| 摘要 |
A pump for pumping liquid devised for medical or surgical use operates on an Archimedean screw principle and comprises a flexible plastics tube (11) having a flexible central drive cable or rod (15) stretching between its ends. An operative end (12) contains a Archimedean screw pump element (14) having a helix angle between 30 DEG and 45 DEG and centrally positioned by a spider (16). The operative end (12) has a filter mesh (13) and can be used for pumping blood. urine or other body fluids for example. The pump does not produce a vacuum and so avoids suction effect on surrounding tissue and the entrainment of large quantities of air. <IMAGE> |
