Spinal implant with expandable fixation
First Claim
1. A spinal implant for placement in a space between opposed first and second vertebral bodies, the implant comprising:
- a first end plate having a first surface for engaging a first vertebral body;
at least two separate second end plates having respective second surfaces for engaging a second vertebral body, such that the at least two separate second end plates are independently movable with respect to the first end plate, with each of the at least two separate second end plates being adapted to independently change angles with respect to the first end plate; and
at least two extendable fixation elements, each having a distal tip, a contracted configuration within the implant to facilitate deployment of the implant between the first and second vertebral bodies, and an extended configuration to extend each distal tip beyond one of the at least two second surfaces to engage the second vertebral body and to fix the implant within the space between the first and second vertebral bodies;
wherein each of the at least two separate second end plates are adapted to independently change angles with respect to the first end plate about a respective pivot point that is fixed with respect to the respective second end plate, such that each of the second end plates are constrained to pivot about the respective pivot point.
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Accused Products
Abstract
A spinal implant which is configured to be deployed between adjacent vertebral bodies. The implant has at least one fixation element with a retracted configuration to facilitate deployment of the implant and an extended configuration so as to engage a surface of an adjacent vertebral body and secure the implant between two vertebral bodies. Preferably, the implant is expandable and has a minimal dimension in its unexpanded state that is smaller than the dimensions of the neuroforamen through which it must pass to be deployed within the intervertebral space. Once within the space between vertebral bodies, the implant can be expanded so as to engage the endplates of the adjacent vertebrae to effectively distract the anterior disc space, stabilize the motion segments and eliminate pathologic spine motion. Angular deformities can be corrected, and natural curvatures restored and maintained.
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Citations
22 Claims
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1. A spinal implant for placement in a space between opposed first and second vertebral bodies, the implant comprising:
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a first end plate having a first surface for engaging a first vertebral body; at least two separate second end plates having respective second surfaces for engaging a second vertebral body, such that the at least two separate second end plates are independently movable with respect to the first end plate, with each of the at least two separate second end plates being adapted to independently change angles with respect to the first end plate; and at least two extendable fixation elements, each having a distal tip, a contracted configuration within the implant to facilitate deployment of the implant between the first and second vertebral bodies, and an extended configuration to extend each distal tip beyond one of the at least two second surfaces to engage the second vertebral body and to fix the implant within the space between the first and second vertebral bodies; wherein each of the at least two separate second end plates are adapted to independently change angles with respect to the first end plate about a respective pivot point that is fixed with respect to the respective second end plate, such that each of the second end plates are constrained to pivot about the respective pivot point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A spinal implant for placement in an intervertebral space between opposed vertebral bodies, comprising:
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a base member defining first and second spaced apart cylinders; first and second extendable members disposed, respectively, in the first and second cylinders; first and second extendable fixation elements disposed, respectively, in the first and second extendable members; and two separate pressure applying plates cooperating with the respective first and second extendable members, the two separate pressure applying plates being independently movable with respect to the base member, with each of the two separate pressure applying plates being adapted to independently change angles with respect to the base member, the two separate pressure applying plates being disposed opposite the base member to define a central cavity configured to receive bone graft material between the first and second cylinders and between the base member and the pressure applying plates, the central cavity being open at a first end and a second end to the intervertebral space for communication therewith, the central cavity having an axis between the first end and the second end transverse to the direction of extension of the extendable members; wherein each of the two separate pressure applying plates are adapted to independently change angles with respect to the base member about a respective pivot point that is fixed with respect to the respective pressure applying plate, such that each of the pressure applying plates are constrained to pivot about the respective pivot point. - View Dependent Claims (13, 14, 15)
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16. A spinal implant for placement in a space between opposed first and second vertebral bodies, the implant comprising:
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a first end plate having a first surface for engaging a first vertebral body; a second end plate having a second surface for engaging a second vertebral body; a third end plate having a third surface for engaging the second vertebral body; a first extendable support member coupled to the first end plate and the second end plate, the first extendable support member being extendable so as to move the second end plate away from the first end plate; and a second extendable support member coupled to the first end plate and the third end plate, the second extendable support member being extendable so as to move the third end plate away from the first end plate; wherein the first and second extendable support members are individually extendable so as to individually move the respective second and third end plates with respect to the first end plate; wherein the first and second extendable support members are pivotably coupled to the respective second and third end plates such that the second and third end plates can independently change angles with respect to the first end plate; and wherein the first extendable support member is pivotably coupled to the second end plate at a first pivot point that is fixed with respect to the second end plate, such that the second end plate is constrained to pivot about the first pivot point, and wherein the second extendable support member is pivotably coupled to the third end plate at a second pivot point that is fixed with respect to the third end plate, such that the third end plate is constrained to pivot about the second pivot point. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification