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Figure 1 (A) General view of the FloWatch implant. The piston has a stroke of 3 mm for tightening or loosening of the banding. The silicone membrane is flexible and extensible, protecting the piston and the inside of the case from body fluids while allowing the piston to perform its adjustment movements. The measurements of the FloWatch when clipped are 26 x 18.4 x 17 mm (length x width x height). (B) View of the implant in its two extreme positions: the adjustable surface where the pulmonary artery is confined varies with the displacement of the piston. The 3-mm piston stroke causes a variation of the adjustable surface between 72 mm² and 38 mm² with great precision. (C) View of the external control unit and its external antenna, which should be placed on the patient's thorax just above the implant.