1. An oral-gastric probe (20), comprising a body (21), the distal part of which is intended, in particular, as part of the technology of bariatric surgery for longitudinal gastrectomy to orient the surgeon for resection of a part of the stomach and to determine the closing line after resection, characterized in that a cylinder (25) is installed on the indicated distal part, which in the pumped state has a shape essentially corresponding to the shape of the pyloric cavity (4) and allowing it to be placed in this pyloric cavity (4), while the end of the pumped the cylinder (25) is preferably in the abutment position in the pylorus (5), and the distal end of the probe body (20) is preferably in the abutment position in the pyloric cavity (4), while the portion of the probe body (21) located above the inflated balloon (25), is pressed against the wall of the small bend (6) of the stomach (1), which allows you to: - determine the positioning of the beginning of the resection-closing line at the level of the pyloric cavity (4), - determine the resection-closing line, - and calibrate the stored pyloric cavity (4) and the sleeve of the stomach. 2. A probe (20) according to claim 1, characterized in that the dimensions of the inflated balloon (25) in a direct cross section determine the volume of the pyloric cavity (4) that is saved after resection, while the dimensions of the body (21) in a direct cross section determine the volume of the stomach ( 1) maintained after resection. 3. The probe (20) according to claim 1, characterized in that the inflated balloon (25) has the general shape of a (truncated) cone, preferably an asymmetric and deformed truncated conical shape with a terminal diameter Dt, a diameter at the base Db and a diameter Dm of the middle part so that Dt <；Db≤Dm, with the end shifted relative1. Орально-гастрический зонд (20), содержащий корпус (21), дистальная часть которого предназначена, в частности, в рамках технологии бариатрической хирургии продольно
