Injection device with projections disposed on the passage to reduce the effective bore of the passage

Patent metadata

Field	Value
Publication number	US-9522233-B2
Application number	US-201113582749-A
Country	US
Kind code	B2
Filing date	Mar 4, 2011
Priority date	Mar 5, 2010
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

An injection device includes a cap which is withdrawn from the front of the device before use to remove a boot from the needle. The cap has fingers which grip the boot and which pass down a passage through which the needle projects to inject a dose. The passage has projections disposed to reduce the effective bore of the passage, the projections having inwardly inclined resilient portions which allow the boot to be withdrawn forwardly through the passage but prevent a finger being poked into the passage.

First claim

The invention claimed is:

1. An injection device comprising:
a body portion;
a syringe having a forward end and a needle at the forward end; and
one or more walls defining a passage extending from a rearward end to a forward end and relative to which said syringe may pass between a rearward, retracted position in which a forward tip of the needle is located within an interior of the passage rearward of said forward end so as to be shrouded by said passage and a forward, extended position in which said forward tip projects from the forward end of said passage,
wherein said passage includes a plurality of transverse projections within the interior of said passage and projecting inwardly from an inner surface of the wall of the passage at an intermediate position between said forward end and rearward end of the passage to reduce an effective cross-section of the passage, the projections including resiliently deflectable portions inclined inwardly towards the forward end of the passage, and
wherein at least forward ends of all of the resiliently deflectable portions are forward of the forward tip of the needle when the syringe is in the rearward, retracted, position, and
wherein the walls of the passage are defined by a needle shroud element which is movable relative to the body portion and forwardly biased, such that when the syringe is in the forward extended position, the needle shroud element may move to an extended position in which the forward tip of the needle is located within the interior of the passage rearward of said forward end so as to be shrouded by said passage.

2. The injection device according to claim 1 , wherein a transverse dimension of a cross-section of the forward end of the passage is less than the diameter of a barrel of said syringe whereby the projections engage and exert a braking effect on the syringe should the syringe move forwards beyond a predetermined forward position.

3. The injection device according to claim 2 , wherein said syringe is movable relative to the body portion from a rearward position to a forward position.

4. The injection device according to claim 2 , wherein the syringe includes a boot element which covers the syringe needle and which is withdrawable longitudinally to expose the needle, the injection device further including a removable cap which initially covers at least part of the front end of the device and which is removable longitudinally to withdraw the boot.

5. The injection device according to claim 1 , wherein said syringe is movable relative to the body portion from a rearward position to a forward position.

6. The injection device according claim 1 , wherein the syringe includes a boot element which covers the syringe needle and which is withdrawable longitudinally to expose the needle, the injection device further including a removable cap which initially covers at least part of the front end of the device and which is removable longitudinally to withdraw the boot.

7. The injection device according to claim 6 , wherein said boot element has an outer maximum transverse dimension receivable within a rearward end of said passage with a clearance being present between the boot element and the rearward end of said passage, the maximum transverse dimension being greater than a cross-section of the forward end of said passage, said boot element being passable through the forward end of said passage on deflection of said deflectable portions.

8. The injection device according to claim 7 , wherein said cap includes a plurality of fingers which, when the cap is in its initial position, extend rearwardly down the passage to engage the boot.

9. The injection device according to claim 6 , wherein said cap includes a plurality of fingers which, when the cap is in its initial position, extend rearwardly down the passage to engage the boot.

10. The injection device according to claim 9 , wherein the fingers on the cap alternate with the projections in the angular direction about the longitudinal axis of the passage.

11. The injection device according to claim 10 wherein the transverse projections and the fingers each have inner arcuate surfaces that together define a rearward generally cylindrical surface that surrounds an external surface of said boot element with a clearance being present between the external surface of said boot element and the rearward generally cylindrical surface.

12. The injection device according to claim 9 , wherein said passage includes support surfaces for engaging outer surfaces of the plurality of fingers on the cap as the cap is withdrawn.

13. The injection device according to claim 1 , wherein an attempt to force access to the passage from the front end causes resilient deflection of the resiliently deflectable portions to further reduce the effective bore of the passage.

14. The injection device according to claim 1 , wherein the needle shroud element is telescopically mounted on the body.

15. The injection device according to claim 1 , wherein the needle shroud element is initially held against the forward bias in the rearward retracted position whereby the forward end of the needle shroud element is proximal to a forward end of the housing.

16. An injection device comprising:
a body portion; a syringe having a forward end, a needle at the forward end, and a boot covering the needle; one or more walls defining a passage extending from a rearward end to a forward end and relative to which said syringe may pass between a rearward, retracted position in which a forward tip of the needle is located within an interior of the passage rearward of said forward end so as to be shrouded by said passage and a forward, extended position in which said forward tip projects from the forward end of said passage; a plurality of elongate transverse projections within the interior of said passage and projecting inwardly from an inner surface of the wall of the passage at an intermediate position between said forward end and said rearward end of the passage to reduce a cross-section of the passage; and a removable cap initially disposed at the front end of the device and having a plurality of elongate fingers which when the cap is in its initial position extend rearwardly down the passage to engage the boot, wherein said fingers are angularly interspersed with said transverse projections.

17. The injection device according to claim 16 , wherein the walls of the passage comprise a needle shroud element which is relatively movable to the body portion.

18. An injection device comprising: a body portion;
a syringe having a forward end and a needle at the forward end; and
a needle shroud element which is movable relative to the body portion and forwardly biased by a forward bias element,
wherein the needle shroud element includes a wall that defines a passage extending from a rearward end to a forward end and relative to which said syringe is passable between
i) a rearward retracted position in which a forward tip of the needle is located within an interior of the passage rearward of said forward end so as to be shrouded by said passage and
ii) a forward extended position in which said forward tip projects from the forward end of said passage,
wherein when the syringe is in the forward extended position, the needle shroud element is movable to an extended position in which the forward tip of the needle is located within the interior of the passage rearward of said forward end so as to be shrouded by said passage, wherein said passage, defined by said needle shroud element, includes a plurality of transver

Assignees

• Bicknell Stephen
• Peel Alan
• Owen Mumford Ltd

Inventors

• Bicknell Stephen
• Peel Alan

Classifications

• A61M5/20 Primary

  Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically (A61M5/142 {, A61M5/46} take precedence; {hypodermic projectiles F42B12/54}) · CPC title

• A61M2005/206

  With automatic needle insertion · CPC title

• A61M5/326

  Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user · CPC title

• A61M2005/3247

  Means to impede repositioning of protection sleeve from needle covering to needle uncovering position · CPC title

• A61M5/3202

  Devices for protection of the needle before use, e.g. caps (A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001) · CPC title