摘要:
A polyaxial bone screw assembly includes a threaded shank body integral with an upper capture structure and a head having an inner cavity for receiving the capture structure. The capture structure is threaded and the head includes a threaded opening for rotatable assembly with the capture structure and eventual locking frictional engagement between the capture structure and the head.
摘要:
A dynamic fixation medical implant having at least two bone anchors includes a longitudinal connecting member assembly having an elongate core and an outer sleeve. The core may be substantially cylindrical, of one-piece construction, and includes end portions for attachment to the bone anchors. A portion of the core extending between the bone anchors has at least one slit. The outer sleeve may include compression grooves. The sleeve surrounds the core and extends between the pair of bone anchors, the sleeve being compressible in a longitudinal direction between the bone anchors.
摘要:
Bone screw assemblies include longitudinal connecting members that provide for dynamic stabilization, some including non-uniform portions that are configured to flex, contract or expand. Composite longitudinal connecting members include longitudinal segments made from different materials having different flexibilities. Polyaxial bone screw assemblies include change-out receivers for cooperating with replacement longitudinal connecting members having a different flexibility. Bone screw shanks for cooperating with one or more open receivers include treatment or coating to provide biologically active interface with bone.
摘要:
A polyaxial bone screw assembly includes a threaded shank body having an upper portion, a receiver member or head, a retaining and articulating structure, and a pressure insert disposed between the shank upper portion and a rod. The receiver has a U-shaped cradle defining a channel for receiving a spinal fixation rod. The channel communicates with a receiver cavity and further with a restrictive opening that allows for loading the shank upper portion into the receiver but prevents passage of the retaining and articulating structure out of the receiver. The retaining and articulating structure has an external substantially spherical surface that mates with an internal surface of the receiver cavity, providing a ball joint, enabling the receiver to be disposed at an angle relative to the shank body. The pressure insert presses upon the shank upper portion and not the retaining and articulating structure and is either side or top loadable. The insert engages with an inner surface of the receiver to provide for the setting of an angle of articulation between the shank and the receiver. In a ratcheted embodiment, the insert may be used to independently lock the angle of orientation between the shank and the receiver.
摘要:
A modular, multi-articulated patient support system includes independently adjustable columns connected by an adjustable base and supporting a patient support structure. Each column includes rotation, angulation, separation and lateral travel structure. The patient support may be raised, lowered and rotated about a transversely shiftable longitudinal axis in either horizontal or tilted orientation. The patient support includes a body support rotatably coupled with right and left leg supports disengageable at the outboard ends, that can be tilted, rotated and locked in place. An intermediate brace engages the base when the outboard ends of the leg supports are disengaged. The patient support structure may include two pairs of patient supports, each attached at the outboard end of a column and having a free inboard end. A coordinated drive system raises, lowers, tilts, rotates and laterally shifts the patient supports, which may be positioned in overlapping relation. The pairs of patient supports may be rotated in unison to achieve 180° repositioning of a patient.
摘要:
A modular, multi-articulated patient support system includes independently adjustable columns connected by an adjustable base and supporting a patient support structure. Each column includes rotation, angulation and separation adjustment structure. The patient support may be raised, lowered and rotated about a longitudinal axis in either horizontal or tilted orientation. The patient support includes a body support rotatably coupled with right and left leg supports disengageable at the outboard ends, that can be tilted, rotated and locked in place. An intermediate brace engages the base when the outboard ends of the leg supports are disengaged. The patient support structure may include two pairs of patient supports, each attached at the outboard end of a column and having a free inboard end. A coordinated drive system raises, lowers, tilts and rotates the patient supports, which may be positioned in overlapping relation. The pairs of patient supports may be rotated in unison to achieve 180° repositioning of a patient.
摘要:
A tool set for implanting bone screws in a human spine, followed by the implantation of a rod into the bone screws includes end guide tools having flexible back wall flaps that receive opposite ends of the rod and intermediate guide tools that hold the rod in intermediate locations between the end guide tools. Both the end and intermediate guide tools include an attachment structure for operably connecting the guide tool to a bone screw. For bone screw implantation, the end guide tools and intermediate guide tools are assembled with a multi-function installation tool and a bone screw driver. Both the installation tool and driver are coaxial with the guide tool and rotatingly mateable to the guide tool. The multi-function installation tool includes a sleeve that extends substantially about the guide tool providing stability during bone screw installation. The sleeve also operatively functions as a rod pusher that abuts the rod as the sleeve is translated along the guide tool and toward the bone screw. A method utilizing the tool set allows a surgeon to percutaneously implant the bone screws and the rod in the patient.