In a Gastric Bypass, the stomach is cut into two sections: a smaller upper "pouch" and larger lower “remnant”. The small intestine is cut in two and the lower intestine is attached to the pouch with stapler/sutures, the upper intestine is stapled/sewn to the lower intestine. Patients typically stay in the hospital for 2 nights or more.
In a Sleeve, a tube is passed through the stomach along the inside curve. The tube is used to map out the tube or “sleeve” of stomach that will remain. The rest of the stomach is cut off and thrown away. Patients typically stay in an aftercare suite or hospital for 1-2 nights.
A silicone ring-shaped balloon is placed around the upper stomach through a tunnel created behind the stomach. The stomach is sutured around the band. Tightening or loosening the fit of the band involves puncturing a port beneath the skin with a needle every few weeks or months.