DE19629011A1 - Auxiliary for promoting osteo-synthesis - Google Patents
Auxiliary for promoting osteo-synthesisInfo
- Publication number
- DE19629011A1 DE19629011A1 DE1996129011 DE19629011A DE19629011A1 DE 19629011 A1 DE19629011 A1 DE 19629011A1 DE 1996129011 DE1996129011 DE 1996129011 DE 19629011 A DE19629011 A DE 19629011A DE 19629011 A1 DE19629011 A1 DE 19629011A1
- Authority
- DE
- Germany
- Prior art keywords
- thread
- aid according
- screw
- bone
- osteosynthesis aid
- 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
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-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- 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, setting implements or the like
- 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
- A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
- A61B17/8057—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- 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, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary pins, nails or other devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- 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, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary pins, nails or other devices
- A61B17/7233—Intramedullary pins, nails or other devices with special means of locking the nail to the bone
- A61B17/7241—Intramedullary pins, nails or other devices with special means of locking the nail to the bone the nail having separate elements through which screws pass
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- 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, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- 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, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
- A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
Landscapes
- 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
Description
Die Erfindung bezieht sich auf ein Hilfsmittel für die Osteosynthese nach dem Oberbegriff des Anspruches 1.The invention relates to an aid for the Osteosynthesis according to the preamble of claim 1.
Zweck der Behandlung von Knochenbrüchen ist die Stabili sierung der Bruchstücke. Diese kann mit verschiedenen Hilfsmitteln erreicht werden. Die hier interessierenden Osteosynthesehilfsmittel haben einen Durchgangslöcher auf weisenden Kraftträger zum Überbrücken von Knochenfragmen ten und Schrauben zum Einschrauben in die Durchgangslöcher und in die Knochenfragmente, um die Knochenfragmente mit dem Kraftträger zu verbinden. Hierzu gehören Platten, Fixateure und Marknägel, die über Schrauben mit den Kno chenfragmenten verbunden werden. Marknägel sind grundsätz lich auch ohne Schrauben einsetzbar, stabilisieren die Fraktur jedoch erst durch den Einsatz von Verriegelungs schrauben in besonderem Maße gegen Drehbelastung und Ver kürzung.The purpose of treating broken bones is stabili fragmentation. This can be done with different Aids can be achieved. Those interested here Osteosynthesis aids have through holes Pointing force carrier for bridging bone fragments and screws for screwing into the through holes and into the bone fragments, using the bone fragments to connect the force carrier. This includes plates, Fixators and intramedullary nails over screws with the kno fragments. Intramedullary nails are fundamental can also be used without screws, stabilize the Fracture, however, only through the use of locking screw against torsional loads and Ver reduction.
Bei diesen Osteosynthesehilfsmitteln ist es wünschenswert, die Fragmente durch Festsetzen der Schrauben im Kraftträ ger an einer Lageänderung unter Belastung zu hindern. Außerdem ist vorteilhaft, die Schrauben unter Verschiede nen Winkeln in die Durchgangslöcher des Kraftträgers ein drehen zu können, beispielsweise um Zielfehler beim Setzen distaler Verriegelungsschrauben eines Marknagels aus zu gleichen oder um die Schrauben optimal auf die Fragmente auszurichten.With these osteosynthesis aids, it is desirable the fragments by tightening the screws in the Kraftträ to prevent a change of position under load. It is also advantageous to use different screws NEN angles in the through holes of the power carrier to be able to turn, for example, about target errors when setting distal locking screws of an intramedullary nail same or around the screws optimally on the fragments align.
Aus der DE 43 43 117 A1 ist ein Osteosynthesehilfsmittel der eingangs genannten Art bekannt, das eine Knochenplatte und mindestens eine Knochenschraube aufweist. Diese haben bevorzugt sphärische Sitzflächen, die eine gegenseitige Ausrichtung unter verschiedenen Winkeln ermöglichen, wobei die Sitzfläche der Knochenschraube an der Unterseite eines Schraubenkopfes ausgebildet sein kann. Außerdem hat zumin dest eine Sitzfläche ein vorgeformtes Gewinde, welches beim Eindrehen unter Materialumformung Gewindeverbindung mit der anderen Sitzfläche herstellt, wodurch die Schraube in ihrem Einschraubwinkel an der Platte gesichert wird. Das Gewindeformen durch Eindrehen der Schrauben kann je doch sehr kraftraubend sein und die Operation beeinträch tigen. Bei Fertigung der Schraube aus einem härteren und der Platte aus einem weicheren Material oder umgekehrt ist zwar das Eindrehen erleichtert, jedoch sind die mechani schen Eigenschaften des Osteosynthesehilfsmittels ungün stig eingeschränkt.DE 43 43 117 A1 is an osteosynthesis aid of the type mentioned that a bone plate and has at least one bone screw. Have this prefers spherical seats that are mutual Allow alignment at different angles, where the seat of the bone screw at the bottom of a Screw head can be formed. In addition, at least least a seat a pre-formed thread, which when screwing in under material forming threaded connection with the other seat, causing the screw is secured in its screw-in angle on the plate. The thread forming by screwing in the screws can each be very exhausting and affect the operation term. When manufacturing the screw from a harder and the plate is made of a softer material or vice versa screwing in is easier, but the mechani properties of the osteosynthesis aid limited.
Aus der DE 43 41 677 C1 ist ein Verriegelungsnagel für die Versorgung von Knochenfrakturen mit einem länglichen Kör per bekannt, der am vorderen Ende abgerundet ist und ein proximales Einschlagende aufweist. Im Verlauf des längli chen Körpers sind Querbohrungen zur Aufnahme jeweils einer Knochenschraube angeordnet. Der längliche Körper besteht aus Vollmaterial und weist zumindest an einer Seite jeder Querbohrung eine trichterförmige Öffnung auf, die das Ein setzen und Einschrauben der Knochenschrauben erleichtert. Zwischen trichterförmigen Öffnungen einer Querbohrung kann ein Ringsteg vorgesehen sein, der ein Gewinde zum Eindre hen einer Knochenschraube aufweist oder in den eine selbstschneidende Knochenschraube eindrehbar ist, um eine Verbindung zwischen Knochenschraube und Verriegelungsnagel zu schaffen, die sich nicht unbeabsichtigt löst. Bei Ein satz bevorzugter Materialien ist das Herstellen der Ver bindung ebenfalls kraftraubend und beeinträchtigt die Operation.DE 43 41 677 C1 is a locking nail for the Treatment of bone fractures with an elongated body per known, which is rounded at the front end and a has proximal impact end. In the course of the längli Chen body are cross holes for receiving one each Bone screw arranged. The elongated body exists made of solid material and faces at least on one side Cross bore a funnel-shaped opening that the one set and screwing in the bone screws easier. Can between a funnel-shaped openings of a cross hole an annular web can be provided which has a thread for insertion hen has a bone screw or in one self-tapping bone screw can be screwed in to a Connection between the bone screw and the locking nail to create that does not unintentionally come off. At on set of preferred materials is the manufacture of the ver binding also exhausts and affects the Surgery.
Davon ausgehend liegt der Erfindung die Aufgabe zugrunde, ein Osteosynthesehilfsmittel mit in einem Kraftträger festsetzbaren Schrauben zu schaffen, bei dem das Eindrehen der Schrauben erleichtert ist, ohne die mechanischen Ei genschaften des Osteosynthesehilfsmittels zu beeinträchti gen.Proceeding from this, the object of the invention is an osteosynthesis aid with in a force carrier fixable screws to create where screwing the screw is relieved without the mechanical egg properties of the osteosynthesis aid gene.
Die Aufgabe wird durch ein Osteosynthesehilfsmittel mit den Merkmalen des Anspruches 1 gelöst. Vorteilhafte Ausge staltungen des Hilfsmittels sind in den Unteransprüchen angegeben.The task is performed using an osteosynthesis aid solved the features of claim 1. Advantageous Ausge Events of the aid are in the subclaims specified.
Das erfindungsgemäße Osteosynthesehilfsmittel hat ledig lich im Bereich des mindestens einen Durchgangsloches des Kraftträgers eine verringerte Härte und ist im übrigen in einer den mechanischen Anforderungen entsprechenden Härte ausgeführt. Dabei ist die Härtereduzierung im Durchgangs lochbereich so optimiert, daß zum einen das Einformen des Gewindes durch Eindrehen der Schraube erleichtert und zum anderen das Festsetzen der Schraube im eingeformten Gewin de in dem erforderlichen Maße sichergestellt ist. So kön nen bei Verwendung von Reintitan der Bereich verringerter Härte den Härtegrad 1 (entspricht 0,2 Gew.-% Sauerstoffge halt) oder einen niedrigeren Härtegrad (z. B. 0,07 Gew.-% Sauerstoffanteil) und der übrige Bereich des Kraftträgers den Härtegrad 4 oder einen höheren Härtegrad haben. Die Härte der Schraube kann der größeren Härte des Kraftträ gers entsprechen. Bei einem Osteosynthesehilfsmittel mit mehreren Durchgangslöchern können deren Umgebungsbereiche und die einzusetzenden Schrauben jeweils entsprechend aus geführt sein.The osteosynthesis aid according to the invention is single Lich in the area of at least one through hole of the Power carrier a reduced hardness and is otherwise in a hardness corresponding to the mechanical requirements executed. The hardness is reduced in the passage Hole area optimized so that the molding of the Thread by lightening the screw and to others fixing the screw in the molded-in thread de is ensured to the extent necessary. So can the range is reduced when using pure titanium Hardness grade 1 (corresponds to 0.2% by weight oxygen hold) or a lower degree of hardness (e.g. 0.07% by weight Oxygen content) and the rest of the area of the force carrier have degree of hardness 4 or a higher degree of hardness. The Hardness of the screw can be the greater hardness of the Krafttra gers correspond. With an osteosynthesis aid with Several through holes can have their surrounding areas and the screws to be used accordingly be led.
Der Bereich verringerter Härte kann von einem Inlay, d. h.
von einem Einsatz gebildet sein, der am Umfang vom Grund
material des Kraftträgers umgeben ist. Er kann aber auch
von einem Kern gebildet sein, der in das Grundmaterial des
Kraftträgers eingebettet ist. Dabei kann ein Inlay oder
Kern einem oder mehreren Durchgangslöchern zugeordnet
sein. Diese Ausgestaltungen begünstigen eine solide Aus
führung des Osteosynthesehilfsmittels, insbesondere Mark
nagels
Bei Einsatz von Reintitan können Inlay oder Kern aus wei
cherem Reintitan durch Diffusionsschweißen und/oder Elek
tronenstrahlschweißen mit dem Grundmaterial aus härterem
Reintitan verbunden werden. Hierdurch wird ein homogenes
Werkstück erreicht, daß lediglich bereichsweise verschie
dene Härtegrade aufweist.The area of reduced hardness can be formed by an inlay, that is to say by an insert which is surrounded on the circumference by the base material of the force carrier. However, it can also be formed by a core which is embedded in the base material of the force carrier. An inlay or core can be assigned to one or more through holes. These configurations favor a solid implementation of the osteosynthesis aid, in particular Mark nagels
When using pure titanium, the inlay or core made of softer pure titanium can be connected to the base material made of harder pure titanium by diffusion welding and / or electron beam welding. As a result, a homogeneous workpiece is achieved that only has different degrees of hardness in some areas.
Außer Reintitan können rostfreier Stahl bzw. ein - gegebe nenfalls resorbierbarer - Kunststoff zum Einsatz kommen.In addition to pure titanium, stainless steel can be used if necessary, absorbable - plastic are used.
Zum weiteren Erleichtern des Gewindeformens kann das Osteosynthesehilfsmittel einen bolzenförmigen Vorformer haben, der in Knochenbohrungen ausrichtbar ist und ein Außengewinde zum Vorformen eines Gewindes im Durchgangs loch aufweist. Nach Anwenden des Vorformers wird das Ge winde durch Eindrehen der Schraube fertiggeformt.This can further facilitate thread forming Osteosynthesis aid a bolt-shaped preformer have, which can be aligned in bone holes and a External thread for preforming a thread in the passage has hole. After applying the preform, the Ge winch fully formed by screwing in the screw.
Das Durchgangsloch kann zu mindestens einer Seite des Kraftträgers hin aufgeweitet sein, um verschiedene Winkel ausrichtungen der Schraube zum Kraftträger zu begünstigen. Aus demselben Grunde kann das Durchgangsloch am Übergang einer Aufweitung in einem Gewindebereich gerundet sein.The through hole can on at least one side of the Power carrier to be expanded to different angles to favor alignments of the screw to the force carrier. For the same reason, the through hole at the transition an expansion in a threaded area.
Bei dem Kraftträger kann es sich um einen Marknagel han deln und die Schrauben kann eine Verriegelungsschraube sein. Der Kraftträger kann aber auch eine Knochenplatte und die Schraube eine Knochenschraube sein. Die Erfindung kann insbesondere bei einem System gemäß DE 43 43 117 A1 zur Anwendung kommen. The force carrier can be an intramedullary nail and the screws can be a locking screw be. The force carrier can also be a bone plate and the screw will be a bone screw. The invention can in particular in a system according to DE 43 43 117 A1 come into use.
Im Rahmen der Erfindung kann das mindestens eine Durch gangsloch im Grundmaterial der Schraube ausgebildet und mit einem Innengewinde als Formgewinde ausgebildet sein, wobei ein Schraubenbolzen in das Durchgangsloch unter For men eines Außengewindes an seinem Mantel eindrehbar ist und der Schraubenbolzen außen einen Bereich verringerter Härte hat, der das Einformen des Gewindes erleichtert und das Festsetzen des Schraubenbolzens in dem eingeformten Gewinde sicherstellt. Bei dem Bereich verringerter Härte kann es sich insbesondere um eine Hülse oder um eine Scha le handeln, die mit dem härteren Grundmaterial eines Schraubenbolzens oder der Unterseite des Kopfes eines Schraubenbolzens verbunden ist.In the context of the invention, the at least one through hole formed in the base material of the screw and be designed with an internal thread as a form thread, with a bolt in the through hole under For men of an external thread is screwed into his jacket and the bolt reduced an area outside Hardness, which facilitates the forming of the thread and fixing the bolt in the molded Thread ensures. In the area of reduced hardness can in particular be a sleeve or a Scha le deal with the harder base material of a Bolt or the bottom of a head Bolt is connected.
Die Erfindung wird nachfolgend anhand der Beschreibung von Ausführungsbeispielen unter Bezugnahme auf die anliegenden Zeichnungen näher erläutert. In den Zeichnungen zeigen:The invention is described below based on the description of Embodiments with reference to the accompanying Drawings explained in more detail. The drawings show:
Fig. 1 einen Marknagel mit Verriegelungsschrauben in einem Röhrenknochen im schematischen Längsschnitt; FIG. 1 shows an intramedullary nail with locking screws in a tubular bone in schematic longitudinal section;
Fig. 2 vergrößerter Ausschnitt II der Fig. 1; Fig. 2 enlarged section II of Fig. 1;
Fig. 3 eine Knochenplatte mit Knochenschraube an einem Röhrenknochen in schematischem Längsschnitt; Figure 3 is a bone plate with bone screw to a long bone in schematic longitudinal section.
Fig. 4 die Knochenplatte gemäß Fig. 3 in der Draufsicht; Fig. 4 is the bone plate of Figure 3 in plan view.
Fig. 5 einen Vorformer für die Knochenplatte gemäß Fig. 3 und 4 in Seitenansicht. Fig. 5 is a preformer for the bone plate of FIG. 3 and 4 in side view.
Gemäß Fig. 1 hat ein Röhrenknochen 1 eine Fraktur 2, die von einem Marknagel 3 überbrückt wird. Der Marknagel 3 ist auf beiden Seiten der Fraktur 2 über jeweils zwei Verrie gelungsschrauben 4 mit den Fragmenten verbunden.According to Fig. 1 has a long bone fracture 1 2, which is bridged by an intramedullary nail. 3 The intramedullary nail 3 is connected on both sides of the fracture 2 via two locking screws 4 with the fragments.
Für jede Verriegelungsschraube 4 hat der Marknagel 3 ein Durchgangsloch 5, das zu beiden Seiten hin trichterförmige Aufweitungen 6 und in der Mitte einen Gewindebereich 7 hat, wobei die Übergänge 8 zwischen den Aufweitungen und dem Gewindebereich 7 gerundet sind (nur in Fig. 1 oben und in Fig. 2 im Detail dargestellt). Die Durchgangslöcher 5 sind in Inlays 9 ausgebildet, die an ihrem zylindrischen Außenumfang 10 mit dem Grundmaterial 11 des Marknagels 3 verbunden sind. Der Marknagel 3 besteht aus Reintitan, wo bei das Grundmaterial 11 den Härtegrad 3 und die Inlays 9 den Härtegrad 1 haben. Die Inlays 9 sind durch Diffusions schweißen oder Elektronenstrahlschweißen mit dem Grundma terial 11 verbunden.For each locking screw 4 , the intramedullary nail 3 has a through hole 5 , which has funnel-shaped widenings 6 on both sides and a threaded region 7 in the middle, the transitions 8 between the widenings and the threaded region 7 being rounded (only in FIG. 1 above and shown in detail in Fig. 2). The through holes 5 are formed in inlays 9 , which are connected on their cylindrical outer circumference 10 to the base material 11 of the intramedullary nail 3 . The intramedullary nail 3 consists of pure titanium, where the base material 11 has the degree of hardness 3 and the inlays 9 have the degree of hardness 1 . The inlays 9 are connected by diffusion welding or electron beam welding to the basic material 11 .
Die Verriegelungsschrauben 4 sind ebenfalls aus Reintitan mit dem Härtegrad 4 gefertigt und besonders einfach in das weichere Material der Durchgangslöcher 5 eindrehbar. Auf grund der Ausgestaltung der Durchgangslöcher 5 sind sie in verschiedenen Winkelausrichtungen zum Marknagel 3 ein schraubbar. Das ist insbesondere beim Setzen der Verriege lungsschrauben 4 im distalen Bereich mittels eines Zielge rätes von Vorteil. Die Verriegelungsschrauben 4 haben ein durchgehendes Gewinde 12 mit konstanter Steigung, das beim Eindrehen ein Gewinde sowohl in eine Vorbohrung des Kno chens 1 als auch in ein Durchgangsloch 5 des Marknagels 3 formt. Dabei setzt sich die Verriegelungsschraube 4 in Knochen 1 und Marknagel 3 fest, wodurch sich eine beson ders winkel-, aber auch besonders längs- und biegestabile Verbindung ergibt.The locking screws 4 are also made of pure titanium with the degree of hardness 4 and can be screwed particularly easily into the softer material of the through holes 5 . Due to the design of the through holes 5 , they can be screwed in different angular orientations to the intramedullary nail 3 . This is particularly advantageous when setting the locking screws 4 in the distal region by means of a target device. The locking screws 4 have a continuous thread 12 with a constant pitch, which forms a thread when screwed in both in a pilot hole of the bone 1 and in a through hole 5 of the intramedullary nail 3 . The locking screw 4 is fixed in bone 1 and intramedullary nail 3 , which results in a special angular but also particularly longitudinal and bending-stable connection.
Der Außendurchmesser des Gewindes 12 kann zum Einschraub ende der Verriegelungsschrauben 4 hin ansteigen, um das Gewindeformen zu unterstützen.The outer diameter of the thread 12 can increase towards the screw-in end of the locking screws 4 in order to support the thread forming.
Gemäß Fig. 3 ist an einem gebrochenen Röhrenknochen 1 eine Knochenplatte 13 mittels Knochenschrauben 14 fixiert. Die Knochenplatte 13 hat für jede Knochenschraube 14 ein Durchgangsloch 15, das ebenfalls in einem Inlay 16 ausge bildet ist. Das Inlay 16 aus einem verhältnismäßig weichen Reintitan ist an seinem zylindrischen Mantel 17 durch Dif fusionsschweißen mit einem Grundmaterial 18 aus einem här teren Reintitan der Knochenplatte 13 verbunden. Das Durch gangsloch 15 ist zur Außenseite der Knochenplatte 13 hin trichterförmig aufgeweitet. Die Wandstärke des Inlays be trägt oben typischerweise zwischen 1 bis 4 mm, vorzugswei se 2 mm.According to FIG. 3, a bone plate 13 is fixed to a broken tubular bone 1 by means of bone screws 14 . The bone plate 13 has a through hole 15 for each bone screw 14 , which is also formed in an inlay 16 . The inlay 16 made of a relatively soft pure titanium is fusion-welded to its cylindrical jacket 17 by diff with a base material 18 made of a harder pure titanium of the bone plate 13 . The through hole 15 is funnel-shaped towards the outside of the bone plate 13 . The wall thickness of the inlay is typically between 1 to 4 mm, preferably 2 mm above.
Die Knochenschraube 14 hat an ihrem Schaft 19 ein Außenge winde 20 zum Formen eines Gewindes in eine Vorbohrung des Knochens 1. Außerdem hat sie einen Kopf 21 mit einer sphä rischen Unterseite 22, an der ein Schneidgewinde 23 ange ordnet ist. Die Steigung des Gewindes 23 ist kleiner als die des Gewindes 20 und beträgt z. B. 1,4 mm gegenüber 1,8 mm. Es können jedoch auch identische Gewindesteigungen an Kopf 21 und Schaft 19 vorhanden sein. Die Knochen schraube 14 hat denselben Härtegrad wie das Grundmaterial 18 der Knochenplatte 13, beispielsweise den Härtegrad 4. Die Inlays 16 haben typischerweise den Härtegrad 1.The bone screw 14 has on its shaft 19 a Außenge thread 20 for forming a thread in a pilot hole of the bone. 1 In addition, it has a head 21 with a spherical underside 22 on which a cutting thread 23 is arranged. The pitch of the thread 23 is smaller than that of the thread 20 and is z. B. 1.4 mm versus 1.8 mm. However, there may also be identical thread pitches on head 21 and shaft 19 . The bone screw 14 has the same degree of hardness as the base material 18 of the bone plate 13 , for example the degree of hardness 4th The inlays 16 typically have a degree of hardness 1.
Die härtere Knochenschraube 14 läßt sich verhältnismäßig einfach eindrehen, wobei sowohl in den Knochen 1 als auch in das Inlay 16 ein Gewinde geformt wird. Aufgrund der Ge staltung von Durchgangsloch 15 und Schraubenkopf 21 sind verschiedene Winkelausrichtungen der Knochenschraube 14 zur Knochenplatte 13 möglich. Schließlich setzt sich die Knochenschraube 14 in den geschnittenen Gewinden fest. Aufgrund der unterschiedlichen Gewindesteigungen ist dann die Knochenplatte 13 mit dem Knochen 1 verspannt.The harder bone screw 14 can be screwed in relatively easily, a thread being formed both in the bone 1 and in the inlay 16 . Due to the design of through hole 15 and screw head 21 , various angular orientations of the bone screw 14 to the bone plate 13 are possible. Finally, the bone screw 14 settles in the cut threads. Because of the different thread pitches, the bone plate 13 is then clamped to the bone 1 .
Zum weiteren Erleichtern des Eindrehens der Schraube 14 kann das Gewinde im Inlay 16 vorgeformt werden. Hierfür kommt ein Vorformer 24 gemäß Fig. 5 zum Einsatz, der mit einem bolzenförmigen und gewindefreien Abschnitt 25 in das Durchgangsloch 15 und in eine Vorbohrung größeren Durchmes sers des Knochens 1 einführbar ist und der mit einem Vor formgewinde 26 am anderen Ende ein Gewinde in das Inlay 16 vorformt. Danach wird das Gewinde durch Eindrehen der Kno chenschraube 14 fertiggeschnitten.To further facilitate screwing in of the screw 14 , the thread in the inlay 16 can be preformed. For this purpose, a preformer 24 according to FIG. 5 is used, which can be inserted with a bolt-shaped and thread-free section 25 into the through hole 15 and into a pre-drilled hole with a larger diameter of the bone 1 and which has a thread in front of it with a form thread 26 at the other end Inlay 16 preformed. Then the thread is cut by screwing in the bone screw 14 .
Claims (19)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996129011 DE19629011C2 (en) | 1996-07-18 | 1996-07-18 | Tools for osteosynthesis |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE1996129011 DE19629011C2 (en) | 1996-07-18 | 1996-07-18 | Tools for osteosynthesis |
Publications (2)
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DE19629011A1 true DE19629011A1 (en) | 1998-01-22 |
DE19629011C2 DE19629011C2 (en) | 2001-08-23 |
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DE1996129011 Expired - Lifetime DE19629011C2 (en) | 1996-07-18 | 1996-07-18 | Tools for osteosynthesis |
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