Locking and lagging bone screws
AssigneeDePuy Synthes Products, Inc.
InventorsDaniel Vennard, William Miller
Life of this patent
Estimating the term…
Abstract
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).
Claims21
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.
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, the first shaft end opposite the second shaft end in a first direction 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 independently of the shaft about the central axis when the shaft and the head are in a fully assembled configuration, 2) the first shaft end faces the second head end, and 3) the second head end is positioned closer to the first head end with respect to the first direction than any point on the shaft is positioned from the first head end with respect to the first direction.
A kit comprising:
- a locking and lagging bone screw including a head, and further including a shaft that is elongate along a longitudinal axis and rotatable relative to the head about the longitudinal axis when the head and the shaft are in a fully assembled configuration;
- a plate including a first surface, a second surface opposite the first surface, and an inner surface that defines a hole that extends from the first surface to the second surface,
- wherein the plate is configured such that the locking and lagging bone screw is insertable into the hole at a plurality of angles.
Dependencies are inferred from the claim text.