the present invention relates to a medicament delivery device comprising a housing (10), which housing (10) is arranged to accommodate a medicament container (16), the device further comprises a drive mechanism (18) capable of, upon activation, expel a dose of medicament from said medicament container, the drive mechanism comprising a flat spiral spring (26). The invention is characterised in that at least a part (36) of an outermost turn of said flat spiral spring (26) is positioned on an outer surface of said housing (10).本發明有關藥物輸送裝置，包括外殼(10)，該外殼(10)被配置成可容納藥物容器(16)，該裝置另包括能夠於啟動時由該藥物容器排出一劑量之藥物的驅動機件(18)，該驅動機件包括平坦蝸旋彈簧(26)。本發明之特徵在於該平坦蝸旋彈簧(26)之最外邊線匝的至少一部分(36)被定位在該外殼(10)的外表面上。
