US 11,806,513 B2
Small unit dosage plunger rod stops
Steve Bowman, Lexington, MA (US); Chase Fetzer, Lexington, MA (US); Richard Braga, Lexington, MA (US); and Evi Shiakolas, Lexington, MA (US)
Assigned to TAKEDA PHARMACEUTICAL COMPANY LIMITED, Osaka (JP)
Filed by TAKEDA PHARMACEUTICAL COMPANY LIMITED, Osaka (JP)
Filed on May 13, 2021, as Appl. No. 17/319,331.
Application 17/319,331 is a continuation of application No. 15/804,439, filed on Nov. 6, 2017, granted, now 11,013,864.
Claims priority of provisional application 62/417,862, filed on Nov. 4, 2016.
Prior Publication US 2021/0275751 A1, Sep. 9, 2021
Int. Cl. A61M 5/315 (2006.01)
CPC A61M 5/31501 (2013.01) [A61M 5/31505 (2013.01); A61M 5/31515 (2013.01); A61M 5/31548 (2013.01); A61M 5/31578 (2013.01); A61M 5/31595 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of delivering a dosage of liquid from a syringe, the method comprising:
sliding a plunger rod stop laterally onto a proximal flange of a plunger rod of the syringe such that the proximal flange slides into a horizontal slot of the plunger rod stop and the plunger rod slides into a vertical recess of the plunger rod stop, the horizontal slot and the vertical recess forming a T-shaped receptacle formed into a cylindrical body of the plunger rod stop so as to accept the proximal flange and the plunger rod laterally;
depressing the plunger rod axially a first distance into a barrel of the syringe until a first standoff contacts a first fixed element of the syringe, the first standoff extending laterally from the cylindrical body and having a tapered portion;
rotating the plunger rod stop such that the first standoff is out of alignment with the first fixed element; and
depressing the plunger rod axially a second distance into the barrel of the syringe.