Center discharge hybrid inflator device

An inflator device for an inflatable restraint system. The inflator device (20) includes a tubular body (28) with a center discharge opening (42) disposed in a center portion of reduced diameter (40). First and second end closures (46,56) each join an initiator (48,58) to a respective opposing end (32,36) of the tubular body (28) to define a sealed chamber (26). First and second generant housings (70,90) are disposed within the sealed chamber (26), define generant chambers (82,102) containing a supply of generant material and include a plurality of openings providing fluid communication between the generant chambers (82,102) and the sealed chamber (26). Rupturable initiator seals (86,106) are disposed between the initiators (48,58) and a respective generant chamber (82,102). A supply of pressurized stored gas and the supply of generant material are disposed within the sealed chamber (26).