| 摘要 |
An injector pen for setting and delivering doses of a drug from a cartridge 8 is characterized by a manual dose selector 4 that slides axially, without rotation, relative to a body 2 of the pen. An arrangement of concentric cylinders 30,28,24 incorporating a non-locking thread 29,31 couples the dose selector 4 to a piston rod 16 having an external helical thread 19. Means 70,76,78 may be provided for preventing a further dose from being set by the selector 4 if less than a full dose of drug remains in the cartridge 8. Means 20,60 may further be provided to facilitate resetting the piston rod 16 to its starting position after the used drug cartridge 8 has been removed from the pen. |
