Abstract:
A receiver body for an elongated spinal fixation element includes a housing portion with one or more flanges extending outwardly. In one embodiment, the receiver body includes first and second flanges extending outwardly from the housing portion. The housing portion includes first and second slots that form a passage through the housing portion. Each flange has a circular perimeter edge and a chamfered section, the chamfered section having a notched undercut for engagement with an instrument. In another embodiment, the receiver body includes a housing portion having a circular flange with a first chamfered section and a second chamfered section diametrically opposite the first chamfered section. The first chamfered section has a first aperture that opens out beneath the flange, and the second chamfered section has a second aperture that opens out beneath the flange. The first and second apertures form diametrically opposed pivot-attachment points for an instrument.
Abstract:
A rod persuader assembly includes a tubular body, an inner shaft and an outer shaft. The inner shaft is axially displaceable relative to the tubular body, and has a gripping end and a handle end. The outer shaft is axially displaceable relative to the tubular body, and has a rod reducing end. In one embodiment, the handle end is rotatable relative to the gripping end. In another embodiment, the gripping end includes a cylindrical socket. In yet another embodiment, the rod persuader assembly is operable in two separate and independent stages to secure the instrument to an implant, and advance a rod into the implant.
Abstract:
Apparatuses and methods for inserting elongated fixation elements into screw implants include one or components for visualizing the insertion process from a unique vantage point. One apparatus features a steering apparatus for adjusting the position of a receiver element on a screw implant, so that an elongated fixation element, such as a rod, can be inserted through a transverse passage in the receiver element. The steering apparatus may include an extension tube and a steering control member coupled to the extension tube. The extension tube may be configured for coupling to the receiver element, and the steering control member may be configured for coupling to the extension tube. The steering control member may include an opening for receiving an endoscope. The endoscope may be used to visually monitor the elongated fixation element as it is inserted into the transverse passage of the receiver element.
Abstract:
An instrument includes components configured to secure a locking device inside a rod fixation assembly. In one embodiment, an instrument includes an outer sleeve and a pusher member arranged telescopically within the outer sleeve. A drive assembly cooperatively engages the pusher member. In another embodiment, an instrument includes an outer sleeve, a pusher member arranged telescopically within the outer sleeve, and a pair of drive assemblies. A first drive assembly engages the pusher member to distally advance the pusher member under a first loading. A second drive assembly also engages the pusher member to distally advance the pusher member under a second loading, the second loading being substantially greater than the first loading. In another embodiment, a method for reducing and locking a spinal rod includes the step of advancing a locking element while the locking element is retained in a fixed orientation.
Abstract:
A rod persuader assembly includes a tubular body, an inner shaft and an outer shaft. The inner shaft is axially displaceable relative to the tubular body, and has a gripping end and a handle end. The outer shaft is axially displaceable relative to the tubular body, and has a rod reducing end. In one embodiment, the handle end is rotatable relative to the gripping end. In another embodiment, the gripping end includes a cylindrical socket. In yet another embodiment, the rod persuader assembly is operable in two separate and independent stages to secure the instrument to an implant, and advance a rod into the implant.
Abstract:
An instrument includes components configured to secure a locking device inside a rod fixation assembly. In one embodiment, an instrument includes an outer sleeve and a pusher member arranged telescopically within the outer sleeve. A drive assembly cooperatively engages the pusher member. In another embodiment, an instrument includes an outer sleeve, a pusher member arranged telescopically within the outer sleeve, and a pair of drive assemblies. A first drive assembly engages the pusher member to distally advance the pusher member under a first loading. A second drive assembly also engages the pusher member to distally advance the pusher member under a second loading, the second loading being substantially greater than the first loading. In another embodiment, a method for reducing and locking a spinal rod includes the step of advancing a locking element while the locking element is retained in a fixed orientation.
Abstract:
An instrument assembly includes a downtube having a tubular body with a proximal end and a distal end. In one embodiment, the proximal end forms an opening for receiving a surgical tool, and the distal end forms at least two attachment members for attaching to a bone anchor. The tubular body forms a hollow passage extending from the proximal end to the distal end. The assembly includes a key for insertion into the proximal end of the downtube to attach the downtube to a bone anchor. The key includes an engagement end configured to engage the at least two attachment members when the key is inserted into the downtube. The key is rotatable within the tubular body between a clamping orientation and a releasing orientation.
Abstract:
An instrument for manipulating a spinal fixation rod includes a gripping section for engaging a spinal implant and a lever body pivotally attached to the gripping section. A rod carrier extends from one side of the lever body and is adapted to push a spinal fixation rod downwardly into the spinal implant.
Abstract:
An instrument assembly includes a downtube having a tubular body with a proximal end and a distal end. In one embodiment, the proximal end forms an opening for receiving a surgical tool, and the distal end forms at least two attachment members for attaching to a bone anchor. The tubular body forms a hollow passage extending from the proximal end to the distal end. The assembly includes a key for insertion into the proximal end of the downtube to attach the downtube to a bone anchor. The key includes an engagement end configured to engage the at least two attachment members when the key is inserted into the downtube. The key is rotatable within the tubular body between a clamping orientation and a releasing orientation.
Abstract:
A receiver body for an elongated spinal fixation element includes a housing portion with one or more flanges extending outwardly. In one embodiment, the receiver body includes first and second flanges extending outwardly from the housing portion. The housing portion includes first and second slots that form a passage through the housing portion. Each flange has a circular perimeter edge and a chamfered section, the chamfered section having a notched undercut for engagement with an instrument. In another embodiment, the receiver body includes a housing portion having a circular flange with a first chamfered section and a second chamfered section diametrically opposite the first chamfered section. The first chamfered section has a first aperture that opens out beneath the flange, and the second chamfered section has a second aperture that opens out beneath the flange. The first and second apertures form diametrically opposed pivot-attachment points for an instrument.