A spinous process spacer implant for relief of back pain is disclosed. The implant, a generally H-shaped device having grooved ends, is made of human allograft or other suitable artificial or natural material. It is sized for implantation between and optional attachment to adjacent spinous processes....http://www.google.de/patents/US20060247634?utm_source=gb-gplus-sharePatent US20060247634 - Spinous Process Spacer Implant and Technique
