EP1624818A1 - Device for aligning a human or animal vertebral column - Google Patents

Device for aligning a human or animal vertebral column

Info

Publication number
EP1624818A1
EP1624818A1 EP04732928A EP04732928A EP1624818A1 EP 1624818 A1 EP1624818 A1 EP 1624818A1 EP 04732928 A EP04732928 A EP 04732928A EP 04732928 A EP04732928 A EP 04732928A EP 1624818 A1 EP1624818 A1 EP 1624818A1
Authority
EP
European Patent Office
Prior art keywords
screw
fixing rod
fastening
fastening element
spine
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.)
Withdrawn
Application number
EP04732928A
Other languages
German (de)
French (fr)
Inventor
Peter Metz-Stavenhagen
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.)
Individual
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
Publication of EP1624818A1 publication Critical patent/EP1624818A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7059—Cortical plates
    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A61B17/7007—Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit around the screw or hook heads
    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/701—Longitudinal elements with a non-circular, e.g. rectangular, cross-section
    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7044—Screws or hooks combined with longitudinal elements which do not contact vertebrae also having plates, staples or washers bearing on the vertebrae
    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A61B17/7005—Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit in the screw or hook heads

Definitions

  • the present invention relates to a device for setting up a human or animal spine with at least two
  • Vertebral body-fixing rod that can be attached to at least two fastening elements that can be anchored to the spine and that can be fastened to the fastening elements by screws or other fastening means
  • Such a device is known from DE 20207847.2, in which fastening elements are attached to the vertebral body, to which one, two or three fixing rods are then attached, which adjust the spine.
  • These fixing rods are designed as threaded rods and can be used either as compression or distraction rods.
  • These threaded rods are locked, for example, on the fastening element in a corresponding fixing rod holder, the fixing rod holder for receiving the fixing rod necessarily being large, so that the fastening element also has a certain size.
  • the present invention is based on the object of creating a device of the type mentioned at the outset which is easier to attach to the spine and which can be made smaller.
  • the invention proposes to further develop the device mentioned at the outset in such a way that elongated holes are formed in the fixing rod in the axial direction, through which the screw or other fastening means for fastening the fixing rod to the fastening element extends.
  • a device designed according to this technical solution has the advantage that, due to the elongated hole, the fixing rod is fastened to the fastening element in a simple manner with a screw which extends through the elongated hole can be. This eliminates the need for an expensive, constructive fixing rod holder that surrounds the fixing rod, so that the entire device can be made much smaller.
  • Another advantage is that by passing the screw through the fixing rod, the latter is held virtually from the inside and the screw no longer protrudes over the fixing rod, so that a smaller size is also achieved.
  • fixation rod when this device is implanted, the fixation rod can be temporarily attached to the spine by gently tightening the screw, and that the spine can then be set up in peace before the screw is finally tightened and the fixation rod finally fixed. This makes it easier to align the spine in the desired position.
  • the fastening element is planar at the location facing the fixing rod, so that a contact surface is defined there.
  • the fastening element can be designed as a flat disk, which contributes to a minimal overall size. Another advantage is that such a fastener is much cheaper to manufacture because it is based on a much simpler construction.
  • the distance between adjacent elongated holes is smaller than the length of the shorter elongated hole. This applies both in the event that the two elongated holes are of different sizes and in the event that both elongated holes are of the same design. This ensures that, seen over the entire length of the fixing rod, a large number of placement options for the screw are made available, so that it is ensured that the fixing rod can be attached to the fastening element in almost any position.
  • the edge of the elongated hole is chamfered or conical, so that, for example, when using countersunk screws, the screw head can be at least partially inserted into the elongated hole, so that no or only small parts of the screw protrude from the fixing rod, which also contributes to a further increase in the overall size.
  • Fig. 1 is a front view of a device according to the invention in
  • FIG. 2 shows a side view of the device according to FIG. 1;
  • FIG. 3 shows a bottom view of a fastening element according to FIG. 1;
  • FIG. 4a shows a plan view of a section of the fixing rod according to FIG. 1; 4b shows a plan view of a second embodiment of the fixing rod;
  • FIG. 7 shows a side view of part of a human spine with a second embodiment of a device according to the invention
  • Fig. 8 is a side view of part of a human spine with a third embodiment of a device according to the invention.
  • FIG. 1 and 2 is an exploded front and side view of an embodiment of an inventive device for fixing a human or animal spine comprising a threaded rod 10, a flat fixing rod 12, a pedicle screw 14, a fastening element 16, a grub screw 18, a screw 20 and a cancellous bone screw 22.
  • the fastening element 16 has a pointed mandrel 24 on its underside 23 facing a vertebral body and that on its
  • Upper side 25 facing away from the vertebral body has a fixing rod holder 26.
  • the head of the pedicle screw 14 is designed as a threaded rod holder 28.
  • the fixing rod 12 is formed from a flat band and has a number of elongated holes 29 and 29 ', as can be seen in detail in FIGS. 4a and 4b.
  • the width of the elongated holes 29, 29 ' is selected so that the screw 20 just fits through.
  • the length of the elongated holes 29, 29 'can vary depending on the application. In any case, however, the elongated holes 29, 29 'are longer than the distance between adjacent elongated holes 29, 29' to one another. In this case, adjacent elongated holes 29, 29 'can have the same length, as shown in FIG. 4a, or different lengths, as shown in FIG. 4b.
  • the fixing rod holder 26 is arranged centrally on the fastening element 16 and extends from one longitudinal edge to the other essentially in the direction of the spine, while the fastening element 16 is oriented essentially transversely to the spine.
  • the fixing rod holder 26 comprises the screw 20, a screw holder 30 and a stop surface 31 provided on the side facing away from the spine for receiving the fixing rod 12.
  • the threaded screw holder 30 for receiving the screw 20 is provided approximately in the middle of the fixing rod holder 26 the fixing rod 12 is fastened in the desired position on the fastening element 16, the fixing rod 12 lying directly on the contact surface 31 in order to reduce the overall height of the fastening element.
  • the screw 20 has a sawtooth thread.
  • saw tooth threads with a slightly larger or slightly smaller thread are also included under a saw tooth thread Flank angle, with a flank angle of 0 ° or a negative flank angle, as well as sawtooth threads according to EP 885598.
  • two screw receptacles 32, 33 are provided diagonally opposite one another at the respective outer ends of the fastening element 16, which are dimensioned such that the shaft of the pedicle screw 14 and the cancellous screw 22 passes through and that the respective one Screw head is precisely fitted in them.
  • more than two screw receptacles are provided in the fastening element in order to obtain more screw-in points.
  • the fastening element is designed with recesses or even in the form of a grid in order to save weight and / or production costs.
  • the fastening element 16 is curved according to the size and shape of the vertebral body, so that the fastening element 16 connects flush to the vertebral body.
  • the highest elevation of the curvature is approximately 6 mm high.
  • FIGS. 6, 7 and 8 show different embodiments of the device according to the invention in a position implanted in the spine, all of which have the same fastening element 16, but are equipped with fixing rods 12, 40, 42 in different ways.
  • the fastening element 16 is attached to a ventral vertebral body 44 by means of one or two screws.
  • the fixation rod 2, 40 can be designed as a rigid but deformable distraction rod or as a compression rod. It goes without saying that the fixing rod holder 26 of the fastening element 16 and the Fixing rod holder 28 of the pedicle screw 14 are designed to match the respective fixing rod 12, 40, 42.
  • a fastening element 16 does not necessarily have to be attached to each vertebral body 44.
  • pedicle screws connected to a fixing rod can also be inserted directly into the vertebral body without a corresponding fastening element, or a vertebral body is skipped.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
  • Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (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)
  • Prostheses (AREA)

Abstract

The invention relates to a device for aligning a human or animal vertebral column. Said device comprises a fixing bar (12, 40, 42), which fixes at least two vertebral bodies (44), can be attached to at least two fastening elements (16) that can be anchored to the vertebral column and can be secured to the fastening elements (16) by screws (20) or other fastening means. Longitudinal cavities (29, 29') are configured in the fixing bar (12, 40, 42) in an axial direction. The screw (20) or other fastening means pass/passes through said cavities in order to fasten the fixing bar (12, 40, 42) to the fastening element (16).

Description

Vorrichtung zum Einrichten einer menschlichen oder tierischen WirbelsäuleDevice for setting up a human or animal spine
Die vorliegende Erfindung betrifft eine Vorrichtung zum Einrichten einer menschlichen oder tierischen Wirbelsäule mit einem mindestens zweiThe present invention relates to a device for setting up a human or animal spine with at least two
Wirbelkörper fixierenden Fixierstab, der an mindestens zwei an der Wirbelsäule verankerbare Befestigungselemente anbringbar ist und durch Schrauben oder andere Befestigungsmittel an den Befestigungselementen befestigbar ist,Vertebral body-fixing rod that can be attached to at least two fastening elements that can be anchored to the spine and that can be fastened to the fastening elements by screws or other fastening means,
Aus dem DE 20207847.2 ist eine solche Vorrichtung bekannt, bei der am Wirbelkörper Befestigungselemente angebracht werden, an welche dann ein, zwei oder drei Fixierstäbe angebracht werden, welche die Wirbelsäule justieren. Diese Fixierstäbe sind als Gewindestäbe ausgeführt und können wahlweise als Kompressions- oder Distraktionsstab eingesetzt werden. Diese Gewindestäbe sind beispielsweise an dem Befestigungselement in einer entsprechenden Fixierstabhalterung arretiert, wobei die Fixierstabhalterung zur Aufnahme des Fixierstabes zwangsweise groß ausgeführt, so dass auch das Befestigungselement eine gewisse Baugröße aufweist.Such a device is known from DE 20207847.2, in which fastening elements are attached to the vertebral body, to which one, two or three fixing rods are then attached, which adjust the spine. These fixing rods are designed as threaded rods and can be used either as compression or distraction rods. These threaded rods are locked, for example, on the fastening element in a corresponding fixing rod holder, the fixing rod holder for receiving the fixing rod necessarily being large, so that the fastening element also has a certain size.
Davon ausgehend liegt der vorliegenden Erfindung die Aufgabe zu Grunde, eine Vorrichtung der eingangs genannten Art zu schaffen, die einfacher an der Wirbelsäule anzubringen ist und die kleiner ausgeführt werden kann.Proceeding from this, the present invention is based on the object of creating a device of the type mentioned at the outset which is easier to attach to the spine and which can be made smaller.
Als technische Lösung dieser Aufgabe wird erfindungsgemäß vorgeschlagen, die eingangs genannte Vorrichtung dahingehend weiterzubilden, dass im Fixierstab in axialer Richtung Langlöcher ausgebildet sind durch die die Schraube oder das andere Befestigungsmittel zur Befestigung des Fixierstabes am Befestigungselement hindurch reicht.As a technical solution to this problem, the invention proposes to further develop the device mentioned at the outset in such a way that elongated holes are formed in the fixing rod in the axial direction, through which the screw or other fastening means for fastening the fixing rod to the fastening element extends.
Eine nach dieser technischen Lösung ausgebildete Vorrichtung hat den Vorteil, dass aufgrund des Langloches der Fixierstab in einfacher Weise mit einer durch das Langloch hindurchreichenden Schraube am Befestigungselement befestigt werden kann. Somit entfällt eine aufwendige, konstruktive und den Fixierstab umgreifende Fixierstabhalterung, so dass die gesamte Vorrichtung sehr viel kleiner ausgeführt werden kann.A device designed according to this technical solution has the advantage that, due to the elongated hole, the fixing rod is fastened to the fastening element in a simple manner with a screw which extends through the elongated hole can be. This eliminates the need for an expensive, constructive fixing rod holder that surrounds the fixing rod, so that the entire device can be made much smaller.
Ein weiterer Vorteil besteht darin, dass durch das Hindurchführen der Schraube durch den Fixierstab dieser quasi von innen gehalten wird und die Schraube nun nicht länger über den Fixierstab hinübersteht, so dass auch hierdurch eine geringere Baugröße erreicht wird.Another advantage is that by passing the screw through the fixing rod, the latter is held virtually from the inside and the screw no longer protrudes over the fixing rod, so that a smaller size is also achieved.
Noch ein weiterer Vorteil besteht darin, dass bei der Implantation dieser Vorrichtung der Fixierstab zunächst einmal durch leichtes Andrehen der Schraube provisorisch an der Wirbelsäule angebracht werden kann und dass dann die Wirbelsäule in Ruhe eingerichtet werden kann, bevor die Schraube endgültig festgezogen wird und den Fixierstab endgültig fixiert. Dies erleichtert das Ausrichten der Wirbelsäule in der gewünschten Stellung.Yet another advantage is that when this device is implanted, the fixation rod can be temporarily attached to the spine by gently tightening the screw, and that the spine can then be set up in peace before the screw is finally tightened and the fixation rod finally fixed. This makes it easier to align the spine in the desired position.
In einer bevorzugten Ausführungsform ist das Befestigungselement an der dem Fixierstab zugewandten Stelle plan ausgebildet, so dass dort eine Anlagefläche definiert ist. Durch diese plane Ausführung kann das Befestigungselement als flache Scheibe ausgeführt werden, was zu einer minimalen Baugröße beiträgt. Ein weiterer Vorteil besteht darin, dass ein solches Befestigungselement viel kostengünstiger herzustellen ist, da es auf einer sehr viel einfacheren Konstruktion beruht.In a preferred embodiment, the fastening element is planar at the location facing the fixing rod, so that a contact surface is defined there. With this flat design, the fastening element can be designed as a flat disk, which contributes to a minimal overall size. Another advantage is that such a fastener is much cheaper to manufacture because it is based on a much simpler construction.
In einer anderen, bevorzugten Ausführungsform ist der Abstand benachbarter Langlöcher kleiner als die Länge des kürzeren Langloches. Dies gilt sowohl für den Fall, dass beide Langlöcher unterschiedlich groß sind, als auch für den Fall, dass beide Langlöcher gleich ausgebildet sind. Hierdurch wird erreicht, dass über der Gesamtlänge des Fixierstabes gesehen eine Vielzahl von Platzierungsmöglichkeiten für die Schraube zur Verfügung gestellt werden, so dass sichergestellt ist, dass der Fixierstab in annähernd jeder Position an dem Befestigungselement anbringbar ist. In einer besonders bevorzugten Ausführungsform ist die Kante des Langloches angefast oder konisch ausgebildet, so dass zum Beispiel bei Verwendung von Senkopfschrauben der Schraubenkopf zumindest teilweise in das Langloch eingelassen werden kann, so dass keine oder nur geringe Teile der Schraube aus dem Fixierstab herausragen, was ebenfalls zu einer weiteren Erhöhung der gesamten Baugröße beiträgt.In another preferred embodiment, the distance between adjacent elongated holes is smaller than the length of the shorter elongated hole. This applies both in the event that the two elongated holes are of different sizes and in the event that both elongated holes are of the same design. This ensures that, seen over the entire length of the fixing rod, a large number of placement options for the screw are made available, so that it is ensured that the fixing rod can be attached to the fastening element in almost any position. In a particularly preferred embodiment, the edge of the elongated hole is chamfered or conical, so that, for example, when using countersunk screws, the screw head can be at least partially inserted into the elongated hole, so that no or only small parts of the screw protrude from the fixing rod, which also contributes to a further increase in the overall size.
Weitere Vorteile der erfindungsgemäßen Vorrichtung ergeben sich aus der beigefügten Zeichnung und den nachstehend beschriebenen Ausführungsformen. Ebenso können die vorstehend genannten und die noch weiter ausgeführten Merkmale erfindungsgemäß jeweils einzeln oder in beliebigen Kombinationen miteinander verwendet werden. Die erwähnten Ausführungsformen sind nicht als abschließende Aufzählung zu verstehen, sondern haben vielmehr beispielhaften Charakter. Es zeigen:Further advantages of the device according to the invention result from the attached drawing and the embodiments described below. Likewise, according to the invention, the features mentioned above and those which are explained further can be used individually or in any combination with one another. The mentioned embodiments are not to be understood as an exhaustive list, but rather have an exemplary character. Show it:
Fig. 1 eine Frontansicht einer erfindungsgemäßen Vorrichtung inFig. 1 is a front view of a device according to the invention in
Explosionsdarstellung; Fig. 2 eine Seitenansicht der Vorrichtung gemäß Fig. 1 ; Fig. 3 eine Unteransicht eines Befestigungselementes gemäß Fig. 1 ;Exploded view; FIG. 2 shows a side view of the device according to FIG. 1; FIG. 3 shows a bottom view of a fastening element according to FIG. 1;
Fig. 4a eine Draufsicht auf einen Ausschnitt des Fixierstabes gemäß Fig. 1 ; Fig. 4b eine Draufsicht auf eine zweite Ausführungsform des Fixierstabes; Fig. 5 eine Draufsicht auf das Befestigungselement gemäß Fig. 3; Fig. 6 eine Seitenansicht eines Teils einer menschlichen Wirbelsäule mit einer ersten Ausführungsform einer erfindungsgemäßen Vorrichtung;4a shows a plan view of a section of the fixing rod according to FIG. 1; 4b shows a plan view of a second embodiment of the fixing rod; FIG. 5 shows a plan view of the fastening element according to FIG. 3; 6 shows a side view of part of a human spine with a first embodiment of a device according to the invention;
Fig. 7 eine Seitenansicht eines Teils einer menschlichen Wirbelsäule mit einer zweiten Ausführungsform einer erfindungsgemäßen Vorrichtung; Fig. 8 eine Seitenansicht eines Teils einer menschlichen Wirbelsäule mit einer dritten Ausführungsform einer erfindungsgemäßen Vorrichtung.7 shows a side view of part of a human spine with a second embodiment of a device according to the invention; Fig. 8 is a side view of part of a human spine with a third embodiment of a device according to the invention.
In den Figuren 1 und 2 ist in explosionsartiger Front- und Seitenansicht eine Ausführungsform einer erfindungsgemäßen Vorrichtung zur Fixierung einer menschlichen oder tierischen Wirbelsäule umfassend einen Gewindestab 10, einen flachen Fixierstab 12, eine Pedikelschraube 14, ein Befestigungselement 16, eine Madenschraube 18, eine Schraube 20 und eine Spongiosaschraube 22 dargestellt. Das Befestigungselement 16 weist auf seiner einem Wirbelkörper zugewandten Unterseite 23 einen spitzen Dorn 24 und auf seiner demIn Figures 1 and 2 is an exploded front and side view of an embodiment of an inventive device for fixing a human or animal spine comprising a threaded rod 10, a flat fixing rod 12, a pedicle screw 14, a fastening element 16, a grub screw 18, a screw 20 and a cancellous bone screw 22. The fastening element 16 has a pointed mandrel 24 on its underside 23 facing a vertebral body and that on its
Wirbelkörper abgewandten Oberseite 25 eine Fixierstabhalterung 26 auf. Der Kopf der Pedikelschraube 14 ist als Gewindestabhalterung 28 ausgebildet.Upper side 25 facing away from the vertebral body has a fixing rod holder 26. The head of the pedicle screw 14 is designed as a threaded rod holder 28.
Der Fixierstab 12 ist aus einem flachen Band gebildet und weist eine Anzahl Langlöcher 29 und 29' auf, wie detailliert Fig. 4a und 4b zu entnehmen ist. Die Breite der Langlöcher 29, 29' ist so gewählt, dass gerade eben die Schraube 20 hindurchpasst. Die Länge der Langlöcher 29, 29' kann je nach Anwendungsfall variieren. In jedem Fall jedoch sind die Langlöcher 29, 29' länger als der Abstand benachbarter Langlöcher 29, 29' zueinander. Dabei können benachbarte Langlöcher 29, 29' gleichlang sein, wie in Fig. 4a dargestellt ist, oder unterschiedlich lang sein, wie in Fig. 4b dargestellt ist.The fixing rod 12 is formed from a flat band and has a number of elongated holes 29 and 29 ', as can be seen in detail in FIGS. 4a and 4b. The width of the elongated holes 29, 29 'is selected so that the screw 20 just fits through. The length of the elongated holes 29, 29 'can vary depending on the application. In any case, however, the elongated holes 29, 29 'are longer than the distance between adjacent elongated holes 29, 29' to one another. In this case, adjacent elongated holes 29, 29 'can have the same length, as shown in FIG. 4a, or different lengths, as shown in FIG. 4b.
Die Fixierstabhalterung 26 ist mittig auf dem Befestigungselement 16 angeordnet und erstreckt sich von einem Längsrand zum anderen im wesentlichen in Richtung der Wirbelsäule, während das Befestigungselement 16 im wesentlichen quer zur Wirbelsäule ausgerichtet ist. Die Fixierstabhalterung 26 umfasst die Schraube 20, eine Schraubenaufnahme 30 und eine auf der der Wirbelsäule abgewandten Seite vorgesehene Anschlagfläche 31 zur Aufnahme des Fixierstabes 12. Etwa in der Mitte der Fixierstabhalterung 26 ist die ein Gewinde aufweisende Schraubenaufnahme 30 zur Aufnahme der Schraube 20 vorgesehen, mit der der Fixierstab 12 in der gewünschten Stellung am Befestigungselement 16 befestigt wird, wobei der Fixierstab 12 dabei direkt auf der Anlagefläche 31 aufliegt, um die Bauhöhe des Befestigungselementes zu reduzieren. Die Schraube 20 weist ein Sägezahngewinde auf. Unter einem Sägezahngewinde sind neben dem metrischen Sägegewinde gemäß DIN 513 auch Sägezahngewinde mit einem etwas größeren oder etwas kleineren Flankenwinkel, mit einem Flankenwinkel von 0° oder einem negativen Flankenwinkel, sowie Sägezahngewinde gemäß EP 885598 zu verstehen.The fixing rod holder 26 is arranged centrally on the fastening element 16 and extends from one longitudinal edge to the other essentially in the direction of the spine, while the fastening element 16 is oriented essentially transversely to the spine. The fixing rod holder 26 comprises the screw 20, a screw holder 30 and a stop surface 31 provided on the side facing away from the spine for receiving the fixing rod 12. The threaded screw holder 30 for receiving the screw 20 is provided approximately in the middle of the fixing rod holder 26 the fixing rod 12 is fastened in the desired position on the fastening element 16, the fixing rod 12 lying directly on the contact surface 31 in order to reduce the overall height of the fastening element. The screw 20 has a sawtooth thread. In addition to the metric saw thread according to DIN 513, saw tooth threads with a slightly larger or slightly smaller thread are also included under a saw tooth thread Flank angle, with a flank angle of 0 ° or a negative flank angle, as well as sawtooth threads according to EP 885598.
Wie den Figuren 3 und 5 zu entnehmen ist, sind an den jeweils äußeren Enden des Befestigungselementes 16 zwei Schraubenaufnahmen 32, 33 sich diagonal gegenüberliegend vorgesehen, die so dimensioniert sind, dass der Schaft der Pedikel- 14 und der Spongiosaschraube 22 hindurchgelangt und dass der jeweilige Schraubenkopf passgenau in ihnen aufgenommen wird.As can be seen from FIGS. 3 and 5, two screw receptacles 32, 33 are provided diagonally opposite one another at the respective outer ends of the fastening element 16, which are dimensioned such that the shaft of the pedicle screw 14 and the cancellous screw 22 passes through and that the respective one Screw head is precisely fitted in them.
In einer anderen, hier nicht dargestellten Ausführungsform sind in dem Befestigungselement mehr als zwei Schraubenaufnahmen vorgesehen, um mehr Einschraubpunkte zu erhalten. In noch einer anderen, hier nicht dargestellten Ausführungsform ist das Befestigungselement mit Aussparungen oder gar gitterförmig ausgeführt, um Gewicht und/oder Fertigungskosten einzusparen.In another embodiment, not shown here, more than two screw receptacles are provided in the fastening element in order to obtain more screw-in points. In yet another embodiment, not shown here, the fastening element is designed with recesses or even in the form of a grid in order to save weight and / or production costs.
Das Befestigungselement 16 ist entsprechend der Größe und Form des Wirbelkörpers gewölbt ausgebildet, damit sich das Befestigungselement 16 bündig an den Wirbelkörper anschließt. Bei dem hier dargestellten, circa 1 ,5 mm dicken Befestigungselement 16 ist die höchste Erhebung der Wölbung circa 6 mm hoch.The fastening element 16 is curved according to the size and shape of the vertebral body, so that the fastening element 16 connects flush to the vertebral body. In the fastening element 16 shown here, which is approximately 1.5 mm thick, the highest elevation of the curvature is approximately 6 mm high.
In den Figuren 6, 7 und 8 sind verschiedene Ausführungsformen der erfindungsgemäßen Vorrichtung in einer in die Wirbelsäule implantierten Position dargestellt, die alle über das gleiche Befestigungselement 16 verfügen, jedoch in unterschiedlicher Art und Weise mit Fixierstäben 12, 40, 42 bestückt sind. Das Befestigungselement 16 wird dabei mittels einer oder zwei Schrauben an einem ventralen Wirbelkörper 44 angebracht. Der Fixierstab 2, 40 kann je nach medizinischer Situation als eine starrer, jedoch verformbarer Distraktionsstab oder als ein Kompressionsstab ausgebildet sein. Es versteht sich, dass die Fixierstabhalterung 26 des Befestigungselementes 16 und die Fixierstabhalterung 28 der Pedikelschraube 14 passend zu dem jeweiligen Fixierstab 12, 40, 42 ausgebildet sind.FIGS. 6, 7 and 8 show different embodiments of the device according to the invention in a position implanted in the spine, all of which have the same fastening element 16, but are equipped with fixing rods 12, 40, 42 in different ways. The fastening element 16 is attached to a ventral vertebral body 44 by means of one or two screws. Depending on the medical situation, the fixation rod 2, 40 can be designed as a rigid but deformable distraction rod or as a compression rod. It goes without saying that the fixing rod holder 26 of the fastening element 16 and the Fixing rod holder 28 of the pedicle screw 14 are designed to match the respective fixing rod 12, 40, 42.
Es versteht sich auch, dass nicht notwendigerweise an jedem Wirbelkörper 44 ein Befestigungselement 16 angebracht sein muß. Je nach Situation können auch mit einem Fixierstab verbundene Pedikelschrauben ohne ein entsprechendes Befestigungselement direkt in den Wirbelkörper eingelassen sein oder ein Wirbelkörper wird übersprungen. It is also understood that a fastening element 16 does not necessarily have to be attached to each vertebral body 44. Depending on the situation, pedicle screws connected to a fixing rod can also be inserted directly into the vertebral body without a corresponding fastening element, or a vertebral body is skipped.
Bezugszeichenliste.'REFERENCE LIST. '
10 Gewindestab10 threaded rod
12 Fixierstab12 fixing rod
14 Pedikelschraube14 pedicle screw
16 Befestigungselement16 fastener
18 Madenschraube18 grub screw
20 Schraube20 screw
22 Spongiosaschraube22 Cancellous screw
23 Unterseite23 bottom
24 Dorn24 thorn
25 Oberseite25 top
26 Fixierstabhalterung26 Fixation rod holder
28 Gewindestabhalterung28 threaded rod holder
29, 29' Langloch29, 29 'slot
30 Schraubenaufnahme30 screw holder
31 Anschlagfläche31 stop surface
32 Schraubenaufnahme32 screw holder
33 Schraubenaufnahme33 screw holder
34 Ebene34 level
36 Ebene36 level
40 Fixierstab40 fixing rod
41 starrer Fixierstab41 rigid fixing rod
42 Space42 space
44 Wirbelkörper 44 vertebrae

Claims

Ansprüche: Expectations:
1. Vorrichtung zum Einrichten einer menschlichen oder tierischen Wirbelsäule mit einem mindestens zwei Wirbelkörper (44) fixierenden Fixierstab (12, 40,1. Device for setting up a human or animal spine with an at least two vertebral body (44) fixing fixation rod (12, 40,
42), der an mindestens zwei an der Wirbelsäule verankerbare Befestigungselemente (16) anbringbar ist und durch Schrauben (20) oder andere Befestigungsmittel an den Befestigungselementen (16) befestigbar ist, dadurch gekennzeichnet, dass im Fixierstab (12, 40, 42) in axialer Richtung Langlöcher (29, 29') ausgebildet sind durch die die Schraube (20) oder das andere Befestigungsmittel zur Befestigung des Fixierstabes (12, 40, 42) am Befestigungselement (16) hindurch reicht.42), which can be attached to at least two fastening elements (16) that can be anchored to the spine and can be fastened to the fastening elements (16) by screws (20) or other fastening means, characterized in that in the fixing rod (12, 40, 42) in an axial direction Longitudinal holes (29, 29 ') are formed through which the screw (20) or the other fastening means for fastening the fixing rod (12, 40, 42) on the fastening element (16) extends.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der Abstand benachbarter Langlöcher (29, 29') zueinander kleiner ist, als die Länge des kürzeren Langloches (29, 29').2. Device according to claim 1, characterized in that the distance between adjacent elongated holes (29, 29 ') is smaller than the length of the shorter elongated hole (29, 29').
3. Vorrichtung nach wenigstens einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass zwei benachbarte Langlöcher (29, 29') gleich lang sind.3. Device according to at least one of the preceding claims, characterized in that two adjacent elongated holes (29, 29 ') are of equal length.
4. Vorrichtung nach wenigstens einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Langloch (29, 29') entsprechend der Form der Schraube (20) oder des anderen Befestigungsmittels angefast ist.4. The device according to at least one of the preceding claims, characterized in that the elongated hole (29, 29 ') is chamfered according to the shape of the screw (20) or the other fastening means.
5. Vorrichtung nach wenigstens einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Befestigungselement (16) auf seiner der Wirbelsäule abgewandten Seite eine plane Anlagefläche (31) aufweist, an der der Fixierstab (12, 40, 42) anlegbar ist. 5. The device according to at least one of the preceding claims, characterized in that the fastening element (16) on its side facing away from the spine has a flat contact surface (31) on which the fixing rod (12, 40, 42) can be applied.
EP04732928A 2003-05-19 2004-05-14 Device for aligning a human or animal vertebral column Withdrawn EP1624818A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20307773U DE20307773U1 (en) 2003-05-19 2003-05-19 Device for setting up a human or animal spine
PCT/DE2004/001005 WO2004103192A1 (en) 2003-05-19 2004-05-14 Device for aligning a human or animal vertebral column

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EP1624818A1 true EP1624818A1 (en) 2006-02-15

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US (1) US20070173816A1 (en)
EP (1) EP1624818A1 (en)
DE (2) DE20307773U1 (en)
WO (1) WO2004103192A1 (en)

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WO2004103192A1 (en) 2004-12-02
DE20307773U1 (en) 2004-09-23
US20070173816A1 (en) 2007-07-26
DE112004001356D2 (en) 2006-04-06

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