Fluid delivery cassette

A fluid delivery cassette comprising:

• a cartridge assembly comprising:
• a cartridge configured to contain a fluid,
• a septum positioned at a distal opening of the cartridge,
• a movable piston sealing a proximal opening of the cartridge, the piston being movable in an axial direction of the cartridge, and
• a drive assembly configured to move the piston in the axial direction toward the distal opening;
• and
• a needle assembly attached to the cartridge assembly,
• wherein the drive assembly includes:
• an axially extendible portion having a distal end that is controllably extendible from a retracted position to at least one extended position along a longitudinal axis, wherein the axially extendible portion is manufactured as a tapered helix having a diameter that varies from a first end of the tapered helix to a second end of the tapered helix so that the axially extendible portion is collapsible into the retracted position, and
• a rotatable force-transfer portion configured to receive an applied force and to cause the distal end of the axially extendible portion to move in the axial direction in response to the applied force.