Spondylodese-StabilisatorSpinal fusion stabilizer
Die Erfindung betrifft einen Spondylodese-Stabilisator für die Fixierungder relativen Lage zweier unmittelbar benachbarter Wirbel zueinander.The invention relates to a spinal fusion stabilizer for fixationthe relative position of two immediately adjacent vertebrae to each other.
Bei den bisherigen Konstruktionen von Spondylodese-Stabilisatorensind zwei grundsätzlich verschiedene Bauarten zu unterscheiden. Bei dem einen Konstruktionskonzeptbenutzt man sogenannte Harrington-Stäbe; das sind gerillte Stäbe, die an je einemgesunden Wirbel oberhalb und unterhalb der zu stabilisierenden Wirbel mit Hilfevon Haken am Wirbelbogen eingedie hangt wadin,um/dazwischen liegenden Wirbel zudistrahieren.In the previous designs of spinal fusion stabilizersa distinction must be made between two fundamentally different types. With one construction conceptso-called Harrington sticks are used; these are grooved bars, each attached to onehealthy vertebrae above and below the vertebrae to be stabilized with the helpby hooks on the vertebral arch which hangs wadin to / between vertebraedistract.
Für eine Kompression einer Anzahl Wirbel werden bei diesem KonzeptGewinde-/stangen in Verbindung mit den erwähnten Haken verwendet.With this concept, a number of vertebrae are compressedThreaded rods used in conjunction with the hooks mentioned.
Mindestens einer dieser Haken ist dabei mit einer Gewindemutter verbunden(Hackenbroch und Witt: Orthopädischchirurgischer Operationsatlas, Band III, Seite65 und 127, Stuttgart, 1974). Ebenso wie andere Konstruktionen, bei denen über dieHöhe mehrerer Wirbel wirkende Federn benutzt werden, ist es mit diesen Stäben nichtmöglich, unmittelbar benachbarte Wirbel direkt gegeneinander zu fixieren. Darüberhinauswerden durch diese Stäbe und Federn, d.h. genauer ihre Haken, mit denen sie an gesundenWirbeln befestigt werden, noch gesunde Teile der Wirbelsäule in Mitleidenschaftbezogen bzw. müssen für die Anwendung dieser Stabilisatoren in der Nähe der ruhigzustellendenWirbelgelenke gesunde Wirbel für die Verankerung vorhandensein.At least one of these hooks is connected to a threaded nut(Hackenbroch and Witt: Orthopädischchirurgischer Operationsatlas, Volume III, page65 and 127, Stuttgart, 1974). As well as other constructions where theIf springs acting at the height of several vertebrae are used, these rods are notpossible to fix directly adjacent vertebrae against each other. Furthermoreare made by these rods and springs, i.e. more precisely their hooks with which they are healthyVertebrae are attached, but healthy parts of the spine are still affectedrelated or must for the application of these stabilizers in the vicinity of the immobilizedVertebral joints healthy vertebrae for anchoring are present.
Weiterhin sind aus Platten oder Schienen bestehende Konstruktionenbekannt, die direkt an den zu fixierenden Wirbeln, beispielsweise durch Schraubenund/oder Metellstifte, be-festigt werden (Operationsatlas, Seite212). Zwar ist es mit diesen Platten und Schienen möglich, auch benachbarte Wirbelgegeneinander zu fixieren; ebenso wie bei einer Fixierung durch Knochenspäne (Operationsatlas,Seite 208/209) ist der Abstand, in dem die beiden Wirbel ruhiggestellt werden, jedochbei diesen Konstruktionen nicht einstellbar.Furthermore, constructions are made of plates or railsknown to be attached directly to the vertebrae to be fixed, for example by screwsand / or metal pins,be consolidated (Operating Atlas, page212). Although it is possible with these plates and rails, also neighboring vertebraeto fix against each other; as well as in the case of fixation with bone chips (surgical atlas,Page 208/209) is the distance at which the two vertebrae are immobilized, howevernot adjustable with these constructions.
Aufgabe der Erfindung ist es, einen Spondylodese-Stabilisator zu schaffen,der die Vorteile der beiden bekannten Konstruktionsprinzipien vereinigt, ohne dassdie geschilderten Nachteile in Kauf genommen werden müssen. Diese Aufgabe wird mitder vorliegenden Erfindung gelöst durch an je einem der zu fixierenden Wirbel zubefestigende Laschen, die Gewindebohrungen mit gegenläufigem Umlaufsinn haben, undferner durch Verbindungsbolzen, die durch Mittel für das Angreifen eines Werkzeugsgetrennte gegensinnige Gewinde tragen. Die Gewindebohrungen tragenden Laschen werdendabei mit Vorteil durch Knochenschrauben, die durch den Wirbelbogenfuss (Pedikel)hindurch bis in den Wirbelkörper reichen, befestigt, wobei zum Ausgleich von KnochenunebenheitenUnterlagscheiben vorgesehen sein können. Durch Verdrehen des Verbindungsbolzensist es auf einfache Weise möglich, in gewissen Grenzen jeden beliebigen Abstandzwischen den beiden zu fixierenden Wirbeln einzustellen und darüberhinaus im Laufeder Zeit Korrekturen dieses Abstandes vorzunehmen. Ein weiterer Vorteil der neuenKonstruktion besteht darin, dass die mechanische Fixierung in unmittelbarer Näheder gegeneinander ruhigzustellenden Gelenkflächen erfolgt.The object of the invention is to create a spinal fusion stabilizer,which combines the advantages of the two well-known construction principles withoutthe disadvantages described must be accepted. This task is done withthe present invention solved by each one of the vertebrae to be fixedfastening tabs that have threaded holes with opposite directions of rotation, andfurthermore by connecting bolts, which by means for engaging a toolwear separate opposing threads. The tabs bearing the threaded holes will bewith the advantage of bone screws that pass through the vertebral arch foot (pedicle)extend through to the vertebral body, attached, to compensate for uneven bonesWashers can be provided. By turning the connecting boltit is possible in a simple way, within certain limits, any desired distancebetween the two vertebrae to be fixed and furthermore in the courseto make corrections to this distance over time. Another benefit of the newConstruction consists in having mechanical fixation in close proximityof the joint surfaces to be immobilized against each other.
Im folgenden wird die Erfindung anhand eines Ausführungsbeispielsnäher erläutert.In the following the invention is based on an exemplary embodimentexplained in more detail.
Fig. 1 zeigt in einer Ansicht von dorsal die Fixierung zweier Wirbelmit Hilfe der neuen Stabilisatoren;Fig. 2 ist eine Aufsicht aufFig. 1 von oben; Fig. 3 und 4 geben als Detail eine der Laschen in gleicher Darstellungwie Fig. 1 und 2 wieder. 1 shows the fixation of two vertebrae in a dorsal viewwith the help of the new stabilizers;Fig. 2 is a plan viewFig. 1 from above; 3 and 4 show one of the tabs in the same representation as a detaillike Fig. 1 and 2 again.
Zur Fixierung der zwischen zwei benachbarten Wirbeln 1 liegenden Gelenke2 sind an jedem Wirbel 1 beidseits ihrer Mittelebene Laschen 3' bzw. 3 " befestigt,von denen eine in einer der Darstellung der Fig. 1 und 2 entsprechenden Weise alsDetail in Fig. 3 und 4 gezeigt ist.To fix the joints lying between two adjacent vertebrae 12 tabs 3 'or 3 "are attached to each vertebra 1 on both sides of its median plane,of which one in a manner corresponding to the representation of FIGS. 1 and 2 asDetail in Figs. 3 and 4 is shown.
Die Laschen 3 haben zum einen eine Gewindebohrung 5 (Fig. 3), diebeispielsweise in Fig. 1 bei der rechten unteren und der linken oberen Lasche 3'einen Drehsinn (Rechtsgewinde) haben, der zu demjenigen (Linkgsgewinde) an der rechtenoberen und der linken unteren Lasche 3 " entgegengesetzt ist. Weiterhin besitzendie Laschen 3 eine senkrecht zur Gewindebohrung 5 verlaufende Bohrung 8.The tabs 3 have on the one hand a threaded hole 5 (Fig. 3), whichfor example in Fig. 1 at the right lower and the left upper flap 3 'have a direction of rotation (right-hand thread) that corresponds to the one (left-hand thread) on the rightupper and lower left flap 3 "is opposite. Continue to ownthe tabs 3 have a bore 8 running perpendicular to the threaded bore 5.
Die Befestigung der Laschen 3 im Wirbel erfolgt durch die Bohrungen8 hindurch mit Hilfe von relativ langen Knochenschrauben 4, die von dorsal durchdie Pedikel 6 hindurch tief in die Wirbelkörper 7 hin#ein reichen. Um dabei dierelativ starken Unebenheiten der Oberflächen der Pedikel 6 auszugleichen und einenfesten Sitz der Lasche 3 am Wirbelknochen zu gewährleisten, ist zwischen den Laschen3 und den Pedikeln 6 jeweils eine Unterlagsscheibe 9 (Fig. 2) vorgesehen.The fastening of the tabs 3 in the vertebra is done through the holes8 through with the help of relatively long bone screws 4, which from the dorsal throughthe pedicles 6 reach deep into the vertebral bodies 7. To do theto compensate for relatively strong unevenness of the surfaces of the pedicle 6 and oneTo ensure a firm fit of the flap 3 on the vertebral bone is between the flaps3 and the pedicles 6 each have a washer 9 (FIG. 2).
In die Gewindebohrungen 5 -der Laschen 3 sind Verbindungsbolzen 10eingeschraubt, die in ihren unteren bzw. ihren oberen Hälften den Gewinden der Laschen3' bzw. 3 " entsprechende Gewinde 11' und 11 " tragen. In der Mitte sind die gegenläufigenGewinde 11' und 11'' durch ein als Sechskant ausgebildetes Mittelstück 12 voneinandergetrennt; an dieses kann ein Schraubenschlüssel angreifen,wennder durch die Verbindungsbolzen 10 fixierte Abstand zwischen den Wirbeln 1 eingestelltoder verändert werden soll.Connecting bolts 10 are inserted into the threaded bores 5 of the tabs 3screwed in, the threads of the tabs in their lower or upper halves3 'or 3 "wear corresponding threads 11' and 11". In the middle are the opposing onesThread 11 'and 11' 'from one another by a center piece 12 designed as a hexagonseparated; a wrench can attack this,ifthe distance between the vertebrae 1 fixed by the connecting bolts 10 is setor should be changed.
LeerseiteBlank page
| Application Number | Priority Date | Filing Date | Title | 
|---|---|---|---|
| CH852680ACH646857A5 (en) | 1980-11-18 | 1980-11-18 | SPONDYLODESIS STABILIZER. | 
| Publication Number | Publication Date | 
|---|---|
| DE3132520A1true DE3132520A1 (en) | 1982-06-16 | 
| DE3132520C2 DE3132520C2 (en) | 1985-03-07 | 
| Application Number | Title | Priority Date | Filing Date | 
|---|---|---|---|
| DE19813132520ExpiredDE3132520C2 (en) | 1980-11-18 | 1981-08-18 | Spinal fusion stabilizer | 
| Country | Link | 
|---|---|
| AT (1) | AT387710B (en) | 
| CH (1) | CH646857A5 (en) | 
| DE (1) | DE3132520C2 (en) | 
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| AT387710B (en) | 1989-03-10 | 
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| Date | Code | Title | Description | 
|---|---|---|---|
| OP8 | Request for examination as to paragraph 44 patent law | ||
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition |