A pivotal bone screw assembly includes a shank with a threaded body having an upper capture portion at a proximal end, a receiver, and a retainer made from at least two discrete retainer pieces. The upper capture portion of the shank is uploaded into the receiver after the retainer is pre-loaded into the receiver. The upper capture portion of the shank includes an internal drive socket surrounded by an upward-facing planar top surface, and the threaded body includes an axial bore centered about the longitudinal axis of the shank and extending distally from the internal drive socket to a distal tip thereof.

The present disclosure includes bone screws and assemblies thereof for surgical procedures of the spine including but not limited to posterior spinal fixation procedures.

This application describes surgical instruments and implants for building a posterior fixation construct across one or more segments of the spinal column. Extension guides are provided that attach to bone anchors implanted within the spine. The extension guides have a guide channel that align with a rod channel in the anchor to help direct the rod to the anchor. Instruments are provided to aid in insertion and positioning or the rod.

Connector assemblies, systems, and methods thereof. A connector has a first end that clamps to a first rod in an existing construct and a second end, connected to the first end, that clamps to a second rod in a new construct such that the new construct can be extended from the existing construct at an adjacent level as the existing construct.

A dynamic longitudinal connecting member assembly includes an anchor member having an integral or otherwise fixed elongate core of circular or non-circular cross-section. The core is pre-tensioned and extends through at least one elastic spacer and at least one outer sleeve. The anchor member and the outer sleeve each attach to at least one bone anchor. In operation, the core is held in tension by the spacer.

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.

A surgical navigation system is provided to create a plan to correct a deformed spinal alignment. A processor is configured to obtain a first set of image data associated with a deformed alignment in a spine of a patient from at least one imaging device. The processor is also configured to process the first set of image data to identify a set of deformed alignment parameters associated with the deformed alignment. The processor is further configured to identify a set of corrected alignment parameters. The processor is also configured to process the first set of image data, the set of deformed alignment parameters, and the set of corrected alignment parameters to generate a correction plan to surgically manipulate the deformed alignment to the preferred alignment. The processor is additionally configured to provide navigation through the correction plan to facilitate surgical manipulation of a patient spine to the preferred alignment. The processor is also configured to receive information relating to forces on a rod-link reducer or surgical implants from strain gauges to aid the correction plan.

The present disclosure includes bone screws and assemblies thereof for surgical procedures of the spine including but not limited to posterior spinal fixation procedures.

A method and system for improving spinal alignment parameters of a subject, by planning the shape of an intervertebral rod for attaching to previously implanted hardware whose positions and orientations are known from intraoperative images. Once the planned shape of the rod has been prepared, determining if, when attached to the inserted hardware, a spine configuration is achieved having acceptable values of selected spinal alignment parameters. If not, the shape of the rod is amended iteratively, until the selected spinal alignment parameters have acceptable values with attachability to the implanted hardware. If, after a predetermined number of iterations, the amended shape of the rod still does not achieve acceptable values of spinal alignment parameters, while maintaining attachability to the implanted hardware, performing a spinal manipulation procedure on at least one vertebra of the spine to increase the attachability of the rod to the implanted hardware.

A spinal distraction system includes a distraction rod having a first end and a second end, the first end being configured for affixation to a subject's spine at a first location, the distraction rod having a second end containing a recess having a threaded portion disposed therein. The system further includes an adjustable portion configured for affixation relative to the subject's spine at a second location remote from the first location, the adjustable portion comprising a housing containing a magnetic assembly, the magnetic assembly affixed at one end thereof to a lead screw, the lead screw operatively coupled to the threaded portion. A locking pin may secure the lead screw to the magnetic assembly. An O-ring gland disposed on the end of the housing may form a dynamic seal with the distraction rod.