Inclusion Criteria:

• Patients between 18 and 70 years
• Sleeve gastrectomy as a primary bariatric procedure
• Body Mass Index (BMI) > 40 kg/m² or > 35 kg/m² associated with at least one comorbidity susceptible to improve after surgery (including arterial hypertension, obstructive sleep apnea syndrome and other severe respiratory disorders, severe metabolic disorders, particularly type 2 diabetes, incapacitating osteo-articular disorders, non alcoholic steatohepatitis)
• Decision for intervention after multidisciplinary discussion
• Written informed consent

Exclusion Criteria:

• Previous upper abdominal surgery (cholecystectomy excepted)
• ASA (American Society of Anesthesiologists) score > 3
• Ongoing pregnancy or breast feeding
• Esophagus pathology or disorder (esophageal varices, esophageal diverticula, esophageal tumors, esophageal strictures)
• Coagulation disorder
• Patient not covered by social security service and patient on AME
• Patient under legal guardianship and trusteeship
• Patient with known silicon allergy (calibration bougie contains medical silicon)
• More generally, all other contraindications to the use of esophageal bougie MID-TUBE that have been the subject of a scientific paper or have been identified by the practitioner or practitioners