Rotary-piston pump
AssigneeRheinisch-Westfaelische Technische Hochschule Aachen
InventorsJohannes Wappenschmidt, Andreas Goetzenich, Ruediger Autschbach, Ulrich Steinseifer
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Abstract
The invention relates to a rotary piston pump, in particular for pumping blood, comprising a piston rotor (1) which has particularly two or three faces when seen in cross-section, which is mounted in a piston chamber (2) and eccentrically rotates, the piston rotor (1) having in its interior a plurality of magnetically interacting elements (4, 4a, 4b), in particular permanent magnets and/or coils, and being driven by the magnetic interaction of these elements (4, 4a, 4b) with at least one moving magnetic field.
Claims4
A rotary-piston pump for supplying blood, the pump comprising:
- a stator housing forming a piston chamber having a central axis and a housing end wall;
- a trochoidal piston rotor having two or three lobes as seen in cross-section, rotatable eccentrically of the axis in the piston chamber, and having an axial end face juxtaposed axially with the housing end wall;
- a plurality of magnetically attractable elements in the piston rotor at the axial end face;
- and
- a plurality of coils on the housing end wall outside the chamber, for, on rotation of the rotor relative to the housing, generating at least one moving magnetic field effective through the housing end wall for rotationally driving the rotor solely by magnetic interaction, the coils being positioned in accordance with an envelope of the trochoidal rotor.
Dependencies are inferred from the claim text.