Screw insertion instrument

摘要

An instrument for selectively coupling with a pedicle screw is disclosed. The instrument includes an inner shaft, wherein the distal tip is configured to engage a pedicle screw and the proximal end configured to be selectively engaged with a knob, and a knob assembly configured to advance over the inner shaft, wherein the distal end is configured to engage the tulip of the pedicle screw and the proximal end is configured to selectively engage the inner shaft. A method for selectively coupling the instrument to a pedicle screw is also disclosed.

主权项

1. An insertion instrument, comprising:
an inner shaft having an elongate body with proximal and distal ends, the distal end of the inner shaft having a tip configured to engage a pedicle screw; and a knob assembly, including:
a tubular body having proximal and distal ends defining a first longitudinal bore, the first longitudinal bore adapted to rotatably and translatably support the inner shaft, wherein the distal end of the tubular body is configured to engage a tulip of the pedicle screw; anda knob having proximal and distal ends, the knob defining a second longitudinal bore, the second longitudinal bore configured to be slidably and non-rotatably supported by the proximal end of the tubular body, wherein the knob is selectively engageable with the inner shaft,wherein the inner shaft extends through and proximally from a proximal surface defined on the proximal end of the knob.