| 摘要 |
A variable length cross-link device for use with orthopaedic dual rod apparatuses includes a pair of elongate elements, each having a first end which mates with a rod or pedicle screw. The first element has a second end which is narrow and extending. The second element has a second end which is wide and extending, and includes a through hole. The invention further includes a post having an upper threaded portion mounted through the hole in the second element, and a passageway in the lower portion for receiving the second end of the first element. A nut is provided onto the post. Prior to tightening of the nut, the first element is slidable relative to the post and the second element, and the post element has rotational freedom within the through hole such that the first and second elements may be angulated relative to one another. Once the nut is tightened, the first and second elements are compressibly engaged, thereby crush locking the elements together. In a first embodiment, the first ends of the elongate elements are curvate and have set screw hole to hook and lock onto the rods. In a second embodiment the first ends have eyeloops for coupling to the heads of pedicle screws. In a third embodiment, which is compatible with either of the first end configurations, the narrow and extending end of the first element is cylindrical so that the first and second ends may axially rotate relative to one another. |
