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Development of a prototype magnetically suspended rotor ventricular assist device
G B Bearnson1, E H Maslen, D B Olsen
1University of Utah Artificial Heart Research Laboratory, Salt Lake City 84103, USA.
ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|July 1, 1996
Summary
This study presents a novel magnetically suspended centrifugal blood pump. Promising in vitro results suggest its potential for long-term implantable applications.
Area of Science:
- Biomedical Engineering
- Mechanical Engineering
- Fluid Dynamics
Background:
- Continuous flow blood pumps are crucial for treating heart failure.
- Existing designs face challenges with durability and biocompatibility.
- Magnetic suspension offers a potential solution for reduced wear and improved longevity.
Purpose of the Study:
- To design, construct, and test a continuous flow centrifugal blood pump utilizing magnetic suspension.
- To evaluate the pump's performance, hydraulic efficiency, and biocompatibility.
- To assess the feasibility of magnetic bearings for long-term implantable blood pump applications.
Main Methods:
- A Francis vane type centrifugal pump was designed with a target operating point of 6 L/min flow and 100 mmHg pressure rise.
- An all-active magnetic bearing system with five axes of control and rotor position sensors was developed.
- A sensorless brushless DC motor using back electromotive force for commutation was employed, featuring a slotless design.
Main Results:
- The centrifugal pump achieved a peak hydraulic efficiency exceeding 50%.
- In vitro testing with blood demonstrated a low index of hemolysis (0.0086 +/- 0.0012).
- The magnetic bearing system provided stable rotor suspension.
Conclusions:
- The magnetically suspended centrifugal blood pump concept is promising for long-term implantable devices.
- Further design optimization is required to reduce power consumption and device size.
- The developed system shows potential for advancing blood pump technology.