Expandable intervertebral implants and methods of installation thereof
Embodiments herein are generally directed to expandable spinal implants, systems, apparatuses, and components thereof that can be used in spinal fusion and/or stabilization procedures, as well as methods of installation. The expandable spinal implants may be configured for lateral insertion.
1. An expandable spinal implant comprising:
a stationary base member comprising a bore, a first elongate slot having a longitudinal axis parallel to a longitudinal axis of the stationary base member, and a second elongate slot having a longitudinal axis that is oblique to the longitudinal axis of the stationary base member;
a moveable base member comprising a threaded portion, a first protrusion configured and dimensioned to be received in the first elongate slot, and a second protrusion configured and dimensioned to be received in the second elongate slot; and
an actuator received within the bore and comprising a threaded portion for threadingly engaging the threaded portion of the moveable base member,
wherein rotation of the actuator in a first direction causes the movable base member to move away from the stationary base member from a first position to a second position and rotation of the actuator in a second direction causes the movable base member to move in a direction towards the stationary base member from the second position to the first position.
2. The expandable spinal implant of claim 1 , wherein the movable base member is comprised of first and second arms, the first and second arms capable of moving with respect to each other.
3. The expandable spinal implant of claim 2 , wherein the first arm is pivotably connected to the second arm.
4. The expandable implant of claim 1 , wherein the movable base member includes an upper surface, a first end, a second end, a first side and a second side, wherein the first side is generally concave and the second side is generally convex when the movable base member is in the second position.
5. The expandable implant of claim 1 , wherein a generally central cavity is created between the stationary base member and the movable base member when the movable base member is in the second position.
6. The expandable implant of claim 1 , further comprising at least one pin received in the stationary base member and engaging the actuator allowing the actuator to rotate but not translate linearly.
7. The expandable implant of claim 1 , wherein the bore extends substantially an entire length of the stationary base member.
8. An expandable spinal implant comprising:
a stationary base member having an anterior end and a posterior end, an upper side, and a lower side, the stationary base member comprising a bore and first and second elongate slots, the elongate slots comprising axes that are generally parallel to a longitudinal axis of the stationary base member;
a movable base member comprising a first arm and a second arm, the first arm having an anterior end and a posterior end and the second arm having an anterior end and a posterior end, wherein the anterior end of the second arm is pivotably attached to the posterior end of the first arm, wherein the anterior end of the first arm includes threading and a first protrusion, the first protrusion configured and dimensioned to engage the first elongate slot, wherein the posterior end of the second arm includes a second protrusion, the second protrusion configured and dimensioned to engage the second elongate slot; and
an actuator received within the bore and comprising a threaded portion for threadingly engaging the threaded portion of the movable base member,
wherein rotation of the actuator in a first direction causes the moveable base member to move away from the stationary base member from a first position to a second position and rotation of the actuator in a second direction causes the moveable base member to move in a direction towards the stationary base member from the second position to the first position.
9. The expandable spinal implant of claim 8 , wherein the stationary base member includes a third elongate slot having a longitudinal axis that is oblique to the longitudinal axis of the stationary base member.
10. The expandable implant of claim 9 , wherein the posterior end of the second arm has a third protrusion configured and dimensioned to be received in the third elongate slot.
11. The expandable implant of claim 8 , wherein the first and second arms each include an upper surface, a lower surface, a first side and a second side, wherein the first sides of the first arm and the second arm are generally concave and the second sides of the first arm and the second arm are generally convex when the movable base member is in the second position.
12. The expandable implant of claim 11 , wherein a generally central cavity is created between the stationary base member and the movable base member when the movable base member is in the second position.
13. The expandable implant of claim 8 , further comprising at least one pin received in the stationary base member and engaging the actuator allowing the actuator to rotate but not translate linearly.
14. The expandable implant of claim 8 , wherein the bore extends substantially an entire length of the stationary base member.
15. The expandable implant of claim 8 , wherein the actuator includes a tool engaging receptacle.
16. The expandable implant of claim 8 , wherein in the first position, the stationary base member and the moveable base member have a generally rectangular profile.
17. The expandable implant of claim 8 , wherein a width of the stationary base member and the moveable base member is greater in the second position than in the first position.
18. The expandable implant of claim 8 , wherein the movable base member moves laterally away from the stationary base member when the moveable base member moves from the first position to the second position.