US 12,102,793 B2
System and method for syringe plunger engagement with an injector
Michael Swantner, Saxonburg, PA (US); Richard Seman, Delmont, PA (US); Barry Tucker, Verona, PA (US); Arthur Uber, III, Pittsburgh, PA (US); Kevin Cowan, Allison Park, PA (US); James Dedig, Pittsburgh, PA (US); Christopher Capone, Pittsburgh, PA (US); and Jaroslaw Wlodarczyk, Lower Burrell, PA (US)
Assigned to BAYER HEALTHCARE LLC, Whippany, NJ (US)
Filed by BAYER HEALTHCARE LLC, Whippany, NJ (US)
Filed on Jan. 6, 2023, as Appl. No. 18/093,946.
Application 18/093,946 is a continuation of application No. 16/714,980, filed on Dec. 16, 2019, granted, now 11,547,794.
Application 16/714,980 is a continuation of application No. 15/334,644, filed on Oct. 26, 2016, granted, now 10,512,721, issued on Dec. 24, 2019.
Application 15/334,644 is a continuation of application No. 14/925,722, filed on Oct. 28, 2015, granted, now 9,480,797, issued on Nov. 1, 2016.
Prior Publication US 2023/0149624 A1, May 18, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 5/145 (2006.01); A61M 5/315 (2006.01)
CPC A61M 5/14566 (2013.01) [A61M 5/31515 (2013.01); A61M 5/14546 (2013.01); A61M 2005/14573 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A piston for a powered fluid injector, the piston comprising:
a stem connected to a proximal portion of the piston; and
a piston head extending distally from the stem, wherein the piston head comprises:
a proximal portion having a first outer diameter;
a distal portion having a second outer diameter, wherein the first outer diameter is smaller compared to the second outer diameter;
a radial lip formed at a transition between the proximal portion and the distal portion, wherein the radial lip defines a locking ledge;
at least one alignment member protruding radially outward from an outer surface of the piston head, wherein the at least one alignment member is configured for interacting with a first alignment member of a plunger of a syringe; and
an actuation surface configured to interact with an actuation member of the plunger such that at least one retaining member of the plunger is deflected from the piston head to disengage the at least one retaining member from the locking ledge of the piston upon rotation of the plunger relative to the piston.