| 摘要 |
The application relates to automatic injection devices having a plunger, designed for delivering a dose of medicament from a container. In a first embodiment, the injection device 1 comprises a first and a second mechanical interlock; wherein the first interlock is arranged such that the device cannot be fired until a corresponding dose selector 4 has been operated to select a dose of medicament and the second interlock prevents the dose selector from being operated prior to removal of a boot 2. In a second embodiment the device comprises an axially moveable indicator element for indicating to a user that a selected dose has been delivered and in a third embodiment the device comprises a high friction surface between a plunger 7 and a housing 3 of the invention, arranged to reduce the initial acceleration of the plunger while a force is applied to the plunger during a needle insertion phase. A plunger 7 for use in the device, and a method of manufacturing the said plunger, involves the provision of first (7a/7b, Fig 16) and second (7c, Fig 16) plunger portions (formed as separate components), wherein the first portion can receive and accommodate the second portion in one of a plurality of positions. |
