Expandable inter-body device, expandable plate system, and associated methods
The present disclosure provides for spinal implants and plates including, for example, expandable plates deployable between a contracted position and an expanded position. The expandable plate may include an expandable body including a first portion and a second portion. The first portion may include a receiving cavity facing the proximal end, and a first through aperture extending in the proximal-to-distal direction. The second portion may include a lower end having a size and shape that corresponds to the receiving cavity, and a second through aperture extending in the proximal-to-distal direction. The expandable plate may include a locking screw and a nut. In at least some embodiments, in a locked position, the locking screw extends through the first through aperture and second through aperture, and is secured to the nut. In various embodiments, in an expanded position the first portion and second portion are farther away from one another relative to a contracted position.
1. An expandable plate deployable between a contracted position and an expanded position, comprising:
an expandable body having a thickness in a proximal-to-distal direction between a proximal end and a distal end, a width in a widthwise direction, and a height in a longitudinal direction, the expandable body comprising a first portion and a second portion;
wherein the first portion includes:
a receiving cavity facing the proximal end, and
a first through aperture extending in the proximal-to-distal direction,
wherein the second portion includes:
a lower end having a size and shape that corresponds to the receiving cavity, and
a second through aperture extending in the proximal-to-distal direction,
a locking screw; and
a nut,
wherein, in a locked position, the locking screw extends through the first through aperture and the second through aperture, and is secured to the nut, and
wherein the expandable plate is configured to couple to a proximal face of an intervertebral spinal implant via the locking screw.
2. The expandable plate of claim 1 , wherein:
the receiving cavity comprises a first rack portion comprising a plurality of raised rails and indented grooves; and
a distal end of the second portion comprises a second rack portion comprising a plurality of raised rails and indented grooves.
3. The expandable plate of claim 2 , wherein, in the locked position, the first rack portion and second rack portion are directly engaged.
4. The expandable plate of claim 1 , wherein the first portion comprises a first bone screw aperture and the second portion comprises a second bone screw aperture.
5. The expandable plate of claim 4 , wherein the locking screw comprises a tapered portion.
6. The expandable plate of claim 1 , wherein a distal end of the second portion comprises a slotted aperture.
7. The expandable plate of claim 6 , wherein the nut is disposed within the slotted aperture.
8. The expandable plate of claim 7 , wherein the nut comprises a first planar side surface and a second planar side surface opposite the first planar side surface.
9. The expandable plate of claim 8 , wherein:
a first distance of the slotted aperture extends in the widthwise direction;
a second distance of the nut extends between the first planar side surface and the second planar side surface; and
the first distance approximates the second distance.
10. The expandable plate of claim 1 , wherein:
the receiving cavity comprises a first rack portion comprising a plurality of raised rails and indented grooves; and
the first through aperture extends through the first rack portion.
11. The expandable plate of claim 10 , wherein:
a distal end of the second portion comprises a second rack portion comprising a plurality of raised rails and indented grooves; and
the second through aperture extends through the second rack portion.
12. The expandable plate of claim 1 , comprising:
a rotatable end cap, and
wherein the first portion comprises a first bone screw aperture configured to orient a first bone screw in a target trajectory and the second portion comprises a second bone screw aperture configured to orient a second bone screw in a target trajectory.
13. The expandable plate of claim 12 , wherein, in a first position, the end cap is positioned such that the first bone screw aperture and second bone screw aperture are accessible.
14. The expandable plate of claim 13 , wherein, in a second position, the end cap is positioned such that the first bone screw aperture and second bone screw aperture are blocked.
15. The expandable plate of claim 1 , wherein:
the expandable body comprises a longitudinal axis crossing over a center of the expandable body in the longitudinal direction, and
the expandable body is substantially symmetrical with respect to the longitudinal axis.
16. The expandable plate of claim 1 , wherein:
the intervertebral spinal implant comprises an expansion mechanism including at least one set screw configured to expand the intervertebral spinal implant, and
the locking screw includes a central aperture extending therethrough and being configured to allow a drive tool to extend through the central aperture for rotating the at least one set screw.
17. A method for installing an expandable plate and an expandable spinal implant, comprising:
providing an expandable spinal implant;
providing an expandable plate, the expandable plate including:
an expandable body having a thickness in a proximal-to-distal direction between a proximal end and a distal end, a width in a widthwise direction, and a height in a longitudinal direction, the expandable body comprising a first portion and a second portion;
wherein the first portion includes:
a receiving cavity facing the proximal end,
a first bone screw aperture, and
a first through aperture extending in the proximal-to-distal direction,
wherein the second portion includes:
a lower end having a size and shape that corresponds to the receiving cavity,
a second bone screw aperture, and
a second through aperture extending in the proximal-to-distal direction,
a locking screw; and
a nut,
wherein, in a locked position, the locking screw extends through the first through aperture and second through aperture, and is secured to the nut, and
wherein the expandable plate is configured to couple to a face of the expandable spinal implant via the locking screw;
inserting the expandable spinal implant between adjacent boney structures;
installing a first bone screw that extends through either one of the first bone screw aperture and second bone screw aperture; and
coupling the expandable plate to the face of the expandable spinal implant via the locking screw.
18. The method of claim 17 , further comprising:
expanding the expandable plate; and
expanding the expandable spinal implant.
19. The method of claim 17 , further comprising positioning a lip portion of the expandable plate against an apophyseal ring of a patient.
20. The method of claim 17 , further comprising removing a degenerative portion of a patient anatomy.