DE10361957A1 - Implant for use between cervical vertebrae, comprises two components that move against each other, provides increased freedom of movement - Google Patents

Implant for use between cervical vertebrae, comprises two components that move against each other, provides increased freedom of movement Download PDF

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Publication number
DE10361957A1
DE10361957A1 DE2003161957 DE10361957A DE10361957A1 DE 10361957 A1 DE10361957 A1 DE 10361957A1 DE 2003161957 DE2003161957 DE 2003161957 DE 10361957 A DE10361957 A DE 10361957A DE 10361957 A1 DE10361957 A1 DE 10361957A1
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Prior art keywords
implant
cervical spine
insert
cervical
implant part
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Granted
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DE2003161957
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German (de)
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DE10361957B4 (en
Inventor
Hans Dr. Grundei
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ORTHODYNAMICS GMBH, DE
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Eska Implants GmbH and Co KG
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Priority to DE2003161957 priority Critical patent/DE10361957B4/en
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    • 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
    • A61F2002/30108—Shapes
    • A61F2002/30199—Three-dimensional shapes
    • A61F2002/30299—Three-dimensional shapes umbrella-shaped or mushroom-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
    • A61F2/3094—Designing or manufacturing processes
    • A61F2002/30968—Sintering
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0093—Umbrella-shaped, e.g. mushroom-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
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00329—Glasses, e.g. bioglass
    • 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

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (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

Implant (A) for placement between two adjacent vertebrae in the cervical spinal column. Implant (A) for placement between two adjacent vertebrae in the cervical spinal column comprises two components (2; 3) for implanting in adjacent vertebrae where each has, on its back, a flat support surface, for contacting the bone, at least partly covered by a three-dimensional, open-mesh net structure (4). Component (2) has a curved surface (7) on its front, while (3) has a concave surface (8), on its front, corresponding to the curvature of (7). The surfaces (7) and (8) combine together to act like a join that allows movements with medial-lateral and dorsal-ventral components.

Description

Die vorliegende Erfindung betrifft ein Halswirbelsäulenimplantat.The 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. Problematic with these Implants is the limited Mobility of the cervical spine after implantation. Largely natural Movements like nodding your head or shaking your head often only limited possible. The bigger the The flexibility of the implant is, the more stable the secondary fixation of the implant to be able to absorb the forces occurring. Here show known implants significant deficits.

Vor diesem Hintergrund ist es die Aufgabe der vorliegenden Erfindung, ein Halswirbelsäulenimplantat anzugeben, das bei einer sicheren Verankerung die größtmögliche Bewegungsfreiheit zulässt.In front In this context, it is the object of the present invention a cervical spine implant indicate the greatest possible freedom of movement with a secure anchoring allows.

Gelöst wird diese Aufgabe durch ein Halswirbelsäulenimplantat mit den Merkmalen des Anspruchs 1. Vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben.Is solved this task by a cervical spine implant with the features of claim 1. Advantageous 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 indicates a first to be implanted in a cervical vertebra Implant part and one in the adjacent cervical vertebrae too implanting second implant part. The first implant part has the back a flat bearing surface for the Bone on, at least partially, with a three-dimensional open mesh network structure is provided, as well as front side a domed one Surface. The second implant part has the back also a flat bearing surface for the Bone on, at least partially, with a three-dimensional open mesh network structure is provided, and front one the vault the surface the first implant part corresponding concave surface. Both surfaces the implant parts act together in the manner of a joint, and Although in such a way that they are related to each other Movements with medial-lateral and dorsal-ventral components To run can.

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 So it acts like a joint, which controls all natural body movements of the patient allows. The prerequisite for this is a secure fixation in the cervical vertebrae. This is the purpose of each flat contact surface of both Implant parts with the three-dimensional open-mesh spatial network structure. In this spatial network structure and through this grow bone trabeculae and take care of a secure secondary fixation. Bone material organizes after implantation in the spatial network structure 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.A further consequences is according to one advantageous embodiment suitable to direct the burden even deeper into the respective cervical vertebrae. Thereafter, it is envisaged that both Implant parts back at least each one of medial to laterally extending Arretierungssteg exhibit. For the implantation must be milled a corresponding groove in the respective cervical vertebral body, in which then the one or more webs can be used. The proportions are so to choose, that the or the webs can be hammered into the groove or grooves, which produces a certain primary stability becomes.

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 one preferred embodiment provided that in the arched one surface of the first implant part a curved insert as a sliding partner for the concave surface is embedded in the second implant part. In analogy to this can be provided that in the concave surface of the second implant part, a second insert as a sliding partner for the domed surface of the first implant part is inserted. Through these measures the joint character of the implant is lifted even more. This embodiment offers the possibility, the opposing surfaces made of a different material than the other parts of the implant parts, which usually from a biocompatible Metal will be. The inserts offer as sliding partners the possibility different pairings of sliding partners.

Bevorzugt können beide Einlegeteile aus Metall bestehen, wenn dieses als Ausgangsmaterial ein Metallpulver ist, welches in weiteren Schritten versintert wird.Prefers can both inserts are made of metal, if this as a starting material Metal powder is, 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 possible, too, the existence Insert made of metal and the other insert made of polyethylene. This mating is known in particular from hip arthroplasty.

Eine weitere Möglichkeit besteht darin, daß beide Einlegeteile aus Keramik bestehen.A another possibility is that both Inserts 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 yet another embodiment provides that at least an insert of a coated with a glass ceramic layer Metal exists. Also the variant that both inserts from the So 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 a Insert consists of a ceramic composite material. At this Place is a composite material with ceramic components in a polyurethane matrix thought.

Die Erfindung wird anhand eines Ausführungsbeispieles gemäß der Zeichnungsfiguren näher erläutert. Hierbei zeigt:The Invention is based on an embodiment according to the drawing figures explained in more detail. in this connection shows:

1 eine Schnittansicht eines Halswirbelsäulenimplantates, 1 a sectional view of a cervical spine implant,

2 die Aufsicht auf das erste Implantatteil des Implantates gemäß 1, und 2 the plan view of the first implant part of the implant according to 1 , and

3 die Aufsicht auf das andere Implantatteil des Implantates gemäß 1. 3 the plan view of the other implant part of the implant according to 1 ,

Nachfolgend sind gleiche Teile mit denselben Bezugszeichen versehen.following the same parts are provided with the same reference numerals.

Einen ersten Überblick verschafft 1 Get a first overview 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 Ausfräsung im jeweiligen Halswirbelkörper eingeschlagen werden, um so eine erste Primärstabilität der Implantatteile in situ zu erzeugen.Clearly visible is the first implant part 2 and the second implant part 3 , Both implant parts 2 and 3 each have a locking bar at the rear 9 respectively. 9 ' which are hammered into a corresponding cutout in the respective cervical vertebrae so as to generate a first primary stability of the implant parts 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 knöchernden 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 back are both implant parts 2 and 3 with a three-dimensional open-meshed spatial network structure 4 respectively. 4 ' Bone trabeculae of the bony surfaces adjacent thereto after implantation, thus ensuring long-term stability. The front side is the first implant part 2 with a curved surface 7 whereas the second implant part 3 a concave surface 8th that has the curvature of the surface 7 is adjusted. In the arched surface 7 of the first implant part 2 is a curved insert 5 as sliding partner for the concave surface 7 embedded the second implant. In the illustrated embodiments is in the concave surface 7 of the second implant part 3 a second insert 6 as a sliding partner for the curved surface of the first implant part 2 or the insert 5 admitted. The inserts 5 and 6 consist of materials that are coordinated to positively influence the overall joint function of the overall implant. It is to be thought of the lowest possible friction, as well as the lowest possible abrasion of the material.

Die 2 und 3 runden das Bild insgesamt ab. 2 zeigt die Aufsicht auf das erste Implantatteil 2 aus 1, wohingegen 3 die Aufsicht auf das zweite Implantatteil 3 aus 1 zeigt.The 2 and 3 complete the picture altogether. 2 shows the top view of the first implant part 2 out 1 , whereas 3 the supervision of the second implant part 3 out 1 shows.

Beide Implantatteile sind fast nierenförmig ausgebildet und mit dieser Außenkontur jenen der Halswirbelkörper angepasst.Both Implant parts are almost kidney-shaped and with this outer contour those of the cervical vertebrae customized.

Claims (9)

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 dem – 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, – 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 beide Oberflächen (7, 8) nach Art eines Gelenkes zusammenwirken, derart, dass sie zueinander Bewegungen mit medial-lateralen und dorsal-ventralen Komponenten ausführen können.Cervical spine implant for use between two adjacent cervical vertebrae, comprising a first implant part to be implanted in a cervical vertebral body ( 2 ) and a to be implanted in the adjacent cervical vertebra second implant part ( 3 ), in which - the first implant part ( 2 ) has on the back a tarpaulin support surface for the bone, which at least partially with a three-dimensional open-mesh spatial network structure ( 4 ), and on the front a curved surface ( 7 ), - the second implant part ( 3 ) also has on the back a tarp bearing surface for the bone, which at least partially has 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 ) according to concave surface ( 8th ), both surfaces ( 7 . 8th ) cooperate in the manner of a joint, such that they can perform movements with medial-lateral and dorsal-ventral components to each other. 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.Cervical spine implant according to claim 1, in which the curved surface ( 7 ) of the first implant part ( 2 ) a curved insert ( 5 ) as a sliding partner for the concave surface ( 8th ) of the second implant part ( 3 ) is admitted. 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.Cervical spine implant according to claim 1 or 2, wherein in the concave surface ( 7 ) of the second implant part ( 3 ) a second insert ( 6 ) as a sliding partner for the curved surface ( 7 ) of the first implant part ( 2 ) is admitted. Halswirbelsäulenimplantat nach Anspruch 2 oder 3, bei dem beide Einlegeteile (5, 6) aus Metall bestehen.Cervical spine implant according to claim 2 or 3, in which both inserts ( 5 . 6 ) consist of metal. Halswirbelsäulenimplantat nach Anspruch 2 oder 3, bei dem ein Einlegeteil (5) aus Metall und das andere Einlegeteil (6) aus Polyethylen besteht.Cervical spine implant according to claim 2 or 3, wherein an insert ( 5 ) made of metal and the other insert ( 6 ) consists of polyethylene. Halswirbelsäulenimplantat nach Anspruch 2 oder 3, bei dem beide Einlegeteile (5, 6) aus Keramik bestehen.Cervical spine implant according to claim 2 or 3, in which both inserts ( 5 . 6 ) consist of ceramic. Halswirbelsäulenimplantat nach Anspruch 2 oder 3, bei dem zumindest ein Einlegeteil (5, 6) aus einem mit einer Glaskeramikschicht beschichteten Metall besteht.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. Halswirbelsäulenimplantat nach Anspruch 7, bei dem ein Einlegeteil (5, 6) aus einem keramischen Kompositwerkstoff besteht.Cervical spine implant according to claim 7, wherein an insert ( 5 . 6 ) consists of a ceramic composite material. 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.Cervical spine implant according to one of claims 1 to 8, in which both implant parts ( 2 . 3 ) Rearmost least each one of medial to laterally extending Arretierungssteg ( 9 . 9 ' ) exhibit.
DE2003161957 2003-12-23 2003-12-23 cervical spine implant Expired - Fee Related DE10361957B4 (en)

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