Stabilizing bone fixation element
AssigneeDePuy Synthes Products, Inc.
InventorReto Nardini
Life of this patent
Estimating the term…
Abstract
A bone fixation device includes (a) a threaded shaft extending from a proximal end to a distal end; (b) a head located at the proximal end of the shaft; (c) a connector threadably engaging the threaded shaft and movable therealong; and (d) an extension member movable between an insertion configuration for insertion through an opening in a cortex of a bone to a locked configuration when pressed against an inner surface of the cortex. The profile of the wing in the locked configuration in the plane perpendicular to the longitudinal axis of the shaft is increased relative to the insertion configuration to distribute forces transmitted between the bone fixation apparatus and the bone over an increased area of the cortex.
Claims9
A bone fixation device, comprising:
- a threaded shaft extending along a longitudinal axis from a proximal end to a distal end;
- a head located at the proximal end of the shaft;
- a connector threadably engaging the threaded shaft and movable therealong;
- and
- an extension member rotatably movable along an axis parallel to the longitudinal axis of the threaded shaft, the extension member including a portion rotatable about the threaded shaft between an insertion configuration for insertion through an opening in a cortex of a bone to a locked configuration when pressed against an inner surface of the cortex, a profile of the portion of the extension member in the locked configuration in a plane perpendicular to the longitudinal axis of the shaft being increased relative to a profile of the portion of the extension member in the insertion configuration to distribute forces transmitted between the bone fixation apparatus and the bone over an increased area of the cortex, wherein a radial extent of the portion of the extension member remains the same in the insertion and locked configurations.
Dependencies are inferred from the claim text.