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Emergency immobilizers consisting of a rigid collar designed for maximum restriction of movements and/or total immobilization of the head and the cervical vertebrae. These devices usually consist of rigid collars made of light metallic or hard plastic radiolucent materials. The immobilizer permits quick placement around the neck and a hole for easy access to the trachea. Rigid-collar cervical spine emergency immobilizers restrict head, neck, and cervical spine anterior-posterior motion to a great degree. The collar frequently permits its attachment to a whole-body board immobilizer or to a stretcher, providing additional restriction of the body movement. Extrication collars are mainly used after traumatic vehicle accident injuries to facilitate safer and easier transportation and/or diagnosis, and ease of access to radiographic procedures.
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