title: Pivot wear of a centrifugal blood pump developed for circulatory assist.
abstract: We are developing a monopivot centrifugal pump for circulatory assist for a period of more than 2 weeks. The impeller is supported by a pivot bearing at one end and by a passive magnetic bearing at the other. The pivot undergoes concentrated exposure to the phenomena of wear, hemolysis, and thrombus formation. The pivot durability, especially regarding the combination of male/female pivot radii, was examined through rotating wear tests and animal tests. As a result, combinations of similar radii for the male/female pivots were found to provide improved pump durability. In the extreme case, the no-gap combination would result in no thrombus formation.
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Namiki 1-2-1, Tsukuba 305-8564, Japan. yamane.t@aist.go.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamane
authors.forename: Katsunobu
authors.initials: K
authors.lastname: Nonaka
authors.forename: Hisashi
authors.initials: H
authors.lastname: Miyoshi
authors.forename: Osamu
authors.initials: O
authors.lastname: Maruyama
authors.forename: Masahiro
authors.initials: M
authors.lastname: Nishida
authors.forename: Ryo
authors.initials: R
authors.lastname: Kosaka
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Sankai
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Tsutsui
mesh_terms: D000818:Animals; D004867:Equipment Design; D006353:Heart-Assist Devices / Q000009:adverse effects; D006461:Hemolysis; D012399:Rotation; D012756:Sheep; D013927:Thrombosis / Q000209:etiology