Expandable and adjustable lordosis interbody fusion system

A spinal implant device for placement between vertebral bodies, this device comprising: an expandable sheath (14 and 16); at least one wedge or screw element comprising a conical configuration having an external helical thread (34-40); and at least one drive shaft (42); the expandable cover comprises an upper element and a lower element separated from each other, the lower element has at least one stepped track (18 and 20) to receive the wedge element or screw, the drive shaft is operatively engageable with the wedge element or screw to move the wedge or rotate the screw element along the stepped track, the wedge or screw element engages the upper element and the lower element, such that the upper element and the lower element move relative to each other in response to movement of the wedge or rotation of the screw element along the stepped track to effect an expansion of the deck and the stepped track It also allows the contraction of the cover by reversing the movement of the wedge or the rotation of the screw element with respect to the expansion; wherein the stepped track comprises a plurality of lift elements (52-60), a height of the individual lift elements increasing along the stepped track, such that the wedge or screw element(s) make the upper element and the lower element move away from each other to a greater degree as the wedge or screw element(s) move along the increasing height of the lifting elements; and the thread(s) of the wedge or screw element(s) are received in the spaces between the lifting elements to guide the wedge or screw element along the stepped track; and a smaller diameter of the wedge or screw element(s) engages the upper edges of the lifter elements.