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

Spinal column implant for mounting between vertebrae

Info

Publication number
DE19509317A1
DE19509317A1 DE19509317A DE19509317A DE19509317A1 DE 19509317 A1 DE19509317 A1 DE 19509317A1 DE 19509317 A DE19509317 A DE 19509317A DE 19509317 A DE19509317 A DE 19509317A DE 19509317 A1 DE19509317 A1 DE 19509317A1
Authority
DE
Germany
Prior art keywords
implant
implant part
central
terminal
ring
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
DE19509317A
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 and Co KG
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19509317A priority Critical patent/DE19509317B4/en
Publication of DE19509317A1 publication Critical patent/DE19509317A1/en
Application granted granted Critical
Publication of DE19509317B4 publication Critical patent/DE19509317B4/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special 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
    • A61F2/4611—Special 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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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30362—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit with possibility of relative movement between the protrusion and the recess
    • A61F2002/30364—Rotation about the common longitudinal axis
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30405—Connections 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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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
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    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30507—Connections 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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    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
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    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30904—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves serrated profile, i.e. saw-toothed
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0006—Rounded shapes, e.g. with rounded corners circular
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0065—Three-dimensional shapes toroidal, e.g. ring-shaped, doughnut-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0069—Three-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 the vertebral body of the spine as a placeholder consisting of two terminal, for attachment to the adjacent vertebrae certain implant parts and one intermediate implant part located with the the terminal implant parts can each be rotated by one common axis is connected, the middle Implant part with one of the terminal implant parts in is screwed onto a thread coaxial with the axis of rotation, so that by turning the central implant part The length of the implant can be changed in the direction of the axis of rotation is.  

Implantate dieser Art sind aus US-PS 4 657 550 bekannt und dienen als Platzhalter für aus der Wirbelsäule entfernte Wirbel oder Wirbelteile. Die Implantate ermöglichen durch Verdrehen des mittigen Implantatteils eine Distraktion des das Implantat enthaltenden Wirbelsäulenbereichs. 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. 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. Das mittige Implantatteil ist mit Gewindebohrungen für die Aufnahme der Gewindebolzen ausgebildet. Dieses bekannte Implantat hat den Nachteil, daß nach dem Einsetzen des Implantats die Knochenbildung und -regeneration zu wünschen übrig läßt. 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.Implants of this type are known from US Pat. No. 4,657,550 and serve as placeholders for those removed from the spine Vertebrae or vertebral parts. The implants allow through Twisting the central part of the implant distracts the the spinal area containing the implant. Here are both terminal implant parts with the middle Screwed implant part by a thread, the two threads in the longitudinal direction of the spine coaxial are arranged and mutually opposite thread sense have. The two terminal implant parts are each formed in two parts and each consist of one on the adjacent vertebra coming to rest, to the vertebra thorny printing plate and a Threaded bolt that is torsion-proof with a polygonal head around the pin axis in a corresponding receptacle in the Pressure plate is inserted. The central implant part is with threaded holes for receiving the threaded bolts educated. This known implant has the disadvantage that after inserting the implant, bone formation and regeneration leaves something to be desired. In addition, at the total axial length of such an implant at least as long as the total length of the two opposing ones Thread, which is a limitation regarding smallest possible shortest implant length means that these known implants are not considered Intervertebral space holder suitable for intervertebral disc replacement are.

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. Das Implantat ist aus einem mit den Ausnehmungen versehenen Blech ein- oder zweilagig gewickelt. 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. Nachteilig bei einem solchen Implantat ist, daß es in der Länge nicht verstellbar ist und keinerlei Distraktion der benachbarten Wirbel ermöglicht.EP 0 368 115 B1 describes a placeholder for one Vertebral implant described as jacket-shaped element with recesses in the wall is formed, the upper and lower edge of the jacket are at least partially jagged to  a non-rotatable connection between those to be connected Surrender. The implant is made with one Single-layer or double-layer sheet metal wrapped. Through the recesses can if desired a material to be introduced into the jacket interior, such as Bone cement or pieces of bone to be inserted, resulting in a faster vascular connection with the implant is achieved. The disadvantage of such an implant is that it is not adjustable in length and none at all Allows 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 invention has for its object an implant of the type mentioned in such a way that it is on a Minimum length is adjustable, which is its use as Intervertebral space placeholder for intervertebral disc replacement allows, and that it for the induction of Bone formation and stimulation of the bones are particularly good is suitable and therefore especially after implantation can wax easily and quickly.

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 in an implant solved with the features mentioned in that the two implant parts screwed together as tubular sleeves with at least in the area of the thread circular cross section and the other terminal Implant part are designed as a front ring, the axial immovable and rotatable on the sleeve wall of the middle Implant part is stored, and that the sleeve walls of Cutouts 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. Dies zusammen mit der Möglichkeit, den Hohlraum mit Knochenzement oder patienteneigenen oder fremden Knochenspänen zu füllen, läßt das Implantat schnell und zuverlässig einwachsen. Dennoch bleibt die Distraktionsmöglichkeit des Implantats während der Operation voll erhalten. 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.The inventive design of the implant from two Sleeves and a front ring leave one inside the implant continuous cavity arise through the in the  Recesses located through the sleeve walls with is accessible from the outside of the implant. This together with the option of using bone cement or the cavity fill patient's own or foreign bone chips, allows the implant to grow in quickly and reliably. However, the implant can still be distracted fully preserved during the operation. Because the implant only has a single thread is the possible one Minimum length to shorten the implant can be screwed together by the thread length only this one thread determines, because both sleeve-shaped Implant parts can practically completely interlock screwed and the other end part of the implant Forming front ring can be made very low axially overall, which results in a very low design, the use of the implant for intervertebral disc replacement enables.

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. Diese Anordnung hat zur Folge, daß das Außengewinde des endständigen Implantatteils nach außen hin durch die Hülsenwand des mittigen Implantatteils abgedeckt ist. 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.A preferred embodiment of the invention Implant is characterized in that the middle Implant part the terminal screwed to it Axially overlaps the implant part on the outside, the Threads each as an external thread on the terminal Implant part and as an internal thread in the middle Implant part is formed. This arrangement has Consequence that the external thread of the terminal Implant part outwards through the sleeve wall of the central implant part is covered. To be implanted in Condition the implant parts against twisting to secure, the middle implant part in Thread area of the terminal implant part at least have a radial threaded bore in which one against the terminal implant part screwed to it  braced clamping screw is guided in the braced Condition of both implant parts fixed against each other.

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. 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. 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. 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. Das Implantat kann dann durch Ineinanderschrauben beider hülsenförmigen Implantatteile im wesentlichen bis auf die Hülsenlänge des endständigen Implantatteils verkürzt werden. The axially immovable, but also rotatable Connection between the central implant part and the second terminal implant part is preferably from in a plane perpendicular to the axis of rotation running, coaxial, radially open ring groove on one Implant part and from a protruding into the ring groove coaxial ring bar formed on the other implant part. The arrangement is expediently so hit that the radially outwardly open annular groove an axially projecting collar of the middle Implant part and the radially inward Ring bar on a ring around the outside, axial collar of the terminal implant part is formed is, with the ring collar and the ring bar with each other assigned conical surfaces are provided over which at axially plug the two implant parts together It is possible to snap the ring bar into the ring groove. Around putting the two implant parts together and her To make it easier to snap into place during assembly are the on the ring collar and on the ring bar at the front edges of the Conical surfaces expediently rounded convex. Furthermore is the axial height of the central implant part including the one with it axially immovable connected terminal implant part preferably equal to the sleeve length of the other, with the middle Screwed implant part. The implant can then by screwing the two sleeve-shaped Implant parts essentially up to the sleeve length of the terminal implant part can be shortened.  

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. Dadurch können die endständigen Implantatteile an den angrenzenden Wirbeln gegen ungewünschte Verlagerungen gesichert werden. Im einzelnen können die Schneiden an jeder Stirnplatte jeweils parallel zueinander verlaufen. 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. Die Schneiden können auch radial verlaufen.A further preferred embodiment is thereby characterized in that the two terminal implant parts at the end facing away from the central implant part an annular end plate and these end plates their end face to penetrate into the adjacent Vertebrae are provided with certain cutting edges or tips. This allows the terminal implant parts to be attached to the adjacent vertebrae against unwanted displacement be secured. In detail, the cutting edges can each end plate run parallel to each other. There is also the particularly advantageous possibility of two groups per face plate perpendicular to each other running edges to be provided at the intersection form pyramid-like tips of two cutting edges each. The cutting edges can also run radially.

Nach einem weiteren Vorschlag der Erfindung besitzen die Stirnplatten beider endständigen Implantatteile und die äußere Umfangsfläche des mittigen Implantatteils den gleichen Außendurchmesser. 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. 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. According to a further proposal of the invention, the End plates of both terminal implant parts and the outer peripheral surface of the central implant part same outside diameter. It is also recommended that Make the arrangement so that the inside diameter of the Faceplate of the axially immovable with the middle Terminal part connected to the implant part equal to the outside diameter of the one with the middle Screwed implant part terminal implant part is. For the rest, it is recommended that between the Face plate and the sleeve wall of the with the middle Screwed implant part terminal implant part a circumferential groove is formed is.  

Bezüglich der Ausbildung und Anordnung der Aussparungen in den Hülsenwänden der miteinander verschraubten Implantatteile besteht im Rahmen der Erfindung eine gewisse Wahlfreiheit. 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. Im allgemeinen wird man dabei die Aussparungen als im Querschnitt kreisförmige Bohrungen oder als Langlöcher ausbilden. 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. Die Aussparungen im mittigen Implantatteil können im lichten Querschnitt größer als im mit ihm verschraubten endständigen Implantatteil sein.Regarding the formation and arrangement of the recesses in the sleeve walls of the screwed together Implant parts exist within the scope of the invention certain freedom of choice. On the one hand, that of Cutouts represented overall clear cross-section be as large as possible, on the other hand, the recesses are allowed do not unduly weaken the thread areas so that the Strength of the threaded connection between the Implant parts do not experience any impairment. in the in general you will see the recesses as in Cross-section of circular holes or as elongated holes form. The recesses are expedient evenly distributed over the sleeve circumference and in the middle Implant part as key openings for inserting one for rotating the central implant part Key trained. The cutouts in the middle The implant part can have a larger cross section than in terminal implant part screwed to it.

Im folgenden wird die Erfindung an einem in der Zeichnung dargestellten Ausführungsbeispiel näher erläutert; es zeigen:In the following the invention on one in the drawing illustrated embodiment explained in more detail; it demonstrate:

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 in Fig. 12 with XIII designated 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. Das Implantat besteht aus zwei endständigen, zur Anlage an den angrenzenden Wirbeln bestimmten Implantatteilen 1, 2 und einem dazwischen befindlichen, mittigen Implantatteil 3. Das mittige Implantatteil 3 ist mit den beiden endständigen Implantatteilen 1, 2 jeweils drehbar um eine gemeinsame Achse 4 verbunden. Diese Verbindung ist bei beiden endständigen Implantatteilen unterschiedlich ausgebildet. 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. Diese beiden miteinander verschraubten Implantatteile 1, 3 sind als rohrförmige Hülsen mit zumindest im Bereich des Gewindes 5 kreisförmigem Querschnitt ausgebildet. 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. Im übrigen sind die Hülsenwände von Aussparungen 6 durchbrochen.The implant shown in FIGS. 1 and 2 is used as a placeholder for intervertebral disc replacement between vertebrae not shown in the drawing itself. The implant consists of two terminal implant parts 1 , 2 intended for contact with the adjacent vertebrae and a central implant part 3 located between them. The central implant part 3 is connected to the two terminal implant parts 1 , 2 in each case rotatably about a common axis 4 . This connection is designed differently for the two terminal implant parts. With one terminal, in the drawing the bottom terminal implant part 1 , the central implant part 3 is screwed into a thread 5 coaxial with the axis of rotation 4 , so that the length of the implant can be changed in the direction of the axis of rotation 4 by rotating 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. These two implant parts 1 , 3 screwed together are designed as tubular sleeves with a circular cross section at least in the area of the thread 5 . The other, in the drawing in each case upper, terminal implant part 2, on the other hand, has the shape of a front ring which is axially immovable but also rotatably mounted on the sleeve wall of the central implant part 3 . In addition, the sleeve walls are broken through by recesses 6 .

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. Das mittlere Implantatteil 3 ist im Gewindebereich mit vier radialen Gewindebohrungen 7 versehen. 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.The central implant part 3 overlaps the terminal implant part 1 screwed to it on the outside in the axial direction, the thread 5 being designed as an external thread on the terminal implant part 1 and as an internal thread in the central implant part 3 . The middle implant part 3 is provided with four radial threaded bores 7 in the threaded area. A clamping screw (not shown in the drawing) can be screwed into one or more of these threaded bores 7 and clamped against the terminal implant part 1 screwed to the central implant part 3 , in order to secure the threaded connection 5 between the two implant parts 1 , 3 against undesired rotation .

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. 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. Im einzelnen ist die Ringnut 8 radial nach außen geöffnet und an einem axial vorstehenden Ringbund 10 des mittigen Implantatteils 3 ausgebildet. Die entsprechend radial nach innen gerichtete Ringleiste 9 befindet sich an einem den Ringbund 10 außen umgreifenden axialen Kragen 11 des endständigen Implantatteils 2. Ringbund 10 und Kragen 11 sind so aufeinander abgestimmt, daß sie die beiden Implantatteile 2, 3 bei der gegenseitigen Verdrehung aneinander führen. 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. Die am Ringbund 10 und an der Ringleiste 9 stirnseitigen Ränder 13 der Kegelflächen 12 sind konvex gerundet.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 is coaxial with the axis of rotation. 4 A ring bar 9, which is provided on the other hand and is also coaxial with the axis of rotation 4, projects into the annular groove 8 , so that mutual axial displacements of the two implant parts 2 , 3 are prevented. Specifically, the annular groove 8 is opened radially outwards and is formed on an axially projecting annular collar 10 of the central implant part 3 . The corresponding radially inwardly directed ring strip 9 is located on an axial collar 11 of the terminal implant part 2 which surrounds the ring collar 10 on the outside. Annular collar 10 and collar 11 are matched to one another in such a way that they guide the two implant parts 2 , 3 to one another during the mutual rotation. The ring collar 10 and the ring strip 9 are provided on their areas which come into contact with one another when the two implant parts are axially plugged together with associated conical surfaces 12 , via which the ring strip 9 snaps into the ring groove 8 when the two implant parts 2 , 3 are plugged together axially . The front edges 13 of the conical surfaces 12 on the collar 10 and on the ring strip 9 are rounded convexly.

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. 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 central implant part 3 has between its outer circumferential surface 14 and the annular collar 10 a flat annular surface 15 perpendicular to the axis of rotation 4 , which protrudes beyond the collar 11 of the terminal implant part 2 when the implant parts 2 , 3 are plugged together. The axial height of the central implant part 3, including the upper terminal implant part 2 axially immovably connected to it, is equal to the sleeve length of the other, lower implant part 1 screwed to the central implant part 3 .

Die beiden endständigen Implantatteile 1, 2 sind am jeweils vom mittigen Implantatteil 3 abgewandten Ende mit einer ringförmigen Stirnplatte 16 versehen. Jede Stirnplatte 16 besitzt an ihrer Stirnfläche Schneiden 17 oder Spitzen zum Eindringen in den jeweils angrenzenden Wirbel. Im dargestellten Ausführungsbeispiel verlaufen die Schneiden 17 an jeder Stirnplatte 16 jeweils parallel zueinander. 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. Die Schneiden können auch, bezogen auf die Drehachse 4, radial verlaufen.The two terminal implant parts 1 , 2 are provided with an annular end plate 16 at the end facing away from the central implant part 3 . Each end plate 16 has cutters 17 or tips on its end face for penetration into the respectively adjacent vertebra. In the illustrated embodiment, the cutting edges 17 run parallel to each other on each end plate 16 . However, there is also the possibility of providing two groups of cutting edges running perpendicular to one another on each end plate 16, two cutting edges each forming a pyramid-like tip at their crossing point. The cutting edges can also run radially with respect to the axis of rotation 4 .

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. 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.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, while the inner diameter of the end plate 16 of the terminal implant part 2 axially immovably connected to the central implant part 3 is equal to the outer diameter of the sleeve wall of the central part Screw the implant part 3 into the terminal implant part 1 . Between the end plate 16 and the sleeve wall of the terminal implant part 1 screwed to the central implant part 3 , a groove 18 is formed which extends over the circumference.

Die Aussparungen 6 in den beiden hülsenförmigen Implantatteilen 1, 3 sind als kreisrunde Bohrungen ausgebildet und gleichmäßig über den Hülsenumfang verteilt. Die Aussparungen 6 im mittigen Implantatteil 3 können als Schlüsselöffnungen zum Einstecken eines zum Verdrehen des mittigen Implantatteils geeigneten Schlüssels verwendet werden. Im übrigen sind im Ausführungsbeispiel die Aussparungen 6 im mittigen Implantatteil 3 im lichten Durchmesser etwas größer als im endständigen Implantatteil 1. 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.The recesses 6 in the two sleeve-shaped implant parts 1 , 3 are designed as circular bores and are evenly distributed over the sleeve circumference. The recesses 6 in the central implant part 3 can be used as key openings for inserting a key suitable for rotating the central implant part. Otherwise, in the exemplary embodiment, the cutouts 6 in the central implant part 3 are slightly larger in diameter than in the terminal implant part 1 . In addition, the recesses 6 in the central implant part 3 are also larger in diameter than the threaded holes 7 , so that the key for rotating the implant part 3 cannot be accidentally inserted into one of the threaded holes 7 and damage the thread there.

Claims (17)

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 mittigen Implantatteils (3) gelagert ist, und daß die Hülsenwände von Aussparungen (6) durchbrochen sind.1.Implant for insertion between the vertebral body of the spine as a placeholder, consisting of two terminal implant parts ( 1 , 2 ) intended for contact with the adjacent vertebrae and a central implant part ( 3 ) located between them, which is connected to the terminal implant parts ( 1 , 2 ) is rotatably connected about a common axis ( 4 ), the central implant part ( 3 ) being screwed to one of the terminal implant parts ( 1 ) in a thread ( 5 ) coaxial with the axis of rotation ( 4 ), so that by turning the central one Implant part ( 3 ) the length of the implant can be changed in the direction of the axis of rotation ( 4 ), characterized in that the two implant parts ( 1 , 3 ) screwed together are tubular sleeves with a circular cross-section at least in the area of the thread ( 5 ) and the other terminal Implant part ( 2 ) are designed as a front ring, which is axially immovable and rotatable on the sleeve wall of the mitti gene implant part ( 3 ) is mounted, and that the sleeve walls of openings ( 6 ) are broken. 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. Implant according to claim 1, characterized in that the central implant part ( 3 ) axially overlaps the terminal implant part ( 1 ) screwed to it on the outside, the thread ( 5 ) in each case as an external thread on the terminal implant part ( 1 ) and as an internal thread in central implant part ( 3 ) is formed. 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. Implant according to claim 1 or 2, characterized in that the central implant part ( 3 ) in the threaded region ( 5 ) has at least one radial threaded bore ( 7 ) in which a clamping screw is clamped against the screwed terminal implant part ( 1 ) . 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. Implant according to one of claims 1 to 3, characterized in that the rotatable, axially immovable connection between the implant parts ( 2 , 3 ) from a in a plane perpendicular to the axis of rotation ( 4 ) extending, coaxial, radially open annular groove ( 8th ) is formed on one implant part ( 3 ) and from a coaxial ring strip ( 9 ) protruding into the annular groove ( 8 ) on the other implant part ( 2 ). 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. Implant according to claim 4, characterized in that the radially outwardly open annular groove ( 8 ) on an axially projecting collar ( 10 ) of the central implant part ( 3 ) and the radially inwardly directed ring strip ( 9 ) on one of the collar ( 10 ) is formed around the outer, axial collar ( 11 ) of the terminal implant part ( 2 ), the annular collar ( 10 ) and the ring strip ( 9 ) being provided with conical surfaces ( 12 ) which are assigned to one another and via which the two implant parts ( 2 , 3 ) it is possible to snap the ring bar ( 9 ) into the ring groove ( 8 ). 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. Implant according to claim 5, characterized in that on the annular collar ( 10 ) and on the ring ledge ( 9 ) end edges ( 13 ) of the conical surfaces ( 12 ) are convexly rounded. 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. Implant according to claim 5 or 6, characterized in that the central implant part ( 3 ) between its outer circumferential surface ( 14 ) and the annular collar ( 10 ) has a perpendicular to the axis of rotation ( 4 ) annular surface ( 15 ) which radially outwards over the Collar ( 11 ) of the terminal implant part ( 2 ) protrudes. 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. Implant according to one of claims 1 to 7, characterized in that the axial height of the central implant part ( 3 ) including the terminal implant part ( 2 ) axially immovably connected to it is equal to the sleeve length of the other, with the central implant part ( 3 ) through the thread ( 5 ) screwed implant part ( 1 ). 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. Implant according to one of claims 1 to 8, characterized in that the two terminal implant parts ( 1 , 2 ) at the end facing away from the central implant part ( 3 ) in each case with an annular end plate ( 16 ) and these end plates ( 16 ) on their end face are provided with blades ( 17 ) or tips intended for penetration into the adjacent vertebrae. 10. Implantat nach Anspruch 9, dadurch gekennzeichnet, daß die Schneiden (17) an jeder Stirnplatte (16) jeweils parallel zueinander verlaufen. 10. Implant according to claim 9, characterized in that the cutting edges ( 17 ) on each end plate ( 16 ) each run parallel to one another. 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. Implant according to claim 9 or 10, characterized in that two groups of cutting edges ( 17 ) running perpendicular to one another are provided which form pyramid-like tips at the intersection of two cutting edges. 12. Implantat nach Anspruch 9, dadurch gekennzeichnet, daß die Schneiden (17) radial verlaufen.12. Implant according to claim 9, characterized in that the cutting edges ( 17 ) run radially. 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. 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 peripheral surface ( 14 ) of the central implant part ( 3 ) have the same outer diameter. 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. Implant according to one of claims 9 to 13, characterized in that the inner diameter of the end plate ( 16 ) of the axially immovably connected to the central implant part ( 3 ) terminal implant part ( 2 ) is equal to the outer diameter of the sleeve wall of the central implant part ( 3rd ) screwed terminal implant part ( 1 ). 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. Implant according to one of claims 8 to 14, characterized in that a circumferential groove ( 18 ) is formed between the end plate ( 16 ) and the sleeve wall of the terminal implant part ( 1 ) screwed to the central implant part ( 3 ). 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 ) are distributed uniformly over the circumference of the sleeve and are designed as key openings for inserting a key serving to rotate the central implant part. 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 ) in the central implant part ( 3 ) are larger in the clear cross section than in the terminal implant part ( 1 ).
DE19509317A 1995-03-15 1995-03-15 Implant for insertion between vertebral bodies of the spine as a placeholder Expired - Lifetime DE19509317B4 (en)

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