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"Worth more than the paper it's written on"

Science Translational Medicine

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How accurate can it be?

In order to keep advancing our understanding and capabilities at Spyras, we continually test ourselves against the best.

We were fortunate to be able to conduct a usability test against a ventilator in which used our sensor technology in masks against flow sensors in order to track the accuracy of the Spyras system.

Across multiple varying breathing rate per minutes at different times, Spyras was able to achieve a 99.6% breathing rate per minute accuracy against the ventilator.

just a piece of paper...

The paper sensor is an advancement in breath based sensing.


Exploiting a natural substance that is in abundance, such as paper, creates an affordable, disposable and accessible sensing solution.

Paper adsorbs water.

adsorb [verb]

To cause a substance, usually gas, to form a very thin layer on the surface of another substance.

As water is deposited onto the paper from breathing, a thin film of water builds on the surface of the cellulose fibers, which causes the conductivity between the carbon electrodes to increase.


When you breathe in, water is removed from the film layer and causes the conductivity to decrease.

This cyclic change gives the ability to watch breathing pattern in near real time.

If you would like to read the published paper then click the PDF to download.

Paper based sensor to help identify seps

Want more science?

Take a look at the current focus of the work being done inside the Güder Research Group at Imperial College London.