DE4211345C1 - Two-shell acetabulum for hip joint prosthesis - has outer shell of metal with an external, open-cell or open-pore surface structure,and inner cell of plastics - Google Patents

Two-shell acetabulum for hip joint prosthesis - has outer shell of metal with an external, open-cell or open-pore surface structure,and inner cell of plastics

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Publication number
DE4211345C1
DE4211345C1 DE4211345A DE4211345A DE4211345C1 DE 4211345 C1 DE4211345 C1 DE 4211345C1 DE 4211345 A DE4211345 A DE 4211345A DE 4211345 A DE4211345 A DE 4211345A DE 4211345 C1 DE4211345 C1 DE 4211345C1
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DE
Germany
Prior art keywords
outer shell
shell
edge
open
smooth
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.)
Expired - Fee Related
Application number
DE4211345A
Other languages
German (de)
Inventor
Martin Dipl Ing Schug
Thomas Prof Dr Med Wolfram
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.)
ORTHODYNAMICS GMBH, DE
Original Assignee
S&G Implants GmbH
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Filing date
Publication date
Application filed by S&G Implants GmbH filed Critical S&G Implants GmbH
Priority to DE4211345A priority Critical patent/DE4211345C1/en
Application granted granted Critical
Publication of DE4211345C1 publication Critical patent/DE4211345C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • 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
    • 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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/305—Snap connection
    • 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
    • A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
    • A61F2002/30538—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting angular orientation
    • A61F2002/3054—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting angular orientation about a connection axis or implantation axis for selecting any one of a plurality of radial orientations between two modular parts, e.g. Morse taper connections, at discrete positions, angular positions or continuous positions
    • 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
    • A61F2002/30841—Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
    • 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
    • A61F2/32—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
    • 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
    • A61F2002/3429—Acetabular cups with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
    • 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

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

A smooth, texture-free outer zone (7) extends from the edge (5) in the direction of the apex (3) of the outer shell (2a), passing over and enclosing it. The smooth, texture-free outer zone widens to the edge of the outer shell. In the region of the outer zone is an anchoring component on the outer shell. The outer shell on its edge has an outwardly directed flange (10). The inner shell (20) contains an outwardly directed edge flange (26), which covers over the edge flange of the outer shell. On the basic surface (12) of the edge flange of the outer shell, several pins (14) are arranged, equally spaced, and in the adjacent locating surface (27) of the edge flange of the inner shell are corresp. recesses (30). USE/ADVANTAGE - For orthopaedic surgery,with natural movement freedom.

Description

Die Erfindung betrifft eine Pfanne einer Hüftgelenk-Endoprothese, mit einer Außenschale aus Metall, die außen eine offenzellige oder offenporige Oberflächenstruktur aufweist, und mit einer Innenschale.The invention relates to a cup of a hip joint endoprosthesis, with an outer shell made of metal, the outside an open-cell or open-pore surface structure has, and with an inner shell.

Aus der DE 32 28 113 C2 ist eine derartige Pfanne bekannt, die im Bereich des Acetabulums in den natürlichen menschlichen Beckenknochen eingesetzt wird und als prothetisches Lager für den Oberschenkelteil einer künstlichen Hüftprothese dient, der in den menschlichen Oberschenkelknochen implantiert wird. Dabei wird die Außenschale zementlos in einem entsprechend präparierten Acetabulum verankert, und die offenzellige Oberflächensturktur bietet die Möglichkeit, daß das menschliche Knochengewebe in die Oberflächenstruktur einwachsen und daher der Prothese einen festen Sitz verleihen kann. Da die bekannten Pfannen außen vollständig mit der offenzelligen oder offenporigen Oberflächenstruktur versehen sind, wächst der natürliche Knochen an der gesamten Außenfläche in die Außenschale ein. Dies hat zur Folge, daß im Bereich der prothetischen Pfanne der Beckenknochen seine während der natürlichen Gehbewegungen an sich vorhandene Beweglichkeit einbüßt und in diesem Bereich die wesentlich größere Steifigkeit des Metalls annimmt. Eine derartige partielle Aussteifung des Knochens kann zu unerwünschten Verfremdungen der natürlichen Bewegungsabläufe und damit zu Schmerzen und langfristig zu Lockerungen der Prothese führen.Such a pan is known from DE 32 28 113 C2 known in the area of the acetabulum in the natural human pelvic bone is used and as a prosthetic bearing for the thigh part an artificial hip prosthesis that is used in human Femur is implanted. Here the outer shell is cementless in one prepared acetabulum anchored, and the open cell  Surface structure offers the possibility that the human Bone tissue grow into the surface structure and therefore can give the prosthesis a firm fit. Because the well-known Pans outside completely with the open-cell or open-pore Surface structure, the natural grows Bones on the entire outer surface into the outer shell. This has the consequence that in the area of the prosthetic socket the Pelvic bone on during natural walking movements existing mobility loses and in this area the assumes much greater stiffness of the metal. Such one partial stiffening of the bone can lead to undesirable Alienation of natural movements and thus too Pain and long-term loosening of the prosthesis.

Aus der DE 38 22 153 A1 oder der DE 38 22 154 A1 sind Oberschenkelteile für Hüftendoprothesen bekannt, bei denen vorgegebene Bereiche des Verankerungsschafts mit einer porösen Oberflächenstruktur versehen sind.From DE 38 22 153 A1 or DE 38 22 154 A1 thigh parts for hip endoprostheses are known in which predetermined areas of the anchoring shaft with a porous surface structure are provided.

Aufgabe der Erfndung ist es daher, eine Pfanne der eingangs genannten Art derart weiterzubilden, daß auch nach dem Einbau der Pfanne die natürliche Beweglichkeit und Elastizität des Beckenknochens bei den natürlichen Bewegungsabläufen besser verwirklicht wird.The task of the invention is therefore to create a pan of the beginning mentioned type in such a way that even after installation the pan the natural mobility and elasticity of the Pelvic bone is better realized in the natural movements.

Diese Aufgabe wird bei der Pfanne der eingangs genannten Art durch eine glatte, strukturfreie Außenzone, die sich vom Rand in Richtung auf den Pol der Außenschale hin erstreckt, gelöst.This task is carried out in the pan of the type mentioned due to a smooth, structure-free outer zone, which extends from the edge into Extends towards the pole of the outer shell, solved.

Die Vorteile der Erfindung liegen insbesondere darin, daß auf der Außenfläche der Außenschale eine Zone vorgegeben wird, in der das Knochengewebe mit der Pfanne keine innige Einwachsverbindung eingehen, sondern vielmehr an dem angrenzenden Knochen zur Anlage kommen kann. Dadurch ist in dieser Zone eine Relativbewegung zwischen dem Knochengewebe und der Pfanne reaktionslos möglich, wodurch dem Beckenknochen relativ zur Außenschale insgesamt eine größere Beweglichkeit eingeräumt wird, so daß bei Implantation eines derartigen erfindungsgemäßen Pfannensystems die Bewegungsabläufe besser den natürlichen Bewegungsabläufen entsprechen. The advantages of the invention are in particular that a zone is specified for the outer surface of the outer shell, in the bone tissue with the pan is not an intimate ingrowth connection but rather on the adjacent bone can come to the plant. As a result, there is a relative movement in this zone between the bone tissue and the pan unresponsive possible, causing the pelvic bone relative to the outer shell as a whole a greater mobility is granted, so that at Implantation of such a cup system according to the invention the movements better the natural movements correspond.  

Außerdem erfolgt die Krafteinleitung im wesentlichen in dem obelfächenstrukturierten Bereich der Außenpfanne, der an den reaktiven spongiösen Bereich des Knochens angrenzt und mit Spongiosa-Trabekeln durchwachsen wird.In addition, the force is essentially introduced into the surface structure Area of the outer pan that connects to the reactive cancellous area adjacent to the bone and with cancellous trabeculae will grow through.

Gemäß einer besonders bevorzugten Ausführungsform der Erfindung erstreckt sich die glatte Außenzone über den Pol der Außenschale hinaus und schließt den Pol ein. Besonders bevorzugt nimmt die glatte, strukturfreie Außenzone zum Rand hin in ihrer Breite zu, um dem Beckenknochen ausreichend Bewegungsfreiheit zu geben.According to a particularly preferred embodiment of the invention the smooth outer zone extends over the pole of the outer shell out and includes the pole. The takes particularly preferably smooth, structure-free outer zone towards the edge in width, to give the pelvic bone sufficient freedom of movement.

Bevorzugt läßt sich außerdem in der glatten, strukturfreien Außenzone ein Verankerungselement, z. B. ein Ansatz an der Außenschale oder eine Knochenschraube vorsehen, welche im Bereich der Außenzone eine punktuelle Verankerung ermöglicht.Prefers an anchoring element can also be placed in the smooth, structure-free outer zone, e.g. B. an attachment to the outer shell or a bone screw provide which one in the area of the outer zone selective anchoring enables.

Bei einer bevorzugten Ausführungsform der Erfindung besitzt die Außenschale an ihrem offenen Rand einen radial nach außen gerichteten Randflansch, um die Verankerbarkeit und auch die Formsteifigkeit der Außenschale zu erhöhen. Die Innenschale besitzt bevorzugt ebenfalls einen Randflansch, der sich radial über den Randflansch der Außenschale erstreckt und diesen abdeckt, um eine Berührung des menschlichen Gewebes mit dem Metall der Außenschale zu verhindern.In a preferred embodiment of the invention, the Outer shell at its open edge a radially outward Edge flange to the anchorability and also the dimensional stability to increase the outer shell. The inner shell has also preferably an edge flange that extends radially over the Edge flange of the outer shell extends and covers this to a touch of the human tissue with the metal of the outer shell to prevent.

Besonders bevorzugt besitzt die glatte, strukturfreie Außenzone einen kleineren Außenradius als die strukturierte Außenzone. Bei einer Implantation wird eine derartige Pfanne vorteilhafterweise so weit in den vorbereiteten Acetabulum-Hohlraum eingedrückt, bis die glatte Außenzone zur Anlage an den angrenzenden Knochen kommt. Dabei wird die Oberflächenstruktur in das angrenzende Spongiosagewebe eingedrückt und komprimiert das Spongiosagewebe, wodurch das anschließende Wachstum neuen Spongiosagewebes, und damit das Einwachsen der Spongiosa-Trabekeln in die Poren oder Zellen der metallischen Oberflächenstruktur gefördert wird.The smooth, structure-free outer zone is particularly preferred a smaller outer radius than the structured outer zone. At Such a socket is advantageously used for implantation pressed so far into the prepared acetabular cavity, until the smooth outer zone is in contact with the adjacent bones is coming. The surface structure is in the adjacent Cancellous tissue is pressed in and compresses the cancellous tissue, causing the subsequent growth of new cancellous tissue, and thus the ingrowth of the cancellous trabeculae in the pores or Cells of the metallic surface structure is promoted.

Vorteilhafte Weiterbildungen der Erfindung sind durch die Merkmale der Unteransprüche gekennzeichnet.Advantageous developments of the invention are due to the features of the subclaims.

Im folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert.The following is an embodiment of the invention explained in more detail with reference to the drawing.

Es zeigt.It shows.

Fig. 1 einen Querschnitt durch eine Pfanne; Fig. 1 shows a cross section through a pan;

Fig. 2 eine perspektivische Aufsicht auf die Pfanne gemäß Fig. 1. FIG. 2 is a perspective top view of the pan according to FIG. 1.

In den Fig. 1 und 2 ist eine Pfanne dargestellt, die eine Außenschale 2 mit einer Innenschale 20 aufweist. Die Außenschale 2 besitzt näherungsweise die Form eines Hohlkugelabschnitts, mit einem Pol 3, durch den eine Rotationsachse 2a hindurch verläuft, und mit einem offenen umlaufenden Rand 5, an dem ein Randflansch 10 radial auswärts angeformt ist.In Figs. 1 and 2, a cup is shown which has an outer shell 2 having an inner shell 20. The outer shell 2 has approximately the shape of a hollow spherical section, with a pole 3 , through which an axis of rotation 2 a runs, and with an open peripheral edge 5 , on which an edge flange 10 is formed radially outward.

In der Außenschale 2 ist eine Innenschale oder Einsatz 20 eingesetzt, der an die Außenschalenform angepaßt ist und z. B. mittels eines umlaufenden Ansatzes 16 in eine in der Außenschale entsprechend vorhandene Umlaufnut 9 einrastbar ist. Die Innenschale 20 besteht aus Kunststoffmaterial, besitzt an ihrem offenen Rand ebenfalls einen Randflansch 26, der die Basisfläche 12 des Randflansches 10 der Außenschale 2 abdeckt und abgerundete Kanten 28 besitzt. Auf der Basisfläche 12 des Randflansches 10 der Außenschale 2 befinden sich in konstantem Abstand zueinander mehrere Stifte 14, die in entsprechende Ausnehmungen 30 des Randflansches 26 der Innenschale eingreifen und eine Preß- oder Paßverbindung zwischen Innenschale und Außenschale herstellen. In der Innenschale ist zentrisch oder exzentrisch ein Hohlraum 22 in Form eines Kugelabschnitts vorgesehen, in den der Kopf eines prothetischen Oberschenkelteils der Hüftprothese hineinragt und dort gelagert wird.In the outer shell 2 , an inner shell or insert 20 is used, which is adapted to the outer shell shape and z. B. by means of a circumferential projection 16 in a correspondingly existing circumferential groove 9 in the outer shell. The inner shell 20 consists of plastic material, also has an edge flange 26 at its open edge, which covers the base surface 12 of the edge flange 10 of the outer shell 2 and has rounded edges 28 . On the base surface 12 of the edge flange 10 of the outer shell 2 there are a plurality of pins 14 at a constant distance from one another, which engage in corresponding recesses 30 of the edge flange 26 of the inner shell and produce a press or fit connection between the inner shell and the outer shell. A cavity 22 in the form of a spherical section is provided centrally or eccentrically in the inner shell, into which the head of a prosthetic thigh part of the hip prosthesis protrudes and is stored there.

Wie in den Fig. 1 und 2 erkennbar ist, ist die Außenschale 2 außen mit einer offenzelligen oder offenporigen Oberflächenstruktur 8 versehen, die es ermöglicht, daß das natürliche angrenzende Knochengewebe in diese Oberflächenstruktur einwachsen kann, um einen besonders festen Knochen/Prothesen-Verbund zu verwirklichen.As can be seen in FIGS. 1 and 2, the outer shell 2 is provided on the outside with an open-cell or open-pore surface structure 8 , which makes it possible for the naturally adjacent bone tissue to grow into this surface structure in order to form a particularly strong bone / prosthesis composite realize.

Wie jedoch Fig. 1, insbesondere jedoch Fig. 2 entnehmbar ist, besitzt die Außenschale 2 eine glatte, strukturfreie Außenzone 7, die sich vom Rand 5 medial in Richtung auf den Pol 3 hin erstreckt und sich zum Rand 5 hin verbreitert. Alternativ ist es möglich, daß die glatte, strukturfreie Außenzone sich über den Pol hinaus erstreckt und den Pol 3 einschließt.However, as can be seen in FIG. 1, but in particular in FIG. 2, the outer shell 2 has a smooth, structure-free outer zone 7 which extends medially from the edge 5 in the direction of the pole 3 and widens towards the edge 5 . Alternatively, it is possible that the smooth, structure-free outer zone extends beyond the pole and includes the pole 3 .

In der glatten, strukturfreien Außenzone 7 ist, vgl. Fig. 2, ein Verankerungselement 6 angeformt. Anstelle eines angeformten Verankerungselements kann zur punktuellen Verankerung auch eine durch die Außenschale hindurch verlaufende Knochenschraube od. dgl. verwendet werden.In the smooth, structure-free outer zone 7 , cf. Fig. 2, an anchoring element 6 integrally formed. Instead of a molded-on anchoring element, a bone screw or the like running through the outer shell can also be used for the selective anchoring.

Wie sich insbesondere Fig. 1 entnehmen läßt, besitzt die glatte, strukturfreie Außenzone 7 einen Außenradius (R2), der kleiner ist als der Außenradius (R1) der strukturierten Außenzone 8. Im dargestellten Ausführungsbeispiel befindet sich die Oberflächenstruktur - in dem gewünschten Flächenabschnitt - erhaben auf der Außenfläche der Außenschale.As in particular Fig can. 1 below, has the smooth structure-free outer zone 7 has an outer radius (R2) which is smaller than the outer radius (R1) of the structured outer zone 8. In the illustrated embodiment, the surface structure - in the desired surface section - is raised on the outer surface of the outer shell.

Claims (9)

1. Pfanne einer Hüftgelenk-Endoprothese, mit einer Außenschale aus Metall, die außen eine offenzellige oder offenporige Oberflächenstruktur aufweist, und mit einer Innenschale, gekennzeichnet durch eine glatte, strukturfreie Außenzone (7), die sich vom Rand (5) in Richtung auf den Pol (3) der Außenschale (2) hin erstreckt.1. pan of a hip joint endoprosthesis, with an outer shell made of metal, which has an open-cell or open-pore surface structure on the outside, and with an inner shell, characterized by a smooth, structurally free outer zone ( 7 ), which extends from the edge ( 5 ) towards the Pole ( 3 ) of the outer shell ( 2 ) extends out. 2. Pfanne nach Anspruch 1, dadurch gekennzeichnet, daß die glatte, strukturfreie Außenzone (7) sich über den Pol (3) hinaus erstreckt und den Pol (3) einschließt.2. Pan according to claim 1, characterized in that the smooth, structure-free outer zone ( 7 ) extends beyond the pole ( 3 ) and includes the pole ( 3 ). 3. Pfanne nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sich die glatte, strukturfreie Außenzone (7) zum Rand (5) der Außenschale (2) hin verbreitert.3. Pan according to claim 1 or 2, characterized in that the smooth, structure-free outer zone ( 7 ) to the edge ( 5 ) of the outer shell ( 2 ) widens. 4. Pfanne nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß im Bereich der glatten, strukturfreien Außenzone (7) ein Verankerungselement (6) an der Außenschale (2) vorgesehen ist.4. Pan according to one of the preceding claims, characterized in that an anchoring element ( 6 ) is provided on the outer shell ( 2 ) in the region of the smooth, structure-free outer zone ( 7 ). 5. Pfanne nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Außenschale (2) an ihrem Rand (5) einen auswärtsgerichteten Randflansch (10) aufweist.5. Pan according to one of the preceding claims, characterized in that the outer shell ( 2 ) at its edge ( 5 ) has an outward edge flange ( 10 ). 6. Pfanne nach Anspruch 5, dadurch gekennzeichnet, daß die Innenschale (20) einen nach außen gerichteten Randflansch (26) enthält, der den Randflansch (10) der Außenschale (2) überdeckt.6. Pan according to claim 5, characterized in that the inner shell ( 20 ) contains an outwardly directed edge flange ( 26 ) which covers the edge flange ( 10 ) of the outer shell ( 2 ). 7. Pfanne nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß an der Basisfläche (12) des Randflansches (10) der Außenschale (2) mehrere Stifte (14) in gleichmäßigem Abstand angeordnet sind, und daß in der angrenzenden Anlagefläche (27) des Randflansches (26) der Innenschale (20) entsprechende Ausnehmungen (30) vorgesehen sind.7. Pan according to one of the preceding claims, characterized in that on the base surface ( 12 ) of the edge flange ( 10 ) of the outer shell ( 2 ) a plurality of pins ( 14 ) are arranged at a uniform distance, and that in the adjacent contact surface ( 27 ) of the Edge flange ( 26 ) of the inner shell ( 20 ) corresponding recesses ( 30 ) are provided. 8. Pfanne nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Randflansch (10) der Außenschale (2) und der Randflansch (26) der Innenschale (20) über einen vorgegebenen Umfangsabschnitt radial verbreitert sind.8. Pan according to one of the preceding claims, characterized in that the edge flange ( 10 ) of the outer shell ( 2 ) and the edge flange ( 26 ) of the inner shell ( 20 ) are radially widened over a predetermined peripheral portion. 9. Pfanne nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die glatte, strukturfreie Außenzone (7) einen kleineren Außenradius (R2) besitzt als die strukturierte Außenzone (8).9. Pan according to one of the preceding claims, characterized in that the smooth, structure-free outer zone ( 7 ) has a smaller outer radius (R2) than the structured outer zone ( 8 ).
DE4211345A 1992-04-04 1992-04-04 Two-shell acetabulum for hip joint prosthesis - has outer shell of metal with an external, open-cell or open-pore surface structure,and inner cell of plastics Expired - Fee Related DE4211345C1 (en)

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DE10022260A1 (en) * 2000-05-08 2001-11-29 Univ Heidelberg Endoprosthesis part for the joint replacement, use of the endoprosthesis part and manufacturing process for endoprosthesis parts
US8123815B2 (en) 2008-11-24 2012-02-28 Biomet Manufacturing Corp. Multiple bearing acetabular prosthesis
US8308810B2 (en) 2009-07-14 2012-11-13 Biomet Manufacturing Corp. Multiple bearing acetabular prosthesis
US8475505B2 (en) 2008-08-13 2013-07-02 Smed-Ta/Td, Llc Orthopaedic screws
US9358056B2 (en) 2008-08-13 2016-06-07 Smed-Ta/Td, Llc Orthopaedic implant
US9561354B2 (en) 2008-08-13 2017-02-07 Smed-Ta/Td, Llc Drug delivery implants
US9616205B2 (en) 2008-08-13 2017-04-11 Smed-Ta/Td, Llc Drug delivery implants
US9700431B2 (en) 2008-08-13 2017-07-11 Smed-Ta/Td, Llc Orthopaedic implant with porous structural member
US10842645B2 (en) 2008-08-13 2020-11-24 Smed-Ta/Td, Llc Orthopaedic implant with porous structural member

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022260A1 (en) * 2000-05-08 2001-11-29 Univ Heidelberg Endoprosthesis part for the joint replacement, use of the endoprosthesis part and manufacturing process for endoprosthesis parts
DE10022260C2 (en) * 2000-05-08 2002-06-06 Univ Heidelberg Endoprosthesis part for joint replacement, use of the endoprosthesis part and manufacturing process for endoprosthesis parts
US10349993B2 (en) 2008-08-13 2019-07-16 Smed-Ta/Td, Llc Drug delivery implants
US9561354B2 (en) 2008-08-13 2017-02-07 Smed-Ta/Td, Llc Drug delivery implants
US8475505B2 (en) 2008-08-13 2013-07-02 Smed-Ta/Td, Llc Orthopaedic screws
US8702767B2 (en) 2008-08-13 2014-04-22 Smed-Ta/Td, Llc Orthopaedic Screws
US9358056B2 (en) 2008-08-13 2016-06-07 Smed-Ta/Td, Llc Orthopaedic implant
US11426291B2 (en) 2008-08-13 2022-08-30 Smed-Ta/Td, Llc Orthopaedic implant with porous structural member
US10842645B2 (en) 2008-08-13 2020-11-24 Smed-Ta/Td, Llc Orthopaedic implant with porous structural member
US10357298B2 (en) 2008-08-13 2019-07-23 Smed-Ta/Td, Llc Drug delivery implants
US9616205B2 (en) 2008-08-13 2017-04-11 Smed-Ta/Td, Llc Drug delivery implants
US9700431B2 (en) 2008-08-13 2017-07-11 Smed-Ta/Td, Llc Orthopaedic implant with porous structural member
US8123815B2 (en) 2008-11-24 2012-02-28 Biomet Manufacturing Corp. Multiple bearing acetabular prosthesis
US9445903B2 (en) 2008-11-24 2016-09-20 Biomet Manufacturing, Llc Multi-bearing acetabular prosthesis
US8308810B2 (en) 2009-07-14 2012-11-13 Biomet Manufacturing Corp. Multiple bearing acetabular prosthesis
US9445904B2 (en) 2009-07-14 2016-09-20 Biomet Manufacturing, Llc Multiple bearing acetabular prosthesis

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