US 12,251,544 B2
System and method for air detection in fluid injector
Michael McDermott, Pittsburgh, PA (US); William Barone, Pittsburgh, PA (US); Barry Iddon, Jeannette, PA (US); and John Volkar, Valencia, PA (US)
Assigned to BAYER HEALTHCARE LLC, Whippany, NJ (US)
Appl. No. 17/048,219
Filed by BAYER HEALTHCARE LLC, Whippany, NJ (US)
PCT Filed Apr. 18, 2019, PCT No. PCT/US2019/028124
§ 371(c)(1), (2) Date Oct. 16, 2020,
PCT Pub. No. WO2019/204605, PCT Pub. Date Oct. 24, 2019.
Claims priority of provisional application 62/723,711, filed on Aug. 28, 2018.
Claims priority of provisional application 62/659,988, filed on Apr. 19, 2018.
Prior Publication US 2021/0146063 A1, May 20, 2021
Int. Cl. A61M 5/36 (2006.01); A61M 5/00 (2006.01); A61M 5/145 (2006.01); A61M 5/31 (2006.01)
CPC A61M 5/365 (2013.01) [A61M 5/007 (2013.01); A61M 5/3146 (2013.01); A61M 5/14546 (2013.01); A61M 2205/3379 (2013.01); A61M 2205/3386 (2013.01); A61M 2205/50 (2013.01); A61M 2205/502 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An injector system for delivering a medical fluid, comprising:
at least one syringe defining a reservoir operatively connected to a piston, the at least one syringe comprising a plunger and at least one port in fluid communication with the reservoir, the reservoir configured to contain the medical fluid; and
at least one processor programmed or configured to:
based on an air check protocol for detecting air in the reservoir, determine a baseline value comprising baseline compressibility data for the at least one syringe of the injector system, wherein the reservoir is substantially filled with a first amount of the medical fluid and a known volume of air;
deliver the first amount of the medical fluid from the reservoir;
refill the reservoir with a second amount of the medical fluid;
based on the air check protocol, perform an air check pressurization sequence by gathering air check compressibility data for the at least one syringe of the injector system; and
based on the air check protocol, compare the air check compressibility data with the baseline compressibility data to determine a volume of air present in the reservoir
wherein the processor is further programmed or configured to, based on the air check protocol, incorporate a correction factor when comparing the air check compressibility data with the baseline compressibility data to account for variations in at least one of deflection of one or more injector system components, different volumes of the medical fluid compared to the volume of the first amount of the medical fluid used for determining the baseline compressibility data, and different positions of the piston compared to a position of the piston when determining the baseline compressibility data.