18-Year-Old High School Football Player Collapses

Josh Nava, who played for the Justin Grayson Riverside Unified School District in California, is in a coma but breathing on his own.
1:39 | 10/28/15

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Transcript for 18-Year-Old High School Football Player Collapses
And next here tonight, to a stunning image of a young high school football player collapsing on the side of the field. At first, the teen stumbling off the field, and then collapsing, rushed immediately into surgery. This incident, of course, the latest in a dangerous season already. Seven young players losing their lives in just seven weeks. And tonight, there are new questions about the helmet this player was wearing, with a sensor designed to give warning. And the question -- why didn't it pick up this particular hit? Here's ABC's Matt Gutman. Reporter: Number 18 josh Nava makes the tackle. He's down and he looks like he's in pain. Reporter: But he barely makes it back to the sideline Friday night, wobbling until a teammate props him up. Then collapsing under that bench. Came off the field, everything seemed Normal. Reporter: This ambulance rushing the 17-year-old defensive back to a hospital in Riverside, California, for emergency surgery to stop the bleeding and swelling on his brain. Like his teammates that night, Nava was wearing Riddell's insight impact helmet rimmed with sensors. That censor is in there to monitor this severity of certain impacts and also the frequency of certain impact, as well. Reporter: But in Nava's case, the school district says his helmet's sensor did not go off. Recent studies show that the helmets produced in the $125 million dollar a year industry do not reduce the risk of concussions. Sensors like this are not going to stop the concussion epidemic but if a coach sees a red light like this blinking at least he knows to take a second look at a player. Tonight, Nava is still in an induced coma, but at least now his family says he's breathing on his own. Matt Gutman, ABC news, los Angeles.

This transcript has been automatically generated and may not be 100% accurate.

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