Adjustable Distraction Cage With Linked Locking Mechanisms
First Claim
1. A spinal implant for placement between first and second vertebral bodies, comprising:
- a first member having a surface for engaging a first vertebral body;
a second member cooperating with the first member and having a surface for engaging a second vertebral body;
at least one extendable support element having a contracted configuration to facilitate deployment of the implant between the superior and inferior vertebral bodies and at least one extended configuration to extend the first member away from the second member so that the surface thereof engages the first vertebral body; and
a locking system which has a locking element that mechanically engages or interlocks with the extendable support element of the first member to lock the implant between the first and second vertebral bodies in an expanded configuration.
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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 extendable support element with a refracted configuration to facilitate deployment of the implant and an extended configuration so as to expand the implant and effectively distract the disc space, stabilize the motion segments and eliminate pathologic spine motion. The implant has a minimal dimension in its unexpanded state that is smaller than the dimensions of the neuroforamen through which it typically passes to be deployed within the intervertebral space. The implant is provided with a locking system having a plurality of linked locking elements that work in unison to lock the implant in an extended configuration. Bone engaging anchors also may be provided to ensure secure positioning
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Citations
44 Claims
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1. A spinal implant for placement between first and second vertebral bodies, comprising:
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a first member having a surface for engaging a first vertebral body; a second member cooperating with the first member and having a surface for engaging a second vertebral body; at least one extendable support element having a contracted configuration to facilitate deployment of the implant between the superior and inferior vertebral bodies and at least one extended configuration to extend the first member away from the second member so that the surface thereof engages the first vertebral body; and a locking system which has a locking element that mechanically engages or interlocks with the extendable support element of the first member to lock the implant between the first and second vertebral bodies in an expanded configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A spinal implant for placement between adjacent vertebral bodies, comprising:
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a top end plate for engaging a first adjacent vertebral body; a bottom end plate for engaging a second adjacent vertebral body; at least two extendable piston members having 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 the top end plate into engagement with the first adjacent vertebral body; an upper lock support member associated with each extendable piston member having a multi-stepped support surface; a lower lock support member corresponding to each upper lock support member having a multi-stepped support surface configured to engage the multi-stepped support surface of the upper lock support member; a locking actuator which causes relative motion between the upper and lower lock support members when the at least one extendable member is extended so as to lock the implant in an expanded configuration by engaging the multi-stepped support surfaces of the upper lock support members and the lower lock support members; and a linking member extending between the lower lock support members to link said lower lock members for locking in unison. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A lockable, extendable spinal implant for placement between first and second vertebral bodies, comprising:
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first and second bone engaging members each having a surface configured to respectively engage opposed first and second vertebral bodies; extension means acting between the first and second bone engaging members to control extension of said bone engaging members between contracted and extended configurations; first and second fixed lock members fixed to one of said first and second bone engaging members and extending towards the opposite bone engaging member, the fixed lock members being spaced apart and each having a fixed locking surface; first and second moveable lock members captured between the first and second bone engaging members for cooperation with the fixed lock members, each moveable lock member having a moveable locking surface configured to engage an opposed fixed locking surface on one said fixed lock member to prevent contraction of said extension means; a locking actuator configured to engage the moveable locking surfaces with the fixed locking surfaces; and a link member operatively connected between the first and second moveable lock members to coordinate movement therebetween. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A lockable, extendable spinal implant for placement between first and second vertebral bodies, comprising:
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first and second bone engaging members each having a surface configured to respectively engage opposed first and second vertebral bodies; first and second pistons disposed on one said bone engaging member and cooperating with mating cylinders disposed on the opposite bone engaging member, said pistons moveable between a contracted configuration within said cylinders and an extended configuration extending from said cylinders; first and second arcuate, fixed lock members, each having a fixed locking surface, mounted to one of said bone engaging members, each disposed around one said piston, the fixed lock members extending towards the opposite bone engaging member; first and second moveable lock members, each formed around one said cylinder for cooperation with the fixed lock members, each moveable lock member having a moveable locking surface configured to engage an opposed fixed locking surface on one said fixed lock member to prevent contraction of said extension means; at least one biasing element acting on at least one said moveable lock member to bias said member into engagement with its associated fixed lock member; and a link member operatively connected between the first and second moveable lock members to coordinate movement therebetween and force the other moveable lock member into engagement with its associated fixed lock. - View Dependent Claims (38, 39, 40)
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41. A lockable, extendable spinal implant for placement between first and second vertebral bodies, comprising:
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first and second bone engaging members each having a surface configured to respectively engage opposed first and second vertebral bodies; first and second pistons disposed on one said bone engaging member and cooperating with mating cylinders disposed on the opposite bone engaging member, said pistons moveable between a contracted configuration within said cylinders and an extended configuration extending from said cylinders; first and second arcuate, fixed lock members, each having a fixed locking surface, mounted to one of said bone engaging members, each disposed inside one said piston, the fixed lock members extending towards the opposite bone engaging member; first and second moveable lock members, each formed inside one said cylinder for cooperation with the fixed lock members, each moveable lock member having a moveable locking surface configured to engage an opposed fixed locking surface on one said fixed lock member to prevent contraction of said extension means; at least one biasing element acting on at least one said moveable lock member to bias said member into engagement with its associated fixed lock member; and a link member operatively connected between the first and second moveable lock members to coordinate movement therebetween and force the other moveable lock member into engagement with its associated fixed lock. - View Dependent Claims (42, 43, 44)
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Specification