Fluid delivery system

An infusion system for the infusion of a liquid therapeutic product comprising a fluid delivery system, the fluid delivery system comprising:

• a reservoir for storing a fluid;
• a pumping chamber having a volume, an inlet valve providing selective fluid communication between the pumping chamber volume and the reservoir, an outlet valve, and a movable wall the displacement of which changes the pumping chamber volume;
• and
• an actuator for moving a drive member in reciprocating motion;
• wherein the drive member is operatively coupled to the movable wall of the pumping chamber for displacement of the movable wall to vary the pumping chamber volume between a minimum volume and a maximum volume;
• wherein the inlet valve and the outlet valve each comprise a one-way check valve;
• and
• wherein, when energized, the actuator is arranged to displace the movable wall from a starting position through uninterrupted filling of the pumping chamber from the reservoir between the minimum volume and maximum volume, where the starting position corresponds to a pumping chamber volume less than the maximum volume.

A method of operating a fluid delivery system comprising a reservoir, a pumping chamber having a volume, an inlet valve, an outlet valve and a movable wall, an actuator and a drive member, wherein the inlet valve and the outlet valve each comprise a one-way check valve, and the inlet valve providing selective fluid communication between the pumping chamber volume and the reservoir, the method comprising:

• storing a fluid in the reservoir;
• operatively coupling the drive member to the movable wall of the pumping chamber;
• energizing the actuator to move the drive member in reciprocating motion and thereby displacing the movable wall to change the pumping chamber volume between a minimum volume and a maximum volume;
• wherein, when energized, the actuator moves the movable wall from a starting position through uninterrupted filling of the pumping chamber from the reservoir between the minimum volume and maximum volume, where the starting position corresponds to a pumping chamber volume less than the maximum volume.