Abstract: A concussion detection and communication system is described. In some examples a concussion data module may be worn by one or more subjects. Each concussion data module may include multiple accelerometers and may communicate data signals wirelessly to a base unit. Upon determining that the base unit is not within effective communication range, a concussion data module may relay signals to the base unit through another concussion data module.

Abstract: A concussion detection and communication system is described. In some examples a concussion data module may be worn by one or more subjects. Each concussion data module may include multiple accelerometers and may communicate data signals wirelessly to a base unit. Upon determining that the base unit is not within effective communication range, a concussion data module may relay signals to the base unit through another concussion data module.

Abstract: Embodiments provide protective helmets configured to protect the head from linear and rotational acceleration in an impact. In various embodiments, the helmets may include an outer layer, an inner layer, and at least one intermediate layer coupled to the outer and inner layers by alternate fixation sites, thereby providing a suspension between the outer and inner layers. In various embodiments, the intermediate layer may be made from a honeycomb material, such as an aluminum honeycomb. In use, in-plane deformation of the honeycomb may allow for translation of the outer layer in a substantially tangential direction relative to the inner layer, thereby mitigating rotational acceleration imparted by the tangential impact component.