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WO2006103245A1 - Large-fragment plate comprising a screwable adapter - Google Patents

Large-fragment plate comprising a screwable adapter Download PDF

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Publication number
WO2006103245A1
WO2006103245A1 PCT/EP2006/061115 EP2006061115W WO2006103245A1 WO 2006103245 A1 WO2006103245 A1 WO 2006103245A1 EP 2006061115 W EP2006061115 W EP 2006061115W WO 2006103245 A1 WO2006103245 A1 WO 2006103245A1
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WO
WIPO (PCT)
Prior art keywords
screw
adapter
fragment
fragment plate
stable
Prior art date
Application number
PCT/EP2006/061115
Other languages
German (de)
French (fr)
Inventor
Frank Orschler
Erich Orschler
Original Assignee
Königsee Implantate und Instrumente zur Osteosynthese GmbH
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 Königsee Implantate und Instrumente zur Osteosynthese GmbH filed Critical Königsee Implantate und Instrumente zur Osteosynthese GmbH
Publication of WO2006103245A1 publication Critical patent/WO2006103245A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8033—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
    • A61B17/8047—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers wherein the additional element surrounds the screw head in the plate hole

Definitions

  • the invention relates to a large fragment plate with at least one provided for receiving a large fragment screw fixed angular stable threaded hole.
  • Large-fragment plates are used for stabilizing bone fragments of a splinter fracture, in particular in the context of skull and jaw surgery, but also complicated fractures of the extremities.
  • One or more angle-stable threaded bores are used to fasten the large-fragment plate, in each of which a bone screw is screwed in and driven through the large-fragment plate into the bone.
  • the angle of the screw driven in against the normal direction of the plate is determined by the design of the thread pairing.
  • Such a fixed and predetermined angular position is disadvantageous as soon as the bone screw in an angle other than the predetermined angle is to be screwed into the bone fragment for operational reasons.
  • a different model of the bulk fragment plate has to be resorted to, or the use of the large fragment plate has to be referred to one or more variable-pitch, variable-pitch small-fragment plates. It will be understood that this will require either the provision of a larger number of large fragmentation plates or the benefits of using a large fragmentation plate.
  • the large fragment plate is characterized by a screw-in the angle-stable thread adapter for receiving a screw-in adapter small fragment screw with a variable angular stable position.
  • the adapter is introduced into the fixed angle-stable thread arranged in the large-fragment plate.
  • the small fragment screw is attached according to the required angular position of the adapter and screwed into this angle position in the adapter.
  • the KleinfragmentD screw then sits inside of the adapter angle stable.
  • their angular position can be chosen variably before screwing in a convenient manner.
  • an adapter Through the use of such an adapter, it is possible to use conventional large-fragment plates with fixed angle stable threads even where a variable angularly stable screw is required.
  • the adapter can be inserted and removed in a very simple manner if necessary in the fixed angle stable thread, without changing the structural design of the large fragment plate, in particular the design of the fixed angle stable thread.
  • the adapter is expediently in the form of a Einschraubringes with a suitable for the fixed angularly stable thread external thread and a screw hole with a tapered in a central portion cross-section.
  • the external thread serves to anchor the adapter in the fixed angle stable thread of the large fragment plate.
  • the screw-in bore has a shape similar to a rotational hyperboloid.
  • the small fragment screw is driven along the flanks of the Einschraubbohrung screwed through the screw in any angular position, the tapered shape of the screw hole ensures a secure angular stable hold and engagement of the small fragment screw.
  • the screw-in has further in the frontal region of the Einschraubringes one for engagement of a fastening tool, in particular a polygonal key, suitable cross-sectional shape.
  • a fastening tool in particular a polygonal key, suitable cross-sectional shape.
  • the corners of this polygonal shape, in particular a hexagonal shape, also provide Ansetzis for positioning the small fragment screws and prevent slipping of the screws when driving into the screw-in.
  • the adapter is expediently made of one for a cutting
  • Screwing the small fragment screw suitable material in particular a plastic material formed. This avoids excessive force exerted when driving in the screws and at the same time guarantees a secure hold of the screw.
  • a small fragment screw having an inner through hole for a guide and fastening means, in particular a drill wire or a guide wire.
  • a guide and fastening means in particular a drill wire or a guide wire.
  • further fastening elements can be driven in a corresponding angular position into the bone.
  • FIG. 1 is a plan view of the Einschraubringes of Fig. 1,
  • Fig. 3 is a representation of a screw-in section with a screwed small fragment screw.
  • Fig. 4 is a detail view of the external thread of the small fragment screw.
  • Fig. 1 shows a side view of the Einschraubringes 10 in partial section.
  • the screw-in ring has an external thread 20 which fits into a fixed angle-stable threaded bore which is introduced in a large-fragment plate. According to the usual configuration for such thread, the external thread may have a conical shape.
  • a screw-in bore 22 introduced in the interior of the EinD screw ring has a tapered cross-section in a middle section 23. The taper is given in the embodiment shown in Fig. 1 by a concave configuration of the screw-in.
  • the radius of curvature R of the inner wall of the screw-in bore is expediently dimensioned such that a small-dimensioned screw obliquely, i. can be screwed diagonally through the bore and the inner wall of the bore touches each at a first flank and an opposite flank.
  • the cross-section of the screw-in bore in the region of the narrowed central portion 23 may be designed so that the small fragmentary screw also vertical, i. along the symmetry axis can be screwed into the screw-in.
  • the design of the EinschraubDbohrung 22 thus allows both an oblique, as well as a vertical screwing the small fragment screw, the direction can be selected completely independent of the angular position of the thread in the large fragment plate.
  • Fig. 2 shows the embodiment shown in Fig. 1 in a plan view.
  • the contour 25 of the opening of the Einschraubloch has a series of AusbuchDtitch 26, which together give the shape of a hexagon.
  • the hexagon thus formed fulfills a dual function. On the one hand, it serves as an engagement for a hexagon Allen key for screwing in and loosening the screw-in ring into the threaded hole of the large-fragment plate.
  • the bulges 26 can be used as a guide for applying and screwing the small fragment screw.
  • the shape of the Allen wrench or the required azimuthal positions of the small fragment screw bulges may be provided which also form other shapes, in particular a triangular, square or the like polygonal, or a star shape.
  • the screw-in ring shown in Figures 1 and 2 consists of a material that allows a cutting screwing the small fragment screw.
  • the A- screw hole therefore has no preformed internal thread.
  • the screw-in is therefore made of a solid, but sufficiently soft material that shows no particular chip or burr formation when screwing in the small fragment screw and the small fragment screw surrounds sufficiently tight.
  • biologically well-tolerated and known in the medical prosthetic field plastics can be used for this purpose.
  • Fig. 3 shows the Einschraubring shown in Fig. 1 and 2 with a screwed-DE small screw 27 with a small fragment thread 28.
  • the thread teeth of the small fragment thread cut into the inner edges of the screw 22 a.
  • the small fragmentary screw 27 is clamped stable angle in the screw-in. Due to the rotational symmetry of the screw-in hole, the small-fragment screw can be variably screwed in at any azimuthal angle within the screw-in ring.
  • the size of the screw-in winch a depends on the dimensions of the screw-in bore and the respectively used small-diameter screw, in particular on its cross-sections or the size of the radius of curvature R and the material thickness of the screw-in ring.
  • the design of the external thread corresponds to the thread on the head part of the small fragment screw of a conventional large fragment screw countersunk into the large-scale fragment plate.
  • the flanks of the threads have a slightly asymmetrical shape.

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Abstract

The invention relates to a large-fragment plate comprising at least one fixed, angularly stable threaded borehole used to receive a large-fragment screw. According to the invention, an adapter (10) that can be screwed into the angularly stable screw thread is used to receive, in any angularly stable position, a small fragment screw (27) that can be screwed into the adapter. The invention also relates to an adapter for a large-fragment plate, said adapter being embodied with an external thread (20) which is complementary to the internal thread of at least one threaded borehole arranged in the large-fragment plate, and a through-opening (22). The adapter also comprises an assembly aid, such that it can receive a self-cutting threaded screw in any angular position, via the through-opening, once it has been mounted in the threaded borehole of the large-fragment plate. To this end, the adapter consists of a material having residual elastic properties, especially a plastic material.

Description

Beschreibung Großfragmentplatte Description large fragment plate
[0001][0001]
[0002] Die Erfindung betrifft eine Großfragmentplatte mit mindestens einer zur Aufnahme einer Großfragmentschraube vorgesehenen fixen winkelstabilen Gewindebohrung.The invention relates to a large fragment plate with at least one provided for receiving a large fragment screw fixed angular stable threaded hole.
[0003] Großfragmentplatten werden zum Stabilisieren von Knochenfragmenten eines Splitterbruches insbesondere im Rahmen der Schädel- und Kieferchirurgie, aber auch komplizierter Knochenbrüche der Extremitäten verwendet. Zum Befestigen der Großfragmentplatte dienen eine oder mehrere winkelstabile Gewindebohrungen, in die jeweils eine Knochenschraube eingeschraubt und durch die Großfragmentplatte in den Knochen getrieben wird. Bei einem derartigen winkelstabilen Gewinde ist der Winkel der hineingetriebenen Schraube gegenüber den Normalenrichtung der Platte durch die Gestaltung der Gewindepaarung vorgegeben.Large-fragment plates are used for stabilizing bone fragments of a splinter fracture, in particular in the context of skull and jaw surgery, but also complicated fractures of the extremities. One or more angle-stable threaded bores are used to fasten the large-fragment plate, in each of which a bone screw is screwed in and driven through the large-fragment plate into the bone. In such an angle-stable thread, the angle of the screw driven in against the normal direction of the plate is determined by the design of the thread pairing.
[0004] Eine derartige fixe und vorgegebene Winkelstellung ist nachteilig, sobald aus operativen Gründen die Knochenschraube in einem anderen als dem vorgeD geben Winkel in das Knochenfragment einzuschrauben ist. In diesem Fall muss entweder auf ein anderes Modell der Großfragmentplatte zurückgeD griffen werden, oder es muss auf den Einsatz der Großfragmentplatte zugunsten einer oder mehrerer Kleinfragmentplatten mit variablen winkelDstabilen Gewinden verwiesen werden. Es versteht sich, dass dadurch entDweder eine größere Anzahl von Großfragmentplatten bereitgehalten werden muss oder die Vorteile, die der Einsatz einer Großfragmentplatte bietet, nicht zum Tragen kommen.Such a fixed and predetermined angular position is disadvantageous as soon as the bone screw in an angle other than the predetermined angle is to be screwed into the bone fragment for operational reasons. In this case either a different model of the bulk fragment plate has to be resorted to, or the use of the large fragment plate has to be referred to one or more variable-pitch, variable-pitch small-fragment plates. It will be understood that this will require either the provision of a larger number of large fragmentation plates or the benefits of using a large fragmentation plate.
[0005] Es besteht somit die Aufgabe, eine Vorrichtung anzugeben, mit der es möglich ist, herkömmliche Großfragmentplatten mit fixen winkelstabilen Gewinden mit einem möglichst geringen Aufwand dahingehend auszubilden, dass auch ein Einsatz in einer variablen winkelstabilen Verschraubung möglich ist.It is therefore the object to provide a device with which it is possible to form conventional large-fragment plates with fixed angle stable threads with the least possible effort to the effect that an insert in a variable angle stable screw is possible.
[0006] Die Aufgabe wird mit einer Großfragmentplatte mit den Merkmalen des Anspruchs 1 bzw. einem Adapter nach Anspruch 6 gelöst, wobei die Unteransprüche vorteilhafte bzw. zweckmäßige Ausführungsformen beinhalten.The object is achieved with a large fragment plate with the features of claim 1 and an adapter according to claim 6, wherein the dependent claims include advantageous or expedient embodiments.
[0007] Erfindungsgemäß ist die Großfragmentplatte durch einen in das winkelstabile Gewinde einschraubbaren Adapter zur Aufnahme einer in den Adapter einschraubbaren Kleinfragmentschraube mit einer variabel winkelstabilen Lage gekennzeichnet.According to the invention, the large fragment plate is characterized by a screw-in the angle-stable thread adapter for receiving a screw-in adapter small fragment screw with a variable angular stable position.
[0008] Der Adapter wird bei Bedarf in das in der Großfragmentplatte angeordnete fixe winkelstabile Gewinde eingebracht. Die Kleinfragmentschraube wird entsprechend der geforderten Winkellage an den Adapter angesetzt und in dieser Winkellage in den Adapter hineingeschraubt. Die KleinfragmentD schraube sitzt anschließend innerhalb des Adapters winkelstabil. Ihre Winkellage kann jedoch vor dem Einschrauben in einer zweckmäßigen Weise variabel gewählt werden.If necessary, the adapter is introduced into the fixed angle-stable thread arranged in the large-fragment plate. The small fragment screw is attached according to the required angular position of the adapter and screwed into this angle position in the adapter. The KleinfragmentD screw then sits inside of the adapter angle stable. However, their angular position can be chosen variably before screwing in a convenient manner.
[0009] Durch den Einsatz eines derartigen Adapters ist es möglich, herkömmliche Großfragmentplatten mit fixen winkelstabilen Gewinden auch dort einzusetzen, wo eine variable winkelstabile Verschraubung erforderlich ist. Der Adapter kann in einer sehr einfachen Weise bei Bedarf in das fixe winkelstabile Gewinde eingefügt und entnommen werden, ohne den konstruktiven Aufbau der Großfragmentplatte, insbesondere die Gestaltung des fixen winkelstabilen Gewindes, zu verändern.Through the use of such an adapter, it is possible to use conventional large-fragment plates with fixed angle stable threads even where a variable angularly stable screw is required. The adapter can be inserted and removed in a very simple manner if necessary in the fixed angle stable thread, without changing the structural design of the large fragment plate, in particular the design of the fixed angle stable thread.
[0010] Der Adapter ist zweckmäßigerweise in Form eines Einschraubringes mit einem für das fixe winkelstabile Gewinde passfähigen Außengewinde und einer Einschraubbohrung mit einem in einem Mittelabschnitt verjüngten Querschnitt ausgebildet. Das Außengewinde dient der Verankerung des Adapters im fixen winkelstabilen Gewinde der Großfragmentplatte. Die Einschraubbohrung weist durch ihren im Mittelabschnitt verjüngten Querschnitt eine einem RotationsDhyperboloiden ähnelnde Form auf. Die Kleinfragmentschraube wird entlang der Flanken der Einschraubbohrung durch den Einschraubring in beliebiger Winkellage schraubend hinein getrieben, wobei die verjüngte Form der Einschraubbohrung einen sicheren winkelstabilen Halt und Eingriff der Kleinfragmentschraube gewährleistet.The adapter is expediently in the form of a Einschraubringes with a suitable for the fixed angularly stable thread external thread and a screw hole with a tapered in a central portion cross-section. The external thread serves to anchor the adapter in the fixed angle stable thread of the large fragment plate. By means of its cross-section, which is tapered in the middle section, the screw-in bore has a shape similar to a rotational hyperboloid. The small fragment screw is driven along the flanks of the Einschraubbohrung screwed through the screw in any angular position, the tapered shape of the screw hole ensures a secure angular stable hold and engagement of the small fragment screw.
[0011] Die Einschraubbohrung weist weiterhin im stirnseitigen Bereich des Einschraubringes eine für einen Eingriff eines Befestigungswerkzeuges, insbesondere eines Mehrkantschlüssels, geeignete Querschnittsform auf. Die Ecken dieser Mehrkantform, insbesondere einer Sechskantform, bieten darüber hinaus Ansetzpunkte zum Positionieren der Kleinfragmentschrauben und verhindern ein Abrutschen der Schrauben beim Hineintreiben in den Einschraubring.The screw-in has further in the frontal region of the Einschraubringes one for engagement of a fastening tool, in particular a polygonal key, suitable cross-sectional shape. The corners of this polygonal shape, in particular a hexagonal shape, also provide Ansetzpunkte for positioning the small fragment screws and prevent slipping of the screws when driving into the screw-in.
[0012] Der Adapter ist zweckmäßigerweise aus einem für ein schneidendesThe adapter is expediently made of one for a cutting
HineinD schrauben der Kleinfragmentschraube geeignetem Werkstoff, insbesondere einem Kunststoffmaterial, ausgebildet. Damit wird eine übermäßige Kraftanstrengung beim Hineintreiben der Schrauben vermieden und gleichzeitig ein sicherer Halt der Schraube garantiert.Screwing the small fragment screw suitable material, in particular a plastic material formed. This avoids excessive force exerted when driving in the screws and at the same time guarantees a secure hold of the screw.
[0013] Besonders vorteilhaft ist in diesem Zusammenhang die Verwendung einer Kleinfragmentschraube, die eine innere Durchgangsbohrung für ein Führungs- und Befestigungsmittel, insbesondere einen Bohrdraht oder einen Führungsdraht, aufweist. In diesem Fall können zusätzlich zur variablen winkelstabilen Verschraubung der Großfragmentplatte im Knochenfragment weitere Befestigungselemente in einer entsprechenden Winkellage in den Knochen getrieben werden.Particularly advantageous in this context is the use of a small fragment screw having an inner through hole for a guide and fastening means, in particular a drill wire or a guide wire. In this case, in addition to the variable angle stable screw connection of the large fragment plate in the bone fragment, further fastening elements can be driven in a corresponding angular position into the bone.
[0014] Die Erfindung soll nachfolgend anhand eines Ausführungsbeispiels näher erläutert werden. Zur Verdeutlichung dienen die Figuren 1 bis 4. Es werden für gleiche oder gleichwirkende Teile die selben Bezugszeichen verwendet. Es zeigt: [0015] Fig. 1 eine Seitenansicht des Einschraubringes in einem Teilschnitt,The invention will be explained in more detail with reference to an embodiment. For clarity, Figures 1 to 4 are used. The same reference numerals are used for the same or equivalent parts. It shows: 1 is a side view of the Einschraubringes in a partial section,
[0016] Fig. 2 eine Draufsicht des Einschraubringes aus Fig. 1,2 is a plan view of the Einschraubringes of Fig. 1,
[0017] Fig. 3 eine Darstellung eines Einschraubringes im Schnitt mit einer eingeschraubten Kleinfragmentschraube.Fig. 3 is a representation of a screw-in section with a screwed small fragment screw.
[0018] Fig. 4 eine Detailansicht des Außengewindes der Kleinfragmentschraube.Fig. 4 is a detail view of the external thread of the small fragment screw.
[0019] Fig. 1 zeigt eine Seitenansicht des Einschraubringes 10 im Teilschnitt. Der Einschraubring weist ein zu einer in einer Großfragmentplatte eingebrachten fixen winkelstabilen Gewindebohrung passendes Außengewinde 20 auf. Entsprechend der für derartige Gewinde üblichen Gestaltung kann das Außengewinde eine konische Form aufweisen. Eine im Inneren des EinD Schraubringes eingebrachte Einschraubbohrung 22 weist in einem MittelD abschnitt 23 einen verjüngten Querschnitt auf. Die Verjüngung ist bei dem in Fig. 1 gezeigten Ausführungsbeispiel durch eine konkave Gestaltung der Einschraubbohrung gegeben. Der Krümmungsradius R der Innenwand der Einschraubbohrung ist zweckmäßigerweise so bemessen, dass eine KleinfragDmentschraube schräg, d.h. winkelvariabel durch den Einschraubring eingeDschraubt werden kann, wobei Schraube diagonal durch die Bohrung geführt wird und die Innenwand der Bohrung jeweils an einer ersten Flanke und einer gegenüberliegenden Flanke berührt.Fig. 1 shows a side view of the Einschraubringes 10 in partial section. The screw-in ring has an external thread 20 which fits into a fixed angle-stable threaded bore which is introduced in a large-fragment plate. According to the usual configuration for such thread, the external thread may have a conical shape. A screw-in bore 22 introduced in the interior of the EinD screw ring has a tapered cross-section in a middle section 23. The taper is given in the embodiment shown in Fig. 1 by a concave configuration of the screw-in. The radius of curvature R of the inner wall of the screw-in bore is expediently dimensioned such that a small-dimensioned screw obliquely, i. can be screwed diagonally through the bore and the inner wall of the bore touches each at a first flank and an opposite flank.
[0020] Zweckmäßigerweise kann der Querschnitt der Einschraubbohrung im Bereich des verengten Mittelabschnitts 23 so ausgeführt sein, dass die KleinfragDmentschraube auch senkrecht, d.h. entlang der Symmetrieachse in den Einschraubring eingeschraubt werden kann. Die Gestaltung der EinschraubDbohrung 22 ermöglicht somit sowohl ein schräges, als auch ein senkrechtes Einschrauben der Kleinfragmentschraube, wobei die Richtung vollkommen unabhängig von der Winkellage des Gewindes in der Großfragmentplatte gewählt werden kann.Conveniently, the cross-section of the screw-in bore in the region of the narrowed central portion 23 may be designed so that the small fragmentary screw also vertical, i. along the symmetry axis can be screwed into the screw-in. The design of the EinschraubDbohrung 22 thus allows both an oblique, as well as a vertical screwing the small fragment screw, the direction can be selected completely independent of the angular position of the thread in the large fragment plate.
[0021] Fig. 2 zeigt die in Fig. 1 gezeigte Ausführungsform in einer Draufsicht. Die Kontur 25 der Öffnung des Einschraubloches weist eine Reihe von AusbuchDtungen 26 auf, die zusammen die Form eines Sechskantes ergeben. Der so gebildete Sechskant erfüllt eine Doppelfunktion. Zum einen dient er als Eingriff für einen Sechskant- Inbus-Schlüssel zum Einschrauben und Lösen des Einschraubringes in die Gewindebohrung der Großfragmentplatte. Zum anderen können die Ausbuchtungen 26 als Führung zum Ansetzen und Einschrauben der Kleinfragmentschraube verwendet werden. Entsprechend der Form des Inbus-Schlüssels bzw. der geforderten azimutalen Positionen der Kleinfragmentschraube können Ausbuchtungen vorgesehen sein, die auch andere Formen, insbesondere einen Dreikant, Vierkant oder dergleichen Mehrkant, oder eine Sternform bilden.Fig. 2 shows the embodiment shown in Fig. 1 in a plan view. The contour 25 of the opening of the Einschraubloch has a series of AusbuchDtungen 26, which together give the shape of a hexagon. The hexagon thus formed fulfills a dual function. On the one hand, it serves as an engagement for a hexagon Allen key for screwing in and loosening the screw-in ring into the threaded hole of the large-fragment plate. On the other hand, the bulges 26 can be used as a guide for applying and screwing the small fragment screw. According to the shape of the Allen wrench or the required azimuthal positions of the small fragment screw bulges may be provided which also form other shapes, in particular a triangular, square or the like polygonal, or a star shape.
[0022] Der in den Figuren 1 und 2 gezeigte Einschraubring besteht aus einem Werkstoff, der ein schneidendes Einschrauben der Kleinfragmentschraube ermöglicht. Die Ein- schraubbohrung weist demnach kein vorgeformtes Innengewinde auf. Es ist jedoch möglich, vor dem Einschrauben der eigentlichen Kleinwinkelschraube ein Innengewinde in den bereits in die Großfragmentplatte eingebrachten Einschraubring zu schneiden und anschließend die Kleinfragmentschraube einzuschrauben. Der Einschraubring besteht daher aus einem festen, aber ausreichend weichen Werkstoff, der insbesondere beim Hineindrehen der Kleinfragmentschraube keine Span- oder Gratbildung zeigt und die Kleinfragmentschraube hinreichend fest umschließt. Zweckmäßigerweise können hierfür biologisch gut verträgliche und im medizinisch-pro- thetischen Bereich bekannte Kunststoffe verwendet werden.The screw-in ring shown in Figures 1 and 2 consists of a material that allows a cutting screwing the small fragment screw. The A- screw hole therefore has no preformed internal thread. However, it is possible to cut an internal thread in the already introduced into the large fragment plate screw-in before screwing the actual small angle screw and then screw the small fragment screw. The screw-in is therefore made of a solid, but sufficiently soft material that shows no particular chip or burr formation when screwing in the small fragment screw and the small fragment screw surrounds sufficiently tight. Appropriately, biologically well-tolerated and known in the medical prosthetic field plastics can be used for this purpose.
[0023] Anstelle einer massiven konventionellen Kleinfragmentschraube ist es ohne weiteres möglich, Schraubhülsen oder hohle Kleinfragmentschrauben als Führung für einen Bohrdraht oder Befestigungsdraht in den Einschraubring ein zu schrauben und somit letztlich die Großfragmentplatte, in welcher sich der Einschraubring befindet, als Führung und Arretierung für eine KnochenDbohrung zu benutzen oder die Großfragmentplatte mit einer ganzen Palette zusätzlicher Befestigungselemente zu kombinieren.Instead of a massive conventional small fragment screw, it is readily possible to screw a screw or hollow small fragment screws as a guide for a drill wire or wire in the screw one and thus ultimately the large fragment plate in which the screw is located as a guide and lock for a To use bone drilling or to combine the large fragment plate with a whole range of additional fasteners.
[0024] Fig. 3 zeigt den in Fig. 1 und 2 gezeigten Einschraubring mit einer eingeD schraubten Kleinfragmentschraube 27 mit einem Kleinfragmentgewinde 28. Wie aus der Figur zu entnehmen ist, schneiden die Gewindezähne des Kleinfragmentgewindes in die Innenflanken der Einschraubbohrung 22 ein. Durch die konvexe Krümmung der Einschraubbohrung und den verjüngten Mittelabschnitt 23 ist die Kleinfragmentschraube 27 winkelstabil in die Einschraubbohrung eingespannt. Durch die Rotationssymmetrie der Einschraubbohrung kann die Kleinfragmentschraube in jedem beliebigen azimutalen Winkel innerhalb des Einschraubringes variabel eingeschraubt werden. Die Größe des Einschraub winkeis a richtet sich nach den AbmesDsungen der Einschraubbohrung und der jeweils verwendeten KleinfragDmenschraube, insbesondere nach deren Querschnitten bzw. der Größe des Krümmungsradius R und der Materialstärke des Einschraubringes.Fig. 3 shows the Einschraubring shown in Fig. 1 and 2 with a screwed-DE small screw 27 with a small fragment thread 28. As can be seen from the figure, the thread teeth of the small fragment thread cut into the inner edges of the screw 22 a. Due to the convex curvature of the Einschraubbohrung and the tapered central portion 23, the small fragmentary screw 27 is clamped stable angle in the screw-in. Due to the rotational symmetry of the screw-in hole, the small-fragment screw can be variably screwed in at any azimuthal angle within the screw-in ring. The size of the screw-in winch a depends on the dimensions of the screw-in bore and the respectively used small-diameter screw, in particular on its cross-sections or the size of the radius of curvature R and the material thickness of the screw-in ring.
[0025] Fig. 4 zeigt einen größeren Ausschnitt des Außengewindes der für den Einschraubring vorgesehenen Kleinfragmentschraube im Detail. Im WesentDlichen entspricht die Gestaltung des Außengewindes dem Gewinde am Kopfteil der Kleinfragmentschraube einer konventionellen, in die GroßfragDmentplatte versenkten Großfragmentschraube. Wie aus der Figur zu entDnehmen ist, weisen die Flanken der Gewindegänge eine leicht asymmetrische Form auf.4 shows a larger section of the external thread of the small fragment screw provided for the screw-in ring in detail. Essentially, the design of the external thread corresponds to the thread on the head part of the small fragment screw of a conventional large fragment screw countersunk into the large-scale fragment plate. As can be seen from the figure, the flanks of the threads have a slightly asymmetrical shape.
[0026] Bezugszeichenliste[0026] List of Reference Numerals
[0027] 10 Einschraubring10 threaded ring
[0028] 20 Außengewinde20 external thread
[0029] 22 Einschraubbohrung22 screwed hole
[0030] 23 verjüngter Mittelabschnitt [0031] 25 sechskantförmige Querschnittsform23 tapered middle section 25 hexagonal cross-sectional shape
[0032] 26 Ausbuchtung26 bulge
[0033] 27 Kleinfragmentschraube27 small fragment screw
[0034] 28 Kleinfragmentgewinde28 small fragment thread
[0035] a EinschraubwinkelA screw-in angle
[0036] R KrümmungsradiusR radius of curvature
[0037] [0037]

Claims

Ansprücheclaims
[0001] Großfragmentplatte mit mindestens einer zur Aufnahme einer Großfragmentschraube vorgesehenen fixen winkelstabilen Gewindebohrung, gekennzeichnet durch einen in das winkelstabile Gewinde einschraubbaren Adapter zur Aufnahme einer in den Adapter einschraubbaren Kleinfragmentschraube (27) in einer variabel winkelstabilen Lage.Large fragment plate with at least one provided for receiving a large fragment screw fixed angle stable threaded hole, characterized by a screwed into the angularly stable adapter for receiving a screwed into the adapter small fragment screw (27) in a variable angular stable position.
[0002] Großfragmentplatte nach Anspruch 1, dadurch gekennzeichnet, dass der Adapter in Form eines Einschraubringes (10) mit einem für das winkelstabile Gewinde passfähigen Außengewinde (20) und einer Einschraubbohrung (22) mit einem in einem Mittelabschnitt (23) verjüngten Querschnitt ausgebildet ist.Large fragment plate according to claim 1, characterized in that the adapter in the form of a Einschraubringes (10) with a fit for the angular stable thread external thread (20) and a screw-in (22) with a in a central portion (23) is tapered cross-section ,
[0003] Großfragmentplatte nach Anspruch 1 und 2, dadurch gekennzeichnet, dass die Einschraubbohrung (22) im stirnseitigen Bereich des Einschraubringes (10) eine für einen Eingriff eines Befestigungswerkzeuges, insbesondere eines Mehrkantschlüssels, geeignete Querschnittsform (25) aufweist.Has large fragment plate according to claim 1 and 2, characterized in that the screw-in bore (22) in the frontal region of the Einschraubringes (10) for engagement of a fastening tool, in particular a polygonal key, suitable cross-sectional shape (25).
[0004] Großfragmentplatte nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, dass der Einschraubring aus einem für ein schneidendes Hineinschrauben der Kleinfragmentschraube geeigneten Werkstoff, insbesondere einem gewebefreundlichen Kunststoff, ausgebildet ist.Large-fragment plate according to one of claims 2 or 3, characterized in that the screw-in from a suitable for a cutting screwing in the small-fragment screw material, in particular a tissue-friendly plastic, is formed.
[0005] Großfragmentplatte nach Anspruch 1, dadurch gekennzeichnet, dass die Kleinfragmentschraube eine Bohrung für ein Führungs- und/oder Befestigungsmittel, insbesondere einen Bohrdraht oder Führungsdraht, aufweist.Large-fragment plate according to claim 1, characterized in that the small-fragment screw has a bore for a guide and / or fastening means, in particular a drill wire or guide wire.
[0006] Adapter für eine Großfragmentplatte mit einem Außengewinde, welches komplementär zum Innengewinde mindestens einer in der Großfragmentplatte befindlichen Gewindebohrung ausgebildet ist, wobei der Adapter eine Durchgangsöffnung aufweist und im Adapter eine Montagehilfe vorgesehen ist, so dass dieser nach Montage in der Gewindebohrung der Großfragmentplatte über die Durchgangsöffnung eine selbstschneidende Gewindeschraube in beliebiger, jedoch stabiler Winkellage aufnehmen kann und hierfür der Adapter aus einem über restelastische Eigenschaften verfügenden Material, insbesondere Kunststoff besteht. Adapter for a large fragment plate with an external thread which is complementary to the internal thread of at least one threaded hole located in the large fragment plate, wherein the adapter has a through hole and an adapter is provided in the adapter, so that this after mounting in the threaded hole of the large fragment plate over the passage opening can receive a self-tapping screw in any, but stable angular position and for this purpose the adapter consists of a material having residual elastic properties, in particular plastic.
PCT/EP2006/061115 2005-03-30 2006-03-28 Large-fragment plate comprising a screwable adapter WO2006103245A1 (en)

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DE200510014546 DE102005014546B4 (en) 2005-03-30 2005-03-30 Large fragment plate and adapter for a large fragment plate
DE102005014546.9 2005-03-30

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