Auto-injector for epinephrine injection

摘要

A reloadable auto injector for epinephrine injection is provided. 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.

主权项

1. A reloadable auto injector for adrenaline injection, the auto injector comprising:
a housing for accommodation of a syringe with a needle, the syringe being movably positioned in the housing between a first position in which position the needle is accommodated inside the housing and a second position in which position the needle protrudes outside the housing, a plunger rod configured to be advanced in the syringe for delivering at least one dose of medicament, a plunger rod tube having a plurality of deflectable locking members configured to interact with a plunger rod stop to normally lock the plunger rod to the plunger rod tube, a syringe driver configured to apply a force to the syringe thereby moving the syringe from the first position to the second position, the syringe driver being further configured to advance the plunger rod tube with the plunger rod to the second position, a plunger rod driver being configured to apply a force to the plunger rod to advance the plunger rod in the syringe for delivering one dose of medicament upon unlocking of each of the plurality of deflectable locking members, a reload mechanism configured to retract the syringe from the second position to the first position and reload the syringe driver to allow a repeated activation of the syringe driver, wherein the reload mechanism is configured to unlock a first deflectable locking member of the plurality of deflectable locking members upon a first movement of the syringe from the first position to the second position to thereby release the plunger rod from the plunger rod tube for delivering a first dose of medicament, and unlock a second deflectable locking member of the plurality of deflectable locking members upon a second movement of the syringe from the first position to the second position to thereby release the plunger rod from the plunger rod tube for delivering a second dose of medicament, wherein the reload mechanism is configured to receive an operator input to activate the auto injector for a further injection, wherein the reload mechanism has a first opening configured to be aligned with the first deflectable locking member when the plunger rod tube is advanced to the second position a first time and a second opening configured to be aligned with the second deflectable locking member when the plunger rod tube is advanced to the second position a second time.