Clinical performance of a continuous viscometric affinity sensor for glucose.

Area of Science:

• Biomedical Engineering
• Medical Devices
• Diabetes Technology

Background:

• Continuous glucose monitoring (CGM) is crucial for diabetes management.
• Existing CGM technologies have limitations in accuracy and invasiveness.
• Viscometric affinity sensing offers a novel approach to glucose measurement.

Purpose of the Study:

• To evaluate the performance of a novel viscometric affinity sensor for continuous interstitial glucose measurement.
• To assess sensor suitability at different subcutaneous insertion sites (forearm and abdomen).
• To determine sensor accuracy and reliability under near-real-life conditions.

Main Methods:

• A pilot clinical study involving twelve subjects (10 with type 1 diabetes) was conducted over 8 hours.
• Subcutaneous sensors were applied to the forearm and abdomen.
• Capillary blood glucose was measured every 30 minutes for reference.
• Retrospective calibration using Deming regression was performed.

Main Results:

• After calibration, 95% limits of agreement were +/-60 mg/dL, improving to +/-38 mg/dL with a 15-minute time delay correction.
• Sensor sensitivity remained stable throughout the measurement period.
• Error grid analysis indicated 89.3% of values in Zone A and 9.6% in Zone B, with only 1.1% in the clinically unacceptable Zone D.
• No significant performance differences were observed between forearm and abdominal sites.

Conclusions:

• The viscometric affinity sensor demonstrates potential for in vivo glucose monitoring.
• Forearm and abdomen are equally suitable for subcutaneous sensor application.
• Advantages include signal stability and the absence of enzymatic or electrode reactions.