Concussions are becoming an increasingly large area of concern for professional athletes in a number of sporting disciplines. It's one of the reasons that Prevent Biometrics is putting its Head Impact Monitor System on sale. HIMS is a smart mouthguard that offers empirical evidence if a player has received a head injury. Rather than using a series of observational tests, which can prove ineffective, the system operates in real time. That way, as soon as a collision is detected, players can be hooked for medical treatment.