Design progress of the ultracompact integrated heart lung assist device--part 2: optimization of the diffuser vane profile.
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.
Tsukiya
Tomonori
T
Department of Artificial Organs, Research Institute of National Cardiovascular Center, Suita, Osaka, Japan. tsukiya@ri.ncvc.go.jp
Tatsumi
Eisuke
E
Nishinaka
Tomohiro
T
Katagiri
Nobumasa
N
Takewa
Yoshiaki
Y
Ohnishi
Hiroyuki
H
Oshikawa
Mitsuo
M
Mizuno
Toshihide
T
Taenaka
Yoshiyuki
Y
Takano
Hisateru
H
Kitamura
Soichiro
S
D002498:Centrifugation; D004867:Equipment Design; D006353:Heart-Assist Devices; D006355:Heart-Lung Machine; D006461:Hemolysis; D010107:Oxygenators, Membrane; D012212:Rheology; D012399:Rotation