Patent ID: 9622869
Date: 2017-04-18
CPC Classifications: A61F

Claim:
1. A modular reverse humeral prosthesis for implantation at least in part within a humerus, comprising: an anatomical stem having a longitudinal axis and an axial stem hole parallel to the longitudinal axis, the stem hole having an internally threaded portion; wherein the anatomical stem also has a flared metaphyseal portion; a separable epiphyseal head having a socket configured to receive a cup and a head hole that communicates with the socket, the epiphyseal head being rotatable about the longitudinal axis of the stem such that the epiphyseal head and stem can be assembled at a plurality of angular positions, the head hole configured such that the head hole and the stem hole are aligned when the epiphyseal head and the stem are assembled, the head hole having an internally threaded portion; and a screw comprising a head, a threaded portion having a screw thread that cooperates with the internally threaded portion of the head hole and the internally threaded portion of the stem hole, and a shaft between the threaded portion and the head, the head of the screw configured to be entirely disposed within the head hole of the epiphyseal head when the threaded portion of the screw cooperates with the internally threaded portion of the stem hole; wherein a proximal surface of the stem is planar about the internally threaded portion and a distal surface of the epiphyseal head is planar about the head hole; wherein at least portions of the proximal surface of the stem and the distal surface of the epiphyseal head are in contact when the epiphyseal head and the stem are assembled, and wherein the epiphyseal head comprises a lug that extends from the distal surface, the lug configured to be at least partially disposed within the stem hole when the epiphyseal head and the stem are assembled; and wherein the lug is cylindrical and the head hole extends through the lug.