WO2010060423A2 - Intervertebral implant - Google Patents

Intervertebral implant Download PDF

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Publication number
WO2010060423A2
WO2010060423A2 PCT/DE2009/001710 DE2009001710W WO2010060423A2 WO 2010060423 A2 WO2010060423 A2 WO 2010060423A2 DE 2009001710 W DE2009001710 W DE 2009001710W WO 2010060423 A2 WO2010060423 A2 WO 2010060423A2
Authority
WO
WIPO (PCT)
Prior art keywords
intervertebral disc
intervertebral
base plate
semi
disc
Prior art date
Application number
PCT/DE2009/001710
Other languages
German (de)
French (fr)
Other versions
WO2010060423A3 (en
Inventor
Henning Kloss
Original Assignee
Privelop-Spine 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.)
Filing date
Publication date
Priority to DE102008060178 priority Critical
Priority to DE102008060178.0 priority
Application filed by Privelop-Spine Ag filed Critical Privelop-Spine Ag
Publication of WO2010060423A2 publication Critical patent/WO2010060423A2/en
Publication of WO2010060423A3 publication Critical patent/WO2010060423A3/en

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Classifications

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    • 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
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    • A61F2/3094Designing or manufacturing processes
    • A61F2/30965Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
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    • 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
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Abstract

The invention relates to intervertebral disk implants which imitate the natural degrees of freedom of movement by allowing translational and/or rotational movements of the disk located between the vertebrae relative to the bottom plate independently of the possible movements of the cover plate relative to said disk located between the vertebrae. Said movements can be performed by mounting the disk located between the vertebrae on the bottom plate by means of fastening means disposed inside the implant in such a way that translational and/or rotational movements are made possible. Furthermore, the contact surface between the cover plate and the disk located between the vertebrae is semi-cylindrical such that the contact surface is maximized.

Description

Intervertebral implant

description

The present invention relates to an intervertebral implant comprising a cover plate and a base plate and a cylindrically configured articulating surface between the cover plate and the intervertebral disc, which the inclination by rotation only about the lateral axis and a tilting movement due to rotation about the lateral axis only in anteriore- posterior direction permits. Through this design, the natural movement of a spinal segment is best modeled.

The spinal column is the physical center of movement of the human body. It carries the body weight, is capable of complex movements and is able to intercept the attacking her strength and balance.

The human spine consists of 24 vertebrae, the sacrum and the coccyx. The individual vertebrae are

Intervertebral discs, the discs separately. The spine is divided into five sections, namely the cervical spine (7 cervical vertebrae, C1 - C7), the thoracic spine (12 thoracic vertebrae Th 1 - Th 12), the back (5 lumbar vertebrae L1 - L5), the sacrum and tailbone.

Each vertebra is composed of a bony vertebral body, a spinal cord spanning the vertebral arch, on the sides in each case a transverse process, and a pointing behind spinous process.

In the medical disciplines, Orthopedics and Neurosurgery of artificial disc replacement traumatisch- heard rheumatisch- or degenerative spine to the surgery.

is prior art to stiffen the spine in the loaded area. With plate or rod materials painful regions are bridged which stiffen over time due to lack of movement. Typically, the reinforcements ventral (towards the belly lying belly side) to the vertebral bodies or posteriorly in the region of the vertebral arches (pedicle) is (belonging to the back, towards lying to the back) made.

while the body's own material (annulus fibrosus and nucleus pulposus) is surgically removed and instead used a placeholder for the artificial replacement of the intervertebral disc. Here mostly rigid cages are used which are system dependent but filled with bone cement or bone chips.

Disadvantages of the known systems is that to treat the symptoms stiffening / fusion of the respective motion segment is accepted. A restoration of the spine in form and function is not reached. The sequence of such procedures are limited mobility and the "adjacent Disc Syndrome" (disc damage to the adjacent site of a fusion intervertebral disc space due to overloading of the same, as it must bear the resultant movement forces from the stiffened segment).

In recent years, systems have been developed which aim to maintain the mobility of the vertebral segments and not to connect two vertebrae in the area of ​​the defective disc rigidly together. Such systems rely mainly viscous or deformable material surrounded by a rigid shell.

US 2002/0128715 A1 for example discloses an artificial intervertebral disc which consists of a deformable, elastic inner body which is deformable within certain predefined limits, and is surrounded by a rigid exoskeleton. Through this artificial disc natural degrees of freedom can be achieved by a predetermined limited deformation of the inner body.

For improvement of the imitation of movement possibilities of a natural vertebral segment are all known artificial spinal discs. It has not yet succeeded in giving the degrees of freedom given to a natural vertebral segment an artificial disc implant. By the defective function of the known implants, the mobility of the spine is not optimally restored. Unausgleichbare peak loads during movement provoke the sinking of the implants into the vertebral body. Further, in the known systems the problem that they are either not stress stable and the pressure acting on the spine continuous loads do not meet, but do not meet or the materials with regard to biocompatibility requirements. In addition, the growth behavior is still insufficient and these processes can lead to renewed pressure on the nerve root.

, Some of the aforementioned disadvantages of the prior art have already been solved by applicant's invention which is the subject of the German patent DE 103 61 772 and the European patent application EP 04803009.2. The German Patent DE 103 61 772 discloses an intervertebral disc implant, comprising a base plate, a cover plate and an intervertebral disc, the intervertebral disc is supported on the base plate so that translational and rotational movements are possible, and the cover plate is mounted on the intervertebral disc that articulating surface of the intervertebral disc and also the articulating surface of the deck plate on each of a partial sphere with the same radii are. This embodiment is able to ensure good mobility of the artificial disc implant due to the possible translational and rotational movements, but still is not able to distinguish between the different case of a natural vertebral segment possibilities of movement in lateral and posterior-anterior direction.

The object of the present invention is to provide an intervertebral disc implant which achieves maximum anatomical compatibility and the best possible way the degrees of motion of a natural intervertebral disc imitated even at continuous operation and thus can replace a natural disc in the long term.

This object is achieved by the provision of an intervertebral implant according to claim 1 and its use according to claim 17th Further advantageous embodiments, aspects and details of the invention emerge from the dependent claims, the description, examples and figures.

The present invention relates to an intervertebral implant comprising a base plate, a cover plate and an intervertebral disc, which may also be an integral part of the base plate or the cover plate, wherein the intervertebral disc has the shape of a half cylinder extends or its longitudinal axis in the lateral direction, lateral parallel to axis extends.

Since a natural vertebral segment also permits the translational movement to some extent in addition to the rotational movement, complex movement patterns which can be modeled only by intervertebral implants that allow various shapes of motion to varying degrees in defined directions occur.

Such kinematic motions able conventional intervertebral disc implants of the prior art does not allow. The intervertebral implants of the invention, however, are designed such that tilting movements suppressed in the lateral direction and direction are registered in posterior (rearward) and anterior (forward). Translation movements are preferably at the same time allows in lateral direction and largely prevented in posterior and anterior direction. herein intervertebral implants described can According to the invention, however, such movement forms, so that the physiological pattern of movement can be very accurately imitated.

The intervertebral implants according to the invention, which can be referred to as artificial discs are preferred three-part structure, ie of a top plate, a base plate and a separate intervertebral disc. but the intervertebral implants according to the invention may also be in two parts. In such a case, the intervertebral disc is firmly connected to the base plate or the cover plate and forms a unit therewith. such

Intervertebral implants are in two parts and consist of a base plate as an integral Bestanteil containing the intervertebral disc and a cover plate. Of course it is also possible to integrate the intervertebral disc in the cover plate so that such intervertebral implants cover plate made with integrated intervertebral disc and base plate.

Is at the two-piece embodiments of the intervertebral disc integrated into the baseplate or firmly connected to this, of course, can not

Relative movement of the base plate for built-in or fixedly connected

Intervertebral disc occur. The same applies if the intervertebral disc is firmly connected to the cover plate or is integrated in it.

However, preferred are the three-part embodiments of intervertebral implants according to the invention, as there is a translational motion of the intervertebral disc relative to the base plate and a rotary motion of the intervertebral disc relative to the cover plate or just a translational motion of the intervertebral disc relative to the cover plate and a rotational movement of the intervertebral disc in relation to the base plate is possible. it is specified below, not rotate 360 ​​degrees can take place. Rotational movement and translational movement are of course limited to the extent possible, as well as a natural vertebral segment can move.

In order to allow the limited rotational movement about the lateral axis, the articulating surface of the intervertebral plate is designed according to the invention semicylindrical.

Figure 2 shows the semi-cylindrical intervertebral disc according to the invention. The term semi-cylindrical shape of a plano-convex is meant, that is a plane surface and a cylindrical surface with a defined radius.

In the three-part embodiment of the intervertebral implant of the invention, the intervertebral disc thus has a flat articulating surface for performing translational movements and a semi-cylindrical articulating surface to execute rotational or tilting or tilting movements in relation to the respective base plate or cover plate.

In the two-part embodiment of the intervertebral implant of the invention the flat articulating surface and the ability of the translational motion is omitted because the intervertebral disk with the respective plate (base plate or cover plate) is fixed to this surface, so that overall a base plate or a cover plate with a semi-cylindrical articulating surface results.

The ends of the half cylinder may also be plane, that is as one would just as well define a half cylinder, or be designed as a conical tower or as a ball attachment. When the cone apex cone attachment may preferably be rounded or spherical. In Figure 2, the ends, ie the side surfaces of the half cylinder designed spherical.

Furthermore, it is essential to the invention that the configured as a half cylinder intervertebral disc is arranged along or parallel to the lateral axis, so that the rotation or tilting or tilting movements in retroflexion

(Anterior) and in Anteflexionsrichtung (posterior) is possible, but not in lateral direction. This means that about the lateral axis a rotating, tilt,

Tilting or rotary motion is possible to some extent, but not to the retroflexion-anteflexion axis and of course not to the axial axis.

In Figure 1, the axes are located in a spinal segment. As an axial axis is the axis along the spine, retroflexion-anteflexion axis extending referred to as the axis through the abdomen and back and as a lateral axis, the axis perpendicular to the axial axis and perpendicular to the retroflexion-anteflexion axis.

The present invention thus relates to two-piece or preferably three-piece intervertebral implant comprising a base plate, a cover plate and an integrated or separate intervertebral disc, the intervertebral disc has the shape of a half-cylinder whose longitudinal axis extends in the lateral direction.

Thus, the intervertebral disc has a flat articulating surface which preferably rests flat on the base plate but also in another embodiment, flatly on the cover plate can rest. The semi-cylindrical surface of the articulating intervertebral disc lies in a corresponding recess of the cover plate or in the other embodiment in a corresponding recess of the base plate.

In Embodiment A, the intervertebral disc is thus with its flat articulating surface on a likewise planar configured articulating surface of the base plate. The base plate is also designed such that it can be attached to the underlying vertebral body, wherein any common configurations for the attachment are possible which are not essential to the invention and will therefore not be discussed further. All mounting options known for intervertebral discs can also be used in the inventive intervertebral discs. The semi-cylindrical articulating surface of the intervertebral disc is located in a correspondingly semi-cylindrical recess of the cover plate. In other words, is the convex articulating surface of the plano-convex intervertebral disc in a correspondingly concave configured recess in the cover plate so that a sliding rotation, tilt, tilting or rotational movement of cover plate of the intervertebral disc about the lateral axis is possible.

In all embodiments, is highly preferred, if the radii of the semi-cylindrical surface of the articulating intervertebral disc and the

Radius of the semi-cylindrical recess in the cover plate (embodiment A) or in the base plate (embodiment B) are identical or nearly identical.

Almost identical means that the semi-cylindrical recess must be slightly larger than the naturally semi-cylindrical intervertebral disc, so that a turning, tilting, tipping or rotational movement is possible. that both

Radii can not be absolutely identical, is aware of the expert.

Figure 6 and Figure 7 show a cover plate having a semi-cylindrical recess, the side faces of the half cylinder are not flat but terminate in a partial sphere or a hemisphere.

The term "half-cylinder" is meant a along its longitudinal axis plan cut-through cylinder, the cylinder need not necessarily be cut in the middle, that is, where the resulting flat surface having the largest diameter, but may be cut through in the central area where the has not formed planar surface the largest possible diameter. However, it is preferred if the intervertebral disc is a part of the entire cylinder the smaller piece, ie the cutting means above the surface and did not take place below the center area of ​​the cylinder.

Of course, the cover plate also has means for attachment to the overlying vertebra, which are also not essential to the invention may have a conventional design and will not be discussed further.

In the embodiment B the cover plate lies with its flat articulating surface on the planar surface of the articulating intervertebral disc and the semi-cylindrical surface of the articulating intervertebral disc is inserted into a corresponding recess in the base plate.

Thus, the embodiments A and B differ only in the fact that in Embodiment A, the rotation, tilt, tilting or rotational movement between the intervertebral disc and the cover plate and in the embodiment B the rotating, tilting, tipping or rotational movement between the intervertebral disk and the base plate takes place, in which embodiment, A is preferred.

In order to mimic the natural movement pattern of a spinal segment even better, of the intervertebral disc on the base plate (embodiment A ') or in relation to the cover plate (embodiment B 1) are provided in further preferred embodiments, translation movements.

The translational motion of the intervertebral disc relative to the base plate are independent of the possible rotating, tilting, tipping or rotational movements of the cover plate relative to the intervertebral disc. Thus, can be moved relative to one another, all three parts of the intervertebral implant according to the invention, whereby the natural degrees of motion of the spine in the best possible can be imitated.

The storage of the intervertebral disc on the base plate in such a way that Tanslationsbewegungen of intervertebral disk and the base plate relative to each other possible can be realized in various ways.

A possible implementation includes the use of fasteners. As fastening means pins, bulges, half-cylinder, brackets, pins, flanges and the like as well as other conceivable means come to restrict the translational motion of the intervertebral disc on the base plate in question, which are preferably mounted on the base plate. The base plate may only be additionally provided with an edge or further, which surrounds the base plate at least partially, and may be by way of segment, ragged, or wavy continuously configured. In addition, various fastening means may be combined and may be two, three, four, five, six or more attachment means such as pins, protrusions, brackets, pins, flanges and the like can be provided. In particular, fixing means are preferred which are completely covered by the intervertebral disc. On the base plate or at the edge of the base plate mounted lateral boundaries in the form of, for example, edges, supports, beads, tracks, or the like, are less preferred because they represent a point of attachment for tissues and can be covered with commercial and / or cartilage, whereby the mobility of intervertebral disc is limited again to the base plate. Thus, fastening means are particularly preferred which are completely covered, that are not accessible to tissue, cartilage and muscle. Completely conceals the fasteners when they are, for example, in the interior of the implant are covered, for example by the intervertebral disc are.

Figures 4 and 5 show a base plate of a preferred embodiment, (A ') according to the invention with two preferably centered arranged pins. Accordingly, the on intervertebral disc, one or two recesses for receiving these pins. Figure 3 shows an intervertebral disc having an elongate and slightly curved anterior recess for receiving the two pins of the base plate, wherein preferably the recess is longer than the distance between the two pins to each other, it is possible so that a translational movement of the two pins in the recess in lateral direction is.

11 shows an intervertebral disc having an elongated cylindrical recess on the flat surface or planan. The base plate has a corresponding semi-cylindrical elevation which is shown in Fig. 13, which fits into the recess in the intervertebral disc, the elevation on the base plate is shorter than the length of the recess in the intervertebral disc, so that a translational motion of the intervertebral disc is made possible on the base plate of a few millimeters. As the "length of the increase" refers to the length of the axis of rotation, if one were to consider the increase to the base plate as a cylinder. As the "length of the recess" in the intervertebral disc is called the length of the axis of rotation, if viewing the recess as a cylinder. These lengths then match the height of the cylinder. In order to allow a translational motion of the intervertebral disc on the base plate, the height of the cylinder, the increase must be smaller than the height of the cylinder of the recess. The difference in height is the distance which can be moved translationally to travel from one extreme point to another, the intervertebral disc on the base plate. Instead of a half cylinder as an elevation on the base plate can which have a distance from each other such a limitation of the translational motion in the lateral direction also by two pins or two hemispheres or two cones or the like realized on the base plate, which is less than the height defined above of cylinder of the recess in the intervertebral disc.

Figure 12 is another preferred embodiment to the inventive embodiment according to Figure 11 with the difference that the recess in the intervertebral disc and the increase on the base plate is slightly bent accordingly. The radius of curvature of the increase on the base plate and the recess in the intervertebral disc is in the range of 10 mm to 100 mm, preferably between 30 mm and 80 mm and especially preferably between 40 mm and 70 mm. Here, too, applies again as for Figures 11 and 13 described that the length of the elevation on the base plate is shorter than the length of the recess in the intervertebral disc. This means that also in the embodiment of Figures 12 and 14, a lateral translational movement is possible, but not along a straight line on a special slightly curved cam track. Considering now the entire implant, so Figure 16 shows the embodiment of the implant according to Figures 12 and 14 with inclined relative to the base cover plate wherein the cover plate is also moved translationally to the base plate. It can be seen that base you cover plate are not moved parallel to each other along a straight line, but were moved to a curved path to each other because the lateral posterior regions of the cover plate extend beyond the lateral posterior areas of the base plate.

The base plate may thus have one or more, preferably centered mounted guide and / or fixing pins, which extend in the direction of the axial axis. In place of the centered positioning of the or the guiding and / or positioning pin (s) may be attached, for example, dorsal ventral offset or decentralized. Preferably, the pins have a diameter of 2 to 15, preferably from 3 to 12 mm, more preferably 5 - 10 mm and especially preferably from 6 to 9 mm and a height of 1 to 5 mm, preferably 2-4 mm and in particular preferably 3 - 4 mm. Furthermore has such a pin is preferably a cylindrical shape or cone shape, however, generally ellipsoidal shapes can be used. A single pin should be substantially centered mounted on the base plate and two pins should, in principle each have the same distance to the outer edge of the base plate, to be thus arranged symmetrically in a way.

The intervertebral disc according to the invention comprises a for receiving the pin or the pins, and preferably the two pins or of the fastening means suitable recess, said recess should have a larger diameter than that of the pins. Such a recess is preferably oblong-shaped, and further preferably banana-shaped bent a little towards the belly (anterior). Instead of an elongate recess for receiving two pins and two individual recesses may be provided, which O-shaped to are preferably round, ellipsoid and the 1, 2-fold to 5-fold, preferably the 1, 5-fold to 3.0 possess times the diameter of the pin to allow a translational motion. For oval individual recesses, the longer diameter of the oval or of the ellipsoid extends along the lateral axis.

Due to the greater development of the respective recess in the intervertebral disc in comparison with the respective pin of the base plate, the respective pin may be in the area defined by the recess borders or

Intervertebral disc within these limits in translation on the

scroll base plate. The recess or the recesses in the

Intervertebral disc are preferably designed such that a total of a translational motion of the intervertebral disc is preferably allowed on the base plate in lateral direction, irrespective of whether the recess contains one or more pins.

Preference is given to a licensed translation movement in lateral direction, also a lower translational movement may be permitted in anterior and posterior direction. The translation in anterior and posterior direction, however, should be only a tenth up to one-fifth of the distance of the potential in the lateral direction translational motion.

Are If these relations in absolute numbers again, can preferably, the intervertebral disc on the base plate from a centered position 0 to 5 mm, preferably 0.5 - 3 mm, more preferably 1 - 2.5 mm, and particularly preferably 1, 5 - 2.0 mm in the lateral direction and 0 to 1 mm, preferably 0.1 to 0.75 mm, more preferably 0.15 to 0.5 mm and most preferably 0,2 - 0,3 mm in anteflexion as well as in move retroflexion. These figures relate to the distance from the centered position to an extreme position. The double distances traveled, starting from one extreme position to the other extreme position.

The intervertebral disc may vary depending on implant size, which depends on, among which fluidized, the intervertebral implant to be used have different thicknesses, which can be, for example 3 mm, 6 mm, 9 mm or 12 mm. Furthermore, the intervertebral disc is preferably non-deformable and made of a hard material such as PEEK [poly (ether ether ketones)], UHMWPE, or a metal such as titanium or titanium oxide or a ceramic.

A further preferred embodiment of the invention comprises two pins, which are mounted centrally placed on the base plate or preferably dorsal or ventral added. The intervertebral disc accordingly has two recesses, which have a larger diameter compared to the diameter of a pin. Therefore, the intervertebral disc can move translationally within the recesses freely around the pins, wherein the translational motion and the rotational motion about the axial or anatomical axis within the recesses is possible. In this configuration, a free rotation of 360 degrees is of course not possible.

Figures 11, 12, 13 and 14 show two preferred embodiments of a three-piece implant, said base plate and cover plate on the side facing the bone side structured ragged and roughened in order to facilitate a better bone ingrowth. In Fig. 11 is shown an oblong or semi-cylindrical recess on the planar surface in the intervertebral disc. Furthermore, the partly cylindrical recess in the base plate can be seen, which serves to receive the part-cylindrical surface of the intervertebral disc. In the corresponding Figure 13 viewed from a different angle to the implant and one recognizes the bottom side of the base plate and the intervertebral disc facing surface of the cover plate. On this surface of the cover plate has a cylindrical protrusion with spherical lateral side surfaces can be seen, wherein comes to lie on the intervertebral disc of this survey. The cylindrical protrusion has substantially the radius of the recess in the intervertebral disc, however, is not as long as the recess in the intervertebral disc, so that the intervertebral disc in the lateral direction on this cylindrical protrusion can slide translationally. This embodiment according to figures 11 and 13 can be in lateral direction, only a translational movement and in anteriore- postteriore direction only to a tilting movement, thus limiting the degrees of freedom in relation to the spatial orientation.

Figures 12 and 14 show a further preferred three part embodiment, the recess in the intervertebral disc is banana-shaped, that is, the shape of a curved cylinder has. The ridge on the cover plate has a corresponding shape, but fills the recess in the intervertebral disk does not completely, ie the recess in the intervertebral disc is longer, so that a curved sliding motion of the intervertebral disc is provided on the cover plate. This also results in a movement in the lateral direction but not in a straight line, but on a curved path.

In all embodiments, however, the part-cylindrical surface of the intervertebral disc, which enables the tilting or tilting movement, strictly cylindrical shape, ie, not as curved such as a banana, because only one cylinder surface and the cylinder part surface allows a tilting movement or tilting movement.

The shown according to the two possible embodiments in Figures 11 and 13, and 12 and 14 movements are illustrated in FIGS. 15 and 16 Figure 15 corresponds to the embodiment according to Figures 11 and 13 showing the implant in anterior inclined form (ie approximately ventral and dorsal panels plates widened), said base plate and the cover plate in the lateral direction are not shifted from each other.

Fig. 16 shows an inventive implant according to Figures 12 and 14 in an inclined posterior position, said base plate and cover plate are laterally shifted from each other. Since the ridge on the cover plate is designed semi banana-shaped, the top plate against each other is not displaced from the base plate along a straight line, but the displacement is carried out against each other along a curve. in Fig. Thus, 16 can be seen, that the cover plate and base plate anterior inclined away from each other, are no longer side face parallel to each other due to the lateral translational motion along a curve, cover plate and base plate, special cover plate opposite the base plate is slightly rotated.

Instead of two, three or more pins may be used, which are usually mounted with uniform spacing on the base plate. Furthermore, lateral supports may be provided instead of pins. The limited by the side mounted to the base plate supports the bottom surface of the base plate is made larger than the overlying bottom surface of the intervertebral disc, so that the intervertebral disc translational and / or rotational movements on the base plate or to perform relative to the base plate can in the framework of the side brackets. Such supports may be for example a solid or broken, straight or wavy bead on the edge or raised edge.

According to the invention, the semi-cylindrical articulating surface is such for the semi-cylindrical surface of the articulating plate (cover plate: Embodiment A, A '; base: Embodiment B, B') mounted such that the articulating surfaces of the two implant parts located on a cylinder face.

By "articulating surface" is (Embodiment A, A ') to understand or the base plate (embodiment B, B'), the surface of the intervertebral disc or the surface of the cover plate which can come into contact with the possible movements with the other surface ,

These come into contact with each other, articulating surfaces of the intervertebral disc and the cover plate or the base plate are located on a part of the surface of a cylinder.

As a contact surface, the surface is to be understood, where at a certain frozen position of the intervertebral disc and the cover plate (embodiment A, A ') or of the intervertebral disc and the base plate (embodiment B B') join the two parts contact each other. Thus, the contact area of ​​the intervertebral disc is located with the cover plate (embodiment A, A ') or the intervertebral disc with the base plate (embodiment B, B') on a partial surface of a cylinder.

The articulating surface of the deck plate (embodiment A, A ') further corresponds to the contact surface and in the embodiment B and B' corresponds to the articulating surface of the base plate of the contact surface.

The radii of the semi-cylinder, that the contact surfaces have a surface portion of a cylinder of the intervertebral disc and associated articulating plate orders of magnitude of R = 15 to 45 mm. According to the size of the disk implant the radii increase. Intervertebral disc implants for the lumbar region have radii 25-45 mm for the thoracic enriches 20 - 40 mm and for the cervical region of 15-35 mm.

The contact surface is at least an area of 500 mm 2, preferably of at least 600 mm 2, more preferably of at least 700 mm 2 and especially preferably at least 800 mm 2. Here, too, it should be noted that the contact area depends on the size of the implant and more intervertebral implants also have a larger contact area. Contact surfaces of this size distribute the mechanical stress on the intervertebral disc and lead to a longer life of the implant.

This inventive configuration, the contact area between the cover plate and the intervertebral disc is maximized, even in complex movements because there is no point-shaped or linear contact surface, but a cylindrical contact area is obtained.

Two embodiments are also conceivable in principle. First, the articulating surface of the deck plate may be convex or plano-convex and the articulating with the top plate surface of the intervertebral disc are concave or plano-configured or the articulating surface of the deck plate is concave and plano-concave and the articulating with the top plate surface of the intervertebral disc convex or plano-convex formed, the latter variant being preferred. Both the first and the second variant, there are further two possible embodiments, namely in variant 1, the concave configured intervertebral disc articulate with a convexly designed cover plate or with a convexly designed base plate, while in a preferred variant 2, the convexly configured intervertebral disc having a concavely configured (embodiment a, a ') or with a concavely configured base plate (embodiment B B') can articulate cover plate. The concave or convex configurations remain the semi-cylindrical configurations, that is the radius of the rounding remains unchanged. The terms concave and convex are only used to indicate the direction of curvature of the semi-cylindrical configuration.

A preferred embodiment of the intervertebral implant thus comprises a base plate, an intervertebral disc and a cover plate, wherein the intervertebral disc is supported on the base plate, the limited translational and / or rotational movements are possible, and is supported the cover plate (embodiment A ') on the intervertebral disc that the articulating surface of the intervertebral disc and also the articulating surface of the deck plate on a respective part of a cylinder surface lie, wherein the cylinders have the same radii.

A further preferred embodiment of the intervertebral implant thus comprises a base plate, an intervertebral disc and a cover plate, wherein the intervertebral disc is mounted on the cover plate, the restricted

Translational and / or rotational movements are possible, and the base plate

(Embodiment B ') is supported on the intervertebral disc in that the articulating surface of the intervertebral disc and also the articulating surface of the base plate in each case a part surface of a cylinder are located, the cylinders have the same radii.

In the inventive embodiments also the cover plate can be inclined from a position parallel to each other up to 20 degrees relative to the base plate. In other words, the cover plate (embodiment A, A ') or just the base plate (embodiment B, B') can be up to 20 degrees relative to the base plate (embodiment A, A ') or to the cover plate (embodiment B, B'), starting from tilting a parallel position to each other.

Further, top and base plates are preferred which are tapered. Cover and base plate are on their ventral side thicker than on its dorsal side, to mimic the natural shape of a vertebral segment better. Cover plate or base plate or the cover and base plate preferably have on their ventral side on the double thickness as seen on the dorsal side. Alternatively have cover plate or base plate or the cover and base plate a gradient of 3%, preferably 6% and most preferably 8% from the dorsal to the ventral end. is particularly preferred that the facing sides of the cover plate and base plate having no bevel and only the sides facing away from each other are sloped from the top plate and base plate. In a further preferred embodiment, only the base plate, or only the top plate is either tapered. The bevel of the cover plate and / or base plate may be up to 10 degrees, preferably 2 to 8 degrees amount (discontinued ventral wide and dorsal). It is also preferable if the bending of the cover plate and / or the base plate is adapted to the physiological conditions in accordance with the curvature of the spine, wherein preferably the cover plate in cranial (toward the head) towards one another degree of the bend having such caudal the base plate in (towards the foot) direction. The spine describes viewed from the side a double-S (kyphosis / lordosis). Specifically, in the lumbar region (lordosis) are the vertebral bodies to each other in an opened ventrally angle. To the corresponding

to supply disc space ideal, the implant with its top and bottom plates of this to each other at an angle to the vertebral body should be adaptable. Background here is to ensure optimum force application on the implant to minimize the risk of dislocation of the intervertebral disc and set the band structures of the spine physiology accordingly. Of course, these aspects would benefit the longevity of the implant. If the intervertebral disc space filled with the anatomical structures accordingly and the intervertebral disc is ideal loaded, so the wear of the polyethylene of the intervertebral disk is reduced. Since an intervertebral disk made of polyethylene, PEEK or other plastics is most exposed to wear, a particular preferred embodiment of the present invention uses an intervertebral disc of metal, optionally coated with a ceramic coating.

It is further preferred if the base plate and the cover plate have a convex curvature directed towards the bone surface. Particularly preferred is the convex curvature of the deck plates towards the bone as well as the vertebral body have a curvature (concave) and thus a sintering of the implant can be prevented in the bone. Advantage would be that the Knochentrabekelstruktur would be charged according to the physiology, would be more space for the growth of bone available and the risk of dislocation of the implant would be reduced. The convexity is preferably in a range of 1 - 5 mm, that is at the highest point is the collection of up to 5mm.

In addition to the possibility of movement of the cover plate and the intervertebral disc intervertebral disc to each other and the base plate can be moved relative to each other. The disc implant according to the invention is configured so that the intervertebral disc (embodiment A, A ') (B, embodiment B or equally on the cover plate') is mounted so on the base plate so that the intervertebral disc in the horizontal plane a few degrees about the axial torsion (axial axis) can be rotated.

The movement of the base plate and the cover plate to each other is similar to a movement of two identical parallel plates, between which a half-cylinder is located, that is a cylinder cut along a plane through its longitudinal axis, wherein the respective plate in contact with the cylinder along at least a partial area of ​​the cylinder surface , The movement of the plates zueinender is similar to the movement of base and cover plates of the intervertebral implant according to the invention to each other, due to the design of base and cover plates and intervertebral disc, lateral flexion movement a Retroflexionsbewegung can not and will run only to a lesser extent, preferably, as a Anteflexionsbewegung.

It is essential to the invention that lateral bending movements are excluded because this movement is not the case with a natural vertebral segment. This is inventively achieved by the configuration of the intervertebral disc as a half-cylinder, the longitudinal axis along the lateral axis. This lateral flexion movements of the articulating plate can be suppressed on the intervertebral disc, because otherwise would have to lift the articulating plate of the intervertebral disc and this can not happen because of the pressure exerted by the spinal pressure. Tilt. Tilt or rotational movements are therefore only on the partial cylinder surface possible and only the partial cylinder surface longitudinal axis, ie about the lateral axis, and thus only Retroflexions- and Anteflexionsrichtung. is allowed to further the bottom-hung, tilting or rotational movement about the lateral axis in retroflexion faster than in Anteflexionsrichtung, we have modeled so the best possible natural movement patterns of a natural vertebral segment the movement possibilities between two vertebral bodies.

Base and cover plates can be up to 10 degrees to rotate relatively, preferably up to 8 degrees, more preferably up to 6 degrees, and particularly preferably up to 4 degrees.

A Retroflexionsbeugebewegung can be made from a centered position to 10 degrees, preferably up to 15 degrees and most preferably up to 20 degrees from. A Anteflexionsbeugebewegung can be made from a centered position to 20 degrees, preferably up to 25 degrees and most preferably up to 30 degrees from. A bending movement in the lateral direction is not possible.

The intervertebral disc is also preferably configured such that it has such a size that in all the possible movements of the cover plate does not touch the base plate. Further, the edges of the cover and base plate have a bend of the mutually facing corners away from each other. This bending of the edges of base and base plate and the design of the intervertebral disc are essential to a long operability of implants according to the invention, since the touching or rubbing (impingement) of deck on a base plate to abrasion and to the release of particles to larger can lead implant pieces which reduce the life of the implant dramatically. In addition, the case of dislocation of the intervertebral disc can occur when base and cover plates touch and the contact area between the top plate and the intervertebral disk is reduced due to a raised deck plate. For the above reasons, therefore, is essential to avoid impingement of the cover and base plate.

Furthermore, the intervertebral disc, ie the disc are preferably made of a hard plastic such as PEEK or polyethylene and, in particular ultra high molecular weight polyethylene (UHMWPE), whereby titanium with a ceramic coating can be used for the intervertebral disc.

The term "ultrahigh molecular weight polyethylene" is not unique. The HDPE (high density PE) is currently considered a PE having a molecular weight of less than 200,000 g / mol. According to DIN ISO 11542 PE is connected to a melt mass-flow rate of less than 0.1 g / 10 min defined as UHMWPE (which would correspond to a molecular weight of about 106 g / mol), according to ASTM D 4020, the limit is 3.1 * 106 g / mol. the indicated, average molecular weight is today UHMWPEs, depending on the manufacturer and used measurement methods of between 3.5 * 106 and 107g / mol. Ultra high Molecular Weight polyethylene (UHMWPE) is a polyethylene according to ISO 5834-2 standard, and Chirulen® TIVAR® Premium are high purity implant materials PEUHMW for use in arthroplasty. preferred articulation partners, they are used in artificial hip, knee, elbow and shoulder joints.

The base plate and the cover plate, and in some embodiments, the intervertebral disc implant according to the invention are generally constructed entirely of a hard material, especially a ceramic, a metal or a metal alloy such as titanium, zirconium, oxidized zirconium, hafnium, platinum, rhodium , niobium, medical grade stainless steel, steel CoCr (cobalt Crom), tantalum, and but can also consist of fiber-reinforced plastics (glass / carbon fiber with a corresponding matrix), PEEK [poly (ether ether ketones)] or polymer materials generally are made. In the case of metal alloys, metals such as aluminum, steel medical and / or gold may also be added.

In further particularly preferred embodiments, a metal, and preferably titanium or a titanium alloy is used to prepare the intervertebral disc. In these more preferred

Embodiments that have a base plate made of titanium or a titanium alloy, a cover plate made of titanium or a titanium alloy and an intervertebral disk made of titanium or a titanium alloy, there are so-called hard-hard pairings and that between the cover plate and the intervertebral disk and between the base plate and the intervertebral disc. In these systems is also particularly preferred if the titanium or the titanium alloy is provided with a ceramic coating. In principle, embodiments are possible which do not use a plastic but also a metal or a metal alloy for the intervertebral disc which is preferably also provided with a ceramic coating. Approved for medical titanium materials should fulfill in particular the DIN ISO 5832-3. In principle, the admission of titanium and titanium alloys as controls Medizinalwerkstoff according to DIN ISO 5832-1 to 5832- 12 standards.

In addition to pure titanium and titanium alloys such as Ti-6Al ^ V, Ti-Nb-Ta-Zr, Ti-AI6 Nb7 thus can (ISO 5832-11) or Ti-29Nb-13Ta- 4.6Zr find use in the present invention. Titanium alloys where the titanium content is at least 50 wt .-%, more preferably 65 wt .-%, still more preferably 80 wt .-% and especially preferably 90 wt .-% is are preferred. Further, the use of pure titanium or medical or of coated or uncoated CoCr alloys for the production of the entire intervertebral disk implant is preferred.

Primary and bottom plate can be cemented or cementless implanted into the bone or attached to the vertebral bone, the cement-free anchoring is preferred.

Further, it is used as a material for the basic body of the base and / or cover plate preferably titanium. Titanium as the base material of the base and top plate of the invention is biologically inert, so grows together firmly with the bone, can be anchored without cement, and is non-allergenic.

By choosing biocompatible, inert materials acceptance of physiologioschen tissue to the implant significantly improved. Due to the use of materials which are particularly suited to withstand tribological loads, the wear of the artificial material (service life) of the implant is minimized and thus the service life is significantly increased.

Bone cells can anchor themselves directly to biocompatible materials when there are a textured surface provided whose open roughness is in the range of 50 to 400 microns.

Thus, the base and cover plates firmly adherent to the bone particularly in cement-free fixing, the surface facing the bone surface of the base has - as well as the cover plate has a roughness Rz of at least 50 .mu.m, preferably of at least 60 microns Rz. Of course, other degrees of roughness can be used to spongiosa.

The roughness Rz is specified as either or Ra (DIN 4762, 4768, 4775, ISO 4288). Rz is the average roughness. The average roughness

Rz is the arithmetic mean of the highest individual roughness depths of a plurality of adjacent sampling lengths. however, Ra represents the arithmetic middle of rough worth. Ra is the generally accepted and internationally applied roughness. He is the arithmetic mean of the absolute values ​​of the profile deviations within the sample. The measured value is always smaller than the Ra on the same

Roughness Rz determined value.

Base and / or cover plate of the intervertebral disc implant according to the invention are preferably coated with a metallic or ceramic coating which may have a variable number of the individual layers or a different layer thickness. Ceramic coatings comprise nitrides, carbides and phosphides of preferably semi-metals and metals or metal alloys. Examples of ceramic coatings are boron nitride, titanium-niobium nitride, titanium calcium phosphide (Ti-Ca-P), Cr-Al-N, Ti-Al-N, CrN, TiAlN CrN, Ti-Al C, CrC, TiAIC-CrC, Zr-Hf-N, Ti-Hf-CN, Si-CN-Ti, Si-CN as well as DLC (Diamond Like carbon). a ceramic layer of titanium niobium nitride (Ti-Nb-N) is also preferably applied as a coating.

In particular, it is advantageous if the articulating surface of the base and the cover plate with titanium niobium nitride (Ti-Nb-N) is coated.

This particular ceramic coating of the articulating implant surfaces has a hardness that is higher by a multiple, than the materials conventionally used by. Through this hardening the surface is protected highly polished and in titanium abrasion.

According to the invention the geometry of the articulating compartments is chosen such that the surfaces which are exposed to the Verscheiß can be maximized. This means that according to the invention the geometry of the joint partners is selected such that a planar contact area between the base plate and the intervertebral disc (embodiment A, A ') or between the cover plate and the intervertebral disc (embodiment B, B') and a cylindrical surface section between the intervertebral disc and cover plate ( embodiment A, A ') or (between the intervertebral disk and base plate embodiment B, B'), the tribologically loaded surfaces are maximized, which ultimately reduces the wear of the implants according to the invention. This results in a reduction of forces per unit area, which in turn has a positive effect by reducing the wear on the service life of the implant. The chosen and adapted to the particular case the geometry of the intervertebral implant, in particular the geometry of the intervertebral disc, and the correct positioning of the implant during the operation, the physiological mobility of the vertebrae to each other in the best possible segments is met. By this near-perfect imitation of a natural disc or their mobility, the forces acting on the bone-implant interface forces are significantly reduced, which has a positive effect on the longevity (reducing wear and minimizing easing) of the implant.

The prostheses of the prior art can only be used to a maximum of two floors in the back mostly. the invention

Intervertebral implants can also be used on more than two floors in the backbone. The individual intervertebral implants are adapted to the size and geometry of their respective position, so that spinal disorders, spinal injury and spinal diseases can be treated by such multiple implants.

These spinal disorders, spinal injuries and spinal disorders that can be treated by an inventive intervertebral implant or by a set of inventive intervertebral implants, for example, include scoliosis, that the lateral curvature of the spine, and curvature of the spine called disc herniation, by which is the emergence of the nucleus pulposus against adjacent vertebral bodies or the nerve roots understood and kyphosis, which indicates the bending of the spine to the back.

Furthermore, can be treated by the inventive intervertebral implants following spinal disorders, spinal injuries and spinal disorders: Discus fraction (ie, intervertebral disc damage), Black Disc (degenerative disc which appears black on X-ray), the spontaneous deformation, ie the deformation of vertebral bodies by diseases, bone changes or tumors , lumbago or more common known as lumbago or Lendenweh, by which is meant a violent, usually sudden pain in the sacrum and lumbar region. Lumbago occurs most frequently by changes in the intervertebral discs. Spondylosis, that disease of the vertebrae and spinal discs with strong movement pain, dowager's hump, which is understood to curvature of the spine in older women, caused by bone loss due to changes in hormonal situation after the air Terium (menopause), Spondylomyelitis, ie inflammation of vertebrae and spinal cord, osteochondrosis, which indicates the change and stunting of intervertebral discs, and osteofibrosa what is the disease of the skeleton in adolescents, spina bifida also known as spina bifida, in particular the congenital cleft spine, lordosis, of which the expert the

Curvature of the spine forward, caused by a hollow back understands Spondylotosis, ie slipping of a vertebra a fuss width, usually the 5th lumbar vertebra on the sacrum, Schipperkrankheit which the demolition fracture caused by heavy exertion, mostly the 7th cervical vertebra or the first thoracic vertebrae spinous process referred, myelomeningocele, among the expert understands the congenital anomaly of vertebral arches, brachialgia what is the pain in the arms and shoulders due to changes in the cervical vertebrae, Baastrup sign what the curvature of the spine forward with broadening the spinous processes and crushing intervening tissue thinks that is usually associated with low back pain and tenderness of the spinous processes, Wirbelankylose, called the bony stiffening of the spine with severe pain in torso, arms and legs and paralysis of limb muscles, Scheuermann's disease, which the expert bone and cartilage inflammation of the individual vertebrae, preferably the thoracic spine in adolescents referred, cervical syndrome, ie diseases of the soft tissues in the cervical spine, lumbar kyphosis, ie curvature of the spine in the lumbar spine, torticollis, ie torticollis, often rheumatic conditions and the spondylitis disease, whereby the inflammatory spinal disorder that causes changes and stiffening of the entire spine apparatus is meant. figure description

Figure 1 shows two vertebrae with vertebral body, the vertebral canal, vertebral arch, transverse processes, spinous process and the associated discs as well as the axes along and perpendicular to the spine;

Figure 2 shows an intervertebral disc with the inventive semi-cylindrical shape, the two ends or side surfaces are not planar but spherical, or more specifically configured quarter spherical; Figure 3 shows the intervertebral disc of its flat side, said quarter-spherical ends or side surfaces are clearly visible, and also the recess for receiving the guide pins of the underlying or overlying plate can be seen, said recess elongated and slightly back so bent to the belly anteriorly is;

Figure 4 shows a base plate with two pins or guide pins which are received in the corresponding recess in the intervertebral disc, wherein the base plate is flat shaped and is thus flat articulating surfaces result, whereby the intervertebral disk can be mounted movable in translation on the base plate;

Figure 5 shows a base plate with two centrally arranged pins. The base plate is rectangular with rounded corners, which shape is not obligatory and may also come round, oval or asymmetric shapes used;

Figure 6 shows a cover plate, wherein the semi-cylindrical recess for

Receiving the semicylindrical designed articulating

Surface of the intervertebral disc is illustrated. It will further be appreciated, therefore, that the recess extends along the longitudinal axis of the lateral axis of the cover plate, and thus tilt or

Rotational movements are possible about the lateral axis; Figure 7 shows the top plate from its bottom to the elongated semi-cylindrical recess as articulating surface for receiving the semi-cylindrical surface of the articulating intervertebral disc;

Figure 8 shows a three-piece according to the invention intervertebral implant consisting of a base plate with two centrally arranged cylindrical pins, a semi-cylindrical intervertebral disc with quarter spherical side faces, and an elongated recess on the flat articulating surface (not shown) for receiving the two pins of the base plate and a cover plate with a corresponding semi-cylindrical recess for receiving the semi-cylindrical surface of the articulating intervertebral disc;

Figure 9 shows the same embodiment of the invention as figure 8, wherein in Figure 9, the elongate and slightly curved ventral recess can be seen in the plan articulating surface of the intervertebral disc; Figure 10 shows schematically an inventive implant with intervertebral disc with planar side faces in an inclined or tilted position, wherein the proportions and shape of the cover plate, the intervertebral disk and the base plate are abstracted and do not correspond to the actual conditions; Figure 11 shows an embodiment according to the invention a three-piece intervertebral implant having a semi-cylindrical

Intervertebral disc for a directed tilting movement, which has on its flat surface a semi-cylindrical or channel-like recess for the support and for limited lateral translation movement; the semi-cylindrical or channel-like recess in the intervertebral disc is straight, that is, (not shown, but visible in Figure 13) without curvature and serves to receive the semi-cylindrical elevation on the base plate, wherein the length of the semi-cylindrical elevation on the base plate is shorter than the length of recess in the intervertebral disc, so that in lateral direction of the intervertebral disc on the

The base plate can be moved up to the respective stop of the increase;

Figure 12 shows schematically an embodiment according to the invention which corresponds to the FIG. 11 with the difference that the recess in the intervertebral disc is not straight but curved, whereby a slightly curved lateral translational motion in

Direction is allowed;

Figure 13 shows the embodiment of the invention according to Figure 11 from a different perspective so that the semi-cylindrical collection or

Increase is visible on the base plate, which abuts the flat surface of the intervertebral disc, wherein the semi-cylindrical protrusion in the recess in the intervertebral disc shown on the plate comes to rest and therein can be moved in translation in lateral direction; Figure 14 schematically shows the same embodiment as Fig. 12, where now the

The base plate is shown as the top part and can be seen the cylindrical but slightly bent increase on the base plate, which in the corresponding recess in the

Intervertebral disc comes to rest so that a translational

Movement is made possible on a slight circular path in priority lateral direction; Figure 15 shows the embodiment of the invention according to FIG 11 and 13 in the assembled state and after; Figure 16 shows schematically;

embodiments

Preferred embodiments of the intervertebral implant according to the invention will now be discussed with reference to Examples, bearing in mind that the examples discussed reflect advantageous embodiments of the invention, but not limited the scope to these embodiments.

example 1

One embodiment of an intervertebral implant according to the invention consists of a cover plate as shown in Fig. 6 and 7, an intervertebral disk as shown in Fig. 2 and 3, and discloses a base plate as shown in Fig. 4 and 5.

The intervertebral implant has a size which is suitable for replacement of a L3 / 4 vertebral segment. Smaller embodiments of the intervertebral implant described in Example 1 are to be produced by a skilled person without any problems. In these embodiments, however, smaller contact surfaces in particular between the intervertebral disc and cover plate can also be correspondingly smaller between the intervertebral disk and the base plate corresponding to the size of the smaller embodiments. The same applies to the above values ​​for the translational motions in lateral and retroflexion anteflexion direction.

The cover plate is made in medical technology used titanium. The side facing the bone surface of the cover plate is rough, so that ingrowth and growth of bone cells is made possible. The roughness Rz is about 60 ± 5 microns. The articulating surfaces of the cover plate is semi-cylindrical plano configured as shown in Fig. 6 and coated with a ceramic layer of Ti-Nb-N. The layer thickness is 3-5 microns.

The articulating surface of the cover plate is located on a cylindrical surface portion having a radius of R = 25 mm.

The base plate is also made of titanium and has a shape as shown in Fig. 4 on. The side facing the bone surface of the base plate is configured with a rough roughness Rz of about 60 ± 5 microns. The contact surface for the intervertebral disc is coated with a ceramic coating of Ti-Nb-N. The layer thickness is 3-5 microns.

As Fig. 4 shows the side facing the intervertebral disc surface of the base plate is planar, except for the two centrally located cylindrical

Pencils. The pins have a cylindrical shape with a height of 5 mm and a diameter of 7 mm. Also, the pins are provided with a ceramic

provided coating of Ti-Nb-N. The base plate is shown rectangular, can of course also have other shapes and vary in thickness, that is, on the ventral side is thicker than on the dorsal side of his.

The intervertebral disk has a shape as shown in Fig. 2 and 3 shown. Fig. 9 shows the bottom surface of the intervertebral disc with a slightly elongated ventrally curved recess for receiving the guide pins of the base plate. Figures 2 and 8 show the top side of the intervertebral disk with its semi-cylindrical convex articulating surface configured. The articulating surface is located on a part of surface of a cylinder of radius R.

The intervertebral disk consists of UHMWPE. The facing of the top plate side of the intervertebral disc is convex and semi-cylindrical shaped and has a radius of 25 mm. The concave depression or recess of the cover plate with R = 25 mm takes the convex bulge of the intervertebral disc, also with R = 25 mm on so that a contact surface is obtained, which is located on a surface portion of a cylinder. It results in an overall contact area of about 650 mm 2. Thereby, a surface distribution of load and not point-shaped or line-shaped load distribution is achieved in the intervertebral disc.

The entire articulating surface of the concave depression or recess in the cover plate corresponds to the contact surface.

Furthermore, the intervertebral disc on its side facing the base plate an elongate slightly curved recess which is shown in FIG. 3 and 9. This recess is intended for receiving the pins of the base plate. The pins are shown in Figure 4, 5, and 8. 9 The intervertebral disc lies parallel to the lateral axis, with its longitudinal axis so that flexion, tilting or rotational movements are possible about the lateral axis in anteflexion and retroflexion but are inhibited in lateral direction.

Due to the larger diameter of the recess in the intervertebral disc relative to the diameter of the pin of the base plate, the intervertebral disc can perform limited translatory movements and minimum rotation movements on the base plate. The rotational movement is physiologically to about 1, 5

Degree limited.

The pins on the base plate have a diameter of 6 mm. The recess in the intervertebral disc has a longitudinal diameter in a lateral direction of 18 mm and in retroflexion anteflexion direction of 8 mm.

Starting from a central location, the intervertebral disc can move on the base plate in the lateral direction 2 mm or a total of 4 mm from one lateral extreme position to the other. Starting from a central location of the intervertebral disc on the base plate 1 mm in Retroflexions- direction and 1 mm in anteflexion direction or a total of 2 mm from the dorsal extreme position can move to the ventral extreme position.

In a bending movement base and cover plates can be tilted up to 20 degrees to each other.

Thus, the inventive embodiment degrees of motion permitted as with a natural vertebral segment, wherein avoided even with complex movements by the mating cylindrical faces of the intervertebral disc and cover plate load peaks on the intervertebral disc.

Claims

claims
1. intervertebral implant comprising a base plate, a cover plate and an intervertebral disc, the intervertebral disc has the shape of a half-cylinder whose longitudinal axis extends in the lateral direction.
2. intervertebral implant according to claim 1, wherein the intervertebral disc has the shape of a plano-convex semi-cylinder.
3. intervertebral implant according to claim 1 or 2, wherein the lateral ends of the intervertebral disc plan, semi conical or semi-spherical are configured.
4. intervertebral implant according to one of claims 1 - which is mounted movable in translation on the base plate 3, wherein the intervertebral disc has a flat articulating surface.
5. intervertebral implant according to claim 4, wherein the intervertebral disc has at least one recess in the flat articulating surface adapted to receive at least one on the
Base plate mounted pin or half-cylinder is used.
7. intervertebral implant according to any one of claims 1-5, wherein the cover plate has a corresponding semi-cylindrical configured to receive the articulating surface of the intervertebral disc semi-cylindrical recess.
8. intervertebral implant according to any one of claims 1-7, wherein the semi-cylindrically configured articulating surface of the intervertebral disc and the semi-cylindrically configured articulating
Surface of the cover plate have the same radius.
9. intervertebral implant according to any one of claims 1-3, wherein the intervertebral disc has a flat articulating surface, which is supported in the lateral direction to move in translation on the top plate.
10. intervertebral implant according to claim 9, wherein the intervertebral disc has at least one recess in the flat articulating surface which serves to accommodate at least one mounted on the top plate pin.
11. intervertebral implant according to any one of claims 1-3, 9 or 10, wherein the base plate has a corresponding semi-cylindrical configured to receive the articulating surface of the intervertebral disc semi-cylindrical recess.
12. intervertebral implant according to any one of claims 1-3 or 9-11, wherein the semi-cylindrically configured articulating surface of the
Intervertebral disc and the semi-cylindrically configured articulating surface of the base plate have the same radius.
13. intervertebral implant according to any one of claims 1-3, 7 or 8, wherein the intervertebral disk and the base plate are fixedly and immovably connected to each other or the intervertebral disc is incorporated in the base plate.
14. intervertebral implant according to any one of claims 1-3, 11 or 12, wherein the intervertebral disc and the cover plate are fixedly and immovably connected to each other or the intervertebral disc is incorporated in the cover plate.
15. intervertebral implant according to any one of claims 1-14, wherein the base plate and / or the cover plate made of titanium or a titanium alloy and the intervertebral disc made of polyethylene or titanium or a titanium alloy.
16. intervertebral implant according to claim 15, wherein the intervertebral disc made of titanium or a titanium alloy.
17. Use of the intervertebral implant according to any one of claims 1-16 for the treatment of scoliosis, disc herniation, kyphosis, disc rupture, Black disc, spontaneous deformation, lumbago, spondylitis deformans, hunchback, Spondylomyelitis, osteochondrosis, osteofibrosa,
Spina bifida, lordosis, Spondylotosis, Schipperkrankheit, myelomeningocele, brachialgia, Baastrup characters Wirbelankylose, Scheuermann's disease, cervical syndrome, lumbar kyphosis, torticollis and the spondylitis disease.
PCT/DE2009/001710 2008-11-30 2009-11-30 Intervertebral implant WO2010060423A2 (en)

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