Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
  • A61F2/442—Intervertebral or spinal discs, e.g. resilient
  • A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
  • A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
  • A61F2002/30387—Dovetail connection
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
  • A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
  • A61F2002/3039—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove with possibility of relative movement of the rib within the groove
  • A61F2002/30392—Rotation
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
  • A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
  • A61F2002/3039—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove with possibility of relative movement of the rib within the groove
  • A61F2002/30397—Limited lateral translation of the rib within a larger groove
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
  • A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
  • A61F2002/3039—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove with possibility of relative movement of the rib within the groove
  • A61F2002/30398—Sliding
  • A61F2002/304—Sliding with additional means for limiting said sliding
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
  • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
  • A61F2002/30517—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a locking plate
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30565—Special structural features of bone or joint prostheses not otherwise provided for having spring elements
  • A61F2002/30571—Leaf springs
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30576—Special structural features of bone or joint prostheses not otherwise provided for with extending fixation tabs
  • A61F2002/30578—Special structural features of bone or joint prostheses not otherwise provided for with extending fixation tabs having apertures, e.g. for receiving fixation screws
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
  • A61F2002/30616—Sets comprising a plurality of prosthetic parts of different sizes or orientations
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
  • A61F2002/30649—Ball-and-socket joints
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
  • A61F2002/30649—Ball-and-socket joints
  • A61F2002/3065—Details of the ball-shaped head
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
  • A61F2/442—Intervertebral or spinal discs, e.g. resilient
  • A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
  • A61F2002/443—Intervertebral or spinal discs, e.g. resilient made of articulated components having two transversal endplates and at least one intermediate component
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
  • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
  • A61F2310/00005—The prosthesis being constructed from a particular material
  • A61F2310/00011—Metals or alloys

Definitions

• Intervertebral prostheses are used to replace the intervertebral disc. They consist of two cover plates whose outer surfaces are designed for connection to adjacent vertebral bodies, and a joint device enclosed by the cover plates.
• the upper cover plate forms a concave-spherical articular surface on its inner surface, which cooperates with the convex-spherical upper surface of a polyethylene prosthesis core to form a hinge.
• the flat bottom and the edge of the core are suitably received in a seat formed by the lower cover plate.
• This seat consists of a flat floor surface and an upstanding edge surrounding it on three sides (laterally and dorsally).
• a detent stop is provided in the known prosthesis of this type (FR-A-2 718 635, WO 01/01893).
• This consists of cooperating projections and recesses in the underside of the prosthesis core on the one hand and the bottom surface of the seat on the other.
• the seat made of flexible plastic material In order for these to engage with one another when the prosthesis core is pushed into the seat, the seat made of flexible plastic material must deform elastically before the locking of these elements. This has the disadvantage that the locking is in principle uncertain, because it can be solved by a corresponding elastic deformation of the prosthesis core again. Although it is possible to increase the safety of rest, by the prosthetic core requires the greatest possible deformation resistance.
• the invention is therefore an object of the invention to provide an intervertebral prosthesis of the type described, in which the prosthesis core is held securely in the prosthesis and the operation is not difficult.
• the seat In order to allow the prosthesis core the AP movement, which is required for insertion into the seat, the seat is designed as a guide device with a direction extending in the AP direction.
• This can be formed by mutually opposite, parallel, lateral guide rails, between which the core is held so that it can only move in the AP direction.
• the guide rails are expediently undercut in order to interact with a strip of the core engaging in the undercut. In this way it is prevented that the core stands out from the cover plate holding it.
• This has the advantage that the devices provided for limiting the core movement need not be very high and therefore there is no danger that they could obstruct the relative movement of the cover plates in relation to each other.
• the dorsal movement stop is expediently rigidly connected to the cover plate forming the seat (ie the guide rails).
• a movement stop is provided, which is removable from its blocking position, so that it is easier to insert the core after implantation of the cover plate. Subsequently, the stop is fixed in the position in which it prevents the escape of the core.
• a sliding guide is provided, in or on which the stop between a locking position and a non-locking position is displaceable.
• the sliding guide is formed by a guide slot running transversely to the guide device, which receives the stop formed as a stop plate.
• the guide slot may have a transverse to the plane of extension of the cover plate extending guide direction. That is, the stopper plate is in its locking position to a part in the slot and is held by this and protrudes to another part on the bottom surface of the seat to hold the prosthesis core in the seat. In the non-locking position, it is lowered under the bottom surface of the seat into the slot or removed therefrom entirely up or down.
• the guide slot may also have a parallel to the extension plane of the first cover plate and transverse to the AP direction extending guide direction. In this case, the stopper plate is inserted from the side into the guide slot to get into the locking position.
• the stop plate is traversed by a fixing screw, so that the stop plate can only be removed from the securing position, if previously the screw has been removed.
• the guide slot is traversed by at least one screw hole and has the stop plate in its locking position so aligned screw hole. This embodiment is particularly advantageous when the guide slot is located in a mounting flange which is provided on the ventral edge of the cover plate forming the seat.
• the prosthesis core has a part which covers the stop plate contained in the guide slot.
• This cover may be formed as a slot in the prosthetic core, which is aligned with the guide slot when the prosthesis core has reached the intended position in the seat.
• the guide slot in the cover plate on the one hand and the aligned slot in the prosthetic core on the other hand form then a receptacle for the stop plate, in which it can be easily inserted from the side.
• stop plate has an easily bendable securing nose projecting beyond the guide slot in the blocking position in the direction of the guide slot. This is bent by the surgeon after insertion so that it protrudes from the plane of the stop plate and thereby makes the return movement in the guide slot impossible.
• the stop plate is not translationally transferred from the non-blocking position into the blocking position, but by a pivoting movement.
• the sliding guide which receives the stopper plate is formed by a sliding guide surface extending transversely to the AP direction on the ventral edge of the cover plate and a pivoting pin extending therefrom, on which the stopper plate is pivotably mounted.
• the stop plate has a tongue which protrudes in a blocking pivot position of the stop plate on the bottom surface of the seat and thus prevents the escape of the prosthesis core from the seat. In the non-locking position, this stop tongue is lowered below the bottom surface of the seat.
• the Gleitmentsflache on which the stop plate is held is suitably formed by the end face of a mounting flange. This also contains at least one screw hole in the vicinity of the pivot pin.
• Screw can be used by using a wing over the located in the screw hole screw head engages.
• the stop according to the invention is not only suitable for those cases in which the prosthesis core assumes a fixed immovable position in the seat, but also for those cases in which it has freedom of movement, in particular in the body
• the guide means for the prosthesis core formed by the seat is then used not only for its insertion movement but also for a constant mobility.
• This can be advantageous, in particular in cervical prostheses, in which the articular surface of the prosthesis core extends over substantially the entire cover plate. In these cases, one would like to keep the radius of curvature of the joint surface small in order to keep the overall height of the prosthesis low. In such cases, AP mobility of the prosthetic nucleus may improve the approach of the prosthesis flexural properties to natural conditions.
• a particular aspect of the inventive concept is therefore that within a system of intervertebral prostheses, in addition to those having this AP mobility, other prostheses preferably having matching outer shape are present which show no AP mobility between the prosthesis core and the cover plate holding it. This allows the physician to decide intraoperatively if he wants to provide AP mobility or not. Conveniently, the cover plates of in
• AP direction movable or immovable prostheses consistently shaped and only the core is different.
• the prosthesis core and the cover plate forming it with the joint coincide in all types, while the AP mobility is due to the difference in the cover plate holding the prosthesis core.
• all three components coincide and only the one stop, which ventrally limits the path of the prosthesis core in the AP direction, is located differently.
• Fig. 2 a sagittal section
• Fig. 3 is a decomposition diagram of a first embodiment
• Fig. 4 shows a variant of the first embodiment
• Fig. Fig. 6 is a decomposition diagram of a second embodiment
• Fig. 7 shows the second embodiment with converted stop plate; F fiigg. 8 8 and 99 two sagittal sections acc. the cutting lines
• FIG. 10; 10 and 11 are two perspective views of the third embodiment and Figure 12 shows the stop plate of the third embodiment.
• Fig. 13 is a decomposition diagram of a fourth embodiment and Fig. 14 shows a variant of the lower cover plate of the fourth embodiment.
• the lower cover plate 1 and the upper cover plate 2 of the first embodiment have outer surfaces 3 and 4, respectively, which are intended for anchoring to the associated vertebral body. They are preferably flat. But there are also other substantially flat designs including suitable surface structures for better anchoring to the bone conceivable.
• the cover plates are preferably made of metal.
• the lower cover plate 1 applies to the upper cover plate 2 to a flat bottom surface 5, which is bordered on three sides by a collar 6, which forms an inwardly projecting bar 7 above an inner undercut.
• the lower cover plate 1 is oval or rectangular in plan view.
• the bottom surface 5 and the collar 6 of the lower cover plate 1 form a seat for the prosthesis core 10, which consists of lubricious material, such as polyethylene. He has a matching to the bottom surface 5 planar lower surface which is bounded laterally and dorsally by a skirt 11, above which a groove 12 is located.
• the strip 11 engages in the undercut of the collar 6 below the bar 7.
• the bar 7 engages in the groove 12 a.
• the core 10 has on all sides substantially the same outline shape in the plan view as the lower cover plate 1 and the upper cover plate 2. It covers in particular the collar 6, so that the size of the provided from the top of the core sliding surface 22 by the presence of the collar 6 is not reduced.
• the collar 6 may be made small in relation to the height of the core 10. Nevertheless, the core can not escape the gap between the cover plates 1 and 2, because it is prevented by the interaction of the undercut strips 7 and 11 at the lifting of the cover plate 1.
• the cover plates 1, 2 each have an approximately perpendicular projecting from them mounting flange
• the screw holes 17 for attachment to the vertebral body contains.
• a slot 18 which forms a sliding guide for a stop plate 14 which is slidably held therein. It can take the locking position shown in Fig. 2, in which it forms a stop for the forward movement of the core 10. It can also be shifted down into the slot 18 or removed altogether from it, that the prosthesis core can be easily inserted from ventral into the seat of the lower cover plate and between the cover plates.
• It contains two holes 19, which are aligned in the blocking position with the screw holes 17.
• the dorsal part 21 of the collar 6 acts as a safety stop, which prevents escape of the core in the dorsal direction from the space between the cover plates 1 and 2.
• the presence of the undercut on the collar 6 and on the edge of the core 10 is important for the guiding function only in the lateral regions 8 and 9 of the lower cover plate 1 and the core 10, but not in the dorsal course 21 of the collar 6.
• the core 10 On the upper side, the core 10 has a preferably convex spherical joint surface 22, which interacts with the underside, concave-spherical sliding surface 23 of the upper cover plate 2 to form a joint.
• Fig. 4 shows a variant in which the prosthesis core 10 ventral (in Fig. 4 right) a little shorter than the lower cover plate, so that between its ventral end surface 13 and de stop 14 game remains when the prosthesis core is in its widest dorsal position.
• the size of this game allows the core 10 in the mounted state in the AP direction.
• the upper cover plate 2 pivots the upper cover plate 2 in relation to the lower cover plate 1 in the view of FIG. 4 a little clockwise and at opposite to the stretching movement.
• Kerns and the cover plate can be left in the lateral direction so much game that in this direction, a certain relative movement is possible.
• the degree of movement play in the AP direction is preferably between one and four, more preferably on the order of two to three millimeters, in the case of a cervical prosthesis. If lateral relative movement is foreseen, their extent should not exceed two millimeters.
• the cover plates 1, 2 each have a right angle projecting from them flange 15, 16 which contains screw holes 17 for attachment to the vertebral body.
• a stop plate 28 On the flange 15 of the lower cover plate 1 is centrally between two fferenlö- 17, a stop plate 28 rotatably secured by a head bolt 29.
• the plane in which it can rotate slidably is determined by the front surface of the mounting flange 15, which is therefore referred to as a sliding guide surface.
• the stopper plate has two wings 30 extending substantially to the side and a tongue 31 extending transversely thereto. It is made of resilient metal and is biased so that its wings 30 press against the Gleitmentsflache.
• a turning tool for example a screwdriver
• it contains a suitable opening or recess 32.
• the core 10 can therefore be inserted unhindered into the insertion guide formed by the collar 6. If it is rotated by 180 °, as shown in Figs. 5 and 7, the tongue 31 projects over the surface 5 and thereby forms a stop which prevents the core 10 from leaving the guide to the ventral side.
• the stopper plate 28 leaves the screw holes 17 for mounting the mounting screws free.
• tongue 31 of the stop plate 28 and the opposing surface 13 of the core 10 may - as indicated in Fig. 7 - are a free space of a few millimeters.
• the core 10 can move in the guide formed by the lateral sections 8, 9 of the collar 6 by a certain distance in the AP direction (see the description of FIG. 4). If this movement play is not desired, the free space between the surface 13 and the stop 14 is reduced to zero, as assumed in FIG. 6.
• a slot 40 is cut, which in the left half of the flange 15 in FIG. 10 passes completely from top to bottom and in the right part of the flange 15 from the line shown in FIG 41 is limited.
• the slot 40 opposite a slot 42 aligned with the slot 40 is cut into the bottom of the prosthesis core 10.
• the two slots 40, 42 serve to receive a stop plate 43 whose outline is approximately equal to the boundaries of the space intended for its reception, which is formed by the slots 40, 42. As shown in FIG. 10, it can be inserted into the slots 40, 42 from the side after insertion of the prosthesis core 10.
• the stop plate 43 may be provided at the end with a nose 44, which after the complete insertion of the stop plate 43 in the slots 40, 42 on the right side (see Fig. 11) looks out and can be bent to secure the stop plate.
• the flange 15 has screw holes 17 which serve to secure the lower cover plate 1 to the associated vertebral body. In the left part (see Fig. 10), the screw hole 17 there traverses the slot 40 which extends there over the entire height of the flange 15 to receive the left wide wing 45 of the stopper plate.
• This wide wing 45 of the stopper plate also includes a screw hole 46 that, when the stopper plate 43 is inserted (Figs. 9 and 11) is aligned with the screw hole 17 there. If a fixing screw is in this screw hole, the stopper plate 43 can not escape from its securing position.
• the screw hole 46 and the nose 44 form mutually independent securing devices. It is therefore not necessary that always both are provided. If the screw hole 46 is present, the nose 44 may be missing. If the nose is provided, the wide wing 45 of the stop plate below the line 47 and the corresponding part of the slot in the mounting flange 15 may be missing. It then suffices a stop plate, which extends above the dot-dash line 47 (Fig. 12). In order that the stop plate can not escape to the right from the receiving slot 40, 42 in this case, a securing nose (not shown) corresponding to the nose 44 can also be provided on the left end of the stop plate 43. Upwards, the stop plate 43 can not escape, because it is covered by that part of the prosthesis core 10, which forms the slot 42.
• the fourth embodiment according to FIGS. 13 and 14 illustrates an alternative embodiment for the seat, which is formed on the lower cover plate 1 for the prosthesis core 10.
• the prosthesis consists of a lower cover plate 51 and an upper cover plate
• the lower cover plate has an upper, flat bottom surface 53, on which the prosthesis core 54 rests. While this core is guided at its outer edges in the previously explained embodiments, in the fourth embodiment it has a recess 55 with undercut inner edges 56 which cooperate with an elongate projection 57 of the lower cover plate with correspondingly undercut edges 58.
• the core 54 is thereby - as explained with reference to the first embodiment - guided in the AP direction movable relative to the lower cover plate 51. In addition, it is protected by the cooperating undercuts against lifting from the lower cover plate. Not shown stops are provided which prevent the dorsal and ventral slipping out of the prosthesis core from the plate gap.
• the lower cover plate 51 can be replaced by the lower cover plate 51a shown in FIG. 14, which differs from the lower cover plate 31 in that its projection 57a is not elongate, but is circularly limited in plan view.

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• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Neurology (AREA)
• Orthopedic Medicine & Surgery (AREA)
• Heart & Thoracic Surgery (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Transplantation (AREA)
• Cardiology (AREA)
• Vascular Medicine (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Prostheses (AREA)
• Medicines Containing Material From Animals Or Micro-Organisms (AREA)

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