The invention discloses a screw-rod instrument specially used for posterior atlantoaxial vertebrae fixation, comprising two pulling-screws (2), two supporting-screws (1), two variable cross section fixing rods (3), two lock nuts (4) and a bracing beam (5). Each of the variable cross section fixing rods (3) is configured to connect a supporting-screw (1) and a pulling-screw (2), the bracing beam (5) is configured to connect both of the variable cross section fixing rods (3); wherein each of the supporting-screws (1) comprises a first tail (11) and a first head (12), and each of the pulling-screws (2) comprises a second tail (21) and a second head (22); both the first tail (11) and the second tail (21) are provided with nail grooves, with U-shaped grooves on the sides; wherein each of the nail grooves is provided with internal thread inside, and the lock nut (4) is connected with the nail groove; each of the variable cross section fixing rods (3) passes through the U-shaped grooves and is fastened by the lock nut (4); the bottoms of the nail grooves of the supporting-screws (1) are 2-6 mm higher than the bottoms of the nail grooves of the pulling-screws (2). The aforementioned screw-rod instrument not only increases the safety and convenience of a surgery, but also improves the function of spondylolisthesis reduction of the screw-rod system through raising the bottoms of the nail grooves 2-6 mm higher.

The present invention generally relates to methods and device for treatment of spinal deformity, wherein at least one tether is utilized to maintain the distance between the spine and the an ilium to (1) prevent increase in abnormal spinal curvature, (2) slow progression of abnormal curvature, and/or (3) impose at least one corrective displacement and/or rotation.

A spinal construct includes an existing spinal rod implant defining a rod dimension and having at least one mating surface. At least one extension includes a mating surface engageable with the at least one mating surface of the existing spinal rod implant to comprise a connection having a dimension the same as the rod dimension. A coupling member is configured to fix the existing spinal rod implant with the at least one extension. Systems, surgical instruments, implants and methods are disclosed.

A flexible stabilization assembly includes a flexible inner core, an outer spacer with an off-axis lumen that receives the inner core, and at least one end cap located on either end of the spacer and rotationally fixed with respect to the spacer. Bone screws cooperating with the end cap and spacer include structure for close cooperation and engagement with the end cap. When implanted, the flexible inner core is posteriorly biased with respect to the spacer.

Methods of correcting a spinal deformity, including securing a first rod on a first side of a spine, securing an anchor on a second side of a spine, securing a lateral coupling between the rod and the anchor, translating and derotating the spine to correct the spinal deformity by adjusting an effective length of the lateral coupling, and securing a second rod on a second side of the spine to provide secondary stabilization to the spine.

Devices and methods for enhancing the effectiveness of spinal stabilization, and particularly that of cervical spinal stabilization, are provided herein. More specifically, methods and systems are disclosed for effectively positioning occipital plates and spinal fixation assemblies within target vertebrae, while also reducing any associated patient trauma (e.g., muscle stripping, tissue damage, etc.). The systems and methods can utilize trans-lamina delivery of the spinal fixation assemblies to allow for the positioning of the fixation elements along the midline of the patient's spine.

For a differentiated treatment of individual motion segments of the spine, a plastic rod (41, 42, 46) for the dynamic stabilization of the spine has different degrees of stiffness in its longitudinal direction. The different rod segments are interconnected along an oblique plane (13).

A segmented rod assembly for aligning a spine including a plurality of vertebrae, including a rod, including a plurality of segments, the plurality of segments having at least a first segment arranged to be connected to a first vertebra of the spine, the first segment including a first body and at least one tang extending from the first body, and a second segment arranged to be connected to a second vertebra of the spine, the second segment including a second body and at least one channel arranged in the second body, wherein the at least tang is operatively arranged to engage the at least one channel, and at least one tensioning member arranged within the plurality of segments, the at least one tensioning member having a first end secured to the first segment and a second end.

The present invention includes an apparatus, kit and method for providing a bone fixation assembly for attachment to a bone to provide augmented support. The bone fixation assembly includes a screw having a screw head and a threaded shank. A first aperture is positioned about the screw head to receive a first longitudinal member and a first compression member that engages the first aperture to secure the first longitudinal member. The screw head has a second aperture positioned to receive a second longitudinal member and a second compression member that engages the second longitudinal member aperture to secure the second longitudinal member and provide augmented support.

A spinal fixation construct for aligning vertebral bodies includes a bone screw, a spinal rod, a flexible member, and a fixation member. The spinal rod is disposed within a saddle portion of a housing of the bone screw, and includes an elongated body having a first end and a second end. The spinal rod is formed from a first material having a first modulus of elasticity. The flexible member is coupled to the spinal rod, and includes an elongated body having a first end portion and a second end portion. The flexible member is formed from a second material having a second modulus of elasticity that is different from the first modulus of elasticity. The fixation member includes a threaded body portion and a head portion defining a hole therethrough. A portion of the flexible member extends through the hole of the head portion.