3D microfluidic analytical device on a single thread for smart point-of-care blood typing.

Area of Science:

• Biomedical Engineering
• Microfluidics
• Point-of-Care Diagnostics

Background:

• Accurate blood typing is critical for transfusions and medical diagnostics.
• Traditional blood typing methods can be time-consuming and require laboratory settings.
• Existing microfluidic devices often necessitate buffer solutions and complex handling.

Purpose of the Study:

• To introduce and validate three-dimensional microfluidic single thread-based analytical devices (3D-μSTADs) for point-of-care blood typing.
• To develop a novel method for blood typing that eliminates the need for buffer solutions.
• To create an integrated system for automated and accurate blood typing readout.

Main Methods:

• Fabrication of 3D-μSTADs using a double-sided imprinting process with PDMS on cotton threads.
• Utilizing the capillary action and fiber structures of cotton threads for differential wicking of agglutinated and free red blood cells.
• Development of a 3D printing blood-typing chip (3D-μThread-BT chip) integrating 3D-μSTADs with smartphone scanning.
• Implementation of color algorithmic modifications for automated result readout under varying light conditions.

Main Results:

• Successful classification of 105 ABO and RhD blood samples using the 3D-μSTADs.
• Demonstrated significant differences in wicking behavior between free and agglutinated red blood cells, enabling direct observation.
• The integrated 3D-μThread-BT chip provided accurate, on-site blood typing results via smartphone scanning.
• The system showed robustness against environmental light interference.

Conclusions:

• 3D-μSTADs offer a promising platform for accurate, buffer-free, point-of-care blood typing.
• The integrated 3D-μThread-BT chip provides a user-friendly and automated solution for blood typing.
• This technology has the potential to significantly improve accessibility and efficiency in blood typing diagnostics.
• Further research into 3D microfluidic single thread-based devices is warranted for diverse applications.