An implant system is disclosed. The system may include an implant receiver having a base and a first arm and a second arm extending from the base in a longitudinal direction towards an open end. The first arm and second arm may define a receiving cavity therebetween. The first and second arm may each include an outside thread pattern for rotatably supporting a nut movable in the longitudinal direction and an inside thread pattern for rotatably supporting a set screw movable in the longitudinal direction. A rod may be selectively positioned within the receiving cavity at an intermediate elevation between the base and the open end and the rod may be supported by the nut. The set screw may be tightened against the rod thereby locking the rod and nut at the intermediate elevation. In some embodiments, the first and second arms may include a plurality of breakoff locations.

A dynamic fixation medical implant having at least two bone anchors includes a longitudinal connecting member assembly having rigid sleeves for attachment to the bone anchors, at least one spacer engaging the bone anchors and the sleeves, and in some embodiments, an end elastic bumper. A flexible cord is initially slidingly received within the rigid sleeves, the spacer and the bumper. The spacer may include an optional inelastic inner liner, with at least one of the sleeves having an extension slidingly receivable within the liner. Some sleeves include apertures for receiving a closure top portion for locking the cord against the sleeve, or alternatively receiving a closure top that does not extend into the aperture, the slip or grip option provided by the aperture in each sleeve resulting in an overall connector with variable segmental stiffness.

A polyaxial bone screw assembly includes a threaded shank body having an integral upper portion receivable in an integral receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. The receiver can have crimp tabs, but is devoid of spring tabs and collet-like flexible structures. A down-loadable compression insert (some with lock and release feature), a down-loadable friction fit split retaining ring and an up-loadable shank upper portion cooperate to provide for pop- or snap-on assembly of the shank with the receiver either prior to or after implantation of the shank into a vertebra. The shank and receiver once assembled cannot be disassembled. The receiver and insert include aligned tool receiving apertures for lock and release of the polyaxial mechanism.

A bone anchoring device for anchoring a rod to a bone or vertebra includes a receiving part having two legs defining a channel for the rod, and a rod receiving member positionable in the channel, the rod receiving member including an upper surface and a lower surface defining a longitudinally extending passage for receiving the rod and respectively configured to restrict upward and downward movement of a rod received in the passage. The rod receiving member is adjustable from a first configuration where the passage is unobstructed and the rod is movable longitudinally through the passage, to a second configuration where an engagement surface attached to other portions of the rod receiving member is advanced axially into the passage to engage the rod while a rotational orientation of the engagement surface remains constant to restrict movement of the rod in the passage.

Systems, devices, and associated methods for correcting spinal column deformities that help minimize a number of attachment anchors utilized for correction, facilitate use of straight or contoured rods, and/or help promote a more natural, physiologic motion of the spinal column.

An insert for convertibly anchoring an artificial ligament tether in a tulip of a spinal fixation construct. A prior art tulip has a socket with opposite end openings and configured in size and shape to receive a spinal longitudinal support rod. A tulip also has a clamping screw threadedly engaged to the tulip to clamp a support rod in the socket. The invention is an insert body having an exterior configured to conformingly seat against a surface of the tulip socket and also having a passageway extending entirely through the insert body in a direction to extend between the end openings of the tulip. A surgeon inserts a tether through the passageway and rotates the clamping screw to translate the clamping screw against the insert body. Rotation of the clamping screw clamps the tether to the insert body and clamps the insert body to the tulip.

A method for surgically preparing a spinal fixation construct that includes a first support rod and a tulip with a socket shaped to receive a second support rod. A tether anchor is installed in the tulip socket and a tether is fixed to the tether anchor and to a vertebra. In a subsequent revision surgery, the tether and the tether anchor are removed. Then a second support rod is installed in the socket of the tulip. Preferably, before installing the tether anchor, a first end of a rod-to-rod connector is connected to the first support rod. The second, opposite end of the rod-to-rod connector has the tulip socket formed on it to which the tether anchor is initially installed. In the subsequent revision surgery, after removal of the tether anchor, the second support rod is installed in the socket of the tulip on the rod-to-rod connector.

A pivotal bone anchor assembly includes a receiver having a first channel configured to receive an elongate rod and an axial bore with a bottom opening, and a shank having a head portion positionable into the axial bore with the shank extending downward through the bottom opening. The assembly also includes an insert positionable into the axial bore above the head portion and having a second channel alignable with the first channel, opposite extensions extending outwardly in the direction of the channels to block rotation between the receiver and the insert, and upward-facing surfaces located radially outward from a central opening. The upward-facing surfaces are configured for releasable compressive engagement by a compressing tool after the elongate rod is received within the channels and prior to a final locking of the assembly with a closure top, so as to provisionally lock the shank from pivoting with respect to the receiver.

A system includes a first pedicle screw, a second pedicle screw, and an adjustable rod having an outer housing coupled to one of the first pedicle screw and the second pedicle screw, the outer housing having a threaded shaft secured to one end thereof extending along an interior portion thereof. The system farther includes a hollow magnetic assembly disposed within the outer housing and having a magnetic element disposed therein, the hollow magnetic assembly having an internal threaded surface engaged with the threaded shaft, the magnetic assembly being coupled to the other of the first pedicle screw and the second pedicle screw, wherein the hollow magnetic assembly rotates in response to an externally applied magnetic field to thereby lengthen or shorten the distance between the first pedicle screw and the second pedicle screw.

A pivotal bone anchor assembly includes a receiver with an open channel configured to receive an elongate rod and a central bore having an inwardly protruding interference structure with a discontinuous annular upper surface. The assembly also includes a shank having a head positionable within the central bore and an anchor portion for fixation to the bone of a patient, and an insert positionable into the central bore in an initial position that is constrained from vertical movement in at least one direction by engagement between outer curvate side surfaces of the insert and the discontinuous annular upper surface. The insert is configured for forced downward displacement within the central bore by tooling from the initial position to a lower position in which the outer curvate side surfaces of the insert are wedged against the interference structure to inhibit the insert from moving back up within the central bore.