Research Papers

Preliminary Design and Testing of a Cavo-Arterial Pump Utilizing Axial Magnetic Couplings

[+] Author and Article Information
John Valdovinos

Department of Electrical and
Computer Engineering,
California State University Northridge,
18111 Nordhoff Street,
Northridge, CA 91330
e-mail: john.valdovinos@csun.edu

J. Chris Bouwmeester

Institute of Biomaterials and
Biomedical Engineering,
University of Toronto,
170 College Street,
Toronto, ON M5S 3E3, Canada
e-mail: chris.bouwmeester@utoronto.ca

Pramod Bonde

Center for Advanced Heart
Failure and Transplantation,
Yale School of Medicine,
330 Cedar Street, 204 Boardman,
New Haven, CT 06520
e-mail: pramod.bonde@yale.edu

1Corresponding author.

Manuscript received May 18, 2017; final manuscript received October 5, 2017; published online November 9, 2017. Assoc. Editor: Michael Eggen.

J. Med. Devices 12(1), 011001 (Nov 09, 2017) (7 pages) Paper No: MED-17-1228; doi: 10.1115/1.4038221 History: Received May 18, 2017; Revised October 05, 2017

Right ventricular (RV) dysfunction has limited the effectiveness of mechanical circulatory support (MCS) therapy in some heart failure (HF) patients. Intravascular pumps can provide adequate circulatory support without the need for extensive operations. The development of an intravascular right ventricular assist device (RVAD), called the cavo-arterial pump (CAP), is presented. Two prototypes of the CAP were developed to demonstrate the feasibility of providing adequate pulmonary support and to demonstrate the feasibility of using axial magnetic couplings for contactless torque transmission from the motor shaft to the pump impeller. The CAP utilizing a direct drive mechanism produced a maximum pressure of 100 mm Hg and a maximum flow of 2.25 L/min when operated at 24 kRPM. When a magnetic drive mechanism was used, the overall flowrate decreased due to a loss in torque transmission. The magnetic drive CAP was able to operate up to 18.5 kRPM and produce a maximum flowrate of 1.35 L/min and a maximum pressure difference of 40 mm Hg. These results demonstrate that the CAP produces sufficient output for partial circulatory support of the pulmonary circulation, and that axial magnetic couplings can help to eliminate the sealing system needed to isolate the miniature motor and bearings from blood contact.

Copyright © 2017 by ASME
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Fig. 3

Finite element model for calculating the maximum torque transfer from the drive magnet to a following magnet separated by an air gap

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Fig. 2

(a) Exploded view of the direct drive CAP and (b) exploded view of the experimental prototype to test the magnetic couplings

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Fig. 1

Vision of the CAP for partial circulatory support to the pulmonary circulation

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Fig. 4

Schematic of the experimental setup for the (a) direct drive CAP, (b) magnetically driven CAP, and (c) a photograph of experimental setup testing the magnetically driven CAP (all components are submerged in an acrylic tank)

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Fig. 5

Calculated torque values at various offset angles for two magnetic couplings used in the CAP design

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Fig. 6

(a) Experimental motor speed versus impeller speed for the CAP utilizing magnetic couplings with water as the working fluid and (b) with blood analog (60% water and 40% glycerol) as the working fluid

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Fig. 7

(a) Experimental flowrate as a function of motor shaft speed for the CAP utilizing magnetic couplings with water as the working fluid (b) with blood analog (60% water and 40% glycerol) as the working fluid

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Fig. 8

(a) Experimental pressure–flow performance curves for the directly driven CAP and (b) the magnetically driven CAP with blood analog (60% water and 40% glycerol) as the working fluid



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