A device for restraining the head of an injured person carried on a cervical support board, the device having a pair of L-shaped side frames each defining a base portion and a brace portion. The brace portion is sized approximately 6-8 inches long (in the direction of the base portion) and 4-6 inches...http://www.google.de/patents/US4571757?utm_source=gb-gplus-sharePatent US4571757 - Head restraining device for cervical support brace
