Adaptive flow calculation for a mechanical circulatory support device

A circulatory support device, comprising:

• a rotor;
• a motor configured to drive rotation of the rotor at one or more speeds;
• and
• at least one controller configured to:
• receive a motor current signal measured from the motor;
• determine within a time window of the motor current signal, a measured motor current value at which flow through the circulatory support device is maximum;
• determine an offset value based, at least in part, on the measured motor current value;
• determine based, at least in part, on the received motor current signal, whether an abnormal condition has occurred;
• adjust the motor current signal measured from the motor based, at least in part, on the offset value and the determination of whether an abnormal condition has occurred to produce an adjusted motor current signal;
• and
• determine the flow through the circulatory support device based, at least in part, on the adjusted motor current signal.

A controller for a circulatory support device, the controller comprising:

• at least one hardware processor configured to:
• receive a motor current signal measured from a motor of the circulatory support device;
• determine within a time window of the motor current signal, a measured motor current value at which flow through the circulatory support device is maximum;
• determine an offset value based, at least in part, on the measured motor current value;
• determine based, at least in part, on the received motor current signal, whether an abnormal condition has occurred;
• adjust the motor current signal measured from the motor based, at least in part, on the offset value and the determination of whether an abnormal condition has occurred to produce an adjusted motor current signal;
• and
• determine the flow through the circulatory support device based, at least in part, on the adjusted motor current signal.