MULTIDIRECTIONAL PIVOTING BONE SCREW AND FIXATION SYSTEM

摘要

A double-jointed bone bolt (1) for use in an apparatus for maintaining vertebra in a desired relationship. The apparatus has a rod (3) that extends substantially along the spine and one or more bone bolts. At least one of the bone bolts is double jointed. The double-jointed bolt has a mounting portion (42) with a hook or coarse threads to engage a vertebra, and the mounting portion is attached to a pivot post (43) in a manner that allows the pivot post to be rotatable about a common axis in respect to the mounting portion. The pivot post of the bone bolt is then pivotally attached to a connector portion (44) of the bone bolt that has machine threads upon which a surgeon may attach a clamp. (2) The clamp has a second bolt (4) and an arm. (5) The second bolt holds the rod and the arm to the clamp. The second bolt has a first channel (8) to attach to the rod, while the arm has a second channel (10) to attach the double-jointed bone bolt.