Impedance-based polymer microneedle patch sensor for continuous interstitial fluid glucose monitoring

Area of Science:

• Biomedical Engineering
• Sensor Technology
• Diabetes Research

Background:

• Effective blood glucose control is vital for preventing diabetes complications.
• Conventional glucometers offer limited, painful, point-in-time measurements.
• Current continuous glucose monitoring systems have accuracy, cost, and lifespan limitations.

Purpose of the Study:

• To develop a microneedle-based sensor patch for minimally invasive, painless, continuous glucose monitoring.
• To overcome the limitations of existing glucose monitoring technologies.

Main Methods:

• Fabrication of microneedle sensors using complementary metal-oxide semiconductor (CMOS) process.
• Immobilization of glucose oxidase onto microneedle sensors.
• In-vivo testing of microneedle penetration and sensor performance.
• Long-term stability testing for up to seven days.
• Correlation of sensor readings with commercial glucometers.

Main Results:

• Painless and minimally invasive skin penetration achieved with a 3x3 array of cylindrical microneedles (approx. 520 μm depth).
• Successful immobilization of glucose oxidase confirmed via phase angle analysis.
• Effective sensor operation demonstrated for up to seven days.
• High correlation between microneedle sensor measurements and commercial glucometers, indicating reliability and precision.

Conclusions:

• The developed microneedle sensor patch enables painless and minimally invasive continuous glucose monitoring.
• This technology offers a promising alternative for improved diabetes management and complication prevention.