CH624573A5 - Intervertebral prosthesis - Google Patents

Intervertebral prosthesis Download PDF

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Publication number
CH624573A5
CH624573A5 CH107578A CH107578A CH624573A5 CH 624573 A5 CH624573 A5 CH 624573A5 CH 107578 A CH107578 A CH 107578A CH 107578 A CH107578 A CH 107578A CH 624573 A5 CH624573 A5 CH 624573A5
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CH
Switzerland
Prior art keywords
body
bearing
characterized
prosthesis
cup
Prior art date
Application number
CH107578A
Other languages
German (de)
Inventor
Bernhard Georg Prof Dr M Weber
Original Assignee
Sulzer Ag
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.)
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Publication date
Application filed by Sulzer Ag filed Critical Sulzer Ag
Priority to CH107578A priority Critical patent/CH624573A5/en
Publication of CH624573A5 publication Critical patent/CH624573A5/en

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442Intervertebral or spinal discs, e.g. resilient
    • A61F2/4425Intervertebral or spinal discs, e.g. resilient made of articulated components
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30721Accessories
    • A61F2/30724Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/30199Three-dimensional shapes
    • A61F2002/30242Three-dimensional shapes spherical
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/30199Three-dimensional shapes
    • A61F2002/30252Three-dimensional shapes quadric-shaped
    • A61F2002/30253Three-dimensional shapes quadric-shaped ellipsoidal or ovoid
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30621Features concering the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30639Features concering the anatomical functioning or articulation of the prosthetic joint having rolling elements between both articulating surfaces
    • A61F2002/30642Features concering the anatomical functioning or articulation of the prosthetic joint having rolling elements between both articulating surfaces having a single rolling (or sliding) ball articulating between two cups
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30621Features concering the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649Ball-and-socket joints
    • A61F2002/30663Ball-and-socket joints multiaxial, e.g. biaxial; multipolar, e.g. bipolar or having an intermediate shell articulating between the ball and the socket
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves
    • A61F2002/30878Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30879Ribs
    • A61F2002/30883Ribs dovetail-shaped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442Intervertebral or spinal discs, e.g. resilient
    • A61F2/4425Intervertebral or spinal discs, e.g. resilient made of articulated components
    • A61F2002/443Intervertebral or spinal discs, e.g. resilient made of articulated components having two transversal endplates and at least one intermediate component
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/46Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2002/4631Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063Three-dimensional shapes
    • A61F2230/0071Three-dimensional shapes spherical
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063Three-dimensional shapes
    • A61F2230/0073Quadric-shaped
    • A61F2230/0076Quadric-shaped ellipsoidal or ovoid
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00179Ceramics or ceramic-like structures

Description

Die Erfindung betrifft eine Zwischenwirbel-Prothese, insbesondere für Halswirbel, bei der zwischen den einander zugewandten, benachbarten Endflächen zweier Wirbelkörper mindestens ein Zwischenkörper eingelegt ist. The invention relates to an intervertebral prosthesis, particularly for cervical vertebrae, at the side facing each other between the adjacent end faces of two vertebrae, an intermediate body is least loaded.

Eine Zwischenwirbel-Prothese hat die Aufgabe, als Ersatz einer erkrankten Zwischenwirbelbandscheibe zu dienen. An intervertebral prosthesis has the duty to serve as a replacement of a diseased intervertebral disc. Sie soll in gewissen Fällen das übliche Operationsverfahren der Versteifung zwei benachbarter Wirbelkörper mit Hilfe von Knochenspänen ersetzen. You should replace the usual surgical procedures of the stiffening two adjacent vertebrae using bone chips in certain cases. Dort geht die Beweglichkeit zwischen den zwei Nachbarwirbeln verloren, was mit der neuen Prothese vermieden werden soll. There, the mobility between the two neighboring vertebrae is lost, what should be avoided with the new prosthesis.

Es ist bekannt, zwischen einzelnen Wirbeln — nach Entfernen der Knorpel-Zwischenschicht — kissenartige Zwischenlagen oder kugelförmige Zwischenkörper aus Kunststoff einzulegen (FR-PS 1 122 634). It is known between individual vertebrae - after removal of the cartilage intermediate layer - insert pillow-like intermediate layers or intermediate spherical body of plastic (FR-PS 1,122,634). Während die als elastische Dämpfungselemente dienenden Zwischenlagen die Einhaltung eines Mindestabstandes nicht gewährleisten, ergeben sich bei kugelförmigen Zwischenkörpern relativ hohe spezifische Auflagendrücke auf dem sie umgebenden knöcheren Gewebe, was zu Schädigungen dieses Gewebes führen kann. While serving as elastic damping elements liners not ensure compliance with a minimum distance, resulting in spherical intermediate bodies relatively high specific bearing pressures on the surrounding knöcheren tissues, which can lead to damage to this tissue.

Aufgabe der Erfindung ist es daher, eine Prothese zu schaffen, bei der die Beweglichkeit zweier Wirbel gegeneinander erhalten bleibt, ein Mindestabstand zwischen den zwei Wirbeln gewährleistet ist und niedrige spezifische Auflagedrücke gewährleistet sind. The object of the invention is therefore to provide a prosthesis in which the mobility of two vertebrae remains against each obtained ensures a minimum distance between the two vertebrae and low specific bearing pressures are ensured. Diese dreifache Aufgabe wird gemäss der Erfindung gelöst durch je in einer Endfläche verankerbare Lagerpfannen, deren Basis eine schalenförmige Ausnehmung hat, und durch einen Abstandskörper, der in den Hohlraum zwischen einander zugewandten Ausnehmungen zweier Lagerpfannen eingelegt ist. This triple task is solved according to the invention by each anchored in an end surface bearing sockets, whose base has a cup-shaped recess, and by a spacing body, which is inserted into the cavity between the facing recesses of two bearing pans.

Die auf ihrer Verankerungsseite beispielsweise dachförmig ausgebildete Lagerpfanne bildet eine gegenüber einer Kugel stark vergrösserte Auflagefläche, mit der die Prothese in den Wirbelkörpern abgestützt ist; For example roof-shaped at its anchoring side bearing bushing forms a ball against a greatly enlarged contact surface to which the prosthesis is supported in the vertebral bodies; der Abstandskörper zwischen den Lagerpfannen gewährleistet einen Mindestabstand zwischen zwei Wirbelkörpern. the spacer body between the bearing pans ensures a minimum distance between two vertebral bodies.

Besonders gute Gleiteigenschaften zwischen Pfanne und Abstandskörper erzielt man, wenn in an sich bekannter Weise der Abstandskörper aus Biokeramik und die Lagerpfanne aus Kunststoff, insbesondere aus High-Density-Polyäthylen (HDPE), bestehen. are obtained particularly good sliding properties between the ladle and the spacer body, when made of bioceramics and the bearing bushing made of plastic, in particular from high-density polyethylene in a conventional manner of the spacer body (HDPE) made. Für eine relativ weite und gleichmässige Verteilung der Auflagedrücke ist es weiterhin vorteilhaft, For a relatively wide and uniform distribution of the edition pressures it is also advantageous,

wenn der Abstandskörper linsenförmig ausgebildet ist. when the spacer body is formed lenticular.

Für eine zementfreie Veränderung in den Wirbelkörpern kann die Lagerpfanne vorteilhaft eine verbreiterte, Hinterschneidungen erzeugende Bodenplatte und Nuten aufweisen, wobei die Nuten mindestens teilweise unter einem Winkel zur Längsrichtung der Hinterschneidungen verlaufen. For a cement-free change in the vertebral bodies, the bearing cup may have a widened, undercuts generating base plate and grooves advantageous, wherein the grooves extend at least partly at an angle to the longitudinal direction of the undercuts.

Im folgenden wird die Erfindung anhand von Ausführungsbeispielen im Zusammenhang mit der Zeichnung näher erläutert. In the following the invention is explained in detail by means of exemplary embodiments in conjunction with the drawings.

Fig. 1 zeigt in schematisch perspektivischer Darstellung — in Richtung frontal auf den Körper gesehen — eine Aufsicht auf einen Wirbelkörper eines unteren Hals- oder eines Brustwirbels, in den eine der neuen Lagerpfannen eingesetzt ist; Fig. 1 shows in schematic perspective view - seen in the direction frontally on the body - a top view of a vertebral body of a lower cervical or thoracic vertebra, is inserted into the one of the new bearing cups;

Fig. 2 ist der Schnitt II-II von Fig. 1 und stellt zwei einander gegenüberliegende Flächen von in benachbarte Wirbelkörper eingesetzte Lagerpfannen dar; Fig. 2 is the section II-II of Figure 1 and provides two mutually constitute opposing surfaces of adjacent vertebral bodies inserted into bearing cups.

Fig. 3 gibt in gleicher Darstellung wie Fig. 1 eine zweite Ausführungsform einer in einem Wirbelkörper verankerten Pfanne wieder, während Fig. 3 shows in the same representation as Fig. 1 shows a second embodiment of an anchored in a vertebral body pan again, while

Fig. 4, ähnlich wie Fig. 2, ein Schnitt IV-IV durch zwei benachbarte Wirbelkörper ist, is Fig. 4, similar to Fig. 2, a section IV-IV through two adjacent vertebral bodies,

Fig. 5 und 6 schliesslich zeigen in gleicher Darstellung eine weitere Ausführungsform. FIGS. 5 and 6, finally, show a further embodiment in the same representation.

In eine — beispielsweise mit einem Fräser hergestellte — Ausnehmung eines Wirbelkörpers 1, an dem auf beiden Seiten der Fig. 1 noch die Ansätze 3 für die Wirbelfortsätze angedeutet sind, ist eine Lagerpfanne 4 eingesetzt, die beispielsweise einen rechteckigen oder quadratischen Grundriss hat. In one - prepared for example using a milling cutter -. Recess of a vertebral body 1, on which on both sides of Figure 1 nor the lugs 3 are indicated for the spinous processes, a step bearing 4 is inserted, which for example has a rectangular or square plan.

In die äussere, dh benachbarten Wirbel zugewandte, Oberfläche der Pfanne 4 ist eine schalenförmige Ausnehmung 7 eingelassen, die in Form und Grösse an einen Abstandskörper 8 (Fig. 2 und 4) angepasst ist, der zwischen die Lagerpfannen 4 zweier benachbarter Wirbelkörper 1 als Prothesenkörper eingelegt wird. facing into the outer, ie adjacent vertebrae, surface of the cup 4 is a cup-shaped recess 7 inserted, which is adapted in shape and size to a spacer body 8 (Fig. 2 and 4), the two between the bearing cups 4 adjacent vertebral bodies 1 as a prosthesis body is inserted. Der Abstandskörper 8 ist im vorliegenden Beispiel linsenförmig ausgebildet, kann aber auch eine Kugel, ein kugelähnlicher oder ein elliptischer Körper sein. The spacing element 8 is formed lens-shaped in the present example, but may also be a ball, a ball-like or an elliptical body to be.

Die Ausführungsform nach Fig. 1 und 2, die für eine zementfreie Verankerung im Wirbelkörper 2 bestimmt ist, hat eine verbreiterte Bodenplatte 5, so dass in Richtung des Einschiebens eine mit Knochensubstanz gefüllte Hinterschneidung 6 entsteht. The embodiment according to FIGS. 1 and 2, which is intended for cementless fixation in the vertebral body 2, has a widened bottom plate 5, so that a column filled with bone undercut 6 is formed in the direction of insertion. Als Sicherung gegen unbeabsichtigtes Ausschieben des Pfanne 4 aus dem Wirbelkörper 2 bei zementfreier Verankerung sind in den Boden 5 der Pfanne 4 Nuten 9 eingeschnitten, von denen mindestens eine einen Winkel, vorzugsweise von 90°, mit der Längsrichtung der Hinterschneidung 6 bildet. As a safeguard against inadvertent expulsion of the cup 4 from the vertebral body 2 in cement-free anchoring 4 grooves 9 are cut in the bottom 5 of the cup, at least one of which preferably forms an angle of 90 °, with the longitudinal direction of the undercut. 6 In diese Nut 9 wächst nach der Implantation Knochengewebe ein und verhindert so ein Verschieben der eingesetzten Pfanne 4 im Körper 2. Wird die Pfanne 4 quadratisch ausgebildet, so können durch Verbreiterung der Bodenplatte 5 Hinterschneidungen 6 auf allen vier Quadratseiten vorgesehen sein; In this groove 9 is growing bone tissue after implantation and thus prevents a displacement of the cup 4 used in the body 2. If the socket 4 are formed square, so 6 may be provided on all four sides of the square by widening the base plate 5 undercuts; in diesem Fall ermöglichen zwei senkrecht zueinander angeordnete Nuten 9 — wie sie im Ausführungsbeispiel nach Fig. 1 und 2 gezeigt sind — ein Einsetzen des Pfannenkörpers in den Wirbelkörper, ohne dass auf eine Vorzugsrichtung geachtet werden müsste. in this case, enable two mutually perpendicular grooves 9 - as shown in the embodiment 1 and 2 of Figure -. insertion of the cup body into the vertebral body, without the need to pay attention to a preferred direction.

Die Pfanne 4' gemäss Fig. 3 und 4 ist für eine Verankerung mittels eines Knochenzementbetts 10 vorgesehen. The pan 4 'according to FIG. 3 and 4 is intended for anchoring by means of a bone cement bed 10. Ihre Verankerungsseite 5' ist im Querschnitt keilförmig ausgebildet und trägt für eine verbesserte Haftung in dem Zementbett 10, über ihre dachförmig ausgebildete äussere Oberfläche verteilt, schwalbenschwanzförmige Vorsprünge 11. Its anchoring side 5 'is wedge-shaped in cross section and carries for improved adhesion in the cement bed 10, distributed over its roof-shaped outer surface, dovetail-shaped projections. 11

Die Schalen 14 der dritten Ausführungsform sind uhrenglasartig ausgebildet; The shells 14 of the third embodiment are formed hourglass-like; sie werden in operativ entsprechend vorbereitete, schalenförmige Ausnehmungen der Wirbelkörper 1 they are prepared in accordance with surgically, cup-shaped recesses of the vertebral bodies 1

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eingesetzt und stützen sich mit einem Rand 15 zusätzlich auf der Endfläche des Wirbelkörpers 1 ab. used and are supported in addition with a rim 15 on the end surface of the vertebral body 1 from. Ihre dem Wirbelkörper zugewandte Fläche 16 hat eine rauhe Struktur, um das Einwachsen im Gewebe und die Verankerung im Wirbelkörper zu erleichtern und zu verbessern. Their facing the vertebral body surface 16 has a rough structure to facilitate the ingrowth of tissue and the anchor in the vertebral body and improve. Der innere Krümmungsradius der Ausnehmung 7 entspricht der Wölbung des zwischengelegten Abstandskörpers 8. The inner radius of curvature of the recess 7 corresponds to the curvature of the interposed spacer body. 8

Wie erwähnt, werden die Pfanne 4 bzw. 14 und der Abstandskörper 8 aus in der Implantat-Technik bewährten Werkstoffen hergestellt; As mentioned, the cup 4 and 14, respectively, and the distance from the body 8 in implant technology proven materials are prepared; insbesondere haben sich hochmolekulares Polyäthylen (HDPE) für die Pfannen und Biokeramik, vor al-s lem hochreines und dichtes A1203, für die Abstandskörper bewährt. in particular, high molecular weight polyethylene have (HDPE) for the pans and bioceramics, proven prior al-s lem highly pure and dense A1203, for the spacer body.

s s

1 Blatt Zeichnungen 1 sheet of drawings

Claims (5)

624 573 624573
1. Zwischenwirbel-Prothese, insbesondere für Halswirbel, bei der zwischen den einander zugewandten, benachbarten Endflächen zweier Wirbelkörper mindestens ein Zwischenkörper eingelegt ist, gekennzeichnet durch je in einer Endfläche verankerbare Lagerpfannen (4, 4'; 14) deren Basis eine schalenförmige Ausnehmung (7) hat, und durch einen Abstandskörper (8), der in den Hohlraum zwischen einander zugewandten Ausnehmungen (7) zweier Lagerpfannen (4,4'; 14) eingelegt ist. 1. An intervertebral prosthesis, in particular for cervical vertebrae, wherein the facing between the mutually adjacent end faces of two vertebrae, an intermediate body is at least inserted, characterized by each anchored in one end face bearing sockets (4, 4 '; 14) the base of a cup-shaped recess (7 ), and by a distance (body 8) (in the cavity between the mutually facing recesses 7) of two bearing sockets (4,4 '; 14) is inserted.
2. Prothese nach Anspruch 1, dadurch gekennzeichnet, 2. A prosthesis according to claim 1, characterized in that
dass der Abstandskörper (8) linsenförmig ausgebildet ist. that the spacer body (8) is lenticular.
2 2
PATENTANSPRÜCHE
3. Prothese nach Anspruch 1 oder 2, dadurch gekennzeichnet. 3. The prosthesis of claim 1 or 2, characterized. dass der Abstandskörper (8) aus Biokeramik und die Lagerpfanne (4,4'; 14) aus Kunststoff, insbesondere aus High-Density-Polyäthylen (HDPE), bestehen. that the spacer body (8) made of bioceramics and the step bearing (4,4 '; 14) made of plastic, in particular high-density polyethylene (HDPE), exist.
4. Prothese nach Anspruch 1, dadurch gekennzeichnet, 4. A prosthesis according to claim 1, characterized in that
dass die Verankerungsseite (5') der Lagerpfanne (4') dachförmig ausgebildet und mit schwalbenschwanzförmigen Vorsprüngen (11) versehen ist. is provided that the anchoring side (5 ') of the bearing cup (4') a roof-shaped and provided with dovetail-shaped projections (11).
5. Prothese nach Anspruch 1, dadurch gekennzeichnet, 5. A prosthesis according to claim 1, characterized in that
dass die Lagerpfanne (4) eine verbreiterte, Hinterschneidun-gen (6) erzeugende Bodenplatte (5) und Nuten (9) aufweist, wobei die Nuten (9) mindestens teilweise unter einem Winkel zur Längsrichtung der Hinterschneidungen (6) verlaufen. that the bearing bushing (4) a widened, undercuts (6) forming the base plate (5) and grooves (9), wherein the grooves extend (9) at least partially at an angle to the longitudinal direction of the undercuts (6).
CH107578A 1978-02-01 1978-02-01 Intervertebral prosthesis CH624573A5 (en)

Priority Applications (1)

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CH107578A CH624573A5 (en) 1978-02-01 1978-02-01 Intervertebral prosthesis

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Application Number Priority Date Filing Date Title
CH107578A CH624573A5 (en) 1978-02-01 1978-02-01 Intervertebral prosthesis
DE19782804936 DE2804936A1 (en) 1978-02-01 1978-02-06 Intervertebral prosthesis
NL7900195A NL7900195A (en) 1978-02-01 1979-01-10 Intervertebral prosthesis.

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CH624573A5 true CH624573A5 (en) 1981-08-14

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CH (1) CH624573A5 (en)
DE (1) DE2804936A1 (en)
NL (1) NL7900195A (en)

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Publication number Publication date
DE2804936A1 (en) 1979-08-02
NL7900195A (en) 1979-08-03

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