Assembly for a drug delivery device and drug delivery device

Patent metadata

Field	Value
Publication number	US-9623185-B2
Application number	US-201113701969-A
Country	US
Kind code	B2
Filing date	Jun 9, 2011
Priority date	Jun 11, 2010
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

An assembly for a drug delivery device is provided, comprising a housing, a rotation member adapted and arranged to be rotated in a first and in a second rotational direction with respect to the housing in an operational mode of the assembly, a drive member which is configured to mechanically cooperate with the rotation member such that the drive member follows rotation of the rotation member when the rotation member is rotated in the second rotational direction and such that the rotation member rotates with respect to the drive member when the rotation member is rotated in the first rotational direction, and a piston rod. The assembly further comprises at least one biasing member which is adapted and arranged to provide a force tending to bring the rotation member and the drive member out of mechanical cooperation in the operational mode. The assembly is switchable from the operational mode into a reset mode. For switching from the operational mode into the reset mode, the biasing member is configured to drive a relative axial movement between the drive member and the rotation member such that the rotation member and the drive member are brought out of mechanical cooperation. Furthermore, a drug delivery device is provided.

First claim

The invention claimed is:

1. An assembly for a drug delivery device, comprising:
a housing having a distal end and a proximal end,
a rotation member adapted and arranged to be rotated in a first rotational direction and in a second rotational direction with respect to the housing in an operational mode of the assembly,
a drive member which is configured to mechanically cooperate with the rotation member such that the drive member follows rotation of the rotation member when the rotation member is rotated in the second rotational direction and such that the rotation member rotates with respect to the drive member when the rotation member is rotated in the first rotational direction,
a piston rod configured to engage the drive member, the piston rod being adapted and arranged to be driven in the distal direction with respect to the housing when the drive member is rotated in the second rotational direction,
at least one biasing member which is adapted and arranged to provide a force tending to bring the rotation member and the drive member out of mechanical cooperation in the operational mode,
wherein the assembly is switchable from the operational mode into a reset mode, and wherein, for switching from the operational mode into the reset mode, the biasing member is configured to drive a relative axial movement between the drive member and the rotation member such that the rotation member and the drive member are brought out of mechanical cooperation.

2. The assembly according to claim 1 , comprising a stop member, the drive member and the stop member being coupled to one another by a uni-directional friction clutch mechanism in the operational mode such that rotation of the drive member in the first rotational direction with respect to the stop member is prevented and such that rotational movement of the drive member in the second rotational direction with respect to the stop member is permitted.

3. The assembly according to claim 2 , wherein the stop member is rotationally locked to the housing in the operational mode and in the reset mode, and wherein the stop member is axially displaceable with respect to the housing.

4. The assembly according to claim 2 , comprising a reset member which is adapted and arranged to be moved with respect to the housing between an operating position and a reset position, wherein, when the reset member is in the operating position, the drive member mechanically cooperates with the stop member and the rotation member, and wherein, when the reset member is in the reset position, the drive member is prevented from mechanical cooperation with the stop member and the rotation member, and wherein the drive member is rotatable in the first rotational direction with respect to the housing.

5. The assembly according to claim 4 , comprising a resilient reset member, wherein, in the operational mode, the resilient reset member is configured to be biased thereby tending to move the reset member from the operating position into the reset position and, wherein, when the assembly is switched from the operational mode into the reset mode, the resilient reset member is permitted to relax, thereby moving the reset member from the operating position into the reset position.

6. The assembly according to claim 4 , wherein the stop member and the reset member are configured to mechanically cooperate with one another such that the stop member follows movement of the reset member towards the reset position, thereby being brought out of mechanical cooperation with the drive member.

7. The assembly according to claim 2 , comprising a resilient operating member which is adapted and arranged to exert a force onto one, two or all of the drive member, the stop member and the rotation member, which force keeps the drive member in permanent mechanical cooperation with the stop member and the rotation member in the operational mode.

8. The assembly according to claim 5 , comprising a resilient operating member which is adapted and arranged to exert a force onto one, two or all of the drive member, the stop member and the rotation member, which force keeps the drive member in permanent mechanical cooperation with the stop member and the rotation member in the operational mode, wherein the resilient reset member is a reset spring member, the biasing member is a biasing spring member and the resilient operating member is an operating spring member, wherein the spring strength of the reset spring member is greater than the spring strength of the operating spring member and, wherein the spring strength of the operating spring member is greater than the spring strength of the biasing spring member.

9. The assembly according to claim 8 , wherein the spring strength of the biasing spring member is great enough to achieve a relative movement between the rotation member and the drive member to bring said members out of mechanical cooperation.

10. The assembly according to claim 1 , wherein the drive member and the piston rod are rotationally locked with each other.

11. The assembly according to claim 4 , wherein, in the reset mode, the stop member is secured to the housing by means of a releasable connection such that the stop member is prevented from axial movement in the proximal direction with respect to the reset member and with respect to the drive member.

12. The assembly according to claim 5 , comprising a trigger member releasably connectable to the housing, wherein, when the trigger member is connected to the housing, the trigger member is arranged to prevent the resilient reset member from relaxing, and wherein, when the trigger member is disconnected from the housing the assembly is switched from the operational mode into the reset mode.

13. The assembly according to claim 11 , wherein the housing comprises a guide track which is adapted and arranged to mechanically cooperate with a trigger member to guide movement of the trigger member with respect to the housing when the trigger member is connected to or disconnected from the housing, the guide track comprising a first section and a second section, the proximal end of the first section defining a proximal end position for the trigger member with respect to the housing and the second section extending in an angular direction,
wherein, when movement of the trigger member is guided by the first section in the reset mode, mechanical cooperation between the stop member and the trigger member is prevented,
and wherein, when movement of the trigger member is guided by the second section in the reset mode, the trigger member and the stop member are permitted to mechanically cooperate to release the connection of the stop member to the housing for switching the assembly into the operational mode such that the stop member is arranged to prevent rotation of the drive member in the first rotational direction, thereby preventing movement of the piston rod with respect to the housing during dose setting.

14. The assembly according to claim 7 , wherein, when the assembly is in the reset mode, energy is stored in the resilient operating member to drive movement of the stop member to switch the assembly into the operational mode.

15. A drug delivery device comprising the assembly according to claim 1 and a cartridge, the cartridge holding a plurality of doses of a drug, wherein the drug delivery device is a pen-type fixed dose device.

16. An assembly for a drug delivery device, comprising:
a housing having a distal end and a proximal end,
a rotation member adapted and arranged to be rotated in a first rotational direction and in a second rotational direction with respec

Assignees

• Raab Steffen
• Horlock Mark Philip
• Butler Stephen David
• Sanofi Aventis Deutschland

Inventors

• Raab Steffen
• Horlock Mark Philip
• Butler Stephen David

Classifications

• A61M5/31555

  by purely axial movement of dose setting member, e.g. during setting or filling of a syringe · CPC title

• A61M5/31543

  piston rod reset means, i.e. means for causing or facilitating retraction of piston rod to its starting position during cartridge change · CPC title

• A61M5/3158

  performed by axially moving actuator operated by user, e.g. an injection button · CPC title

• A61M5/31585

  performed by axially moving actuator, e.g. an injection button · CPC title

• A61M5/3155

  by rotational movement of dose setting member, e.g. during setting or filling of a syringe · CPC title