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Micro-elastometry on whole blood clots using actuated surface-attached posts (ASAPs).

Robert M Judith1, Jay K Fisher, Richard Chasen Spero

  • 1University of North Carolina at Chapel Hill Department of Physics & Astronomy, Chapel Hill, NC, USA. rsuper@physics.unc.edu.

Lab on a Chip
|January 17, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a new microfluidic elastometry technology to measure blood clot stiffness in real-time. The actuated surface-attached post (ASAP) system offers a point-of-care solution for small-volume hemostatic assays.

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Area of Science:

  • Biomedical Engineering
  • Hematology
  • Microfluidics

Background:

  • Assessing blood clot formation and stiffness is crucial for diagnosing hemostatic disorders.
  • Existing methods often require large sample volumes and lack point-of-care capabilities.

Purpose of the Study:

  • To develop and validate a novel microfluidic elastometry system for measuring the stiffness of forming blood clots.
  • To demonstrate the system's utility for point-of-care and small-volume hemostatic assays.

Main Methods:

  • A microfluidic chip with a micropost array is used to apply shear stress to small blood samples (20 μL).
  • Magnetic actuation of surface-attached posts allows for real-time measurement of clot-induced torque via optical transmission.
  • A quasi-static model is employed to predict applied torque, and results are validated against a commercial thromboelastograph.

Main Results:

  • The system accurately measures the stiffness of blood clots as they form.
  • Experimental validation confirms strong correlation with a commercial thromboelastograph.
  • The technology demonstrates feasibility for real-time, small-volume clot stiffness assessment.

Conclusions:

  • Actuated surface-attached post (ASAP) technology provides a novel method for microfluidic elastometry of blood clots.
  • This technology addresses a clinical need for point-of-care and small-volume elastic hemostatic assays.
  • ASAP technology shows promise for improving the diagnosis and management of hemostatic disorders.