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KMID : 0372919980190040333
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Journal of Biomedical Engineering Research
1998 Volume.19 No. 4 p.333 ~ p.339
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Effect of Heat Treatment on Properties of Tungsten Embolization Coils
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Son Ung-Hui
Park Jea-Hyung
Hong Sun-Hyeong
Shin Gyeong-Min
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Abstract
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The effect of heat treatment conditions on the properties of tungsten(W) embolization coils has been evaluated. The W embolization coils were fabricated by coiling the primary W coil with a diameter of 30.mm on a alumina rod mandrel with a diameter of 2.92mm. The secondary coils were then heat treated at 475and 600 for various heat treatment time ranging from 5 minutes to 36hours. The pitch distance, diameter and shape retention capability of the W embolization coils were characterized after the heat treatment. The pitch distance of the W embolization coils increased with the heat treatment time. The diameter of W emboliazation coils decreased continuously with heat treatment time. The shape retention capability of the W embolization coils increased with the heat treatment time due to an increase in elasticity by formation of tungsten oxide film on W coil surface during the heat treatment. The heat treatment condition of W embolization Col at 600 for 20 minute was considered desirable based on the optimization of the shape retention capability, pitch distance and secondary coil diameter after heat treatment.
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KEYWORD
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Embolization coil, Heat treatment, Pitch distance, Shape retention capability, Oxide film
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