Medicament delivery device

Patent metadata

Field	Value
Publication number	US-11246987-B2
Application number	US-201716093847-A
Country	US
Kind code	B2
Filing date	Apr 27, 2017
Priority date	Apr 27, 2016
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

A medicament delivery device (100) for a delivery of a medicament from a container (12) through a cannula (16). The device comprises a chassis (300), a carriage (200), and an insertion spring (70) for biasing the carriage (200) for movement in an insertion direction with respect to the chassis (300) from a starting position in which the cannula (16) is shrouded to an insertion position in which the cannula (16) is extended. A drive mechanism (400) is provided for driving a stopper (22) of the container (12) to expel the medicament. The drive mechanism (400) is carriage by the carriage (200) and comprises a movable drive member (404), a drive means (40) for applying a driving force to the drive member (404), and a force transmission means (406) for transmitting the driving force to the stopper (22). The drive means (40) is arranged around or alongside at least part of the force transmission means (406).

First claim

The invention claimed is:

1. A medicament delivery device for a delivery of a medicament from a container through a cannula, the container having a stopper for containing the medicament within the container, the device comprising:
a chassis;
a carriage for retaining the container and the cannula;
an insertion spring for biasing the carriage for movement in an insertion direction with respect to the chassis from a starting position in which the cannula is shrouded to an insertion position in which the cannula is extended; and
a drive mechanism for driving the stopper along a container axis to expel the medicament through the cannula upon activation of the drive mechanism;
wherein the drive mechanism is carried by the carriage and comprises a drive member that is movable with respect to the carriage, a drive means for applying a driving force to the drive member along a drive axis, and a force transmission means comprising a non-deformable element for transmitting the driving force from the drive member to the stopper; and
wherein the drive means comprises a tension spring, wherein the tension spring circumferentially surrounds the non-deformable element.

2. The medicament delivery device according to claim 1 , wherein the drive means comprises a first end coupled to the drive member and a second end coupled to the carriage, and wherein the force transmission means is disposed at least partly between the first end and the second ends of the drive means.

3. The medicament delivery device according to claim 1 , wherein the drive axis is parallel to and spaced from the container axis.

4. The medicament delivery device according to claim 3 , wherein the drive means is disposed alongside the container.

5. The medicament delivery device according to claim 1 , wherein the force transmission means comprises an array of balls.

6. The medicament delivery device according to claim 1 , wherein a first end of the force transmission means is aligned with the drive axis, and wherein a second end of the force transmission means is aligned with the container axis.

7. The medicament delivery device according to claim 1 , wherein a part of the force transmission means is received or receivable in the container.

8. The medicament delivery device according to claim 1 , wherein the force transmission means is guided in a guide track associated with the carriage.

9. The medicament delivery device according to claim 1 , wherein the drive mechanism comprises a guide element for guiding movement of the drive member along the drive axis, and wherein the tension spring is arranged concentrically around the guide element.

10. The medicament delivery device according to claim 9 , wherein
the force transmission means is guided in a guide track associated with the carriage; and
the guide track is defined in part by the guide element.

11. The medicament delivery device according to claim 9 , wherein the guide element is generally tubular.

12. The medicament delivery device according to claim 11 , wherein the drive member comprises a guide formation for cooperation with a slot in the guide element to prevent turning movement of the drive member.

13. The medicament delivery device according to claim 1 , further comprising a shock absorber disposed between the drive member and the stopper.

14. The medicament delivery device according to claim 1 , wherein the drive mechanism is activated in response to the carriage reaching an activation position during the movement of the carriage towards the insertion position.

15. The medicament delivery device according to claim 14 , comprising a drive trigger for activating the drive mechanism when the carriage reaches the activation position.

16. The medicament delivery device according to claim 15 , wherein the drive trigger is associated with the chassis.

17. The medicament delivery device according to claim 15 , wherein the drive mechanism comprises a drive latch for latching the drive member in an initial position, and wherein the drive trigger is arranged to cooperate with the drive latch when the carriage reaches the activation position to release the drive member for movement along the drive axis.

18. The medicament delivery device according to claim 17 , comprising a latch stop associated with the carriage and wherein the drive latch is arranged to engage with the latch stop to hold the drive member in the initial position.

19. The medicament delivery device according to claim 18 , comprising a spring means for biasing the drive latch into engagement with the latch stop.

20. The medicament delivery device according to claim 1 , comprising a carriage latch arrangement for holding the carriage in the starting position and for allowing the movement of the carriage in the insertion direction under a bias of the insertion spring upon release of the carriage latch arrangement.

21. The medicament delivery device according to claim 20 , comprising a trigger component operable to release the carriage latch arrangement.

22. The medicament delivery device according to claim 21 , comprising an interlock member and an interlock spring for biasing the interlock member and the chassis apart, wherein the interlock member is movable with respect to the chassis against a bias of the interlock spring to switch the device from a neutral state in which release of the carriage latch arrangement is not possible to a ready state in which the trigger component is operable to release the carriage latch arrangement.

23. The medicament delivery device according to claim 22 , wherein the interlock member comprises a housing body for retaining the trigger component.

24. The medicament delivery device according to claim 1 , wherein the insertion spring is disposed parallel to and spaced from both the drive axis and the container axis.

25. The medicament delivery device according to claim 1 , wherein the insertion spring comprises a tension spring.

26. The medicament delivery device according to claim 25 , further comprising a coupling mechanism for releasably coupling the insertion spring to the carriage, wherein the drive mechanism is arranged to activate the coupling mechanism to cause decoupling of the insertion spring from the carriage after delivery of the medicament, thereby to allow movement of the carriage away from the insertion position.

27. The medicament delivery device according to claim 1 , further comprising a retraction spring for driving movement of the carriage away from the insertion position to retract the cannula after delivery of the medicament.

Assignees

• Owen Mumford Ltd

Inventors

• Cowe Toby
• Mallon Jake

Classifications

• A61M2005/31518

  designed to reduce the overall size of an injection device, e.g. using flexible or pivotally connected chain-like rod members · CPC title

• A61M5/3159

  Dose expelling manners · CPC title

• A61M5/2459

  upon internal pressure increase, e.g. pierced or burst (A61M5/2429 takes precedence) · CPC title

• A61M2005/2006

  Having specific accessories · CPC title

• A61M2005/3152

  including gearings to multiply or attenuate the piston displacing force · CPC title