AN AUTO-INJECTOR FOR EPINEPHRINE INJECTION

摘要

A reloadable auto injector for epinephrine injection is provided. The reloadable auto injector has a separate needle insertion and medicine injection drivers wherein needle insertion driver is configured to be re-activated upon reloading. A syringe with a needle is movably positioned in a housing between a first position in which the needle is accommodated inside the housing and a second position in which the needle protrudes outside the housing. A plunger rod is normally locked to a plunger rod tube by at least one deflectable locking member. A syringe driver applies a force to the syringe to move the syringe together with plunger rod tube, plunger rod and plunger rod driver from the first position to the second position. In the second position, the locking member is unlocked and releases the plunger rod to thereby activate the plunger rod driver to advance the plunger rod in the syringe for delivering of medicament. A reload handle is connected to the syringe assembly so that user operation of the reload handle retracts the syringe to the first position and simultaneously reload the syringe driver to thereby ready the auto injector for delivering a further dose of medicament.