The invention is directed to a self-expanding stent for implantation into a body lumen, such as an artery. The data storage drive assemblies include one or more drive mechanical modules configured to store data and one or more drive control modules coupled to the drive mechanical modules. Either at the same time or at a later time, the user obtains a second gripper andor a second accessor. When an impact occurs, the deformation and the rotation of the bumper stay mounting part of the bumper beam is effectively prevented.