Fluid Delivery Cassette

Abstract: A fluid delivery cassette includes a cartridge assembly and a needle assembly. The cartridge assembly includes a cartridge configured to contain a fluid, a septum positioned at a distal opening of the cartridge, a piston sealing a proximal opening of the cartridge and movable in an axial direction, and a drive assembly configured to move the piston. The drive assembly includes an axially extendible portion having a distal end that is controllably extendible from a retracted position to an extended 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. The axially extendible portion can be manufactured as a tapered helix having a diameter that varies so that the axially extendible portion is collapsible into the retracted position.

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