Variable Angle Humeral Components

摘要

A variable angle locking system comprising a humeral component having an underside at least partially defined by a cavity; a humeral stem couplable to the humeral component; a first washer defining a first through-hole and including a threaded portion; an adaptor defining a second through-hole and having a shelf portion and an elongated second washer, the shelf portion being adapted to be received by the cavity of the humeral component; a spring washer positioned between the first washer and the elongated second washer and defining a third through-hole; and a screw configured to lock the humeral component to the humeral stem at more than one angle relative to a common axis defined by the first, second and third through-holes, the screw including a head portion having helical threads and an elongated shaft portion extending from the head portion.

主权项

1. A variable angle locking system for a humeral head including a head cavity and a humeral stem couplable to the humeral head, the variable angle locking system comprising
a first washer including an exterior surface and interior threads; an adaptor including a shelf portion and an elongated second washer, wherein the shelf portion is adapted to be received by the head cavity of the humeral head, the shelf portion including an interior surface defining a threaded portion and a non-threaded portion; a cap having an interior surface and a threaded outer surface configured to engage the threaded portion of the shelf portion, wherein the interior surface of the cap and the non-threaded portion of the shelf portion cooperatively define a distal cavity when threaded; and a screw configured to lock the humeral head with respect to the humeral stem, the screw including an elongated shaft portion extending from a head portion including threads configured to engage the interior threads of the first washer, wherein the first washer, a portion of the elongated second washer, and the head portion of the screw are disposed within the distal cavity.