INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Electrochemical study of several biomaterials used as cardiovascular stents
Autor/es:
LUCILA NAVARRO; GUSTAVO DUFFÓ; JULIO LUNA; IGNACIO RINTOUL
Lugar:
Santa Fe
Reunión:
Congreso; 14° SAM-CONAMET XIII IBEROMAT XIII Simposio MATERIA; 2014
Institución organizadora:
Asociación Argentina de Materiales (SAM) y la Universidad Nacional del Litoral
Resumen:
P { margin-bottom: 0.21cm; }
Cardiovascular stents are made of
metal alloys and they are in contact with a corrosive biological
environment. The corrosion may promote loss of material, subsequent
fracture for the implant and the release of metallic ions that may
induce platelet adhesion, hypersensitivity reactions and recurrent
restenosis. Several coatings and metal alloys have been developed to
improve this situation. Methodology: The corrosion resistance of
commercial stents was evaluated using potentiometry technique. 316L
stainless steel (naked, gold coated, graphite coated and with a
surface treatment developed in our lab) and of Cr-Co alloy were
tested. The resting potential as a function of time under open
circuit and the corresponding polarimetric curve were determined.
Micrographs were taken to follow the process. Results: The obtained
curves, show that the anodic current density of the gold and graphite
coated and surface treated stents are much lower than the anodic
current density of naked stents. The Cr-Co stents, also presented a
good behaviour, with low corrosion rates and a clear tendency to
intergranular corrosion. The naked stainless steel showed the worse
behaviour with pitting and mass loss. Conclusion: the coating and the
surface treatment of stainless steel greatly improve the corrosion
resistance of stainless steel stents y a biological environment, such
improvement allows them to commercially compete against other
materials like Cr-Co alloys.
P { margin-bottom: 0.21cm; }Cardiovascular stents are made of
metal alloys and they are in contact with a corrosive biological
environment. The corrosion may promote loss of material, subsequent
fracture for the implant and the release of metallic ions that may
induce platelet adhesion, hypersensitivity reactions and recurrent
restenosis. Several coatings and metal alloys have been developed to
improve this situation. Methodology: The corrosion resistance of
commercial stents was evaluated using potentiometry technique. 316L
stainless steel (naked, gold coated, graphite coated and with a
surface treatment developed in our lab) and of Cr-Co alloy were
tested. The resting potential as a function of time under open
circuit and the corresponding polarimetric curve were determined.
Micrographs were taken to follow the process. Results: The obtained
curves, show that the anodic current density of the gold and graphite
coated and surface treated stents are much lower than the anodic
current density of naked stents. The Cr-Co stents, also presented a
good behaviour, with low corrosion rates and a clear tendency to
intergranular corrosion. The naked stainless steel showed the worse
behaviour with pitting and mass loss. Conclusion: the coating and the
surface treatment of stainless steel greatly improve the corrosion
resistance of stainless steel stents y a biological environment, such
improvement allows them to commercially compete against other
materials like Cr-Co alloys.