Auto injector with separate needle injection
First Claim
1. An auto injector having sequential control of needle insertion and dose injection, the auto injector having a housing and comprising structures accommodated in the housing, the structures including:
- a syringe with a needle, the syringe being movably positioned in the 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 configured to be advanced in the syringe for delivering at least one dose of medicament,a plunger rod tube having at least a first deflectable locking member and a second deflectable locking member 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 the at least one dose of medicament,wherein the housing is configured to unlock the at least first and second deflectable locking members and release the plunger rod from the plunger rod tube when the syringe and the plunger rod tube are advanced to the second position, thereby activating the plunger rod driver to advance the plunger rod in the syringe for delivering the at least one dose of medicament,wherein the housing is configured to allow for the at least first and second deflectable locking members to enable deflection away from the plunger rod when the syringe and the plunger rod tube are advanced to the second position,wherein the plunger rod tube further comprises the at least first and second deflectable locking members configured to sequentially engage with the plunger rod stop,wherein the housing comprises a first opening and a second opening configured to align with the at least first and second deflectable locking members, respectively, when the syringe is in the second position,wherein the at least first and second deflectable locking members are arranged with respect to each other at different distances along a movement direction of the plunger rod tube, andwherein the structures are accommodated in the housing before and during needle insertion and during dose injection.
1 Assignment
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Accused Products
Abstract
An auto injector having sequential control of needle insertion and dose injection is disclosed. 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 tube has at least one locking member configured to normally lock a plunger rod to the plunger rod tube. 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 at least one dose of medicament.
44 Citations
26 Claims
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1. An auto injector having sequential control of needle insertion and dose injection, the auto injector having a housing and comprising structures accommodated in the housing, the structures including:
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a syringe with a needle, the syringe being movably positioned in the 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 configured to be advanced in the syringe for delivering at least one dose of medicament, a plunger rod tube having at least a first deflectable locking member and a second deflectable locking member 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 the at least one dose of medicament, wherein the housing is configured to unlock the at least first and second deflectable locking members and release the plunger rod from the plunger rod tube when the syringe and the plunger rod tube are advanced to the second position, thereby activating the plunger rod driver to advance the plunger rod in the syringe for delivering the at least one dose of medicament, wherein the housing is configured to allow for the at least first and second deflectable locking members to enable deflection away from the plunger rod when the syringe and the plunger rod tube are advanced to the second position, wherein the plunger rod tube further comprises the at least first and second deflectable locking members configured to sequentially engage with the plunger rod stop, wherein the housing comprises a first opening and a second opening configured to align with the at least first and second deflectable locking members, respectively, when the syringe is in the second position, wherein the at least first and second deflectable locking members are arranged with respect to each other at different distances along a movement direction of the plunger rod tube, and wherein the structures are accommodated in the housing before and during needle insertion and during dose injection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An auto injector having sequential control of needle insertion and dose injection, the auto injector having a housing and comprising structures accommodated in the housing, the structures including:
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a syringe with a needle, the syringe being movably positioned in the 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 configured to be advanced in the syringe for delivering at least one dose of medicament, a plunger rod tube having at least a first deflectable locking member and a second deflectable locking member configured to interact with a plunger rod stop to normally lock the plunger rod to the plunger rod tube, a first spring configured to apply a force to the syringe thereby moving the syringe from the first position to the second position, the first spring being further configured to advance the plunger rod tube with the plunger rod to the second position, a second spring configured to apply a force to the plunger rod to advance the plunger rod in the syringe for delivering at least one dose of medicament, wherein the at least first and second locking members are configured to be unlocked upon advancing the plunger rod tube with the plunger rod to the second position thereby unlocking the plunger rod from the plunger rod tube and allowing the second spring to advance the plunger rod in the syringe, wherein the plunger rod tube further comprises the at least first and second deflectable members configured to sequentially engage with the plunger rod stop, wherein the housing comprises a first opening and a second opening configured to align with the at least first and second deflectable members, respectively, when the syringe is in the second position, wherein the at least first and second deflectable locking members are arranged with respect to each other at different distances along a movement direction of the plunger rod tube, and wherein the structures are accommodated in the housing before and during needle insertion and during dose injection.
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26. A method of delivering a dose of medicament using an auto injector, wherein the auto injector has a housing for accommodation of a syringe assembly, the syringe assembly comprising a syringe with a needle, the syringe being movably positioned in the 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 configured to be advanced in the syringe for delivering the dose of medicament, a plunger rod tube having at least a first deflectable locking member and a second deflectable locking member configured to interact with a plunger rod stop to lock the plunger rod to the plunger rod tube when not delivering medicament,
the method comprising the steps of: -
activating a syringe driver to apply a force to the syringe thereby moving the syringe from the first position to the second position, and further advancing the plunger rod tube with the plunger rod to the second position, in the second position, unlocking the at least first and second deflectable locking members and activating a plunger rod driver to apply a force to the plunger rod to thereby advance the plunger rod in the syringe for delivering at least one dose of medicament, wherein the syringe driver is a first spring and the plunger rod driver is a second spring, wherein the at least first and second deflectable locking members are configured to sequentially engage with the plunger rod stop, wherein the housing comprises a first opening and a second opening configured to align with the at least first and second deflectable locking members, respectively, when the syringe is in the second position, wherein the at least first and second deflectable locking members are arranged with respect to each other at different distances along a movement direction of the plunger rod tube, and wherein the syringe assembly, the plunger rod, and the plunger rod tube are accommodated in the housing before and during needle insertion and during dose injection.
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Specification