A clamp (10) positioned on the canal to be closed can be opened using a solenoid (2) attracting one of its branches (4), the energy necessary for its operation, transmitted through wires (75), being produced by an energy sensor (7) placed in the body and capable, on the one hand, of picking up a wave capable of transporting energy coming from the outside, and, on the other hand, converting it into useful energy. IMAGE
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