Mini-Sensor Suspension System for Supine CO2 Monitoring

Case ID:

A multi-CO2-mini-sensor-based monitoring system has been developed to measure the CO2 concentration of human respiratory gas around a subject’s face while the subject is in the supine position. According to the collected data, the system supports further analysis of human physical conditions such as sleep stage and quality.

The mini-CO2 sensor samples concentrations in a range of 0 to 50,000 ppm with 1 reading per second and ±70 ppm accuracy. A three-dimensional CO2 bubble is visualized with a continuous estimation of CO2 concentration inside the bubble based on real-time data.

The mini-sensor suspension system simultaneously solves the problem of invasive monitoring while offering a range of diagnostics that are simply unavailable in most current methods. It is applicable to triage systems, sleep studies, surgeries, and emergency/non-emergency patient monitoring.

Current non-invasive measurements of the COconcentration in human respiratory gas mainly rely on respiratory masks or transcutaneous measurement. These cannot detect the natural CO2 accumulation of both respiration and the gas distribution in a room environment. Other methods, such as wall-mounted environment CO2 sensors, are limited by distance and do not provide a three-dimensional CO2 distribution around the subject’s face.


  • Three-dimensional CO2 mapping
  • Emergency and non-emergency monitoring
  • Sleep stage and quality analysis


  • Non-invasive
  • Repositionable
  • Multifunctional
Patent Information:
Contact For More Information:
Katherine Kuhns
Licensing Manager, UAHS-TLA
The University of Arizona
Lead Inventor(s):
Yijie Chen
Md Tariqul Islam
Young-Jun Son
Esther Sternberg