| 摘要 |
A disposable puming unit (12; 60; 86; 124) adapted to be releasably mounted on a magnetic drive device (14) for pumping biological fluid, such as blood. The pumping unit (12; 60; 86; 124) includes a pump housing (30 and 32); 62; 92; 128) enclosing a pumping chamber (P; 70), a bearing (42; 78B; 98, 152) supported in the pumping chamber (P; 70), and an impeller (44; 72, 90; 126) rotatably supported on the bearing (42; 78B; 98; 152). The impeller (44; 72; 90; 126) includes a plurality of openings configured to expose the bearing (42; 78B; 98; 152) to the fluid. Magnets or a magnetic ring (59; 82; 110; 158) are carried by the impeller (44; 72; 90; 126), and are adapted to be magnetically coupled with the magnetic drive device (14) to rotate the impeller (44; 72; 90; 126), and thereby pump fluid through the pumping unit (12; 60; 86; 124). |
