The FREO2 Siphon is an electricity-free oxygen concentrator designed for settings that often experience power outages. It is designed to be durable and uses water to concentrate the oxygen.
Distributors / Implementing Organizations
Intellectural Property Type
User Provision Model
The FREO2 Siphon is currently in clinical trials and is not yet available for purchase.
Distributions to Date Status
FREO2 uses a “molecular sieve” to remove nitrogen and leaves mostly oxygen. FREO2 passes a small amount of flowing water through a siphon to produce a vacuum and mechanically converts part of this to compressed air. The vacuum and the compressed air power a vacuum pressure swing absorption system to concentrate oxygen.
The product is currently in clinical field trials. Support for these is provided by the manufacturer.
This product is a prototype, replacement parts are not yet available.
Manufacturer Specified Performance Parameters
Vetted Performance Status
Complementary Technical Systems
Academic Research and References
Sobott B.A., Peake, D.J., Black, J.F., Rassool, R.P., 2015, FREO2: An Electricity Free Oxygen Concentrator, Pneumonia, pp. 6-115.
Compliance with regulations