Microfluidic system for simultaneous optical measurement of platelet aggregation at multiple shear rates in whole blood

Lab on a Chip
Melissa LiCraig R Forest

Abstract

Thrombosis is the pathological formation of platelet aggregates which occlude blood flow causing stroke and heart attack-the leading causes of death in developed nations. Instrumentation for diagnosing and exploring treatments for pathological platelet aggregation thus has the potential for major clinical impact. Most current thrombosis methods focus on single flow conditions, non-occlusive platelet adhesion, or low shear rates and so are limited in their application to comparative studies involving multiple, pathological test conditions (e.g., shear rate, stenotic geometries that mimic arteries, and rapid platelet accumulation to occlusion). The field could benefit from a low volume, high throughput, short analysis time, and low cost system while minimizing sample handling. We report on the design, fabrication, testing, and application of a microfluidic device and associated optical system for simultaneous measurement of platelet aggregation at multiple initial shear rates within four stenotic channels in label-free whole blood. Following computational design, requisite shear rates were achieved in the device by micro- surface milling a mold and subsequent PDMS casting. We applied the microfluidic system to measure platelet ag...Continue Reading

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