Nail and screw fixation System for improving the fixation of fractures of the proximal humerus

摘要

This refers to a system of screw and Nail (1) to improve the fixation of fractures of the proximal Humerus, including at least one humeral Nail (10) inserted in a humeral Shaft (9) and comprising at least one proximal transverse Hole (5) for the passage of a screw. ABA (3),The screw (3) has a Screw Head (4) and a Screw Body (31), advantageously, the nail is ribbed and transverse Hole (5) comprises a pair of opposed Holes (6 ',6 '') on opposite walls of the nail ribbed (10); The Hole (6) is closer to the screw Head (4) has a partially internal threaded portion (28) and the corresponding screw (3) has an outer thread diameter smaller than the diameter of said at least one hole Transverse (27) that receives the screw.The partially threaded portion (28) works as a Screw Nut portion but does not interfere with the normal Screw during insertion.In case of an unwanted movement or displacement of the screw (3) after its Final adjustment or during use, the threaded portion (28) Solves the problem of coupling of the threaded portion of the screw (3) in at least one way from Crest to Crest.