Polyaxial locking mechanism

摘要

A bone plate system comprises a bone plate including a first surface and a second surface, the bone plate including at least one threaded aperture, the threaded aperture being tapered between the first surface and the second surface. The bone plate system further comprises at least one fastener including an elongate shaft and a threaded head, the threaded head being tapered between a proximal end of the threaded head and a distal end of the threaded head, wherein a plurality of circumferentially spaced recesses are formed in the threaded head and define a plurality of threaded tabs. The at least one fastener is configured for insertion within the at least one threaded aperture at a plurality of different insertion angles while achieving a locking engagement between the threaded head and the threaded aperture.

主权项

1. A bone plate system, comprising:
a bone plate including a first surface and a second surface, the bone plate including at least one threaded aperture, the threaded aperture being conically tapered between the first surface and the second surface at a constant first taper angle defined between a longitudinal axis of the threaded aperture and an internally threaded surface of the threaded aperture; and at least one fastener including an elongate shaft and a threaded head, the threaded head being conically tapered between a proximal end of the threaded head and a distal end of the threaded head at a second taper angle defined between a longitudinal axis of the threaded head and an externally threaded surface of the threaded head, wherein a plurality of circumferentially spaced recesses are formed in the threaded head and define a plurality of threaded tabs; wherein the first taper angle is greater than the second taper angle; and wherein the at least one fastener is configured for insertion within the at least one threaded aperture at a plurality of different insertion angles while achieving a locking engagement between the threaded head and the threaded aperture.