An implantable device in the form of a small belt or strip intended to be surgically (open surgery or laparoscopically) placed around the proximal part of the stomach to create a small pouch with a narrowed outlet (stoma) that divides the stomach into two portions. Commonly known as a lap-band, it is used for weight loss in overweight/obese patients by attempting to restrict the quantity of food consumed by increasing the sense of satiety (fullness). The device typically has an inflatable band used to control the amount of constriction on the stomach; this is adjusted by percutaneous injection of, e.g., saline, into a subcutaneous access port connected by a tube to the device.