A minimally invasive intervertebral implant includes a circuitous body defining a luminal axis extending longitudinally therethrough. The circuitous body includes proximal and distal ends oppositely disposed along a lateral axis of the circuitous body. Each of the proximal and distal ends includes an aperture disposed therethrough such that the circuitous body includes a first configuration wherein the proximal and distal ends are at a maximum separation and a second configuration wherein the proximal and distal ends are closer together than in the first configuration.

An interbody device may include a main body and an arm movably connected thereto. The device may have a first end, a second end opposite the first end in a direction of a longitudinal axis of the device, a first side, a second side opposite the first side in a direction of a first transverse axis of the device, a third side, and a fourth side opposite the third side in a direction of a second transverse axis of the device. An overall distance between the first side and the second side may increase along at least a majority of a length of the device in a direction from the first end toward the second end, and an overall distance between the third side and the fourth side may increase along at least a majority of the length in a direction from the second end toward the first end.

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.

Expandable fusion devices, systems, instruments, and methods thereof. The expandable fusion implant may include an upper endplate assembly and a lower endplate assembly. The upper and lower endplate assemblies may be configured to expand in width. A rotatable actuator may move one or more driving ramps, which mate with an upper ramp and a lower ramp, respectively. The actuator may cause independent movement of one or more of the driving ramps, thereby causing an expansion in height of the upper and lower endplate assemblies.

A method and apparatus can include: a delivery tool having an insertion mandrel; an implant having a distal segment coupled to a proximal segment, the proximal segment having a proximal segment upper and a proximal segment lower, the distal segment having a distal segment upper and a distal segment lower, the implant including: a straight configuration based on the insertion mandrel being extended through the proximal segment and the distal segment, and a curved configuration based on the insertion mandrel being retracted from the distal segment; and an expansion mandrel configured for insertion into the implant, the implant including an expanded configuration based on the expansion mandrel being inserted between the proximal segment upper and the proximal segment lower, and being inserted between the distal segment upper and the distal segment lower.

An expandable fusion device is capable of being installed inside an intervertebral disc space to maintain normal disc spacing and restore spinal stability, thereby facilitating an intervertebral fusion. The fusion device may include a body portion, a first endplate, and a second endplate, the first and second endplates capable of being moved in a direction away from the body portion into an expanded configuration or capable of being moved towards the body portion into an unexpanded configuration. The fusion device is capable of being deployed and installed in both configurations.

An augment device for a joint endoprosthesis, the device including a sleeve surrounding a channel extending through the sleeve. The sleeve is formed of porous material for ingrowth of bony material, the sleeve comprising an inner face and an outer face. The sleeve further comprises a wall surrounding the channel, the wall being made of solid material and forming a sandwich structure with the porous material, wherein the wall forms a bulkhead between the inner face and the outer face. Thereby, the bulkhead wall will stop inflow of any cement across the sleeve from its inner to its outer face. The porous material on the outer face will be kept free from cement and its capability to promote bone ingrowth is reliably preserved. The augment devices are preferably provided as a set having different sizes and straight or stepped bottoms for improved versatility and maximum preservation of natural bone matter.

Interbody spacers are expandable horizontally and vertically by an application of axial force, and lockable in an expanded configuration. The spacers include support members interconnected to end bodies by pivotable link members. The spacers are introduced between vertebral bodies in a compressed configuration and expanded to fill the intervertebral space and provide support and selective lordotic correction. Graft material may be introduced into the expanded spacer. Provisional and/or supplementary locking means lock the spacers in the expanded configuration. Embodiments of the spacers include symmetrically and asymmetrically configured spacers. Methods of expansion include symmetric expansion or asymmetric expansion along each of two directions.

An expandable implant (100, 150, 160, 200, 250, 300, 400) has a base (10) and a displaceable element (12) hingedly interconnected at one end. At the other end, the base and the displaceable element are formed with complementary jaws (24, 26) which provide continuous overlap of facing surfaces over a range of angular positions of the displaceable element relative to said base. In some cases, the first end portion (16) of the displaceable element (12) is formed with projecting teeth (28) forming a partial gear centered on an axis (18) of the hinged interconnection with the base (12) for engaging a worm gear. In certain embodiments, the base is formed with a socket (30) for removably receiving a worm gear tool (32) for engaging the teeth (28) and displacing said displaceable element. After expansion, the worm-gear tool (32) can be removed.

Described herein are intervertebral fusion devices and their methods of use. Also described herein are interbody device systems and the methods of using the same.