| 摘要 |
An injection device has a barrel (3) in which a cartridge (2) with a needle (1) lies, the needle initially being protected by a sheath (7) and a cap (4) effectively closing the forward end of the barrel (3). The needle (1) is on a carrier (12) which initially is in a forward position in relation to the cartridge (2) so that the rear end of the needle is clear of a membrane at the leading end of the cartridge. But when the cap (4) is fitted, it pushes on the carrier (12) and shifts it rearwardly with respect to the cartridge (2) so that the needle (1) penetrates the membrane. Also during fitting of the cap (4) it engages the sheath (7) so that, when it is removed for use of the device, the sheath is pulled off leaving the needle (1) exposed.
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