http://www.faqs.org/patents/app/20080246264
2. In-expensive head and upper torso restraint having a head-liner mounted air bag comprising:vehicular seat backs and head rests mechanically arranged to follow the forward motion of a human head and upper torso, but preventing the snap-back of said head and torso in a vehicular frontal or sideways collision, seat belts attached and anchored in said seat backs,a U-shaped air bag contained in a cavity in the head liner of said vehicle,said seat belts and said airbag mounted around each said seat back,and pyro-technic cartridges rapidly actuating said air bag when said collisions occur.

http://investing.businessweek.com/research/stocks/snapshot/s...
Pyrotechnic Cartridges/Initiators The company designs, markets, and manufactures pyrotechnic power cartridges/initiators and explosive detonators. These power cartridges are hermetically sealed electro-explosive devices.

ili pyro-cartridge:

http://www.ejection-history.org.uk/project/year_pages/2004.h...
During a simulated ejection exercise, a pilot occupying the rear ejection seat suffered burn injuries on his face and an engineer from Hindustan Aeronautics Ltd sustained injuries, when an ejection seat from an aircraft accidentally fired. A pyro-cartridge had not been removed before the test. The ejection exercise was conducted inside the . The seat shot up over the aircraft and penetrated and landed on the hanger roof.

http://pgsql.ru:8004/db/dict/index.html?q=pyro-
pyrocartridge
1> _spec. piropatron