Patent ID: 8840586

Claim:
A system, comprising: a reservoir for holding an infusion medium; a piston disposed at least partially within the reservoir, the piston being moveable to allow the infusion medium to fill into the reservoir and to force the infusion medium out of the reservoir; a plunger shaft connected to the piston, the plunger shaft having a mating portion for mating with a linkage portion of a drive device for driving the plunger shaft so as to move the piston to force the infusion medium out of the reservoir when the linkage portion of the drive device is mated with the mating portion of the plunger shaft; and a handle, the handle having a handle mating portion for mating with the mating portion of the plunger shaft, the handle further having a gripping portion for gripping the plunger shaft, the handle capable of being used by a user to move the plunger shaft so as to move the piston to allow the infusion medium to fill into the reservoir when the handle mating portion of the handle is mated with the mating portion of the plunger shaft; wherein the mating portion of the plunger shaft has a length such that at least some of the mating portion of the plunger shaft remains outside of the reservoir at all times while the plunger shaft is moved by the handle.