Respirator
A respirator was a medical device and breathing apparatus that assisted a patient who was having trouble breathing during medical treatment or due to medical distress. 

While undergoing surgery to repair his self-inflicted wounds in 2266, Joe Tormolen was on a respirator. ()

In 2270 Leonard McCoy considered putting Spock on a respirator when the Vulcan was in the final stages of choriocytosis. ()

Medical equipment