A device for facilitating bone fusion of two vertebrae. The device is sized and shaped to at least extend between the two vertebrae to be fused, and includes an outer wall member disposed about an inner portion. A space between the outer wall member and the inner compartment is adapted to contain an...http://www.google.es/patents/US7799079?utm_source=gb-gplus-sharePatente US7799079 - Vertebral fusion device and method
