US 12,076,536 B2
Syringe plunger stopper for high dose accuracy drug delivery
Alfred W. Prais, Hewitt, NJ (US)
Assigned to Becton, Dickinson and Company, Franklin Lakes, NJ (US)
Appl. No. 16/957,971
Filed by Becton, Dickinson and Company, Franklin Lakes, NJ (US)
PCT Filed May 14, 2019, PCT No. PCT/US2019/032164
§ 371(c)(1), (2) Date Jun. 25, 2020,
PCT Pub. No. WO2019/222174, PCT Pub. Date Nov. 21, 2019.
Claims priority of provisional application 62/671,618, filed on May 15, 2018.
Prior Publication US 2020/0330690 A1, Oct. 22, 2020
Int. Cl. A61M 5/31 (2006.01); A61M 5/315 (2006.01)
CPC A61M 5/31513 (2013.01) [A61M 5/31545 (2013.01); A61M 2205/0216 (2013.01); A61M 2207/00 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A stopper adapted for attachment with a plunger rod for use within a syringe barrel for accurate dispensing of a fluid, the stopper comprising a first portion formed from a first material and a second portion formed from a second material, wherein the second material has a greater rigidity than the first material and wherein the second portion is configured to be attached to the plunger rod;
wherein the first portion comprises a cavity;
wherein the second portion comprises a tubular member having opposing open top and bottom ends, the tubular member positioned within the cavity of the first portion; and
wherein the tubular member comprises a C-shaped tubular member having an open portion that provides flexibility to the second portion for placement and retention within the cavity.