An instrument includes a sleeve extending between proximal and distal ends. The sleeve defines a passageway. The distal end defines an engagement portion including an engagement surface extending from a first end to a second end. A peg extends outwardly from the first end. An opening that is in communication with the passageway extends through the second end. A knob is coupled to the proximal end. A shaft includes a proximal end and an opposite distal end. The distal end of the shaft includes a mating portion. The mating portion extends through the opening. The proximal end of the shaft is coupled to the knob. The knob is rotatable relative to the sleeve to rotate the shaft relative to the sleeve. Methods of use are disclosed.

A device includes a core having proximal and distal ends and defining a first female thread. A drive screw includes first and second ends. The first end includes a first male thread. The second end including a second male thread that engages the first female thread. A first body includes a second female thread that engages the first male thread. A second body is coupled to the drive screw. A first plate is coupled to the core and the first body. The first plate includes a first vertebral engaging surface. A second plate is coupled to the core and includes a second vertebral engaging surface. The drive screw is configured to rotate relative to the core to simultaneously pivot the first plate relative to the core and alter a distance between the first vertebral engaging surface and the second vertebral engaging surface.

A device includes a core defining first and second female threads. A first member includes a first body and a first drive screw coupled to the first body, the first drive screw being configured to engage the first female thread. A second member includes a second body and a second drive screw coupled to the second body, the second drive screw being configured to engage the second female thread. A first plate is coupled to the core and the first body. The first plate includes a first vertebral engaging surface. A second plate is coupled to the core and the second body. The second plate includes a second vertebral engaging surface. The drive screws are configured to independently rotate relative to the core to pivot the first plate relative to the core and to alter a distance between the first vertebral engaging surface and the second vertebral engaging surface.

The present invention relates to an intervertebral fusion device (10) comprising a superior component (12), an inferior component (14) and a core component (16). The superior component (12) and the inferior component (14) are receivable in an intervertebral space between first and second vertebrae with the core component (16) insertable between the superior and inferior components to determine a separation between the superior and inferior components. A bone graft conveying aperture is defined in at least one of a superior component top surface (18) of the superior component and an inferior component bottom surface (20) of the inferior component. The core component defines a bone graft material holding space which is enclosed except at at least one of a core component top surface and core component bottom surface of the core component and a bone graft material delivery opening. The bone graft material delivery opening extends from outside the core component side to the bone graft material holding space. The bone graft material delivery opening is closed by a closure component.

The present invention relates to an intervertebral fusion device (10) comprising a superior component (20), an inferior component (40), and a core component (80) inserted there between. The intervertebral fusion device further comprises first and second retention mechanisms which resist ejection of the core component from between the superior and inferior components. Each of the first and second retention mechanisms comprises first and second portions. One of the first and second portions is unitary with one of the superior and inferior components. The other of the first and second portions is unitary with the core component. The first and second portions each comprise an inter-engaging formation which are urged in an opposite direction. The first inter-engaging formation is urged to inter-engage with the second inter-engaging formation upon insertion of the core component between the superior and inferior components.

The present invention relates to an intervertebral fusion device (10) comprising a superior component (20), an inferior component (40) receivable in an intervertebral space between first and second vertebrae, with the core component (80) insertable between the superior and inferior components to determine a separation between the superior and inferior components. The superior, inferior components and core components comprise respective formations and profiles. The formations (54, 68) present a barrier to separation of the core from one of the inferior and superior components during insertion of the core component. The profiles guide the core component during insertion of the core component while presenting no barrier to separation from each other during its insertion. The components comprise further formations (39, 76) which present a barrier to separation of the components from each other once the core has been fully inserted between the inferior and superior components.

A spinal fixation system includes an expandable disc replacement body and an adjustment mechanism. The expandable disc replacement body includes a first wall, a second wall, a hinge connecting the first wall and the second wall, and a first bone-screw receiving section at a proximal end of the first wall. The adjustment mechanism is positioned between the first wall and the second wall, and an angle between the first wall and the second wall can be varied by movement of the adjustment mechanism.

A variety of expandable cage improvements are provided. The cages can have a width expansion assembly that operates independently of a height expansion assembly and the wedges and ramps do not need to make contact with each other. Wedges, or movable spacers with pivotal link connections, can be used, and any portion of the cage can be expanded in width or in height in an amount that differs from other portions of the cage to provide any of a multitude of desired cage shapes. Interdigitating fingers, slidable and/or pivoting, are provided to distribute stresses over a vertebral endplate as desired.

An interbody implant can comprise a cage and a porous structure. The cage can comprise an anterior segment, a medial segment, a posterior segment and a lateral segment contiguously connected to each other to define an interior space. The porous structure can be located in the interior space and can be bounded by the cage. The porous structure can comprise opposed superior and inferior surfaces exposed through the cage, an internal cavity located in an interior of the porous structure, and a plurality of ports connecting the internal cavity to the superior and inferior surfaces. A superior-inferior stiffness of the interbody implant can be defined by the porous structure. The porous structure can be compressed within a patient by movement of the spine to biologically stimulate bone growth in vertebrae adjacent the interbody implant. The implant can be configured for lateral, anterior and posterior insertion at different spine levels.

A prosthetic intervertebral spacer includes a body having a front end, a rear end, an anterior side, a posterior side, a top surface, and a bottom surface, and an arcuate interface extending away from the body and being connected to the rear end and the posterior side of the body. A method of inserting and positioning the spacer includes engaging a tool to the interface, inserting the spacer at least partially into the intervertebral disc space by moving the tool along an insertion direction, and allowing the spacer to rotate with respect to the insertion direction within the intervertebral disc space while continuing to move the tool along the insertion direction.