Patent ID: 11959497
Assignee: BERLIN HEART GMBH
Field: Measurement (Instruments)
Classification: CPC F  A  G  H | IPC A  F  G  H

Claim 15:
16. A blood pump device comprising a blood pump comprising:
a rotor configured to transport blood at least partially in an axial direction of the blood pump, the rotor mounted in a magnetic axial bearing;
a device for detecting a rotational speed of the rotor as a first operational parameter;
a device for detecting a rotor position in an axial direction of the blood pump as a second operational parameter;
a device for determining a change in behaviour over time of the rotational speed and the rotor position;
a device for measuring a back EMF (electromagnetic force) of a brushless drive motor of the rotor; and
a determination device configured to determine a flow through the blood pump, a difference in pressure across the blood pump, and/or a viscosity of blood based on the determined change in behaviour of the first and second operational parameters, wherein, in the determination of the flow through the blood pump, the difference in pressure across the blood pump, and/or the viscosity of the blood, a differential equation is taken into consideration which describes a dependency of the back EMF on a rotor deflection in an axial direction of the blood pump, a rotational speed of the rotor, and a drive power of the rotor.