The anti-ligature cord I have seen works on the basis that as soon as too much force is applied, it breaks into pieces: http://www.hoyles.com/acatalog/anti-lig

The anti-ligature cord I have seen works on the basis that as soon as too much force is applied, it breaks into pieces: http://www.hoyles.com/acatalog/anti-ligature-sanipull-pull-cords.html http://www.hoyles.com/acatalog/anti-ligature-sanipull-pull-c... (scroll down for the examples) Perhaps it would be possible to incorporate the USB charging wires inside that and still have it work?