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Sorry to hear about the problems you are having.
A drawback of the AdVance sling is that, once implanted, it cannot be adjusted. Therefore the patient is completely dependent on the surgeon getting the tension correct first time.
My surgeon has just told me of a recent (2010) development in sling technology from Austria, the A.M.I. ATOMS system.
Instead of the mesh support, a small silicone "cushion" applies the requisite pressure. The cushon can be inflated/deflated at any time after surgery by inserting/withdrawing fluid via a small port that sits under the abdominal skin.
An explanation from the manufaturer is at http://www.ami.at/en/index.php4?m1id=2&m2id=69&m3id=228 and an animated film is at http://youtu.be/88SAcOkL-iA.
The only clinical results I have been able to find so far are at http://registration.akm.ch/einsicht.php?XNABSTRACT_id=121191&XNSPRACHE_id=1&XNKONGRESS_id=130&XNMASKEN_id=900. The sample size (7 patients) looks a bit too small to be anything other than an indication.
I'd been considering the AdVance sling, but I'll certainly be giving this alternative some serious thought.
BTW I once had a complete blockage of the urethra and it's an experience nobody ever forgets - those three hours were the longest year of my life!
As a result I sought out a Continence nurse and got her to teach me how to self-catheterize. It's surprisingly easy and painless to do.
Now I never travel without a catheter discreetly stowed in my toilet bag. I've never had to use it, but it's wonderfully comforting to know it's there if needed.