DE10218978A1 - Hip joint prosthesis with impact-protected prosthesis socket - Google Patents

Hip joint prosthesis with impact-protected prosthesis socket

Info

Publication number
DE10218978A1
DE10218978A1 DE10218978A DE10218978A DE10218978A1 DE 10218978 A1 DE10218978 A1 DE 10218978A1 DE 10218978 A DE10218978 A DE 10218978A DE 10218978 A DE10218978 A DE 10218978A DE 10218978 A1 DE10218978 A1 DE 10218978A1
Authority
DE
Germany
Prior art keywords
prosthesis
socket
damping element
hip
hip joint
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Withdrawn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
DE10218978A
Other languages
German (de)
Inventor
Uwe Bunz
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.)
Ceramtec GmbH
Original Assignee
Ceramtec GmbH
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 Ceramtec GmbH filed Critical Ceramtec GmbH
Priority to DE10218978A priority Critical patent/DE10218978A1/en
Priority to US10/242,283 priority patent/US6802866B2/en
Priority to EP02020744A priority patent/EP1295576A3/en
Publication of DE10218978A1 publication Critical patent/DE10218978A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30907Nets or sleeves applied to surface of prostheses or in cement
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006Properties of materials and coating materials
    • A61F2002/30065Properties of materials and coating materials thermoplastic, i.e. softening or fusing when heated, and hardening and becoming rigid again when cooled
    • A61F2002/30067Coating or prosthesis-covering structure made of thermoplastic material
    • AHUMAN NECESSITIES
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    • A61F2/00Filters 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
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    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006Properties of materials and coating materials
    • A61F2002/30069Properties of materials and coating materials elastomeric
    • A61F2002/3007Coating or prosthesis-covering structure made of elastic material, e.g. of elastomer
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    • A61F2002/3011Cross-sections or two-dimensional shapes
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    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The 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
    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30332Conically- or frustoconically-shaped protrusion and recess
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    • A61F2/00Filters 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
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    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30354Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
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    • A61F2/00Filters 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
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    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30563Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
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    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30593Special structural features of bone or joint prostheses not otherwise provided for hollow
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    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3609Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3611Heads or epiphyseal parts of femur
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3609Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625Necks
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3609Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/365Connections of heads to necks
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033Connections 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004Rounded shapes, e.g. with rounded corners
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063Three-dimensional shapes
    • A61F2230/0069Three-dimensional shapes cylindrical
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00011Metals or alloys
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00179Ceramics or ceramic-like structures

Abstract

Die Erfindung betrifft eine Hüftgelenkprothese mit einer äußeren Metallschale (5), einem inneren Pfanneneinsatz (4), in dem ein Kugelkopf (3) artikuliert, der Kugelkopf (3) mit einem metallischen Prothesenschaft (2) der femoralen Schaftkomponente verbunden ist und die Bewegung des Prothesenschaftes (2) durch einen Anschlag an den Rand des Pfanneneinsatzes (4) begrenzt ist. DOLLAR A Zur Verbesserung der Hüftgelenkprothese in Bezug auf den Anschlag des Prothesenschaftes an den Pfanneneinsatz wird vorgeschlagen, dass im Bereich des Anschlages des Prothesenschaftes (2) an den Pfanneneinsatz (4) auf der Umfangsfläche des Prothesenschaftes (2) ein weiches biokompatibles Dämpfungselement (1) aufgebracht ist.The invention relates to a hip joint prosthesis with an outer metal shell (5), an inner socket insert (4) in which a ball head (3) articulates, the ball head (3) is connected to a metal prosthesis shaft (2) of the femoral shaft component and the movement of the Prosthesis shaft (2) is limited by a stop on the edge of the socket insert (4). DOLLAR A To improve the hip joint prosthesis in relation to the abutment of the prosthesis socket on the socket insert, it is proposed that in the area of the abutment of the prosthesis socket (2) on the socket insert (4) on the peripheral surface of the prosthesis socket (2) a soft, biocompatible damping element (1) is applied.

Description

Die Erfindung betrifft eine Hüftgelenkprothese mit einer äußeren Metallschale, einem inneren Pfanneneinsatz in dem ein Kugelkopf artikuliert, der Kugelkopf mit einem metallischen Prothesenschaft der femoralen Schaftkomponente verbunden ist und die Bewegung des Prothesenschaftes durch einen Anschlag an den Rand des Pfanneneinsatzes begrenzt ist. The invention relates to a hip joint prosthesis with an outer metal shell, an inner socket in which a ball head articulates, the ball head with a metallic prosthetic stem of the femoral stem component is connected and the movement of the prosthesis stem by a stop on the Edge of the pan insert is limited.

Bei heutigen Prothesen wird die Bewegung der femoralen Schaftkomponente durch Maßnahmen an der Hüftgelenkspfanne limitiert. Es gibt verschiedene Ausführungsformen, z. B.

  • - Einen erhöhten Metallrand
  • - Einen erhöhten PE-Rand (PE = Polyethylen) bei Sandwich-Systemen (z. B. US 5,879,404)
  • - den PE-, Keramik- oder Metalleinsatz selbst
With today's prostheses, the movement of the femoral shaft component is limited by measures on the acetabular cup. There are various embodiments, e.g. B.
  • - A raised metal rim
  • - An increased PE edge (PE = polyethylene) in sandwich systems (e.g. US 5,879,404)
  • - the PE, ceramic or metal insert itself

Hierbei wird der Prothesenschaft zumeist nicht auf den Anschlagpartner hin optimiert. Bei Schaftprothesen sind oft drei Positionen des Prothesenschaftes zur Hüftgelenkspfanne möglich. In this case, the prosthesis socket is usually not aimed at the stop partner optimized. With stem prostheses, three positions of the prosthesis stem are often Hip joint socket possible.

Aus diesen genannten konstruktiven Ausführungen resultieren verschiedene Nachteile:

  • - Eine Optimierung der Schaftkomponente hinsichtlich Anschlag kann nicht erfolgen. Dadurch ist eine Adaptierung der Anschlaggeometrie zur Minimierung der vorliegenden Flächenpressung nicht möglich. Ferner ist eine Anpassung der Schaftkomponente auf alle mögliche Einbaulagen ebenfalls nicht möglich.
  • - Bei Anschlag des metallischen Schaftes an einen Metall- oder Keramikeinsatz wird Metallabrieb freigesetzt, der zu den bekannt negativen Auswirkungen führen kann.
  • - Bei Anschlag an PE kann aufgrund der hohen Flächenpressungen ein Fließen des PE nicht vermieden werden. Das Implantat wird instabil und es kann bei starker PE-Deformation zu Situationen kommen, in denen die Funktionstüchtigkeit des Implantats nicht gewährleistet ist.
  • - Das PE in der Hüftgelenkspfanne ist nicht auf möglichst gute Dämpfung des Schaftanschlages optimiert, da Material und Gestalt für den Einsatz als Gleitpartner optimiert sind. Es ist vor allem keine definierte Dämpfung des Anschlags möglich. Bei erhöhten Impulsenergien kann dies das Versagen eines Implantates zur Folge haben.
Various disadvantages result from these constructional designs mentioned:
  • - The shaft component cannot be optimized with regard to the stop. This means that it is not possible to adapt the stop geometry to minimize the existing surface pressure. Furthermore, an adaptation of the shaft component to all possible installation positions is also not possible.
  • - When the metallic shaft strikes a metal or ceramic insert, metal abrasion is released, which can lead to the known negative effects.
  • - Due to the high surface pressures, flow of the PE cannot be avoided when it is attached to PE. The implant becomes unstable and, in the event of severe PE deformation, situations can arise in which the functionality of the implant cannot be guaranteed.
  • - The PE in the acetabular cup is not optimized for the best possible cushioning of the shaft stop, since the material and shape are optimized for use as a sliding partner. Above all, no defined damping of the stop is possible. With increased pulse energies, this can result in the failure of an implant.

Der Erfindung liegt die Aufgabe zu Grunde, eine Hüftgelenkprothese nach dem Oberbegriff des Anspruchs 1 in Bezug auf den Anschlag des Prothesenschaftes an den Pfanneneinsatz zu verbessern. The invention is based on the object of a hip joint prosthesis Preamble of claim 1 in relation to the stop of the prosthesis socket to improve the pan insert.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass im Bereich des Anschlages des Prothesenschaftes an den Pfanneneinsatz auf der Umfangsfläche des Prothesenschaftes ein weiches, biokompatibles Dämpfungselement aufgebracht ist. According to the invention, this object is achieved in that Stop of the prosthesis socket on the socket insert on the peripheral surface of the prosthesis socket is a soft, biocompatible damping element is applied.

In bevorzugter Ausgestaltung ist das Dämpfungselement aus einem Kunststoff hergestellt, z. B. PE (Polyethylen), PEI (Polyetherimid), Silikon oder TPE (thermoplastischer Elastomer), um nur einige zu nennen. In a preferred embodiment, the damping element is made of a plastic manufactured, e.g. B. PE (polyethylene), PEI (polyetherimide), silicone or TPE (thermoplastic elastomer) to name a few.

Vorteilhafterweise ist die geometrische Ausgestaltung des Dämpfungselements an den korrespondierenden Rand des Pfanneneinsatzes angepasst, d. h. der Rand des Pfanneneinsatzes kann in das Dämpfungselement beim Anschlag eingreifen oder umgekehrt. The geometric configuration of the damping element is advantageous adapted to the corresponding edge of the pan insert, d. H. the The edge of the pan insert can be inserted into the damping element when it stops intervene or vice versa.

Hierzu sind bevorzugt in der zum Pfanneneinsatz gewandten Fläche des Dämpfungselements Einbuchtungen für den korrespondierenden Rand des Pfanneneinsatzes angeordnet. Diese Einbuchtungen bilden den Abdruck des Randes des Pfanneneinsatzes. For this purpose, the surface of the Damping element indentations for the corresponding edge of the Pan insert arranged. These indentations form the impression of the edge of the Socket insert.

Es kann von Vorteil sein, wenn das Dämpfungselement in seiner axialen Ausdehnung bis in den Kugelkopf hineinreicht. Hierdurch kann eine extrem gute Fixierung erreicht werden. It can be advantageous if the damping element is in its axial Extension extends into the ball head. This can be an extremely good one Fixation can be achieved.

In bevorzugter Ausgestaltung ist das Dämpfungselement ein Ring, vorteilhafterweise ein Ring mit einem Schlitz, der z. B. axial, schräg und/oder sägezahnartig ausgeführt sein kann. Durch den Schlitz ist eine einfache Montage des Dämpfungselements auf dem Prothesenschaft möglich. In a preferred embodiment, the damping element is a ring, advantageously a ring with a slot, the z. B. axially, obliquely and / or sawtooth-like can be executed. Through the slot is a simple assembly of the Damping element possible on the prosthesis socket.

Die Enden des Schlitzes sind vorteilhafterweise sich überlappend angeordnet, so dass im Falle eines Anschlages immer eine Dämpfung erzielt wird. The ends of the slot are advantageously arranged so as to overlap that damping is always achieved in the event of an attack.

In bevorzugter Ausführungsform sind zwischen dem Dämpfungselement und dem Prothesenschaft Hohlräume zur Aufnahme von Körperflüssigkeiten angeordnet. Beim Anschlag des Prothesenschaftes an den Pfanneneinsatz werden diese Hohlräume gestaucht bzw. zusammengedrückt und die Körperflüssigkeit herausgedrückt, so dass sich eine Dämpfung ergibt. In a preferred embodiment, between the damping element and the prosthesis socket cavities for the absorption of body fluids arranged. When the prosthesis socket is attached to the socket insert these cavities are compressed or compressed and the body fluid pushed out so that there is a damping.

Die Idee der vorliegenden Erfindung ist es eine im Vergleich zum metallischen Schaft weiche biokompatible Schicht auf den Prothesenschaft aufzubringen. Die geometrische Ausgestaltung dieser Schicht wird an die korrespondierende Hüftgelenkspfanne angepasst um die auftretenden Flächenpressungen im Fall eines Anschlages zu minimieren. Die konstruktive Ausführung der Hüftgelenkspfanne kann eine direktgeklemmte Ausführung, eine Sandwich-Ausführung, ein Pressfit- oder Schraubpfannen-System umfassen. Das Material dieser Zwischenschicht ist vorzugsweise ein Kunststoff (PE, PEI, Silikon, TPE, . . .). The idea of the present invention is one compared to the metallic one Apply soft, biocompatible layer to the prosthetic socket. The Geometric design of this layer is related to the corresponding one Hip socket adjusted to the surface pressures that occur in the event of a To minimize the stop. The constructive design of the acetabular cup can be a direct clamped version, a sandwich version, a press fit or screw pan system. The material of this intermediate layer is preferably a plastic (PE, PEI, silicone, TPE,...).

Nachfolgend die Vorteile dieser Erfindung im Vergleich zum Stand der Technik:

  • - Eine Optimierung hinsichtlich eines vergrößerten Bewegungsspielraumes (ROM) ist durch die Systembetrachtung möglich. Eine Anschlagoptimierung wurde bislang entweder am Prothesenschaft oder der Hüftgelenkspfanne vorgenommen. Diese definierten Anschläge wurden zum Teil (erhöhter Metallrand) mit einer Einschränkung des ROM erkauft. Durch die Betrachtung des Gesamtsystems und Abstimmung hinsichtlich Anschlag können in der weichen biokompatiblen Schicht Aussparungen bzw. Einbuchtungen eingebracht werden, die den ROM vergrößern.
  • - Eine Optimierung des Betriebszustandes Anschlag ist möglich:
    Dazu gehört eine Adaptierung der Anschlaggeometrie der weichen biokompatiblen Schicht zur Minimierung der vorliegenden Flächenpressung und eine Anpassung der Schaftkomponente auf alle möglichen Einbaulagen. Diese Einbaulagen werden definiert durch unterschiedliche Halslängen der Kugelköpfe.
  • - Bei Anschlag des Schaftes kann durch geeignete Materialwahl der weichen biokompatiblen Schicht nur wenig biokompatibles Material freigesetzt werden (kein Metallabrieb/kein PE-Fließen)
  • - Eine definierte Dämpfung des Anschlags ist möglich:
    Durch die Verwendung von Materialien mit hoher innerer Dämpfung und durch die Funktionstrennung von Gleitpartner und Dämpfungselement sind sowohl eine innere Dämpfung als auch konstruktive Dämpfungselemente möglich. Die Dämpfung wird über den Wert der inneren Dämpfung hinaus durch definiertes Entweichen von Körperflüssigkeiten (im wesentlichen Wasser) erreicht.
The following are the advantages of this invention compared to the prior art:
  • - Optimization with regard to increased freedom of movement (ROM) is possible through a system analysis. Up to now, stroke optimization has been carried out either on the prosthesis socket or the acetabular cup. These defined stops were partly bought (raised metal rim) with a restriction of the ROM. By considering the overall system and coordinating the stop, recesses or indentations can be made in the soft, biocompatible layer that enlarge the ROM.
  • - It is possible to optimize the operating state of the stop:
    This includes adapting the stop geometry of the soft, biocompatible layer to minimize the existing surface pressure and adapting the shaft component to all possible installation positions. These installation positions are defined by different neck lengths of the ball heads.
  • - When the shaft stops, only a little biocompatible material can be released through a suitable choice of material for the soft, biocompatible layer (no metal abrasion / no PE flow)
  • - A defined damping of the stop is possible:
    The use of materials with high internal damping and the functional separation of the sliding partner and damping element mean that both internal damping and structural damping elements are possible. The damping is achieved beyond the value of the internal damping by a defined escape of body fluids (essentially water).

Weitere Merkmale der Erfindung ergeben sich aus den Figuren, die nachfolgend beschrieben sind. Further features of the invention result from the figures that follow are described.

Fig. 1 zeigt in einem Querschnitt eine erfindungsgemäße Ausgestaltung einer Hüftgelenkprothese. Fig. 2 zeigt dieselbe Ausführungsform in einem vergrößerten Ausschnitt. Fig. 1 shows an embodiment according to the invention a hip joint prosthesis in a cross section. Fig. 2 shows the same embodiment in an enlarged section.

In einer äußeren Metallschale 5 ist ein keramischer Pfanneneinsatz 4 eingesetzt. Am unteren Ende ist in der Metallschale 5 eine Öffnung angeordnet. A ceramic pan insert 4 is inserted in an outer metal shell 5 . An opening is arranged in the metal shell 5 at the lower end.

Im Pfanneneinsatz 4 artikuliert ein keramischer Kugelkopf 3, der mit einem metallischen Prothesenschaft 2 der femoralen Schaftkomponente verbunden ist. Hierzu ist der Prothesenschaft 2 meist mit einer konischen Klemmverbindung in einer konischen Bohrung im Kugelkopf 3 verankert. A ceramic ball head 3 articulates in the socket insert 4 and is connected to a metallic prosthesis socket 2 of the femoral shaft component. For this purpose, the prosthesis socket 2 is usually anchored in a conical bore in the ball head 3 with a conical clamping connection.

Die Bewegung des Prothesenschaftes 2 ist durch einen Anschlag an den Rand des Pfanneneinsatzes 4 begrenzt. Im Bereich des Anschlages ist auf der Umfangsfläche des Prothesenschaftes 2 ein weiches biokompatibles Dämpfungselement 1 angeordnet. In der hier gezeigten Ausführungsform ist dieses Dämpfungselement als ein auf den Prothesenschaft 2 aufgeschobenen Ring ausgebildet. Der Ring besteht aus einem Kunststoff, wie z. B. Polyethylen (PE), PEI, Silikon oder TPE. The movement of the prosthesis socket 2 is limited by a stop on the edge of the socket insert 4 . In the area of the stop, a soft, biocompatible damping element 1 is arranged on the peripheral surface of the prosthesis socket 2 . In the embodiment shown here, this damping element is designed as a ring pushed onto the prosthesis socket 2 . The ring is made of a plastic, such as. B. polyethylene (PE), PEI, silicone or TPE.

Im Prothesenschaft 2 ist ein Einschnitt vorgesehen, in dem der Ring bzw. das Dämpfungselement 1 eingesetzt ist. An incision is provided in the prosthesis socket 2 , in which the ring or the damping element 1 is inserted.

Die geometrische Ausgestaltung des Dämpfungselements 1 ist an den korrespondierenden Rand des Pfanneneinsatzes 4 angepasst und zwar durch Einbuchtungen 6. Diese Einbuchtungen 6 sind so geformt, dass der Rand des Pfanneneinsatzes 4 in diese eingreifen kann. Hierdurch ist die maximale Bewegungsfreiheit des Prothesenschaftes 2 vergrößert. The geometric design of the damping element 1 is adapted to the corresponding edge of the socket insert 4 , specifically by indentations 6 . These indentations 6 are shaped so that the edge of the socket insert 4 can engage in them. As a result, the maximum freedom of movement of the prosthesis socket 2 is increased.

Die Fig. 3 und 4 zeigen eine ähnliche Ausführungsform wie die in den Fig. 1 und 2, nur ist hier das Dämpfungselement 1 in seiner axialen Ausdehnung bis in den Kugelkopf 3, bzw. die Bohrung im Kugelkopf 3, hineinreichend ausgebildet. FIGS. 3 and 4 show an embodiment similar to those shown in Figs. 1 and 2, except that here, the damping element 1 in its axial extent into the ball head 3, and the hole in the ball head 3 are formed in reaching.

Fig. 5 zeigt als Ansicht ein Dämpfungselement 1 mit einem axialen Schlitz 7, der zum Montieren des Dämpfungselements 1 auf dem Prothesenschaft 2 dient. Das Dämpfungselement 1 ist als Ring geformt und hat auf seiner Außenfläche drei umlaufende Einbuchtungen 6. Fig. 6 zeigt einen Schnitt entlang der Linie A-A von Fig. 5 durch das den Prothesenschaft 2 umgebende Dämpfungselement 1. Fig. 5 shows a view of a damping element 1 with an axial slot 7, which serves for mounting of the damping element 1 on the prosthesis stem 2. The damping element 1 is shaped as a ring and has three circumferential indentations 6 on its outer surface. FIG. 6 shows a section along the line AA from FIG. 5 through the damping element 1 surrounding the prosthesis socket 2 .

Fig. 7 zeigt als Ansicht ein Dämpfungselement 1 ähnlich wie das in Fig. 5 gezeigte Dämpfungselement, jedoch ist hier der Schlitz 7 schräg verlaufend angeordnet. Umlaufende Einbuchtungen 6 sind ebenfalls vorhanden. Fig. 8 zeigt eine Aufsicht auf das Dämpfungselement nach Fig. 7. Fig. 7 shows a view of a damping element 1 similar to the damping element shown in Fig. 5, but here the slot 7 is arranged obliquely. All-round indentations 6 are also present. FIG. 8 shows a top view of the damping element according to FIG. 7.

Fig. 9 zeigt als Ansicht ein Dämpfungselement 1 mit einem Schlitz 7, der sägezahnartig ausgeführt ist. In allen Ausführungsvarianten können sich die Enden des Schlitzes 7 überlappen. Die Einbuchtungen 6 sind dieselben wie in den vorhergehenden Figuren. Fig. 9 shows a view of a damping element 1 with a slot 7 , which is designed like a saw tooth. In all variants, the ends of the slot 7 can overlap. The indentations 6 are the same as in the previous figures.

Die Fig. 10a und 10b zeigen ein Dämpfungselement 1 mit Hohlräumen 8 auf der Innenseite zur Aufnahme von Körperflüssigkeiten. Diese Hohlräume 8 sind wie die Einbuchtungen 6 wellenförmig ausgebildet und sind durch einen Kanal 9 miteinander verbunden. Figs. 10a and 10b show a damping element 1 with cavities 8 on the inner side for receiving body fluids. These cavities 8 , like the indentations 6, are wave-shaped and are connected to one another by a channel 9 .

Fig. 10b zeigt einen Schnitt entlang der Linie A-A in Fig. 10a. FIG. 10b shows a section along the line AA in FIG. 10a.

Bei einem Anschlag des Prothesenschaftes 2 an den Rand des Pfanneneinsatzes werden diese Hohlräume 8 zusammengedrückt und die darin enthaltende Körperflüssigkeit - im wesentlichen Wasser, H2O - herausgedrückt. Hierdurch ergibt sich eine dämpfende Eigenschaft der Hohlräume 8. When the prosthesis socket 2 hits the edge of the socket insert, these cavities 8 are pressed together and the body fluid contained therein - essentially water, H 2 O - is pressed out. This results in a damping property of the cavities 8 .

Die Fig. 11 zeigt einen Schnitt durch einen Prothesenschaft 2 mit aufgesetztem Kugelkopf 3 und aufgesetztem Dämpfungselement 1 mit inneren Hohlräumen 8. Auf der oberen Ansicht von Fig. 11 sind auf dem Prothesenschaft 2 Erhebungen angeordnet und das Dämpfungselement 1 ist flach ausgebildet, wodurch die Hohlräume 8 geschaffen sind. FIG. 11 shows a section through a prosthesis socket 2 with a ball head 3 and a damping element 1 with internal cavities 8 . On the upper view of FIG. 11 2 elevations are on the prosthesis stem disposed and the damping element 1 is formed flat, whereby the cavities are created. 8

Auf der unteren Ansicht von Fig. 11 ist eine Ausführungsform gemäß Fig. 10a, b abgebildet, d. h. die Hohlräume 8 sind in das Dämpfungselement 1 integriert durch wellenförmige Einbuchtungen. An embodiment according to FIGS. 10a, b is shown on the lower view of FIG. 11, ie the cavities 8 are integrated into the damping element 1 by means of undulating indentations.

Claims (10)

1. Hüftgelenkprothese mit einer äußeren Metallschale (5), einem inneren Pfanneneinsatz (4) in dem ein Kugelkopf (3) artikuliert, der Kugelkopf (3) mit einem metallischen Prothesenschaft (2) der femoralen Schaftkomponente verbunden ist und die Bewegung des Prothesenschaftes (2) durch einen Anschlag an den Rand des Pfanneneinsatzes (4) begrenzt ist, dadurch gekennzeichnet, dass im Bereich des Anschlages des Prothesenschaftes (2) an den Pfanneneinsatz (4) auf der Umfangsfläche des Prothesenschaftes (2) ein weiches biokompatibles Dämpfungselement (1) aufgebracht ist. 1. Hip prosthesis with an outer metal shell ( 5 ), an inner socket insert ( 4 ) in which a spherical head ( 3 ) articulates, the spherical head ( 3 ) is connected to a metallic prosthesis socket ( 2 ) of the femoral shaft component and the movement of the prosthesis socket ( 2 is) limited by a stop at the edge of the socket insert (4), characterized in that applied in the region of the stop of the prosthesis shaft (2) to the socket insert (4) on the peripheral surface of the prosthesis shaft (2) a soft biocompatible damping element (1) is. 2. Hüftgelenkprothese nach Anspruch 1, dadurch gekennzeichnet, dass das Dämpfungselement (1) ein Kunststoff ist. 2. Hip prosthesis according to claim 1, characterized in that the damping element ( 1 ) is a plastic. 3. Hüftgelenkprothese nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die geometrische Ausgestaltung des Dämpfungselements (1) an den korrespondierenden Rand des Pfanneneinsatzes (4) angepasst ist. 3. Hip prosthesis according to claim 1 or 2, characterized in that the geometric configuration of the damping element ( 1 ) is adapted to the corresponding edge of the socket insert ( 4 ). 4. Hüftgelenkprothese nach Anspruch 3, dadurch gekennzeichnet, dass in der zum Pfanneneinsatz (4) gewandten Fläche des Dämpfungselementes (1) Einbuchtungen (6) für den korrespondierenden Rand des Pfanneneinsatzes (4) angeordnet sind. 4. Hip joint prosthesis according to claim 3, characterized in that (1) recesses (6) are disposed for the corresponding edge of the socket insert (4) in the side facing the socket insert (4) surface of the damping element. 5. Hüftgelenkprothese nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Dämpfungselement (1) in seiner axialen Ausdehnung bis in den Kugelkopf (3) reicht. 5. Hip joint prosthesis according to one of claims 1 to 4, characterized in that the damping element ( 1 ) extends in its axial extent into the ball head ( 3 ). 6. Hüftgelenkprothese nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Dämpfungselement (1) ein Ring ist. 6. Hip prosthesis according to one of claims 1 to 5, characterized in that the damping element ( 1 ) is a ring. 7. Hüftgelenkprothese nach Anspruch 6, dadurch gekennzeichnet, dass im Ring ein Schlitz (7) angeordnet ist. 7. A hip joint prosthesis according to claim 6, characterized in that a slot ( 7 ) is arranged in the ring. 8. Hüftgelenkprothese nach Anspruch 7, dadurch gekennzeichnet, dass der Schlitz (7) axial, schräg und/oder sägezahnartig ausgeführt ist. 8. A hip joint prosthesis according to claim 7, characterized in that the slot ( 7 ) is made axially, obliquely and / or sawtooth-like. 9. Hüftgelenkprothese nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die Enden des Schlitzes (7) sich überlappend angeordnet sind. 9. A hip prosthesis according to claim 7 or 8, characterized in that the ends of the slot ( 7 ) are arranged to overlap. 10. Hüftgelenkprothese nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass zwischen dem Dämpfungselement (1) und dem Prothesenschaft (2) Hohlräume (8) zur Aufnahme von Körperflüssigkeiten angeordnet sind. 10. Hip prosthesis according to one of claims 1 to 9, characterized in that between the damping element ( 1 ) and the prosthesis socket ( 2 ) cavities ( 8 ) are arranged for receiving body fluids.
DE10218978A 2001-09-19 2002-04-27 Hip joint prosthesis with impact-protected prosthesis socket Withdrawn DE10218978A1 (en)

Priority Applications (3)

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DE10218978A DE10218978A1 (en) 2001-09-19 2002-04-27 Hip joint prosthesis with impact-protected prosthesis socket
US10/242,283 US6802866B2 (en) 2001-09-19 2002-09-12 Hip joint prosthesis with abutment-protected prosthesis shaft
EP02020744A EP1295576A3 (en) 2001-09-19 2002-09-16 Hip joint prosthesis with an impact protected shaft

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DE10218978A DE10218978A1 (en) 2001-09-19 2002-04-27 Hip joint prosthesis with impact-protected prosthesis socket

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DE102011000474A1 (en) 2011-02-03 2012-08-09 Gottfried Wilhelm Leibniz Universität Hannover Endoprosthesis used for correction of hip joint, has joint surface forming region which is arranged at base portion made from titanium or titanium alloy
DE102012014160A1 (en) 2012-07-18 2014-05-15 Gottfried Wilhelm Leibniz Universität Hannover Method for manufacturing endoprosthesis, particularly hip-, knee- or shoulder endoprosthesis, involves providing base body made from titanium or titanium alloy and joint surface forming area which is arranged at base body

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Publication number Priority date Publication date Assignee Title
DE102011000474A1 (en) 2011-02-03 2012-08-09 Gottfried Wilhelm Leibniz Universität Hannover Endoprosthesis used for correction of hip joint, has joint surface forming region which is arranged at base portion made from titanium or titanium alloy
DE102012014160A1 (en) 2012-07-18 2014-05-15 Gottfried Wilhelm Leibniz Universität Hannover Method for manufacturing endoprosthesis, particularly hip-, knee- or shoulder endoprosthesis, involves providing base body made from titanium or titanium alloy and joint surface forming area which is arranged at base body

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