Automatic injection device

Patent metadata

Field	Value
Publication number	US-9526837-B2
Application number	US-201314426304-A
Country	US
Kind code	B2
Filing date	Aug 28, 2013
Priority date	Sep 5, 2012
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

The present invention relates to an automatic injection device ( 1 ) comprising: a container ( 2 ) having a longitudinal axis A and movable between a first position and a second position, in which the needle is inserted, biasing means ( 8 ), for moving the container to its second position, retaining means ( 70, 74, 74 b ) for maintaining said biasing means in a first stressed state, triggering means ( 90, 91 e ) for releasing said retaining means, said retaining means comprising a lever member having a rotatable cylinder part and a radial projection extending therefrom, said radial projection being in a first angular position when said retaining means is in its passive condition, said radial projection being in a second angular position, different from said first angular position, when said retaining means is in its active condition, said rotatable cylinder part being included in a transversal plane of said longitudinal axis A.

First claim

The invention claimed is:

1. A device for injection of a product into an injection site, said device comprising:
a housing having a longitudinal axis A,
a container located within the housing, said container capable of holding the product to be injected, said container including a proximal end and a distal end,
a stopper located at the proximal end of the container for substantially closing the proximal end of the container, said stopper capable of being moved in a distal direction within the container to expel the product to be injected,
a needle located at the distal end of the container, said needle configured to allow the product to exit there through, said container being movable with respect to said housing between a first position, in which the needle does not extend beyond a distal end of the housing, and a second position, which is distally spaced with respect to said first position, in which the needle extends beyond the distal end of the housing,
a biasing member, coupled to said container and to said housing during movement of the container at least from said first position to said second position, said biasing member designed for exerting a distal force to said container so as to move said container from the first position to the second position when the biasing member transitions from a first state to a second state, wherein said second state is less stressed than said first state,
a retaining device coupled to said container and to said housing when the container is in the first position, for releasably maintaining said biasing member in the first state, said retaining device being capable of moving from a passive condition, in which the retaining device maintains said biasing member in the first state, to an active condition, in which said biasing member is free to expand to its second state,
a trigger capable of moving said retaining device from its passive condition to its active condition,
wherein
said retaining device comprises a lever member having a rotatable cylinder part and at least a radial projection extending from said cylinder part, said radial projection being in a first angular position when said retaining device is in its passive condition, and said radial projection being in a second angular position, which is different from said first angular position, when said retaining device is in its active condition, and wherein said rotatable cylinder part is included in a transversal plane of said longitudinal axis A.

2. The device of claim 1 , wherein said biasing member is a spring linked to said stopper via a plunger rod, said device further comprising a releasable maintaining member for maintaining said container fixed with respect to said plunger rod when said spring transitions from its first state to its second state, said maintaining member being released when said spring reaches its second state.

3. The device of claim 2 , wherein said maintaining member comprises a hook fixed with respect to said container, said hook trapping a rim located on said plunger rod, wherein the rim is only allowed to escape from said hook under the force of the spring when said container has reached its second position and said spring is in its second state.

4. The device of claim 2 , wherein the cylinder part of the lever member is rotatably received within a recess of said plunger rod, said radial projection is engaged within an abutment surface fixed with respect to said housing when said radial projection is in its first angular position, and said radial projection is disengaged from said abutment surface when said radial projection is in its second angular position.

5. The device of claim 4 , wherein said trigger comprises a button mounted in sliding translation with respect to said housing, said button comprising a pushing surface accessible to a user, said button further comprising a sloped surface capable of cooperating with said radial projection for rotating said cylinder part and moving said radial projection from its first angular position to its second angular position, upon application of a pushing force to said pushing surface.

6. The device of claim 1 , wherein, in its first angular position, the radial projection extends in the distal direction.

7. The device of claim 6 , wherein said button is mounted in sliding translation with respect to said housing along a direction parallel to said longitudinal axis A, said button further comprising a sloped surface, said sloped surface thereby moving said radial projection out of the distal direction towards its second angular position when cooperating with said radial projection.

8. The device of claim 1 , further comprising: a locking member for preventing said trigger from moving said retaining device from its passive condition to its active condition, said locking member being releasable, and
a deactivating device for releasing the locking member.

9. The device of claim 5 , wherein the locking member comprises a movable surface of said device, said surface being movable between a first position, in which said surface faces said radial projection so as to prevent cooperation between said radial projection and said sloped surface, to a second position, in which said surface is released and does not face said radial projection, thereby allowing cooperation between said radial projection and said sloped surface.

10. The device of claim 8 , wherein said deactivating device is capable of going from a storage position, in which it does not release the locking member, to an active position in which it releases the locking member and the trigger may be activated, the device further comprises a storage elastic return member for urging said deactivating device back in its storage position as long as the trigger has not been activated.

11. The device of claim 1 , further comprising:
a fixing member for maintaining said container in its second position with respect to said housing, and
an urging member coupled to said stopper and to said housing when said container is in its second position, said urging member configured for distally moving said stopper when transitioning from a first state to a second state, said second state being less stressed than said first state, thereby resulting in injection of the product.

12. The device of claim 2 , wherein said spring is further capable of transitioning from its second state to a third state, during which said spring moves the stopper distally, said third state being less stressed than said second state, and wherein said spring forms both said biasing member and said urging member.

13. The device of claim 11 , wherein the fixing member comprises a peg fixed with respect to said container and a window is located on said housing, said peg being locked within said window when said container is in its second position with respect to said housing.

14. The device of claim 1 , further comprising:
a needle protection member, at least partially received within said housing, and movable with respect to said housing when said container is fixed in its second position with respect to said housing between an insertion position, in which a distal tip of the needle extends beyond the distal end of the needle protection member, and a final position, in which the distal tip of the needle does not extend beyond the distal end of the needle protection member, and
an elastic return member, coupled to said needle protection member and to said container, and designed for automatically moving said needle protection member from its insertion position to its final position, upon removal of the device from an injection site by a user.

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Assignees

• Becton Dickinson France

Inventors

• Carrel Franck
• Maritan Lionel
• Perot Frederic

Classifications

• A61M2005/3104

  Caps for syringes without needle · CPC title

• A61M2205/583

  by visual feedback · CPC title

• A61M5/2033 Primary

  Spring-loaded one-shot injectors with or without automatic needle insertion (multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287) · CPC title

• A61M2005/3143

  Damping means for syringe components executing relative movements, e.g. retarders or attenuators slowing down or timing syringe mechanisms · CPC title

• A61M2205/582

  by tactile feedback · CPC title