The ornamental design for a microfluidicdevice, as shown and described.
FIG. 1 is a top view of a microfluidic device in accordance with the present disclosure.
FIG. 2 is a bottom view of the microfluidic device of FIG. 1.
FIG. 3 is a left side view of the microfluidic device of FIG. 1.
FIG. 4 is a right side view of the microfluidic device of FIG. 1.
FIG. 5 is a front view of the microfluidic device of FIG. 1.
FIG. 6 is a back view of the microfluidic device of FIG. 1; and,
FIG. 7 is a top, left side, front view of the microfluidic device of FIG. 1.
The broken lines and the areas enclosed by broken lines and solid lines depict portions of the microfluidic device that form no part of the claimed design.