title: Introductory tests to in vivo evaluation: magnetic coupling influence in motor controller.
abstract: An implantable centrifugal blood pump has been developed with original features for a ventricle assist device (VAD). This pump is part of a multicenter and international study with objective to offer simple, affordable, and reliable devices to developing countries. Previous computational fluid dynamics investigations were performed followed by prototyping and in vitro tests. Also, previous blood tests for assessment of hemolysis showed mean normalized index of hemolysis (NIH) results of 0.0054 ± 2.46 × 10⁻³ mg/100 L (at 5 L/min and 100 mm Hg). To precede in vivo evaluation, measurements of magnetic coupling interference and enhancements of actuator control were necessary. Methodology was based on the study of two different work situations (1 and 2) studied with two different types of motors (A and B). Situation 1 is when the rotor of pump is closest to the motor and situation 2 its opposite. Torque and mechanical power were collected with a dynamometer (80 g/cm) and then plotted and compared for two situations and both motors. The results showed that motor A has better mechanical behavior and less influence of coupling. Results for situation 1 showed that it is more often under magnetic coupling influence than situation 2. The studies lead to the conclusion that motor A is the best option for in vivo studies as it has less influence of magnetic coupling in both situations.
authors.affiliation: Institute Dante Pazzanese of Cardiology, Sao Paulo, Brazil; †Unicamp, Sao Paulo, Brazil. eduardo_bock@yahoo.com.br
authors.forename: Eduardo
authors.initials: E
authors.lastname: Bock
authors.forename: Aron
authors.initials: A
authors.lastname: Andrade
authors.forename: Jarbas
authors.initials: J
authors.lastname: Dinkhuysen
authors.forename: Celso
authors.initials: C
authors.lastname: Arruda
authors.forename: Jeison
authors.initials: J
authors.lastname: Fonseca
authors.forename: Juliana
authors.initials: J
authors.lastname: Leme
authors.forename: Bruno
authors.initials: B
authors.lastname: Utiyama
authors.forename: Tarcisio
authors.initials: T
authors.lastname: Leao
authors.forename: Beatriz
authors.initials: B
authors.lastname: Uebelhart
authors.forename: Pedro
authors.initials: P
authors.lastname: Antunes
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Sugita
authors.forename: Tadashi
authors.initials: T
authors.lastname: Motomura
authors.forename: Yukihiko
authors.initials: Y
authors.lastname: Nosé
mesh_terms: D001698:Biomedical Engineering / Q000379:methods; D002498:Centrifugation; D004867:Equipment Design; D006353:Heart-Assist Devices; D006461:Hemolysis; D006801:Humans; D008280:Magnetics; D019415:Torque