Humidity-Insensitive Tissue Oxygen Tension Sensing for Wearable Devices^†

Area of Science:

• Biomedical Engineering
• Materials Science
• Sensor Technology

Background:

• Tissue oxygen partial pressure (pO₂) quantification is vital for diagnosing conditions like burns and diabetic ulcers.
• Transcutaneous oxygen monitors (TCOMs) are increasingly used in healthcare and sports, but environmental humidity affects their reliability.

Purpose of the Study:

• To develop a novel oxygen-sensing material for TCOMs that is insensitive to humidity.
• To overcome the limitations of existing oxygen-sensing materials that are affected by environmental moisture.

Main Methods:

• Incorporation of an oxygen-sensing metalloporphyrin into various host matrix materials.
• Development of a tetraethyl orthosilicate (TEOS)-based polymer film as the host matrix.
• Evaluation of the oxygen-sensing film's response to oxygenation under varying humidity levels.

Main Results:

• A highly breathable, oxygen-sensing metalloporphyrin polymer film based on TEOS was successfully developed.
• The developed film demonstrated reliable oxygen partial pressure (pO₂) measurements that were independent of humidity fluctuations.

Conclusions:

• The novel TEOS-based metalloporphyrin polymer film offers a promising solution for humidity-independent TCOMs.
• This advancement could lead to more reliable and widespread use of TCOMs in clinical and personal monitoring applications.