A device for insertion into a spinal (intervertebral or intravertebral) space is expandable and contractable. The device includes a body assembly, a top member configured to fit within a gap in the body assembly, a drive gear disposed within the body assembly at a distal end of the body assembly, a proximal gear assembly, and a distal gear assembly. The drive gear includes a receiver accessible from outside the body assembly and configured to be rotated in order to rotate the drive gear. Each gear assembly is attached to the top member. The distal gear assembly engages the drive gear. Rotation of the drive gear in a first direction causes the gear assemblies to translate the top member away from the body assembly, and rotation of the drive gear in a second direction causes the gear assemblies to translate the top member towards the body assembly.

An expandable spinal fusion implant including a housing, upper and lower endplates, a wedge positioned within the housing and between the upper and lower endplates and a drive mechanism to urge the wedge distally between the upper and lower endplates to increase the separation between the endplates and expand the overall height of the distal end of the implant.

The present invention provides a supporting member for implanting into a vertebra of a subject, including: a hollow body including an upper surface and a lower surface opposite the upper surface; a first guiding part formed on the upper surface; a second guiding part corresponding to the first guiding part and formed on the lower surface; a first engaging part formed on the upper surface; and a second engaging part corresponding to the first engaging part and formed on the lower surface; wherein the second guiding part extends out an extending part from a side of the hollow body, and the extending part is configured to be slidably coupled to a first guiding part of another supporting member sliding to the lower surface of the supporting member, as a result two supporting members are slidably coupled to each other and engaged to each other. According to the invention, one single supporting member can be implanted into a vertebra of a subject, or two or more supporting members can be in sequence introduced into a vertebra of a subject and combined together therein.

An intersomatic cage, an intervertebral prosthesis, an anchoring device and an instrument for implantation of the cage or the prosthesis and the anchoring device are provided. An intersomatic cage or an intervertebral prosthesis fit closely to the anchoring device, which includes a body of elongated shape on a longitudinal axis, of curved shape describing, along the longitudinal axis, an arc whose dimensions and radius of curvature are designed in such a manner that the anchoring device may be implanted in the vertebral plate of a vertebra by presenting its longitudinal axis substantially along the plane of the intervertebral space, where the anchoring device is inserted, by means of the instrument, through a slot located in at least one peripheral wall of the cage or on at least one plate of the intervertebral disc prosthesis to penetrate into at least one vertebral plate.

Systems for improved methods of performing a spinal fusion procedure that include an implant having an alignment guide system. The alignment guide system may include one or more guide lines configured to provide a visual indication when the implant is properly aligned within the disc space. In some embodiments, the system includes one or more tamp levelers that also aid with the proper alignment of the implant within the disc space.

An artificial intervertebral disc is configured to be inserted between adjacent human vertebrae. The artificial intervertebral disc includes a first connection block, a joint block and a second connection block. The joint block has a convex surface and a rear surface. The rear surface of the joint block is stacked on the first connection block. The second connection block is slidably stacked on the convex surface of the joint block, such that the second connection block is movable relative to the first connection block. In addition, the convex surface is a curved surface, and the convex surface is arranged off-axis with respect to the rear surface.

In some embodiments, an intervertebral implant may include a body including a superior and an inferior surface. The implant may include a first channel extending from an anterior end towards the posterior end of the body. The implant may include a first anchor channel. The implant may include a first guide member positionable in the first channel. The implant may include a first anchor. When the first guide member moves from a first position to a second position the first anchor may be conveyed through the first anchor channel and couple the body to an adjacent vertebra. In some embodiments, the implant may include a first locking mechanism which inhibits, during use, the first guide member from moving from the second position to the first position upon activation of the first locking mechanism.

Expandable fusion devices, systems, and methods. The expandable fusion device includes one or more integrated deployable retention spikes configured to resist expulsion of the device when installed in the intervertebral disc space. The implant may include upper and lower main endplates, an actuator assembly configured to cause an expansion in height of the upper and lower main endplates, and a sidecar assembly including a sidecar carrier, an upper carrier endplate engaged with an upper spike, and a lower carrier endplate engaged with a lower spike such that forward translation of the sidecar carrier pushes against the upper and lower carrier endplates, thereby deploying the upper and lower spikes.

Vertebral cage assembly techniques are disclosed. In some embodiments a vertebral cage assembly may include a front wall that includes a first opening, a top wall that includes at least one top growth opening, and a bottom wall that includes at least one bottom growth opening. The vertebral cage assembly may be expandable in a lateral direction.

A system for spinal surgery includes a prosthesis comprising a plurality of bone anchors which engage an intervertebral construct for fusion or motion preservation. The fusion construct comprises a spacer optionally encircled by a jacket. The motion preservation construct may comprise an articulating disc assembly or an elastomeric disc assembly. Any of the constructs may occupy the intervertebral disc space between adjacent vertebrae after removal of an intervertebral disc. The anchors slidingly engage the construct to securely fix the prosthesis to the vertebrae. The anchors and jacket of the fusion construct provide a continuous load path across opposite sides of the prosthesis so as to resist antagonistic motions of the spine.