Cryo-charge

A cryo-charge was a device that lowered body temperature to absolute zero in about half a second, freezing the user on the spot. It was used to transport patients to other planets where there were better hospital facilities.

Stella jokingly offered one to Scrum after he injured himself in a bandit trap, but didn't follow through as they were for "emergencies" only. (PROSE: Prisoner of the Daleks)