The most promising current concussion-prevention research comes from a study of ... woodpeckers (according to a December Business Week report). 

Scientists hypothesize that the birds’ apparent immunity from the dangers of constant head-slamming is because their neck veins naturally compress, forcing more blood into their craniums, thus limiting the dangerous “jiggle room” in which brains bang against the skull. A team led by a real-life doctor portrayed in the movie “Concussion” is working on a neck collar to slightly pinch the human jugular vein to create a similar effect.