| 摘要 |
An automatic injector is disclosed having a body (1), a medicament chamber (19) defined in the body, a needle (11) held in a sheathed position within the body, releasable drive means (4) which when released drives the needle from its sheathed position to an unsheathed position, and expulsion means (5, 10) for discharging the medicament through the needle (11), characterised in that seal means (12) is provided at the forward end of the medicament chamber (19), and in that the expulsion means (5, 10) has an expulsion element (10) and the needle (11) is movable forwards in a seal-breaking phase of movement relative to the expulsion element (10) upon activation of the injector so as to pierce the seal means (12). Thus it is not the entire expulsion means (5, 10) plus needle (11) which moves forward to break the seal (12) and vent the medicament chamber (19), but only the needle (11). |
