Reduced-oxygen breathing device

This device helps a person simulate high altitudes by letting them breathe air with reduced oxygen. It works by mixing ambient air with nitrogen on a breath-by-breath basis, precisely controlling the oxygen concentration. The claims specifically describe a system using a hollow loop for mixing, an ambient air inlet with a one-way valve, and an outlet connected to a delivery unit like an oxygen mask.

Why it matters: Microcontrollers and precision gas sensors are significantly cheaper and more powerful now, making breath-by-breath control more feasible and affordable than in 2002.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: SpecializedComputer control, gas mixing, sensors, valves, software

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