Implant, in particular front cervical plate
First Claim
1. An implant for osteosynthesis of the spine, comprising a plate having one end configured for attachment to a first vertebra and a second end configured for attachment to a second vertebra with the aid of bone fixation screws, said plate having first and second receiving elements, each element including a body portion with at least one hole for the bone fixation screws, each of the first and second element body portions being able to slide relative to the other in a direction corresponding to a closing together or distancing of the two vertebrae relative to one another and said first and second elements each being provided with means associated with each element for selectively allowing the free sliding of said elements or locking the said elements in a position chosen from among a plurality of positions in said direction defined by the mutual sliding engagement between the said elements.
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Accused Products
Abstract
The invention relates to a plate designed to be fixed with bone fixing screw to two vertebrae. The invention is characterized in that the plate comprises two elements each including at least one hole for a bone fixing screw, each of the elements capable of sliding relative to the other in a direction bringing them closer to or spacing them from the vertebrae relative to each other. The elements are provided with a screw and slot for limiting the mutual sliding travel between them to lock the elements in a given mutual position. The invention is in particular applicable to cervical plates to be implanted from the front of the spine.
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Citations
21 Claims
- 1. An implant for osteosynthesis of the spine, comprising a plate having one end configured for attachment to a first vertebra and a second end configured for attachment to a second vertebra with the aid of bone fixation screws, said plate having first and second receiving elements, each element including a body portion with at least one hole for the bone fixation screws, each of the first and second element body portions being able to slide relative to the other in a direction corresponding to a closing together or distancing of the two vertebrae relative to one another and said first and second elements each being provided with means associated with each element for selectively allowing the free sliding of said elements or locking the said elements in a position chosen from among a plurality of positions in said direction defined by the mutual sliding engagement between the said elements.
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18. A method of attaching a plate to two vertebrae, said plate intended to be fixed to the two vertebrae with the aid of bone fixation screws, the plate comprising first and second elements, each including at least one hole for a bone fixation screw, each of the elements being able to slide relative to the other in a direction corresponding to a closing together or distancing of the vertebrae relative to one another, and each of said elements being provided with a separate means for selectively allowing free sliding of said first element with respect to said second element and for selectively locking said elements in a mutual position from among a plurality of positions defined in a given course of the mutual sliding engagement between said first and second elements, the method comprising:
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placing bone graft between the two vertebrae to be treated;
fixing the plate to the two vertebrae, by attaching said first and second element to respective vertebrae with the aid of said screws, in a position in which the two elements occupy a first mutual position adapted to the existing spacing between the two vertebrae;
exerting on the two vertebrae a movement which moves them toward one another, tending to compress the bone graft, this movement displacing, by sliding motion, the two elements from their first mutual position; and
locking the two elements relative to one another by actuation of said separate selective locking means when the desired distance between the vertebrae, corresponding to a second mutual position of the elements, has been reached.
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19. A kit of plates for connecting a pair of vertebrae comprising:
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a plurality of first elements each having at least one bone screw receiving hole at a first end and an oblong slot at a second end;
a plurality of second elements for sliding engagement with said first element at least in the area of said slots and having at least one bone screw receiving hole at a first end thereof and an oblong slot at a second end; and
locking elements for extending through each of said slots in said first and second elements and into engagement with a corresponding one of said first and second elements for preventing said sliding engagement between said first and second elements. - View Dependent Claims (20, 21)
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Specification