Design and In Vitro Interference Test of Microwave Noninvasive Blood Glucose Monitoring Sensor

Area of Science:

• Biomedical Engineering
• Microwave Sensing Technology
• Diabetes Monitoring

Background:

• Continuous glucose monitoring (CGM) is crucial for diabetes management.
• Existing methods often require invasive procedures or have limitations in accuracy and calibration.
• Noninvasive monitoring offers a promising alternative for improved patient compliance and quality of life.

Purpose of the Study:

• To design and evaluate a novel microwave noninvasive continuous blood glucose monitoring sensor.
• To assess the sensor's performance against commercial devices during an oral glucose tolerance test.
• To investigate the sensor's susceptibility to common endogenous interferents.

Main Methods:

• Development of a microwave sensor utilizing two spatially separated split-ring resonators.
• One resonator interacts with glucose levels, while a reference resonator allows for temperature calibration.
• Interference testing using a Franz cell assembly with common sugars, ascorbic acid, and uric acid.

Main Results:

• The proposed sensor exhibited performance comparable to commercial blood glucose monitors and CGMs.
• Temperature variations were effectively calibrated out using the reference resonator.
• Interference tests confirmed that sensor response was primarily driven by glucose concentration, with negligible effects from other substances.

Conclusions:

• The developed microwave sensor shows significant potential for accurate, noninvasive continuous blood glucose monitoring.
• The dual-resonator design effectively addresses temperature fluctuations and minimizes interference.
• This technology could offer a more convenient and patient-friendly approach to diabetes management.