US 12,290,669 B2
Dual chamber syringe with retractable needle
Ivan Zivkovic, Mahwah, NJ (US); Jorgen Hager, Helsingborg (SE); Ulf Handberg, Upplands Vasby (SE); Gert Hanner, Hoganas-Mjohult (SE); Thomas Holma, Svangsta (SE); and Ulf Wahlberg, Helsingborg (SE)
Assigned to Becton, Dickinson and Company, Franklin Lakes, NJ (US)
Filed by Becton, Dickinson and Company, Franklin Lakes, NJ (US)
Filed on Jul. 27, 2022, as Appl. No. 17/874,955.
Application 17/874,955 is a division of application No. 16/778,940, filed on Jan. 31, 2020, granted, now 11,426,533.
Application 16/778,940 is a division of application No. 15/378,677, filed on Dec. 14, 2016, granted, now 10,549,050, issued on Feb. 4, 2020.
Application 15/378,677 is a division of application No. 13/187,200, filed on Jul. 20, 2011, granted, now 9,550,030, issued on Jan. 24, 2017.
Claims priority of provisional application 61/366,874, filed on Jul. 22, 2010.
Prior Publication US 2022/0355043 A1, Nov. 10, 2022
Int. Cl. A61M 5/32 (2006.01); A61M 5/19 (2006.01); A61M 5/31 (2006.01); A61M 5/50 (2006.01); A61M 5/34 (2006.01)
CPC A61M 5/3232 (2013.01) [A61M 5/19 (2013.01); A61M 5/3137 (2013.01); A61M 5/3213 (2013.01); A61M 5/3221 (2013.01); A61M 5/3276 (2013.01); A61M 5/502 (2013.01); A61M 5/508 (2013.01); A61M 2005/3139 (2013.01); A61M 2005/3227 (2013.01); A61M 5/347 (2013.01); A61M 2005/5033 (2013.01); A61M 2205/582 (2013.01); A61M 2205/583 (2013.01); A61M 2205/586 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A syringe assembly comprising:
a fluid barrel including a sidewall having an inside surface defining a fluid chamber for retaining fluid and having a first cross-sectional width, an open proximal end and a distal end including a distal wall;
a plunger rod disposed within the fluid chamber comprising a distal end, a proximal end, a plunger rod body extending from the distal end of the plunger rod to the proximal end of the plunger rod, and a stopper disposed at the distal end of the plunger rod for forming a fluid-tight seal with the inside surface of the fluid barrel;
a retraction barrel disposed adjacent to the sidewall of the fluid barrel, the retraction barrel including a wall having an interior surface defining a needle chamber, an open proximal end, an open distal end including a barrier wall, an aperture between the wall of the retraction barrel and the sidewall of the fluid barrel permitting fluid communication between the fluid chamber and the needle chamber and a needle hub assembly comprising a needle hub, a needle cannula attached to the needle hub, the needle cannula being in fluid communication with the aperture and biased to move in a proximal direction; and
a trigger element disposed within the needle chamber and moveable within the retraction barrel independently from the plunger rod, the trigger element including a distal end and a proximal end, and a trigger element body that extends from the distal end of the trigger element to the proximal end of the trigger element, the trigger element providing a trigger force causing the needle cannula to retract into the retraction barrel, and a snap element disposed adjacent to the proximal end of the trigger element, the snap element including an angled surface, the snap element including a distal end and a proximal end; the angled surface of the snap element is configured to engage the retraction barrel for preventing distal movement of the trigger element, wherein the angled surface of the snap element has a height that increases from the proximal end of the snap element to the distal end of the snap element to permit or facilitate movement of the plunger rod past the snap element; the plunger rod includes a contacting surface as a flat radial ring that deflects the snap element allowing the trigger element to be moved in the distal direction to allow the retraction of the needle cannula.