US 10,376,651 B2
Injection device
Anthony Paul Morris, Coventry (GB)
Assigned to Sanofi, Paris (FR)
Appl. No. 14/782,616
Filed by Sanofi, Paris (FR)
PCT Filed Apr. 8, 2014, PCT No. PCT/EP2014/056999
§ 371(c)(1), (2) Date Oct. 6, 2015,
PCT Pub. No. WO2014/166917, PCT Pub. Date Oct. 16, 2014.
Claims priority of application No. 13163106 (EP), filed on Apr. 10, 2013.
Prior Publication US 2016/0067419 A1, Mar. 10, 2016
Int. Cl. A61M 5/20 (2006.01); A61M 5/31 (2006.01); A61M 5/315 (2006.01)
CPC A61M 5/31551 (2013.01) [A61M 5/20 (2013.01); A61M 5/31528 (2013.01); A61M 5/31541 (2013.01); A61M 5/31553 (2013.01); A61M 5/31583 (2013.01); A61M 5/3157 (2013.01); A61M 2005/3126 (2013.01); A61M 2205/581 (2013.01); A61M 2205/582 (2013.01); A61M 2205/583 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A handheld spring-driven injection device comprising:
a housing;
a piston rod defining a first longitudinal axis, the piston rod being located within the housing;
a driver coupled to the piston rod;
a dose setting assembly which is rotatable during dose setting;
a power reservoir for driving the driver, wherein the power reservoir is a motor spring of the handheld spring-driven injection device, the motor spring being dimensioned such that the motor spring can drive the piston rod from a retracted position into a distal position; and
a number wheel for displaying a dose set by the dose setting assembly,
wherein the dose setting assembly comprises a dial grip, which comprises a threaded section having an end stop, and wherein the housing comprises a splined section, with a last dose nut being interposed between and engaging the threaded section of the dial grip and the splined section of the housing,
wherein the motor spring has a first end attached to a first spool, which is located on the first longitudinal axis, and a second end attached to a second spool, which is located on a second longitudinal axis, with one of the first and second spools being coupled to the driver.