Method for determining operational parameters of a blood pump
AssigneeBerlin Heart GmbH
InventorsMarcus Granegger, Robert Steingräber, Jonas Fabian Krone
Life of this patent
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Abstract
Methods and apparatuses for determining operational parameters of a blood pump comprising a rotor which transports the blood are provided. The change in the behaviour of at least one first and one second operational parameter, independently from each other, of the pump, is determined. A determination of the flow through the pump and/or the difference in pressure across the pump and/or the viscosity of the blood takes into account the determined change in behaviour of the at least two operational parameters. A modelling for a dynamic model of the known quantities may be carried out and an estimation method using a Kalman filter may be used.
Claims20
A method for determining operational parameters of a blood pump comprising a rotor which transports blood, the method comprising:
- determining a change in behaviour of at least two operational parameters including a first operation parameter and a second operation parameter, independently from each other, of the blood pump;
- and
- determining a flow through the blood pump, a difference in pressure across the blood pump, and/or a viscosity of the blood based on the determined change in behaviour of the at least two operational parameters,
- wherein a back EMF (electromagnetic force) of a brushless drive motor of the rotor is measured and, 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 drive power.
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.
A blood pump device comprising a blood pump, the 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 non-magnetic axial bearing;
- a device configured to detect a rotational speed of the rotor as first operational parameter;
- a device configured to detect a flow through the blood pump or a pressure at the blood pump inlet as second operational parameter;
- a device configured to determine a change in behaviour over time of the rotational speed and the flow or the pressure;
- a device for measuring a back EMF (electromagnetic force) of a brushless drive motor of the rotor;
- and
- a determination device configured to determine the flow through the blood pump, a difference in pressure across the blood pump, and/or a viscosity of the blood under consideration of 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.
Dependencies are inferred from the claim text.