Adjustable gastric banding (also called laparoscopic gastric banding, or lap band surgery), is the least invasive weight loss surgery. In gastric banding, a surgeon puts a silicone ring around your upper stomach.
The surgeon can adjust the ring's tightness by injecting saline through the skin to fill up the band or taking out saline to loosen it. This fine-tunes the exact size of the stomach.
If necessary, the procedure can often be reversed. Gastric banding is also less likely to cause nutritional problems, but it usually results in less weight loss than gastric bypass surgery.