Hi Lee,
So a couple of things to think about. First, let's assume your surgeon will have to make an incision in the same area that your barrier is located. An incision can heal under the barrier if it's not flooded with output, so no real issue there. You just have to make sure you don't have any leaks... or things can get ugly quickly. If it were me, I would call both the hospital's wound care nurse (or that department) and their ostomy nurse before the surgery and find out how they'll proceed to address your wound(s) post-surgery if the incision ends up partially under your barrier. Make sure they have a plan to address your wound post-surgery because it will be their problem, not the surgeon's.
Second, contact the manufacturer of your ostomy barriers and explain the situation. Tell them you're being asked to bring a number of barriers for your gallbladder surgery and they may have to be placed over a fresh incision. I'm pretty sure no ostomy supplies are sterilized, so have them tell you exactly what to do if their barrier needs to be placed over a wound. Is there something that should be put on the wound first... or what do they recommend? You may be able to find a physically smaller barrier that still fits your stoma but takes up less overall real estate. Regardless, if what they tell you doesn't jive with what the wound care and ostomy nurses have told you... you need to discuss with them again and come up with a new game plan... and a plan B. Same goes for if your barrier manufacturer flat out says do not place their barrier over an open wound... get on the horn and make sure both your wound care and ostomy nurse know that. There may be a sterile barrier made by someone for just such situations... but I don't know. But make sure you have a viable plan before you get operated on. I know... it's not your job to figure this out, but if you leave it up to them bad things might happen, and you'll have a date for an unspecified amount of time with the ICU.
Third... why didn't your docs know your gallbladder was going south when you were operated on previously? Gallbladders aren't fine one day and then totally screwed up the next. Your liver function results in your bloodwork should have shown elevated values, giving folks a heads-up things were not normal. And they require routine bloodwork be done before any operation, so I'm sure you had a workup done as pre-op for your relocation surgery. I'm a bit curious... why exactly do they say your gallbladder needs to be removed? Are you having the normal symptoms... fever, nausea, vomiting, indigestion, bloating, heartburn, gas, upper abdominal pain on your right side, yellowing of your eyes and skin (jaundice)?
;O)