The ornamental design for a peristalticpump, as shown and described.
FIG. 1 is a top, right facing, perspective view of my new design for a peristaltic pump;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left elevational view thereof; and,
FIG. 7 is a right elevational view thereof.
The broken lines in the figure drawings depict portions of the peristaltic pump and are for the purpose of illustrating environmental structures only and form no part of the claimed design.