US 10,376,645 B2
Drive mechanism for a drug delivery device
David Aubrey Plumptre, Worcestershire (GB); Naceur Rekaya, Warwickshire (GB); Paul Richard Draper, Worcestershire (GB); Paul Griffin, Worcestershire (GB); and David Richard Mercer, Dorset (GB)
Assigned to Sanofi-Aventis Deutschland GMBH, Frankfurt am Main (DE)
Appl. No. 14/770,848
Filed by SANOFI-AVENTIS DEUTSCHLAND GMBH, Frankfurt am Main (DE)
PCT Filed Mar. 10, 2014, PCT No. PCT/EP2014/054532
§ 371(c)(1), (2) Date Aug. 27, 2015,
PCT Pub. No. WO2014/139920, PCT Pub. Date Sep. 18, 2014.
Claims priority of application No. 13159054 (EP), filed on Mar. 13, 2013.
Prior Publication US 2016/0008548 A1, Jan. 14, 2016
Int. Cl. A61M 5/31 (2006.01); A61M 5/315 (2006.01)
CPC A61M 5/3146 (2013.01) [A61M 5/31571 (2013.01); A61M 5/31515 (2013.01); A61M 5/31551 (2013.01); A61M 5/31585 (2013.01); A61M 2207/00 (2013.01); A61M 2207/10 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A drive mechanism for a drug delivery device, the drive mechanism comprising:
a piston rod;
an adjusting member; and
a rotation preventing member,
wherein the drive mechanism has a first state in which the drive mechanism is operable to perform a priming operation and a second state in which the drive mechanism is operable to perform a dose setting operation and a dose dispensing operation,
wherein the adjusting member is rotatable relative to a body of the drug delivery device in the first state of the drive mechanism and is configured to be prevented from rotating relative to the body in the second state of the drive mechanism,
wherein the adjusting member is configured to adjust an axial position of the piston rod in the first state of the drive mechanism,
wherein the piston rod is configured to be moved in a distal direction when the drive mechanism is operated in its first state, and wherein the piston rod is moveable relative to the adjusting member in the second state of the drive mechanism,
wherein the adjusting member is configured to constrain a movement of the piston rod in the second state of the drive mechanism such that the piston rod is permitted only to carry out a concurrent axial and rotational movement relative to the adjusting member, and
wherein the rotation preventing member is configured to be engaged with the adjusting member in the second state of the drive mechanism, thereby preventing the adjusting member from rotating relative to the body.