US 12,280,242 B2
Multi-chamber syringe
Todd Oda, Torrance, CA (US); George Mansour, Diamond Bar, CA (US); and Eugene Mason, La Habra Heights, CA (US)
Assigned to CAREFUSION 303, INC., San Diego, CA (US)
Filed by CareFusion 303, Inc., San Diego, CA (US)
Filed on Sep. 14, 2022, as Appl. No. 17/944,321.
Application 17/944,321 is a continuation of application No. 16/403,399, filed on May 3, 2019, granted, now 11,478,584.
Prior Publication US 2023/0001092 A1, Jan. 5, 2023
Int. Cl. A61M 5/19 (2006.01); A61M 5/14 (2006.01); A61M 5/31 (2006.01); A61M 5/315 (2006.01); A61M 5/178 (2006.01); A61M 39/24 (2006.01)
CPC A61M 5/19 (2013.01) [A61M 5/1409 (2013.01); A61M 5/3146 (2013.01); A61M 5/31596 (2013.01); A61M 2005/1787 (2013.01); A61M 2005/3114 (2013.01); A61M 5/31513 (2013.01); A61M 2005/31598 (2013.01); A61M 39/24 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method to deliver saline into a syringe, the method comprising:
receiving the saline from a return flow path of a tubing in an inner tube of the syringe;
directing the saline from the inner tube to an annulus of the syringe, wherein the inner tube and a medication plunger shaft lumen define the annulus therebetween; and
directing the saline from the annulus to a saline chamber of the syringe.
 
7. A method to deliver medication, the method comprising:
advancing a saline plunger to urge saline disposed in a saline chamber through a channel formed through a medication plunger and through a medication flow path of a tubing;
receiving the saline from a return flow path of the tubing in an inner tube of a syringe;
advancing the medication plunger to urge the medication disposed in a medication chamber of the syringe through the medication flow path of the tubing after the receiving the saline from the return flow path of the tubing;
directing the saline from the inner tube to an annulus of the syringe, wherein the inner tube and a medication plunger shaft lumen define the annulus therebetween; and
directing the saline from the annulus to the saline chamber of the syringe.
 
10. A method to deliver medication, the method comprising:
advancing a medication plunger a predetermined distance to urge the medication disposed in a medication chamber of a syringe through a medication flow path of a tubing to prime the medication flow path;
receiving saline from a return flow path of the tubing in an inner tube of the syringe after the advancing the medication plunger; and
directing the saline from the inner tube to an annulus of the syringe, wherein the inner tube and a medication plunger shaft lumen define the annulus therebetween.