US 12,064,603 B2
System and method for safety syringe
Jeff Tillack, Foster City, CA (US); Alan E. Shluzas, San Carlos, CA (US); Stephen H. Diaz, Palo Alto, CA (US); Gary Steese-Bradley, San Jose, CA (US); John Merhige, Menlo Park, CA (US); Conor Edward Shanley, Emerald Hills, CA (US); and Mina M. Leung, Mountain View, CA (US)
Assigned to Credence MedSystems, Inc., Menlo Park, CA (US)
Filed by CREDENCE MEDSYSTEMS, INC., Menlo Park, CA (US)
Filed on Dec. 30, 2022, as Appl. No. 18/091,959.
Application 18/091,959 is a continuation of application No. 16/798,188, filed on Feb. 21, 2020, granted, now 11,541,179.
Claims priority of provisional application 62/864,509, filed on Jun. 21, 2019.
Claims priority of provisional application 62/809,369, filed on Feb. 22, 2019.
Prior Publication US 2023/0147715 A1, May 11, 2023
Int. Cl. A61M 5/24 (2006.01); A61M 5/178 (2006.01); A61M 5/20 (2006.01); A61M 5/28 (2006.01); A61M 5/31 (2006.01)
CPC A61M 5/2448 (2013.01) [A61M 5/2066 (2013.01); A61M 5/284 (2013.01); A61M 2005/1787 (2013.01); A61M 2005/3132 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An injection system, comprising:
a syringe body defining a proximal opening at a proximal end thereof and a distal needle interface at a distal end thereof;
proximal and distal stopper members disposed in the syringe body, forming a proximal drug chamber between the proximal and distal stopper members and a distal drug chamber between the distal stopper member and the distal end of the syringe body;
a plunger member configured to be manually manipulated to insert the proximal stopper member relative to the syringe body, wherein the plunger member has a smooth exterior surface;
a fluid conveying assembly; and
a finger flange comprising an anti-retraction mechanism, the anti-retraction mechanism having:
a brake tab configured to provide an opposing force to the plunger member to prevent proximal movement thereof relative to the brake tab, and
a retention feature configured to maintain the anti-retraction mechanism in a recess in the finger flange,
wherein the finger flange further comprises an opening having an edge configured to interfere with and retain the anti-retraction mechanism in the recess.