Devices, systems and methods for dynamically stabilizing the spine are provided. The devices include an expandable spacer having an undeployed configuration and a deployed configuration, wherein the spacer has axial and radial dimensions for positioning between the spinous processes of adjacent vertebrae....http://www.google.se/patents/US20070173832?utm_source=gb-gplus-sharePatent US20070173832 - Systems and methods for posterior dynamic stabilization of the spine
