Capnography Set to Take to the Field

First responders to a medical emergency immediately check the patient's airways to see if there's any action. Of additional interest would be a determination of the level of exhaled CO2, a reliable indicator of pulmonary function. Respiratory CO2 measurement, or capnography, is typically accomplished by nondispersive IR (NDIR) or colorimetric devices. But they are not built for field use. Now there's a third technique.

Nanomix has developed a CO2-specific monitor that combines carbon nanotube transistors with silicon microstructures to yield a small, disposable unit. It is designed for use by EMTs at an accident scene to verify endotrachial tube placement and to assess the effects of CPR and other life-support measures. The monitor is useful as well for anesthesiologists in the OR, and in clinics that perform sleep apnea observations and evaluations of asthma treatments.

The unit takes advantage of the previously developed Sensation detection platform. The carbon nanotube network overlying the silicon microstructures is coated with a polyethylene imine and starch polymer layer that interacts with the chemical or biological analyte of interest. The resulting electrical impedance can be measured by applying a voltage to produce a characteristic signal. The monitor's operating lifetime is 6 hr., but in actual use it could last up to a week. The estimated shelf life is a year. The dynamic range is 0%–10% CO2, and response time is <1 s.

Industry Event

Sensors Expo & Conference

Register now and save with Early Bird Rates – Limited Passes Available!

North America’s can’t-miss event dedicated to sensors, connectivity, and IoT will take place this June 22-24 in San Jose, CA. Attendees can make connections, collaborate with experts & peers, get insight into emerging technology & trends, and find new approaches to evergreen challenges. Use promo code FE100 for $100 off Conference Passes.

Nanomix has received a $500,000 NSF Phase II SBIR grant to devise a collaborative development kit based on the Sensation platform. The company will work with academic and industrial partners on applications ranging from medical diagnostics to water and air quality monitoring.

Contact David Macdonald, Nanomix, Inc., Emeryville, CA; 510-428-5300, [email protected],

Suggested Articles

VLSI also says chip shipments are down 20% over eight-week period

Large tech conferences including CES have set event dates for early 2021, about the time vaccines will emerge

Aside from good internet access, work-from-home amid COVID-19 sometimes boils down to celebrating our humanity.