DEVICE FOR ADMINISTERING A FLUID PRODUCT

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A device (10) for administering a fluid product, in particular a drug in liquid form, with a modular design, comprising a re-usable base unit (1) comprising a drive device (127); an exchangeable cartridge unit (2) comprising a conveying device (6), wherein the conveying device comprises a piston pump comprising a rotating piston (231); and a transmission device (125) which can transmit mechanical movement from the drive device onto the conveying device.