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Seven surgical aneurysm clips, representing six stainless steels and one cobalt-based alloy, were subjected to a complete metallurgical characterization. The studies involved microstructural analysis, hardness measurements, X-ray diffraction analysis, and measurements of the galvanic passivation and resistance to pitting corrosion. Furthermore, one type of clip was subjected to a rigorous failure analysis. The results will be presented in terms of a comparative evaluation. The clinical significance of in vitro galvanic corrosion measurements will be supported by the discussion of the reasons for several failures of one type of aneurysm clip.
aneurysm, corrosion, galvanic activity, implant materials, stress corrosion cracking, metallurgy, vascular surgery, X-ray diffraction, biological degradation, fatigue (materials)
Manager, Center for Materials Characterization, Westinghouse Research and Development Center, Pittsburgh, PA
Intern, The New York Hospital-Cornell University Medical Center, New York, NY
Staff member, Department of Neurosurgery, Henry Ford Hospital, Detroit, MI