A board has an upper section, with an upper surface for supporting a patient, and a lower section, having two spars separated by a concave surface. The lower section is smaller than the upper section, forming longitudinal flanges through which hand passages are provided. Stiffening members can be housed...http://www.google.sh/patents/US20040187214?utm_source=gb-gplus-sharePatent US20040187214 - Patient immobilization and transportation system
