All the branches of the left vagal nerve to the oesophagus and stomach are sectioned, slowing gastric evacuation.
In addition, this lower valve stimulates the IGLE satiety centres in the basal state in the wall of the abdominal oesophagus.
This procedure must be associated with multidisciplinary medical-surgical, nutritional, psychiatric-psychanalytical treatment, two to four visits in the first year, with the accent firmly on the psychological factors (psychotherapy support often indicated) and a resumption of sport.
The method can also be adjustable. The band is inflated and/or deflated by the surgeon in radiology, who can judge how the band is working, the weight loss according to tightness, the adaptation and acceptance of the band by the patient and thus whether the band is working.