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

IF 6.1 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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引用次数: 0

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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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.