Locking and lagging bone screws

摘要

A locking and lagging bone screw. The screw includes a head having an outer surface which is at least partially threaded and a shaft which is at least partially threaded having a first end coupled to the head and a second end adapted to be fastened to bone. The head of the screw is able to rotate independently of the shaft. Thus, the head of the screw can be locked to a bone plate by using a first driver (e.g., a torx driver) and the plate can be lagged to the bone by using a second driver (e.g., a hex driver).

主权项

1. A locking and lagging bone screw comprising:
a shaft elongate along a central axis, the shaft including a first shaft end and a second shaft end opposite the first shaft end along the central axis; a head including a first head end and a second head end opposite the first head end, the head configured to be coupled to the shaft such that: 1) the head is rotatable about the central axis independently of the shaft, 2) the first shaft end faces the second head end, and 3) the first shaft end is spaced from the second head end along the central axis by a gap; and a connection screw configured to bridge the gap and couple the head to the shaft; wherein, when the head and the shaft are in a fully assembled configuration, 1) the connection screw is rotatable relative to the head about the central axis, and 2) the connection screw is the only portion of the locking and lagging screw that bridges the gap.