Patent ID: 8900308
Filing Date: 2014-12-02
Classification: A61F

Abstract:
1. A spacer for insertion between two vertebrae, said spacer having a variable axial length and comprising: a first member having a hollow interior and a tubular wall; a second member having a hollow interior and a tubular wall, the second member being slidable within the first member in an axial direction for adjusting an overall length; and a third member having a hollow interior and a tubular wall and forming a first double cage structure with one of the first member and the second member; wherein the double cage structure comprises two rings of prongs, one ring of prongs located radially inside the other ring of prongs, and wherein a plurality of prongs from each of the two rings of prongs extend generally in the same direction and free ends of the plurality of prongs from each of the two rings of prongs are arranged to contact a first vertebra when the spacer is located between two vertebrae.