An apparatus (10) for helping to protect a vehicle occupant (52) includes an inflatable device (20). The apparatus (10) also includes a primary inflation fluid source (32) and a secondary inflation fluid source (34) that are actuatable independently of each other. The apparatus (10) includes means (60,...http://www.google.es/patents/US6581961?utm_source=gb-gplus-sharePatente US6581961 - Deactivation of second stage of air bag inflator
