The ornamental design for a portableultrasounddevice, as shown and described.
FIG. 1 is a front view of a portable ultrasound device;
FIG. 2 is an upper front isometric side view thereof;
FIG. 3 is a lower front isometric side view thereof;
FIG. 4 is a first side view thereof;
FIG. 5 is a second side view thereof.
FIG. 6 is top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a rear view thereof.
The broken lines immediately adjacent to the shades areas represent the bounds of the claim, while all other broken lines are directed to environment and are for illustrative purposes only. The broken lines form no part of the claimed design.