This is a fascinating item, reported on bbc.co.uk by Fergus Walsh, where the use of a motion sensor, similar to the type of thing used in the Wii and other game controllers, is linked to a pain blocking implant.
The sensor can tell when a person is standing, sitting, lying etc. and adjusts the implant accordingly for maximum effect relating to the position of that person.
It’s not as complicated as I seem to have made it sound and it’s well explained in the short video on one particular case study which you can find here.
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