Artificial hearts—recent progress: republication of the article published in the Japanese Journal of Artificial Organs

Nishida, Masahiro

doi:10.1007/s10047-017-0969-2

Cited by 4 publications

(6 citation statements)

References 65 publications

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“…The magnetic levitation as a noncontact bearing is one of the best options for rotational blood pumps; however, it may be technically impractical to develop a magnetic levitation bearing for small axial VADs. The miniature RIAFBP employs ceramics and fin bearings belonging to a second‐generation blood pump, such as the HeartMate 2 and Jarvik 2000 . Further improvement of the bearings is required for long‐term endurance and to prevent thrombus formation.…”

Section: Discussionmentioning

confidence: 99%

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Development of rear‐impeller axial flow blood pump for realization of axial flow blood pump installed at aortic valve position

et al. 2019

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In this study, rear‐impeller axial flow blood pumps (RIAFBP) were developed to realize a trans‐valve axial ventricular assist device (VAD) which consists of the latter blood pump and a polymer monomembrane aortic valve, such as the jellyfish valve. The motor of the RIAFBP is installed in the left ventricle, and its impeller is placed at the aortic valve position. In the prototype RIAFBP, the rotation of the motor is sustained by polyethylene bushings. The RIAFBP has a length of 50 mm and diameter of 19.6 mm. The miniature RIAFBP has the same construction as that of the prototype; however, it employs a ceramic bearing and fin bearing to improve endurance and to reduce blood stagnation. The miniature RIAFBP has a length of 63 mm and diameter of 12 mm. Both RIAFBPs were examined by an in vitro experiment using a 33% glycerin solution. The prototype RIAFBP achieved a maximum pump outflow of 8.5 L/min against a pump head of 100 mm Hg at a rotational speed of 12 000 rpm. The miniature RIAFBP achieved 7 L/min against a pump head of 70 mm Hg at a rotational speed of 21 600 rpm. In conclusion, the miniature RIAFBP has enough pump performance to realize the trans‐valve axial VAD.

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Section: Discussionmentioning

confidence: 99%

“…The miniature RIAFBP employs ceramics and fin bearings belonging to a secondgeneration blood pump, such as the HeartMate 2 and Jarvik 2000. 18 Further improvement of the bearings is required for long-term endurance and to prevent thrombus formation. However, these bearings could sustain the rotational motion in the miniature RIAFBP.…”

Section: Discussionmentioning

confidence: 99%

Development of rear‐impeller axial flow blood pump for realization of axial flow blood pump installed at aortic valve position

et al. 2019

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“…The EXCOR Pediatric is also approved in the USA (FDA approval 2011) [20]. In Japan, the first EXCOR Pediatric 2012 was used on a 14-month-old infant, and the system has been approved since 2015 [21]. Until 2012, the longest period of use was 877 days for a 6-year-old child [22].…”

Section: Thoratec Pvad Thoratec Corporation Pleasanton Usamentioning

confidence: 99%

Review and reflections about pulsatile ventricular assist devices from history to future: concerning safety and low haemolysis—still needed

Köhne

2020

J Artif Organs

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Since the first use of a ventricular assist device in 1963 many extracorporeal and implantable pulsatile blood pumps have been developed. After the invention of continuous flow blood pumps the implantable pulsatile pumps are not available anymore. The new rotary pumps spend a better quality of life because many of the patients can go home. Nevertheless, the extracorporeal pulsatile pumps have some advantages. They are low-cost systems, produce less haemolysis and heart-recovery can be tested easily. Pump failure is easy to realize because the pumps can be observed visually. Pump exchange can be done easily without any chirurgic surgery. As volume displacement pumps they can produce high blood pressure, so they are the only ones suitable for pediatric patients. Therefore, they are indispensable for clinical use today and in the future. In this work, nearly all pulsatile blood pumps used in clinical life are described.

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“…However, magnetic bearings need sensors and control system to guarantee the suspension, which increases the complexity of the implanted device. Thus, hydrodynamic bearings, which offer suspension force depending on its hydraulic characteristics, were widely studied for RBPs [3–5].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Pulsatile Flow on Suspension Force for Hydrodynamically Levitated Blood Pump

Huang

et al. 2019

Journal of Healthcare Engineering

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Hydrodynamically levitated rotary blood pumps (RBPs) with noncontact bearing are effective to enhance the blood compatibility. The spiral groove bearing (SGB) is one of the key components which offer the suspension force to the RBP. Current studies focus on the suspension performance of the SGB under continuous flow condition. However, the RBP shows pulsatile characteristics in the actual clinical application, which may affect the suspension performance of the SGB. In this paper, the impact of pulsatile flow upon the suspension force from the SGB is studied. A model of the SGB with a groove formed of wedge-shaped spirals is built. Then, the CFD calculation of the hydrodynamic force offered by designed SGB under simulated pulsatile flow is introduced to obtain the pulsatile performance of the suspension force. The proposed method was validated by experiments measuring the hydrodynamic force with different bearing gaps. The results show that the suspension force of the SGB under pulsate flow is the same as under steady flow with equivalent effective pressure. This paper provides a method for suspension performance test of the SGB.

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Artificial hearts—recent progress: republication of the article published in the Japanese Journal of Artificial Organs

Abstract: This review was created based on a translation of the Japanese review written in the Japanese Journal of Artificial Organs in 2015 (Vol.44, No. 3, pp.130-135), with some modifications regarding several references published in 2015 or later.

Cited by 4 publications

References 65 publications

Development of rear‐impeller axial flow blood pump for realization of axial flow blood pump installed at aortic valve position

Development of rear‐impeller axial flow blood pump for realization of axial flow blood pump installed at aortic valve position

Review and reflections about pulsatile ventricular assist devices from history to future: concerning safety and low haemolysis—still needed

The Impact of Pulsatile Flow on Suspension Force for Hydrodynamically Levitated Blood Pump

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