Pulsatile driving of the helical flow pump

Ishii, Kohei; Hosoda, Kyohei; Igarashi, Takashi; Saito, Itsuro; Ariyoshi, Koki; Inoue, Yusuke; Sato, Masami; Hara, Sintaro; Lee, Xinyang; Sheng-yuan, WU; Ono, Takahiro; Nakagawa, Hidemoto; Imachi, Kou; Abe, Yusuke

doi:10.1109/embc.2013.6610103

Cited by 3 publications

(3 citation statements)

References 13 publications

(14 reference statements)

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“…The results indicated that the HFP has a novel and quite unique working principle. Reported favorable features of the HFP, such as high performance with low rotational speed [8], a good antithrombogenic property [8] and great pulsatility [9] are the advantages of this working principle.…”

Section: Discussionmentioning

confidence: 98%

“…Considering that the kinetic viscosity of 64 wt% NaI solution and blood is 1.6e-6 and 3.0e-6 m/s 2 , respectably, rotational speed should be set at 0.6 times of that with blood to adjust Reynolds number. The target condition was decided 5 L/min in flow rate against 100 mmHg pressure head, which was obtained with 1400 rpm rotational speed when kinetic viscosity of working fluid was the same as blood [9]. Thus, rotational speed in the flow visualization study was set at 840 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…The helical flow pump (HFP) was invented to be an ideal pump for developing the TAH [8]. The HFP has inlet and outlet ports at the same radial side and can generate the complete pulsatile flow in the range of heart rate from 60 to 120 BPM [9]. To date, the helical flow TAH (HFTAH) using two HFPs has being developed [10].…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic characteristics of the helical flow pump

et al. 2015

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The helical flow pump (HFP) was invented to be an ideal pump for developing the TAH and the helical flow TAH (HFTAH) using two HFPs has been developed. However, since the HFP is quite a new pump, hydrodynamic characteristics inside the pump are not clarified. To analyze hydrodynamic characteristics of the HFP, flow visualization study using the particle image velocimetry and computational fluid dynamics analysis were performed. The experimental and computational models were developed to simulate the left HFP of the HFTAH and distributions of flow velocity vectors, shear stress and pressure inside the pump were examined. In distribution of flow velocity vectors, the vortexes in the vane were observed, which indicated that the HFP has a novel and quite unique working principle in which centrifugal force rotates the fluid in the helical volutes and the fluid is transferred from the inlet to the outlet helical volutes according to the helical structure. In distribution of shear stress, the highest shear stress that was considered to be occurred by the shunt flow across the impeller was found around the entrance of the inlet helical volute. However, it was not so high to cause hemolysis. This shunt flow is thought to be improved by redesigning the inlet and outlet helical volutes. In distribution of pressure, negative pressure was found near the entrance of the inlet helical volute. However, it was not high. Negative pressure is thought to be reduced with an improvement in the design of the impeller or the vane shape.

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Section: Discussionmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

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Hydrodynamic characteristics of the helical flow pump

et al. 2015

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Machinability and Optimization of Shrouded Centrifugal Impellers for Implantable Blood Pumps

Paul

Rezaienia

Avital

et al. 2017

Journal of Medical Devices

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This paper describes the use of analytical methods to determine machinable centrifugal impeller geometries and the use of computational fluid dynamics (CFD) for predicting the impeller performance. An analytical scheme is described to determine the machinable geometries for a shrouded centrifugal impeller with blades composed of equiangular spirals. The scheme is used to determine the maximum machinable blade angles for impellers with three to nine blades in a case study. Computational fluid dynamics is then used to analyze all the machinable geometries and determine the optimal blade number and angle based on measures of efficiency and rotor speed. The effect of tip width on rotor speed and efficiency is also examined. It is found that, for our case study, a six- or seven-bladed impeller with a low blade angle provides maximum efficiency and minimum rotor speed.

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A Review of Innovative Electromagnetic Technologies for a Totally Artificial Heart

2023

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A total artificial heart (TAH) represents a challenge in medical science to provide a survival perspective for patients with severe cardiac problems. Although cardiac transplantation represents the optimal therapeutic solution for end-stage heart failure, its application is limited by organ shortages. However, innovative technologies that can fit the operation and constraints of a physical heart are now under experimentation, making the target of a reliable and minimally invasive TAH much closer. The electromagnetic devices involved in system supply and actuation could potentially improve patient quality of life and expectancy. The purpose of this paper is to provide an overview of the operating principle, ratings, and key performance of the main electromagnetic components, with a particular focus on actuators that emulate the pumping effect of the heart ventricles. Linear oscillating actuators are very promising for their compactness and straightforward integration; therefore, an exhaustive overview considering both the single and the dual-mover configurations is worth being carried out. Taking a cue on the projects under development and after a detailed literature investigation, the pros and cons of the different solutions are discussed with the purpose of providing a critical analysis of the state-of-the-art.

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Pulsatile driving of the helical flow pump

Cited by 3 publications

References 13 publications

Hydrodynamic characteristics of the helical flow pump

Hydrodynamic characteristics of the helical flow pump

Machinability and Optimization of Shrouded Centrifugal Impellers for Implantable Blood Pumps

A Review of Innovative Electromagnetic Technologies for a Totally Artificial Heart

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