Multi-level vertebral implant system
A spinal implant system ( 10 ) includes a superior attachment rod ( 12 ) coupled to, and articulating with respect to, a roller housing ( 17 ), an inferior cross bar member ( 20 ) coupled to the roller housing ( 17 ), and an inferior attachment rod ( 14 ) coupled to the inferior cross bar member ( 20 ). At least one of the superior and inferior attachment rods ( 12, 14 ) is supported by a flexure assembly ( 16 ). The inferior attachment rod ( 14 ) is coupled to the inferior cross bar member ( 20 ) with a swivel joint ( 32 ) and/or a telescoping portion ( 20 ).
1. A spinal implant system comprising:
a superior attachment rod coupled to, and articulating with respect to, a roller housing, wherein said superior attachment rod passes through a hole formed in said roller housing, said hole being larger than an outer diameter of said superior attachment rod such that said superior attachment rod can tilt and radially translate with respect to said hole;
an inferior cross bar member coupled to said roller housing;
an inferior attachment rod coupled to said inferior cross bar member, wherein a flexure assembly is mounted on said superior attachment rod and said hole is larger than an outer diameter of said flexure assembly such that there is a gap between the inner diameter of said hole and the outer diameter of said flexure assembly so that said superior attachment rod and said flexure assembly are not clamped in said hole but instead tilt and radially translate with respect to said hole; and
wherein said inferior attachment rod comprises at least two inferior attachment rods which are coupled to said inferior cross bar member with a common swivel joint and a telescoping portion, wherein side-to-side movement of said telescoping portion determines a side-to-side position of said inferior attachment rods, and wherein said inferior attachment rods are rotatable about a longitudinal axis of said telescoping portion.
2. The spinal implant system according to claim 1 , wherein said flexure assembly comprises an elastomeric cushion.
3. The spinal implant system according to claim 1 , wherein said inferior attachment rods are movable independently of each other.
4. The spinal implant system according to claim 1 , wherein said inferior attachment rods are movable together symmetrically with respect to each other.
5. The spinal implant system according to claim 1 , wherein said telescoping portion slides in said inferior cross bar member.
6. The spinal implant system according to claim 1 , wherein said swivel joint comprises a ball-and-socket joint.
7. The spinal implant system according to claim 1 , wherein said superior attachment rod is free to translate, tilt or rotate in any direction, including rotating about a longitudinal axis of said superior attachment rod.
8. The spinal implant system according to claim 1 , wherein said inferior attachment rods articulate with respect to the implant system in multiple axes of rotation.
9. The spinal implant system according to claim 1 , wherein a fastener is used to fix the side-to-side position of said inferior attachment rods and a rotational orientation of said inferior attachment rods about the longitudinal axis of said telescoping portion.