US 12,070,579 B2
Occlusion detection for infusion pumps
Kevin Gregory Carothers, San Diego, CA (US); Richard Stor Wu, San Diego, CA (US); Robert Dwaine Butterfield, Poway, CA (US); and Robert Steven Vasko, San Diego, CA (US)
Assigned to CAREFUSION 303, INC., San Diego, CA (US)
Filed by CareFusion 303, Inc., San Diego, CA (US)
Filed on Aug. 7, 2023, as Appl. No. 18/230,900.
Application 18/230,900 is a continuation of application No. 17/013,421, filed on Sep. 4, 2020, granted, now 11,771,825.
Application 17/013,421 is a continuation of application No. 15/792,226, filed on Oct. 24, 2017, granted, now 10,792,420, issued on Oct. 6, 2020.
Prior Publication US 2023/0381410 A1, Nov. 30, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 5/168 (2006.01); G01L 7/04 (2006.01); G06N 5/04 (2023.01); G06N 20/00 (2019.01); G08B 21/18 (2006.01); G16H 20/17 (2018.01); G16H 40/40 (2018.01); G16H 40/63 (2018.01); G16H 50/50 (2018.01)
CPC A61M 5/16859 (2013.01) [G01L 7/04 (2013.01); G06N 5/04 (2013.01); G06N 20/00 (2019.01); G08B 21/182 (2013.01); G16H 20/17 (2018.01); G16H 40/40 (2018.01); G16H 40/63 (2018.01); A61M 2005/16868 (2013.01); A61M 2005/16872 (2013.01); A61M 2205/3553 (2013.01); A61M 2205/3561 (2013.01); A61M 2205/3584 (2013.01); A61M 2205/52 (2013.01); A61M 2205/583 (2013.01); G16H 50/50 (2018.01)] 20 Claims
OG exemplary drawing
 
1. An infusion pump configured for detection of a fluid condition in a flexible tube, the infusion pump comprising:
a restraining element for receiving the tube;
a sensor coupled to the restraining element and positioned to obtain a value of a tubing force when the tube is engaged by the restraining element;
a memory storing instructions; and
a processor configured to execute the instructions to:
generate a force-time curve representative of values of the tubing force obtained by the sensor over time;
determine a time-decaying parameter associated with the tubing force characterizing the force-time curve;
determine a fluid pressure value for a fluid in the tube based at least in part on the time-decaying parameter;
introduce a pump reversal event; and
detect that a rate of change of the tubing force exceeds a threshold.