Vehicule-occupant protection device, seat and vehicle, associated seat and vehicle

The device (10) has an inflation unit (12) connected to an airbag (11) via a feed pipe (13) for feeding inflation fluid to inflate the airbag under predetermined conditions. A fluid expulsion unit (20) e.g. solenoid valve, is co-operated with a detection unit (15) for detecting a predetermined event to remove the fluid resulting from inflation of the airbag when the event occurs to inflation of the airbag. The airbag is provided with a peripheral elastic strap for optimizing the deflation of the airbag when the expulsion unit allows the fluid to be removed from the airbag. The event is a water presence event, a fire presence event, and a seat belt opening event subsequent to inflation of the airbag. An independent claim is also included for a vehicle seat comprising a bottom zone and a back zone.