Embolization coil and method for manufacturing embolization coil

A manufacturing method and technology of spring coils, applied in applications, household appliances, and other household appliances, etc., can solve the problems of large differences in the magnetic susceptibility of biological tissues

Active Publication Date: 2018-10-23
TANAKA PRECIOUS METAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, there is a problem that some metal materials in the above-mentioned practical examples have a large difference in magnetic susceptibility from living tissue

Method used

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  • Embolization coil and method for manufacturing embolization coil
  • Embolization coil and method for manufacturing embolization coil
  • Embolization coil and method for manufacturing embolization coil

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Embodiment Construction

[0054] Embodiments of the present invention will be described below. In this embodiment, an Au—Pt alloy ingot having an appropriate magnetic susceptibility is manufactured, and after processing this into a wire rod as a raw material, it is processed into a two-stage coil shape to manufacture a plug coil. In this coil processing step, the coiling process is performed twice, but the shape stabilization treatment is performed in the secondary coil processing. In the present embodiment, a plurality of conditions of the form stabilization treatment are set and processed, and properties such as form stability and volume magnetic susceptibility of the manufactured coil for embolism are evaluated, and differences in the structure of the constituent materials are also evaluated. research.

[0055] Manufacture of Au-Pt Alloy Raw Materials

[0056] In this embodiment, an Au—Pt alloy having a Pt concentration of 30% by mass was produced. Pure Au and pure Pt (both with a purity of 99....

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Abstract

The present invention is an embolization coil which is composed of a wire material made from an Au-Pt alloy and has good dimensional stability, wherein the wire material that constitutes the embolization coil has such a material structure that the composition of the wire material is composed of Pt at a concentration of 24% by mass or more and less than 34% by mass and a remainder made up by Au anda Pt-rich phase is distributed in an Alpha-phase matrix, the Pt-rich phase is composed of an Au-Pt alloy having a Pt concentration that is 1.2 to 3.8 times larger than the Pt concentration in the Alpha-phase, the wire material has a volume magnetic susceptibility of -13 to -5 ppm inclusive, and the average value of at least two average crystal grain diameters measured by a linear analysis methodin the material structure of a shorter-length-direction cross section of the wire material is 0.20 to 0.35 [mu]m inclusive.

Description

technical field [0001] The present invention relates to a coil for embolization which is a kind of medical equipment and a manufacturing method thereof. In particular, it relates to a coil for embolization which has excellent shape stability and is less likely to generate artifacts in a magnetic field environment such as a magnetic resonance imaging diagnostic treatment device. Background technique [0002] Coil embolization has attracted attention in recent years as a measure to prevent rupture of cerebral aneurysms for treating cerebrovascular diseases such as subarachnoid hemorrhage. This medical treatment is a method of guiding a catheter inserted from an artery of the thigh or the like to an artery of the head and neck, thereby further inserting a microcatheter into the cerebral aneurysm, packing a coil and indwelling it. The operation of inserting and indwelling the coil into the aneurysm is repeated until the aneurysm is completely blocked. Here, as the embolization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/12A61L31/02C22C5/02C22F1/00C22F1/14
CPCA61L31/02A61B17/12C22C5/02C22F1/00C22F1/14A61L31/022C22C1/02A61B17/12113A61B17/1214B21F45/008A61L2430/36A61B2017/00526A61B2017/00836A61B2017/00964B21F3/00
Inventor 大久保道正后藤研滋
Owner TANAKA PRECIOUS METAL IND
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