Compression-distraction spinal fixation system and kit

摘要

Compression-distraction spinal fixation systems, and methods of performing compression-distraction spinal fixation, are provided that include screw-rod constructs having a ratcheting mechanism. Bone screws of the screw-rod constructs can have a pawl that engages ratchet teeth on the rod of the screw-rod construct. The bone screw can be unidirectionally ratcheted along the length of the rod to apply compressive or distractive forces. Tools for manipulation of the screw-rod constructs are also provided, which tools include distal tips configured to engage the bone screws.

主权项

1. A compression-distraction spinal fixation system comprising:
a bone screw comprising a pawl; and a toothed rod having a plurality of ratchet teeth, wherein the pawl includes a blade portion arranged to engage the ratchet teeth on the toothed rod when the pawl is in a first position, wherein the bone screw is releasably coupled to the toothed rod and selectively moveable in a movement direction having a movement axis along the toothed rod, wherein the blade portion extends from the bone screw in a direction along the movement axis and engages the ratchet teeth of the toothed rod to allow unidirectional movement of the bone screw in the movement direction along the toothed rod, and wherein the pawl is rotatable from the first position relative to the toothed rod to disengage the pawl from the ratchet teeth on the toothed rod, wherein the pawl is rotatable approximately 180° from the first position to a second position, to engage the blade portion with the ratchet teeth on the toothed rod.