A new study will assess whether a targeted cooling collar can improve patients' recovery from traumatic brain injuries. Cambridge University Hospitals NHS Foundation Trust, which runs Addenbrooke's Hospital, said it would be the "world's first in-human study" to measure the "pioneering medical device". Various methods of "brain cooling" - or induced hypothermia - can be used to limit swelling in the brain when someone suffers a stroke or head injury. However, if cooling affects the whole body