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 |
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.
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