I was invited to post here by Nykoal.

Recently I underwent a tubal cannulation procedure to clear my blocked fallopian tube. Here's what happened:
In November I was diagnosed by HSG (hysterosalpingogram) to have a blockage in one fallopian tube. An HSG is when they inject a radiopaque dye through a catheter through your cervix into your uterus that can be seen by a special X-ray. After the dye fills the uterus, it spills into the fallopian tubes. They follow the path of the dye to see if there are any abnormalities in your reproductive tract.
But the doctor explained the HSG is a somewhat limited test, because if one tube is slightly wider than the other, the fluid they inject under pressure will just go the path of least resistance, in other words up the bigger tube. So they can't always tell if you're actually blocked, and sometimes need to perform a more specialized test - the tubal cannulation.
A tubal cannulation is a more specialzed form of the HSG. They again inject a radiopaque dye, but this time the catheter is run only into the one fallopian tube and is sealed off by a balloon. So the dye only enters that one tube. Then they can tell not only if the tube is actually blocked, they may be able to remove the blockage, depending on the type of blockage. I'm not exactly sure how they remove it, since I'm sketchy on that part of the procedure.

I've heard it was a technique borrowed from angioplasty.
For the tubal cannulation, I was given "conscious sedation", which meant I didn't lose consciousness, but my memory is a little fuzzy on the details. I do know the tech said "there definitely is a blockage," and I was very sad, but about 30 seconds later he said "I cleared it!" I guess it was an easy fix. Best of all, I didn't feel a thing! That was a big plus, since the HSG was a killer. You take an antibiotic before and after the procedure to ward off any chance of infection being introduced into your reproductive tract.
Now that both tubes are clear, we begin IUI next week!