It is possible to place a Lap Band on the dilated pouch that we see after gastric bypass. It is a little more challenging than the usual Lap Band so you should choose a surgeon and program that have extensive experience with the procedure.
Yes, a lap band over a bypass can be done. Many patients of mine have done the lap band over the bypass.They have been doing great since then. The process is the same as the lap band. Not many risks because the process is the same as lap band.