Vertebral cage device with modular fixation
Intervertebral arthrodesis for insertion in an intervertebral space separating opposite faces of two adjacent vertebrae has a ring shaped intervertebral cage having a bar that extends perpendicular to the axis of the spine. The bar has a height less than the rest of the cage. A surface of the cage contacting the vertebrae has an undulating shape for limiting sliding of the cage in a plane parallel to the vertebrae faces.
1. A rigid, elongated anchor for an intervertebral device comprising:
an insertion end having a projection part configured for insertion into a vertebra;
a retention end having at least one protuberance configured to retain the anchor to the device; and
a tongue-like body between the insertion end and the retention end.
2. The anchor of claim 1 in which the projecting part comprises a V-shaped tongue.
3. The anchor of claim 2 in which reliefs forming teeth are disposed along the tongue-like body.
4. The anchor of claim 3 in which the at least one protuberance is configured to clip to an intervertebral device.
5. The anchor of claim 1 comprising plural projecting parts.
6. The anchor of claim 5 in which the plural projecting parts comprise V-shaped tongues.
7. The anchor of claim 6 in which reliefs forming teeth are disposed along the tongue-like body.
8. The anchor of claim 1 in which the projecting part is sharpened.
9. An intervertebral implant device, the device comprising:
an elongated receptacle configured to receive from an edge of the device an elongated, rigid anchor having a tongue-like body and to project a vertebral insertion end of the anchor from an upper or lower side of the device; and
a housing configured to receive a protuberance on the anchor and hold the device against the anchor.
10. The intervertebral device of claim 9 in which the elongated receptacle is further configured to project the vertebral insertion end of the anchor from an upper or lower side of the device at an acute angle to said upper or lower side of the device.
11. The intervertebral device of claim 10 in which a wall of the elongated receptacle is formed at least in part by a thinned-down portion of an edge of the device.
12. The intervertebral device of claim 11 further comprising teeth on a surface along one or both of the upper and lower sides of the device.
13. The intervertebral device of claim 12 in which at least a portion of the device is made of a radiotransparent material.
14. The intervertebral device of claim 13 further comprising a radio marker.
15. The intervertebral device of claim 9 comprising plural elongated receptacles.
16. The intervertebral device of claim 9 having edges of nonuniform height.
17. The intervertebral device of claim 9 in which the receptacle comprises a stop for abutment of a retention end of the anchor.
18. A combination comprising the anchor and the implant of claim 9 , in which the implant further comprises a stop for abutment of the retention end of the anchor.
19. The combination of claim 18 in which the anchor comprises plural projecting parts forming a V-shaped tongue.
20. The combination of claim 18 in which reliefs forming teeth are disposed along the tongue-like body.