having done a bit of research on this kind of thing, the condition is known a "erosion", and is a known potential complication from having adjustable gastric band surgery.
it is described on wikipedia as:-
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Erosion - The band may slowly migrate through the stomach wall. This will result in the band moving from the outside of the stomach to the inside. This may occur silently but can cause severe problems. Urgent treatment may be required if there is any internal leak of gastric contents or bleeding.
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so, as this is a known (but rare) side effect of the proceedure, is there still a chance there is a claim, as it has taken the doctors over 3 years to diagnose the problem, despite repeated visits to the doctors complaining of pain?.