Standalone interbody implants
Stand-alone interbody fusion devices for engagement between adjacent vertebrae. The stand-alone interbody fusion devices may include a spacer and one or more inserts or members coupled to the spacer. The inserts or members may be configured and designed to provide the apertures which are designed to retain bone fasteners, such as screws, and secure the implant to the adjacent vertebrae.
1. An intervertebral implant for implantation in an intervertebral space between adjacent vertebrae, the implant comprising:
a spacer having a superior surface, an inferior surface, a proximal end, and a distal end, wherein the superior surface and the inferior surface each have a contact area configured to engage adjacent vertebrae, the spacer defining an opening extending from the superior surface to the inferior surface of the spacer, wherein the spacer is formed of a first spacer portion, a second spacer portion, and a connector connecting the first spacer portion to the second spacer portion, wherein the connector comprises a first tenon received in a first mortise of the first spacer portion and a second tenon received in a second mortise of the second spacer portion; and
an insert at least partially defining a fastener aperture sized and dimensioned for receiving a fastener, wherein a first end of the insert is coupled to the first spacer portion and a second end of the insert is coupled to the second spacer portion by one of a recess or a projection.
2. The implant of claim 1 , wherein at least a portion of the insert extends a distance beyond the superior surface, the inferior surface, or both the superior and inferior surfaces of the spacer.
3. The implant of claim 1 , wherein the spacer is formed of a first material and the insert is formed of a second material different from the first material.
4. The implant of claim 1 , wherein the insert comprises a head portion and an arm projecting therefrom, wherein the head portion defines the fastener aperture.
5. The implant of claim 4 , wherein the spacer defines at least one recess sized and dimensioned to retain at least a portion of the arm.
6. The implant of claim 4 , wherein the arm rests against a portion of the spacer to form a half lap joint, and the half lap joint is secured with a pin.
7. The implant of claim 1 , wherein the insert comprises a front surface and a pair of eyebrows.
8. A stand-alone implant for implantation in a treated area of an intervertebral space between vertebral bodies of a spine, the implant comprising:
a spacer having a first spacer portion and a second spacer portion, each of the first and second spacer portions having a first end and a second end, wherein the second end of the first spacer portion is coupled to the first end of the second spacer portion, the first and second spacer portions forming a superior surface and an inferior surface, wherein the superior surface and the inferior surface each have a contact area configured to engage adjacent vertebrae, wherein the first and second spacer portions are secured together with a connector, wherein the connector includes first and second tenons sized and configured to be received within a first mortise in the second end of the first spacer portion and a second mortise in the first end of the second spacer portion, respectively; and
a member having an upper surface, a lower surface, a first lateral portion, a second lateral portion, and at least one hole traversing the member for receiving a fastener;
wherein the member is coupled to the spacer such that the first end of the first spacer portion engages the first lateral portion of the member and the second end of the second spacer portion engages the second lateral portion of the member.
9. The implant of claim 8 , wherein the first and second spacer portions are mated together by a splice joint.
10. The implant of claim 8 , wherein the member comprises a first extension extending from the first lateral portion and a second extension extending from the second lateral portion, wherein the first extension contacts a first ledge on the first spacer portion to form a first half lap joint, the second extension contacts a second ledge on the second spacer portion to form a second half lap joint, and the first and second half lap joints are each secured with a pin.