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Published on: August 2, 2016
Introductory tests to in vivo evaluation: magnetic coupling influence in motor controller
Eduardo Bock1, Aron Andrade, Jarbas Dinkhuysen
1Institute Dante Pazzanese of Cardiology, Sao Paulo, Brazil; †Unicamp, Sao Paulo, Brazil. eduardo_bock@yahoo.com.br
ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|August 16, 2011
Summary
This study evaluated a new implantable blood pump for ventricle assist devices (VADs), focusing on motor performance and magnetic coupling. Motor A demonstrated superior mechanical behavior and reduced magnetic interference, making it ideal for upcoming in vivo testing.
Area of Science:
- Biomedical Engineering
- Medical Devices
- Cardiovascular Engineering
Background:
- Development of an implantable centrifugal blood pump for ventricle assist devices (VADs).
- Part of an international initiative to provide simple, affordable, and reliable VADs for developing nations.
- Previous studies included computational fluid dynamics, prototyping, in vitro tests, and hemolysis assessments (NIH: 0.0054 ± 2.46 × 10⁻³ mg/100 L at 5 L/min).
Purpose of the Study:
- To evaluate magnetic coupling interference and actuator control enhancements for in vivo VAD assessment.
- To compare the mechanical performance of two different motor types (A and B) under varying operational conditions.
Main Methods:
- Investigated two work situations: rotor closest to the motor (Situation 1) and rotor farthest (Situation 2).
- Utilized a dynamometer to measure torque and mechanical power for both motors (A and B) in both situations.
- Compared motor performance based on magnetic coupling influence and mechanical behavior.
Main Results:
- Motor A exhibited better mechanical behavior and less susceptibility to magnetic coupling interference compared to Motor B.
- Situation 1 (rotor closest to motor) showed a greater influence of magnetic coupling than Situation 2.
- Motor A was identified as the preferred choice for in vivo studies due to its consistent performance across both situations.
Conclusions:
- Motor A is the optimal selection for the implantable blood pump's in vivo evaluation.
- Minimizing magnetic coupling interference is crucial for reliable VAD actuator control.
- The developed VAD shows promise for improving cardiac support in resource-limited settings.
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