MODULAR PEDICLE SCREW

摘要

The present disclosure relates, in some embodiments, to spinal fixation systems that may comprise a bone screw, a body, and a pressure cap. A bone screw may comprise a head at a proximal end, a bone connection element at a distal end, and an external protrusion on a head of a bone screw. A body may comprise a proximal end, a distal end, a mounting rod receiving channel at a proximal end, and a bone screw head receiving channel at a distal end. A portion of the mounting rod receiving channel may be operable to receive a compression element. A pressure cap may comprise a proximal end, distal end, and an internal recess on a distal end. An internal recess may be configured to mate with an external protrusion of a bone screw so as to limit the movement of a bone screw.

主权项

1. A spinal fixation system, comprising:
at least one bone screw comprising
a head at a proximal end, anda bone connection element at a distal end,an external protrusion disposed on the head of the bone screw; at least one body comprising
a proximal end;a distal end;a mounting rod receiving channel disposed at the proximal end of the body; a bone screw head receiving channel disposed at the distal end of the body;
wherein the proximal end and distal end are disposed along a longitudinal axis;wherein a proximal portion of the mounting rod receiving channel comprises an internal thread for receiving a compression element; and at least one pressure cap comprising:
a proximal end;a distal end;an internal recess formed on the distal end of the pressure cap;wherein the pressure cap is configured to be disposed within the body and between a mounting rod and the bone screw;wherein the pressure cap is operable to exert pressure on the bone screw when the mounting rod is biased against the proximal end of the pressure cap; andwherein the internal recess is configured to mate with the external protrusion of the bone screw so as to limit the movement of the bone screw.