US 12,168,117 B2
Sequenced syringe assembly
Todd Oda, Torrance, CA (US); George Mansour, Diamond Bar, CA (US); Eugene Mason, La Habra Heights, CA (US); Tomas Frausto, Walnut, CA (US); and Dylan Beyhl, Scottsdale, AZ (US)
Assigned to CareFusion 303, Inc., San Diego, CA (US)
Filed by CareFusion 303, Inc., San Diego, CA (US)
Filed on Oct. 24, 2022, as Appl. No. 17/972,018.
Application 17/972,018 is a division of application No. 16/572,379, filed on Sep. 16, 2019, granted, now 11,511,044.
Prior Publication US 2023/0048849 A1, Feb. 16, 2023
Int. Cl. A61M 5/31 (2006.01); A61M 5/145 (2006.01); A61M 5/19 (2006.01); A61M 5/315 (2006.01); A61M 5/14 (2006.01)
CPC A61M 5/3146 (2013.01) [A61M 5/14546 (2013.01); A61M 5/19 (2013.01); A61M 5/31515 (2013.01); A61M 5/31596 (2013.01); A61M 2005/1402 (2013.01); A61M 2005/3152 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A method to deliver medication, the method comprising:
advancing a main pusher shaft, wherein the main pusher shaft is releasably coupled to an intermediate pusher shaft, the intermediate pusher shaft to engage with and advance a medication plunger;
advancing the medication plunger via the intermediate pusher shaft to urge medication through a delivery flow path of a tubing;
rotating a connecting gear by advancing the medication plunger, wherein the medication plunger includes a medication gear rack in meshed engagement with the connecting gear;
disengaging the intermediate pusher shaft from main pusher shaft while the medication gear rack is in meshed engagement with the connecting gear;
advancing the main pusher shaft relative to the intermediate pusher shaft and the medication plunger;
retracting a saline plunger to draw medical fluid or saline through a return path of the tubing, wherein the saline plunger includes a saline gear rack in meshed engagement with the connecting gear, and the saline plunger is retracted by rotating the connecting gear;
disengaging the medication gear rack from the connecting gear; and
advancing the saline plunger to urge saline through the delivery flow path of the tubing.