DE4416605C1 - Inter-vertebral implant - Google Patents

Inter-vertebral implant

Info

Publication number
DE4416605C1
DE4416605C1 DE19944416605 DE4416605A DE4416605C1 DE 4416605 C1 DE4416605 C1 DE 4416605C1 DE 19944416605 DE19944416605 DE 19944416605 DE 4416605 A DE4416605 A DE 4416605A DE 4416605 C1 DE4416605 C1 DE 4416605C1
Authority
DE
Germany
Prior art keywords
characterized
legs
implant according
screw
surfaces
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
DE19944416605
Other languages
German (de)
Inventor
Charles Dipl Ing Wing
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.)
Aesculap AG
Original Assignee
Aesculap AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aesculap AG filed Critical Aesculap AG
Priority to DE9407806U priority Critical patent/DE9407806U1/en
Priority to DE19944416605 priority patent/DE4416605C1/en
Application granted granted Critical
Publication of DE4416605C1 publication Critical patent/DE4416605C1/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Classifications

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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
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/4455Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
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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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    • A61F2/4455Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
    • A61F2/447Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
    • AHUMAN NECESSITIES
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    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875Screwdrivers, spanners or wrenches
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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
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2002/448Joints for the spine, e.g. vertebrae, spinal discs comprising multiple adjacent spinal implants within the same intervertebral space or within the same vertebra, e.g. comprising two adjacent spinal implants
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    • A61F2220/0025Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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    • 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
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    • A61F2230/0013Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
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    • 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
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    • A61F2230/0017Angular shapes
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    • 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
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    • A61F2230/0026Angular shapes trapezoidal
    • AHUMAN NECESSITIES
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    • 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
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    • A61F2230/0028Shapes in the form of latin or greek characters
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    • A61F2230/0082Three-dimensional shapes parallelepipedal
    • AHUMAN NECESSITIES
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    • 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
    • A61F2250/0004Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
    • A61F2250/0006Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting angular orientation
    • 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
    • A61F2250/0004Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
    • A61F2250/0009Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting thickness
    • 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
    • A61F2310/00023Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Abstract

The support surfaces (12, 13) of the implant are formed by the outsides of parallel running arms (3, 4) of a U-shaped support body (1). In a rib (5) of the support body connecting the arms in one piece with one another, a tapped hole (8) is arranged in which a screw (9) is screwed. The screw locates on the inner surfaces (6, 7) of the arms adjacent to one another and bends the arms more or less outwards. The screw in its point area (10) conically narrows and is free of threads. The screw in the front third of the arms locates on their inner surface. The thickness of the arms from the rib joining them to the free end increases.

Description

Die Erfindung betrifft ein Zwischenwirbel-Implantat mit an benachbarten Wirbelkörpern anlegbaren Stützflächen und mit einer Verstellvorrichtung zum Ändern der relativen Lage der Stützflächen. The invention relates to an intervertebral implant with adjacent vertebral bodies can be placed against the support surfaces and with an adjustment device for changing the relative position of the support surfaces.

Nach der Entfernung von Zwischenwirbelkörpern besteht die Gefahr, daß benachbarte Wirbelkörper unmittelbar aufeinan derliegen und durch diese unnatürliche Fehlstellung Schä digungen sowohl des Stützapparates als auch der umgebenden Weichteile eintreten. After removal of the intermediate vertebral bodies is a risk that adjacent vertebrae immediately aufeinan derliegen and by this unnatural misalignment Schä endings both the supporting apparatus and the surrounding soft tissues occur.

Um dies zu vermeiden, ist es bekannt, die Zwischenwirbel körper nach der Entnahme durch ein Zwischenwirbel-Implantat zu ersetzen, beispielsweise in Form eines Quaders oder ei nes Keiles. To avoid this, it is known to replace the intervertebral body after removal of an intervertebral implant, for example in the form of a cuboid or egg nes wedge. Das Einsetzen derartiger Zwischenwirbelkörper ist schwierig, daher werden häufig Zwischenwirbelkörper eingesetzt, die nicht die erforderliche Größe haben. The onset of such intervertebral body is difficult, therefore, often intervertebral bodies are used that do not have the required size. Wenn die Zwischenwirbelkörper geringfügig kleiner gewählt wer den, ist das Implantieren leichter, jedoch kann die Stütz funktion nicht vollkommen erfüllt werden. When the intervertebral body chosen slightly less who the, implanting is easier, but the support can function not be fully met.

Es ist bereits bekannt, Zwischenwirbel-Implantate zu ver wenden, deren Außenstruktur nach dem Einsetzen durch eine geeignete Verstellvorrichtung verändert werden kann. It is already known to use intervertebral implants ver, the outer structure can be changed after insertion by suitable adjustment. So be schreibt beispielsweise die WO 92/14423 ein Zwischenwir bel-Implantat mit einem Zuganker, bei dem zwischen benach barten Stirnflächen des Implantates verschwenkbar angeord nete Seitenwandabschnitte durch einen Zuganker mehr oder weniger nach außen verschwenkt werden können. To be, for example, writes the WO 92/14423 a Zwischenwir bel-implant with a tie rod, wherein the pivotable between angeord designated herein Benach end faces of the implant side wall portions can be pivoted outward through a tie rod more or less. Zwar wird es dadurch möglich, die Größe des Zwischenwirbel-Implantates nach der Implantation zu verändern, der Aufbau eines sol chen Zwischenwirbel-Implantates ist jedoch außerordentlich kompliziert und läßt außerdem keine flächige Anlage der Stützfläche am Wirbelkörper zu, da die Stützflächen klein räumig verschwenkt werden müssen. While it is thereby possible to change the size of the intervertebral implant after implantation, the structure of a sol chen intervertebral implant, however, is extremely complicated and also makes no surface contact of the support surface to the vertebral body, as the supporting surfaces must be pivoted räumig small ,

Aus der EP 260044 B1 ist ein zweiteiliges Zwischenwirbel- Implantat bekannt, bei dem zwischen zwei Teilen Spreizkör per angeordnet sind, die ebenfalls durch Zuganker und axia le Verschiebung die Spreizflächen voneinander entfernen können. EP 260044 B1 discloses a two-part intervertebral implant is known, are arranged in which between two parts per Spreizkör that can remove the expanding of one another by tie rods and also axia le shift. Auch hier ist der Aufbau des Implantates relativ kompliziert, da eine größere Anzahl von Teilen notwendig ist. Again, the structure of the implant is relatively complicated, since a greater number of parts is necessary. Außerdem ergibt sich hier nur eine linienförmige Anla ge, da die Außenfläche dieses Implantats einen kreisförmi gen Querschnitt aufweist. In addition, only a line-shaped Appendices results here ge, since the outer surface of said implant comprises a kreisförmi gen cross-section.

Einen ähnlichen Aufbau eines Zwischenwirbel-Implantates be schreibt die WO 90/00037. A similar structure of an intervertebral implant be writes, WO 90/00037. Keilförmige Spreizelemente zwi schen zwei Stützflächen werden durch einen Zuganker mehr oder weniger einander angenähert und drücken dabei die Stützflächen auseinander. Wedge-shaped spreading interim rule two support surfaces are approximated by a tie rod more or less each other while pressing apart the support surfaces. Auch hier ist eine große Anzahl von Einzelteilen notwendig, die zu dem Zwischenwirbel- Implantat zusammengebaut werden müssen, so daß die Gefahr von Funktionsstörungen nicht auszuschließen ist. Again, a large number of individual parts is necessary to be assembled into the intervertebral implant, so that the risk can not be excluded malfunctions.

Es ist Aufgabe der Erfindung, ein gattungsgemäßes Zwischen wirbel-Implantat so zu verbessern, daß ein besonders einfa cher und robuster Aufbau und eine störungsfreie Funktion gewährleistet sind. It is an object of the invention to a generic intervertebral implant to improve so that a particularly simp cher and robust construction, and trouble-free operation is ensured.

Diese Aufgabe wird bei einem Zwischenwirbel-Implantat der eingangs beschriebenen Art erfindungsgemäß dadurch gelöst, daß die Stützflächen durch die Außenseiten der im wesentli chen parallel zueinander verlaufenden Schenkel eines U-för migen Stützkörpers gebildet werden, daß in einem die Schen kel einstückig miteinander verbindenden Steg des Stützkör pers eine Gewindebohrung angeordnet ist und daß in diese eine Schraube eingeschraubt ist, die an den zum freien Ende der Schenkel hin sich aneinander annähernden Innenflächen der Schenkel anliegt und die Schenkel dadurch entsprechend ihrer Einschraubtiefe mehr oder weniger nach außen aufbiegt. This object is achieved by an intervertebral implant of the initially described type according to the invention characterized in that the supporting surfaces of a U-för-shaped support body are formed by the outer sides of the surfaces in wesentli parallel extending legs, that the in the's kel integrally interconnecting web Stützkör pers is disposed a threaded bore and in that in that one screw is screwed which bears against the free end of the legs toward each other to approximate the inner surfaces of the legs and the legs, characterized bends up in accordance with its screwing more or less outwardly.

Es wird also im Gegensatz zu allen anderen bekannten Zwi schenwirbel-Implantaten mit Verstellmöglichkeit ein ein stückiger Stützkörper verwandt, in den als Verstellvorrich tung lediglich eine Schraube eingeschraubt ist. It is so unlike any other known vertebrate interim rule implants with related adjustment a a lump support body in the processing as Verstellvorrich only one screw is screwed. Diese Schraube liegt unmittelbar an den Innenflächen der Schenkel des Stützkörpers an und drückt diese je nach ihrer Ein schraubtiefe mehr oder weniger auseinander. This screw is located directly adjacent to the inner surfaces of the legs of the supporting body and presses them depending on their A screwing more or less apart. Dieses Zwi schenwirbel-Implantat ist äußerst einfach aufgebaut, da es lediglich aus zwei Teilen besteht, und es ermöglicht trotz dem sehr feinfühlig eine Verstellung der Stützflächen al lein durch Verbiegung der Schenkel nach außen. This interim rule intervertebral implant is extremely simple in construction as it consists only of two parts, and makes it possible despite the very sensitive adjustment of the support surfaces al lein by bending the legs outward. Diese ge ringfügige Verschwenkung der Stützflächen ist auch aus ana tomischer Sicht günstig, da auf diese Weise eine geringfü gige Lordosierung der Wirbelkörper erreicht werden kann, auch diese Größe läßt sich durch die Schraube besonders einfach justieren. This ge ringfügige pivoting of the support surfaces is also favorable from ana tomischer term as a geringfü dent lordosis of the vertebral bodies can be achieved in this way, even this size can be very easily adjusted through the screw. Dabei besteht noch die Möglichkeit, den Betrag der Aufspreizung zu variieren, indem unterschiedli che Schrauben in den Stützkörper eingeschraubt werden, ins besondere läßt sich dadurch auch der absolute Betrag der Verstellung einstellen, der pro Einschraubtiefe der Schrau be auftritt. Here, there is the possibility to vary the amount of spreading by are screwed differing che screws in the supporting body, in particular therefore also the absolute amount of displacement can be adjusted, which occurs be per screw-use screw.

Ein besonderer Vorteil der Aufbiegung der Schenkel ist auch darin zu sehen, daß dadurch ein Gleiten des Implantates in dorsaler Richtung mit Sicherheit verhindert wird, da der Wirbelzwischenraum in dieser Richtung sich verengt und das Implantat aufgrund seiner Keilform an einer weiteren Ver schiebung in dorsaler Richtung gehindert wird. A particular advantage of the bending of the legs can also be seen that a sliding of the implant, thereby preventing in the dorsal direction with certainty since the intervertebral space in this direction is narrowed and the implant displacement, due to its wedge shape on a further Ver prevented in the dorsal direction becomes.

Günstig ist es, wenn die Schraube sich in ihrem Spitzenbe reich konisch verjüngt, auf diese Weise kann eine größere Anlagefläche der Schraube an der Innenfläche erreicht wer den und damit auch eine geringere Reibung zwischen Schraube und Innenfläche beim Einschrauben. It is favorable when the screw tapers conically in its rich Spitzenbe, in this way, a larger contact surface of the screw reaches to the inner surface and thus who the lower friction between the screw and the inner surface during screwing. Dabei ist es weiterhin vorteilhaft, wenn die Schraube in ihrem Spitzenbereich ge windefrei ausgebildet ist. It is further advantageous if the screw in its tip portion ge formed threaded free.

Vorzugsweise liegt die Schraube im vorderen Drittel der Schenkel an deren Innenfläche an, so daß die Schenkel dann einmal durch den Steg am hinteren Ende und dann durch die Schraube im Bereich des vorderen Endes unterstützt werden. Preferably, the screw is located in the front third of the legs on to the inner surface thereof, so that the legs are then supported again by the web at the rear end and then by the screw in the region of the front end.

Günstig ist es, wenn sich die Dicke der Schenkel von dem die Schenkel verbindenden Steg zum freien Ende hin vergrößert. It is favorable when the thickness of the limb increases from the web connecting the legs towards the free end. Durch den Grad der Dickenänderung läßt sich im übri gen auch der Biegeverlauf des Schenkels in geringem Umfange beeinflussen, so daß gegebenenfalls der Biegeverlauf des Schenkels an die Form der Wirbelkörper angepaßt werden kann. By the degree of change in thickness can also gen course of the bending of the leg to a small extent influence the übri, so that where appropriate, the bending curve of the leg may be adapted to the shape of the vertebral bodies.

Die Innenflächen der unverbogenen Schenkel können eben aus gebildet sein. The inner surfaces of the unbent legs may just be formed from.

Günstig ist es, wenn zumindest die Stützflächen struktu riert sind. It is favorable when at least the supporting surfaces are riert struc. Dadurch erhält man eine Fixierung des Stützkör pers zwischen den Wirbelkörpern und außerdem kann diese Strukturierung dazu beitragen, daß das Knochenmaterial in den Stützkörper einwächst. This provides a fixing of the Stützkör pers between the vertebral bodies and, in addition this structure can contribute that the bone material grows into the support body.

Beispielsweise kann die Strukturierung durch von den Stütz flächen abstehende Dorne oder Spitzen gebildet werden oder durch in die Stützflächen eingearbeitete Vertiefungen. For example, the structure can be formed by surfaces of the support projecting pins or spikes or incorporated in the support surfaces by recesses. Die se können beispielsweise als Bohrungen oder Schlitze aus gebildet sein. The se can for example be formed as bores or slots from.

Besonders günstig ist es, wenn die Strukturierung durch ei ne poröse Beschichtung der Stützflächen gebildet wird, die gleichzeitig eine besonders knochenfreundliche Oberfläche sein kann, so daß das Knochenmaterial in diese Oberfläche einwächst. It is particularly advantageous if the structuring is formed by ei ne porous coating of the supporting surfaces, which may be a particularly bone-friendly surface at the same time, so that the bone material grows into this surface.

Vorzugsweise ist der Stützkörper in unverformtem Zustand quaderförmig ausgebildet. Preferably, the support body is cuboid in the undeformed state.

Bei einer besonderen Ausführungsform kann vorgesehen sein, daß der Stützkörper an seiner Stegseite von oben gesehen einseitig durch eine Abschrägung oder durch einen Bogen verkürzt ist. In a particular embodiment, it may be provided that the support body is unilateral seen on its web page from top shortened by a bevel or by an arc. Dadurch wird es möglich, insgesamt länger ausgebildete Stützkörper in dem Raum zwischen zwei Wirbeln unterzubringen, ohne daß die Stützkörper über den Quer schnitt der grob gesprochen kreisförmigen Wirbelkörper mit einer Ecke vorsteht. This makes it possible to accommodate a total of longer supporting body formed in the space between two vertebrae without the support body over the cross-section of the roughly circular vertebral body with a corner protruding. Die Vergrößerung der Stützfläche führt zu geringeren Flächenpressungen und damit zu einer geringe ren Gefahr, daß der Stützkörper in das Knochenmaterial ein sinkt. The enlargement of the support surface leads to lower contact pressures and thus that the supporting body will sink to a low risk ren in the bone material.

Die nachfolgende Beschreibung bevorzugter Ausführungsformen der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. The following description of preferred embodiments of the invention serves in conjunction with the drawings for a more detailed explanation. Es zeigen: Show it:

Fig. 1 eine Querschnittansicht durch eine Wirbel säule im Bereich zwischen zwei Wirbelkör pern mit zwei eingelegten Zwischenwirbel- Implantaten; Fig. 1 is a cross sectional view through a vertebral column in the region between two Wirbelkör pern with two intervertebral implants inserted;

Fig. 2 eine Längsschnittansicht durch eine Wir belsäule im Bereich zwischen zwei Wirbel körpern mit einem eingelegten Zwischenwir bel-Implantat und Fig. 2 is a longitudinal sectional view through an We belsäule in the region between two vertebral bodies with an inserted implant and bel-Zwischenwir

Fig. 3 eine perspektivische Ansicht eines Zwi schenwirbel-Implantates. Fig. 3 is a perspective view of an interim rule vertebrate implant.

Das Zwischenwirbel-Implantat der vorliegenden Erfindung um faßt einen im wesentlichen U-förmigen Stützkörper 1 mit ei nem quaderförmigen Querschnitt. The intervertebral implant of the present invention summarizes to a U-shaped substantially supporting body 1 with egg nem parallelepiped-shaped cross section. In diesem Stützkörper 1 ist ein Innenraum 2 mit trapezförmigem Querschnitt ausgenommen, so daß der Stützkörper 1 zwei im wesentlichen parallel zu einander verlaufende Schenkel 3 und 4 und einen im wesent lichen senkrecht dazu verlaufenden, die beiden Schenkel 3 und 4 miteinander verbindenden Steg 5 aufweist. In this support body 1, an inner space 2 is other than trapezoidal cross-section, so that the supporting body 1 two substantially parallel to each other extending legs 3 and 4 and a perpendicular thereto in Wesent union, the two legs 3 and 4 interconnecting web. 5 Durch den trapezförmigen Querschnitt des Innenraumes 2 sind die ebe nen Innenflächen 6 , 7 der Schenkel 3 , 4 derart gegeneinan der geneigt, daß sie sich zu den freien Enden der Schenkel 3 , 4 hin einander annähern. Due to the trapezoidal cross-section of the inner space 2, the ebe NEN inner surfaces 6, 7 of the legs 3, 4 of the gegeneinan so inclined that they approach to the free ends of the legs 3, 4 towards each other. Außerdem nimmt die Dicke der Schenkel 3 , 4 vom Steg 5 zu den freien Enden der Schenkel 3 , 4 hin zu. 4 also increases the thickness of the legs 3, the web 5 to the free ends of the legs 3, 4 towards.

Im Steg 5 befindet sich eine durchgehende Gewindebohrung 8 , in diese ist eine Schraube 9 eingeschraubt, die an ihrem freien Ende eine gewindefreie Anlagefläche 10 in Form eines Kegelstumpfes aufweist. In the web 5 there is a threaded through-bore 8, in such a screw 9 is screwed, which has in the form of a truncated cone at its free end a thread-free contact surface 10th Diese liegt im vorderen Drittel an den beiden Innenflächen 6 , 7 an und weitet den Innenraum 2 je nach Einschraubtiefe mehr oder weniger auf, das heißt die Schenkel 3 , 4 werden unter dem Einfluß der Schraube 9 elastisch nach außen gebogen. This is located in the front third of the two inner surfaces 6, 7 and widens the inner space 2, depending on the screw more or less, that is, the legs 3, 4 will be elastically bent under the influence of the screw 9 to the outside. Das Einschrauben der Schraube 9 kann dabei beispielsweise mit einem Mehrkantschlüssel 11 erfolgen, der in eine in der Zeichnung nicht dargestellte Mehrkantöffnung der Schraube eintaucht. The screwing of the screw 9 may, for example with a polygonal key 11 carried, immersed in a not shown in the drawing polygonal opening of the screw.

Die Außenflächen der Schenkel 3 , 4 bilden Stützflächen 12 , die bei unverformtem Stützkörper 1 im wesentlichen eben ausgebildet sind und die sich beim Einschrauben der Schrau be 9 in den Stützkörper 1 geringfügig nach außen wölben. The outer surfaces of the legs 3, 4 form supporting surfaces 12 which are formed flat in the undeformed supporting body 1 is substantially and which is be 9 bulge in the supporting body 1 slightly outwardly when screwing use screw. Diese Stützflächen 12 , 13 können in aus der Zeichnung nicht ersichtlicher Weise mit einer Struktur versehen sein, bei spielsweise können dort Spitzen oder Dorne aufgesetzt sein oder es können Löcher in die Stützfläche 12 , 13 eingebohrt sein. These support surfaces 12, 13 may be provided with a structure in not apparent from the drawing manner in play as there peaks or spikes can be placed or it can holes in the support surface 12 to be drilled. 13 Diese Strukturierung verbessert den Kontakt zu an der Stützfläche 12 anliegendem Knochengewebe. This structuring improves the contact abutting on the support surface 12 of bone tissue. Bei einer anderen Ausführungsform sind die Stützflächen 12 , 13 und eventuell der gesamte Stützkörper 1 mit einer rauhen Oberfläche be schichtet, beispielsweise mit einer mikroporösen Oberflä che, so daß einerseits die Rauhigkeit erhöht und anderer seits der Eingriff mit benachbartem Knochengewebe verbes sert werden können. In another embodiment, the support surfaces 12, 13 and possibly the entire support body 1 are provided with a rough surface be coated, che, for example, with a microporous Oberflä, on the other can be sert so that on the one hand, the roughness increased and part of the engagement with adjacent bone tissue verbes.

Der Stützkörper 1 und die Schraube 3 bestehen aus körper verträglichen Metallen, Metall-Legierungen oder Kunststof fen, beispielsweise aus Titan. The supporting body 1 and the screw 3 are made of biocompatible metals, metal alloys or Kunststof fen, for example of titanium.

Wie sich aus den Darstellungen der Fig. 1 und 2 ergibt, wird der Stützkörper 1 derart zwischen zwei benachbarte Wirbelkörper 14 eingelegt, daß die Stützflächen 12 und 13 flächig an den benachbarten Wirbelkörpern zur Anlage kom men. As is clear from the illustrations of FIGS. 1 and 2 shows the supporting body 1 is so inserted between two adjacent vertebral bodies 14, that the support surfaces 12 and 13 men kom surface of the adjacent vertebral bodies to the plant. Dabei werden zwischen jeweils zwei Wirbelkörper die Stützkörper 1 immer paarig eingelegt, die Stege 5 sind da bei in dorsaler Richtung orientiert, die freien Enden der Schenkel 3 und 4 in ventraler. The support body 1 are between two vertebral bodies always inserted in pairs, the lands 5 are oriented in the dorsal direction as at the free ends of the legs 3 and 4 in the ventral. Auf diese Weise ist es mög lich, die Schraube 9 vom Rücken her in den Stützkörper 1 mehr oder weniger tief einzuschrauben, um dadurch ein Auf biegen der Schenkel 3 , 4 zu erreichen und damit eine Verän derung des Abstandes und eventuell auch in geringem Umfange der gegenseitigen Orientierung der benachbarten Wirbelkör per 14 . In this way it is possible, please include, 9 deep screwing the screw more in the supporting body 1 or less from the back, thereby a to turn the arm 3, to reach 4, and thus a change Base of the distance and possibly also to a small extent the mutual orientation of the adjacent Wirbelkör per fourteenth Bei einfachstem Aufbau des Stützkörpers 1 können damit die notwendigen Stützfunktionen durch diesen übernom men werden. In the simplest configuration of the supporting body 1 so that the necessary support functions by these men can be taken over. Es ist besonders vorteilhaft, daß das Zwischen wirbel-Implantat in einfacher Weise auch wieder entfernt werden kann. It is particularly advantageous that this can also be removed between vortex implant in a simple manner. Es genügt nämlich dazu, die Schraube 9 soweit auszuschrauben, daß die Schenkel wieder in die unverformte Stellung gelangen, dann können die Stützkörper 1 in einfa cher Weise entnommen und gegebenenfalls ersetzt werden. It is sufficient to unscrew the screw 9 so far that the legs return to the undeformed position, the supporting body 1 can be removed in simp cher manner and can be replaced if necessary.

Während der bisher beschriebene Stützkörper quaderförmige Außenkonturen aufweist, ist es möglich, hiervon geringfügig abzuweichen. During the previously described support body having rectangular outer contours, it is possible thereof deviate slightly. Beispielsweise kann der quaderförmige Stütz körper 1 im Bereich des Steges 5 einen von oben her gesehen an einer Ecke abgeschrägten oder durch einen Bogen verkürz ten Querschnitt aufweisen, wie dies durch die gestrichelte Grenzlinie 15 in Fig. 1 dargestellt ist. For example, the block-shaped support may comprise a seen from the top chamfered at a corner, or by an arc verkürz th cross-section of the body 1 in the region of the bridge 5, as shown by the dotted boundary line 15 in Fig. 1. Ein in dieser Weise abgewandelte Stützkörper 1 ist an die Außenkontur des Wirbelkörpers 14 angepaßt und kann daher entsprechend län ger ausgebildet werden, ohne über die Kontur des Wirbelkör pers 14 hervorzustehen. A modified in this manner, the support body 1 is adapted to the outer contour of the vertebral body 14 and can therefore be formed according to Lan ger, without protruding beyond the contour of Wirbelkör pers fourteenth Da die beschriebenen Zwischenwir bel-Implantate zu einer Horizontalebene vollständig symme trisch aufgebaut sind, genügt es dabei, den in dieser Weise seitlich abgeschrägten oder mit einer bogenförmigen Kontur 15 versehenen Stützkörper 1 in unterschiedlicher Orientie rung einzusetzen, so daß auf der einen Seite die linke Ecke und auf der anderen Seite die rechte Ecke des Stützkörpers kürzer ausgebildet ist, wie dies in Fig. 1 dargestellt ist. Since the described Zwischenwir bel implants completely sym to a horizontal plane constructed symmetrical, it suffices, to in this way laterally bevelled or provided with an arc-shaped contour 15 of the support body 1 in different Orientie tion to use, so that on one side the left corner and the right corner of the support body is shorter on the other side, as shown in FIG. 1.

Claims (12)

1. Zwischenwirbel-Implantat mit an benachbarten Wirbel körpern anlegbaren Stützflächen und mit einer Ver stelleinrichtung zum Ändern der relativen Lage der Stützflächen, dadurch gekennzeichnet, daß die Stützflächen ( 12 , 13 ) durch die Außenseiten der im wesentlichen parallel zueinander verlaufenden Schenkel ( 3 , 4 ) eines U-för migen Stützkörpers ( 1 ) gebildet werden, daß in einem die Schenkel ( 3 , 4 ) einstückig miteinander verbinden den Steg ( 5 ) des Stützkörpers ( 1 ) eine Gewindebohrung ( 8 ) angeordnet ist und daß in diese eine Schraube ( 9 ) eingeschraubt ist, die an den zum freien Ende der Schenkel ( 3 , 4 ) hin sich aneinander annähernden In nenflächen ( 6 , 7 ) der Schenkel ( 3 , 4 ) anliegt und die Schenkel ( 3 , 4 ) dadurch entsprechend ihrer Ein schraubtiefe mehr oder weniger nach außen aufbiegt. 1. An intervertebral implant to adjacent vertebral bodies can be placed against the support surfaces and with a Ver adjusting device for changing the relative position of the support surfaces, characterized in that the supporting surfaces (12, 13) through the outer sides of the substantially parallel extending legs (3, 4 are formed) of a U-för-shaped support body (1), that the web (5) of the support body (1) is disposed a threaded bore (8) in a the legs (3, 4) integrally interconnected and in that in this a screw ( is screwed 9) attached to the free end of the legs (3, 4) towards the approaching to each other in nenflächen (6, 7) of the legs (3, 4) is applied and the legs (3, 4) characterized according to their A screw amount more or less bends up to the outside.
2. Implantat nach Anspruch 1, dadurch gekennzeichnet, daß die Schraube ( 9 ) sich in ihrem Spitzenbereich ( 10 ) konisch verjüngt. 2. The implant according to claim 1, characterized in that the screw (9) tapers conically in its tip area (10).
3. Implantat nach Anspruch 1 oder 2, dadurch gekenn zeichnet, daß die Schraube ( 9 ) in ihrem Spitzenbe reich ( 10 ) gewindefrei ausgebildet ist. 3. The implant according to claim 1 or 2, characterized in that the screw thread is formed in its free Spitzenbe rich (10) (9).
4. Implantat nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß die Schraube ( 9 ) im vor deren Drittel der Schenkel ( 3 , 4 ) an deren Innenflä che ( 6 , 7 ) anliegt. 4. Implant according to one of the preceding claims, characterized in that the screw (9) in front of the third of the legs (3, 4) at their che Innenflä (6, 7).
5. Implantat nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß sich die Dicke der Schen kel ( 3 , 4 ) von dem die Schenkel ( 3 , 4 ) verbindenden Steg ( 5 ) zum freien Ende hin vergrößert. 5. Implant according to one of the preceding claims, characterized in that the thickness of the kel's (3, 4) from the larger the legs (3, 4) connecting web (5) towards the free end.
6. Implantat nach Anspruch 5, dadurch gekennzeichnet, daß die Innenflächen ( 6 , 7 ) der unverbogenen Schenkel ( 3 , 4 ) eben sind. 6. The implant according to claim 5, characterized in that the inner surfaces (6, 7) of the unbent legs (3, 4) are planar.
7. Implantat nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß zumindest die Stützflä chen ( 12 , 13 ) strukturiert sind. 7. Implant according to one of the preceding claims, characterized in that at least the Stützflä surfaces (12, 13) are structured.
8. Implantat nach Anspruch 7, dadurch gekennzeichnet, daß die Strukturierung durch von den Stützflächen ( 12 , 13 ) abstehende Dorne oder Spitzen gebildet wird. 8. The implant according to claim 7, characterized in that the structuring is formed by the supporting surfaces (12, 13) projecting spikes or peaks.
9. Implantat nach Anspruch 7, dadurch gekennzeichnet, daß die Strukturierung durch in die Stützflächen ( 12 , 13 ) eingearbeitete Vertiefungen oder Durchbrüche ge bildet wird. Is forms 9. The implant according to claim 7, characterized in that the structuring by GE in the supporting surfaces (12, 13) incorporated recesses or breakthroughs.
10. Implantat nach Anspruch 7, dadurch gekennzeichnet, daß eine zusätzliche Strukturierung durch eine Be schichtung der Stützflächen ( 12 , 13 ) gebildet wird. 10. The implant according to claim 7, characterized in that an additional patterning by a coating loading of the support surfaces (12, 13) is formed.
11. Implantat nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß der Stützkörper ( 1 ) im unverformten Zustand quaderförmig ausgebildet ist. 11. Implant according to one of the preceding claims, characterized in that the supporting body (1) is cuboid in the undeformed state.
12. Implantat nach Anspruch 11, dadurch gekennzeichnet, daß der Stützkörper ( 1 ) an seiner Stegseite von oben gesehen einseitig durch eine Abschrägung oder durch einen Bogen ( 15 ) verkürzt ist. 12. The implant according to claim 11, characterized in that the supporting body (1) is one-sided seen in its web page from top shortened by a bevel or by an arc (15).
DE19944416605 1994-05-11 1994-05-11 Inter-vertebral implant Expired - Fee Related DE4416605C1 (en)

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