title: Enhancement of hemocompatibility of the MERA monopivot centrifugal pump: toward medium-term use.
abstract: The MERA monopivot centrifugal pump has been developed for use in open-heart surgery, circulatory support, and bridge-to-decision for up to 4 weeks. The pump has a closed-type, 50-mm diameter impeller with four straight paths. The impeller is supported by a monopivot bearing and is driven by a radial-flux magnet-coupling motor. Because flow visualization experiments have clarified sufficient pivot wash and stagnation at the sharp corner of the pivot support was suggested, sharp corners were removed in the design stage. The index of hemolysis of the pump operating at more than 200 mm Hg was found to be lower than that of a commercial pump. Four-week animal tests were then conducted two times; improvement of thrombus formation was seen in the female pivot through modification of female pivot geometry. Overall antithrombogenicity was also recorded. Finally, to assure mid-term use, an additional 4-week durability test revealed that the rate of the axial pivot wear was as small as 1.1 µm/day. The present in vitro and in vivo studies revealed that the MERA monopivot centrifugal pump has sufficient hemocompatibility and durability for up to 4 weeks.
authors.affiliation: School of Engineering, Kobe University, Rokkodai-cho 1-1, Nada-ku, Kobe, Hyogo 657-8501, Japan. yamane@mech.kobe-u.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamane
authors.forename: Ryo
authors.initials: R
authors.lastname: Kosaka
authors.forename: Masahiro
authors.initials: M
authors.lastname: Nishida
authors.forename: Osamu
authors.initials: O
authors.lastname: Maruyama
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Kuwana
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kawamura
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Shiraishi
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Yambe
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Sankai
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Tsutsui
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D002417:Cattle; D006041:Goats; D006353:Heart-Assist Devices / Q000009:adverse effects; D006461:Hemolysis; D008422:Materials Testing; D023421:Models, Animal; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013927:Thrombosis / Q000097:blood / Q000209:etiology / Q000517:prevention & control; D013997:Time Factors
chemical_list: D001672:Biocompatible Materials