An intervertebral implant for positioning within an intervertebral space between adjacent first and second vertebral bodies. The intervertebral implant includes an implant body extending along a longitudinal axis of the intervertebral implant that is adapted to align with a vertical axis of the spine. The implant body includes a top plate and a bottom plate disposed longitudinally opposite and spaced apart from the top plate along the longitudinal axis. Further, the implant body includes at least one cross-arm obliquely extending between the top plate and the bottom plate. Furthermore, the implant body includes a lattice structure disposed at least between the at least one cross-arm and the top plate and between the at least one cross-arm and the bottom plate.

The present invention provides an expandable fusion device 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 described herein is capable of being installed inside an intervertebral disc space at a minimum to no distraction height and for a fusion device capable of maintaining a normal distance between adjacent vertebral bodies when implanted.

An intervertebral implant comprising a body formed as an open truss structure, the body having a generally annular shape with a superior surface, an inferior surface, and a perimeter surface extending around an outer periphery of the body. The body may have a central portion and a peripheral portion, the peripheral portion extending inward from the perimeter surface toward the central portion, the peripheral portion including a first set of trusses, and the central portion including a second set of trusses. The implant may further include a strut at least partially defining a boundary between the central portion and the peripheral portion, wherein the strut has an oblong cross-sectional shape oriented to facilitate flow of bone graft material in a substantially radial direction away from the central axis.

According to some embodiments of the invention, an intervertebral disc replacement includes a first layer having a lower surface for contacting a first vertebral bone, a second layer coupled to the first layer, the second layer comprising a plurality of compressible column springs, and a third layer coupled to the second layer, the third layer having an upper surface for contacting a second vertebral bone. Each of the plurality of compressible column springs comprises a plurality of stacked coils, and each of the plurality of stacked coils has a spring constant (K). At least one of the plurality of compressible column springs includes a first coil having a first spring constant and a second coil comprising a second spring constant, wherein the first spring constant is different from the second spring constant.

A spinal fusion implant including a body and a jacket is disclosed. The jacket includes at least two radiopaque markers extending therefrom for use in determining the position of the implant after placement between intervertebral bodies. Methods of implanting and evaluating positioning of the implant are also disclosed.

An expandable corpectomy implant and methods of making and using same. The expandable spinal implant includes an inner member and an outer member. The inner member and outer member each have a first end, a second end and a sidewall. The inner member is positioned in the outer member and the inner member and the outer member have a selected cross sectional shape. The inner member is configured such that it slidably protrudes from the outer member. The inner member has at least one tab incorporated into the sidewall of the inner member and the outer member has at least one aperture formed in the sidewall of the outer member such that the at least one tab of the inner member engages the corresponding at least one aperture of the outer member so that the inner member is locked with the outer member.

A threaded implant can be provided with an elongated main body having external threads configured to thread into bone, and an internal support structure located within the external threads. The internal support structure has a helical arrangement that extends in an opposite direction to the external threads. Other threaded implants and methods are also disclosed.

A femoral stem prosthesis features a proximal section and a distal section, both of which have a medial edge and a lateral edge. The proximal section is generally wider in a medio-lateral direction than the distal section. The proximal section and the distal section both taper inwardly in a medio-lateral direction such that an anterior-posterior thickness of the medial edge is greater than an anterior-posterior thickness of the lateral edge.

The present invention relates generally to medical devices, systems, and methods for use in surgery. In particular, the disclosed system and methods relate to an intervertebral spinal implant sized and dimensioned for the lumbar spine implantable via a posterior approach. The system includes an implant, instruments for delivering the implant.

According to some embodiments of the invention, an intervertebral disc replacement includes a first layer having a lower surface for contacting a first vertebral bone, a second layer coupled to the first layer, the second layer comprising a plurality of compressible column springs, and a third layer coupled to the second layer, the third layer having an upper surface for contacting a second vertebral bone. Each of the plurality of compressible column springs comprises a plurality of stacked coils, and each of the plurality of stacked coils has a spring constant (K). At least one of the plurality of compressible column springs includes a first coil having a first spring constant and a second coil comprising a second spring constant, wherein the first spring constant is different from the second spring constant.