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Medical robotics 177

Fig. 20 A CyberKnife M6 System at the European CyberKnife Center Munich-
Großhadern, Germany, by Textefuermedizin, used under CC BY-SA 4.0, https://en.
wikipedia.org/wiki/Cyberknife#/media/File:Cyberknife_M6_und_MLC.jpg.

Fig. 21 Sensei X by Hansen Medical (Beasley, 2012), used under CC BY 3.0.

6 Rehabilitation robotics and assistive technologies
6.1 Motivations
According to the United Nations report on World Population Aging
(United Nations and Department of Economic and Social Affiars Population
Division, 2017), older persons aged 60years or older numbered 962 million
in 2017. This number is expected to double again by 2050. As the average