US 11,701,472 B2
Syringe stopper and plunger rod arrangement for a syringe assembly
Kevin M. Ryan, Whitehouse Station, NJ (US)
Assigned to Becton, Dickinson and Company, Franklin Lakes, NJ (US)
Appl. No. 16/977,904
Filed by Becton, Dickinson and Company, Franklin Lakes, NJ (US)
PCT Filed Mar. 14, 2019, PCT No. PCT/US2019/022300
§ 371(c)(1), (2) Date Sep. 3, 2020,
PCT Pub. No. WO2019/182870, PCT Pub. Date Sep. 26, 2019.
Claims priority of provisional application 62/645,353, filed on Mar. 20, 2018.
Prior Publication US 2021/0038823 A1, Feb. 11, 2021
Int. Cl. A61M 5/315 (2006.01); A61M 5/31 (2006.01)
CPC A61M 5/31501 (2013.01) [A61M 5/3135 (2013.01); A61M 5/31513 (2013.01); A61M 2205/0216 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A syringe assembly, comprising:
a) a substantially cylindrical syringe barrel comprising a fluid dispensing end, an open end, and at least one protrusion adjacent the open end, the at least one protrusion projecting inwardly from an inner surface of the syringe barrel;
b) a stopper configured to be received within the open end of the syringe barrel; and
c) a plunger rod having a plunger rod body extending along a longitudinal axis from a proximal end to a distal end and at least one support disk provided on the distal end thereof,
wherein the at least one support disk on the plunger rod is configured to bear against the at least one protrusion of the syringe barrel upon misalignment of the plunger rod in the syringe barrel,
wherein the at least one support disk comprises a first support disk and a second support disk on the plunger rod spaced from one another such that, when the plunger rod is misaligned in the syringe barrel, the first support disk bears against a proximal side of at least one the protrusion at a first load bearing point and the second support disk bears against a distal side of the at least one protrusion at a second load bearing point.