DE19509317A1 - Spinal column implant for mounting between vertebrae - Google Patents

Spinal column implant for mounting between vertebrae

Info

Publication number
DE19509317A1
DE19509317A1 DE1995109317 DE19509317A DE19509317A1 DE 19509317 A1 DE19509317 A1 DE 19509317A1 DE 1995109317 DE1995109317 DE 1995109317 DE 19509317 A DE19509317 A DE 19509317A DE 19509317 A1 DE19509317 A1 DE 19509317A1
Authority
DE
Grant status
Application
Patent type
Prior art keywords
ring
central
bottom
implant
thread
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.)
Granted
Application number
DE1995109317
Other languages
German (de)
Other versions
DE19509317B4 (en )
Inventor
Heinrich Ulrich
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.)
ULRICH GMBH & CO. KG, DE
Original Assignee
Ulrich Heinrich
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

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
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442Intervertebral or spinal discs, e.g. resilient
    • 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
    • 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
    • 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
    • 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
    • A61F2/46Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4611Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of spinal prostheses
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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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    • A61F2002/30331Connections 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
    • A61F2002/30362Connections 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 with possibility of relative movement between the protrusion and the recess
    • A61F2002/30364Rotation about the common longitudinal axis
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    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30405Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
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    • 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
    • A61F2002/30476Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/305Snap connection
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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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    • A61F2002/30476Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30507Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
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    • 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
    • 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
    • A61F2230/0006Rounded shapes, e.g. with rounded corners circular
    • 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
    • A61F2230/0065Three-dimensional shapes toroidal, e.g. ring-shaped, doughnut-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
    • 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

Abstract

The implant consists of two end rings (1,2) and a central ring (3). The central ring has internal thread which engages with external thread (5) of the bottom ring. The top ring (2) fits with a rim in an annular groove of the central ring (3) so that it can rotate relative to it. The central ring and the bottom ring have spanner holes to facilitate turning the central threaded ring on the bottom ring. The overall length of the implant is adjusted by rotating the threaded central ring.

Description

Die Erfindung betrifft ein Implantat zum Einsetzen zwischen Wirbelkörper der Wirbelsäule als Platzhalter bestehend aus zwei endständigen, zur Anlage an den angrenzenden Wirbeln bestimmten Implantatteilen und einem dazwischen befindlichen, mittigen Implantatteil, das mit den endständigen Implantatteilen jeweils drehbar um eine gemeinsame Achse verbunden ist, wobei das mittige Implantatteil mit einem der endständigen Implantatteile in einem mit der Drehachse koaxialen Gewinde verschraubt ist, so daß durch Verdrehen des mittigen Implantatteils die Länge des Implantats in Richtung der Drehachse veränderbar ist. The invention relates to an implant for insertion between vertebral bodies of the spinal column as a place holder consisting of two terminal, for bearing against the adjacent vertebrae particular implant parts and a therebetween, the central implant part, each of which is rotatably connected to the terminal implant parts about a common axis, wherein the central implant part is screwed to one of the terminal implant parts in a coaxial with the axis of rotation threads so that is variable by rotating the central implant part, the length of the implant in the direction of the axis of rotation.

Implantate dieser Art sind aus US-PS 4 657 550 bekannt und dienen als Platzhalter für aus der Wirbelsäule entfernte Wirbel oder Wirbelteile. Implants of this type are known from US Patent No. 4,657,550 and serve as placeholders for removed from the spinal vertebrae or vertebral parts. Die Implantate ermöglichen durch Verdrehen des mittigen Implantatteils eine Distraktion des das Implantat enthaltenden Wirbelsäulenbereichs. The implants provide by twisting the central implant part a distraction of the implant containing the spine area. Dabei sind beide endständigen Implantatteile mit dem mittigen Implantatteil durch je ein Gewinde verschraubt, wobei die beiden Gewinde in Längsrichtung der Wirbelsäule koaxial angeordnet sind und zueinander gegenläufigen Gewindesinn besitzen. In this case, both terminal implant parts are each screwed to the central implant part by a thread, the two threads are arranged in the longitudinal direction of the spinal column and have mutually opposite coaxial thread sense. Die beiden endständigen Implantatteile sind jeweils zweiteilig ausgebildet und bestehen je aus einer am angrenzenden Wirbel zur Anlage kommenden, zum Wirbel hin mit Dornen besetzten Druckplatte und einem Gewindebolzen, der mit einem Mehrkantkopf verdrehungsfest um die Bolzenachse in eine entsprechende Aufnahme in der Druckplatte eingesteckt ist. The two terminal implant parts are each formed in two parts and each consist of one on the adjacent vertebral-engaging, to the vortex towards occupied with thorns pressure plate and a threaded bolt with a polygonal head twisting firmly around the bolt axis in a corresponding recess in the pressure plate is inserted. Das mittige Implantatteil ist mit Gewindebohrungen für die Aufnahme der Gewindebolzen ausgebildet. The central implant part is formed with threaded holes for receiving the threaded bolts. Dieses bekannte Implantat hat den Nachteil, daß nach dem Einsetzen des Implantats die Knochenbildung und -regeneration zu wünschen übrig läßt. This known implant has leaves that to wish bone formation and regeneration after insertion of the implant the disadvantage left. Außerdem ist bei einem solchen Implantat die axiale Gesamtlänge mindestens so groß wie die Gesamtlänge der beiden gegensinnigen Gewinde, was eine Beschränkung hinsichtlich der kleinstmöglichen kürzesten Implantatlänge bedeutet, so daß diese bekannten Implantate nicht als Zwischenwirbelplatzhalter zum Bandscheibenersatz geeignet sind. In addition, the overall axial length is at least as large as the total length of the two opposing threads, which means a limitation of the smallest possible shortest length of the implant, so that these known implants are not suitable as an intervertebral space holder for the intervertebral disc replacement in case of such an implant.

In der EP 0 368 115 B1 ist ein als Platzhalter für einen Wirbel dienendes Implantat beschrieben, das als mantelförmiges Element mit Ausnehmungen in der Wandung ausgebildet ist, wobei der obere und untere Mantelrand wenigstens teilweise zackenförmig ausgebildet sind, um eine drehfeste Verbindung zwischen den zu verbindenden Wirbeln zu ergeben. In the EP 0,368,115 B1 a placeholder serving for an implant is described which is designed as envelope-shaped element with recesses in the wall, wherein the upper and lower cladding boundary are formed at least partly serrated in order to be connected to a rotationally fixed connection between the to yield vertebrae. Das Implantat ist aus einem mit den Ausnehmungen versehenen Blech ein- oder zweilagig gewickelt. The implant is one of a sleeve provided with the recesses or sheet wound in two layers. Durch die Ausnehmungen kann gewünschtenfalls ein in das Mantelinnere einzubringendes Material, wie Knochenzement oder Knochenstücke, eingefügt werden, wodurch ein schnellerer Gefäßanschluß mit dem Implantat erreicht wird. Through the recesses can be inserted if desired, to be introduced into the casing interior material such as bone cement or bone pieces, whereby a faster vessel connection is achieved with the implant. Nachteilig bei einem solchen Implantat ist, daß es in der Länge nicht verstellbar ist und keinerlei Distraktion der benachbarten Wirbel ermöglicht. A disadvantage of such an implant that it is not adjustable in length and not allow any distraction of the adjacent vertebrae.

Der Erfindung liegt die Aufgabe zugrunde, ein Implantat der eingangs genannten Art so auszubilden, daß es auf eine Mindestlänge einstellbar ist, die seine Verwendung als Zwischenwirbelplatzhalter zum Bandscheibenersatz ermöglicht, und daß es für die Induktion der Knochenbildung und Stimulation der Knochen besonders gut geeignet ist und daher nach der Implantation besonders leicht und schnell einwachsen kann. The object underlying the invention is to form an implant of the type mentioned such that it can be adjusted to a minimum length, which permits its use as an intervertebral space holder for the intervertebral disc replacement, and that it is particularly well suited for the induction of bone formation and stimulation of bone and therefore can grow more easily and quickly after implantation.

Diese Aufgabe wird nach der Erfindung bei einem Implantat mit den eingangs genannten Merkmalen dadurch gelöst, daß die beiden miteinander verschraubten Implantatteile als rohrförmige Hülsen mit zumindest im Bereich des Gewindes kreisförmigem Querschnitt und das andere endständige Implantatteil als Stirnring ausgebildet sind, der axial unverschiebbar und drehbar an der Hülsenwand des mittigen Implantatteils gelagert ist, und daß die Hülsenwände von Aussparungen durchbrochen sind. This object is achieved according to the invention for an implant with the features mentioned in that the two screwed-together parts of the implant circular cross-section and the other terminal implant part are as tubular sleeves having at least in the region of the thread formed as an end ring which is axially non-displaceably and rotatably on the sleeve wall of the central implant part is mounted, and that the sleeve walls of the recesses are broken.

Die erfindungsgemäße Ausbildung des Implantats aus zwei Hülsen und einem Stirnring läßt im Implantatinneren einen durchgehenden Hohlraum entstehen, der durch die in den Hülsenwänden befindlichen Aussparungen hindurch von mit der Implantataußenseite her zugänglich ist. The inventive construction of the implant of two sleeves and a front ring can occur in the implant inside a through cavity, which is accessible with the implant outside by the sleeve located in the walls of recesses therethrough. Dies zusammen mit der Möglichkeit, den Hohlraum mit Knochenzement oder patienteneigenen oder fremden Knochenspänen zu füllen, läßt das Implantat schnell und zuverlässig einwachsen. This along with the ability to fill the cavity with bone cement or the patient's own or someone else's bone grafts, the implant can grow quickly and reliably. Dennoch bleibt die Distraktionsmöglichkeit des Implantats während der Operation voll erhalten. Nevertheless, the Distraktionsmöglichkeit the implant during surgery is fully preserved. Da das Implantat nur ein einziges Gewinde besitzt, ist die mögliche Mindestlänge, auf die das Implantat verkürzend zusammengeschraubt werden kann, durch die Gewindelänge nur dieses einen Gewindes bestimmt, denn beide hülsenförmigen Implantatteile können praktisch völlig ineinander geschraubt und der das andere endständige Implantatteil bildende Stirnring kann axial sehr niedrig ausgebildet werden, was insgesamt eine sehr niedrige Bauform ergibt, die die Verwendung des Implantats zum Bandscheibenersatz ermöglicht. Since the implant only has a single thread, is the possible minimum length to which the implant can be screwed together shortening, by the length of the thread only that determines a thread, because both the sleeve-shaped implant elements can practically screwed together completely, and which may the other terminal implant part forming end ring are formed axially very low, which in total gives a very low profile design, which allows the use of the implant for an intervertebral disc replacement.

Eine bevorzugte Ausführungsform des erfindungsgemäßen Implantats ist dadurch gekennzeichnet, daß das mittige Implantatteil das mit ihm verschraubte endständige Implantatteil außenseitig axial übergreift, wobei das Gewinde jeweils als Außengewinde auf dem endständigen Implantatteil und als Innengewinde im mittigen Implantatteil ausgebildet ist. A preferred embodiment of the implant according to the invention is characterized in that the central implant part engages over the screw with him terminal implant part axially on the outside, wherein the thread is formed in each case as an external thread on the terminal implant part and a female thread in the central implant part. Diese Anordnung hat zur Folge, daß das Außengewinde des endständigen Implantatteils nach außen hin durch die Hülsenwand des mittigen Implantatteils abgedeckt ist. This arrangement has the consequence that the external thread of the terminal implant part to the outside through the sleeve wall of the central implant part is covered. Um im implantierten Zustand die Implantatteile gegen gegenseitiges Verdrehen zu sichern, kann das mittlere Implantatteil im Gewindebereich des endständigen Implantatteils mindestens eine radiale Gewindebohrung aufweisen, in der eine gegen das mit ihm verschraubte endständige Implantatteil verspannbare Klemmschraube geführt ist, die im verspannten Zustand beide Implantatteile gegeneinander fixiert. To secure the implant parts against mutual rotation in the implanted state, the middle implant part, the threaded portion of the terminal implant part can have at least one radial threaded bore in which a braced against the screw with him terminal implant part clamping screw is guided, which fixes both implant parts against each other in the clamped state ,

Die axial unverschiebbare, aber ebenfalls drehbare Verbindung zwischen dem mittigen Implantatteil und dem zweiten endständigen Implantatteil ist vorzugsweise von einer in einer zur Drehachse senkrecht stehenden Ebene verlaufenden, koaxialen, radial offenen Ringnut am einen Implantatteil und aus einer in die Ringnut vorstehenden koaxialen Ringleiste am anderen Implantatteil gebildet. The axially non-displaceable, but also rotatable connection between the central implant portion and the second terminal implant part is preferably of a straight line extending in a direction perpendicular to the rotational axis, coaxial, radially open annular groove on an implant part and a projecting coaxial in the annular groove annular ledge on the other implant part educated. Zweckmäßigerweise wird die Anordnung im einzelnen so getroffen, daß die radial nach außen offene Ringnut an einem axial vorstehenden Ringbund des mittigen Implantatteils und die radial nach innen gerichtete Ringleiste an einem den Ringbund außen umgreifenden, axialen Kragen des endständigen Implantatteils ausgebildet ist, wobei der Ringbund und die Ringleiste mit einander zugeordneten Kegelflächen versehen sind, über die beim axialen Zusammenstecken der beiden Implantatteile ein Einrasten der Ringleiste in die Ringnut möglich ist. Conveniently, the arrangement is made in detail so that the radially outwardly open annular groove projecting annular collar of the central implant part and the radially inwardly directed annular ledge is formed at a the annular collar the outside encompassing axial collar of the terminal implant part axially at one, wherein the annular collar and the annular strip are provided with mutually associated conical surfaces through which a locking bar of the ring is possible in the annular groove in the axial mating of the two implant parts. Um das Zusammenstecken der beiden Implantatteile und ihr Einrasten bei der Montage weiter zu erleichtern, sind die am Ringbund und an der Ringleiste stirnseitigen Ränder der Kegelflächen zweckmäßigerweise konvex gerundet. To facilitate the mating of the two implant parts and their locking during the assembly further, the end face on the annular collar and the annular ledge edges of the conical surfaces are suitably rounded convex. Im übrigen ist die axiale Höhe des mittigen Implantatteils einschließlich des mit ihm axial unverschiebbar verbundenen endständigen Implantatteils vorzugsweise gleich der Hülsenlänge des anderen, mit dem mittigen Implantatteil verschraubten Implantatteils. In addition, the axial height of the central implant part including the axially non-connected thereto terminal implant part is preferably equal to the sleeve length of the other, is screwed to the central implant part implant part. Das Implantat kann dann durch Ineinanderschrauben beider hülsenförmigen Implantatteile im wesentlichen bis auf die Hülsenlänge des endständigen Implantatteils verkürzt werden. The implant may then be shortened by screwing together the two sleeve-shaped implant elements substantially to the sleeve length of the terminal implant part.

Eine weiter bevorzugte Ausführungsform ist dadurch gekennzeichnet, daß die beiden endständigen Implantatteile am jeweils vom mittigen Implantatteil abgewandten Ende mit einer ringförmigen Stirnplatte und diese Stirnplatten an ihrer Stirnfläche mit zum Eindringen in die angrenzenden Wirbel bestimmten Schneiden oder Spitzen versehen sind. A further preferred embodiment is characterized in that the two terminal implant parts are provided on the respective side facing away from the central implant part end with an annular end plate and said end plates on its end face with for penetrating into the adjacent vertebra determined cutting edges or points. Dadurch können die endständigen Implantatteile an den angrenzenden Wirbeln gegen ungewünschte Verlagerungen gesichert werden. Thus, the terminal implant parts can be secured to the adjacent vertebrae to prevent unauthorized relocations. Im einzelnen können die Schneiden an jeder Stirnplatte jeweils parallel zueinander verlaufen. In detail, the cutting edges can each extend parallel to one another on each end plate. Es besteht weiter die besonders vorteilhafte Möglichkeit, je Stirnplatte zwei Gruppen senkrecht zueinander verlaufender Schneiden vorzusehen, die im Kreuzungspunkt von jeweils zwei Schneiden pyramidenartige Spitzen bilden. It is further particularly advantageous way, each end plate to provide two groups of perpendicular blades which form the intersection of two cutting pyramidal tips. Die Schneiden können auch radial verlaufen. The blades can also extend radially.

Nach einem weiteren Vorschlag der Erfindung besitzen die Stirnplatten beider endständigen Implantatteile und die äußere Umfangsfläche des mittigen Implantatteils den gleichen Außendurchmesser. According to another proposal of the invention the end plates of both terminal implant parts and the outer peripheral surface of the central implant part having the same outside diameter. Auch empfiehlt es sich, die Anordnung so zu treffen, daß der Innendurchmesser der Stirnplatte des axial unverschiebbar mit dem mittigen Implantatteil verbundenen endständigen Implantatteils gleich dem Außendurchmesser des mit dem mittigen Implantatteil verschraubten endständigen Implantatteils ist. Also, it is recommended to make the arrangement such that the inner diameter of the end plate of the terminal implant portion axially immovably connected to the central implant part is equal to the outer diameter of the screw with the central implant part end implant part. Im übrigen empfiehlt es sich, daß zwischen der Stirnplatte und der Hülsenwand des mit dem mittigen Implantatteil verschraubten endständigen Implantatteils eine über den Umfang verlaufende Hohlkehle ausgebildet ist. Incidentally, it is recommended that an axis extending through the peripheral groove is formed between the end plate and the sleeve wall of the screw with the central implant part end implant part.

Bezüglich der Ausbildung und Anordnung der Aussparungen in den Hülsenwänden der miteinander verschraubten Implantatteile besteht im Rahmen der Erfindung eine gewisse Wahlfreiheit. With respect to the design and arrangement of the recesses in the sleeve walls of the implant parts are screwed together is within the scope of the invention, a certain freedom of choice. Einerseits soll der von den Aussparungen insgesamt repräsentierte lichte Querschnitt möglichst groß sein, andererseits dürfen die Aussparungen die Gewindebereiche nicht unzulässig schwächen, damit die Festigkeit der Gewindeverbindung zwischen den Implantatteilen keine Beeinträchtigung erfährt. On the one hand the total represented by the recesses clear cross section should be as large as possible, on the other hand, the recesses must not unduly weaken the threaded portions, so that the strength of the threaded connection between the implant components undergoes no deterioration. Im allgemeinen wird man dabei die Aussparungen als im Querschnitt kreisförmige Bohrungen oder als Langlöcher ausbilden. In general, one will thereby forming the recesses than in the cross-sectional circular holes or as slots. Zweckmäßigerweise sind die Aussparungen gleichmäßig über den Hülsenumfang verteilt und am mittigen Implantatteil als Schlüsselöffnungen zum Einstecken eines zum Verdrehen des mittigen Implantatteils dienenden Schlüssels ausgebildet. Conveniently, the recesses are uniformly distributed over the sleeve circumference and formed at the central implant part as key openings for insertion of a serving to rotate the central implant part key. Die Aussparungen im mittigen Implantatteil können im lichten Querschnitt größer als im mit ihm verschraubten endständigen Implantatteil sein. The recesses in the central implant part can be larger than in screwed terminal with him implant part in its internal cross-section.

Im folgenden wird die Erfindung an einem in der Zeichnung dargestellten Ausführungsbeispiel näher erläutert; In the following the invention is explained closer to a shown in the drawings embodiment; es zeigen: show it:

Fig. 1 ein Implantat nach der Erfindung in einer Seitenansicht und in dem Zustand, in dem es auf seine größtmögliche axiale Länge eingestellt ist, Fig. 1 shows an implant according to the invention in a side view and in the state in which it is set to its maximum axial length,

Fig. 2 den Gegenstand der Fig. 1, jedoch im Zustand, in dem das Implantat auf seine kürzestmögliche Länge eingestellt ist, Fig. 2 shows the object of Fig. 1, but in the state in which the implant is adjusted to its shortest possible length,

Fig. 3 eine Seitenansicht nur des einen endständigen Implantatteils, Fig. 3 is a side view only of the one end implant part,

Fig. 4 den Schnitt IV-IV in Fig. 3, Fig. 4 shows the section IV-IV in Fig. 3,

Fig. 5 eine Draufsicht auf das Implantatteil nach Fig. 3 in nur teilweiser Darstellung, Fig. 5 is a plan view of the implant portion of FIG. 3 in only partial representation,

Fig. 6 eine Seitenansicht nur des mittigen Implantatteils, Fig. 6 is a side view only of the central implant part,

Fig. 7 den Schnitt VII-VII in Fig. 6, Fig. 7 shows the section VII-VII in Fig. 6,

Fig. 8 einen Axialschnitt durch das Implantatteil nach Fig. 6, Fig. 8 is an axial section through the implant portion of FIG. 6,

Fig. 9 das in Fig. 6 mit IX gekennzeichnete Detail in vergrößerter Darstellung, FIG. 9, indicated in Fig. 6 with IX detail in enlarged scale;

Fig. 10 das zweite endständige Implantatteil in einer Seitenansicht, Fig. 10, the second terminal implant part in a side view;

Fig. 11 eine Draufsicht auf das Implantatteil nach Fig. 10, Fig. 11 is a plan view of the implant portion of FIG. 10,

Fig. 12 den Schnitt XII-XII in Fig. 11 und Fig. 12 shows the section XII-XII in Fig. 11 and

Fig. 13 das in Fig. 12 mit XIII bezeichnete Detail in vergrößerter Darstellung. Fig. 13, indicated in Fig. 12 with XIII detail in an enlarged view.

Das in den Fig. 1 und 2 dargestellte Implantat dient zum Einsetzen zwischen in der Zeichnung selbst nicht dargestellte Wirbel als Platzhalter zum Bandscheibenersatz. The implant shown in Figs. 1 and 2 serves for insertion between itself is not shown in the drawing as a placeholder for vertebral disc replacement. Das Implantat besteht aus zwei endständigen, zur Anlage an den angrenzenden Wirbeln bestimmten Implantatteilen 1 , 2 und einem dazwischen befindlichen, mittigen Implantatteil 3 . The implant consists of two terminal, for bearing against the adjacent vertebrae implant certain parts 1, 2 and one located therebetween, the central implant portion. 3 Das mittige Implantatteil 3 ist mit den beiden endständigen Implantatteilen 1 , 2 jeweils drehbar um eine gemeinsame Achse 4 verbunden. The central implant part 3 is connected rotatably to the two terminal implant parts 1, 2 about a common axis. 4 Diese Verbindung ist bei beiden endständigen Implantatteilen unterschiedlich ausgebildet. This connection is formed differently at both terminal implant parts. Mit dem einen endständigen, in der Zeichnung jeweils unteren endständigen Implantatteil 1 ist das mittige Implantatteil 3 in einem mit der Drehachse 4 koaxialen Gewinde 5 verschraubt, so daß durch Verdrehen des mittigen Implantatteils 3 die Länge des Implantats in Richtung der Drehachse 4 veränderbar ist, und zwar zwischen zwei Zuständen, von welchen der in Fig. 1 die größte Implantatlänge, der in Fig. 2 die kleinste Implantatlänge besitzt. With the one terminal, in the drawing, the respective lower end implant part 1, the central implant part 3 is screwed in a coaxial with the rotational axis 4 of thread 5, so that the length of the implant in the direction of the axis of rotation 4 can be changed by twisting the central implant part 3, and Although between two states, of which the largest implant length in Fig. 1, which has the smallest length of the implant in Fig. 2. Diese beiden miteinander verschraubten Implantatteile 1 , 3 sind als rohrförmige Hülsen mit zumindest im Bereich des Gewindes 5 kreisförmigem Querschnitt ausgebildet. These two are screwed together implant parts 1, 3 are designed as tubular sleeves with at least circular in the region of the thread 5 cross-section. Das andere, in der Zeichnung jeweils obere endständige Implantatteil 2 dagegen hat die Form eines Stirnrings, der axial unverschiebbar, aber ebenfalls drehbar an der Hülsenwand des mittigen Implantatteils 3 gelagert ist. The other, each upper in the drawing terminal implant part 2, however, has the shape of an end ring, which is axially immovable, but also rotatably supported on the sleeve wall of the central implant part. 3 Im übrigen sind die Hülsenwände von Aussparungen 6 durchbrochen. Moreover, the sleeve walls of recesses 6 are broken.

Das mittige Implantatteil 3 übergreift das mit ihm verschraubte endständige Implantatteil 1 außenseitig in axialer Richtung, wobei das Gewinde 5 jeweils als Außengewinde auf dem endständigen Implantatteil 1 und als Innengewinde im mittleren Implantatteil 3 ausgebildet ist. The central implant part 3 engages over the screw with him terminal implant part 1 on the outside in the axial direction, the thread 5 is formed in each case as an external thread on the terminal implant part 1 and a female thread in the central implant portion. 3 Das mittlere Implantatteil 3 ist im Gewindebereich mit vier radialen Gewindebohrungen 7 versehen. The middle implant part 3 is provided in the threaded area with four radial threaded bores. 7 In einer oder mehreren dieser Gewindebohrungen 7 kann eine in der Zeichnung nicht selbst dargestellte Klemmschraube eingeschraubt und gegen das mit dem mittigen Implantatteil 3 verschraubte endständige Implantatteil 1 verspannt werden, um auf diese Weise die Gewindeverbindung 5 zwischen beiden Implantatteilen 1 , 3 gegen ungewünschtes Verdrehen zu sichern. In one or more of these threaded holes 7 a clamping screw not even shown in the drawing can be screwed in and are braced against the central implant part 3 screwed terminal implant part 1, in order to ensure in this way, the threaded connection 5 between two implant parts 1, 3 against undesired twisting ,

Die drehbare, axial unverschiebbare Verbindung zwischen dem mittigen Implantatteil 3 und dem in der Zeichnung jeweils oberen endständigen Implantatteil 2 wird einerseits von einer radial offenen Ringnut 8 gebildet, die in einer zur Drehachse 4 senkrechten Ebene verläuft und mit der Drehachse 4 koaxial ist. The rotatable, axially non-displaceable connection between the central implant part 3 and the respective upper in the drawing terminal implant part 2 on the one hand formed by a radially open annular groove 8, which extends in a direction perpendicular to the axis of rotation 4 plane and 4 coaxial with the axis of rotation. Eine andererseits vorgesehene, ebenfalls mit der Drehachse 4 koaxiale Ringleiste 9 steht in die Ringnut 8 vor, so daß gegenseitige axiale Verschiebungen beider Implantatteile 2 , 3 verhindert werden. One the other hand, provided, also coaxial with the axis of rotation 4 ring strip 9 projects into the annular groove 8, so that mutual axial displacement of the two implant parts 2, 3 can be prevented. Im einzelnen ist die Ringnut 8 radial nach außen geöffnet und an einem axial vorstehenden Ringbund 10 des mittigen Implantatteils 3 ausgebildet. More specifically, the annular groove 8 is open radially outwardly and formed the central implant part 3 at an axially projecting annular collar 10 degrees. Die entsprechend radial nach innen gerichtete Ringleiste 9 befindet sich an einem den Ringbund 10 außen umgreifenden axialen Kragen 11 des endständigen Implantatteils 2 . The respective radially inwardly directed annular strip 9 is located at one outside the annular collar 10 surrounds the collar 11 of the axial end implant part. 2 Ringbund 10 und Kragen 11 sind so aufeinander abgestimmt, daß sie die beiden Implantatteile 2 , 3 bei der gegenseitigen Verdrehung aneinander führen. Annular collar 10 and collar 11 are coordinated so that they lead the two implant parts 2, 3 in mutual twisting together. Der Ringbund 10 und die Ringleiste 9 sind an ihren beim axialen Zusammenstecken der beiden Implantatteile zunächst aneinander zur Anlage kommenden Bereichen mit einander zugeordneten Kegelflächen 12 versehen, über die beim axialen Zusammenstecken der beiden Implantatteile 2 , 3 ein Einrasten der Ringleiste 9 in die Ringnut 8 erfolgt. The annular collar 10 and the annular strip 9 are provided at their upon axial plugging together of the two implant parts are first each-engaging areas of the mutually associated cone surfaces 12 over which a latching of the ring bar 9 takes place in the annular groove 8 in the axial mating of the two implant parts 2, 3 , Die am Ringbund 10 und an der Ringleiste 9 stirnseitigen Ränder 13 der Kegelflächen 12 sind konvex gerundet. The end face on the annular collar 10 and on the annular strip 9 edges 13 of the conical surfaces 12 are convexly rounded.

Das mittige Implantatteil 3 besitzt zwischen seiner äußeren Umfangsfläche 14 und dem Ringbund 10 eine zur Drehachse 4 senkrechte ebene Ringfläche 15 , die bei zusammengesteckten Implantatteilen 2 , 3 über den Kragen 11 des endständigen Implantatteils 2 vorsteht. The central implant part 3 has, between its outer circumferential surface 14 and the annular collar 10, a plane perpendicular to the axis of rotation 4 flat annular surface 15 which protrudes in the assembled implant parts 2, 3 via the collar 11 of the terminal implant part. 2 Die axiale Höhe des mittigen Implantatteils 3 einschließlich des mit ihm axial unverschiebbar verbundenen, oberen endständigen Implantatteils 2 ist gleich der Hülsenlänge des anderen, unteren und mit dem mittigen Implantatteil 3 verschraubten Implantatteiles 1 . The axial height of the central implant part 3 including the connected to it axially non upper end implant part 2 is equal to the sleeve length of the other, bottom and screwed to the central implant part 3 implant part. 1

Die beiden endständigen Implantatteile 1 , 2 sind am jeweils vom mittigen Implantatteil 3 abgewandten Ende mit einer ringförmigen Stirnplatte 16 versehen. The two terminal implant parts 1, 2 are provided on each facing away from the central implant part 3 end with an annular end plate sixteenth Jede Stirnplatte 16 besitzt an ihrer Stirnfläche Schneiden 17 oder Spitzen zum Eindringen in den jeweils angrenzenden Wirbel. Each end plate 16 has, at its end face 17 or cutting tips to penetrate into the respective adjacent vertebrae. Im dargestellten Ausführungsbeispiel verlaufen die Schneiden 17 an jeder Stirnplatte 16 jeweils parallel zueinander. In the illustrated embodiment, the cutting edges 17 extend to each end plate 16 to each other in parallel. Es besteht aber auch die Möglichkeit, an jeder Stirnplatte 16 zwei Gruppen senkrecht zueinander verlaufender Schneiden vorzusehen, wobei jeweils zwei Schneiden in ihrem Kreuzungspunkt eine pyramidenartige Spitze bilden. But it is also possible to provide two groups 16 of perpendicular cut on each end plate, wherein two cutting edges form a pyramid-like tip in their crossing point. Die Schneiden können auch, bezogen auf die Drehachse 4 , radial verlaufen. The cutting can also relative to the axis of rotation 4, extend radially.

Die Stirnplatten 16 beider endständigen Implantatteile 1 , 2 und die äußere Umfangsfläche 14 des mittigen Implantatteils 3 besitzen den gleichen Außendurchmesser, während der Innendurchmesser der Stirnplatte 16 des axial unverschiebbar mit dem mittigen Implantatteil 3 verbundenen endständigen Implantatteils 2 gleich dem Außendurchmesser der Hülsenwand des mit dem mittigen Implantatteil 3 verschrauben endständigen Implantatteils 1 ist. The end plates 16 of the two terminal implant parts 1, 2 and the outer peripheral surface 14 of the central implant part 3 have the same outer diameter as the inner diameter of the end plate 16 of the axially immovably connected to the central implant part 3 end implant part 2 is equal to the outer diameter of the sleeve wall of the central with the implant part 3 screwed end implant part 1. Zwischen der Stirnplatte 16 und der Hülsenwand des mit dem mittigen Implantatteils 3 verschraubten endständigen Implantatteils 1 ist eine über den Umfang verlaufende Hohlkehle 18 ausgebildet. Between the end plate 16 and the wall of the sleeve is screwed to the central implant part 3 end implant part 1 a extending through the peripheral groove 18 is formed.

Die Aussparungen 6 in den beiden hülsenförmigen Implantatteilen 1 , 3 sind als kreisrunde Bohrungen ausgebildet und gleichmäßig über den Hülsenumfang verteilt. The recesses 6 in the two sleeve-shaped implant parts 1, 3 are formed as circular bores and uniformly distributed over the sleeve circumference. Die Aussparungen 6 im mittigen Implantatteil 3 können als Schlüsselöffnungen zum Einstecken eines zum Verdrehen des mittigen Implantatteils geeigneten Schlüssels verwendet werden. The recesses 6 in the central implant part 3 can be used as key openings for the insertion of a suitable for twisting the central implant part key. Im übrigen sind im Ausführungsbeispiel die Aussparungen 6 im mittigen Implantatteil 3 im lichten Durchmesser etwas größer als im endständigen Implantatteil 1 . Incidentally, the recesses 6 in the central implant part 3 in inside diameter slightly larger than the terminal implant part 1 in the embodiment. Im übrigen sind die Aussparungen 6 im mittigen Implantatteil 3 im lichten Durchmesser auch größer als die Gewindebohrungen 7 , so daß der Schlüssel zum Verdrehen des Implantatteils 3 nicht versehentlich in eine der Gewindebohrungen 7 eingesteckt werden und dort das Gewinde beschädigen kann. Incidentally, the recesses 6 in the central implant part 3 in inner diameter and larger than the threaded holes 7, so that the key to rotate the implant portion 3 can not be accidentally inserted into one of the threaded holes 7 and there can damage the threads.

Claims (17)

  1. 1. Implantat zum Einsetzen zwischen Wirbelkörper der Wirbelsäule als Platzhalter, bestehend aus zwei endständigen, zur Anlage an den angrenzenden Wirbeln bestimmten Implantatteilen ( 1 , 2 ) und einem dazwischen befindlichen, mittigen Implantatteil ( 3 ), das mit den endständigen Implantatteilen ( 1 , 2 ) jeweils drehbar um eine gemeinsame Achse ( 4 ) verbunden ist, wobei das mittige Implantatteil ( 3 ) mit einem der endständigen Implantatteile ( 1 ) in einem mit der Drehachse ( 4 ) koaxialen Gewinde ( 5 ) verschraubt ist, so daß durch Verdrehen des mittigen Implantatteils ( 3 ) die Länge des Implantats in Richtung der Drehachse ( 4 ) veränderbar ist, dadurch gekennzeichnet, daß die beiden miteinander verschraubten Implantatteile ( 1 , 3 ) als rohrförmige Hülsen mit zumindest im Bereich des Gewindes ( 5 ) kreisförmigem Querschnitt und das andere endständige Implantatteil ( 2 ) als Stirnring ausgebildet sind, der axial unverschiebbar und drehbar an der Hülsenwand des mitti 1. An implant for insertion between vertebral bodies of the spinal column as a place holder, consisting of two terminal, for bearing against the adjacent vertebrae particular implant parts (1, 2) and located one in between, the central implant portion (3) (1 with the terminal implant parts, 2 ) rotatable (about a common axis in each case 4) is connected, wherein the central implant portion (3) is screwed to one of the terminal implant portions (1) in a (with the rotation axis 4) coaxial thread (5), so that the central by rotating implant part (3) the length of the implant in the direction of the axis of rotation (4) is variable, characterized in that the two screwed-together parts of the implant (1, 3) of circular as tubular sleeves having at least in the region of the thread (5) cross section and the other terminal implant portion (2) are formed as end ring, the axially non-displaceably and rotatably on the sleeve wall of the mitti gen Implantatteils ( 3 ) gelagert ist, und daß die Hülsenwände von Aussparungen ( 6 ) durchbrochen sind. is mounted gen implant portion (3), and that the sleeve walls of recesses (6) are broken.
  2. 2. Implantat nach Anspruch 1, dadurch gekennzeichnet, daß das mittige Implantatteil ( 3 ) das mit ihm verschraubte endständige Implantatteil ( 1 ) außenseitig axial übergreift, wobei das Gewinde ( 5 ) jeweils als Außengewinde auf dem endständigen Implantatteil ( 1 ) und als Innengewinde im mittigen Implantatteil ( 3 ) ausgebildet ist. 2. The implant according to claim 1, characterized in that the central implant part (3) engages over the screw with him terminal implant part (1) axially on the outside, wherein the thread (5) each as a male thread on the terminal implant portion (1) and as an internal thread in formed central implant portion (3).
  3. 3. Implantat nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das mittige Implantatteil ( 3 ) im Gewindebereich ( 5 ) mindestens eine radiale Gewindebohrung ( 7 ) aufweist, in der eine gegen das mit ihm verschraubte endständige Implantatteil ( 1 ) verspannbare Klemmschraube geführt ist. 3. The implant according to claim 1 or 2, characterized in that the central implant portion (3) in the threaded region (5) has at least one radial threaded bore (7), in the braced one against the screw with him terminal implant part (1) the clamping screw is guided ,
  4. 4. Implantat nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die drehbare, axial unverschiebbare Verbindung zwischen den Implantatteilen ( 2 , 3 ) von einer in einer zur Drehachse ( 4 ) senkrecht stehenden Ebene verlaufenden, koaxialen, radial offenen Ringnut ( 8 ) am einen Implantatteil ( 3 ) und aus einer in die Ringnut ( 8 ) vorstehenden, koaxialen Ringleiste ( 9 ) am anderen Implantatteil ( 2 ) gebildet ist. 4. The implant according to one of claims 1 to 3, characterized in that the rotatable, axially non-displaceable connection between the implant parts (2, 3) extending from a plane perpendicular to a axis of rotation (4) level, coaxial, radially open annular groove (8 ) is formed at an implant portion (3) and from one (in the annular groove 8) above, coaxial annular strip (9) at the other implant part (2).
  5. 5. Implantat nach Anspruch 4, dadurch gekennzeichnet, daß die radial nach außen offene Ringnut ( 8 ) an einem axial vorstehenden Ringbund ( 10 ) des mittigen Implantatteils ( 3 ) und die radial nach innen gerichtete Ringleiste ( 9 ) an einem den Ringbund ( 10 ) außen umgreifenden, axialen Kragen ( 11 ) des endständigen Implantatteils ( 2 ) ausgebildet ist, wobei der Ringbund ( 10 ) und die Ringleiste ( 9 ) mit einander zugeordneten Kegelflächen ( 12 ) versehen sind, über die beim axialen Zusammenstecken der beiden Implantatteile ( 2 , 3 ) ein Einrasten der Ringleiste ( 9 ) in die Ringnut ( 8 ) möglich ist. 5. The implant according to claim 4, characterized in that the radially outwardly open annular groove (8) at an axially projecting annular collar (10) of the central implant part (3) and the radially inwardly directed annular ledge (9) on one (the annular collar 10 ) is formed externally engages around the axial collar (11) of the terminal implant part (2), wherein the annular collar (10) and the ring rail (9) with mutually associated tapered surfaces (12) are provided, via which during the axial mating of the two implant parts (2 , 3) engaging the annular ledge (9) into the annular groove (8) is possible.
  6. 6. Implantat nach Anspruch 5, dadurch gekennzeichnet, daß die am Ringbund ( 10 ) und an der Ringleiste ( 9 ) stirnseitigen Ränder ( 13 ) der Kegelflächen ( 12 ) konvex gerundet sind. 6. The implant according to claim 5, characterized in that the annular collar (10) and on the annular strip (9) end-face edges (13) of the conical surfaces (12) are convexly rounded.
  7. 7. Implantat nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß das mittige Implantatteil ( 3 ) zwischen seiner äußeren Umfangsfläche ( 14 ) und dem Ringbund ( 10 ) eine zur Drehachse ( 4 ) senkrechte Ringfläche ( 15 ) besitzt, die radial auswärts über den Kragen ( 11 ) des endständigen Implantatteils ( 2 ) vorsteht. 7. The implant according to claim 5 or 6, characterized in that the central implant part (3) to the rotation axis (4) perpendicular annular surface (15) between its outer circumferential surface (14) and the annular collar (10) projecting radially outwardly beyond the collar (11) of the terminal implant part (2) protrudes.
  8. 8. Implantat nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die axiale Höhe des mittigen Implantatteils ( 3 ) einschließlich des mit ihm axial unverschiebbar verbundenen endständigen Implantatteils ( 2 ) gleich ist der Hülsenlänge des anderen, mit dem mittigen Implantatteil ( 3 ) durch das Gewinde ( 5 ) verschraubten Implantatteils ( 1 ). 8. The implant according to one of claims 1 to 7, characterized in that the axial height of the central implant portion (3) including the axially non-connected thereto terminal implant part (2) is equal to the sleeve length of the other, with the central implant part (3) by the thread (5) screwed implant part (1).
  9. 9. Implantat nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die beiden endständigen Implantatteile ( 1 , 2 ) am jeweils vom mittigen Implantatteil ( 3 ) abgewandten Ende mit einer ringförmigen Stirnplatte ( 16 ) und diese Stirnplatten ( 16 ) an ihrer Stirnfläche mit zum Eindringen in den angrenzenden Wirbel bestimmten Schneiden ( 17 ) oder Spitzen versehen sind. 9. The implant according to one of claims 1 to 8, characterized in that the two terminal implant parts (1, 2) end facing away from the from the central implant part respectively (3) with an annular end plate (16) and said end plates (16) at its end face with specific to penetrate the adjacent vertebral cutting edges (17) or spikes are provided.
  10. 10. Implantat nach Anspruch 9, dadurch gekennzeichnet, daß die Schneiden ( 17 ) an jeder Stirnplatte ( 16 ) jeweils parallel zueinander verlaufen. 10. The implant according to claim 9, characterized in that the cutting edges (17) run to each other at each end plate (16) in parallel.
  11. 11. Implantat nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß zwei Gruppen senkrecht zueinander verlaufender Schneiden ( 17 ) vorgesehen sind, die im Kreuzungspunkt von jeweils zwei Schneiden pyramidenartige Spitzen bilden. 11. The implant according to claim 9 or 10, characterized in that two groups of perpendicular blades (17) are provided which form at the intersection of two cutting pyramidal tips.
  12. 12. Implantat nach Anspruch 9, dadurch gekennzeichnet, daß die Schneiden ( 17 ) radial verlaufen. 12. The implant according to claim 9, characterized in that the cutting edges (17) extend radially.
  13. 13. Implantat nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, daß die Stirnplatten ( 16 ) beider endständigen Implantatteile ( 1 , 2 ) und die äußere Umfangsfläche ( 14 ) des mittigen Implantatteils ( 3 ) den gleichen Außendurchmesser besitzen. 13. The implant according to one of claims 9 to 12, characterized in that the end plates (16) of both terminal implant parts (1, 2) and the outer circumferential surface (14) of the central implant part (3) have the same outer diameter.
  14. 14. Implantat nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, daß der Innendurchmesser der Stirnplatte ( 16 ) des axial unverschiebbar mit dem mittigen Implantatteil ( 3 ) verbundenen endständigen Implantatteils ( 2 ) gleich dem Außendurchmesser der Hülsenwand des mit dem mittigen Implantatteil ( 3 ) verschraubten endständigen Implantatteils ( 1 ) ist. 14. The implant according to one of claims 9 to 13, characterized in that the inner diameter of the end plate (16) of the axially non-displaceably with the central implant portion (3) connected to the terminal implant part (2) is equal to the outer diameter of the sleeve wall of the (with the central implant part 3 is) screwed end implant part (1).
  15. 15. Implantat nach einem der Ansprüche 8 bis 14, dadurch gekennzeichnet, daß zwischen der Stirnplatte ( 16 ) und der Hülsenwand des mit dem mittigen Implantatteil ( 3 ) verschraubten endständigen Implantatteils ( 1 ) eine über den Umfang verlaufende Hohlkehle ( 18 ) ausgebildet ist. 15. The implant according to one of claims 8 to 14, characterized in that bolted between the end plate (16) and the sleeve wall of the central implant portion (3) end implant part (1) there is formed an extending over the circumference groove (18).
  16. 16. Implantat nach einem der Ansprüche 1 bis 15, dadurch gekennzeichnet, daß die Aussparungen ( 6 ) gleichmäßig über den Hülsenumfang verteilt und als Schlüsselöffnungen zum Einstecken eines zum Verdrehen des mittigen Implantatteils dienenden Schlüssels ausgebildet sind. 16. Implant according to one of claims 1 to 15, characterized in that the recesses (6) uniformly distributed over the sleeve circumference and are formed as key openings for insertion of a serving to rotate the central implant part key.
  17. 17. Implantat nach einem der Ansprüche 1 bis 16, dadurch gekennzeichnet, daß die Aussparungen ( 6 ) im mittigen Implantatteil ( 3 ) im lichten Querschnitt größer als im endständigen Implantatteil ( 1 ) sind. 17. Implant according to one of claims 1 to 16, characterized in that the recesses (6) are in the central implant portion (3) in the internal cross-section larger than in the terminal implant part (1).
DE1995109317 1995-03-15 1995-03-15 Implant for insertion between vertebral bodies of the spinal column as a place holder Expired - Lifetime DE19509317B4 (en)

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