Abstract: An automotive vehicle seat (3) with an airbag intended for restraining its occupant (9) in the event of a side impact, comprising a bag (15), including a plurality of cells (31, 33, 35, 37), sized so as to protect the pelvis, abdomen, thorax and head of the occupant, located in the backrest (5) of the seat (3) wrapped in a flexible case and provided with at least two fixing points (25, 27) to fix it to the backrest (5) of the seat (3), which is inflated with the gas provided by a gas generator (17), separated from the bag, through a diffusing tube (19).

Abstract: The invention relates to an airbag comprising an inflatable cushion (11) with the gas produced by a generator when a collisions occurs having a vent hole (13) made in the inflatable cushion (11) which is provided with a device (21) including a part (23) made of flexible material with at least one hole (25) fixed to the inside of the inflatable cushion (11) and incorporating means for allowing the separation thereof from the cushion (11) when the internal pressure in the cushion is lower than a predetermined limit (Pt) preventing it from closing the vent hole (13) and stop doing so when the internal pressure in the cushion (11) exceeds said predetermined limit (Pt) such that it completely or partially closes the vent hole (13) when it adheres to the cushion (11) due to the effect of the pressure.