US 12,233,245 B2
Shock absorber for injection devices
Uwe Dasbach, Frankfurt am Main (DE); Hugo Revellat, Herts (GB); Robbie Wilson, Herts (GB); Jim Bradford, Herts (GB); Thomas Kemp, Herts (GB); William Timmis, Herts (GB); and Andrew Labat-Rochccouste, Herts (GB)
Assigned to Sanofi, Paris (FR)
Appl. No. 17/048,007
Filed by SANOFI, Paris (FR)
PCT Filed Apr. 18, 2019, PCT No. PCT/EP2019/060198
§ 371(c)(1), (2) Date Oct. 15, 2020,
PCT Pub. No. WO2019/202130, PCT Pub. Date Oct. 24, 2019.
Claims priority of application No. 18305479 (EP), filed on Apr. 19, 2018.
Prior Publication US 2021/0113775 A1, Apr. 22, 2021
Int. Cl. A61M 5/315 (2006.01); A61M 5/24 (2006.01); A61M 5/31 (2006.01)
CPC A61M 5/31501 (2013.01) [A61M 5/24 (2013.01); A61M 2005/2477 (2013.01); A61M 2005/3143 (2013.01); A61M 2005/31508 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An injection device comprising:
a medicament container;
a stopper translatably disposed within the medicament container; and
a plunger rod comprising:
a plunger rod body comprising two or more deflectable arms, each deflectable arm comprising one or more engaging teeth, and the two or more deflectable arms being integral to the plunger rod body; and
a shock absorber comprising a retractable tip (i) collapsible into the plunger rod body and (ii) comprising two or more toothed beams, each toothed beam comprising a plurality of teeth engageable with the one or more engaging teeth of the two or more deflectable arms of the plunger rod body,
wherein the plunger rod is operable to displace the stopper; and
wherein the shock absorber is configured to contact the stopper such that, during displacement of the stopper by the plunger rod, the plurality of teeth of the two or more toothed beams of the shock absorber engage with the one or more engaging teeth of the two or more deflectable arms to deflect the deflectable arm, thereby reducing an impact force between the plunger rod and the stopper.