motorized gastric band (1) or "AGM" of the type comprising: - at least one receiving antenna shipped; - a motor acting on the diameter of the ring activated by induction, from at least one antenna external station to the receiving antenna shipped; and - an on-board electronics (2) adapted to ensure optimal use of the energy received; said ring being characterized in that at least one antenna (3, 4) is attached to said gastric band and disoriented as greater than or equal to 20 ° angle, and this trigonometrically AGM positive angle facing the opposite end ring.
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