The gastroplasty procedure consists in putting a silicon ring, whose gauge can easily be modified, around the higher part of the stomach.

The stomach is a pouch located between the oesophagus and the small intestine from approximately 1 liter. Gastroplasty will separate your stomach in two pouches (see diagram): A higher pouch from 15 to 25 Cm3 (3 to 4 spoons) and a lower pouch.

Your stomach is transformed in a sand glass, the food will pass slowly through the gastric ring.

When you swallow a small quantity of food, chewed well, it will go down in the higher pouch, located over of the gastric band.

This pouch will dilate, which will stimulate the center of satiety located at the level of the brain.

After having introduced a small quantity of food, you will not be any more hungry.
 
 
The gastric band can be tightened or loosened thanks to a small case located under the skin (in general on the level of the abdomen, a few cm under the left coasts). This case is connected to the gastric band by a small pipe.

After a local anaesthesia of the skin by patch, some cc of liquid can be injected into the case, which will inflate the gastric band and will decrease its gauge, the food will pass then more slowly.

The gastroplasty acts by restrictive effect : it decreases the volume of the stomach and it slows down the passage of food.

The gastroplasty gives no modification of the digestion of food. 
 
The principal interest of the gastroplasty is to restore the sentation of satiety, which was decreased because of all the modes that you made.  

 Gastroplasty and satiety