DRIVE MECHANISM AND DRUG DELIVERY DEVICE

摘要

A drive mechanism (13) for a drug delivery device (1), comprising a housing (2), a transfer member (14), a drive member (16) and a piston rod (18). The transfer member (14) is configured to be rotated about a transfer member rotation axis (20) with respect to the housing (2) for delivering a dose of a drug (5). The drive member (16) is configured to be rotatable around a drive member rotation axis (39) with respect to the housing (2). The drive member (16) is arranged within the transfer member (14). When delivering the dose of the drug (5), the drive member (16) rotates about the drive member rotation axis (39). When delivering the dose of the drug (5), the drive member (16) and the transfer member (14) interact mechanically to convert rotation of the transfer member (14) about the transfer member rotation axis (20) into rotation of the drive member (16) about the drive member rotation axis (39), wherein rotation of the drive member (16) about the drive member rotation axis (39) is converted into translatory movement of the piston rod (18) with respect to the housing (2).