Bone structural device

1. A bone structural device comprising:

a plurality of bone structural segments, wherein adjacent bone structural segments are pivotally connected to one another about a pivot axis, and said bone structural segments are expandable in height, which is in a direction generally along said pivot axis; and

a screw drive operably coupled to the bone structural segments, wherein rotation of the screw drive imparts simultaneous expansion of the bone structural segments.

2. The bone structural device according to claim 1 , wherein at least some of said bone structural segments are expandable to different heights.

3. The bone structural device according to claim 1 , wherein said bone structural segments are made of a resorbable, tissue-compatible material.

4. The bone structural device according to claim 1 , wherein said bone structural segments are linked to each other by one or more multidirectional hinges.

5. The bone structural device according to claim 1 , wherein said bone structural segments are movable after installation in a body.

6. The bone structural device according to claim 1 , wherein said bone structural segments comprise a pair of parallel support plates.

7. The bone structural device according to claim 1 , further comprising a wedge operatively coupled to the screw drive and configured to simultaneously expand the bone structural segments.

8. The bone structural device according to claim 1 , wherein said bone structural segments are expandable by an intermediate jacking mechanism.

9. The bone structural device according to claim 8 , wherein the screw drive includes a jacking mechanism comprising at least one set of hinged flaps, wherein the screw drive is coupled to said hinged flaps, and wherein the hinged flaps are raised and lowered by the screw drive.