A minimally invasive orthopedic bone attachment
system comprising a
pedicle screw and guide support sleeve for
insertion of the screw. The
pedicle screw is a self-boring, self-tapping integral screw having a distal sharply pointed end for guiding the
insertion of the screw as well as forming a borehole for the self-tapping threads of the screw. The proximal end of the screw provides a cylindrical extension which can include a recess for receiving a rotational drive tool or
wrench. The length of the threads and the type of threads provided in the screw are designed for the type of
orthopedic surgery that is intended. A relatively thin hollow support sleeve including an internal threaded section in the distal end is provided to match the threads and the length of the threaded portion of the
pedicle screw. The proximal end of the sleeve includes a central passageway having an internal
diameter that can receive the extension portion of the screw and also guide and receive a drive device for the screw. A
retainer clip associated with circumferential slots spacedly indexed along the longitudinal surface of the drive device can be used to limit the depth of the screw upon
insertion as well as to lock the drive device as an
assembly with the screw and sleeve to form the attachment
system. A small
diameter passageway can be provided along the longitudinal axis of the
assembly extending from the proximal end of the drive device through the screw to exit through the pointed distal end of the screw. A thin
rigid rod having a point at the distal end is slidably positioned within the narrow passageway. The proximal end of the road includes a cap. A
flange surface on the under portion of the cap limits the travel of the rod through the
assembly. The length of the rod is determined so that it equals the length of the assembly plus an additional dimension corresponding to the anticipated installed depth of the screw. Prior to insertion of the screw, the rod is driven into the bone through the assembly. The location of the rod is ascertained by an
image guidance system to determine the correct final projected location of the screw upon installation.