The present disclosure relates generally to surgical instruments for spinal surgery. More specifically, the present disclosure relates to a bi-planar rod persuader for urging a spinal rod into a screw, and methods regarding the same. The bi-planar rod persuader may include an implant holder, which may also include a holding sleeve. A securing foot may be attached to the distal end of the holding sleeve, and the holding sleeve may also include a threaded opening at the proximal end for receiving a stem that drives the securing foot between a first position and second position. The implant holder may also include a threaded part to engage a reduction knob. A handle assembly may also be provided, which may include two pivotally attached arms. A rod hook may be connected to one of the arms and a guide attached to the other of the arms.

A coupling device includes a receiving part having a head receiving portion for pivotably receiving a head of a bone anchor and a rod receiving portion defining a recess for receiving the rod, the rod receiving portion having an engagement structure for engaging a locking member to lock the rod in the recess and a first engagement surface different from the engagement structure for engaging an instrument, wherein the first engagement surface is formed away from radially outwardly facing regions of the rod receiving portion, and a locking ring positionable around the head receiving portion and having a second engagement surface for engaging the instrument. The locking ring can assume an insertion position where the head of the bone anchor is insertable into the head receiving portion, and a pre-locking position where the head is prevented from removal from the head receiving portion.

Some embodiments relate to a pedicle screw implant construct kit, comprising: at least one pedicle screw including a head; an embracing structure shaped and sized for embracing at least a portion of the screw head; an upper fastener for mounting onto the embracing structure, the upper fastener having a polygonal profile at least on a face of the upper fastener facing a direction opposite the screw.

Instruments and methods for selectively coupling to an object are provided, for example surgical instruments that can form a rigid connection with an object and also be disassembled for cleaning, sterilization, etc. One embodiment includes an elongate shaft with a longitudinal groove, a first partial circumferential groove that intersects with a distal end of the longitudinal groove, and a second at least partial circumferential groove formed distal to the first partial circumferential groove. The instrument also includes a sleeve disposed over the elongate shaft that includes a protrusion extending from an internal wall that is received within the longitudinal groove to constrain movement of the sleeve relative to the elongate shaft. The sleeve further includes a lock that interfaces with the second at least partial circumferential groove when the protrusion is disposed in the first partial circumferential groove to further selectively constrain axial and rotational movement of the sleeve.

A bone fixation system with variable z-axis translation is provided. The system includes an outer tulip coupled to a bone fastener via a screw retainer. An inner tulip is coupled to the outer tulip such that the inner tulip is longitudinally movably relative to the outer tulip. The inner tulip includes a lock that provides a seat for a connecting rod. The inner tulip together with a seated rod is permitted to translate along the z-axis inside the outer tulip when in an unlocked position. Also in the unlocked position, the bone fastener is free to angulate relative to the outer tulip. The z-axis position of the inner tulip and rod relative to the outer tulip is fixed in a locked position. Also, in the locked position, the bone fastener is locked with respect to the outer tulip. The system may be adjusted between the locked and unlocked positions by way of a set screw.

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.

Treatment of spinal irregularities, including, in one or more embodiments, derotation apparatus and systems that can be used to reduce the rotation of vertebral bodies. Derotation apparatus that may comprise a tube assembly comprising an inner sleeve and an outer sleeve disposed over the inner sleeve. The inner sleeve may have a distal end for attachment to an implant. The tube assembly may further comprise a handle assembly. The tube assembly may further comprise a ball joint assembly disposed between the tube assembly and the handle assembly. The ball joint assembly may comprise a ball joint configured for attachment to a coupling rod. The ball joint assembly further may comprise a reducing extension below the ball joint, the reducing extension being sized to fit in a central bore of the inner sleeve. Orthopedic fixation devices comprising a ball joint are also disclosed.

A screw tower that is a single-use instrument that attaches to existing screws but remains open along a rod slot to allow for screws to intermesh and prevent interference of adjacent screws during screw and rod insertion. The screw tower interfaces with existing features of the screws to facilitate screw insertion, rod insertion, rod reduction, and locking cap insertion in a percutaneous approach. The tower is broken in half and removed from patient to end with a completed construct.

Spinal surgical procedures can benefit from a rod reduction instrument with a ratchet lock-out mechanism. The instrument can include an inner shaft, an outer housing and a ratchet mechanism. The inner shaft can include a threaded proximal portion and a distal end that includes a plurality of engagement members adapted to receive a pedicle screw. The outer housing can be slidably received over the inner shaft, and include a top sleeve and a bottom sleeve. The top sleeve can include the ratchet mechanism to selectively engage the threaded proximal portion of the inner shaft and the bottom sleeve can engage a connecting rod. The ratchet mechanism can include an engagement feature to selectively engage the threaded proximal portion of the inner shaft, and a locking mechanism to selectively lock the engagement feature of the ratchet mechanism against the threaded proximal portion of the inner shaft.

A spinal rod reducer for reducing a rod into a rod-receiving opening of a bone anchor comprises an elongate tubular body having a lumen extending therethrough and a pair of spaced flexible anchor attachment members at the distal end of the tubular body. A threaded rod reduction member having a rod contacting surface is supported for axial movement within the lumen. A threaded rotatable reduction knob is threadably engaged with the rod reduction member rotation of which causes the rod reduction member with the rod contacting surface to move axially distally toward the bone anchor. A locking sleeve is configured to axially slide on the tubular body over the attachment members, the locking sleeve including a locking element for releasably coupling the locking sleeve and the rod reduction member for selective independent and joint movement relative to the tubular body.