The scoop stretcher (or clamshell, Robertson Orthopedic Stretcher, or just scoop) is a device used specifically for casualty lifting. It is a tubular structure that can be split vertically into two parts; blades are fixed to the tubes. The two halves are put on each side of the casualty, and then clipped together; the blades go under the casualty and replace the hands of the first responders (as they are thinner, this less likely to worsen an instable trauma). 
Top: putting the scoop stretcher; middle: casualty lifting with five team members (one is pushing the normal stretcher); bottom: view from below) The scoop stretcher can be operated with only two team members: one is carrying the head side, the other one the feet side. The scoop stretcher can be used for patient transport, provided the patient is strapped. But for comfort reasons, it is recommended to put the patient on a vacuum mattress instead, or at least on a long spine board: the scoop stretcher is put on the transport device and then opened. The scoop stretcher is part of the origin of the term "scoop and screw, or stay and play". "Scoop and screw" suggests a scenario in which prompt transport to a hospital is demanded, while a situation in which there is time to provide care on scene may be considered a "stay and play." scenario.
