The ornamental design for a bloodprocessingdevice, as shown and described.
FIG. 1 is a perspective view of a blood processing device showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a left side view thereof; and,
FIG. 6 is a right side view thereof.
The broken lines in the drawing views are included for the purpose of illustrating portions of the blood processing device that form no part of the claimed design