The ornamental design for a bedassistancedevice, as shown and described.
FIG. 1 is a perspective view of the bed assistance device in accordance with the present invention;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a front view thereof;
FIG. 7 is a rear view thereof; and,
FIG. 8 is another side perspective view where the bed assistance device is connected to a bed.
The broken lines in FIG. 8 showing a bed, depict environmental subject matter that forms no part of the claimed design. The remaining broken lines depict portions of the bed assistance device and form no part of the claimed design.