The ornamental design for a vitalsignsdevice, as shown and described.
FIG. 1 is a top perspective view of a vital signs device, showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a back elevational view thereof;
FIG. 4 is a left elevational view thereof;
FIG. 5 is a right elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines illustrate portions of the vital signs device that form no part of the claimed design. The broken lines form no part of the claimed design.