903 Radial type magnetically suspended centrifugal blood pump for artificial heart

2000 ◽  
Vol 2000 (0) ◽  
pp. 245-246
Author(s):  
Hiroyuki ONUMA ◽  
Toru MASUZAWA ◽  
Yohji OKADA
Keyword(s):  
Artificial Heart ◽  
Blood Pump ◽  
Centrifugal Blood Pump

PIV Measurements of Flow in a Centrifugal Blood Pump: Steady Flow

2004 ◽  
Vol 127 (2) ◽  
pp. 244-253 ◽  
Author(s):  
Steven W. Day ◽  
James C. McDaniel
Keyword(s):  
Shear Stress ◽  
Artificial Heart ◽  
Heart Valves ◽  
Blood Pump ◽  
Reynolds Stresses ◽  
Centrifugal Blood Pump ◽  
Flow Rates ◽  
Blood Damage ◽  
Artificial Heart Valves ◽  
Stagnant Flow

Magnetically suspended left ventricular assist devices have only one moving part, the impeller. The impeller has absolutely no contact with any of the fixed parts, thus greatly reducing the regions of stagnant or high shear stress that surround a mechanical or fluid bearing. Measurements of the mean flow patterns as well as viscous and turbulent (Reynolds) stresses were made in a shaft-driven prototype of a magnetically suspended centrifugal blood pump at several constant flow rates (3–9L∕min) using particle image velocimetry (PIV). The chosen range of flow rates is representative of the range over which the pump may operate while implanted. Measurements on a three-dimensional measurement grid within several regions of the pump, including the inlet, blade passage, exit volute, and diffuser are reported. The measurements are used to identify regions of potential blood damage due to high shear stress and∕or stagnation of the blood, both of which have been associated with blood damage within artificial heart valves and diaphragm-type pumps. Levels of turbulence intensity and Reynolds stresses that are comparable to those in artificial heart valves are reported. At the design flow rate (6L∕min), the flow is generally well behaved (no recirculation or stagnant flow) and stress levels are below levels that would be expected to contribute to hemolysis or thrombosis. The flow at both high (9L∕min) and low (3L∕min) flow rates introduces anomalies into the flow, such as recirculation, stagnation, and high stress regions. Levels of viscous and Reynolds shear stresses everywhere within the pump are below reported threshold values for damage to red cells over the entire range of flow rates investigated; however, at both high and low flow rate conditions, the flow field may promote activation of the clotting cascade due to regions of elevated shear stress adjacent to separated or stagnant flow.

scholarly journals Improvement of centrifugal blood pump for artificial heart with radially Maglev motor

2004 ◽  
Vol 16 (Supplement) ◽  
pp. 167-168
Author(s):  
Hiroyuki Onuma ◽  
Toru Masuzawa ◽  
Yohji Okada ◽  
Tomonori Tsukiya ◽  
Yoshiyuki Taenaka
Keyword(s):  
Artificial Heart ◽  
Blood Pump ◽  
Centrifugal Blood Pump

Experimental and Computational Studies of the Relative Flow Field in a Centrifugal Blood Pump

2000 ◽  
Vol 28 (1-2) ◽  
pp. 119-125 ◽  
Author(s):  
B. T. H. Ng ◽  
Weng Kong Chan ◽  
S. C. M. Yu ◽  
HaiDong Li
Keyword(s):  
Flow Field ◽  
Blood Pump ◽  
Computational Studies ◽  
Centrifugal Blood Pump ◽  
Relative Flow

Establishment of Flow Estimation for an Implantable Centrifugal Blood Pump

ASAIO Journal ◽  
1997 ◽  
Vol 43 (5) ◽  
pp. M663 ◽  
Author(s):  
YOSHINARI WAKISAKA ◽  
YASUKI OKUZONO ◽  
YOSHIYUKI TAENAKA ◽  
KENICHI CHIKANARI ◽  
TORU MASUZAWA ◽  
...  
Keyword(s):  
Blood Pump ◽  
Centrifugal Blood Pump ◽  
Flow Estimation

Flow Visualization Evaluation of Secondary Flow in a Centrifugal Blood Pump

ASAIO Journal ◽  
1993 ◽  
Vol 39 (3) ◽  
pp. M433-M437 ◽  
Author(s):  
ICHIRO SAKUMA ◽  
YASUHIRO FUKUI ◽  
YASUHISA OHARA ◽  
KENZO MAKINOUCHI ◽  
SETSUO TAKATANI ◽  
...  
Keyword(s):  
Flow Visualization ◽  
Secondary Flow ◽  
Blood Pump ◽  
Centrifugal Blood Pump ◽  
Visualization Evaluation

The Vienna Implantable Centrifugal Blood Pump

1994 ◽  
Vol 18 (7) ◽  
pp. 500-505 ◽  
Author(s):  
H. SCHIMA ◽  
W. TRUBEL ◽  
G. WIESELTHALERXY ◽  
C. SCHMIDT ◽  
M. R. MÜLLER ◽  
...  
Keyword(s):  
Blood Pump ◽  
Centrifugal Blood Pump
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