WO2006099887A1 - Vertebral column implant - Google Patents

Vertebral column implant Download PDF

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Publication number
WO2006099887A1
WO2006099887A1 PCT/EP2005/003193 EP2005003193W WO2006099887A1 WO 2006099887 A1 WO2006099887 A1 WO 2006099887A1 EP 2005003193 W EP2005003193 W EP 2005003193W WO 2006099887 A1 WO2006099887 A1 WO 2006099887A1
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WO
WIPO (PCT)
Prior art keywords
implant
cervical spine
implant part
insert
cervical
Prior art date
Application number
PCT/EP2005/003193
Other languages
German (de)
French (fr)
Inventor
Hans Grundei
Original Assignee
Eska Implants Gmbh & Co.
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 Eska Implants Gmbh & Co. filed Critical Eska Implants Gmbh & Co.
Priority to PCT/EP2005/003193 priority Critical patent/WO2006099887A1/en
Publication of WO2006099887A1 publication Critical patent/WO2006099887A1/en

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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
    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
    • A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
    • 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
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • 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
    • A61F2002/30133—Rounded shapes, e.g. with rounded corners kidney-shaped or bean-shaped
    • 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
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649—Ball-and-socket joints
    • 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
    • A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
    • A61F2002/30682—Means for preventing migration of particles released by the joint, e.g. wear debris or cement particles
    • A61F2002/30685—Means for reducing or preventing the generation of wear particulates
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30884—Fins or wings, e.g. longitudinal wings for preventing rotation within the bone 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30907—Nets or sleeves applied to surface of prostheses or in cement
    • A61F2002/30909—Nets
    • 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
    • A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
    • A61F2002/443—Intervertebral or spinal discs, e.g. resilient made of articulated components having two transversal endplates and at least one intermediate component
    • 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
    • A61F2230/0015—Kidney-shaped, e.g. bean-shaped
    • 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
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00928—Coating or prosthesis-covering structure made of glass or of glass-containing compounds, e.g. of bioglass

Definitions

  • the present invention relates to a cervical spine implant.
  • Such implants are known and in use.
  • the problem with these implants is the limited mobility of the cervical spine after implantation. Usually natural movements like nodding or shaking the head are often limited.
  • the greater the mobility of the implant the more stable the secondary fixation of the implant must be in order to be able to absorb the forces occurring.
  • known implants show significant deficits.
  • the cervical spine implant according to the invention has a first implant part to be implanted in a cervical vertebra and a second implant part to be implanted in the adjacent cervical vertebra.
  • the first implant part has on the back a planar support surface for the bone, which is at least partially provided with a three-dimensional open-mesh spatial network structure, and on the front side a curved surface.
  • the second implant part also has a flat support surface for the bone on the back, which is at least partially provided with a three-dimensional open-mesh spatial network structure, and on the front side one of the curvature of the surface of the first Implant part according to concave surface. Both surfaces of the implant parts act together in the manner of a joint, in such a way that they can perform each other movements with medial-lateral and dorsal-ventral components.
  • the cervical spine implant thus acts like a joint that allows all natural body movements of the patient.
  • the prerequisite for this is a secure fixation in the cervical vertebrae.
  • the respective planar bearing surface of both implant parts with the three-dimensional open-meshed spatial network structure is used. Bone trabeculae grow into and through this spatial network structure and ensure a secure secondary fixation. Bone material organizes itself into the spatial network structure after implantation and thus forms the basis for safe secondary fixation.
  • both implant parts have at least one backward extending from medial to lateral Arret istssteg.
  • a corresponding groove must be milled into the respective cervical vertebral body, into which then the bar or struts can be inserted.
  • the proportions are to be chosen so that the one or more webs can be taken in the groove or grooves, whereby a certain primary stability is generated.
  • a curved insert is inserted as a sliding partner for the concave surface of the second implant part.
  • a second insert as a sliding partner for the curved surface of the first implant part is admitted. Through these measures, the joint character of the implant is lifted even more.
  • This embodiment offers the possibility of producing the mutually running surfaces of a different material than the remaining parts of the implant parts, which are usually made of a biocompatible metal.
  • the inserts as sliding partners offer the possibility of different pairs of sliding partners.
  • both inserts may be made of metal, if this is a metal powder as starting material, which is sintered in further steps.
  • an insert of metal and the other insert is made of polyethylene. This mating is known in particular from hip arthroplasty.
  • both inserts are made of ceramic.
  • a still further embodiment provides that at least one insert part consists of a metal coated with a glass ceramic layer.
  • the variant that both inserts are made of the thus coated metal is possible.
  • an insert consists of a ceramic composite material. At this point, let us think of a composite material with ceramic components in a polyurethane matrix.
  • FIG. 1 is a sectional view of a cervical spine implant
  • 2 shows the plan view of the first implant part of the implant according to FIG. 1
  • FIG. 3 shows the plan view of the other implant part of the implant according to FIG. 1.
  • FIG. 1 A first overview provides Fig. 1
  • Both implant parts 2 and 3 can clearly be seen. Both implant parts 2 and 3 each have a locking web 9 or 9 ' at the rear, which are driven into a corresponding milling recess in the respective cervical vertebra, thus ensuring a first primary stability of the implant parts to generate in situ.
  • both implant parts 2 and 3 are provided with a three-dimensional open-meshed spatial network structure 4 or 4 ' , in which bone trabeculae of the bony surfaces following implantation are organized, thus ensuring long-term stability.
  • the front side of the first implant part 2 is provided with a curved surface 7, whereas the second implant part 3 has a concave surface 8, which is adapted to the curvature of the surface 7.
  • a curved insert 5 is inserted as a sliding partner for the concave surface 7 of the second implant.
  • a second insert 6 is inserted into the concave surface 7 of the second implant part 3 as a sliding partner for the curved surface of the first implant part 2 or of the insert part 5.
  • the inserts 5 and 6 are made of materials that are matched to each other to the joint function of the overall implant positive to influence. It is to be thought of the lowest possible friction, as well as the lowest possible abrasion of the material.
  • FIG. 2 shows the plan view of the first implant part 2 from FIG. 1
  • FIG. 3 shows the plan view of the second implant part 3 from FIG. 1.
  • Both implant parts are almost kidney-shaped and adapted with this outer contour of those of the cervical vertebrae.

Abstract

The invention relates to a vertebral column implant that can be used between two adjacent cervical vertebral bodies. Said implant comprises a first implant part (2) that can be implanted in a cervical vertebral body and a second implant part (3) that can be implanted in the neighbouring cervical vertebral body. The rear face of the first implant part (2) comprises a bearing surface for the bones, at least part of said surface being provided with a three-dimensional open-meshed net structure (4). The front face of said part comprises a convex surface (7). The rear face of the second implant part (3) likewise has a planar bearing surface for the bones, at least part of which is provided with a three-dimensional open-meshed net structure (4'). The front face of said part comprises a concave surface (8) corresponding to the curvature of the surface (7) of the first implant part (2). Both surfaces (7, 8) co-operate in an articulated manner in such a way that they can execute medial/lateral and dorsal/ventral displacements in relation to one another.

Description

Halswirbelsäulenimplantat cervical spine implant
Die vorliegende Erfindung betrifft ein Halswirbelsäulenimplantat.The present invention relates to a cervical spine implant.
Derartige Implantate sind bekannt und im Einsatz. Problematisch bei diesen Implantaten ist die eingeschränkte Beweglichkeit der Halswirbelsäule nach der Implantation. Weitgehend natürliche Bewegungen wie mit dem Kopf nicken oder den Kopf schütteln sind oftmals nur eingeschränkt möglich. Je größer die Beweglichkeit des Implantates ist, desto stabiler muss die Sekundärfixation des Implantates sein, um die auftretenden Kräfte abfangen zu können. Hier zeigen bekannte Implantate deutliche Defizite.Such implants are known and in use. The problem with these implants is the limited mobility of the cervical spine after implantation. Mostly natural movements like nodding or shaking the head are often limited. The greater the mobility of the implant, the more stable the secondary fixation of the implant must be in order to be able to absorb the forces occurring. Here, known implants show significant deficits.
Vor diesem Hintergrund ist es die Aufgabe der vorliegenden Erfindung, ein Halswirbelsäulenimplantat anzugeben, das bei einer sicheren Verankerung die größtmögliche Bewegungsfreiheit zulässt.Against this background, it is the object of the present invention to provide a cervical spine implant that allows the greatest possible freedom of movement with a secure anchorage.
Gelöst wird diese Aufgabe durch ein Halswirbelsäulenimplantat mit den Merkmalen des Anspruchs 1. Vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben.This object is achieved by a cervical spine implant having the features of claim 1. Advantageous further developments are specified in the subclaims.
Das erfindungsgemäße Halswirbelsäuleimplantat weist auf ein in einem Halswirbelkörper zu implantierenden erstes Implantatteil und ein in den benachbarten Halswirbelkörper zu implantierenden zweites Implantatteil. Das erste Implantatteil weist rückseitig eine plane Auflagefläche für den Knochen auf, die zumindest teilweise mit einer dreidimensionalen offenmaschigen Raumnetzstruktur versehen ist, sowie vorderseitig eine gewölbte Oberfläche. Das zweite Implantatteil weist rückseitig ebenfalls eine plane Auflagefläche für den Knochen auf, die zumindest teilweise mit einer dreidimensionalen offenmaschigen Raumnetzstruktur versehen ist, und vorderseitig eine der Wölbung der Oberfläche des ersten Implantatteils entsprechend konkave Oberfläche. Beide Oberflächen der Implantatteile wirken nach Art eines Gelenkes zusammen, und zwar derart, daß sie zueinander Bewegungen mit medial-lateralen und dorsal-ventralen Komponenten ausführen können.The cervical spine implant according to the invention has a first implant part to be implanted in a cervical vertebra and a second implant part to be implanted in the adjacent cervical vertebra. The first implant part has on the back a planar support surface for the bone, which is at least partially provided with a three-dimensional open-mesh spatial network structure, and on the front side a curved surface. The second implant part also has a flat support surface for the bone on the back, which is at least partially provided with a three-dimensional open-mesh spatial network structure, and on the front side one of the curvature of the surface of the first Implant part according to concave surface. Both surfaces of the implant parts act together in the manner of a joint, in such a way that they can perform each other movements with medial-lateral and dorsal-ventral components.
Das Halswirbelsäulenimplantat wirkt also wie ein Gelenk, welches alle natürlichen Körperbewegungen des Patienten zulässt. Die Vorraussetzung hierfür ist eine sichere Fixation in den Halswirbelkörpern. Hierzu dient die jeweils plane Auflagefläche beider Implantatteile mit der dreidimensionalen offenmaschigen Raumnetzstruktur. In diese Raumnetzstruktur und durch diese hindurch wachsen Knochentrabekel und sorgen für eine sichere Sekundärfixation. Knochenmaterial organisiert sich nach der Implantation in die Raumnetzstruktur ein und bildet damit die Grundlage für die sichere Sekundärfixation.The cervical spine implant thus acts like a joint that allows all natural body movements of the patient. The prerequisite for this is a secure fixation in the cervical vertebrae. For this purpose, the respective planar bearing surface of both implant parts with the three-dimensional open-meshed spatial network structure is used. Bone trabeculae grow into and through this spatial network structure and ensure a secure secondary fixation. Bone material organizes itself into the spatial network structure after implantation and thus forms the basis for safe secondary fixation.
Eine weitere Maßnahme ist gemäß einer vorteilhaften Ausführungsform geeignet, die Belastungen noch tiefer in den jeweiligen Halswirbelkörper zu leiten. Danach ist vorgesehen, daß beide Implantatteile rückwärtig wenigstens jeweils einen von medial nach lateral verlaufenden Arretierungssteg aufweisen. Für die Implantation muss eine entsprechende Nut in den jeweiligen Halswirbelkörper gefräst werden, in welche dann der oder die Stege eingesetzt werden können. Die Größenverhältnisse sind dabei so zu wählen, daß der oder die Stege in die Nut oder Nuten eingeschlagen werden können, womit eine gewisse Primärstabilität erzeugt wird.Another measure is suitable according to an advantageous embodiment, to direct the loads even deeper into the respective cervical vertebrae. Thereafter, it is provided that both implant parts have at least one backward extending from medial to lateral Arretierungssteg. For the implantation, a corresponding groove must be milled into the respective cervical vertebral body, into which then the bar or struts can be inserted. The proportions are to be chosen so that the one or more webs can be taken in the groove or grooves, whereby a certain primary stability is generated.
Gemäß einer bevorzugten Ausführungsform ist vorgesehen, daß in die gewölbte Oberfläche des ersten Implantatteils ein gewölbtes Einlegeteil als Gleitpartner für die konkave Oberfläche des zweiten Implantatteils eingelassen ist. In Analogie hierzu kann vorgesehen sein, daß in die konkave Oberfläche des zweiten Implantatteils ein zweites Einlegeteil als Gleitpartner für die gewölbte Oberfläche des ersten Implantatteiles eingelassen ist. Durch diese Maßnahmen wird der Gelenkcharakter des Implantates noch stärker herausgehoben. Diese Ausführungsform bietet die Möglichkeit, die gegeneinander laufende Flächen aus einem anderen Material zu fertigen als die übrigen Teile der Implantatteile, welche üblicherweise aus einem körperverträglichen Metal bestehen werden. Die Einlegeteile als Gleitpartner bieten die Möglichkeit unterschiedliche Paarungen von Gleitpartnern.According to a preferred embodiment it is provided that in the curved surface of the first implant part, a curved insert is inserted as a sliding partner for the concave surface of the second implant part. By analogy, it can be provided that in the concave surface of the second implant part, a second insert as a sliding partner for the curved surface of the first implant part is admitted. Through these measures, the joint character of the implant is lifted even more. This embodiment offers the possibility of producing the mutually running surfaces of a different material than the remaining parts of the implant parts, which are usually made of a biocompatible metal. The inserts as sliding partners offer the possibility of different pairs of sliding partners.
Bevorzugt können beide Einlegeteile aus Metall bestehen, wenn dieses als Ausgangsmaterial ein Metallpulver ist, welches in weiteren Schritten versintert wird.Preferably, both inserts may be made of metal, if this is a metal powder as starting material, which is sintered in further steps.
Es ist auch möglich, daß ein Einlegeteil aus Metall und das andere Einlegeteil aus Polyethylen besteht. Diese Paarung ist insbesondere aus der Hüftgelenksendoprothetik bekannt.It is also possible that an insert of metal and the other insert is made of polyethylene. This mating is known in particular from hip arthroplasty.
Eine weitere Möglichkeit besteht darin, daß beide Einlegeteile aus Keramik bestehen.Another possibility is that both inserts are made of ceramic.
Eine noch weitere Ausführungsform sieht vor, daß zumindest ein Einlegeteil aus einem mit einer Glaskeramikschicht beschichteten Metall besteht. Auch die Variante, daß beide Einlegeteile aus dem so beschichteten Metall bestehen, ist möglich.A still further embodiment provides that at least one insert part consists of a metal coated with a glass ceramic layer. The variant that both inserts are made of the thus coated metal is possible.
Es ist auch denkbar, daß ein Einlegeteil aus einem keramischen Kompositwerkstoff besteht. An dieser Stelle sei an ein Kompositwerkstoff mit keramischen Anteilen in einer Polyurethanmatrix gedacht.It is also conceivable that an insert consists of a ceramic composite material. At this point, let us think of a composite material with ceramic components in a polyurethane matrix.
Die Erfindung wird anhand eines Ausführungsbeispieles gemäß der Zeichnungsfiguren näher erläutert. Hierbei zeigt:The invention will be explained in more detail with reference to an embodiment according to the drawing figures. Hereby shows:
Fig. 1 eine Schnittansicht eines Halswirbelsäulenimplantates, Fig. 2 die Aufsicht auf das erste Implantatteil des Implantates gemäß Fig. 1 , und Fig. 3 die Aufsicht auf das andere Implantatteil des Implantates gemäß Fig. 1.1 is a sectional view of a cervical spine implant, 2 shows the plan view of the first implant part of the implant according to FIG. 1, and FIG. 3 shows the plan view of the other implant part of the implant according to FIG. 1.
Nachfolgend sind gleiche Teile mit denselben Bezugszeichen versehen.Hereinafter, like parts are given the same reference numerals.
Einen ersten Überblick verschafft Fig. 1A first overview provides Fig. 1
Deutlich erkennbar ist das erste Implantatteil 2 und das zweite Implantatteil 3. Beide Implantatteile 2 und 3 weisen rückwärtig jeweils einen Arretierungssteg 9 bzw. 9' auf, welche in eine entsprechende Ausfrä- sung im jeweiligen Halswirbelkörper eingeschlagen werden, um so eine erste Primärstabilität der Implantatteile in situ zu erzeugen.The first implant part 2 and the second implant part 3 can clearly be seen. Both implant parts 2 and 3 each have a locking web 9 or 9 ' at the rear, which are driven into a corresponding milling recess in the respective cervical vertebra, thus ensuring a first primary stability of the implant parts to generate in situ.
Rückwärtig sind beide Implantatteile 2 und 3 mit einer dreidimensionalen offenmaschigen Raumnetzstruktur 4 bzw. 4' versehen, in die sich Knochentrabekel der nach Implantation daran anliegenden knöchern- den Flächen einorganisieren und so für eine Langzeitstabilität sorgen. Vorderseitig ist das erste Implantatteil 2 mit einer gewölbten Oberfläche 7 ausgestattet, wohingegen das zweite Implantatteil 3 eine konkave Oberfläche 8 aufweist, die der Wölbung der Oberfläche 7 angepasst ist. In die gewölbte Oberfläche 7 des ersten Implantatteiles 2 ist ein gewölbtes Einlegeteil 5 als Gleitpartner für die konkave Oberfläche 7 des zweiten Implantates eingelassen. In den dargestellten Ausführungsbeispielen ist in die konkave Oberfläche 7 des zweiten Implantatteils 3 ein zweites Einlegeteil 6 als Gleitpartner für die gewölbte Oberfläche des ersten Implantatteils 2 bzw. des Einlegeteils 5 eingelassen. Die Einlegeteile 5 und 6 bestehen aus Materialien, die aufeinander abgestimmt sind, um die Gelenkfunktion des Gesamtimplantates insgesamt positiv zu beeinflussen. Dabei ist an eine möglichst geringe Reibung zu denken, ebenso wie an einen möglichst geringen Abrieb des Materials.At the rear, both implant parts 2 and 3 are provided with a three-dimensional open-meshed spatial network structure 4 or 4 ' , in which bone trabeculae of the bony surfaces following implantation are organized, thus ensuring long-term stability. The front side of the first implant part 2 is provided with a curved surface 7, whereas the second implant part 3 has a concave surface 8, which is adapted to the curvature of the surface 7. In the curved surface 7 of the first implant part 2, a curved insert 5 is inserted as a sliding partner for the concave surface 7 of the second implant. In the illustrated embodiments, a second insert 6 is inserted into the concave surface 7 of the second implant part 3 as a sliding partner for the curved surface of the first implant part 2 or of the insert part 5. The inserts 5 and 6 are made of materials that are matched to each other to the joint function of the overall implant positive to influence. It is to be thought of the lowest possible friction, as well as the lowest possible abrasion of the material.
Die Fig. 2 und 3 runden das Bild insgesamt ab. Fig. 2 zeigt die Aufsicht auf das erste Implantatteil 2 aus Fig. 1 , wohingegen Fig. 3 die Aufsicht auf das zweite Implantatteil 3 aus Fig. 1 zeigt.Figures 2 and 3 complete the picture as a whole. FIG. 2 shows the plan view of the first implant part 2 from FIG. 1, whereas FIG. 3 shows the plan view of the second implant part 3 from FIG. 1.
Beide Implantatteile sind fast nierenförmig ausgebildet und mit dieser Außenkontur jenen der Halswirbelkörper angepasst. Both implant parts are almost kidney-shaped and adapted with this outer contour of those of the cervical vertebrae.

Claims

Patentansprüche claims
1. Halswirbelsäulenimplantat zum Einsatz zwischen zwei benachbarten Halswirbelkörpern, aufweisend ein in einem Halswirbelkörper zu implantierenden ersten Implantatteil (2) und ein in dem benachbarten Halswirbelkörper zu implantierenden zweiten Implantatteil (3), bei demA cervical spine implant for use between two adjacent cervical vertebrae, comprising a first implant part (2) to be implanted in a cervical vertebra and a second implant part (3) to be implanted in the adjacent cervical vertebra
- das erste Implantatteil (2) rückseitig eine Plane Auflagefläche für den Knochen aufweist, die zumindest teilweise mit einer dreidimensionalen offenmaschigen Raumnetzstruktur (4) versehen ist, und vorderseitig eine gewölbte Oberfläche (7) aufweist,the first implant part (2) has on the back a plane bearing surface for the bone which is at least partially provided with a three-dimensional open-mesh spatial network structure (4) and has an arched surface (7) on the front side,
- das zweite Implantatteil (3) rückseitig ebenfalls eine Plane Auflagefläche für den Knochen aufweist, die zumindest teilweise mit einer dreidimensionalen offenmaschigen Raumnetzstruktur (4') versehen ist, und vorderseitig eine der Wölbung der Oberfläche (7) des ersten Implantatteils (2) entsprechend konkave Oberfläche (8) aufweist, wobei- The second implant part (3) on the back also has a plane bearing surface for the bone, which is at least partially provided with a three-dimensional open-mesh spatial network structure (4 '), and on the front one of the curvature of the surface (7) of the first implant part (2) corresponding concave Surface (8), wherein
beide Oberflächen (7, 8) nach Art eines Gelenkes zusammenwirken, derart, dass sie zueinander Bewegungen mit medial-lateralen und dorsal-ventralen Komponenten ausführen können.both surfaces (7, 8) interact in the manner of a joint, such that they can perform movements with medial-lateral and dorsal-ventral components to each other.
2. Halswirbelsäulenimplantat nach Anspruch 1 , bei dem in die gewölbte Oberfläche (7) des ersten Implantatteils (2) ein gewölbtes Einlegeteil (5) als Gleitpartner für die konkave Oberfläche (8) des zweiten Implantatteils (3) eingelassen ist. 2. cervical spine implant according to claim 1, wherein in the curved surface (7) of the first implant part (2) a curved insert (5) is inserted as a sliding partner for the concave surface (8) of the second implant part (3).
3. Halswirbelsäulenimplantat nach Anspruch 1 oder 2, bei dem in die konkave Oberfläche (7) des zweiten Implantatteils (3) ein zweites Einlegeteil (6) als Gleitpartner für die gewölbte Oberfläche (7) des ersten Implantatteils (2) eingelassen ist.3. cervical spine implant according to claim 1 or 2, in which in the concave surface (7) of the second implant part (3) a second insert (6) is inserted as a sliding partner for the curved surface (7) of the first implant part (2).
4. Halswirbelsäulenimplantat nach Anspruch 2 oder 3, bei dem beide Einlegeteile (5, 6) aus Metall bestehen.4. cervical spine implant according to claim 2 or 3, wherein both inserts (5, 6) consist of metal.
5. Halswirbelsäulenimplantat nach Anspruch 2 oder 3, bei dem ein Einlegeteil (5) aus Metall und das andere Einlegeteil (6) aus Po- lyethylen besteht.5. Cervical spine implant according to claim 2 or 3, in which an insert (5) consists of metal and the other insert (6) consists of polyethylene.
6. Halswirbelsäulenimplantat nach Anspruch 2 oder 3, bei dem beide Einlegeteile (5, 6) aus Keramik bestehen.6. cervical spine implant according to claim 2 or 3, wherein both inserts (5, 6) consist of ceramic.
7. Halswirbelsäulenimplantat nach Anspruch 2 oder 3, bei dem zumindest ein Einlegeteil (5, 6) aus einem mit einer Glaskeramikschicht beschichteten Metall besteht.7. cervical spine implant according to claim 2 or 3, wherein at least one insert (5, 6) consists of a metal coated with a glass ceramic layer.
8. Halswirbelsäulenimplantat nach Anspruch 7, bei dem ein Einlegeteil (5, 6) aus einem keramischen Kompositwerkstoff besteht.8. cervical spine implant according to claim 7, wherein an insert (5, 6) consists of a ceramic composite material.
9. Halswirbelsäulenimplantat nach einem der Ansprüche 1 bis 8, bei dem beide Implantatteile (2, 3) rückwärtig wenigsten jeweils einen von medial nach lateral verlaufenden Arretierungssteg (9, 9') aufweisen. 9. cervical spine implant according to one of claims 1 to 8, wherein the two implant parts (2, 3) rearmost least each having a medial to laterally extending Arretierungssteg (9, 9 ').
PCT/EP2005/003193 2005-03-24 2005-03-24 Vertebral column implant WO2006099887A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002034169A2 (en) * 2000-10-20 2002-05-02 Sdgi Holdings, Inc. Anchoring devices and implants for intervertebral disc augmentation
US6517580B1 (en) * 2000-03-03 2003-02-11 Scient'x Societe A Responsabilite Limited Disk prosthesis for cervical vertebrae
US20040002761A1 (en) * 2002-06-27 2004-01-01 Christopher Rogers Intervertebral disc having translation
WO2004028415A1 (en) * 2002-09-26 2004-04-08 Spinecore, Inc. Artificial intervertebral disc having a captured ball and socket joint
DE20320454U1 (en) * 2003-12-22 2004-10-14 Meisel, Hans Jörg, Dr. med. Component for a prosthesis, especially a cervica vertebra, comprises two base parts coupled together by a hinge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6517580B1 (en) * 2000-03-03 2003-02-11 Scient'x Societe A Responsabilite Limited Disk prosthesis for cervical vertebrae
WO2002034169A2 (en) * 2000-10-20 2002-05-02 Sdgi Holdings, Inc. Anchoring devices and implants for intervertebral disc augmentation
US20040002761A1 (en) * 2002-06-27 2004-01-01 Christopher Rogers Intervertebral disc having translation
WO2004028415A1 (en) * 2002-09-26 2004-04-08 Spinecore, Inc. Artificial intervertebral disc having a captured ball and socket joint
DE20320454U1 (en) * 2003-12-22 2004-10-14 Meisel, Hans Jörg, Dr. med. Component for a prosthesis, especially a cervica vertebra, comprises two base parts coupled together by a hinge

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