Orthopedic fixation devices and methods of installation thereof

摘要

The present invention is generally directed to orthopedic fixation devices that comprise a coupling element and a bone fastener, whereby the bone fastener can be loaded into the coupling element through the bottom of a bore in the coupling element. The orthopedic fixation devices described herein can include modular locking clamp assemblies that can be fixed onto fasteners that are already implanted in bone. The modular locking clamp assemblies can include polyaxial locking clamp assemblies, as well as monoaxial locking clamp assemblies.

主权项

1. A fixation system comprising:
a fastener including a shaft member and a head member; and a tulip assembly attachable to the head member of the fastener, the tulip assembly including:
a tulip element including a pair of arms forming a channel for receiving a rod member therein;a wedge element received in the tulip element;a clamp element attachable to the wedge element, the clamp element including at least one opening for receiving one or more portions of a ring element therein; anda ring element having at least one protrusion for inserting into the at least one opening in the clamp element, wherein engagement between the ring element and the clamp element converts the tulip assembly from a polyaxial assembly to a uniplanar assembly.