Furthermore, they say, it is known that these negative effects are related both to the duration of exposure and to the concentration of the gas itself. For example, some health regulations recommend a [safe] maximum value of 0.5 percent CO2 in the workplace, or that a 30-minute exposure to 4 percent CO2 is considered very harmful to health.
The intelligent FFP2 mask designed at Granada allows real-time determination of re-inhaled carbon dioxide using a mobile phone. This method represents a significant advance as a wearable system characterized by its low cost, scalability, reliability and comfort for monitoring magnitudes of interest for health.
The development has been achieved by the multidisciplinary research team ECsens between the departments of Analytical Chemistry and Electronics and Computer Technology of the UGR, which have together developed a real-time, battery-free, portable detection system for the measurement of gaseous CO2 in said internal volume of the mask. The work is described in Nature Communications.
Although standard masks simply act as air filters for the nasal and/or oral passages, the integration of sensors to measure parameters of interest is considered an added value to improve their use and effectiveness, creating a new paradigm of smart masks.
"The system that we propose consists of the inclusion, inside a standard FFP2 mask, of a flexible label made up of a novel optochemical CO2 sensor of our own development together with all the signal processing electronics. Both have been printed on a light and flexible polymeric substrate, forming what is called a 'sensor label', without causing any discomfort for the user," said the authors.
The manufactured tag does not use batteries, because it is wirelessly powered by the NFC communication link of a smart phone through an Android application. This app is also used for data processing, alert management, and display and sharing of results.
UGR scientists have carried out preliminary tests of this smart mask with subjects, both with sedentary activity and during physical exercise. "Our results, which are in line with previous clinical trials, provide CO2 values between 2 percent during sedentary activities up to maximum values of almost 5 percent during high-intensity physical exercise," said the authors.
"These values are significantly higher than the range of 0.04 percent – 0.1 percent of CO2 found in open atmosphere or typical work environments considered healthy. Although the tests carried out do not constitute a formal clinical trial, their purpose is to give an idea of the potential of the system developed in the field of wearable sensors for non-invasive health monitoring."
COMPAMED-tradefair.com; Source: University of Granada
