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, résilient 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 ) and the proximal end (13p) of the band (2) together into a slipknot, in particular around the segment of the digestive tract to be contracted. Said gastric band (1) is characterized in that the hollow band (2) has, when in the inoperative position and when the tube (5) and the band (2) are not inserted into each other so as to form the ring (12), a preformed curved portion (14) which is extended, by a substantially rectilinear portion (15), from the proximal end area (13) thereof to the free distal end (9 ) of the band (2), said substantially rectilinear portion (15) being suitable for facilitating the insertion of the proximal end (7P) of the tube (5) through the loop(s) ( 11) of the band (2), and in that the hollow band (2) has, on the outer wall thereof (18), two loops ( 11 , 112), said loops being arranged on the substantially rectilinear portion (15) of the hollow band (2).
