Patent ID: 11969357
Assignee: K2M, INC.
Field: Medical technology (Instruments)
Classification: CPC A  B | IPC A  B

Claim 0:
1. An intervertebral spacer assembly comprising:
an intervertebral spacer, the intervertebral spacer comprising:
a superior surface configured to engage a superior vertebral body;
an inferior surface configured to engage an inferior vertebral body and;
at least one bone graft channel oriented to pass through opposing ends of the intervertebral spacer;
a proximal surface comprising:
a first fastener channel configured to receive a first fastener, the first fastener channel oriented to pass through the proximal and superior surfaces of the intervertebral spacer at a first angle;
a second fastener channel configured to receive a second fastener, the second fastener channel oriented to pass through the proximal and inferior surfaces of the intervertebral spacer at a second angle; and
a locking member channel intermediate the first and second fastener channels, the locking member channel comprising:
an inner wall;
an annular ridge formed in the inner wall, the annular ridge being spaced apart from the a least one bone graft channel;
a first pair of recesses formed in the inner wall; and
a second pair of recesses formed in the inner wall and angularly offset from the first pair of recesses about a longitudinal axis of the locking member channel wherein the locking member channel extends from a proximal end of the intervertebral spacer to the at least one bone graft channel; and

a locking member comprising:
a first anti-backout member;
a second anti-backout member; and
a collet comprising:
an annular flange configured to be retained by the annular ridge of the locking member channel in order to rotatably couple the locking member to the intervertebral spacer;
a peripheral wall;
a first stop protrusion projecting from a first side of the peripheral wall; and
a second stop protrusion projecting from a second side of the peripheral wall, opposite the first stop protrusion; wherein:
the locking member is rotatable within the locking member channel between two stable positions comprising an unlocked position and a locked position;
in the unlocked position, the first and second stop protrusions protrude into the first pair of recesses in order to retain the locking member in the unlocked position, and the first and second anti-backout members do not obstruct the first and second fastener channels; and
in the locked position, the first and second stop protrusions protrude into the second pair of recesses in order to retain the locking member in the locked position, and the first and second anti-backout members obstruct the first and second fastener channels in order to prevent the first and second fasteners from backing out of the first and second fastener channels.