EP2323592A1 - Implant for insertion between vertebral bodies of the spinal column - Google Patents

Implant for insertion between vertebral bodies of the spinal column

Info

Publication number
EP2323592A1
EP2323592A1 EP08874923A EP08874923A EP2323592A1 EP 2323592 A1 EP2323592 A1 EP 2323592A1 EP 08874923 A EP08874923 A EP 08874923A EP 08874923 A EP08874923 A EP 08874923A EP 2323592 A1 EP2323592 A1 EP 2323592A1
Authority
EP
European Patent Office
Prior art keywords
implant
plate
circular
extensions
basic shape
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Withdrawn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
EP08874923A
Other languages
German (de)
French (fr)
Inventor
Nelli Wiedenbeck
Stefan Breuer
Sven Hamich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ulrich GmbH and Co KG
Original Assignee
Ulrich GmbH and Co KG
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 Ulrich GmbH and Co KG filed Critical Ulrich GmbH and Co KG
Publication of EP2323592A1 publication Critical patent/EP2323592A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30721—Accessories
    • A61F2/30744—End caps, e.g. for closing an endoprosthetic cavity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30113—Rounded shapes, e.g. with rounded corners circular
    • A61F2002/3012—Rounded shapes, e.g. with rounded corners circular intersecting circles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30495—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a locking ring
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
    • A61F2002/3055—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting length
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30601—Special structural features of bone or joint prostheses not otherwise provided for telescopic
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
    • A61F2002/30616—Sets comprising a plurality of prosthetic parts of different sizes or orientations
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0006—Rounded shapes, e.g. with rounded corners circular

Definitions

  • the invention relates to an implant for insertion between the vertebral body of the spine as a placeholder for removed from the spine intervertebral discs, vertebrae or vertebrae, with a first implant part and a second implant part, which are mutually adjustable in the direction of their coaxial longitudinal axes to change the length of the implant.
  • Such an implant is known, for example, from DE 103 11 477 A1, which has proven itself well in practice and is characterized by its own excellent promotion of the formation of a bony connection between the vertebral bodies with an individual adaptability of the implant to the conditions present in situ , which is achieved by a first and a second implant part in the direction of their coaxial longitudinal axes are adjustable and a lug plate on at least one free end by means for releasably attachable attachable.
  • the invention is therefore based on the object, an implant of the type mentioned in such a way that when using the implant for extreme load conditions improved protection of the vertebral body can be achieved.
  • the lug plate has a circular basic shape and that the circular basic shape is modified at the periphery by substantially circular plate extensions with different diameters and / or different degree of overlap with the circular basic shape.
  • this implant has the advantage that with the superposition of the circular plate extensions by the circular design better load distribution in situ on particularly resilient areas of the base plates and the cover plates of the vertebral body is achieved without unnecessarily increasing the degree of coverage over the approach plate and thereby to hinder the ingrowth of the bone material into the implant.
  • the edge regions of the base plates or the cover plates of the vertebral bodies have an increased strength compared with the inner regions of the base plates or the cover plates of the vertebral bodies, so that a stronger load bearing at the edge regions is more gentle for the vertebral bodies.
  • the circular plate extensions comprise a subset of circular plate extensions having a widened neck portion to the circular basic shape. This allows a better load bearing on the edge areas.
  • the circular plate extensions with the widened neck portion can extend from the widened neck portion to the peripheral surface in the Rejuvenate height so that a wedge-shaped cross-section can be achieved.
  • the circular basic shape preferably has an inner ring and the superpositions of the essentially circular plate extensions form an outer, correspondingly modified ring.
  • the advantage of this embodiment is that, in particular, the opening in the middle of the attachment plate promotes the formation of a bony connection between the vertebral bodies.
  • the circular plate extensions are arranged at least partially in ascending size or decreasing size along the peripheral surface of the attachment plate.
  • This modification of the lug plate allows a more appropriate distribution of the pressure surface without the need to increase the area of the lug plate so that the desired promotion of the formation of a bony connection for this implant is maintained.
  • the lug plate has at its border a convex base surface over an angle of 80 ° to 120 °.
  • the attachment plate may have at its border a concave end face over an angle of 5 ° to 40 °. It is expedient for the implant, if the
  • Bump plate is designed mirror-symmetrically with an axis of symmetry from the center of the concave end face to the center of the convex base surface.
  • the load behavior is particularly well met when the circular plate extensions are arranged from the convex base surface to the concave face of increasing size.
  • the present invention relates to a lug plate for an implant according to one of the preceding aspects.
  • Fig. 1 is a perspective view of one of a first
  • Implant part and a second implant part existing implant with a lug plate according to the present invention
  • Fig. 3 is an isolated, perspective view of an upper side of an upper lug plate according to the present invention
  • Fig. 4 is an isolated, perspective view of a bottom of an upper attachment plate according to the present invention.
  • an implant 1 which serves for insertion between the vertebral bodies of the spine, not shown in the drawing itself as a placeholder for removed from the spine intervertebral discs, vertebrae or vertebrae.
  • the implant 1 comprises a first implant part 2 and a second implant part 3, which are adjustable in the direction of their coaxial longitudinal axes to change the length of the implant 1 against each other. The change in length can z. B. via a second implant part 3 associated rotatable threaded ring 4 are performed.
  • the implant 1 further has at least one, in the embodiment shown, an upper attachment plate 5a and a lower attachment plate 5b, which can be exchanged at the free ends of the two implant parts 2, 3 in a direction substantially perpendicular to the longitudinal axis of the implant 1 by means for detachable attachment are connected, wherein the upper lug plate 5a and the lower lug plate 5b may be configured differently to adapt to the shape of the base plate of the vertebral body or to the shape of the cover plate of the vertebral body.
  • Figures 3 and 4 show an isolated perspective view of a top and a bottom of an upper lug plate 5a according to the present invention.
  • the upper lug plate 5a has a circular basic shape 8, the peripheral surface of which is modified by superpositions of substantially circular first plate extensions 9 and second plate extensions 10.
  • the second plate extension 10 has a larger diameter than the first plate extension 9 and the first plate extension 9 and the second plate extension 10 may be in the Degree of overlap with the circular basic shape 8 of the upper approach plate 5a differ.
  • the circular basic shape 8 may comprise an inner ring with an opening 13.
  • the superpositions of the first plate extension 9 and the second plate extension 10 form an outer, correspondingly modified ring, in which an outer part of the second plate extension 10 protrudes beyond the outer ring.
  • the second plate extension 10 may have a widened neck portion and taper in height from the widened neck portion to the skirting surface, so that a wedge-shaped
  • Cross-section is formed, which protrudes at its tip over the outer ring.
  • the upper lug plate 5a has a convex base surface 11 over an angle of 80 ° to 120 °. Opposite the base surface 11, a concave end face 12 is arranged over an angle of 5 ° to 40 °.
  • the upper lug plate 5a is designed mirror-symmetrically with an axis of symmetry from the center of the concave end face 12 to the center of the convex base surface 11.
  • the first and the second plate extensions 9, 10 may be arranged on the border of the attachment plate 5a in ascending size from the convex base surface 11 to the concave end face 12.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Neurology (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

An implant (1) for insertion between vertebral bodies of the spinal column as a spacer for intervertebral disks removed from the spinal column, vertebrae, or vertebrae portions, comprises a first implant part (2) and a second implant part (3), which can be displaced relative to each other in the direction of the coaxial longitudinal axes thereof for changing the length of the implant (1), and further comprises an attachment plate (5a, 5b), which can be connected at the free end of at least one of the two implant parts (2, 3) in an orientation that is substantially perpendicular to the longitudinal axis using means for detachable fastening. The attachment plate (5a, 5b) has a basic circular shape (8), wherein the basic circular shape (8) is modified at the circumference by superpositions of substantially circular plate extensions (9, 10) having different diameters and/or different degrees of overlap with the basic circular shape (8).

Description

Implantat zum Einsetzen zwischen Wirbelkörper der Wirbelsäule Implant for insertion between vertebral bodies of the spine
Die Erfindung betrifft ein Implantat zum Einsetzen zwischen Wirbelkörper der Wirbelsäule als Platzhalter für aus der Wirbelsäule entfernte Bandscheiben, Wirbel oder Wirbelteile, mit einem ersten Implantatteil und einem zweiten Implantatteil, die in Richtung ihrer koaxialen Längsachsen zur Längenänderung des Implantats gegeneinander verstellbar sind.The invention relates to an implant for insertion between the vertebral body of the spine as a placeholder for removed from the spine intervertebral discs, vertebrae or vertebrae, with a first implant part and a second implant part, which are mutually adjustable in the direction of their coaxial longitudinal axes to change the length of the implant.
Ein derartiges Implantat ist beispielsweise aus der DE 103 11 477 A1 bekannt, das sich in der Praxis gut bewährt hat und durch die ihm eigene hervorragende Förderung der Ausbildung einer knöchernen Verbindung zwischen den Wirbelkörpern mit einer individuellen Anpassbarkeit des Implantats an die in situ vorliegenden Gegebenheiten auszeichnet, die erreicht wird, indem ein erstes und ein zweites Implantatteil in Richtung ihrer koaxialen Längsachsen verstellbar sind und eine Ansatzplatte an mindestens einem freien Ende durch Mittel zur lösbaren Befestigung anbringbar ist.Such an implant is known, for example, from DE 103 11 477 A1, which has proven itself well in practice and is characterized by its own excellent promotion of the formation of a bony connection between the vertebral bodies with an individual adaptability of the implant to the conditions present in situ , which is achieved by a first and a second implant part in the direction of their coaxial longitudinal axes are adjustable and a lug plate on at least one free end by means for releasably attachable attachable.
In ihrem Bestreben dieses bewährte Implantat für den Einsatz unterIn their endeavor, this proven implant for use under
Extrembelastungsbedingungen der Wirbelsäule weiterzuentwickeln, haben die Anmelder die Interaktionen zwischen dieser Ansatzplatte des Implantats und einer Grundplatte eines Wirbelkörpers bzw. einer Deckplatte eines Wirbelkörpers eingehenden Untersuchungen unterzogen, wobei besondere Abhängigkeiten der Belastbarkeit der Grundplatte eines Wirbelkörpers bzw. der Deckplatte eines Wirbelkörpers festgestellt werden konnten.Have to develop extreme load conditions of the spine the applicants subjected the interactions between this approach plate of the implant and a base plate of a vertebral body or a cover plate of a vertebral body thorough investigations, with particular dependencies of the load capacity of the base plate of a vertebral body or the cover plate of a vertebral body could be determined.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Implantat der eingangs genannten Art so auszubilden, dass bei Einsatz des Implantates für Extrembelastungsbedingungen eine verbesserte Schonung der Wirbelkörper erreicht werden kann.The invention is therefore based on the object, an implant of the type mentioned in such a way that when using the implant for extreme load conditions improved protection of the vertebral body can be achieved.
Diese Aufgabe wird bei dem eingangs genannten Implantat dadurch gelöst, dass die Ansatzplatte eine kreisförmige Grundform aufweist und dass die kreisförmige Grundform am Umfang durch von im Wesentlichen kreisförmigen Plattenextensionen mit unterschiedlichen Durchmessern und / oder unterschiedlichen Überlappungsgrad mit der kreisförmigen Grundform modifiziert ist. Mit diesem Implantat ist der Vorteil verbunden, dass mit der Superposition der kreisförmigen Plattenextensionen durch die kreisförmige Ausgestaltung eine bessere Lastverteilung in situ auf besonders belastbare Bereiche der Grundplatten bzw. der Deckplatten der Wirbelkörper erreicht wird, ohne den Abdeckungsgrad über die Ansatzplatte unnötig zu steigern und dadurch das Einwachsen des Knochenmaterials in das Implantat zu behindern. Insbesondere die Randbereiche der Grundplatten bzw. der Deckplatten der Wirbelkörper weisen gegenüber den Innenbereichen der Grundplatten bzw. der Deckplatten der Wirbelkörper eine erhöhte Festigkeit auf, so dass eine stärkere Lastaufnahme an den Randbereichen für die Wirbelkörper schonender ist. Aus diesen Gründen ist es besonders vorteilhaft, wenn die kreisförmigen Plattenextensionen eine Teilmenge an kreisförmigen Plattenextensionen umfassen, die einen verbreiterten Halsabschnitt zu der kreisförmigen Grundform aufweisen. Dadurch wird eine bessere Lastaufnahme an den Randbereichen ermöglicht.This object is achieved in the implant mentioned above in that the lug plate has a circular basic shape and that the circular basic shape is modified at the periphery by substantially circular plate extensions with different diameters and / or different degree of overlap with the circular basic shape. With this implant has the advantage that with the superposition of the circular plate extensions by the circular design better load distribution in situ on particularly resilient areas of the base plates and the cover plates of the vertebral body is achieved without unnecessarily increasing the degree of coverage over the approach plate and thereby to hinder the ingrowth of the bone material into the implant. In particular, the edge regions of the base plates or the cover plates of the vertebral bodies have an increased strength compared with the inner regions of the base plates or the cover plates of the vertebral bodies, so that a stronger load bearing at the edge regions is more gentle for the vertebral bodies. For these reasons, it is particularly advantageous if the circular plate extensions comprise a subset of circular plate extensions having a widened neck portion to the circular basic shape. This allows a better load bearing on the edge areas.
Um eine weitergehende Anpassung des Implantats an die Gestalt der Grundplatte bzw. der Deckplatte des Wirbelkörpers und eine schonendere Druckbelastung der Grundplatte bzw. der Deckplatte des Wirbelkörpers zu ermöglichen, können die kreisförmigen Plattenextensionen mit den verbreiterten Halsabschnitt sich von dem verbreiterten Halsabschnitt zu der Umrandungsfläche in der Höhe verjüngen, so dass ein keilförmiger Querschnitt erreicht werden kann.In order to allow a further adaptation of the implant to the shape of the base plate or the cover plate of the vertebral body and a gentler compressive load of the base plate or the cover plate of the vertebral body, the circular plate extensions with the widened neck portion can extend from the widened neck portion to the peripheral surface in the Rejuvenate height so that a wedge-shaped cross-section can be achieved.
Bevorzugt weist bei dem Implantat die kreisförmige Grundform einen inneren Ring auf und bilden die Superpositionen der im Wesentlichen kreisförmigen Plattenextensionen einen äußeren, entsprechend modifizierten Ring. EinIn the case of the implant, the circular basic shape preferably has an inner ring and the superpositions of the essentially circular plate extensions form an outer, correspondingly modified ring. One
Vorteil dieser Ausgestaltung liegt darin, dass insbesondere die Öffnung in der Mitte der Ansatzplatte die Ausbildung einer knöchernen Verbindung zwischen den Wirbelkörpern fördert.The advantage of this embodiment is that, in particular, the opening in the middle of the attachment plate promotes the formation of a bony connection between the vertebral bodies.
Insbesondere hat es sich als vorteilhaft erwiesen, wenn die kreisförmigen Plattenextensionen mindestens teilweise nach aufsteigender Größe oder abfallender Größe entlang der Umrandungsfläche der Ansatzplatte angeordnet sind. Diese Modifikation der Ansatzplatte ermöglicht eine geeignetere Verteilung der Druckfläche, ohne dass die Fläche der Ansatzplatte vergrößert werden müsste, so dass die gewünschte Förderung der Ausbildung einer knöchernen Verbindung für dieses Implantat erhalten bleibt. Bei einer vorteilhaften Ausgestaltung des Implantats weist die Ansatzplatte an ihrer Umrandung eine konvexe Basisfläche über einen Winkel von 80° bis 120° auf. Alternativ und / oder zusätzlich kann die Ansatzplatte an ihrer Umrandung eine konkave Stirnfläche über einen Winkel von 5° bis 40° aufweisen. Zweckmäßig ist es bei dem Implantat weiterhin, wenn dieIn particular, it has proved to be advantageous if the circular plate extensions are arranged at least partially in ascending size or decreasing size along the peripheral surface of the attachment plate. This modification of the lug plate allows a more appropriate distribution of the pressure surface without the need to increase the area of the lug plate so that the desired promotion of the formation of a bony connection for this implant is maintained. In an advantageous embodiment of the implant, the lug plate has at its border a convex base surface over an angle of 80 ° to 120 °. Alternatively and / or additionally, the attachment plate may have at its border a concave end face over an angle of 5 ° to 40 °. It is expedient for the implant, if the
Ansatzplatte spiegelsymmetrisch mit einer Symmetrieachse von der Mitte der konkaven Stirnfläche zu der Mitte der konvexen Basisfläche ausgestaltet ist.Bump plate is designed mirror-symmetrically with an axis of symmetry from the center of the concave end face to the center of the convex base surface.
Dem Lastverhalten wird besonders gut entsprochen, wenn die kreisförmigen Plattenextensionen von der konvexen Basisfläche zu der konkaven Stirnfläche mit aufsteigender Größe angeordnet sind.The load behavior is particularly well met when the circular plate extensions are arranged from the convex base surface to the concave face of increasing size.
Weiterhin betrifft die vorliegende Erfindung eine Ansatzplatte für ein Implantat nach einem der vorhergehenden Gesichtspunkte.Furthermore, the present invention relates to a lug plate for an implant according to one of the preceding aspects.
Im Folgenden wird die Erfindung an einem in der Zeichnung dargestellten Ausführungsbeispiel näher erläutert; es zeigen:In the following the invention will be explained in more detail in an embodiment shown in the drawing; show it:
Fig. 1 eine perspektivische Darstellung eines aus einem erstenFig. 1 is a perspective view of one of a first
Implantatteil und einem zweiten Implantatteil bestehenden Implantats mit einer Ansatzplatte nach der vorliegenden Erfindung,Implant part and a second implant part existing implant with a lug plate according to the present invention,
Fig. 2 das Implantat aus der Figur 1 in einer Seitenansicht,2 shows the implant of Figure 1 in a side view,
Fig. 3 eine isolierte, perspektivische Darstellung einer Oberseite einer oberen Ansatzplatte nach der vorliegenden Erfindung, und Fig. 4 eine isolierte, perspektivische Darstellung einer Unterseite einer oberen Ansatzplatte nach der vorliegenden Erfindung.Fig. 3 is an isolated, perspective view of an upper side of an upper lug plate according to the present invention, and Fig. 4 is an isolated, perspective view of a bottom of an upper attachment plate according to the present invention.
In den Figuren 1 und 2 ist ein Implantat 1 dargestellt, das zum Einsetzen zwischen in der Zeichnung selber nicht dargestellten Wirbelkörpern der Wirbelsäule als Platzhalter für aus der Wirbelsäule entfernte Bandscheiben, Wirbel oder Wirbelteile dient. Das Implantat 1 umfasst ein erstes Implantatteil 2 und ein zweites Implantatteil 3, die in Richtung ihrer koaxialen Längsachsen zur Längenänderung des Implantates 1 gegeneinander verstellbar sind. Die Längenänderung kann z. B. über einen dem zweiten Implantatteil 3 zugeordneten drehbaren Gewindering 4 durchgeführt werden.In the figures 1 and 2, an implant 1 is shown, which serves for insertion between the vertebral bodies of the spine, not shown in the drawing itself as a placeholder for removed from the spine intervertebral discs, vertebrae or vertebrae. The implant 1 comprises a first implant part 2 and a second implant part 3, which are adjustable in the direction of their coaxial longitudinal axes to change the length of the implant 1 against each other. The change in length can z. B. via a second implant part 3 associated rotatable threaded ring 4 are performed.
Das Implantat 1 weist weiterhin mindestens eine, in dem gezeigten Ausführungsbeispiel eine obere Ansatzplatte 5a und eine untere Ansatzplatte 5b auf, die an den freien Enden der beiden Implantatteile 2, 3 in im Wesentlichen zur Längsachse des Implantates 1 senkrechter Ausrichtung durch Mittel zur lösbaren Befestigung auswechselbar angeschlossen sind, wobei die obere Ansatzplatte 5a und die untere Ansatzplatte 5b zur Anpassung an die Form der Grundplatte des Wirbelkörpers bzw. an die Form der Deckplatte des Wirbelkörpers unterschiedlich ausgestaltet sein können.The implant 1 further has at least one, in the embodiment shown, an upper attachment plate 5a and a lower attachment plate 5b, which can be exchanged at the free ends of the two implant parts 2, 3 in a direction substantially perpendicular to the longitudinal axis of the implant 1 by means for detachable attachment are connected, wherein the upper lug plate 5a and the lower lug plate 5b may be configured differently to adapt to the shape of the base plate of the vertebral body or to the shape of the cover plate of the vertebral body.
Die Figuren 3 und 4 zeigen eine isolierte, perspektivische Darstellung eine Oberseite bzw. einer Unterseite einer oberen Ansatzplatte 5a nach der vorliegenden Erfindung. Die obere Ansatzplatte 5a weist eine kreisförmige Grundform 8 auf, deren Umrandungsfläche durch Superpositionen von im Wesentlichen kreisförmigen ersten Plattenextensionen 9 und zweiten Plattenextensionen 10 modifiziert ist. Die zweite Plattenextension 10 weist einen größeren Durchmesser als die erste Plattenextension 9 auf und die erste Plattenextension 9 und die zweite Plattenextension 10 können sich im Grad der Überlappung mit der kreisförmigen Grundform 8 der oberen Ansatzplatte 5a unterscheiden.Figures 3 and 4 show an isolated perspective view of a top and a bottom of an upper lug plate 5a according to the present invention. The upper lug plate 5a has a circular basic shape 8, the peripheral surface of which is modified by superpositions of substantially circular first plate extensions 9 and second plate extensions 10. The second plate extension 10 has a larger diameter than the first plate extension 9 and the first plate extension 9 and the second plate extension 10 may be in the Degree of overlap with the circular basic shape 8 of the upper approach plate 5a differ.
Bei dem Implantat 1 kann die kreisförmige Grundform 8 einen inneren Ring mit einer Öffnung 13 umfassen. Die Superpositionen der ersten Plattenextension 9 und der zweiten Plattenextension 10 bilden einen äußeren, entsprechend modifizierten Ring, bei dem ein äußerer Teil der zweiten Plattenextension 10 über den äußeren Ring hinausragt. Weiterhin kann die zweite Plattenextension 10 einen verbreiterten Halsabschnitt aufweisen und sich von dem verbreiterten Halsabschnitt zu der Umrandungsfläche in der Höhe verjüngen, so dass ein keilförmigerIn the case of the implant 1, the circular basic shape 8 may comprise an inner ring with an opening 13. The superpositions of the first plate extension 9 and the second plate extension 10 form an outer, correspondingly modified ring, in which an outer part of the second plate extension 10 protrudes beyond the outer ring. Furthermore, the second plate extension 10 may have a widened neck portion and taper in height from the widened neck portion to the skirting surface, so that a wedge-shaped
Querschnitt entsteht, der an seiner Spitze über den äußeren Ring hinausragt.Cross-section is formed, which protrudes at its tip over the outer ring.
An der Umrandungsfläche weist die obere Ansatzplatte 5a eine konvexe Basisfläche 11 über einen Winkel von 80° bis 120° auf. Gegenüber der Basisfläche 11 ist eine konkave Stirnfläche 12 über einen Winkel von 5° bis 40° angeordnet. Bevorzugt ist die obere Ansatzplatte 5a spiegelsymmetrisch mit einer Symmetrieachse von der Mitte der konkaven Stirnfläche 12 zu der Mitte der konvexen Basisfläche 11 ausgestaltet. Insbesondere können die ersten und die zweiten Plattenextension 9, 10 an der Umrandung der Ansatzplatte 5a in aufsteigender Größe von der konvexen Basisfläche 11 zu der konkaven Stirnfläche 12 angeordnet sein. At the peripheral surface, the upper lug plate 5a has a convex base surface 11 over an angle of 80 ° to 120 °. Opposite the base surface 11, a concave end face 12 is arranged over an angle of 5 ° to 40 °. Preferably, the upper lug plate 5a is designed mirror-symmetrically with an axis of symmetry from the center of the concave end face 12 to the center of the convex base surface 11. In particular, the first and the second plate extensions 9, 10 may be arranged on the border of the attachment plate 5a in ascending size from the convex base surface 11 to the concave end face 12.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Implantat1 implant
2 erstes Implantatteil2 first implant part
3 zweites Implantatteil 4 drehbarer Gewindering3 second implant part 4 rotatable threaded ring
5a obere Ansatzplatte5a upper attachment plate
5b untere Ansatzplatte5b lower attachment plate
6 Öffnung in der Ansatzplatte6 opening in the lug plate
7 dem Wirbelkörper zugewandte Oberfläche 8 kreisförmige Grundform der Ansatzplatte7 the vertebral body facing surface 8 circular basic shape of the approach plate
9 erste kreisförmige Plattenextensionen9 first circular plate extensions
10 zweite kreisförmige Plattenextensionen mit verbreiterten Halsabschnitt10 second circular plate extensions with widened neck section
11 konvexe Basisfläche11 convex base surface
12 konkave Stirnfläche 13 Öffnung 12 concave face 13 opening

Claims

Patentansprüche: claims:
1. Implantat (1 ) zum Einsetzen zwischen Wirbelkörper der Wirbelsäule als Platzhalter für aus der Wirbelsäule entfernte Bandscheiben, Wirbel oder Wirbelteile, mit einem ersten Implantatteil (2), einem zweiten Implantatteil (3), die in Richtung ihrer koaxialen Längsachsen zur Längenänderung des1. implant (1) for insertion between the vertebral body of the spine as a placeholder for removed from the spine intervertebral discs, vertebrae or vertebrae, with a first implant part (2), a second implant part (3) in the direction of their coaxial longitudinal axes for the change in length of
Implantats (1 ) gegeneinander verstellbar sind, und einer Ansatzplatte (5a, 5b), die an dem freien Ende mindestens eines der beiden Implantatteile (2, 3) in im Wesentlichen zur Längsachse senkrechter Ausrichtung durch Mittel zur lösbaren Befestigung anschließbar ist, dadurch gekennzeichnet, dass die Ansatzplatte (5a, 5b) eine kreisförmigeImplant (1) are mutually adjustable, and a shoulder plate (5a, 5b), which is connectable to the free end of at least one of the two implant parts (2, 3) in a direction substantially perpendicular to the longitudinal axis alignment by means for releasably securing, characterized the lug plate (5a, 5b) has a circular shape
Grundform (8) aufweist und dass die kreisförmige Grundform (8) am Umfang durch Superpositionen von im Wesentlichen kreisförmigen Plattenextensionen (9, 10) mit unterschiedlichen Durchmessern und /oder unterschiedlichem Überlappungsgrad mit der kreisförmigen Grundform (8) modifiziert ist.Basic shape (8) and in that the circular basic shape (8) is modified circumferentially by superpositions of substantially circular plate extensions (9, 10) with different diameters and / or different degree of overlap with the circular basic shape (8).
2. Implantat (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass die kreisförmigen Plattenextensionen (9, 10) eine Teilmenge an kreisförmigen Plattenextensionen (10) umfassen, die einen verbreiterten Halsabschnitt zu der kreisförmigen Grundform (8) aufweisen.The implant (1) according to claim 1, characterized in that the circular plate extensions (9, 10) comprise a subset of circular plate extensions (10) having a widened neck portion to the circular basic shape (8).
3. Implantat (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass zumindest ein Teil der kreisförmigen Plattenextensionen (9, 10) sich von dem verbreiterten Halsabschnitt zu der Umrandungsfläche in der Höhe verjüngt. 3. implant (1) according to claim 1 or 2, characterized in that at least a portion of the circular plate extensions (9, 10) tapers from the widened neck portion to the peripheral surface in height.
4. Implantat (1 ) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die kreisförmigen Plattenextensionen (9, 10) mindestens teilweise nach aufsteigender Größe oder abfallender Größe entlang der Umrandungsfläche der Ansatzplatte (5a, 5b) angeordnet sind.4. implant (1) according to any one of the preceding claims, characterized in that the circular plate extensions (9, 10) at least partially according to ascending size or decreasing size along the peripheral surface of the lug plate (5a, 5b) are arranged.
5. Implantat (1 ) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die kreisförmige Grundform (8) einen inneren Ring mit einer Öffnung (13) umfasst und dass die Superpositionen der im Wesentlichen kreisförmigen Plattenextensionen (9, 10) einen äußeren, entsprechend modifizierten Ring bilden.5. Implant (1) according to one of the preceding claims, characterized in that the circular basic shape (8) comprises an inner ring with an opening (13) and that the superpositions of the substantially circular plate extensions (9, 10) have an outer, respectively form modified ring.
6. Implantat (1 ) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Ansatzplatte (5a, 5b) an ihrer Umrandung eine konvexe Basisfläche (1 1 ) über einen Winkel von 80° bis 120° aufweist.6. implant (1) according to any one of the preceding claims, characterized in that the lug plate (5a, 5b) at its border a convex base surface (1 1) over an angle of 80 ° to 120 °.
7. Implantat (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Ansatzplatte (5a, 5b) an ihrer Umrandung eine konkave Stirnfläche (12) über einen Winkel von 5° bis 40° aufweist.7. implant (1) according to any one of the preceding claims, characterized in that the lug plate (5a, 5b) has at its border a concave end face (12) over an angle of 5 ° to 40 °.
8. Implantat (1 ) nach Anspruch 7 in Abhängigkeit von Anspruch 6, dadurch gekennzeichnet, dass die kreisförmigen Plattenextensionen (9, 10) von der konvexen Basisfläche (11 ) zu der konkaven Stirnfläche (12) mit aufsteigender Größe an der Umrandung angeordnet sind.An implant (1) according to claim 7 when dependent on claim 6, characterized in that the circular plate extensions (9, 10) are arranged from the convex base surface (11) to the concave face (12) of increasing size on the border.
9. Implantat (1 ) nach Anspruch 8 oder nach Anspruch 7 in Abhängigkeit von Anspruch 6, dadurch gekennzeichnet, dass die Ansatzplatte (5a, 5b) spiegelsymmetrisch mit einer Symmetrieachse von der Mitte der konkaven Stirnfläche (12) zu der Mitte der konvexen Basisfläche (11 ) ausgestaltet ist.9. Implant (1) according to claim 8 or claim 7 as a function of claim 6, characterized in that the lug plate (5a, 5b) mirror-symmetrical with an axis of symmetry from the center of the concave end surface (12) to the center of the convex base surface (11) is configured.
10. Ansatzplatte (5a, 5b) für ein Implantat (1) nach einem der vorhergehenden Ansprüche. 10. attachment plate (5a, 5b) for an implant (1) according to one of the preceding claims.
EP08874923A 2008-09-19 2008-09-19 Implant for insertion between vertebral bodies of the spinal column Withdrawn EP2323592A1 (en)

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