Can someone try the Orbera balloon if they've previously had a gastric bypass?

You cannot have the Orbera balloon after gastric bypass. After the bypass surgery, there is a very small stomach pouch conected to your esophagus (food pipe) and thus cannot accomodate the balloon. Also, the gastric bypass should have produced better results than those expected from the balloon. If the gastric bypass outcome was not as expected, it usually indicates a dietary problem. If there is reason to suspect a complication from the surgery, such as a fistula (hole) towards the bypassed stomach, you should then seek medical evaluation. If not, then you should consult a dietician/nutritionist and engage in an exercise program if possible

No you can not have the Orbera or reshape gastric balloon after gastric bypass or after any previous gastric surgery. Band over bypass is a great option as revision to gastric bypass.