Bone fusion device, apparatus and method
A bone fusion method, apparatus and device for insertion between bones that are to be fused together and/or in place of one or more of the bones, such as, for example, the vertebrae of a spinal column. The bone fusion device comprises one or more extendable plates having a central rib. The bone fusion device includes one or more support channels configured to receive an insertion instrument that is then secured to the bone fusion device via a coupling mechanism. As a result, the coupled device is able to be securely positioned between vertebrae using the insertion instrument with minimal risk of slippage.
1. A bone fusion device comprising:
one or more extendable tabs;
a fusion body having a top, a bottom opposite the top, a first side, a second side opposite the first side, a front end, a back end opposite the back end, an interior cavity, a first surface channel positioned on the first side of the fusion body above a horizontal midline of the fusion body between the one or more extendable tabs and a second surface channel positioned on the second side of the fusion body below the horizontal midline of the fusion body, wherein the extendable tabs extend from the top and the bottom of the fusion body; and
a positioning element positioned through the front end of the fusion body and substantially within the interior cavity of the body, wherein the positioning element is configured to selectively move the one or more extendable tabs between a retracted position and an extended position.
2. The bone fusion device of claim 1 , wherein the first surface channel and the second surface channel are accessible from the front end and extend through a plane perpendicular to the front end.
3. The bone fusion device of claim 2 , wherein each of the first surface channel and the second surface channel comprise a gripping aperture positioned within the first surface channel and the second surface channel for receiving a fingertip of fingers of an insertion instrument.
4. The bone fusion device of claim 3 , further comprising one or more sliding blocks operably coupled with the positioning element and the extendable tabs.
5. The bone fusion device of claim 4 , wherein rotation of the positioning element causes the sliding blocks to slide along the positioning element thereby pushing the one or more extendable tabs out of the fusion body or enabling the one or more extendable tabs to slide back into the body.
6. The bone fusion device of claim 5 , wherein the positioning element comprises a first threaded portion threaded in a first direction and a second threaded portion threaded in a second direction, opposite from the first direction.
7. A bone fusion device comprising:
a fusion body having an interior cavity;
one or more extendable tabs; and
a positioning element positioned through an aperture of a front end of the fusion body and substantially within the interior cavity of the fusion body, wherein the positioning element is operably coupled with the one or more extendable tabs such that rotation of the positioning element causes the one or more extendable tabs to move between a retracted position and an extended position; and
a locking mechanism positioned around a head of the positioning element, wherein when the locking mechanism is moved from a free position to a locked position, the locking mechanism pushes against the head of the positioning element thereby inhibiting rotation of the positioning element, wherein the locking mechanism comprises a choke and a tapered collar having a narrow end and a broad end positioned around the head of the positioning element.
8. The bone fusion device of claim 7 , wherein an inner surface of the choke is smaller than the broad end of the tapered collar such that sliding the choke onto the collar from the narrow end to the broad end squeezes the tapered collar causing the tapered collar to squeeze the head of the positioning element.
9. The bone fusion device of claim 8 , wherein the choke comprises a plurality of exterior ridges and an inner surface of the aperture of the front end of the fusion body has interior ridges that interlock with the exterior ridges as the choke slides onto the tapered collar from the narrow end to the broad end.
10. The bone fusion device of claim 9 , wherein the tapered collar has a gap such that the tapered collar does not form a complete tube.
11. The bone fusion device of claim 7 , wherein the head of the positioning element comprises a plurality of gear teeth and the locking mechanism comprises a pawl operatively coupled with the plurality of gear teeth.
12. A bone fusion device comprising:
a fusion body having an interior cavity;
one or more extendable tabs; and
a positioning element positioned through an aperture of a front end of the fusion body and substantially within the interior cavity of the fusion body, wherein the positioning element is operably coupled with the one or more extendable tabs such that rotation of the positioning element causes the one or more extendable tabs to move between a retracted position and an extended position; and
a locking mechanism positioned around a head of the positioning element, wherein when the locking mechanism is moved from a free position to a locked position, the locking mechanism pushes against the head of the positioning element thereby inhibiting rotation of the positioning element, wherein the locking mechanism comprises a locking member having a hole positioned around the head of the positioning element, wherein the hole is offset from a center of the locking member.
13. The bone fusion device of claim 12 , wherein a perimeter of the locking member comprises a plurality of bumps and an inner surface of the aperture of the front end of the fusion body has a plurality of notches for receiving one or more of the plurality of bumps.
14. The bone fusion device of claim 13 , wherein the positioning element is offset from a middle of the aperture of the front end of the fusion body.
15. A bone fusion device comprising:
a fusion body having an interior cavity;
one or more extendable tabs; and
a positioning element positioned through an aperture of a front end of the fusion body and substantially within the interior cavity of the fusion body, wherein the positioning element is operably coupled with the one or more extendable tabs such that rotation of the positioning element causes the one or more extendable tabs to move between a retracted position and an extended position; and
a locking mechanism positioned around a head of the positioning element, wherein when the locking mechanism is moved from a free position to a locked position, the locking mechanism pushes against the head of the positioning element thereby inhibiting rotation of the positioning element, wherein the locking mechanism comprises an oblong locking member having an elongated dimension, a shorter dimension perpendicular to the elongated dimension, and a hole positioned around the head of the positioning element, wherein the oblong locking member is rotatably coupled to the head of the positioning element such that the oblong locking member is able to rotate around the head of the positioning element and within the aperture of the front end.
16. The bone fusion device of claim 15 , wherein the aperture of the front end of the fusion body is oblong such that the aperture has a longer dimension and a short dimension.
17. The bone fusion device of claim 16 , wherein an inner surface of the aperture of the front end of the fusion body has a plurality of notches for receiving one or more edges of the oblong locking member extending in the elongated dimension when the elongated dimension aligns with one or more of the plurality of notches.