US 2025/0017629 A1 · SELECTIVELY LOCKING POLYAXIAL SCREW

Abstract

The present disclosure generally relates to pedicle screws that can selectively lock polyaxial motion of a receiver head with a locking cap. The locking cap can allow locking of the polyaxial motion of the receiver member relative to the spherical head of the bone shank without having a rod placed in the rod slot of the receiver member. This can enable placement of the head of the pedicle screw in a desired position and orientation, locking the head in the desired position and orientation, and performing a maneuver, such as derotation, without a rod in place or any extra motion between the receiver member and the bone shank. In some embodiments, actuation of the locking cap can be achieved by rotating the locking cap relative to the receiver member, where rotation of the locking cap causes corresponding axial translation of the locking cap relative to the receiver member.

Claims19

Dependent claims

A bone screw assembly, comprising:

a threaded shank having a proximal head portion;
a receiver member disposed around the proximal head portion such that a distal portion of the threaded shank extends through a hole formed in a distal end of the receiver member;
and
a locking cap disposed in the receiver member proximal to the proximal head portion of the threaded shank, the locking cap including one or more projections formed on an outer surface thereof that are disposed within a thread form on an interior surface of the receiver member;
wherein the locking cap moves between an unlocked configuration, in which the receiver member can move polyaxially relative to the threaded shank, and a locked configuration, in which the receiver member is prevented from moving relative to the threaded shank;
wherein the interior surface of the receiver member includes a non-threaded portion proximal to the thread form that receives the one or more locking cap projections.

3 more elements

Dependencies are inferred from the claim text.

Selectively locking polyaxial screw

Life of this patent

Selectively locking polyaxial screw

Life of this patent

Abstract

Claims19