US 11,701,467 B2
Methods and devices for occlusion detection using actuator sensors
Afshin Bazargan, Simi Valley, CA (US); and Adam S. Trock, Simi Valley, CA (US)
Assigned to Medtronic MiniMed, Inc., Northridge, CA (US)
Filed by MEDTRONIC MINIMED, INC., Northridge, CA (US)
Filed on Jan. 29, 2020, as Appl. No. 16/776,081.
Claims priority of provisional application 62/800,310, filed on Feb. 1, 2019.
Prior Publication US 2020/0246540 A1, Aug. 6, 2020
Int. Cl. A61M 5/168 (2006.01); A61M 5/145 (2006.01); A61M 5/142 (2006.01)
CPC A61M 5/16831 (2013.01) [A61M 5/1452 (2013.01); A61M 5/1458 (2013.01); A61M 5/14244 (2013.01); A61M 5/14566 (2013.01); A61M 5/16804 (2013.01); A61M 2005/14506 (2013.01); A61M 2005/16863 (2013.01); A61M 2005/16868 (2013.01); A61M 2205/3331 (2013.01); A61M 2205/3365 (2013.01); A61M 2205/502 (2013.01); A61M 2230/201 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of detecting an occlusion in a fluid path, the method comprising:
operating, by a control module of an infusion device, a driver module to provide energy to an actuation arrangement to achieve a commanded actuation state, wherein the actuation arrangement is coupled to a plunger configured to deliver fluid via the fluid path;
ceasing, by the control module, providing of the energy to the actuation arrangement after the actuation arrangement achieved the commanded actuation state;
subsequent to the actuation arrangement achieving the commanded actuation state, obtaining, by the control module, a measured actuation state of the actuation arrangement via a sensing arrangement, the measured actuation state being a state of the actuation arrangement in which the actuation arrangement moved in a direction reverse to a direction in which the actuation arrangement moved to achieve the commanded actuation state;
determining an acceleration of the actuation arrangement or the plunger for a drive cycle based at least in part on the measured actuation state; and
detecting, by the control module, an occlusion condition based on a difference between the determined acceleration and a reference acceleration for achieving the commanded actuation state and a relationship between the commanded actuation state and the measured actuation state.