Insertion device

FIG. 1 is a front perspective view of an insertion device showing our design.

FIG. 2 is a back perspective view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The dashed lines in FIGS. 1-7 represent environmental structure and form no part of the claimed design.