| 摘要 |
An impeller for stirring sterile liquids has a plurality of stirring plates, an impeller head supporting the stirring plates and having an outer surface, a central hollow chamber with an opening, a conduit connecting the central hollow chamber with the outer surface, and a driving pin received in the opening. The impeller head has a lower region provided with a plurality of grooves which during rotation of the impeller head provide an effect of pumping the liquids.
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