Tribology and Crystallinity in pivot bearings of Ventricular Assist Devices
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Tipo de produção
Artigo
Data
2020-03-05
Autores
MARQUIORI, D. S.
FLORENTINO, P. C.
ARAKI, S. Y.
FUJITA, I. K.
BASSO, R.
BABETTO, A.
MORO, J.
Baltus Cornelius Bonse
LEÃO, T. F.
ANDRADE, A. J. P.
BOCK, E. G. P.
FLORENTINO, P. C.
ARAKI, S. Y.
FUJITA, I. K.
BASSO, R.
BABETTO, A.
MORO, J.
Baltus Cornelius Bonse
LEÃO, T. F.
ANDRADE, A. J. P.
BOCK, E. G. P.
Orientador
Periódico
The Academic Society Journal
Título da Revista
ISSN da Revista
Título de Volume
Citação
MARQUIORI, D. S.; FLORENTINO, P. C.; ARAKI, S. Y.; FUJITA, I. K.; BASSO, R.; BABETTO, A.; MORO, J.; BONSE, B. C.; LEÃO, T. F.; ANDRADE, A. J. P.; BOCK, E. G. P. Tribology and crystallinity in pivot bearings of ventricular assist devices. The Academic Society Journal, v. 4, n. 1, p. 52-62, Marc. 2020.
Texto completo (DOI)
Palavras-chave
VAD,X-Ray Diffraction,infrared spectroscopy,crystallinity,CARoL Pump,polymeric bearings
Resumo
Ventricular Assist Devices are blood pumps used in patients with Congestive Heart
Failure who are waiting for a heart transplant. They aim to assist the ventricle to pump out blood
in physiological circulation by increasing aortic pressure and decreasing intraventricular
pressure. The IFSP Laboratory of Bioengineering and Biomaterials (BIOENG) has been
developing an Implantable Centrifugal Blood Pump called CARoL for mechanical circulatory
support. The objective of this dissertation is to evaluate the changes in the crystallinity of the
polymeric Pivot Bearings supporting the impeller of this pump when subjected to friction
generated by rotation of zirconia oxide ceramic shafts. The adopted methodology consisted of
submitting new and used samples of: a) bearings set made of polyamide 6; and b) the set made of
poly-ether-ether-ketone. Those new and used samples were characterized by X-ray diffraction
tests and Infrared Spectroscopy. The diffractograms and spectra obtained were compared to
evaluate the bearing crystallinity, for both polymers before and after friction. The tests carried
out showed diffractograms and similar spectra for the new and used samples, thus, there are
indications that the friction generated by the rotation of the shafts did not change the crystallinity
of the polymeric bearings supporting the pump rotor.