Co-Cr-W-Pt alloys with high X-ray visibility for next-generation balloon-expandable stents

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2025-03-17 DOI:10.1016/j.msea.2025.148216

Tomoki Nakajima , Yuri Ito , Kosuke Ueki , Tomokazu Numano , Kyosuke Ueda , Takayuki Narushima

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Abstract

Balloon-expandable stents are deployed using radiography, necessitating materials with high X-ray visibility, excellent corrosion resistance, high strength and ductility, and low yield stress. In this study, we designed and developed Co-Cr-W-Pt alloys by replacing Ni with Pt in a Co-Cr-W-Ni (ASTM F90, L605) alloy, which is used for practical balloon-expandable stents, with the aim of achieving both high X-ray visibility and excellent mechanical properties. The brightness of the developed alloys, which was evaluated using an X-ray television system, decreased with an increase in the Pt content, indicating that Pt addition improved X-ray visibility. The developed Co-Cr-W-Pt alloys with grain sizes of 25–48 μm exhibited ductility similar to that of conventional Pt-Cr steel and ultimate tensile strength higher than that of Pt-Cr steel. Anodic-polarization tests revealed that the corrosion resistance of the Co-Cr-W-Pt alloys was comparable to that of the L605 alloy. The elution of metal ions in the simulated body fluid was decreased to an acceptable level, and the developed alloys exhibited lower magnetic susceptibility than the L605 alloy. The Co-Cr-W-Pt alloys with high X-ray visibility, excellent mechanical properties, high corrosion resistance, and low magnetic susceptibility are suitable materials for next-generation balloon-expandable stents.

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具有高x射线可见度的Co-Cr-W-Pt合金，用于下一代气球膨胀支架

气球膨胀支架采用x射线成像技术，因此材料必须具有高x射线可视性、优异的耐腐蚀性、高强度和延展性以及低屈服应力。在本研究中，我们设计并开发了Co-Cr-W-Pt合金，将Co-Cr-W-Ni （ASTM F90, L605）合金中的Ni替换为Pt，用于实际的气球膨胀支架，目的是实现高x射线可见性和优异的机械性能。利用x射线电视系统对合金的亮度进行了评价，发现随着Pt含量的增加，合金的亮度有所下降，这表明Pt的加入提高了合金的x射线可见度。制备的Co-Cr-W-Pt合金的晶粒尺寸为25 ~ 48 μm，其延展性与传统的Pt-Cr钢相似，极限抗拉强度高于Pt-Cr钢。阳极极化试验表明，Co-Cr-W-Pt合金的耐蚀性与L605合金相当。模拟体液中金属离子的洗脱降低到可接受的水平，所开发的合金的磁化率低于L605合金。Co-Cr-W-Pt合金具有高x射线可视性、优异的机械性能、高耐腐蚀性和低磁化率，是下一代气球膨胀支架的合适材料。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.