Dujovny M, Kossovsky N, Kossowsky R, Segal R, Diaz F G, Kaufman H, Perlin A, Cook E E
Neurosurgery. 1985 Nov;17(5):760-7. doi: 10.1227/00006123-198511000-00006.
The mechanical and metallurgical properties of carotid artery clamps were evaluated. The pressure plate retreat propensity, metallurgical composition, surface morphology, magnetic properties, and corrosion resistance of the Crutchfield, Selverstone, Salibi, and Kindt clamps were tested. None of the clamps showed evidence of pressure plate retreat. The clamps differed significantly in their composition, surface cleanliness, magnetic properties, and corrosion resistance. The Crutchfield clamp was the only one manufactured from an ASTM-ANSI-approved implantable stainless steel (AISI 316) and the only clamp in which the surfaces were clean and free of debris. The Selverstone clamp was made principally from AISI 304 stainless steel, as was one Salibi clamp. The pressure plate on another Salibi clamp was made from a 1% chromium and 1% manganese steel. Machining and surface debris consisting principally of aluminum, silicon, and sulfur was abundant on the Selverstone and Salibi clamps. The Kindt clamp was manufactured from AISI 301 stainless steel with a silicate-aluminized outer coating. The Crutchfield and Selverstone clamps were essentially nonferromagnetic, whereas the Salibi and Kindt clamps were sensitive to magnetic flux. In the pitting potential corrosion test, the Crutchfield clamp demonstrated good corrosion resistance with a pitting potential of 310 mV and no surface corrosion or pitting by scanning electron microscopy examination. The Selverstone clamp had lower pitting potentials and showed various degrees of corrosion and surface pitting by scanning electron microscopy. The Salibi pressure plate had a very low pitting potential of -525 mV and showed severe corrosion. By metallurgical criteria, only the Crutchfield clamp is suitable for long term implantation.
对颈动脉夹的机械性能和冶金性能进行了评估。测试了Crutchfield夹、Selverstone夹、Salibi夹和Kindt夹的压板回缩倾向、冶金成分、表面形态、磁性和耐腐蚀性。没有一个夹子显示出压板回缩的迹象。这些夹子在成分、表面清洁度、磁性和耐腐蚀性方面有显著差异。Crutchfield夹是唯一由ASTM-ANSI批准的可植入不锈钢（AISI 316）制造的夹子，也是表面清洁且无碎屑的唯一夹子。Selverstone夹主要由AISI 304不锈钢制成，一个Salibi夹也是如此。另一个Salibi夹的压板由1%铬和1%锰钢制成。Selverstone夹和Salibi夹上有大量主要由铝、硅和硫组成的加工碎屑和表面碎屑。Kindt夹由带有硅铝涂层的AISI 301不锈钢制成。Crutchfield夹和Selverstone夹基本无磁性，而Salibi夹和Kindt夹对磁通量敏感。在点蚀电位腐蚀试验中，Crutchfield夹表现出良好的耐腐蚀性，点蚀电位为310 mV，通过扫描电子显微镜检查没有表面腐蚀或点蚀。Selverstone夹的点蚀电位较低，通过扫描电子显微镜显示出不同程度的腐蚀和表面点蚀。Salibi夹的压板点蚀电位非常低，为-525 mV，显示出严重腐蚀。根据冶金标准，只有Crutchfield夹适合长期植入。
