DE4213771C1 - Spinal disc endoprosthesis - has elastic core with rim beading between shaped cover plates with a screw bonding for implantation without adhesive - Google Patents

Spinal disc endoprosthesis - has elastic core with rim beading between shaped cover plates with a screw bonding for implantation without adhesive

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Publication number
DE4213771C1
DE4213771C1 DE19924213771 DE4213771A DE4213771C1 DE 4213771 C1 DE4213771 C1 DE 4213771C1 DE 19924213771 DE19924213771 DE 19924213771 DE 4213771 A DE4213771 A DE 4213771A DE 4213771 C1 DE4213771 C1 DE 4213771C1
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DE
Grant status
Grant
Patent type
Prior art keywords
cover plates
core
implant
adhesive
implantation
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
DE19924213771
Other languages
German (de)
Inventor
Hans Grundei
W Prof Dr Med Habil Arnold
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
Eska Medical GmbH and 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
Grant date

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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
    • A61F2/30767Special external and/or bone-contacting surfaces, 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
    • 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
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442Intervertebral or spinal discs, e.g. resilient
    • 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
    • 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
    • A61F2002/30004The prosthesis made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30016The prosthesis made from materials having different values of a given property at different locations within the same prosthesis differing in hardness, e.g. Vickers, Shore, Brinell
    • 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
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/3011Cross-sections or two-dimensional shapes
    • A61F2002/30112Rounded 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
    • 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
    • A61F2002/30108Shapes
    • A61F2002/3011Cross-sections or two-dimensional shapes
    • A61F2002/30182Other shapes
    • A61F2002/30187D-shaped or half-disc-shaped
    • 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
    • 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
    • A61F2002/30433Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
    • 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
    • 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
    • A61F2002/30535Special 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
    • 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
    • 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
    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30576Special structural features of bone or joint prostheses not otherwise provided for with extending fixation tabs
    • 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
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442Intervertebral or spinal discs, e.g. resilient
    • A61F2/4425Intervertebral or spinal discs, e.g. resilient made of articulated components
    • A61F2002/443Intervertebral or spinal discs, e.g. resilient made of articulated components having two transversal endplates and at least one intermediate component
    • 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
    • A61F2220/0041Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
    • 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
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028Shapes in the form of latin or greek characters
    • A61F2230/0034D-shaped
    • 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
    • A61F2250/00Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0019Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in hardness, e.g. Vickers, Shore, Brinell

Abstract

The endoprosthesis for a spinal disc (1) has two rigid cover plates (2,3) with an open mesh structure. The core (5) between them is of an elastic material. A ring beading (6) round the outer edge of the core (5) lies in matching troughs (11,12) round the cover plates (2,3). The cover plates (2,3) and the core (5) are held together by a screw bonding. USE/ADVANTAGE - The endoprosthesis is for the replacement of a disc in the spinal column as an implant. The structure is assembled as a compact implant, without adhesives, with a performance closely matching a natural spinal disc.

Description

Die Erfindung betrifft eine Bandscheibenendoprothese. The invention relates to an intervertebral disc prosthesis.

Grundsätzlich soll eine künstliche Bandscheibe sich verhalten wie eine natürliche Bandscheibe. Basically, an artificial disc to behave like a natural disc. Sie muß die Wirbelkörper voneinander beabstandet halten und jegliche Druckausübung auf Nerven oder das Rückenmark verhindern und eine Neigung innerhalb der Wirbelsäule um bis zu 5° abpuffern. It must hold the vertebral bodies apart from each other and prevent any pressure on nerves or the spinal cord and to buffer an inclination within the spine by up to 5 °.

Aus der EP-03 92 076 A1 ist eine Bandscheibenendoprothese bekannt, die aus zwei starren Deckplatten besteht, zwischen denen ein Kern aus einem Elastomer verklebt ist. From EP-03 92 076 A1 an intervertebral disc prosthesis is known, which consists of two rigid cover plates between which a core is bonded to an elastomer.

Grundsätzlich kann eine derartige Bandscheibenendoprothese ihre Wirkung nur dann entfalten, wenn es nach der Primärfixation der Endoprothese durch ein regelrechtes Einklemmen zwischen zwei Wirbelkörpern zu einer Sekundärfixation kommt, das Implantat also einen innigen Verbund mit den benachbarten Wirbelkörpern eingeht. Basically such intervertebral disc prosthesis can only take effect when it comes to the primary fixation of the endoprosthesis by a real installation between two vertebrae to a secondary fixation, so the implant enters into an intimate bond with the adjacent vertebral bodies. Wohl zu diesem Zwecke sind die erwähnten Deckplatten auf ihrer nach der Implantation den Wirbelkörpern zugewandten Außenseiten mit einer porösen Schicht versehen, in die Knochenmaterial einwachsen soll. Well for this purpose the above-mentioned cover plates are provided on their post-implantation facing outer sides of the vertebral bodies with a porous layer, to grow into the bone material. Der elastische Kern bei der bekannten Endoprothese schließt an den Stirnflächen des Implantats bündig mit den Deckplatten ab. The elastic core in the known endoprosthesis includes at the end faces of the implant is flush with the cover plates.

Das bekannte Implantat weist verschiedene Nachteile auf. The known implant has several disadvantages. Hervorgehoben an dieser Stelle werden die folgenden: Die Verklebung der Deckplatten mit dem elastischen Kern ist nicht unproblematisch im Hinblick auf eine zu fordernde Dauerbeständigkeit. Emphasized at this point are the following: The bonding of the cover plates with the elastic core is not unproblematic in terms of a demanding to durability. So können Körperflüssigkeiten zu einem Anlösen der Klebverbindung zumindest im Bereich der Stirnseiten des Implantats führen. Thus, body fluids can result in a partial dissolving of the adhesive bond at least in the region of the ends of the implant. Darüber hinaus können Reste des Lösungsmittels des Klebers oder gar Kleberkomponenten in dem umgebenden Gewebe zu Unverträglichkeiten führen. In addition, residues of the solvent of the adhesive or even adhesive components in the surrounding tissue can lead to incompatibilities. Desweiteren sei hier der bündige Abschluß des elastischen Kerns mit den Deckplatten angesprochen. Furthermore, the flush completion of the elastic core was addressed with the cover plates here. Kommt es nämlich zu den erwähnten Neigungen von bis zu 5°, so tritt das Material des Kerns im dorsalen Bereich aus den Konturen des Implantates aus in Folge einer Ausgleichsbewegung zu den dann wirkenden Kompressionskräften und kann dann unter Umständen zu einer höchst unerwünschten Druckbeaufschlagung des angrenzenden Spinalkanals führen. If, namely, the above-mentioned inclinations of up to 5 °, the material of the core due to a compensating movement occurs in the dorsal region of from the contours of the implant at the then acting compression forces, and can then in certain circumstances a highly undesirable pressurization of the adjacent spinal canal to lead.

Eine Bandscheibenendoprothese, die aus zwei sogenannten Abschlußplatten und einem dazwischen angeordneten Distanzstück besteht, ist bekannt geworden aus der DE 35 29 761 A1. An intervertebral disc endoprosthesis, consisting of two so-called end plates and an interposed spacer, has become known from DE 35 29 761 A1. Das Distanzstück besteht im wesentlichen aus einem konvexen Mittelteil mit planem ringförmigen Führungsrand und mit einem Ringwulst und kann beispielsweise aus Polyethylen oder aus Polyurethan bestehen. The spacer consists essentially of a convex central portion with a planar annular guide edge and with an annular bead and can for example consist of polyethylene or polyurethane. Wie diese Teile zu einer implantierbaren Einheit zusammengefügt sind, also beispielsweise durch ein Verkleben etc., läßt sich dieser Druckschrift nicht entnehmen. As these parts are assembled into an implantable device, ie for example by adhesive bonding, etc., this document does not reveal.

Zum technologischen Hintergrund seien noch die folgenden bekannt gewordenen Druckschriften genannt: DE 30 23 353 A1, DE 22 63 842 A1, EP 03 56 112 A1, EP 02 98 235 und EP 03 17 972. For technological background were still called the following have become known publications: DE 30 23 353 A1, DE 22 63 842 A1, EP 03 56 112 A1, EP 02 98 235 and EP 03 17 972nd

Vor diesem Hintergrund ist es nun die Aufgabe der vorliegenden Erfindung, eine Bandscheibenendoprothese anzugeben, die ohne Verwendung eines Klebers zu einer kompakten implantierbaren Einheit zusammengefaßt ist, gleichwohl aber die Funktionen einer natürlichen Bandscheibe in guter Annäherung ausüben kann. Against this background, it is now the object of the present invention to provide an intervertebral disc prosthesis, which is summarized without using an adhesive to form a compact implantable unit, but nevertheless may exercise the functions of a natural disc in good approximation.

Gelöst wird diese Aufgabe durch eine aus zwei starren Deckplatten mit offenmaschiger Außenstruktur und einem zwischen diesen gelagerten Kern aus einem elastischen Material bestehenden Bandscheibenendoprothesen, bei welcher der Kern in seinem äußeren Randbereich einen umlaufenden Ringwulst aufweist, der in entsprechend ausgebildeten umlaufenden Mulden in den Deckplatten liegt, und bei welcher die Deckplatten und der Kern mittels einer Schraubverbindung miteinander verspannt sind. This object is achieved consisting of a rigid of two cover plates with open mesh outer structure and mounted between these core of an elastic material intervertebral disc prostheses, in which the core has an encircling annular bead in its outer edge region, which is located in correspondingly shaped circumferential recesses in the cover plates, and wherein the cover plates and the core are braced together by means of a screw connection.

Die Teile der Endoprothese werden also durch eine Schraubverbindung zu einer kompakten Einheit zusammengefügt. The parts of the endoprosthesis are thus joined together by a screw connection to a compact unit. Die äußere Formgebung des Implantats ist in bekannter Weise in etwa nierenförmig oder gerundet dreieckig ausgeführt. The external shape of the implant is designed in a known way approximately kidney-shaped, or rounded triangular. Etwa im Zentrum dieser Form ist die Schraubverbindung zwischen den Teilen vorgesehen, wozu in den Deckplatten jeweils eine Bohrung vorgesehen ist, durch die die Schraube geführt werden kann, welche durch den Kern durch eine an der entsprechenden Stelle vorgesehenen Durchbohrung greift. Approximately in the center of this form, the threaded connection is provided between the parts, for which purpose in the cover plates in each case provided a bore, through which the screw can be guided, which reaches through the core by a provided at the corresponding position through bore. Die Schraubverbindung wird so fest angezogen, daß ein gewisser Kompressionsdruck auf den Kern ausgeübt wird. The screw is tightened so that a certain compression pressure is applied to the core. Ohne weitere Maßnahme bestünde - wie leicht einzusehen ist - die Gefahr, daß trotz der Vorspannung der Kern um die Achse der Schraubverbindung verdreht werden könnte. With no further action would be - as readily appreciated - the danger that could be rotated about the axis of the screw connection in spite of the bias of the core. Um dies zu vermeiden, ist die Ausgestaltung der umlaufende Ringwulst im äußeren Randbereich des Kerns vorgesehen. To avoid this, the configuration of the circumferential annular bead is provided in the outer peripheral region of the core. Dieser liegt in den erwähnten umlaufenden Mulden in den Deckplatten. This is in the mentioned encircling depressions in the cover plates. Diese Maßnahme bietet also die Gewähr einer Eigenzentrierung des elastischen Kerns. so this action will ensure a self-centering of the elastic core. Dieser besteht vorzugsweise aus Silikon. This is preferably made of silicone. Der Elastizitätsmodul von Silikon ist nämlich vergleichbar zu jenem des natürlichen Knorpels einer natürlichen Bandscheibe. The elastic modulus of silicone is in fact comparable to that of natural cartilage of a natural disc.

Vorzugsweise ist der Kern so dimensioniert, daß er nicht ganz bündig an den Stirnflächen des Implantats mit den Deckplatten abschließt, damit unter Belastung ein Heraustreten des Kernmaterials aus den Konturen des Implantats unmöglich ist. Preferably, the core is dimensioned so that it closes not quite flush with the end faces of the implant with the cover plates, so that a protrusion of the core material of the contours of the implant is impossible under load. Aber selbst wenn ein bündiger Abschluß vorliegt, ist gemäß einer vorteilhaften Weiterbildung des Implantats vorgesehen, daß der Kern dorsal gesehen in seiner Stirnfläche eine nutförmige Materialaussparung aufweist. But even if a flush closure is present, it is provided according to an advantageous development of the implant, that in its end face of the core dorsal has seen a groove-shaped material recess. Im Querschnitt bietet der Kern dann an seiner dorsalen Stirnfläche das Bild einer lippenförmigen Ausbildung, die Ausgleichsbewegungen des Materials unter Belastung zuläßt, ohne daß Kernmaterial die Konturen des Implantats verläßt, so daß die befürchtete Druckbeaufschlagung des Spinalkanals nicht auftreten kann. In the cross section of the core has then to its dorsal face of the image of a lip-shaped form, permits the compensating movements of the material under stress without the core material leaving the contours of the implant, so that the feared pressurization of the spinal canal can not occur. Um die dynamischen Eigenschaften des Implantats jenem einer natürlichen Bandscheibe noch weiter anzunähern, ist die Schraubverbindung gemäß einer vorteilhaften Ausführungsform speziell ausgebildet. Is the dynamic characteristics of the implant to that of a natural disc further to converge, the screw is designed specifically in accordance with an advantageous embodiment. So ist vorgesehen, daß die Schraubverbindung hergestellt ist durch eine Gewindeschraube und eine Gewindehülse mit jeweils einem halbkugelförmigen Kopf, wobei die Köpfe in pfannenartige Aufnahmen aufweisenden Einsätzen in den Deckplatten greifen. Thus, it is provided that the screw connection is made by a threaded bolt and a threaded sleeve, each with a semi-spherical head, said heads having in socket-like recording inserts engage the cover plates. Neigungswinkel bis zu 5° unter Belastung sind dabei ohne weiteres möglich. Inclination angle up to 5 ° under load are readily possible. Damit es aufgrund von Mikrobewegungen des Schrauben- bzw. Mutterkopfes in der jeweiligen pfannenartigen Aufnahme nicht zu bedenklichen Materialabtragungen kommen kann, bestehen die erwähnten Einsätze vorzugsweise aus abriebsarmem und reibungsarmem Material, beispielsweise Polyethylen. So that it can not come to objectionable material erosion due to micro-movements of the bolt or nut head in the respective pan-like accommodation, the said inserts are preferably made of abriebsarmem and low friction material, for example polyethylene.

Gemäß einem weiteren Aspekt der Erfindung ist in vorteilhafter Weiterbildung vorgesehen, daß die Außenseite jeder Deckplatte zur Horizontalebene des Kerns zu dessen dorsalen Stirnseite hin in einem Winkel im Bereich zwischen 2° und 4° geneigt sind. According to a further aspect of the invention is provided in an advantageous further development, that the outside of each cover plate are inclined to the horizontal plane of the core to its dorsal face side at an angle in the range between 2 ° and 4 °. Hierdurch nimmt das Implantat eine leicht keilförmige Gestalt an, so daß es bei der Implantation leichter in ventraler Richtung zwischen zwei Wirbelkörper eingesetzt werden kann. In this way, the implant assumes a slightly wedge-shaped configuration so that it can be used easily in the ventral direction between two vertebrae during implantation.

Die Erfindung wird anhand eines Ausführungsbeispiels anhand der Zeichnungen näher erläutert. The invention is further illustrated by an embodiment with reference to the drawings. Hierbei zeigt: Here shows:

Fig. 1 eine Aufsicht auf die Banscheiben endoprothese, Fig. Endoprosthesis 1 a plan view of the Banscheiben,

Fig. 2 eine Schnittansicht des Implantats aus Fig. 1. Fig. 2 is a sectional view of the implant in FIG. 1.

In Fig. 1 ist eine Aufsicht auf die erfindungsgemäße Bandscheibenendoprothese 1 dargestellt. In Fig. 1 is a plan view of the intervertebral disc prosthesis according to the invention 1 is shown. Wie hieraus ersichtlich, weist das Implantat eine in etwa nierenförmige Gestalt auf. As apparent from this, the implant has a kidney-shaped in such shape. Aus Fig. 1 ist die eine starre Deckplatte 2 erkennbar, die eine offenmaschige Außenstruktur 4 aufweist. From Fig. 1, a rigid cover plate 2 is seen to comprise an open-mesh outer structure 4. Diese dient zur Sekundärfixation des Implantats dadurch, daß Knochenmaterial der nach der Implantation an ihr anliegenden Wirbelkörper die Außenstruktur durchwachsen kann. This is used for secondary fixation of the implant characterized in that the bone material after implantation, applied to it vertebral body can grow through the outer structure. Etwa mittig durchgreift eine Gewindehülse die Deckplatte. Approximately centrally penetrates a threaded sleeve, the cover plate. Von dieser Gewindehülse ist in Fig. 1 lediglich der Kopf 8 erkennbar. From this threaded sleeve in FIG. 1, only the head 8 can be seen. Zwei Anschlagsbolzen 14 sind vorgesehen, um eine definierte Stellung des Implantats in der Wirbelsäule zu erzielen. Two stop pins 14 are provided in order to achieve a defined position of the implant in the spine.

Aus der Schnittansicht gemäß Fig. 2 wird deutlich, wie die beiden Deckplatten 2 und 3 den elastischen Kern 5 einfassen. From the sectional view of FIG. 2 it is clear how the two cover plates 2 and 3 enclose the elastic core 5. Der Kern 5 weist einen umlaufenden Ringwulst 6 auf, der in entsprechend ausgeformte umlaufende Mulden 11 und 12 in der Deckplatte 2 bzw. 3 liegt. The core 5 has a circumferential annular bead 6 which is located in correspondingly shaped circumferential hollows 11 and 12 in the cover plate 2 and 3 respectively. In der Fig. 2 ist die besonders bevorzugte Schraubverbindung dargestellt, die durch die Gewindeschraube 20 und die Gewindehülse 21 hergestellt ist. In FIG. 2, the particularly preferred screw connection is shown, which is made through the threaded screw 20 and the threaded sleeve 21. Die Gewindeschraube 20 und die Gewinderhülse 21 weisen jeweils einen halbkugelförmigen Kopf 7 bzw. 8 auf. The threaded screw 20 and the threaded lighter sleeve 21 each have a semi-spherical head 7 and 8 respectively. In die Deckplatten 2 und 3 ist jeweils ein Einsatz 9 bzw. 10 gesetzt, in denen jeweils eine pfannenartige Aufnahme 15 bzw. 16 vorgesehen ist. An insert is respectively 9 and 10 placed in the cover plates 2 and 3, in each of which a cup-like receptacle 15 and 16 is provided. Die pfannenartigen Aufnahmen 15 und 16 sind so dimensioniert, daß die halbkugelförmigen Köpfe 7 und 8 in ihnen eine Schwenkbewegung in allen Richtungen ausführen können. The cup-like receptacles 15 and 16 are dimensioned so that the semi-spherical heads 7 and 8 in them can perform a pivotal movement in all directions. Die Gewindehülse 21 greift im dargestellten Ausführungsbeispiel durch die Bohrung 23 im Kern 5 . The threaded sleeve 21 engages in the illustrated embodiment through the bore 23 in the core. 5

Die Einsätze 9 und 10 bestehen vorteilhafter Weise aus einem abriebsarmen und reibungsarmen Material, wie beispielsweise Polyethylen. The inserts 9 and 10 consist advantageously of a low-wear and low-friction material, such as polyethylene.

Der Kern 5 ist im dargestellten Fall so dimensioniert, daß er nicht über die Stirnkanten der Deckplatten 2 und 3 hinausragt. The core 5 is dimensioned in the case shown such that it does not extend beyond the end edges of the cover plates 2 and 3. FIG. Auch eine zusätzliche Sicherheit gegen eine eingangs erwähnte Druckbeaufschlagung des Spinalkanals, weist der Kern 5 dorsal gesehen in seiner Stirnfläche eine nutförmige Materialaussparung 13 auf, so daß sich auf dieser Seite eine etwa lippenartige Gestalt darbietet. Also, an additional security against an initially mentioned pressurization of the spinal canal, the core 5 in its end face seen dorsally a groove-shaped material recess 13, so that an approximately lip-like shape presents on this page.

Aus Fig. 2 wird darüber hinaus die Position der Anschlagsbolzen 14 auf jeder Deckplatte 2 und 3 ersichtlich. From Fig. 2, the position of the stop pin 14 on each top plate 2 and 3 it can be seen beyond. Diese legen sich nach der Implantation an den betreffenden Wirbelkörper an und verleihen dem Implantat eine definierte Lage. These lie in after implantation of the respective vertebral body and give the implant a defined position.

Die dargestellte und besonders bevorzugte Ausführungsform des Implantates gestattet es, daß die Deckplatten 2 und 3 sich zueinander in allen Richtungen bewegen können. The illustrated and particularly preferred embodiment of the implant makes it possible that the cover plates can move to each other in all directions. 2 and 3

Gemäß einem weiteren Aspekt sind die Außenseiten der Deckplatten 2 und 3 zur Horizontalebene H des Kerns 5 zu dessen dorsalen Stirnseite 22 hin geneigt, und zwar in einem Winkel α, der im Bereich von 2° bis 4° liegt. According to a further aspect, the outer sides of the cover plates 2 and 3 to the horizontal plane H of the core 5 are inclined to its dorsal face 22 and at an angle α, which lies in the range of 2 ° to 4 °.

Die Deckplatten 2 und 3 bestehen vorzugsweise aus körperverträglichem Metall, wie es aus der Endoprothetik bekannt ist. The cover plates 2 and 3 are preferably made of biocompatible metal, such as it is known from arthroplasty.

Claims (6)

  1. 1. Bandscheibenendoprothese ( 1 ), bestehend aus zwei starren Deckplatten ( 2 , 3 ) mit offenmaschiger Außenstruktur ( 4 , 4 ß) und einem zwischen diesen gelagerten Kern ( 5 ) aus einem elastischen Material, bei welcher der Kern ( 5 ) in seinem äußeren Randbereich einen umlaufenden Ringwulst ( 6 ) aufweist, der in entsprechend ausgebildeten umlaufenden Mulden ( 11 , 12 ) in den Deckplatten ( 2 , 3 ) liegt, und bei welcher die Deckplatten ( 2 , 3 ) und der Kern ( 5 ) mittels einer Schraubverbindung miteinander verspannt sind. 1. intervertebral disc prosthesis (1) consisting of two rigid cover plates (2, 3) with open mesh outer structure (4, 4 ß) and a bearing between the core (5) of an elastic material, wherein the core (5) external in its edge area has an encircling annular bead (6) in correspondingly formed circumferential troughs (11, 12) in the cover plates (2, 3), and in which the cover plates (2, 3) and the core (5) by means of a screw connection with each other are braced.
  2. 2. Bandscheibenendoprothese nach Anspruch 1, bei der der Kern ( 5 ) aus Silikon besteht. 2. An intervertebral disc endoprosthesis according to claim 1, wherein the core (5) consists of silicone.
  3. 3. Bandscheibenendoprothese nach Anspruch 1 oder 2, bei der die Schraubverbindung hergestellt ist durch eine Gewindeschraube ( 20 ) und eine Gewindehülse ( 21 ) mit jeweils einem halbkugelförmigen Kopf ( 7 , 8 ), wobei die Köpfe ( 7 , 8 ) in pfannenartige Aufnahmen ( 15 , 16 ) aufweisenden Einsätzen ( 9 , 10 ) in den Deckplatten ( 2 , 3 ) greifen. 3. An intervertebral disc endoprosthesis according to claim 1 or 2, wherein the screw connection is made by a threaded screw (20) and a threaded sleeve (21) each having a hemispherical head (7, 8), said heads (7, 8) (in socket-like receptacles 15, 16) having inserts (9, 10) in the cover plates (2, 3 access).
  4. 4. Bandscheibenendoprothese nach Anspruch 3, bei der die Einsätze ( 9 , 10 ) aus abriebsarmem und reibungsarmem Material besteht. 4. An intervertebral disc endoprosthesis according to claim 3, wherein the inserts (9, 10) consists of abriebsarmem and low friction material.
  5. 5. Bandscheibenendoprothese nach einem der Ansprüche 1 bis 4, bei der der Kern ( 5 ) dorsal gesehen in seiner Stirnfläche eine nutförmige Materialaussparung ( 13 ) aufweist. 5. intervertebral disc prosthesis comprising according to any one of claims 1 to 4, wherein the core (5) in its end face seen dorsally a groove-like material recess (13).
  6. 6. Bandscheibenendoprothese nach einem der Ansprüche 1 bis 4, bei der die Außenseite jeder Deckplatte ( 2 , 3 ) zur Horizontalebene (H) des Kerns ( 5 ) zu dessen dorsalen Stirnseite ( 22 ) hin in einem Winkel α geneigt sind, wobei α im Bereich 2° < α < 4° liegt. 6. An intervertebral disc endoprosthesis according to one of claims 1 to 4, wherein the outside of each cover plate (2, 3) to the horizontal plane (H) of the core (5) to its dorsal face (22) are inclined towards α in an angle, α in range 2 ° <α <4 °.
DE19924213771 1992-04-27 1992-04-27 Spinal disc endoprosthesis - has elastic core with rim beading between shaped cover plates with a screw bonding for implantation without adhesive Expired - Fee Related DE4213771C1 (en)

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DE4323595C1 (en) * 1993-07-15 1994-07-07 Eska Medical Gmbh & Co Partial spinal disc replacement
WO1997000054A1 (en) * 1995-06-19 1997-01-03 Sven Olerud An adjustable spacing device and a method of adjusting the distance between two vertebrae with the aid of said spacing device in spinal surgical operations
WO1999020209A1 (en) * 1997-10-17 1999-04-29 Depuy Acromed, Inc. Spinal disc prosthesis
WO2002047586A1 (en) 2000-12-13 2002-06-20 Eska Implants Gmbh & Co. Partial intervertebral disk replacement implant
DE10253169A1 (en) * 2002-11-14 2004-08-05 Sepitec Foundation Implant used in procedures for stiffening the vertebral column consists of a compression-resistant hollow body made from two open receptacles which are pressed apart with insertion of filler material
WO2004089259A1 (en) * 2003-04-07 2004-10-21 Cervitech, Inc. Prosthetic joint of cervical intervertebral discs
WO2005094734A1 (en) 2004-03-30 2005-10-13 Hjs Gelenk System Gmbh Artificial intervertebral disk
US6981989B1 (en) 2003-04-22 2006-01-03 X-Pantu-Flex Drd Limited Liability Company Rotatable and reversibly expandable spinal hydraulic prosthetic device
EP1610740A2 (en) * 2003-04-04 2006-01-04 Theken Disc, LLC Artificial disc prosthesis
WO2007017172A2 (en) 2005-08-04 2007-02-15 Taurus Gmbh & Co. Kg Orthopaedic medical device
US7419505B2 (en) 2003-04-22 2008-09-02 Fleischmann Lewis W Collapsible, rotatable, and tiltable hydraulic spinal disc prosthesis system with selectable modular components
US7828846B2 (en) 2002-09-12 2010-11-09 Biedermann Motech Gmbh Space keeper for vertebrae or intervertebral disks
US7959678B2 (en) 2004-05-18 2011-06-14 Zimmer Gmbh Intervertebral disk implant
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US8012212B2 (en) 2003-04-07 2011-09-06 Nuvasive, Inc. Cervical intervertebral disk prosthesis
US8435301B2 (en) 2002-08-15 2013-05-07 DePuy Synthes Products, LLC Artificial intervertebral disc implant
US8480742B2 (en) * 2005-08-02 2013-07-09 Perumala Corporation Total artificial disc

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Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4323595C1 (en) * 1993-07-15 1994-07-07 Eska Medical Gmbh & Co Partial spinal disc replacement
WO1997000054A1 (en) * 1995-06-19 1997-01-03 Sven Olerud An adjustable spacing device and a method of adjusting the distance between two vertebrae with the aid of said spacing device in spinal surgical operations
WO1999020209A1 (en) * 1997-10-17 1999-04-29 Depuy Acromed, Inc. Spinal disc prosthesis
WO2002047586A1 (en) 2000-12-13 2002-06-20 Eska Implants Gmbh & Co. Partial intervertebral disk replacement implant
DE10061975A1 (en) * 2000-12-13 2002-07-11 Eska Implants Gmbh & Co Intervertebral disc replacement implant part
DE10061975C2 (en) * 2000-12-13 2003-01-30 Eska Implants Gmbh & Co Intervertebral disc replacement implant part
US8435301B2 (en) 2002-08-15 2013-05-07 DePuy Synthes Products, LLC Artificial intervertebral disc implant
US8821576B2 (en) 2002-09-12 2014-09-02 Biedermann Technologies Gmbh & Co. Kg Intervertebral disk prosthesis
US8613768B2 (en) 2002-09-12 2013-12-24 Biedermann Technologies Gmbh & Co. Kg Space keeper for vertebrae or intervertebral disks
US7828846B2 (en) 2002-09-12 2010-11-09 Biedermann Motech Gmbh Space keeper for vertebrae or intervertebral disks
US7963994B2 (en) 2002-09-12 2011-06-21 Biedermann Motech Gmbh Intervertebral disk prosthesis
DE10253169A1 (en) * 2002-11-14 2004-08-05 Sepitec Foundation Implant used in procedures for stiffening the vertebral column consists of a compression-resistant hollow body made from two open receptacles which are pressed apart with insertion of filler material
EP1610740A4 (en) * 2003-04-04 2009-04-08 Theken Disc Llc Artificial disc prosthesis
EP1610740A2 (en) * 2003-04-04 2006-01-04 Theken Disc, LLC Artificial disc prosthesis
WO2004089259A1 (en) * 2003-04-07 2004-10-21 Cervitech, Inc. Prosthetic joint of cervical intervertebral discs
US8012212B2 (en) 2003-04-07 2011-09-06 Nuvasive, Inc. Cervical intervertebral disk prosthesis
US8147551B2 (en) 2003-04-07 2012-04-03 Cervitech, Inc. Method for implanting an intervertebral disk prosthesis
US7419505B2 (en) 2003-04-22 2008-09-02 Fleischmann Lewis W Collapsible, rotatable, and tiltable hydraulic spinal disc prosthesis system with selectable modular components
US6981989B1 (en) 2003-04-22 2006-01-03 X-Pantu-Flex Drd Limited Liability Company Rotatable and reversibly expandable spinal hydraulic prosthetic device
US7785369B2 (en) 2004-03-30 2010-08-31 Hjs Gelenk System Gmbh Artificial intervertebral disk
DE102004016032A1 (en) * 2004-03-30 2005-11-17 Hjs Gelenk System Gmbh Artificial intervertebral disc
WO2005094734A1 (en) 2004-03-30 2005-10-13 Hjs Gelenk System Gmbh Artificial intervertebral disk
DE102004016032B4 (en) * 2004-03-30 2006-07-13 Hjs Gelenk System Gmbh Artificial intervertebral disc
US8968407B2 (en) 2004-05-18 2015-03-03 Zimmer Gmbh Intervertebral disk implant
US7959678B2 (en) 2004-05-18 2011-06-14 Zimmer Gmbh Intervertebral disk implant
US8480742B2 (en) * 2005-08-02 2013-07-09 Perumala Corporation Total artificial disc
US8545561B2 (en) 2005-08-04 2013-10-01 Taurus Gmbh & Co. Kg Orthopaedic medical device
WO2007017172A2 (en) 2005-08-04 2007-02-15 Taurus Gmbh & Co. Kg Orthopaedic medical device
WO2007017172A3 (en) * 2005-08-04 2007-03-29 Terence Blacklock Orthopaedic medical device

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