A gastroplasty ring having a single control is provided and includes a flexible
strip with two ends for being closed around the stomach by a closure system so
as to reduce the diameter of the opening of the stoma. The strip may have an annular
compression chamber of adjustable volume and of substantially constant section
connected by an adjustment catheter to a device for adjusting the internal pressure
in the chamber so as to adjust its diametral expansion. The closure system may
be used for reversibly locking and loosening the ring, and for releasing the diameter
of the ring momentarily by relative displacement between the two ends, while continuously
forming a closed loop around the stomach. The ring constitutes a gastric implant
for treating obesity.
