An intervertebral implant has at least one arm (14) pivotally connected to a base (10). At least one worm gear configuration includes a worm in (18) mounted within the base (10) so as to be rotatable, and a set of gear teeth (20) associated with the arm (14). When the worm (18) is rotated about its central axis, the arm (14) is driven through a range of pivotal motion relative to the base so as to change an angle of inclination between a direction of elongation (16) of the arm and the direction of elongation (12) of the base. Embodiments of the invention include devices with a hollow proximal worm allowing access into the implant via the worm, distally deployed worms, and devices with a pair of worm gear assemblies that operate synchronously or independently.

A method and system for performing bone fusion and/or securing one or more bones, such as adjacent vertebra, are disclosed.

Intervertebral implant (1) comprising (i) a first elongated implant member (20) with a longitudinal axis (221), an upper surface (222) and a lower surface (223) for apposition to the endplates of two adjacent vertebrae, and with a lateral circumferential surface (224) and (ii) a second elongated implant member (30) with a longitudinal axis (321), an upper surface (322) and a lower surface (323) for apposition to the same endplates and with a lateral circumferential surface (324). Said elongated implant members (20, 30) are rotatably coupled to a central body (10) for rotation in a central plane (101 essentially parallel to said upper and lower surfaces. Further, a) said first and second elongated implant members (.sub.20, 30) comprise each an inner end portion (225;325) which comprises a segment of a toothed wheel (220;320) with gear teeth (23;33) and with an axis of rotation (227;327) essentially orthogonal to the central plane of the intervertebral implant; and a free outer portion (226;326); and whereby said free outer portions (226;3.sub.26) of said first and second elongated implant members (20, 30) are rotatable around the axis of rotation (227;327) of the segment of a toothed wheel (220;320) of their respective inner end portions (225;325).

A spinal cage with a wall extending in a longitudinal direction defining an interior space is disclosed. There is also provided a deployable element in movable relation to the spinal cage.

A total artificial expansile disc and a method for posterior insertion between a pair of vertebral endplates are disclosed. The total artificial expansile disc includes at least one pair of substantially parallel plates that move apart along a first axis, in order to occupy a space defined by the vertebral endplates. In another embodiment, each of substantially parallel plates includes a first plate and a second sliding plate. An expansion device or tool is used to move the substantially parallel pair of plates apart along the first axis. A core is disposed between the pair of plates, and the core permits the vertebral endplates to move relative to one another. A ball limiter or ball extender prevents the core from being extruded from between the substantially parallel plates.

Devices and methods for intervertebral spinal fusion of adjacent intervertebral bodies are provided. An intervertebral spacer is positioned within a narrow disc space between adjacent intervertebral bodies of a patient. The spacer is arranged with upper and lower guides. The guides are adapted to simultaneously guide the deployment of upper and lower anchors of an anchoring device into their respective intervertebral bodies. The spacer is also adapted to lock the upper and lower anchors to the spacer in the deployed position.

A spinal implant device for placement between vertebral bodies includes a housing, at least one screw member in the housing, and at least one drive shaft operably engageable with the screw member. The housing includes a first shell member and a second shell member. At least the first shell member has step tracking comprising a plurality of individual riser members for receiving the at least one screw member. The height of the plurality of individual riser members may change along the step tracking. The drive shaft may be operable to rotate the at least one screw member, causing the at least one screw member to move on the plurality of individual riser members. The at least one screw member comprises an external helical thread having a thickness configured to fit in the gaps between adjacent individual riser members, and is engageable with the first and second shell members, whereby the first and second shell members move relative to each other in response to the rotation of the at least one screw member to effect an expansion of the housing or a contraction of the housing from the expansion by reversing the rotation of the at least one screw member.

A method and system for performing bone fusion and/or securing one or more bones, such as adjacent vertebra, are disclosed.

A unique, universal Zero-Profile Expandable Intervertebral Spacer (ZP-EIS) device for fusion and distraction throughout the entire spine is provided which can be inserted via anterior, anterolateral, lateral, far lateral or posterior surgical approaches dependent on the need and preference. Multiple ZP-EIS embodiments each with unique mechanisms of calibrated expansion are provided. Two of these embodiments incorporate bi-directional fixating transvertebral (BDFT) screws and five other embodiments do not incorporate BDFT screws. A tool for implantation into the intervertebral device and calibrated device expansion is also disclosed.

A bone graft delivery system for delivering graft material into a surgical site. The delivery system includes an elongate hollow tube constructed to receive the bone graft material and having a hollow interior and indicia formed on an exterior surface of the elongate hollow tube. The delivery system also includes a plunger adapted to extend in the elongate hollow tube and to form a substantially congruent fit with the hollow interior of the elongate hollow tube such that the plunger is precluded from rotating within the elongate hollow tube. The plunger is adapted to urge bone graft material through the elongate hollow tube to deliver bone graft material through an opening thereof.