US 12,138,421 B2
Apparatuses and methods for detecting user fill volume in medication delivery device
Scott Stewart, Pittsburgh, PA (US); Abigail Kruegle, Somerville, MA (US); Muzaffer Ozsecen, Groton, MA (US); and J. Richard Gyory, Sudbury, MA (US)
Assigned to Becton, Dickinson and Company, Franklin Lakes, NJ (US)
Filed by Becton, Dickinson and Company, Franklin Lakes, NJ (US)
Filed on Feb. 2, 2022, as Appl. No. 17/591,398.
Prior Publication US 2023/0241310 A1, Aug. 3, 2023
Int. Cl. A61M 5/145 (2006.01); A61M 5/142 (2006.01); A61M 5/168 (2006.01)
CPC A61M 5/1452 (2013.01) [A61M 5/14244 (2013.01); A61M 5/16804 (2013.01); A61M 2205/3331 (2013.01); A61M 2205/3553 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A medication delivery device comprising:
an infusion pump system comprising
a reservoir comprising a fluid chamber portion,
an outlet fluid path between the fluid chamber portion of the reservoir and an insertion mechanism,
an inlet fluid path between the fluid chamber portion of the reservoir and a fill port,
a plunger inside the reservoir comprising a front side in contact with a fluid medication in the fluid chamber portion, and configured to seal the fluid medication in the fluid chamber portion from entering a portion of the reservoir defined by a rear side of the plunger, and
a pump drive mechanism coupled with the reservoir;
a pressure sensor sensing a pressure inside the reservoir; and
a processing device configured to determine a user fill volume of the fluid medication by analyzing a location of the plunger with respect to the reservoir,
wherein
an initial position of the pump drive mechanism corresponds to the location of the plunger with respect to the reservoir after a fill of the reservoir with the fluid medication is completed when the plunger is stopped with respect to the reservoir and the outlet fluid path and the inlet fluid path are blocked such that any fluid medication is not allowed to flow in the infusion pump system,
a current position of the pump drive mechanism system corresponds to the location of the plunger with respect to the reservoir when after an initialization of the pump drive mechanism, the outlet fluid path and the inlet fluid path remain blocked, the plunger is advanced with respect to the reservoir, and the pressure inside the reservoir sensed by the pressure sensor is greater than a predetermined threshold value, and
the processing device determines the user fill volume of the fluid medication with reference to the initial position of the pump drive mechanism and the current position of the pump drive mechanism.