Mechanical-waves Dispersing Protective Headgear Apparatus

A mechanical-waves dispersing protective headgear apparatus, comprising:

• a pressurizable and ventable outer balloon shell enclosing a plurality of inner layers, and an inner hard shell;
• the pressurizable and ventable outer balloon shell, provided as an airtight shell reversibly pressurizable by a gas, which is configured to be reversibly and depressibly deformable by an impact of a blunt trauma at an angle to a planar surface of said pressurizable and ventable outer balloon shell, which is configured to release the gas upon said impact of said blunt trauma, which comprises a dome configured in a substantially hemispherical bowl shape conforming to a human head and a ballooned rim adjoining a circumferential margin of the dome, which provides a pressurizable space that encloses a plurality of the inner layers concentrically stacked up, which has a pressurized-gas intake valve and a plurality of pressure-triggerable gas release valves on a lower surface of a circumference of the ballooned rim, which has a pressure sensor device disposed on an outer surface of the ballooned rim having an alarm function for a gas pressure above or below an expected range of the gas pressure inside said pressurizable and ventable outer balloon shell and which slidably encases the inner hard shell;
• and
• the inner hard shell, provided in a single-piece dome configuration, which comprises at least three tight-bonded layers with an outer layer and an inner layer made of an impact resistant polymer and a mid layer made of a plurality of non-polymeric porous materials, which is undeformable upon the impact of the blunt trauma, which covers an area of the human head, which is configured to prevent fracture of a skull upon the impact of the blunt trauma to the skull and which is configured to reduce transmission of mechanical waves of the impact across said inner hard shell.