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Last week, an unusual new treatment was approved in the US for rheumatoid arthritis . It consists of an inch-long device implanted into the neck that works by electrically stimulating a major nerve.

It is recharged once a week by the user placing a collar around their neck for a few minutes.

While it may be a few years before the treatment, called SetPoint System, becomes available in the UK, doctors here are interested because it works in a different way to other kinds of arthritis treatments.

The device offers a way to turn down overactivity of th

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