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 |
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.
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