| 摘要 |
A rotary piston pump for the displacement of blood has a single-lobe trochoidal surface along the peripheral wall of a housing and an eccentrically displaced rotary piston having a pair of opposite edges confronting this surface. The edges confronting the surface are rounded of circular arc curvature with a radius less than the equidistant between the theoretical epitrochoid of the orbits of these edges and the surface. A gap seal is thus provided which prevents damage to blood vessels when the pump is used for the circulation of blood, e.g. in an artificial heart.
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