US 12,246,119 B2
Patient line blockage detection
William Scott Crawford, Palo Alto, CA (US); and Robert Matthew Ohline, Redwood City, CA (US)
Assigned to Fresenius Medical Care Holdings, Inc., Waltham, MA (US)
Filed by Fresenius Medical Care Holdings, Inc., Waltham, MA (US)
Filed on May 8, 2023, as Appl. No. 18/144,729.
Application 18/144,729 is a continuation of application No. 17/369,372, filed on Jul. 7, 2021, granted, now 11,679,184.
Application 17/369,372 is a continuation of application No. 15/198,211, filed on Jun. 30, 2016, granted, now 11,071,809, issued on Jul. 27, 2021.
Prior Publication US 2023/0270922 A1, Aug. 31, 2023
Int. Cl. A61M 1/14 (2006.01); A61M 1/28 (2006.01); A61M 1/36 (2006.01); A61M 5/168 (2006.01)
CPC A61M 1/14 (2013.01) [A61M 1/154 (2022.05); A61M 1/155 (2022.05); A61M 1/159 (2022.05); A61M 1/28 (2013.01); A61M 1/285 (2013.01); A61M 1/3656 (2014.02); A61M 5/16831 (2013.01); A61M 5/16854 (2013.01); A61M 1/1522 (2022.05); A61M 1/1524 (2022.05); A61M 1/1561 (2022.05); A61M 1/1565 (2022.05); A61M 1/3661 (2014.02); A61M 2005/16863 (2013.01); A61M 2005/16868 (2013.01); A61M 2205/18 (2013.01); A61M 2205/3331 (2013.01); A61M 2205/3355 (2013.01); A61M 2205/3362 (2013.01); A61M 2205/50 (2013.01); A61M 2205/52 (2013.01); A61M 2205/70 (2013.01); A61M 2205/702 (2013.01); A61M 2209/02 (2013.01); A61M 2210/1017 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
providing or withdrawing a fluid to or from a distensible medical tube connected to a medical device at a volumetric flow rate over time, the medical tube including a patient line region and a catheter region separated by a fluid capacitive element;
measuring, by a pressure sensor at the patient line region, a plurality of pressures over time of the fluid; and
determining whether an occlusion in the medical tube is present in the patient line region or the catheter region based at least partly on a fluidic resistance of the patient line region detected by a measurement of a transient component of the measured plurality of pressures over time and a fluidic resistance of the catheter region detected by the measurement of the transient component of the measured plurality of pressures over time.
 
11. A medical device comprising:
a distensible medical tube connected to a port of the medical device, the medical tube including a patient line region and a catheter region separated by a fluid capacitive element;
one or more pumps configured for providing or withdrawing a fluid to or from the medical tube at a volumetric flow rate;
a pressure sensor at the patient line region, the pressure sensor configured for measuring a plurality of pressures over time of the fluid; and
a processor configured for determining whether an occlusion in the medical tube is present in the patient line region or the catheter region based at least partly on a fluidic resistance of the patient line region detected by a measurement of a transient component of the measured plurality of pressures over time and a fluidic resistance of the catheter region detected by the measurement of the transient component of the measured plurality of pressures over time.