Locking distractor with two-start distraction screw

摘要

Various exemplary embodiments relate to a distractor system including one or more of the following: a distraction screw comprising a double threaded distal portion and a nonthreaded locking feature near a proximal end of the distraction screw; a crossbar; a first arm coupled to the crossbar; a second arm coupled to the crossbar and having an interior bore sized to receive at least a portion of the distraction screw; and a lock having a nonthreaded aperture sized to receive at least a portion of the distraction screw therethrough, wherein the lock is configurable in a first position and a second position, when configured in the first position the lock engages the locking feature to substantially inhibit axial movement of the distraction screw within the interior bore, and when configured in the second position the lock substantially permits axial movement of the distraction screw within the interior bore.

主权项

1. A distractor system comprising:
a distraction screw comprising a double threaded distal portion and a nonthreaded locking feature near a proximal end of the distraction screw; a crossbar; a first arm coupled to the crossbar; a second arm coupled to the crossbar and having an interior bore sized to receive at least a portion of the distraction screw; a key provided to engage a slot formed along the length in at least one of a distal arm portion of the first arm or the second arm, the key having a body portion configured to extend thorough at least one of the distal arm portions to engage a cap member and a button portion, the body portion having a nonthreaded aperture sized to receive at least a portion of the distraction screw therethrough and the button portion configured to engage a biasing member, the slot being configured to receive the key therein to engage the distraction screw, wherein the key is configurable in a first position and a second position, and when configured in the first position the key engages the locking feature to substantially inhibit axial movement of the distraction screw within the interior bore, and when configured in the second position the key substantially permits axial movement of the distraction screw within the interior bore; a biasing member provided between the button portion of the key and a first side of the distal arm portion; and, a cap member provided to engage an opposing second side of the distal arm portion and configured to attach to an end portion of the key to retain the key in the slot when inserted therein.