Patent ID: 8202301

Claim:
A dynamic spinal rod comprising: a shank with a first end configured to be coupled with a first pedicle screw, an opposite second end, and an intermediate section between the first end and the second end; a stay configured to be coupled with a second pedicle screw, the stay being slideably coupled along the shank; a casing composed of multiple layers of material that are bonded together, the casing coupled with the intermediate section of the shank and coupled to the stay, the casing being sized to stretch tightly between a portion of the shank and the stay and provide a structural connection between the shank and the stay when the stay is near the second end of the shank, and sized to extend loosely between a portion of the shank and the stay when the stay is moved closer to the first end of the shank; and a bumper comprising a material injected into the dynamic spinal rod between the shank and the stay to dampen contracting movement of the dynamic spinal rod.