Abstract
A nutation-type centrifugal blood pump (Tea-Spoon type B. P.) has been much improved in the configurations of impeller and annular passage, and the flexible diaphram-type shaft-seal. This pump proved to be of satisfactory performance in the non-pulsatile mode. Unblance by nutating motion of impeller and rod induces vibration, and it results in increase of friction energy-loss. Dynamic balance should be taken into account. Preliminary test showed that this pump had a good characteristic in the pulsatile mode.
