This is my first time on here so I don't know if this is being placed the right way or not... I have a question, I take care of a man with esophageal cancer and he has a trach. We have an emergency obturator by the bed, just in case. I thought an abturator was to block the airway and I don't understand why I would ever need that. They say for when the outer cannula comes out, but how does this work? I don't get it. thanks