Drive Mechanism for a Drug Delivery Device

Patent metadata

Field	Value
Publication number	US-2016144121-A1
Application number	US-201414905222-A
Country	US
Kind code	A1
Filing date	Jul 17, 2014
Priority date	Jul 17, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

A drive mechanism for a delivery device or a positioning mechanism comprising a rod ( 5 ), a rotatable cam member ( 9 ), and a follower member ( 6 ) being coupled to the cam member ( 9 ) in such a manner that a rotation of the cam member ( 9 ) is transferred to a reciprocating movement of the follower member ( 6 ) or a part thereof ( 7 ), the follower member ( 6 ) being coupled to the rod ( 5 ) via a ratchet mechanism ( 62, 64 ) in such a manner that the reciprocating movement of the follower member ( 6 ) or the part thereof ( 7 ) drives the rod ( 5 ).

First claim

1 . A drive mechanism for a delivery device or a positioning mechanism comprising a rod ( 5 ), a rotatable cam member ( 9 ), and a follower member ( 6 ) being coupled to the cam member ( 9 ) in such a manner that a rotation of the cam member ( 9 ) is transferred to a reciprocating movement of the follower member ( 6 ) or a part thereof ( 7 ), the follower member ( 6 ) being coupled to the rod ( 5 ) via a ratchet mechanism ( 62 , 64 ) in such a manner that the reciprocating movement of the follower member ( 6 ) or the part thereof ( 7 ) drives the rod ( 5 ).

2 . The drive mechanism according to claim 1 , wherein the rotatable cam member ( 9 ) is in contact with the follower member ( 6 ), which or part thereof is movable in a reciprocating manner.

3 . The drive mechanism according to claim 1 or 2 ,
wherein the rod ( 5 ) comprises a toothed rack ( 62 ) and the follower member ( 6 ) comprises a driving pawl ( 64 ), the driving pawl ( 64 ) and the toothed rack ( 62 ) being coupled in such a manner that the reciprocating movement of the driving pawl ( 64 ) drives the rod ( 5 ).

4 . The drive mechanism according to claim according to claim 3 ,
wherein the rod ( 5 ) comprising the toothed rack ( 62 ) and the follower member ( 6 ) comprising the driving pawl ( 64 ) are coupled in such a way that when the driving pawl ( 64 ) is moved proximally with respect to the toothed rack ( 62 ), the driving pawl ( 64 ) slides over the teeth of the rack ( 62 ); when the driving pawl ( 62 ) is moved distally with respect to the rack ( 62 ), the driving pawl ( 64 ) is locked against the teeth and relative movement of the driving pawl ( 64 ) and the rack ( 62 ) is prevented.

5 . The drive mechanism according to any of the previous claims,
wherein the cam member ( 9 ) is a disc having a face cam that comprises at least one protrusion ( 14 ) arranged on a face side of the cam member ( 9 ).

6 . The drive mechanism according to claim 5 ,
wherein the face cam comprises at a plurality of protrusions ( 14 ) arranged in a circle.

7 . The drive mechanism according to any of the previous claims,
wherein the follower member ( 6 ) comprises a moveable lever ( 7 ) arranged angularly with respect to the rod ( 5 ).

8 . The drive mechanism according to claim 7 ,
wherein the lever ( 7 ) comprises a contact section ( 15 ) abutting the face cam.

9 . The drive mechanism according to any of the claims 3 to 8 ,
further comprising a backlash pawl ( 66 ) being coupled to the toothed rack ( 62 ) in such a manner that a proximal movement of the rod ( 5 ) is prevented.

10 . The drive mechanism according to any of the previous claims,
further comprising a deflectable spring element ( 16 ) being releasably or non-releasably coupled to the cam member ( 9 ) in such a manner that the elastic force of the deflected spring element ( 16 ) drives the cam member ( 9 ).

11 . The drive mechanism according to claim 10 ,
further comprising a toothed rack member ( 10 ) coupled with the spring element ( 16 ) in such a manner that a movement of the toothed rack member ( 10 ) to a first direction deflects the spring element ( 16 ) and that the elastic force of the deflected spring element ( 16 ) moves the toothed rack member ( 10 ) to a second direction.

12 . The drive mechanism according to claim 11 ,
further comprising a gear box ( 11 ) that transfers the movement of the toothed rack member ( 10 ) into the second direction to the rotation of the cam member ( 9 ); the gear box ( 11 ) being decoupled from the cam member ( 9 ) when the toothed rack member ( 10 ) moves into the first direction.

13 . The drive mechanism according to claim 12 ,
wherein the gear box ( 11 ) comprises a pinion ( 12 ) that can be coupled via bevel gears ( 22 , 26 , 28 , 30 ) to the cam member ( 9 ).

14 . The drive mechanism according to claim 13 ,
further comprising a scroll wheel ( 20 ) coupled to the spring element ( 16 ) is such a manner that rotation of the scroll wheel ( 20 ) deflects the spring element ( 16 ).

15 . The drive mechanism according to claim 14 ,
wherein the scroll wheel ( 20 ) is coupled by a belt gear ( 43 , 71 , 72 , 13 ) to the pinion ( 12 ).

16 . The drive mechanism according to any of the claims 12 to 15 ,
further comprising a button member ( 50 ) being suitable for initiating coupling the gear box ( 11 ) and the cam member ( 90 ).

17 . The drive mechanism according to any of the previous claims,
used in a drug delivery device.

Assignees

• Sanofi Sa

Inventors

• Oakley Tom
• Schumann Matt
• Milne Stuart

Classifications

• A61M5/31578 Primary

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

• A61M5/31551

  including axial movement of dose setting member · CPC title

• A61M5/3155 Primary

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

• A61M2205/582

  by tactile feedback · CPC title

• A61M2205/583

  by visual feedback · CPC title