Carbon Nanotube Strain Sensor Based Hemoretractometer for Blood Coagulation Testing.

Area of Science:

• Biomedical Engineering
• Materials Science
• Clinical Diagnostics

Background:

• Coagulation monitoring is critical for managing bleeding disorders, thrombosis, and perioperative care.
• Current coagulation assays often require large equipment and complex procedures, limiting their use at the point-of-care.
• There is a need for rapid, portable, and cost-effective methods for assessing blood clotting dynamics.

Purpose of the Study:

• To develop a miniaturized, point-of-care device for real-time blood coagulation monitoring.
• To utilize dynamic clot retraction force measurement for assessing coagulation status.
• To integrate carbon nanotube strain sensors for label-free electrical readout.

Main Methods:

• A novel device was designed to measure clot retraction force using a flexible, force-sensing beam with micropillar arrays.
• Carbon nanotube films were deposited onto the beam to function as strain sensors for real-time electrical readout.
• Mechanical and electrical properties of the force-sensing beam were characterized and optimized.
• The device's performance was validated against an established imaging method for coagulation assessment.

Main Results:

• The developed device successfully measured dynamic clot retraction force in real time.
• Results obtained from the miniaturized device showed consistency with traditional imaging methods.
• The device demonstrated the ability to differentiate blood samples with varying coagulation profiles.
• Optimized device design and carbon nanotube sensor integration enabled label-free electrical detection.

Conclusions:

• A miniaturized, point-of-care device for blood coagulation testing has been successfully developed.
• The device leverages clot retraction force measurement and carbon nanotube strain sensors for efficient monitoring.
• This technology offers a low-cost, small-footprint, and low-sample-volume solution with significant potential for clinical applications in coagulation diagnostics.