Andrina it’s a flexible tube just like what they scope you with, it doesn’t straighten. It goes in through your nostril down your throat, in my case forcefully. As far down as needed. It resolves the blockage totally. It’s hooked up to a huge vacuum cleaner and they suck it out. When I had my ileus there was damn near 2 gallons or more of green bile in the receptacle into which it’s sucked. You have no idea how much gastric juices your body produces until you are hooked up to one of those suckers for 24 hours. It will blow your mind away, how much gets produced, backed up and sucked out. We produce more gastric juices than cows do milk. It will blow you away. And all that stuff can’t go down if blocked, so it’s gonna come up whether it’s vomited up or sucked up, and you don’t want the former. I was actually vomiting when I had the NG tube put down, and it’s not what you want after surgery. The bile backup causes the worst nausea ever!