ASSEMBLY FOR A DRUG DELIVERY DEVICE AND DRUG DELIVERY DEVICE

• US 20160317749A1
• Filed: 12/18/2014
• Published: 11/03/2016
• Est. Priority Date: 12/20/2013
• Status: Abandoned Application

• Current Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Original Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Inventors: Jugl, Michael, Teucher, Axel, Holtwick, Marc
• Application Number:
  US15/105,251
• Publication Number:
  US 20160317749A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61M 2005/2086 having piston damping means, e.g. axially or rotationally acting retarders
• CPC Class Codes: A61M 2005/3151 by friction
• CPC Class Codes: A61M 2005/3152 including gearings to multiply or attenuate the piston displacing force
• CPC Class Codes: A61M 5/20 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 Class Codes: A61M 5/2033 Spring-loaded one-shot injectors with or without automatic needle insertion multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287
• CPC Class Codes: A61M 5/31501 Means for blocking or restricting the movement of the rod or piston A61M5/5013 takes precedence
• CPC Class Codes: A61M 5/31511 Piston or piston-rod constructions, e.g. connection of piston with piston-rod A61M5/5066 takes precedence
• CPC Class Codes: A61M 5/31513 Piston constructions to improve sealing or sliding
• CPC Class Codes: A61M 5/31553 without axial movement of dose setting member
• CPC Class Codes: A61M 5/31583 based on rotational translation, i.e. movement of piston rod is caused by relative rotation between the user activated actuator and the piston rod

Abstract

An assembly for a drug delivery device (1) is described comprising a piston rod (12) adapted and arranged to be displaceable in a delivery direction for dispensing a dose of a drug (10) from the device (1), an energy storing member (16) which is adapted and arranged to store energy and to move the piston rod (12) in the delivery direction, and an interaction member (7) adapted and arranged to mechanically cooperate with the piston rod (12), wherein the interaction member (7) is displaceable between a first position and a second position with respect to the piston rod (12), wherein the interaction member (7) is configured to be moved from the first position towards the second position to increase a friction onto the piston rod (12) and, wherein the interaction member (7) is configured to be moved from the second position back into the first position to decrease the friction onto the piston rod (12). Furthermore, a drug delivery device (1) comprising the assembly is described.

Claims

1. An assembly for a drug delivery device (1) comprising

a piston rod (12) adapted and arranged to be displaceable in a delivery direction for dispensing a dose of a drug (10) from the device (1),

an energy storing member (16) which is adapted and arranged to store energy and to move the piston rod (12) in the delivery direction,

an interaction member (7) adapted and arranged to mechanically cooperate with the piston rod (12), wherein the interaction member (7) is displaceable between a first position and a second position with respect to the piston rod (12), wherein the interaction member (7) is configured to be moved from the first position towards the second position to increase a friction onto the piston rod (12) and, wherein the interaction member (7) is configured to be moved from the second position back into the first position to decrease the friction onto the piston rod (12).

2. The assembly according to claim 1,

wherein, when the interaction member (7) is positioned in the first position, the piston rod (12) is displaceable in the delivery direction at a first speed and, when the interaction member (7) is moved towards the second position, the interation member (7) generates a force onto the piston rod (12), the piston rod (12) being displaceable in the delivery direction at a second speed, wherein the second speed is smaller than the first speed.

3. The assembly according to any of the previous claims,

wherein the interaction member (7) comprises a first portion (18) and a second portion (17), wherein the first portion (18) is arranged around the piston rod (12) and, wherein the second portion (17) is configured to be operated by the user.

4. The assembly according to claim 3,

further comprising a housing (5), wherein the housing (5) comprises an opening (5A) and, wherein the second portion (17) is adapted and arranged to extend through the opening (5A) of the housing (5).

5. The assembly according to claim 3 or claim 4,

wherein the second portion (17) is biased towards the first position or towards the second position.

6. The assembly according to any of claims 3 to 5,

wherein the piston rod (12) is in direct mechanical contact with the first portion (18) at least when the interation member (7) is arranged in the second position.

7. The assembly according to any of the previous claims,

wherein, for moving the interaction member from the first position into the second position, the interaction member (7) is tiltable about an axis (22) which is perpendicular to an axis (21) along which the piston rod (12) is moved during a dose delivery operation.

8. The assembly according to any of the previous claims,

wherein the interaction member (7) comprises an opening (7A), wherein, the piston rod (12) is guided through the opening (7A), and wherein, when the interaction member (7) is arranged in the first position, a surface normal (25) of the opening (7A) is parallel to the axis (22) which is perpendicular to the axis (21) along which the piston rod (12) is moved during a dose delivery operation.

9. The assembly according to claim 8,

wherein, when the interaction member (7) is arranged in the second position, the surface normal (25) of the opening (7A) is arranged at an angle (α

) with respect to the axis (22) which is perpendicular to the axis (21) along which the piston rod (12) is moved during a dose delivery operation.

10. The assembly according to claim 9,

wherein an amount of friction onto the piston rod (12) depends on the size of the angle (a) between the surface normal (25) of the opening (7A) and the axis (22) perpendicular to the axis (21) along which the piston rod (12) is moved during a dose delivery operation.

11. The assembly according to any of claims 1 to 6,

further comprising a guide member (14), wherein the guide member (14) is adapted and arranged to mechanically cooperate with the piston rod (12) to guide movement of the piston rod in the delivery direction, wherein, when the interaction member (7) is positioned in the first position, it has a predetermined first distance with respect to the guide member (14).

12. The assembly according to claim 11,

wherein, when the interation member (7) is moved from the first position into the second position, the interaction member (7) is rotated by an angle towards the guide member (14) along the axis (21) along which the piston rod (12) is moved during a dose delivery operation such that the interaction member (7) is arranged at a second distance with respect to the guide member (14) when the interaction member (7) is positioned in the second position.

13. The assembly according to claim 11 or claim 12,

wherein, when the interaction member (7) is arranged in the second position, the interaction member (7) abuts the guide member (14) to increase the friction.

14. The assembly according to claim 12 or claim 13,

wherein an amount of friction onto the piston rod (12) depends on the angle by which the interaction member (7) is rotated towards the guide member (14).

15. A drug delivery device comprising the assembly according to any of the previous claims,

wherein the drug delivery device (1) further comprises a cartridge (3) for holding a plurality of doses of the drug (10) and an activation member (6A) adapted and arranged to be operated by a user for triggering a dose delivery operation of the assembly, wherein the energy storing member (16) is adapted and arranged to move the piston rod (12) in the delivery direction when the activation member (16) is operated by the user.