Evaluation of Hydraulic Radial Forces on the Impeller by the Volute in a Centrifugal Rotary Blood Pump

Boehning, Fiete; Timms, Daniel; Amaral, Felipe; Graefe, Roland; Hsu, Po-Lin; Schmitz‐Rode, Thomas; Steinseifer, Ulrich

doi:10.1111/j.1525-1594.2011.01312.x

Cited by 17 publications

(17 citation statements)

References 16 publications

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“…However, a transient approach has to be used for investigations of dynamic impeller motions such as whirling. Furthermore, validation of the CFD analysis should be performed with additional experiments, such as the measurement of hydraulic force exerted on the impeller [14,27,28].…”

Section: Discussionmentioning

confidence: 99%

“…Under the wide range of ow rate conditions that vary with the beating heart, a double volute would be adequate to cancel the radial hydraulic force generated by an unbalanced pressure eld around an impeller at an off-design point [12,14]. Although a double volute is effective for a centered impeller position as previously reported [12,14], its effectiveness for an eccentric impeller position in a magnetically suspended pump remains unclear. Because a passively suspended impeller may move in a double volute depending on the operating condition, investigation of the eccentric effects on the stability in a double volute pump could provide an essential design guide of the pump ow path for safer clinical use.…”

Section: Introductionmentioning

confidence: 92%

“…For the pump design, the radial passive stability can be improved with an optimal volute design by reducing the radial hydraulic force on the impeller [10][11][12][13]. Under the wide range of ow rate conditions that vary with the beating heart, a double volute would be adequate to cancel the radial hydraulic force generated by an unbalanced pressure eld around an impeller at an off-design point [12,14]. Although a double volute is effective for a centered impeller position as previously reported [12,14], its effectiveness for an eccentric impeller position in a magnetically suspended pump remains unclear.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Eccentric Impeller Position on Radial Passive Stability in a Magnetically Levitated Centrifugal Blood Pump with a Double Volute

Shida

Masuzawa

Osa

et al. 2018

ABE

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Evaluation of the impeller radial stability is important from the bioengineering point of view in the development of mechanical circulatory support devices (MCSDs) for safer use as bridge for several months or destination therapy for years. In this study, radial stability of a magnetically levitated impeller in a centrifugal blood pump with an axially magnetic suspension system was evaluated by investigating the effects of the eccentric impeller position on passive stability, aiming to propose a pump design guide for the development and safer clinical use of MCSDs. First, impeller displacements in the prototype pump were measured using a mock loop together with laser displacement sensors. Then, the radial hydraulic forces exerted on an eccentric impeller were calculated using computational uid dynamics (CFD) analysis for four volute-casing geometries. In addition, hemocompatibility was assessed using CFD calculations of scalar shear stress exerted on blood. Measurement of impeller displacement showed that the displacement varied from 0.56 to 0.27 mm at a rotational speed of 1800 rpm as the ow rate increased from 0 to 6.5 L/min. In the CFD calculation, the radial hydraulic force increased linearly from 0.2 to 1.7 N as the impeller displacement increased from 0 to 0.5 mm for all the double volute geometries, under conditions of a rotational speed of 1800 rpm and ow rates of 3, 5 and 7 L/ min. These results indicate that the impeller stability in the prototype pump is acceptable at the operation conditions of ventricular assist devices, because the magnetic bearing stiffness of radial component was 4.1 N/mm. In the pressure recovery analysis of eccentric impellers, a double volute was not effective because of the unbalanced pressure eld generated by the unbalanced pressure recovery. Thus, the increase in radial hydraulic force associated with an eccentric impeller could not be avoided by changing the conventional double volute design. The CFD analysis of geometrical variation indicated that widening of the radial clearance is an effective approach to improve the radial stability as well as hemocompatibility, although the radial clearance should be designed based on trade-offs among impeller stability, hemocompatibility and pump performance.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Eccentric Impeller Position on Radial Passive Stability in a Magnetically Levitated Centrifugal Blood Pump with a Double Volute

Shida

Masuzawa

Osa

et al. 2018

ABE

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show abstract

“…Fiete Boehning et al. (45) of the Helmholtz‐Institute for Biomedical Engineering, Aachen, Germany evaluated the hydraulic radial forces on the impeller created by the volute in an investigational centrifugal blood pump. Each volute type was tested experimentally in a centrifugal pump test setup at various RSs and flow rates.…”

Section: Cardiac Support and Blood Pumpsmentioning

confidence: 99%

Artificial Organs 2011: A Year in Review

Malchesky¹

2012

Artificial Organs

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In this Editor's Review, articles published in 2011 are organized by category and briefly summarized. As the official journal of The International Federation for Artificial Organs, The International Faculty for Artificial Organs, and the International Society for Rotary Blood Pumps, Artificial Organs continues in the original mission of its founders "to foster communications in the field of artificial organs on an international level."Artificial Organs continues to publish developments and clinical applications of artificial organ technologies in this broad and expanding field of organ replacement, recovery, and regeneration from all over the world. We take this time also to express our gratitude to our authors for offering their work to this journal. We offer our very special thanks to our reviewers who give so generously of time and expertise to review, critique, and especially provide meaningful suggestions to the author's work whether eventually accepted or rejected. Without these excellent and dedicated reviewers, the quality expected from such a journal would not be possible. We also express our special thanks to our Publisher, Wiley-Blackwell, for their expert attention and support in the production and marketing of Artificial Organs. In this Editor's Review, that historically has been widely well-received by our readership, we aim to provide a brief reflection of the currently available worldwide knowledge that is intended to advance and better human life while providing insight for continued application of technologies and methods of organ replacement, recovery, and regeneration. We look forward to recording further advances in the coming years.

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“…Results showed that a radial clearance of 10% and a tongue position at 30 degrees will generate the best performance. Boehning [38] experimentally investigated the hydraulic radial forces for three types of volute, separately design-singular, circular, and double volute. When the pump is running at a design point of 5 l/min and 2500 rpm, the single volute experienced the lowest radial force while the circular volute yielded the highest.…”

Section: Volute Profilementioning

confidence: 99%

Effects of geometrical parameters on performance of miniature centrifugal pump

Liu¹

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In the first place, I would like to express my deepest sense of gratitude to my supervisor, Professor Chan Weng Kong, who was abundantly helpful and offered invaluable assistance, advice, and guidance throughout the work in every step of my research. His sharp sight, patient explanation and continuous encouragement have enlightened me to a more profound and extensive academic future. I would like to thank CNC technician Mr. Kong Seng Ann, Fluid Mechanics Lab technician Mr. Yap Pow Kim and Thermal Fluid Research Lab 1 technician Mr. Yuen Kee Hock for helping me on milling impellers and volutes for my experimental research. Besides, I appreciate all staffs and students in Thermal and Fluid Research Lab for their suggestions and helps. Last but not least, I take this opportunity to express my appreciation to my beloved families. My parents and husband deserve special mention for their inseparable support and endless love through the duration of my studies.

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Evaluation of Hydraulic Radial Forces on the Impeller by the Volute in a Centrifugal Rotary Blood Pump

Cited by 17 publications

References 16 publications

Effects of Eccentric Impeller Position on Radial Passive Stability in a Magnetically Levitated Centrifugal Blood Pump with a Double Volute

Effects of Eccentric Impeller Position on Radial Passive Stability in a Magnetically Levitated Centrifugal Blood Pump with a Double Volute

Artificial Organs 2011: A Year in Review

Effects of geometrical parameters on performance of miniature centrifugal pump

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