Medicament delivery device comprising a locking mechanism

Patent metadata

Field	Value
Publication number	US-10357617-B2
Application number	US-201414902166-A
Country	US
Kind code	B2
Filing date	Mar 12, 2014
Priority date	Mar 25, 2013
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

A medicament delivery device includes a tubular housing having opposite proximal and distal ends; an injection drive configured to exert force on a medicament container to expel medicament; and an injection drive holder configured to releasably hold the injection drive in a pre-tensioned state before injection of the medicament. The injection drive holder includes a tubular extension part for receiving the injection drive to be axially movable therein and a release ring coaxially arranged on the tubular extension part, the release ring being axially movable between proximal and distal positions along the outer surface of the tubular extension part. The tubular extension part is configured to engage with the injection drive when the release ring is at the proximal position and release the injection drive as the release ring moves distally from the proximal position.

First claim

The invention claimed is:

1. A medicament delivery device, comprising:
a tubular housing having a proximal end and an opposite distal end;
a drive configured to exert force on a medicament container to expel medicament; and
a drive holder configured to releasably hold the drive in a pre-tensioned state before delivery of the medicament;
wherein the drive holder comprises a tubular extension part configured to receive the drive such that the drive is axially movable therein, and a release ring coaxially arranged on the tubular extension part, the release ring being axially movable between proximal and distal positions along an outer surface of the tubular extension part,
wherein the tubular extension part is configured to engage with the drive when the release ring is at the proximal position and to release the drive as the release ring moves distally from the proximal position, and
wherein the release ring includes a distal part arranged with at least one pair of lock arms extending in a proximal direction from the distal part towards a proximal end of the medicament delivery device, the at least one pair of lock arms being configured to engage with a corresponding slot formed on the outer surface of the tubular extension part when the release ring is at the proximal position.

2. The medicament delivery device of claim 1 , wherein the tubular extension part comprises at least one release hook on the outer surface of the tubular extension part; and in the proximal position, the at least one release hook is configured to be pressed radially inward by the release ring, thereby engaging with a groove on the drive.

3. The medicament delivery device of claim 2 , wherein the at least one release hook is configured to move outward to release the drive when the release ring moves distally from the proximal position.

4. The medicament delivery device of claim 1 , further comprising a needle guard arranged to be biased in the proximal direction to cover a needle, wherein the needle guard is configured to move distally, exposing the needle and forcing the release ring in a distal direction, when the medicament delivery device is applied and pressed on a delivery site.

5. The medicament delivery device of claim 4 , wherein the tubular extension part comprises at least one release hook on the outer surface of the tubular extension part; and in the proximal position, the at least one release hook is configured to be pressed radially inward by the release ring, thereby engaging with a groove on the drive.

6. The medicament delivery device of claim 5 , wherein the release hook is configured to move outward to release the drive when the release ring moves distally from the proximal position.

7. The medicament delivery device of claim 4 , further comprising an activator arranged between the needle guard and the release ring, the activator including at least one activation leg extending in a distal direction to correspond with the at least one pair of lock arms, wherein the at least one activation leg is configured to wedge in between the at least one pair of lock arms, when the activator is forced distally by the needle guard, thereby unlocking the at least one pair of lock arms and the slot.

8. The medicament delivery device of claim 7 , further comprising a medicament container holder coaxially arranged within the needle guard and the activator; wherein the medicament container holder has on an outer surface thereof an activator holding member for holding the activator in place; and the activator holding member releasably engages a corresponding holding member provided on the activator.

9. The medicament delivery device of claim 7 , wherein the at least one pair of lock arms are arranged on opposite sides of the release ring, and the at least one activation leg is arranged correspondingly on the activator.

10. The medicament delivery device of claim 9 , further comprising a medicament container holder coaxially arranged within the needle guard and the activator; wherein the medicament container holder has on an outer surface thereof an activator holding member for holding the activator in place; and the activator holding member releasably engages a corresponding holding member provided on the activator.

11. The medicament delivery device of claim 10 , wherein the corresponding holding member provided on the activator is a distal holding member arranged at a distal position on the at least one activation leg, wherein the activator further comprises a proximal holding member arranged at a proximal position on the at least one activation leg, the distal holding member and the proximal holding member provided on the at least one activation leg for snap-fit with the activator holding member of the medicament container holder at two different positions longitudinally spaced apart from each other.

12. The medicament delivery device of claim 11 , further comprising a locking mechanism including a lever provided on the medicament container holder, wherein the lever is configured to prevent movement of the needle guard when the needle guard is in a proximal position after actuation of the medicament delivery device.

13. The medicament delivery device of claim 12 , wherein the lever includes a proximal portion, an opposite distal portion, and a pivot axis arranged between the proximal and distal portions, about which the lever pivots.

14. The medicament delivery device of claim 13 , wherein the distal portion of the lever is configured to be pressed inward by the activator when the activator is moved in the distal direction by the needle guard.

15. The medicament delivery device of claim 14 , wherein the distal portion of the lever is configured to be kept pressed inward by the activator when the needle guard is moved back to the proximal position after actuation of the medicament delivery device.

16. The medicament delivery device of claim 14 , wherein the activator holding member of the medicament container holder is configured to snap-fit to the proximal holding member when the activator is moved in the distal direction.

17. The medicament delivery device of claim 1 , wherein the drive comprises a plunger rod accommodated at least partly within the drive holder and a spring arranged within the plunger rod in a pre-tensioned state before delivery of the medicament.

Assignees

• Carebay Europe Ltd
• Shl Medical Ag

Inventors

• Holmqvist Anders

Classifications

• A61M5/31578

  based on axial translation, i.e. components directly operatively associated and axially moved with plunger rod · CPC title

• A61M5/24

  Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic {(ampoules or carpules A61J1/06)} · CPC title

• A61M2005/2013

  triggering of discharging means by contact of injector with patient body · CPC title

• A61M2005/2073

  preventing premature release, e.g. by making use of a safety lock · CPC title

• A61M5/31571 Primary

  Means preventing accidental administration (for automatic syringes A61M5/20) · CPC title