| 摘要 |
A blood pump for assisting a heart is provided having a stator and a rotor. The rotor is magnetically radially supported creating a suspension gap between t he stator and the rotor. The rotor can be supported axially by a Lorentz force bearing and can be magnetically rotated. The stator can have a single or double volute pump cha mber and the rotor can have an impeller portion for pumping blood. The rotor can have a center bore as a primary blood flowpath. The suspension gap can be a secondary bloo d flowpath. The blood pump can also have an axial position controller and a fl ow rate controller. The axial position controller can cause the axial bearing to adj ust the position of the rotor. The flow rate controller can have a member for measur ing a dimension of a heart ventricle to control the flow rate to avoid overly dist ending or contracting the ventricle. A method of operating the flow rate controller to create a pulsatile flow rate is also provided. Additionally, the blood pump can be pa rt of a cardiac assist and arrhythmia control system. Moreover, a method of operatin g the flow rate controller can be provided which reduces the amount of energy need ed to treat fibrillation. The method can include operating the flow rate controller to r educe a radial dimension of the ventricle prior to delivering defibrillation energy such that the ventricle contains less blood which absorbs less energy so that a larger fra ction of the energy is delivered to the heart.
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