Spinal fusion cage

摘要

The invention is directed to a spinal fusion cage for implantation between two adjacent vertebrae, wherein the total cage has, under a load, a maximum compression that is higher than 0.05% of the original height of the spinal fusion cage and the maximum compression does not change the structural integrity of the cage.

主权项

1. A spinal fusion cage for implantation between two adjacent vertebrae, the spinal fusion cage comprising at least first and second polymeric materials present as layers, wherein a layer of the second polymeric material is embedded between two layers of the first polymeric material, and the first and second polymeric materials are chemically or physically connected to one another, and wherein the first polymeric material of the spinal fusion cage has a tensile modulus between 0.001 and <1.0 GPa, and wherein the second polymeric material of the spinal fusion cage has a tensile modulus between 1.0 and 20 GPa, and wherein the spinal fusion cage has a maximum compression that is higher than 0.05% of an original height of the spinal fusion cage, wherein the maximum compression is defined as a difference in millimeters (mm) between original and compressed heights of the spinal fusion cage at a load equal to a stress level of 2 MPA working on contact areas thereof wherein the maximum compression does not change structural integrity of the cage.