摘要:
A cannulated bone anchor comprising a self-centering ball-joint suitable for use in a spine stabilization prosthesis which supports the spine while providing for the preservation of spinal motion. The cannulated bone anchor has a deflectable ball-rod partially received in a socket of a housing formed in the head of the bone anchor. A centering rod received partially in the ball-rod and partially within the housing operates to align the ball-rod with the longitudinal axis of the bone anchor. Deflection of the ball-rod bends the centering rod which in turn applies a restoring force upon the ball-rod. The centering rod includes an inner-superelastic core and an outer polymer sheath.
摘要:
Compound spinal rods function as part of the dynamic stabilization prosthesis to provide load sharing with motion preservation as part of a dynamic stabilization prosthesis. Compound spinal rods are used to span from one vertebra to an adjacent vertebra. Compound spinal rods include a first rod connected by a linkage to a second rod. The linkage allows for movement of the first rod relative to the second rod. The movement permitted by the compound spinal rod is designed to enhance the ability of a dynamic stabilization prosthesis to more closely approximate the natural kinematics of the spine without impairing stabilization of the spine.
摘要:
A dynamic spinal stabilization linkage for use in stabilizing of the spine. The linkage connects adjacent vertebrae to provide load-sharing and stabilization while allowing natural kinematics. The linkage comprises three rigid bodies joined in series with 3-degree-of-freedom spherical joint between each body. The joints have range-of-motion constraints which limit undesirable intervertebral motion.
摘要:
Versatile polyaxial connector assemblies are provided for a dynamic stabilization system which supports the spine while providing for the preservation of spinal motion. Embodiments of the dynamic stabilization system include versatile polyaxial connectors in addition to bone anchors, a deflection system and a vertical rod system. The bone anchors connect the construct to the spinal anatomy. The deflection system provides dynamic stabilization while reducing the stress exerted upon the bone anchors and spinal anatomy. The vertical rod system spans different levels of the construct. The versatile polyaxial connectors include connectors mounted coaxially and/or offset with the bone anchors to adjustably connect the deflection system, vertical rod system and bone anchors allowing for safe, effective and efficient placement of the construct relative to the spine.
摘要:
A dynamic stabilization system including a flexible bone anchor and methods for assembling a dynamic stabilization assembly which supports the spine while providing for the preservation of spinal motion. The flexible bone anchor includes a flexible post mounted within a bone anchor. Deflection of the flexible post is controlled by a flexible section integrated into the flexible post. A housing encloses the flexible post isolating it from the bone and providing a stable connection point for other elements of the implant. An internal surface within the housing is positioned to limit deflection of the flexible post. The force/deflection properties of the flexible bone anchor are adapted to be configured and/or customized to the anatomy and functional requirements of the patient by changing the properties of the flexible section and housing.
摘要:
A dynamic spinal stabilization component which supports the spine while providing for the preservation of spinal motion. The component is selectably attachable to a bone anchor for implantation in a bone of the spine. The component and bone anchor provide load sharing while preserving range of motion and reducing stress exerted upon the bone anchors and spinal anatomy. The dynamic spinal stabilization component includes a deflectable post connected by a ball-joint to a threaded anchor. Deflection of the deflectable post is controlled by a centering spring. The force/deflection properties of the dynamic bone anchor may be adapted to the anatomy and functional requirements of the patient. The dynamic spinal stabilization component may be used as a component of a dynamic stabilization system which supports the spine while providing for the preservation of spinal motion.
摘要:
A dynamic spinal stabilization component which supports the spine while providing for the preservation of spinal motion. The component may be integrated in a bone anchor for implantation in a bone of the spine. The component and bone anchor provide load sharing while preserving range of motion and reducing stress exerted upon the bone anchors and spinal anatomy. The dynamic spinal stabilization component includes a deflectable post connected by a ball-joint to a threaded anchor. Deflection of the deflectable post is controlled by an axially compressible spring. The force/deflection properties of the dynamic bone anchor may be adapted to the anatomy and functional requirements of the patient. The dynamic spinal stabilization component may be used as a component of a dynamic stabilization system which supports the spine while providing for the preservation of spinal motion.
摘要:
A surgical implantation tool and method is provided for implanting a dynamic bone anchor into a vertebra. The tool has an internal bore in which the deflectable post fits and a socket which engages the bone anchor. A quick release mechanism secures the deflectable post in the bore so that the bone anchor and implantation tool are held together during implantation. The implantation tool is sized to fit through a cannula to the operative site to allow minimally invasive implantation of the dynamic bone anchor.
摘要:
A dynamic stabilization, motion preservation spinal implant system includes a deflection rod system implant. The system is modular so that various constructs and configurations can be created and customized to a patient.
摘要:
A bone anchor comprising a self-centering ball-joint suitable for use in a spine stabilization prosthesis which supports the spine while providing for the preservation of spinal motion. The bone anchor has a deflectable ball-rod partially received in a socket of a housing formed in the head of the bone anchor. A centering rod received partially in the ball-rod and partially within the housing operates to align the ball-rod with the longitudinal axis of the bone anchor. Deflection of the ball-rod bends the centering rod which in turn applies a restoring force upon the ball-rod.