The microfluidic devices were manufactured using standard microfabrication techniques. In brief, a single-layer photoresist design (SU-8; MicroChem, Newton, MA), with a 50-μm-thick layer was patterned on one silicon wafer via a photolithography masks and standard processing, according to the manufacturer’s protocols. The resulting patterned wafer was then used as a mold to produce
polydimethylsiloxane (Thermo Fisher Scientific, Waltham, MA) devices, which were subsequently, irreversibly bonded to
glass slides (1 in. × 3 in.; Thermo Fisher Scientific). The microfluidic design included four channels, each with their own inlet and outlet ports, and one common central imaging area (
Supplementary Fig. 1,
A and
B, Supplemental Digital Content 1,
http://links.lww.com/CCX/A66). This configuration allowed for the simultaneous imaging and analysis of multiple conditions (
Supplementary Fig. 1C, Supplemental Digital Content 1,
http://links.lww.com/CCX/A66). The chips were pretreated with a corona plasma gun (Elveflow, Paris, France) prior to sample loading to eliminate the need for fluid pumps.
Frydman G.H., Ellett F., Van Cott E.M., Hayden D., Majmudar M., Vanderburg C.R., Dalzell H., Padmanabhan D.L., Davis N., Jorgensen J., Toner M., Fox J.G, & Tompkins R.G. (2019). A New Test for the Detection of Direct Oral Anticoagulants (Rivaroxaban and Apixaban) in the Emergency Room Setting. Critical Care Explorations, 1(8), e0024.