Auto-injector for epinephrine injection
First Claim
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.
1 Assignment
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Accused Products
Abstract
A reloadable auto injector for epinephrine injection is provided. The reloadable auto injector has a separate needle insertion and medicine injection drivers (1600) wherein needle insertion driver (1200) is configured to be re-activated upon reloading. A syringe 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 (1500) is normally locked to a plunger rod tube (1100) by at least one deflectable locking member (1110). A syringe driver (1200) 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 (1110) 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 (1400) 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.
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Citations
28 Claims
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1. A reloadable auto injector comprising:
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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, and wherein, 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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An auto injector comprising:
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a housing; a syringe assembly comprising a syringe with a needle and a syringe stopper positioned in the syringe and sealing syringe content; a syringe lock comprising a syringe lock guide slot, the syringe lock guide slot having a syringe lock resting ledge, the syringe lock being at least partly arranged inside the housing; a plunger rod tube movable relative to the syringe lock and stationary relative to the syringe, the plunger rod tube comprising a plunger rod tube tab being configured to move in the syringe lock guide slot, the plunger rod tube being at least partly arranged inside the syringe lock; a plunger rod movable relative to the plunger rod tube, the plunger rod being configured to advance the syringe stopper of the syringe, the plunger rod being at least partly arranged inside the plunger rod tube; the syringe lock being rotatable relative to the plunger rod tube and the housing, wherein, in a first angular position, the plunger rod tube tab rests on the syringe lock resting ledge preventing the plunger rod tube and the syringe from advancing from a first position, and wherein in a second angular position, the plunger rod tab is free of the syringe lock resting ledge allowing the plunger rod tube and the syringe to advance to a second position, the second position being axially displaced relative to the first position. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A reloadable auto injector comprising:
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a plunger rod tube comprising a first locking member and at least one second locking member; a syringe assembly comprising a syringe with a needle and a syringe stopper positioned in the syringe and sealing syringe content; a syringe lock, the plunger rod tube being movable relative to the syringe lock and stationary relative to the syringe, the syringe lock being configured to control movement of the plunger rod tube relative to the syringe lock; a plunger rod movable relative to the plunger rod tube and the syringe, the plunger rod being configured to advance the syringe stopper of the syringe, the plunger rod comprising a plunger rod stop configured to engage with the first locking member and the at least one second locking member; wherein, when the plunger rod tube is in a first position relative to the syringe lock, the first locking member is in engagement with the plunger rod stop preventing the plunger rod from advancing, and wherein when the plunger rod tube is in a second position relative to the syringe lock, 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 preventing the plunger rod from being further advanced. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification