Stasis Casket
From Warhammer 40k - Lexicanum
A Stasis Casket (also known as a Stasis Cabinet[2]) is an Imperial device that, when activated, places a Stasis Field upon the person or object within it.[1][2]
Mortally wounded Imperials can be placed within a Casket to stop them from dying and in the hopes that they can later be saved with medical care.[1]