| 摘要 |
A reloadable automatic injector comprises a reusable power pack assembly for effectuating multiple injection operations. The power pack assembly includes an outer body and an energy releasing assembly disposed within the body. The energy releasing assembly is capable of providing multiple energy releasing strokes. A disposable cartridge assembly is provided which is engageable with the power pack assembly and forms an elongate injection assembly therewith. The cartridge assembly is adapted to receive energy from the power pack during one of the energy releasing strokes. The cartridge assembly includes a housing in which a charge of medicament and a needle is contained. A plunger is disposed within the housing for forcing the medicament through the needle. The cartridge assembly receives energy from the power pack assembly during one of the energy releasing strokes to enable the needle to project from the protected position to an unprotected projecting position from the housing and to enable the plunger to force the medicament through the needle. In addition, a needle return spring is provided for returning the needle from the unprotected position to the protected position within the housing so that the housing provides the needle with a rigid protective outer covering for sanitary disposal of the cartridge assembly. |
