Magnetically driven axial-flow pump

DETAILED DESCRIPTION According to the present invention, there is provided a magnetically driven axial-flow pump comprising (i) an electromagnet unit arranged about the periphery of a pipe, (ii) a cylindrical rotor accommodated in the pipe, (iii) permanent magnets mounted on the periphery of the rotor, and (iv) a spiral vane formed on the inner surface of the rotor.
A hollow is formed in the axial center portion of the vane.
The advantages offered by the present invention are as follows.
Because the vane has a hollow in its axial center portion, the rotor and the vane can be made as one piece with an NC machine.
Besides, because the occurrence of gaps in the otherwise-inevitable joint between the rotor and the vane is precluded, it is unnecessary to coat such a joint to fill such gaps.
Thus, it is easy to make the rotor and the vane.
Furthermore, there are no gaps between the rotor and the vane as mentioned above and there is no object in contact with blood in the center portion of the vane.
Therefore, various germs do not enter blood, no thrombi are formed, blood tissues are not destroyed, and hence the pump is suitable as a blood pump.