All I can add is that certain surgeons place the equivalent of an NG tube directly through a hole in the upper abdomen during surgery (for post-op comfort for the patient)...I had mine when they created my k pouch and it was not removed until I was discharged 31 days later.
That was the only surgeon that I have ever had who did it that way (although I have heard that Dr R at Palms who does the BCIR does that too)...But that is during pouch creation surgery.
For the ileus or blockage it is 'up the nose' they go...and turn the Hoover on high speed...feels and sounds like there is a mighty compressor going off in your head.
I had it for 7 days post-op for a pouch revision. I cursed the surgeon for the whole time...but I did not get an ileus!