title: Design progress of the ultracompact integrated heart lung assist device--part 2: optimization of the diffuser vane profile.
abstract: The configuration of the vaned diffuser of the integrated heart lung assist device (IHLAD) has been revised to reduce mechanical blood trauma caused by the device. The flow visualization study of the flow near the diffuser vanes revealed the existence of a rotating stall which deteriorates the hydrodynamic performance of the device and augments the chance for blood cells to pass through the regions with intense shearing forces. Design changes of the diffuser included decrease in vane number from 7 to 5 and decrease in passage width from 3 mm to 2 mm. This design change was effective to suppress initiation of a rotating stall. Improvement of hydrodynamic performance and antihemolytic properties was confirmed with the newly designed configuration based on the flow visualization study.
authors: Department of Artificial Organs, Research Institute of National Cardiovascular Center, Suita, Osaka, Japan. tsukiya@ri.ncvc.go.jp
authors: Tomonori
authors: T
authors: Tsukiya
authors: Eisuke
authors: E
authors: Tatsumi
authors: Tomohiro
authors: T
authors: Nishinaka
authors: Nobumasa
authors: N
authors: Katagiri
authors: Yoshiaki
authors: Y
authors: Takewa
authors: Hiroyuki
authors: H
authors: Ohnishi
authors: Mitsuo
authors: M
authors: Oshikawa
authors: Toshihide
authors: T
authors: Mizuno
authors: Yoshiyuki
authors: Y
authors: Taenaka
authors: Hisateru
authors: H
authors: Takano
authors: Soichiro
authors: S
authors: Kitamura
mesh_terms: D002498:Centrifugation; D004867:Equipment Design; D006353:Heart-Assist Devices; D006355:Heart-Lung Machine; D006461:Hemolysis; D010107:Oxygenators, Membrane; D012212:Rheology; D012399:Rotation