An infusion control device controls infusion of a liquid in an extracorporeal blood circuit having an arterial pipe connected to an inlet of a blood compartment of a filter and a venous pipe connected to an outlet of the blood compartment. The top includes a frame and a fabric cover designed to cover and move with the frame. The polypropylene substrate is for instance polypropylene homopolymer or thermoplastic polyolefin. When a lamella is pulled, the lamellae are pivoted in a common plane by the pivoting element. The information is reported to and received at the telecommunications infrastructure. The elevation difference between the depth of the indentation and the ridge is selected to expose a barrel pin of the handgun.