The disclosed seat belt tensioner is for a seat belt safety system that may comprise a seat belt spindle, a drive motor for driving the seat belt spindle, and a gear connected to the drive motor. In one embodiment, the semiconductor layer is formed on a cladding layer. A communication network system, a communication node in a communication network, and a computer program product include similar features. The attachment element may be configured to be fastened to at least one of the upper and the lower vertebrae to at least partially secure in place said one of the upper and lower articular portions. A scissors linking assembly is connected to the base plate and includes a first linking member and a second linking member.