Blood-gas infuser

An unconscious Neelix with a blood-gas infuser on the side of his head

A blood-gas infuser was a medical device used to supply a body with oxygen. It could not, however, replace the function of the lungs on a long-term basis.

In 2371, The Doctor used a blood-gas infuser when Neelix's lungs were removed by a Vidiian. (VOY: "Phage")

Blood-gas infuser concept art

Concept artwork of the blood-gas infuser, illustrated by Sternbach

This medical instrument was designed by Rick Sternbach. (The Official Star Trek: Voyager Magazine issue 1, p. 72)