Intervertebral prosthesis
View Patent ↗An intervertebral prosthesis, in particular for the cervical spine, includes a first cover plate to be connected to a first vertebral body, a second cover plate to be connected to the second vertebral body, and a prosthesis core which forms an articulation with the second cover plate. The prosthesis core is held by a seat of the first cover plate which is designed as a guide device. The core can be pushed into the guide device from the ventral side in the anterior-posterior (AP) direction relative to the first cover plate. A limit-stop plate is provided on the ventral edge of the first cover plate. This limit-stop plate is displaceable in a slide guide between a locking position and a nonlocking position.
1. An intervertebral prosthesis, comprising a first cover plate configured to be connected to a first vertebral body, a second cover plate configured to be connected to a second vertebral body, and a prosthesis core which forms an articulation with the second cover plate and is held by a seat of the first cover plate, which seat is designed as a guide device into which the core can be moved from a ventral side relative to the first cover plate, the first cover plate having, on a ventral edge, a slide guide with respect to which a limit stop on the first cover plate is displaceable between a locking position and a nonlocking position and has a height such that the limit stop does not interfere with relative motion between the prosthesis core and the second cover plate,
wherein the slide guide is formed by a guide slot which extends transverse to the guide device and which is configured to receive the limit stop and wherein the limit stop is designed as a limit-stop plate.
2. The prosthesis as claimed in claim 1 , wherein the guide slot has a guide direction (D) extending transverse to a plane of extension of the first cover plate and the limit-stop plate, which is configured to be movable in guide direction (D) is, in its locking position, partially held in the slot and partially extends above a bottom surface of the first cover plate.
3. The prosthesis as claimed in claim 2 , wherein the guide slot is provided in the ventral edge of the first cover plate and in a securing flange arranged thereon.
4. The prosthesis as claimed in claim 2 , wherein the guide slot has at least one first screw hole passing through it, and the limit-stop plate has a second screw hole which is flush with the first screw hole when the limit-stop plate is in its locking position.
5. The prosthesis as claimed in claim 4 , wherein the limit-stop plate comprises a bendable fastening lug projecting in the guide direction of the guide slot.
6. The prosthesis as claimed in claim 2 , wherein the prosthesis core has an articulation surface that covers substantially the entire first cover plate.
7. The prosthesis as claimed in claim 4 , wherein the prosthesis core has an articulation surface that covers substantially the entire first cover plate.
8. The prosthesis as claimed in claim 2 , wherein the prosthesis core has a slot which is flush with the guide slot and receives part of the limit-stop plate.
9. The prosthesis as claimed in claim 8 , wherein the limit-stop plate comprises a bendable fastening lug projecting in the guide direction of the guide slot.
10. The prosthesis as claimed in claim 8 , wherein the prosthesis core has an articulation surface that covers substantially the entire first cover plate.
11. The prosthesis as claimed in claim 2 , wherein the limit-stop plate comprises a bendable fastening lug projecting in the guide direction of the guide slot.
12. The prosthesis as claimed in claim 1 , wherein the guide slot has a guide direction (E) extending parallel to a plane of extension of the first cover plate and transverse to an anterior-posterior direction, and the limit-stop plate can be moved in the anterior-posterior direction into the locking position.
13. The prosthesis as claimed in claim 12 , wherein the prosthesis core comprises a part which covers the limit-stop plate held in the guide slot and which prevents the limit-stop plate from leaving the guide slot transverse to guide direction (E).
14. The prosthesis as claimed in claim 13 , wherein the prosthesis core has a slot which is flush with the guide slot and receives part of the limit-stop plate.
15. The prosthesis as claimed in claim 12 , wherein the guide slot has at least one first screw hole passing through it, and the limit-stop plate has a second screw hole which is flush with the first screw hole when the limit-stop plate is in its locking position.
16. The prosthesis as claimed in claim 12 , wherein the limit-stop plate comprises a bendable fastening lug projecting in the guide direction of the guide slot.
17. The prosthesis as claimed in claim 12 , wherein the prosthesis core has an articulation surface that covers substantially the entire first cover plate.
18. The prosthesis as claimed in claim 1 , wherein the limit-stop plate comprises a bendable fastening lug projecting in the guide direction of the guide slot.
19. The prosthesis as claimed in claim 18 , wherein the prosthesis core has an articulation surface that covers substantially the entire first cover plate.