The invention relates to an inflatable, adjustable gastric band (1) to be easily positioned around a segment of the digestive tract in order to contract the latter, said band including: a flexible, hollow, resilient band (2) and a flexible inflation tube (5) connected to the band (2), the tube (5) and the band (2) being provided, in the respective distal end areas (6) and (9) thereof, with complementary closing means [notches (10) and loops (11)] that are capable of mutually engaging so as to lock a ring (12) in a closed position, said ring being formed by bringing the distal end (9
