Plasma Skimming in a Spiral Groove Bearing of a Centrifugal Blood Pump

2016 ◽  
Vol 40 (9) ◽  
pp. 856-866 ◽  
Author(s):  
Tomotaka Murashige ◽  
Daisuke Sakota ◽  
Ryo Kosaka ◽  
Masahiro Nishida ◽  
Yasuo Kawaguchi ◽  
...  
Keyword(s):  
Blood Pump ◽  
Spiral Groove ◽  
Centrifugal Blood Pump ◽  
Plasma Skimming ◽  
Spiral Groove Bearing

scholarly journals Plasma skimming efficiency of human blood in the spiral groove bearing of a centrifugal blood pump

2020 ◽  
Author(s):  
Daisuke Sakota ◽  
Kazuki Kondo ◽  
Ryo Kosaka ◽  
Masahiro Nishida ◽  
Osamu Maruyama
Keyword(s):  
Red Blood Cells ◽  
Human Blood ◽  
Blood Cells ◽  
High Speed ◽  
Blood Pump ◽  
Spiral Groove ◽  
Centrifugal Blood Pump ◽  
Plasma Skimming ◽  
Ridge Area ◽  
Spiral Groove Bearing

Abstract This work investigates the plasma skimming effect in a spiral groove bearing within a hydrodynamically levitated centrifugal blood pump when working with human blood having a hematocrit value from 0 to 40%. The present study assessed the evaluation based on a method that clarified the limitations associated with such assessments. Human blood was circulated in a closed-loop circuit via a pump operating at 4000 rpm at a flow rate of 5 L/min. Red blood cells flowing through a ridge area of the bearing were directly observed using a high-speed microscope. The hematocrit value in the ridge area was calculated using the mean corpuscular volume, the bearing gap, the cross-sectional area of a red blood cell, and the occupancy of red blood cells. The latter value was obtained from photographic images by dividing the number of pixels showing red blood cells in the evaluation area by the total number of pixels in this area. The plasma skimming efficiency was calculated as the extent to which the hematocrit of the working blood was reduced in the ridge area. For the hematocrit in the circuit from 0 to 40%, the plasma skimming efficiency was approximately 90%, meaning that the hematocrit in the ridge area became 10% as compared to that in the circuit. For a hematocrit of 20% and over, red blood cells almost completely occupied the ridge. Thus, a valid assessment of plasma skimming was only possible when the hematocrit was less than 20%.

scholarly journals C14 Study of Spiral Groove Bearing for Centrifugal Blood pump

2006 ◽  
Vol 2006.59 (0) ◽  
pp. 69-70
Author(s):  
Youichi NAKAMURA ◽  
Yuuki TSURUTA ◽  
Masaki OOMORI ◽  
Masashi NISHIDA ◽  
Hiroshi TSUKAMOTO ◽  
...  
Keyword(s):  
Blood Pump ◽  
Spiral Groove ◽  
Centrifugal Blood Pump ◽  
Spiral Groove Bearing

Experimental Study of Dynamic Characteristics of a Centrifugal Blood Pump With a Conical Spiral Groove Bearing for a Ventricular Assist Device

2007 ◽  
Author(s):  
Youichi Nakamura ◽  
Hiroshi Tsukamoto ◽  
Koji Miyazaki ◽  
Yi Qian
Keyword(s):  
Dynamic Characteristics ◽  
Ventricular Assist Device ◽  
Blood Pump ◽  
Vibration Exciter ◽  
Spiral Groove ◽  
Assist Device ◽  
Ventricular Assist ◽  
Centrifugal Blood Pump ◽  
Mock Circulatory System ◽  
Spiral Groove Bearing

Ventricular assist device (VAD) has been effective for cardiac patient. The VAD is set downstream of the heart, the pulsation of which effects the blood pump of the VAD. Therefore, the dynamic characteristics of the blood pump are important. In this study, we investigated the dynamic characteristics and rotor whirling motion of a centrifugal blood pump with a Conical Spiral Groove Bearing (CSGB). The flow through the pump was excited from 0.25 to 3 Hz by the vibration exciter in the mock circulatory system, and the conditions for stability of the blood pump were determined based on the dynamic characteristics tests.

Numerical Calculation for Whirling Motion of a Centrifugal Blood Pump with Conical Spiral Groove Bearings

2010 ◽  
Author(s):  
Daichi Shigemaru ◽  
Hiroshi Tsukamoto ◽  
M. A. Wahid ◽  
S. Samion ◽  
N. A. C. Sidik ◽  
...  
Keyword(s):  
Numerical Calculation ◽  
Blood Pump ◽  
Spiral Groove ◽  
Centrifugal Blood Pump ◽  
Whirling Motion

scholarly journals Basic Investigation of hemolytic of the Conical Spiral Groove Bearing for an Axial Flow Blood Pump

2008 ◽  
Vol 20 (Supplement) ◽  
pp. 141-141
Author(s):  
Tatsuya Murata ◽  
Hirohito Sumikura ◽  
Kazuyoshi Fukunaga ◽  
Yasuharu Ohgoe ◽  
Toshiyuki Yaguti ◽  
...  
Keyword(s):  
Axial Flow ◽  
Blood Pump ◽  
Spiral Groove ◽  
Axial Flow Blood Pump ◽  
Basic Investigation ◽  
Spiral Groove Bearing

scholarly journals INVESTIGATION OF BASIC CHARACTERISTICS OF THE CONICAL SPIRAL GROOVE BEARING FOR THE AXIAL FLOW BLOOD PUMP

2007 ◽  
Vol 19 (Supplement) ◽  
pp. 31-31
Author(s):  
Yasuhiro Kanegae ◽  
Hirohito Sumikura ◽  
Kazuyoshi Fukunaga ◽  
Toshiyuki Yaguchi ◽  
Akio Funakubo ◽  
...  
Keyword(s):  
Axial Flow ◽  
Blood Pump ◽  
Spiral Groove ◽  
Axial Flow Blood Pump ◽  
Basic Characteristics ◽  
Spiral Groove Bearing

The Spiral Groove Bearing as a Mechanism for Enhancing the Secondary Flow in a Centrifugal Rotary Blood Pump

2013 ◽  
Vol 37 (10) ◽  
pp. 866-874 ◽  
Author(s):  
Felipe Amaral ◽  
Sascha Groß-Hardt ◽  
Daniel Timms ◽  
Christina Egger ◽  
Ulrich Steinseifer ◽  
...  
Keyword(s):  
Secondary Flow ◽  
Blood Pump ◽  
Rotary Blood Pump ◽  
Spiral Groove ◽  
Spiral Groove Bearing

3637 Study of Centrifugal Blood Pump using Conical Spiral Groove Bearings

2006 ◽  
Vol 2006.2 (0) ◽  
pp. 367-368
Author(s):  
Youichi NAKAMURA ◽  
Masashi NISHIDA ◽  
Hiroshi TSUKAMOTO ◽  
Koji MIYAZAKI ◽  
Yi QIAN
Keyword(s):  
Blood Pump ◽  
Spiral Groove ◽  
Centrifugal Blood Pump

A Novel Design of Spiral Groove Bearing in a Hydrodynamically Levitated Centrifugal Rotary Blood Pump

2012 ◽  
Vol 36 (8) ◽  
pp. 739-746 ◽  
Author(s):  
Qing Han ◽  
Jun Zou ◽  
Xiaodong Ruan ◽  
Xin Fu ◽  
Huayong Yang
Keyword(s):  
Blood Pump ◽  
Rotary Blood Pump ◽  
Spiral Groove ◽  
Novel Design ◽  
Spiral Groove Bearing

1C09 Numerical analysis of spiral groove geometry in a hydrodynamically levitated centrifugal blood pump for the improvement of hemocompatibility and bearing stiffness

2013 ◽  
Vol 2013.25 (0) ◽  
pp. 95-96
Author(s):  
Tomotaka MURASHIGE ◽  
Ryo KOSAKA ◽  
Masahiro NISHIDA ◽  
Osamu MARUYAMA ◽  
Takashi YAMANE ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Blood Pump ◽  
Spiral Groove ◽  
Centrifugal Blood Pump ◽  
Bearing Stiffness
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