Intervertebral implant to immobilize one vertebra relative to another

1. An intervertebral implant to immobilize one vertebra relative to another comprising:

two elongated elements of reduced width, defining, at their edges, two longitudinal surfaces opposite each other, wherein the elongated elements are positioned between vertebral plates of the vertebrate, apart from each other, with their longitudinal surfaces in contact with the vertebral plates;

wherein the elongated elements have curved shapes, having the same curvature from one elongated element to the other elongated element, and one of the elongated elements has a length smaller than that of the other elongated element, the elongated element with the smaller length being intended to be placed in an anterior position on one of the vertebral plate while the elongated element with the larger length is intended to be placed in the posterior position on this same vertebral plate;

the implant comprises connecting devices to connect one of the elongated elements to the other elongated element;

the connecting devices comprise at least one connecting member to bring one of the elongated elements closer to the other elongated members after placement; and

the connecting member comprises a connection element, the connection element is tied or twisted around the elongated elements, the connection element is able to be tensioned to bring the elongated elements closer together, the connection element including ends that are cut at the knot or twisted.

2. The intervertebral implant according to claim 1 , wherein the two elongated elements have different heights, the elongated element with the smaller length having a height greater than that of the elongated element ( 1 ) with the larger length.

3. The intervertebral implant according to claim 1 , wherein at least one of the elongated elements comprises at least one hole for the passage of the connection element through it.

4. An intervertebral implant to immobilize one vertebra relative to another comprising:

two elongated elements of reduced width, defining, at their edges, two longitudinal surfaces opposite each other, wherein the elongated elements are positioned between vertebral plates of the vertebrate, apart from each other, with their longitudinal surfaces in contact with the vertebral plates;

wherein the elongated elements have curved shapes, having the same curvature from one elongated element to the other elongated element, and one of the elongated elements has a length smaller than that of the other elongated element, the elongated element with the smaller length being intended to be placed in an anterior position on one of the vertebral plate while the elongated element with the larger length is intended to be placed in the posterior position on this same vertebral plate;

the implant comprises connecting devices to connect one of the elongated elements to the other elongated element;

the connecting devices comprise at least one connecting member to bring one of the elongated elements closer to the other elongated members after placement;

the connecting member comprises a connection element, the connection element is tied or twisted around the elongated elements, the connection element is able to be tensioned to bring the elongated elements closer together, the connection element including ends that are cut at the knot or twisted;

each one of the elongated elements comprises a hole on each end, a first end of the connection element passes through the holes of one of the elongated elements and then through the holes of the other elongated element and then is secured to a second end of the connection element.

5. The intervertebral implant according to claim 1 wherein at least one of the elongated elements comprises asperities on at least one of its curved longitudinal surfaces, the asperities are in a form of series of dots of pyramidal shape or of ribs.

6. The intervertebral implant according to claim 1 wherein one of the elongated elements comprises at least one rib protruding from at least one of its curved surfaces.

7. An intervertebral implant to immobilize one vertebra relative to another comprising:

two elongated elements of reduced width, defining, at their edges, two longitudinal surfaces opposite each other, wherein the elongated elements are positioned between vertebral plates of the vertebrate, apart from each other, with their longitudinal surfaces in contact with the vertebral plates;

wherein the elongated elements have curved shapes, having the same curvature from one elongated element to the other elongated element, and one of the elongated elements has a length smaller than that of the other elongated element, the elongated element with the smaller length being intended to be placed in an anterior position on one of the vertebral plate while the elongated element with the larger length is intended to be placed in the posterior position on this same vertebral plate;

the implant comprises connecting devices to connect one of the elongated elements to the other elongated element;

the connecting devices comprise at least one connecting member to bring one of the elongated elements closer to the other elongated members after placement, the connecting element is a cord;

the connecting member comprises a connection element, the connection element is tied or twisted around the elongated elements, the connection element is able to be tensioned to bring the elongated elements closer together, the connection element including ends that are cut at the knot or twisted;

each one of the elongated elements comprises a hole on each end, a first end of the connection element passes through the holes of one of the elongated elements and then through the holes of the other elongated element and then is secured to a second end of the connection element.