This chapter describes the mechanical construction and the electronic components of
the exoskeleton. It is organized as follows: In the following section 6.1 general requirements
of an exoskeleton to support the knee joint are specified. Those requirements
lead to a design which is described in section 6.2. The actuation of this exoskeleton is
described in section 6.3, followed by the sensors in 6.4, the data processing unit in 6.5,
and the communication structure that connects all components in section 6.6. Safety
issues are discussed in section 6.7 before the chapter is closed with a summary of the
properties of the exoskeleton in section 6.8.