Patent ID: 7859156
Filing Date: 2010-12-28
Classification: A61M,F16C,H01F,H02K

Abstract:
1. An axial blood pump comprising: a rotor having an axis of rotation, magnetic bearings for suspending the rotor within the pump, at least one of the bearings including at least one hard magnetic object having a symmetry axis, the magnetic object including: at least one hard magnetic moulding having a first shape and a first magnetic vector measured to be deviating from said symmetry axis at a first angle and at least one moulded element having a second shape and selected to have a second magnetic vector deviating from said symmetry axis at a second angle, the second magnetic vector having a suitable pairing factor related to the at least one hard magnetic moulding, and wherein upon combining by aligning the at least one hard magnetic moulding and the at least one moulded element a third non-zero magnetic vector results on a front face of the magnetic object, said non-zero third magnetic vector being determined by fixedly connecting the first shape of the at least one hard magnetic moulding and the second shape of the at least one moulded element in order to point in a direction within 0.3° of the symmetry axis, the third non-zero magnetic vector of the magnetic object being substantially aligned with the axis of rotation.