Somewhat-Reticent Dunno. Maybe prevention is the only thing that can be done. No combustibles and no spark sources in the tube. You want in? Best be naked, and you are going to lie on bare metal or glass Still danger from static electricity? Make it more humid? Need to communicate with patient? That's tougher with a kid, but lip reading and sign language?
A quick search for "fastest fire suppression" yielded...
https://firefly.se/technology/quick-suppression-system/
Says it is low pressure, though. So the high pressure in the chamber would have to be eliminated before it could work. Something with a big enough orifice to equalize the pressure then replace the purge oxygen. Tough problem to solve.