US 12,390,168 B2
Systems and methods for estimating a position of a heart pump
Ahmad El Katerji, Danvers, MA (US); and Chen Liu, Danvers, MA (US)
Assigned to ABIOMED, Inc., Danvers, MA (US)
Filed by ABIOMED, Inc., Danvers, MA (US)
Filed on Dec. 14, 2023, as Appl. No. 18/539,929.
Application 17/686,560 is a division of application No. 16/354,595, filed on Mar. 15, 2019, granted, now 11,298,524, issued on Apr. 12, 2022.
Application 18/539,929 is a continuation of application No. 17/686,560, filed on Mar. 4, 2022, granted, now 11,883,207.
Claims priority of provisional application 62/644,240, filed on Mar. 16, 2018.
Prior Publication US 2024/0260905 A1, Aug. 8, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 60/531 (2021.01); A61B 5/00 (2006.01); A61M 60/13 (2021.01); A61M 60/148 (2021.01); A61M 60/174 (2021.01); A61M 60/216 (2021.01); A61M 60/411 (2021.01); A61M 60/538 (2021.01); A61M 60/554 (2021.01); A61M 60/816 (2021.01); A61M 60/829 (2021.01); A61M 60/867 (2021.01); A61B 5/024 (2006.01)
CPC A61B 5/7239 (2013.01) [A61M 60/13 (2021.01); A61M 60/148 (2021.01); A61M 60/174 (2021.01); A61M 60/216 (2021.01); A61M 60/411 (2021.01); A61M 60/538 (2021.01); A61M 60/554 (2021.01); A61M 60/816 (2021.01); A61M 60/829 (2021.01); A61M 60/867 (2021.01); A61B 5/0031 (2013.01); A61B 5/024 (2013.01); A61M 2205/3331 (2013.01); A61M 2205/3334 (2013.01); A61M 2205/3344 (2013.01); A61M 2205/3351 (2013.01); A61M 2205/3355 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A heart pump system comprising:
a pump comprising a pump housing and a rotor, the pump housing having a proximal end and a distal end;
a cannula comprising a proximal end that interfaces with the distal end of the pump housing and a distal end, the pump being configured to be operated by a motor;
an elongate catheter extending proximal of the pump housing;
a differential pressure sensor; and
a controller configured to:
receive first data indicative of a time-varying motor current during a first period of time, wherein the time-varying motor current corresponds to an amount of current delivered to the motor while the heart pump system is operating in a patient,
receive second data from the differential pressure sensor, wherein the second data is indicative of a time-varying differential pressure during the first period of time,
receive third data indicative of time-varying motor current during a second period of time later than the first period of time,
determine an estimate of time-varying differential pressure during the second period of time from the third data and a relationship between the first data and the second data,
receive fourth data from the differential pressure sensor, the fourth data indicative of the time-varying differential pressure during the second period of time,
determine the time-varying differential pressure indicated by the fourth data is drifting based on a comparison of (a) the time-varying differential pressure during the second period of time indicated by the fourth data, to (b) the estimate of time-varying differential pressure during the second period of time, and
in response to determining the time-varying differential pressure during the second period of time is drifting, automatically re-calibrating the differential pressure sensor.