Bone Screw with Deflectable Portion

摘要

An anchoring element, such as a bone screw, may comprise an at least partially threaded shaft having a core and a longitudinal channel. An elongated element movable with the channel may be a tensioning element, for example affixed to the distal portion, and/or a rigid element. The core may have one or more lateral cut-outs, which may be V-shaped, at the distal portion. Each cut-out may be backed by an effective hinge that may be displaced from the longitudinal axis, and may have a transverse slit between the hinge and an opposite surface of the core from the cut-out. Upon axial movement of the elongated element, e.g. toward a proximal end of the shaft, the distal portion may deflect to an angle from the shaft's longitudinal axis. Alternatively, the anchoring element may be pre-biased to deflect and maintained straight by a rigid element until axial movement of the rigid element.

主权项

1. An anchoring element, comprising:
a shaft having a core and a longitudinal channel, the shaft also having a distal portion and having threading along at least a portion of a length of the shaft; an elongated element movable within the channel, the elongated element being (i) a tensioning element or (ii) a rigid element or (iii) a tensioning element and a rigid element; one or more lateral cut-outs in the core at the distal portion or at a central portion of the shaft, each cut-out backed by an effective hinge, the channel traversing at least one side of one of the cut-outs, the elongated element and distal portion configured such that upon axial movement of the elongated element, the distal portion deflects to an angle from a longitudinal axis of the shaft.