The present disclosure refers to a system to control mechanical lung ventilation with volume band, more particularly a system to manage respiratory cycles in patients. The PLL receives an input clock signal and provides an output clock at a frequency that is the frequency of the input clock multiplied by a clock multiplier. The deformation or bending of an angular zone makes it possible to produce the puncture point and the exit orifice in one stage. The intakes and restrictor are sized and positioned such that the ratio between: the conductance of the path from the inlet to the greater demand sensor to the conductance of the path between the sensors effectively isolates the lesser demand sensor from the effects of the greater demand sensor.