Helmet to minimize directional and localized forces in the brain and other body parts by means of shape preservation

A method for protecting the human head during and after an impact. This is accomplished by fabricating a layer of material that fits precisely on each individual wearer's head, and yet is so rigid that upon impact, the head will not be allowed to significantly change shape or volume, even temporarily. The structure and properties of this protective layer can be easily adapted to most helmet designs. The preferred method of forming this protective layer is to map each wearer's head shape with laser scanning, and then form the layer by means of 3D printing. Said fitted and rigid layer in very close and uniform contact with each wearers head is called an SPDI shield. The SPDI label stands for “Shape Preservation During Impact”.