Implant in particular for replacing a vertebral body in surgery of the spine
AssigneeStryker France
InventorsYves Crozet, Paolo Mangione
Life of this patent
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Abstract
An implant device designed for replacing a vertebral body of the spine. The implant device contains at least one moving member so as to vary the distance between a first and second member. Most preferably this movement is achieved by rotating at least one cam about an axis. The cam or cams are shaped so as to comprise an irregular polygon thus allowing the height of the implant device to be varied at discrete positions. A slidable telescopic engagement device within the implant device affords the added advantage of simple adjustment and maneuverability.
Claims20
An implant specifically for replacing a vertebral body in surgery of the spine, the implant comprising first and second bearing elements for bearing against under-and overlying vertebral plates, retaining means for retaining the two bearing elements one above the other, and at least one moving member suitable for varying the distance between said bearing elements, the retaining means comprising at least one slideway means provided between the two bearing elements, and in that the or each moving member is constituted by a cam having discrete positions suitable for being rotated about an axis that is essentially horizontal and essentially parallel to the sagittal plane wherein the or each discrete-position cam has, in cross-section, an outline in the form of an irregular polygon.
An implant according to claim 2 or 4, wherein each bearing element possesses a bearing plate having a groove formed in one face thereof, and in that at least some of the pairs of faces are dimensioned in such a manner as to be of a length in the circumferential direction of the cam that is very slightly shorter than the width of each groove.
An implant specifically for replacing a vertebral body in surgery of the spine, the implant comprising:
- a) a first bearing element and a second bearing element for bearing against underlying and overlying vertebrae;
- b) a retainer supporting one of the first bearing element and the second bearing element above the other of the first bearing element and the second bearing element;
- and
- c) at least one moving member for varying the distance between said bearing elements;
- d) the at least one moving member comprising at least one cam being rotatable about an axis that is essentially horizontal and having discrete positions with respect to the retainer.
Dependencies are inferred from the claim text.