Blood-gas infuser

A blood-gas infuser was a medical instrument used to supply a body with oxygen on a limited short term basis. The Doctor used a blood-gas infuser on Neelix after his lungs had been removed by a Vidiian in 2371. 

A misplaced infuser sparked a sharp exchange between Doctor Elizabeth Lense and her assistant CMO, Sarjenka, early in their association in 2377.