Tanaka Kikinzoku Kogyo K.k.

Akira Inoue

Takeyuki Sagae

Michimasa Okubo

Yuki Horinouchi

Mizuki Nihei

The present invention relates to a medical Pt&#x2014;W alloy, containing 10 mass % or more and 15 mass % or less of W, with the balance being Pt and inevitable impurities, in which a Zr content is 1000 ppm or less. Limiting the Zr content can improve workability, particularly workability at the stage of hot working. Regarding impurity control, further limiting a Ca content to 250 ppm or less can provide more suitable workability. The present invention is good in workability in processing into a wire included in an embolic coil, a guide wire or the like.

Medical Pt-W alloy

The present invention is drawn to a medical Pt alloy wire, made of a Pt&#x2014;W alloy containing 10% by mass or more and 15% by mass or less of W, a balance of Pt, and inevitable impurities. The Pt alloy wire has Vickers hardness of 400 Hv or more and 600 Hv or less, and has hardness and strength superior to those of a conventional Pt alloy wire having the same composition. The Pt alloy wire of the present invention has properties preferable as a coil applied to an embolic coil or a guide wire or the like, and is also good in workability in secondary processing for producing such a medical tool.

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Isehara, Japan

Akira Inoue