Bone fixation device
AssigneeZimmer Biomet Spine, Inc.
InventorsTara Ziolo, Rui Ferreira
Life of this patent
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Abstract
A bone fixation apparatus is provided and includes a bone fixation plate having a fixation hole, a fastener shaft having a bone-anchoring portion and an upper portion defining an outer cam, and a C-shaped annular member having an outer surface, an inner surface defining an inner cam, and a gap formed through the entire annular member. The inner cam cooperates with the outer cam of the fastener shaft to move the annular member between an unexpanded position and an expanded position independent from movement of the fastener shaft relative to the bone fixation plate.
Claims20
A bone fixation apparatus comprising:
- a bone fixation plate having a fixation hole;
- a fastener shaft having a bone-anchoring portion and an upper portion defining an outer cam;
- and
- a C-shaped annular member having an outer surface, an inner surface defining an inner cam, and a gap formed through the entire annular member, the inner cam cooperating with the outer cam of the fastener shaft to move the annular member between an unexpanded position and an expanded position independent from movement of the fastener shaft relative to the bone fixation plate.
A bone fixation apparatus comprising:
- a bone fixation plate having a fixation hole;
- a fastener shaft having a longitudinal axis extending between a first end and a second end thereof;
- a circumferential groove formed in the fastener shaft and having at least one cam surface;
- and
- an annular member having an inner surface cooperating with the at least one cam surface to radially expand the annular member from an unexpanded position to an expanded position when the fastener shaft is in a fixed position relative to the bone fixation plate, the annular member including separated ends defining a gap therebetween, the gap formed through the entire annular member.
A bone fixation apparatus comprising:
- a bone fixation plate having a fixation hole;
- a fastener shaft having a longitudinal axis extending between a first end and a second end thereof;
- a circumferential groove formed in the fastener shaft and having at least one cam surface;
- and
- an annular member having an inner surface cooperating with the at least one cam surface to selectively expand the annular member from an unexpanded position to an expanded position independent of movement of the fastener shaft relative to the bone fixation plate, the annular member including separated ends defining a gap therebetween, the gap formed through the entire annular member.
Dependencies are inferred from the claim text.