US 11,806,517 B2
Impeller displacement based flow estimation
Ethan Falk Petersen, Oakland, CA (US)
Assigned to TC1 LLC, St. Paul, MN (US)
Filed by TC1 LLC, St. Paul, MN (US)
Filed on May 27, 2020, as Appl. No. 16/884,956.
Application 16/884,956 is a division of application No. 15/212,721, filed on Jul. 18, 2016, granted, now 10,722,630.
Claims priority of provisional application 62/194,700, filed on Jul. 20, 2015.
Prior Publication US 2020/0282121 A1, Sep. 10, 2020
Int. Cl. A61M 60/419 (2021.01); A61M 60/422 (2021.01); A61M 60/237 (2021.01); A61M 60/232 (2021.01); A61M 60/538 (2021.01); A61M 60/178 (2021.01); A61M 60/148 (2021.01); A61M 60/818 (2021.01); A61M 60/824 (2021.01)
CPC A61M 60/419 (2021.01) [A61M 60/178 (2021.01); A61M 60/232 (2021.01); A61M 60/237 (2021.01); A61M 60/422 (2021.01); A61M 60/538 (2021.01); A61M 60/148 (2021.01); A61M 60/818 (2021.01); A61M 60/824 (2021.01); A61M 2205/332 (2013.01); A61M 2205/3334 (2013.01); A61M 2205/3344 (2013.01); A61M 2210/125 (2013.01); A61M 2210/127 (2013.01); A61M 2230/04 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A circulation assist system comprising:
a centrifugal blood pump comprising:
a housing forming a blood flow channel;
an impeller disposed within the blood flow channel;
a motor stator mounted to the housing and operable to magnetically rotate the impeller, wherein the motor stator comprises levitation coils via which a radial position of the impeller within the blood flow channel is controlled, and wherein a thrust load applied to the impeller by blood impelled through the blood flow channel by the impeller is reacted by the motor stator; and
Hall-Effect sensors configured to generate output indicative of an eccentricity and a position of the impeller within the blood flow channel, wherein the Hall-Effect sensors surround a circumferential wall of the blood flow channel; and
a controller operatively coupled with the motor stator and the Hall-Effect sensors, wherein the controller is configured to determine a rotational rate of the impeller and process the rotational rate of the impeller and the output generated by the Hall-Effect sensors to estimate at least one of:
the thrust load applied to the impeller;
a pressure differential of the blood impelled through the blood flow channel; or
a flow rate of the blood impelled through the blood flow channel.