin. Cited here is the so-called Perthes-Calve-Legg disease, which causes one or both sides of the femoral epiphysis aseptic bone necrosis. Especially in boys from the 4th to 12th Year of life, this disease occurs (Pschyrembel, Clinical Dictionary, 259th edition, 2002, page 1285). A healing without deformation is possible, but remains a possible roll or mushroom shape of the femoral head with flattening of the acetabulum, more rarely Coxa Plana and Arthrosis deformans back.

Eine weitere Indikation ist beispielsweise eine Zyste im Hüftgelenkskopf, die zu Oberflächendefekten des Gelenkkopfes führt.Another indication is, for example, a cyst in the hip joint head, which leads to surface defects of the condyle.

Ganz generell kann eine Nekrose des Gelenkkopfes zu oberflächenhaften Defekten führen, die es aber immer noch nicht rechtfertigen, den Gelenkkopf vollständig zu resezieren und den Patienten mit einer Kurzstielendoprothese (EP 0 878 176) zu versorgen.Quite generally, necrosis of the condyle can lead to surface defects, but still does not warrant completely resecting the condyle and providing the patient with a short stem endoprosthesis (EP 0 878 176).

Problematisch hierbei freilich ist, dass an den Stellen der Oberflächendefekte des Kopfes das Innere des Kappenimplantates nicht oder nicht vollständig zum Anliegen an den Knochen kommt. Dies bedeutet, dass die auftretenden Kräfte nicht gleichmäßig über die gesamte Oberfläche des Gelenkkopfes in den Femur eingeleitet werden. Daher hat man bislang versucht, die Oberflächendefekte entweder durch Zement, sofern eine zementierbare Kappe implantiert wird, oder aber durch Knochenmaterial des Patienten zu heilen. Die Langzeitstabilität dieser Maßnahmen ist meist nicht ganz befriedigend.Of course, the problem here is that at the sites of the surface defects of the head, the interior of the cap implant does not or does not completely come into contact with the bone. This means that the occurring forces are not introduced uniformly over the entire surface of the condyle in the femur. Therefore, attempts have hitherto been made to cure the surface defects either by cement, if a cementable cap is implanted, or by bone material of the patient. The long-term stability of these measures is usually not entirely satisfactory.

Vor diesem Hintergrund ist es die Aufgabe der vorliegenden Erfindung, hier Abhilfe zu schaffen, d. h. also ein Gelenkkopf-Kappenimplantat vorzuschlagen, welches über eine hervorragende Langzeitstabilität verfügt und dessen Inneres praktisch vollständig mit dem verbliebenen natürlichen Gelenkkopf im unmittelbaren Kontakt steht. Gelöst wird diese Aufgabe durch das Gelenkkopf-Kappenimplantat mit den weiteren Merkmalen gemäß dem Anspruch 1.Against this background, the object of the present invention to remedy this situation, ie to propose a condyle cap implant, which has an excellent long-term stability and the interior of which is almost completely in direct contact with the remaining natural condyle. This object is achieved by the condyle cap implant with the further features according to claim 1.

Weitere vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.Further advantageous developments emerge from the subclaims.

Demgemäß sind im Inneren der Kappe Materialanhäufungen vorgesehen zur Füllung von Oberflächendefekten in der natürlichen Gelenkkugel. Die Materialanhäufungen füllen die Oberflächendefekte des natürlichen Gelenkkopfes aus, so dass es de facto zu einem großflächigen Formenschluss zwischen dem Inneren der Kappe und der natürlichen Gelenkkugel kommt. Eine gleichmäßigere Krafteinleitung in den Femur ist hiervon die Folge.Accordingly, accumulations of material are provided inside the cap for filling surface defects in the natural joint ball. The accumulations of material fill in the surface defects of the natural condyle, so that there is a de facto large-area interlock between the inside of the cap and the natural joint ball. A more uniform application of force into the femur is the result.

Das Kappenimplantat kann patientenindividuell nach Vermessung der Oberflächendefekte durch CT oder Röntgen hergestellt werden. Aus Kostengründen bevorzugt wird aber ein standardisiertes Implantat mit zumindest einer standardisierten Materialanhäufung. Dies führt dazu, dass der Operateur während der Operation Anpassungen an dem natürlichen Gelenkkopf vornehmen muss, damit der erwünschte Formenschluss eintreten kann. Genauer bedeutet dies, dass der Operateur gegebenenfalls am natürlichen Restgelenkkopf Materialabtragungen vornehmen muss, in welche dann die standardisierten Materialanhäufungen im Inneren der Kappe zum Liegen kommen.The cap implant can be made individually to patients after measuring the surface defects by CT or X-ray. For reasons of cost, however, a standardized implant with at least one standardized material accumulation is preferred. As a result, the surgeon must make adjustments to the natural condyle during the operation so that the desired form fit can occur. More precisely, this means that the surgeon, if necessary, must carry out material removal operations on the natural residual joint head, in which case the standardized accumulations of material inside the cap come to rest.

Gemäß einer vorteilhaften Ausführungsform sind die Materialanhäufungen einstückig mit dem Material der Gelenkkappe ausgebildet. Dieses Material wird typischerweise körperverträgliches Metall sein. Die Materialanhäufungen sind dann im Feingussverfahren direkt mit der Kappe erzeugt worden. Die Materialanhäufungen können bis zu einem Drittel des Durchmessers der Kappe an ihrer Basiskante in das Innere der Kappe ragen. Darüber hinausgehende Dimensionen könnten kritisch sein, da die dann zu füllenden Oberflächendefekte so tief sind, dass die Stabilität der natürlichen Gelenkkugel als Ganzes in Frage stehen könnte.According to an advantageous embodiment, the material accumulations are formed integrally with the material of the joint cap. This material will typically be biocompatible metal. The accumulations of material have then been produced by precision casting directly with the cap. The accumulations of material can project up to one third of the diameter of the cap at its base edge into the interior of the cap. Exceeding dimensions may be critical as the surface defects to be filled are so deep that the stability of the natural joint ball as a whole could be in question.

Bevorzugt ist das Kappeninnere zumindest teilweise mit einer offenmaschigen dreidimensionalen Raumnetzstruktur versehen, in welche und durch welche hindurch Knochentrabekel des umliegenden Knochenmaterials wachsen und für eine stabile Sekundärfixation sorgen können.Preferably, the cap interior is at least partially provided with an open-meshed three-dimensional spatial network structure, into which and through which bone trabeculae of the surrounding bone material can grow and provide a stable secondary fixation.

Auch die Materialanhäufungen können bevorzugt zumindest teilweise mit einer offenmaschigen dreidimensionalen Raumnetzstruktur versehen sein, und zwar aus demselben erwähnten Grunde.The accumulations of material can also be provided, at least in part, with an open-mesh three-dimensional spatial network structure, for the same reason mentioned.

Die Erfindung wird anhand der einzigen Zeichnungsfigur beispielhaft näher erläutert.The invention will be explained in more detail by way of example with reference to the single drawing figure.

Die einzige Zeichnungsfigur zeigt ein Gelenkkopf-Kappenimplantat 1 im Querschnitt. Deutlich erkennbar ist die äußere Form, die der Form der natürlichen Gelenkkugel nachgebildet ist.The single drawing figure shows a condyle cap implant 1 in cross section. Clearly recognizable is the external shape, which is modeled on the shape of the natural joint ball.

Das Kappeninnere weist drei Abschnitte auf, und zwar ausgehend von der Basiskante 3 einen steileren Abschnitt, dem sich ein flacherer Abschnitt anschließt, der schließlich in den waagerechten Kappenboden übergeht.The cap interior has three sections, starting from the base edge 3 a steeper section followed by a flatter section, which eventually merges into the horizontal cap bottom.

Links im Querschnitt angedeutet ist die Materialanhäufung 2, die als Defektfüller für Oberflächendefekte in der natürlichen Gelenkkugel dient. Die Materialanhäufung 2 ist schräg zulaufend ausgebildet. Das Maß a beträgt beispielsweise (im hier dargestellten vergrößerten Fall) in der Realität 2,5 mm, das Maß b beispielsweise 5 mm. Maximal bis zu einem Drittel des Durchmessers an der Basiskante 3 sollten die Materialanhäufungen 2 einnehmen.Indicated on the left in the cross section is the accumulation of material 2, which serves as a defect filler for surface defects in the natural joint ball. The accumulation of material 2 is formed tapered. The dimension a is for example (in the enlarged case shown here) in reality 2.5 mm, the dimension b, for example, 5 mm. Up to one third of the diameter at the base edge 3 should take the material accumulations 2.

Sämtliche Abschnitte des Kappeninneren sind mit einer offenmaschigen dreidimensionalen Raumnetzstruktur 4 versehen. Das Gleiche trifft zu für die Materialanhäufung 2, bei der die Raumnetzstruktur 5 zur stabilen Sekundärfixation beiträgt. All sections of the cap interior are provided with an open-mesh three-dimensional space network structure 4. The same applies to the material accumulation 2, in which the spatial network structure 5 contributes to stable secondary fixation.

Claims

Patentansprüche claims 1. Gelenkkopf-Kappenimplantat (1 ) für ein künstliches Hüftgelenk, aufweisend eine der äußeren Form der natürlichen Gelenkkugel nachgebildeten Kappe, die auf einen natürlichen Restgelenkkopf setzbar ist, bei dem im Inneren der Kappe Materialanhäufungen (2) vorgesehen sind zur Füllung von Oberflächendefekten in dem natürlichen Restgelenkkopf.An acetabulum cap implant (1) for an artificial hip joint comprising a cap modeled on the outer shape of the natural joint ball, which can be placed on a natural residual joint head, wherein material accumulations (2) are provided inside the cap for filling surface defects in the cap natural residual joint head. 2. Gelenkkopf-Kappenimplantat nach Anspruch 1 , bei dem die Materialanhäufungen (2) einstückig mit dem Material der Gelenkkappe (1) ausgebildet sind.2. condyle cap implant according to claim 1, wherein the material accumulations (2) are formed integrally with the material of the joint cap (1). 3. Gelenkkopf-Kappenimplantat nach Anspruch 1 oder 2, bei dem die Materialanhäufungen (2) bis zu einem Drittel des Durchmessers der Kappe (1) an ihrer Basiskante (3) in das Innere der Kappe (1 ) ragen.3. condyle cap implant according to claim 1 or 2, wherein the material accumulations (2) up to a third of the diameter of the cap (1) at its base edge (3) in the interior of the cap (1) protrude. 4. Gelenkkopf-Kappenimplantat nach einem der Ansprüche 1 bis 3, bei dem das Kappeninnere zumindest teilweise mit einer offenmaschigen dreidimensionalen Raumnetzstruktur (4) versehen ist.4. condyle cap implant according to one of claims 1 to 3, wherein the cap interior is at least partially provided with an open-mesh three-dimensional spatial network structure (4). 5. Gelenkkopf-Kappenimplantat nach Anspruch 4, bei dem auch die Materialanhäufungen (2) zumindest teilweise mit einer offenmaschigen dreidimensionalen Raumnetzstruktur versehen ist. 5. condyle cap implant according to claim 4, wherein the material accumulations (2) is at least partially provided with an open-mesh three-dimensional spatial network structure.
PCT/EP2005/012238 2005-02-08 2005-11-15 Condyle cap implant for an artificial hip joint WO2006084493A2 (en)

Priority Applications (1)

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GB0621783A GB2430375B (en) 2005-02-08 2005-11-15 Femoral head cap implant for an artifical hip joint

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DE102005006023A DE102005006023B3 (en) 2005-02-08 2005-02-08 Artificial implant cap for hip joint has internal packing material filling void to natural bone
DE102005006023.4 2005-02-08

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EP3607913B1 (en) * 2018-08-10 2021-07-07 Mathys AG Bettlach Femoral cap implant for hip resurfacing

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GB0621783D0 (en) 2006-12-20
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DE102005006023B3 (en) 2006-08-03
GB2430375B (en) 2009-05-13

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