https://www.penncare.net/shop/search.aspx?SearchTerm=hartwell View a short video on how EMS personnel use the Evac U Splint (vacuum splint technology) pediatric mattress. A simple, uncomplicated vacuum splint design enables fast, accurate application of the device. Conforming beads make positioning of the patient in neutral alignment a quick on-scene procedure. Child is held securely and comfortably without unnecessary pressure, thus reducing child anxiety during transport. Filled with thousands of polystyrene beads, the vacuum mattress acts as a thermal insulator helping to maintain the child's core body temperature.