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Auto-injector for epinephrine injection

  • US 9,764,091 B2
  • Filed: 09/11/2015
  • Issued: 09/19/2017
  • Est. Priority Date: 09/09/2011
  • Status: Active Grant
First Claim
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1. A reloadable auto injector comprising:

  • a syringe lock comprising a syringe lock guide slot, the syringe lock guide slot having a syringe lock resting ledge;

    a plunger rod tube movable relative to the syringe lock, the plunger rod tube comprising a plunger rod tab being configured to move in the syringe lock guide slot, the plunger rod tube comprising a first locking member and at least a second locking member; and

    a plunger rod movable relative to the plunger rod tube, the plunger rod being configured to advance a syringe stopper of a syringe, the plunger rod comprising a plunger rod stop configured for engagement with the first locking member and the at least one second locking member;

    wherein the syringe lock is rotatable relative to the plunger rod tube,wherein, in a first angular position, the plunger rod tab rests on the syringe lock resting ledge preventing the plunger rod tube from advancing from a first position, andwherein, in a second angular position, the plunger rod tab is free of the syringe lock resting ledge allowing the plunger rod tube to advance to a second position, the second position being axially displaced relative to the first position,wherein when the plunger rod tube is in the first position, the first locking member is in engagement with the plunger rod stop preventing the plunger rod from advancing, andwherein when the plunger rod tube is in the second position, the first locking member is disengaged with the plunger rod stop allowing the plunger rod to be advanced until the at least one second locking member is in engagement with the plunger rod stop to prevent the plunger rod from being further advanced.

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