A peristaltic pump which includes: (a) a plurality of effecters, actuated in a periodic manner upon by obstructive forces of a flexible infusion tube so as flow of infusion fluid is provided along said infusion tube, the magnitude of the obstructive forces are dependent upon the displacement of the moving effecters and (b) a plurality of balancing magnets providing balancing forces upon one or all the moving effecters, the balancing forces at each point along the path of motion of the moving effecters being of approximately equal magnitude to that of the obstructive forces at the point, such that the parasitic output due to work performed against the obstructive forces is approximately zero and yield is maximized.
