a person or thing that resuscitates; esp., an apparatus for giving artificial respiration by forcing air or oxygen into the lungs
See resuscitator in American Heritage Dictionary 4
(rĭ-sŭsˈĭ-tāˌtər)
noun
One that resuscitates, as an apparatus that forces oxygen or a mixture of oxygen and carbon dioxide into the lungs of a person who has undergone partial asphyxiation.